CN110346707B - DC circuit breaker closed loop on-off sub-module test method - Google Patents
DC circuit breaker closed loop on-off sub-module test methodInfo
- Publication number
- CN110346707B CN110346707B CN201910491699.9A CN201910491699A CN110346707B CN 110346707 B CN110346707 B CN 110346707B CN 201910491699 A CN201910491699 A CN 201910491699A CN 110346707 B CN110346707 B CN 110346707B
- Authority
- CN
- China
- Prior art keywords
- test
- current
- breaker
- module
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
A DC circuit breaker closed loop on-off submodule test method. The invention firstly receives a user instruction, and then outputs control signals to the test circuit and the communication interfaces DBC & VBC according to the corresponding user instruction, and drives the test circuit to output various signals so as to trigger a main branch or a transfer branch sub-module of the direct current circuit breaker to be tested. The main branch or the transfer branch sub-module of the triggered direct current breaker outputs corresponding voltage or current signals, and the test controller obtains the signals through the test circuit to analyze, so that the state of the direct current breaker is judged. The test equipment is simple and feasible, is convenient to operate, can test the full-bridge module and the mechanical switch, and has wide application scene.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a closed-loop on-off sub-module test technology of a direct current breaker.
Background
Direct current fault protection is a technical bottleneck faced by direct current power grid construction, and in order to realize direct current fault protection, a direct current breaker is generally required to realize flexible direct current power grid control protection.
However, the existing direct current circuit breaker does not have a detection technology matched with the existing direct current circuit breaker, and whether the running state of each circuit element in the existing direct current circuit breaker is normal cannot be determined. In addition, in the process of engineering development and engineering application of the direct current breaker, a closed-loop on-off sub-module test of the breaker also needs to be developed. The test has no technical basis and industry standard which can be referred.
The test of the on-off submodule of the direct current breaker is considered to be a test which is required to be carried out along with the regulation of the whole process needle from the development to the manufacture and the delivery of the direct current breaker, and is also a test which is relied on for regular maintenance in the operation of a direct current power grid. The report or record of the closed-loop on-off sub-module test of the direct-current circuit breaker is also important information of the need of tracking in the product development, manufacture and delivery management. Therefore, a way is needed to test the working state of the closed-loop on-off sub-module of the direct current breaker and the functions, performances and the like of key parts of the test.
Disclosure of Invention
The invention provides a DC circuit breaker closed-loop on-off sub-module test method aiming at the defects of the prior art, according to the invention, the state of the direct current breaker can be accurately obtained through analyzing the voltage signal and the current signal generated by responding to the opening command, the closing command or the test trigger excitation signal to the main branch or the transfer branch submodule of the direct current breaker. The invention adopts the following technical scheme.
Firstly, in order to achieve the aim, a test method of a closed-loop on-off submodule of a direct-current circuit breaker is provided, wherein the test method comprises the steps of firstly, receiving a command of a user, outputting a control signal to a test circuit and a communication interface DBC & VBC according to the command, wherein the command of the user comprises a test starting time signal, a test category mark, a test parameter, a test progress signal, a test result signal and a trigger emergency protection signal, secondly, outputting an opening command or a closing command to a mechanical switch in the direct-current circuit breaker according to the control signal output by a test controller by the communication interface DBC & VBC, sending an opening-off control signal to the integrated drive, thirdly, outputting a test trigger excitation signal according to the opening-off control signal output by the communication interface DBC & VBC, triggering all circuit elements in a main branch or a transfer submodule of the direct-current circuit breaker, fourthly, responding to the opening command or the transfer command by all circuit elements in the main branch or the transfer submodule of the direct-current circuit breaker, calculating the state of the direct-current circuit breaker or the transfer submodule of the direct-current circuit breaker by the test circuit, and the equivalent state of the direct-current circuit breaker by the test circuit breaker or the transfer submodule, and the test data of the test circuit, and the equivalent state of the test circuit is calculated by the test circuit, and the equivalent state of the test circuit signals is output by the test and the test circuit state of the test circuit, judging whether a circuit element in a main branch or a transfer branch sub-module of the direct current circuit breaker fails.
Optionally, the test method for the closed-loop on/off sub-module of the direct current circuit breaker further comprises the following steps that the test controller receives data detected and output by the test circuit, judges that a switching element in a main branch or a transfer branch sub-module of the direct current circuit breaker meets the conditions that loop current is reduced and voltage is increased when the direct current circuit breaker is not on, voltage is reduced to 0 when the direct current circuit breaker is on, current is increased, current is gradually reduced to be close to 0 when the switching element is off, and voltage is continuously increased, and further carries out Rogowski coil current test when the conditions are met.
The method comprises the following test steps of independently carrying out the Rogowski coil current test on each switching element in a main branch or a transfer branch sub-module of the direct current circuit breaker, judging that the state of the main branch or the transfer branch sub-module of the direct current circuit breaker is normal when the phase difference between the current obtained by the Rogowski coil current test and the loop current in data detected and output by the test circuit is 1/2, and judging that one switching element in the main branch or the transfer branch sub-module of the direct current circuit breaker is normal and one switching element is opened and disabled otherwise.
Optionally, in the above test method for closed loop on/off submodule of a direct current breaker, in the fifth step, if the equivalent resistance of the main branch or the transfer branch submodule of the direct current breaker is calculated to be between 10 and 300kΩ and the equivalent capacitance is calculated to be between 10 and 300 μf, the state of the main branch or the transfer branch submodule of the direct current breaker is judged to be normal.
Optionally, in the test method for the closed-loop on/off sub-module of the direct current breaker, the fifth step further includes the step that the test controller receives data detected and output by the test circuit, obtains a time difference between time of voltage change of a mechanical switch fracture in the direct current breaker and a switching-on command or switching-off command output by the communication interface DBC & VBC, and judges whether mechanical action delay of the mechanical switch meets technical specification requirements according to the time difference.
Optionally, in the above test method for closed-loop on/off submodule of a direct current breaker, in the second step, the communication interface DBC & VBC outputs a switching-on command or a switching-off command to a mechanical switch in the direct current breaker through an optical fiber, and sends an on/off control signal to the integrated driver.
Optionally, in the test method for the closed-loop on/off submodule of the direct-current circuit breaker, the first step further comprises connecting two ends of a main branch or a transfer branch submodule of the direct-current circuit breaker to a low-voltage power supply and a current limiting resistor which are connected in series, and outputting a low-voltage direct-current power supply signal with the voltage not exceeding 100V to the main branch or the transfer branch submodule of the direct-current circuit breaker by the low-voltage power supply and the current limiting resistor.
Optionally, in the test method for the closed-loop on-off sub-module of the direct current circuit breaker, the first step further comprises connecting the integrated drive to an energy supply power source, wherein the energy supply power source is provided with an isolation circuit and a voltage stabilizing circuit, and the direct current voltage stabilized at 20V is provided for the integrated drive.
Advantageous effects
The invention firstly receives a user instruction, and then outputs control signals to the test circuit and the communication interfaces DBC & VBC according to the corresponding user instruction, and drives the test circuit to output various signals so as to trigger a main branch or a transfer branch sub-module of the direct current circuit breaker to be tested. The main branch or the transfer branch sub-module of the triggered direct current circuit breaker outputs corresponding voltage or current signals, and the test controller acquires the signals through the test circuit for analysis. Thus, the invention can realize the judgment of the state of the direct current breaker. The test equipment is simple and easy to operate, convenient to operate, capable of testing the full-bridge module and the mechanical switch, wide in application scene and capable of meeting test requirements of each stage in the engineering research and development and engineering application process of the direct current breaker.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, and do not limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a DC circuit breaker closed loop on-off sub-module test apparatus for detecting a primary module of a DC circuit breaker of the present invention;
Fig. 2 is a schematic diagram of a closed-loop on-off sub-module test apparatus for detecting a transfer sub-module of a dc circuit breaker according to the present invention;
Fig. 3 is an experimental circuit diagram of an IGBT turn-on/off sub-module in the present invention;
fig. 4 is a signal waveform diagram of the IGBT in the normal state in the above test;
fig. 5 is a signal waveform diagram in the IGBT on failure state in the above test;
Fig. 6 is a signal waveform diagram in the IGBT off failure state in the above test;
fig. 7 is a signal waveform diagram of the above test in a normal 1 IGBT on-failure state of 1 IGBT;
fig. 8 is a signal waveform diagram of the above test in which 1 IGBT is normally 1 IGBT off failure state;
Fig. 9 is a signal waveform diagram in the case where breakdown exists in 2 IGBTs in the above-described test.
In the figure, 1 denotes a test controller, 2 denotes a communication interface DBC & VBC, 3 denotes an integrated drive, 4 denotes a test circuit, 51 denotes a full bridge circuit, 52 denotes a mechanical switch, 6 denotes a low voltage power supply, and 7 denotes a current limiting resistor.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a closed loop on-off sub-module test apparatus for a dc breaker according to the present invention, which can be used to detect a main sub-module of the dc breaker or can also be used to detect a transfer sub-module of the dc breaker shown in fig. 2. Two application scenarios of fig. 1 and fig. 2 are synthesized, the closed-loop on-off submodule test equipment of the direct-current breaker includes:
the test controller 1 is connected with a test circuit 4 and a communication interface DBC & VBC2;
communication interfaces DBC & VBC2 are connected with the test controller 1, the integrated drive 3 and the mechanical switch 52 in the direct current breaker;
an integrated driver 3, which is connected with the communication interface DBC & VBC2 and a main branch or a transfer branch sub-module of the direct current breaker;
and the test circuit 4 is connected with the main branch or the transfer branch sub-module of the direct current breaker and the test controller 1.
The dc breaker that it detects, referring to fig. 3, includes a full bridge module, a mechanical switch 52, and various switching elements including IGBT transistors. In the test process, the main branch or the transfer branch sub-module of the direct current breaker is also connected with a series connection of a low-voltage power supply 6 and a current limiting resistor 7 during detection, and the low-voltage power supply 6 and the current limiting resistor 7 are connected in series and then connected to two ends of the main branch or the transfer branch sub-module of the direct current breaker, so as to be used for outputting low-voltage direct current power supply signals not exceeding 100V to the main branch or the transfer branch sub-module of the direct current breaker. The current limiting resistor 7 may be selected to be around 20Ω to limit the current magnitude.
The above units constitute a system which can be operated by a user to perform the following test steps:
The first step, the test controller 1 receives a user instruction, and outputs a control signal to the test circuit 4 and the communication interface DBC & VBC2 according to the instruction, wherein the user instruction comprises a test starting time signal, a test class mark, a test parameter, a test process signal, a test result signal and a trigger emergency protection signal;
secondly, the communication interface DBC & VBC2 outputs a switching-on command or a switching-off command to a mechanical switch 52 in the direct current breaker according to a control signal output by the test controller 1, and sends a switching-on and switching-off control signal to the integrated drive 3;
The third step, the integrated drive 3 outputs a test trigger excitation signal according to an on-off control signal output by the communication interface DBC & VBC2, and triggers each circuit element in a main branch or a transfer branch sub-module of the direct current breaker;
The fourth step, the test circuit 4 receives voltage signals and current signals generated by each circuit element in the main branch or the transfer branch sub-module of the direct current breaker in response to the opening command, the closing command or the test trigger excitation signal, and converts the voltage signals and the current signals into detection data to be output;
And fifthly, the test controller 1 receives the data detected and output by the test circuit 4, analyzes the time of the change of the voltage signal and the current signal according to the data, calculates the state of a main branch or a transfer branch sub-module of the direct current circuit breaker, and equivalent resistance and equivalent capacitance to judge the state of the main branch or the transfer branch sub-module of the direct current circuit breaker, and judges whether circuit elements in the main branch or the transfer branch sub-module of the direct current circuit breaker fail. In general, the judging standard can be selected as that if the equivalent resistance of the main branch or the transfer branch sub-module of the direct current circuit breaker is calculated to be 10-300 kΩ and the equivalent capacitance is calculated to be 10-300 μF, the state of the main branch or the transfer branch sub-module of the direct current circuit breaker is judged to be normal.
The integrated drive 3 can be integrated in the manner of fig. 1 or fig. 2 on the dc circuit breaker to be tested. The device is connected with the communication interface DBC & VBC2 and a main branch or a transfer branch sub-module of the direct current circuit breaker, and is used for outputting a test trigger excitation signal according to an on-off control signal output by the communication interface DBC & VBC2 to trigger all circuit elements in the main branch or the transfer branch sub-module of the direct current circuit breaker.
In one implementation, the apparatus further comprises a power supply 9 connected to the integrated drive 3, the power supply 9 having an isolation circuit and a voltage regulator circuit, and being capable of providing a dc voltage to the integrated drive 3 that is stabilized at 20V during testing.
In order to distinguish the control signal from the collected current and voltage data signals, the invention can further provide that the communication interfaces DBC & VBC2 are connected with the test controller 1, the integrated drive 3 and the mechanical switch 52 in the direct current breaker through optical fibers. And the integrated drive 3 and the main branch or the transfer branch sub-module of the direct current breaker, the integrated drive 3 and the energy supply 9, the main branch or the transfer branch sub-module of the direct current breaker and the test circuit 4 and the test circuit and the test controller 1 are all connected through cables. The voltage and current data collected by the test circuit 4 through a cable comprise a first current and a first voltage generated by a full-bridge module in the direct current breaker under the direct current signal. Based on the above, the test controller can further calculate the capacitance value and the resistance value of the full-bridge module according to the first current and the first voltage, and the capacitance value and the resistance value are used as the basis for judging whether the full-bridge module works normally.
In addition, in order to ensure safety, the test communication interface DBC & VBC is also used for executing emergency stop operation and outputting an emergency stop signal when abnormality occurs in the test process, and controlling the drive of each circuit element to be canceled.
In the signal waveforms shown in fig. 4 to 9, the main branch or the transfer branch sub-module of the dc breaker is close to waveforms in both the IGBT normal state and the IGBT 1 on failure state, so in the fifth step, the test controller 1 receives the data detected and output by the test circuit 4, and determines that the switching element in the main branch or the transfer branch sub-module of the dc breaker satisfies that the loop current drops and the voltage rises when the loop current is not on, the voltage drops to 0 and the current rises when the loop current is on, and further performs a test step to determine that the current gradually drops to be close to 0 when the switching element is off and the voltage continuously rises, and then determines that the current obtained by the rogowski coil current test is different from the loop current in the data detected and output by the test circuit 4 by 1/2, and determines that the main branch or the transfer branch of the dc breaker is in the state when the loop current is off, or the main branch or the transfer branch of the dc breaker is normal, otherwise, the main branch or the transfer branch of the dc breaker is determined to be in the normal state.
Because the mechanical switch 52 is a mechanical switch of the main branch of the direct current breaker, the mechanical switch and the main sub-module are in series connection, and the test circuit can send a control switching-on and switching-off instruction to the mechanical switch through DBC & VBC so as to judge whether the switch is normal or not and can act according to the instruction. Specifically, in order to realize the detection of the mechanical switch delay, the fifth step further includes receiving, by the test controller 1, the data detected and output by the test circuit 4, and obtaining a time difference between the time of the voltage change of the break of the mechanical switch 52 in the dc breaker and the time of outputting the opening command or the closing command by the communication interfaces DBC & VBC 2. The time difference corresponds to a second voltage and a second current generated when the mechanical switch performs opening and closing operations under the direct current signal, and the test controller compares the second voltage with a preset voltage value and/or compares the second current with a preset current value, so as to judge whether the mechanical action delay of the mechanical switch 52 meets the technical specification requirement according to the time difference.
Under a more specific implementation mode, the invention utilizes the test controller 1 to acquire a test instruction input by a user, sends a test instruction to the communication interface DBC & VBC2 according to the test instruction, sends a start test instruction to the test circuit 4, the communication interface DBC & VBC2 acquires the test instruction, sends an on-off control signal to the integrated drive 3 of the sub-module according to the test instruction, and receives return state information from the integrated drive 3, including an on-off state, an IGBT state, a power state, a communication state and the like, the integrated drive 3 receives the control signal and sends a test trigger excitation signal to the sub-module of the DC breaker to be tested, the test circuit 4 acquires test data generated by the DC breaker to be tested under the test trigger excitation signal, and sends test data to the test controller 1, and sends test results to the communication interface DBC & VBC2, wherein the test results are results that the test circuit comprehensively analyzes the measured voltage, the current and the drive return state, and the results that whether the test passes or not. The method can conveniently test the full-bridge module 51, the mechanical switch 52 and the energy supply power supply 9 in the direct-current breaker closed-loop on-off sub-module test equipment, and can meet test requirements of each stage in the process of engineering research and development and engineering application of the direct-current breaker.
Specifically, in one implementation manner, the dc breaker 5 to be tested includes a full-bridge module 51, the test controller 1 obtains a test instruction input by a user, and sends the test instruction to the communication interfaces DBC & VBC2 according to the test instruction, where the communication interfaces DBC & VBC obtain the test instruction, and the test instruction includes a type of the full-bridge module 51, a test item of the test, a test time, and the like. The integrated drive 3 receives the control signal, sends 19V low-voltage signals to the main branch and transfer branch sub-modules of the direct current breaker to be tested, detects whether IGBT devices, drive signals, power supplies and the like are correct or not, and whether the components are normal or not, the test circuit 4 collects signals such as current, voltage and the like generated by the full-bridge module 51 under the direct current signals, the test controller calculates the capacitance value and the resistance value of the full-bridge module 51 according to the test data, and detects whether the basic functions such as trigger monitoring, electrical paths, IGBT on-off, bypass switches and the like of the sub-modules are correct or not. For example, a specific test circuit and parameters of the parallel IGBT turn-on/turn-off test are shown in fig. 2. The piezoelectric voltage was 100V and the current limiting resistance was 20Ω. The monitoring object in the test process is the voltage and the current at two ends of the device.
In a specific implementation process, the calculation process may adopt a calculation method in the prior art, and determine whether the full-bridge module 51 meets the requirement according to the calculated capacitance value and resistance value, so as to obtain a test result. For example, the acceptable value range of the capacitance value is 10-300 μF, the acceptable value range of the resistance value is 10-300 kΩ, when the capacitance value and the resistance value obtained by detection and calculation are respectively in the respective acceptable value ranges, the test result is normal, otherwise, the full bridge module 51 is judged to be abnormal. It should be noted that the above ranges are only for illustration, and are not intended to limit the present invention, and in practical application, the acceptable value ranges of the capacitance value and the resistance value can be adjusted according to practical needs.
In practical application, the test controller may further obtain test parameters such as maximum voltage, maximum current, and commutation time in the test process, and further generate a test waveform according to the calculated capacitance and resistance of the full-bridge module 51, and store the test waveform. According to the state of the IGBT, the method can be divided into 6 working conditions, namely, 2 IGBTs are normal, 2 IGBTs are switched on and off and fail, 1 IGBT is normal+1 IGBT is switched on and fails, 1 IGBT is normal+1 IGBT is switched off and fails, and breakdown exists in 2 IGBTs.
Specifically, as shown in fig. 4, when the IGBTs are not turned on, the loop current starts to drop, the voltage starts to rise by 35V, when the IGBTs are turned on at 0.003ms, the voltage drops to zero, and the current rises to 5A for 3ms. The IGBT is turned off at 0.006ms, at which time the current begins to drop, approaching zero after about 20ms, while the voltage continues to rise to 100V.
If the IGBT is in a switching abnormality state due to driving abnormality, fiber breakage, light intensity weakness, or the like, the 2 IGBT turn-on failure waveforms are shown in fig. 5. When the 2 IGBTs are all in turn-on failure, the loop current drops to zero after about 20ms, and the voltage starts to rise by 100V.
If the IGBT turns off abnormally due to driving abnormality, power abnormality, or the like, the test waveforms thereof are shown in fig. 6.
In addition, referring to fig. 8, the waveforms of 1 IGBT normal and another 1 IGBT turn-off failure of the sub-module are identical to those of 2 IGBT turn-off failures in fig. 6, and the two kinds of failures are unified into the same type of failure of the sub-module.
Since 1 IGBT in fig. 7 is normal and another 1 IGBT has an on fault consistent with the normal waveform of the sub-module in fig. 1, further inspection of the failure type is required. At this time, it is necessary to perform a test by separately testing the IGBT current. In the test process, 1 IGBT current is tested through the Rogowski coil, if the current difference of the two currents is 1/2 of the loop current, the test is correct, otherwise, the fault is caused.
Comparing the working conditions of the submodule, when the submodule is normal, 2 IGBTs of the submodule are turned on to be failed, the submodule has the breakdown of the IGBTs, and when 1 IGBT of the submodule is normal and the other 1 IGBT of the submodule is turned off to be failed, the type of the failure can be judged by testing the voltage and current waveforms of the submodule.
Specifically, in one embodiment, the dc breaker 5 further includes a mechanical switch 52. The communication interface DBC & VBC2 is used for sending opening and closing instructions to the mechanical switch 52, the integrated driver 3 receives a start test command and sends direct current signals to a main branch and a transfer branch submodule of the direct current breaker 5 to be tested, the direct current signals are low voltage of direct current 19V, the mechanical switch 52 collected by the test circuit 4 executes voltage and current generated when opening and closing operations under the direct current signals, and the test controller 1 judges instruction execution conditions of the mechanical switch 52 according to the voltage and current generated when the mechanical switch 52 executes the opening and closing operations. For example, if the voltage across the break of the mechanical switch 52 is detected when the break command is sent to the mechanical switch 52, the break voltage is zero in the initial state because the mechanical switch 52 is in the closed state, if the increase of the break voltage to the power supply voltage is detected, it is determined that the mechanical switch 52 has been successfully broken, the time of the voltage change is tested to obtain the delay of the break operation of the mechanical switch 52, and by receiving the break distance signal and the break position state signal of the mechanical switch 52, it is determined whether the mechanical characteristics of the mechanical switch 52 satisfy the specification.
The direct current breaker closed loop on-off submodule test equipment further comprises a low-voltage power supply 6 and a current limiting resistor 7, and the low-voltage power supply is used for providing electric energy for the full-bridge module 51 of the direct current breaker 5 to be tested. By adjusting the voltage range output by the low-voltage power supply 6, the power supply voltage of the full-bridge submodule 51 is detected, and whether the voltage is within the required technical specification range is judged. Specifically, the low voltage power supply 6 has an output voltage of 100V, and the current limiting resistor 7 has a resistance of 20Ω.
Specifically, the test equipment for the closed-loop on-off submodule of the direct-current breaker comprises a test controller 1, wherein the test controller is used for receiving test items and test parameters selected by a user, generating the test instruction and sending the test instruction to the communication interfaces DBC & VBC2, and the test instruction mainly comprises test starting, test types, test processes, test results, emergency trigger protection and the like.
In a preferred embodiment, the dc breaker closed-loop on-off submodule test apparatus according to the embodiment of the present invention further includes a power supply 9 for providing a power supply voltage for the integrated drive 3, where the power supply 9 is a 20V dc voltage with an isolated regulated power supply.
In practical application, when the communication interfaces DBC & VBC2 are abnormal in the test process, emergency stop operation is executed, wherein the abnormality refers to dangerous states of short circuit, damage and the like of the closed-loop on-off sub-module test equipment of the direct current breaker, so that the equipment and personal safety are protected. The direct current breaker closed loop on-off submodule test equipment also has an overvoltage and overcurrent protection function, and can protect all components of the direct current breaker closed loop on-off submodule test equipment.
The foregoing is a description of embodiments of the invention, which are specific and detailed, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (6)
1. A DC circuit breaker closed loop on-off sub-module test method is characterized by comprising the following test steps:
the method comprises the steps of receiving a user instruction, and outputting a control signal to a test circuit (4) and a communication interface (2) according to the instruction, wherein the user instruction comprises a test starting time signal, a test class mark, a test parameter, a test progress signal, a test result signal and a trigger emergency protection signal;
The second step, the communication interface (2) outputs a switching-on instruction or a switching-off instruction to a mechanical switch (52) in the direct current breaker according to a control signal output by the test controller (1), and sends a switching-on and switching-off control signal to the integrated drive (3);
the third step, the integrated drive (3) outputs a test trigger excitation signal according to an on-off control signal output by the communication interface (2) to trigger all circuit elements in a main branch or a transfer branch sub-module of the direct current breaker;
the fourth step, the test circuit (4) receives voltage signals and current signals generated by each circuit element in a main branch or a transfer branch sub-module of the direct current circuit breaker in response to the opening command, the closing command or the test trigger excitation signal, and converts the voltage signals and the current signals into detection data to be output;
Fifthly, the test controller (1) receives data detected and output by the test circuit (4), analyzes the time of the change of the voltage signal and the current signal according to the data, calculates the state of a main branch or a transfer branch sub-module of the direct current circuit breaker, and equivalent resistance and equivalent capacitance to judge the state of the main branch or the transfer branch sub-module of the direct current circuit breaker, and judges whether circuit elements in the main branch or the transfer branch sub-module of the direct current circuit breaker fail;
The fifth step comprises the following steps that a test controller (1) receives data detected and output by the test circuit (4) and judges that a switching element in a main branch or a transfer branch sub-module of the direct current circuit breaker is met, wherein the current of the loop is reduced and the voltage is increased when the main branch or the transfer branch sub-module is not turned on, the voltage is reduced to 0 and the current is increased when the switching element is turned on, and the current is gradually reduced to be close to 0 and the voltage is continuously increased;
the rogowski coil current test comprises the following test steps:
Independently carrying out rogowski coil current test on each switching element in a main branch or a transfer branch sub-module of the direct current circuit breaker;
Judging that the state of a main branch or a transfer branch sub-module of the direct current circuit breaker is normal when judging that the phase difference between the current obtained by the Rogowski coil current test and the loop current in the data detected and output by the test circuit (4) is 1/2 of the loop current, and judging that one switching element in the main branch or the transfer branch sub-module of the direct current circuit breaker is normal and one switching element is opened and disabled otherwise.
2. The method for testing the closed-loop on/off sub-module of the direct current breaker according to claim 1, wherein in the fifth step, if the equivalent resistance of the main branch or the transfer branch sub-module of the direct current breaker is calculated to be 10-300 kΩ and the equivalent capacitance is calculated to be 10-300 μf, the state of the main branch or the transfer branch sub-module of the direct current breaker is judged to be normal.
3. The method for testing the closed-loop on/off sub-module of the direct current breaker according to claim 1, wherein the fifth step further comprises the step that the test controller (1) receives data detected and output by the test circuit (4), obtains a time difference between time of voltage change of a break of a mechanical switch (52) in the direct current breaker and time of outputting a switch-on command or a switch-off command by the communication interface DBC & VBC (2), and judges whether mechanical action delay of the mechanical switch (52) meets technical specification requirements according to the time difference.
4. A method according to any one of claims 1-3, characterized in that in the second step, the communication interface (2) outputs a switching-off command or a switching-on command to a mechanical switch (52) in the dc breaker through an optical fiber, and sends a switching-on/off control signal to the integrated drive (3).
5. The method for testing the closed-loop on-off submodule of the direct-current breaker according to claim 1, wherein the method further comprises the step of connecting two ends of a main branch or a transfer branch submodule of the direct-current breaker to a low-voltage power supply (6) and a current limiting resistor (7) which are connected in series, and outputting a low-voltage direct-current power supply signal with the voltage of not more than 100V to the main branch or the transfer branch submodule of the direct-current breaker by the low-voltage power supply (6) and the current limiting resistor (7).
6. The method for testing the closed-loop on-off submodule of the direct-current breaker according to claim 1, wherein the first step further comprises the step of connecting the integrated drive (3) to an energy supply source (9), wherein the energy supply source (9) is provided with an isolation circuit and a voltage stabilizing circuit, and the integrated drive (3) is provided with direct-current voltage stabilized at 20V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910491699.9A CN110346707B (en) | 2019-06-06 | 2019-06-06 | DC circuit breaker closed loop on-off sub-module test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910491699.9A CN110346707B (en) | 2019-06-06 | 2019-06-06 | DC circuit breaker closed loop on-off sub-module test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110346707A CN110346707A (en) | 2019-10-18 |
| CN110346707B true CN110346707B (en) | 2025-09-16 |
Family
ID=68181551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910491699.9A Active CN110346707B (en) | 2019-06-06 | 2019-06-06 | DC circuit breaker closed loop on-off sub-module test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110346707B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333439B (en) * | 2019-06-06 | 2025-09-16 | 全球能源互联网研究院有限公司 | Closed-loop on-off sub-module test equipment for direct-current circuit breaker |
| CN110865291B (en) * | 2019-11-19 | 2025-08-22 | 全球能源互联网研究院有限公司 | A circuit and method for detecting high current shutdown capability of a power semiconductor device |
| CN115166495B (en) * | 2022-06-13 | 2025-04-25 | 国网北京市电力公司 | Fault detection method and device for DC circuit breaker |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105934810A (en) * | 2013-12-12 | 2016-09-07 | 伊顿工业(荷兰)有限公司 | Alternating current circuit breaker with self-test capability |
| CN107656196A (en) * | 2017-08-16 | 2018-02-02 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker routine testing equipment |
| CN110333439A (en) * | 2019-06-06 | 2019-10-15 | 全球能源互联网研究院有限公司 | DC circuit breaker closed-loop on-off sub-module test equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211792B1 (en) * | 1999-08-13 | 2001-04-03 | JADRIć IVAN | Method and apparatus detecting a failed thyristor |
| JP5716411B2 (en) * | 2011-01-20 | 2015-05-13 | トヨタ自動車株式会社 | Vehicle power supply system |
| CN103414167B (en) * | 2013-06-03 | 2016-06-22 | 国家电网公司 | The detection of circuit-breaker switching on-off coil state and guard method |
| CN104049166A (en) * | 2014-06-30 | 2014-09-17 | 北京四方继保自动化股份有限公司 | Rapid fault detection circuit based on pulse feedback |
| KR101671704B1 (en) * | 2016-03-29 | 2016-11-02 | 주식회사 우진산전 | Igbt switching test apparatus |
| CN106597268A (en) * | 2016-11-11 | 2017-04-26 | 陕西斯瑞新材料股份有限公司 | Action characteristic model for high-voltage switch |
| CN107807319B (en) * | 2017-09-22 | 2020-03-10 | 全球能源互联网研究院有限公司 | Insulated gate bipolar transistor IGBT test circuit and method |
-
2019
- 2019-06-06 CN CN201910491699.9A patent/CN110346707B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105934810A (en) * | 2013-12-12 | 2016-09-07 | 伊顿工业(荷兰)有限公司 | Alternating current circuit breaker with self-test capability |
| CN107656196A (en) * | 2017-08-16 | 2018-02-02 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker routine testing equipment |
| CN110333439A (en) * | 2019-06-06 | 2019-10-15 | 全球能源互联网研究院有限公司 | DC circuit breaker closed-loop on-off sub-module test equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110346707A (en) | 2019-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110333439B (en) | Closed-loop on-off sub-module test equipment for direct-current circuit breaker | |
| EP3591782B1 (en) | Input power supply selection circuit | |
| US10411501B2 (en) | Power supply device and switch control method therefor | |
| JP5431398B2 (en) | Bridging unit | |
| CN101609127B (en) | Relay fault detection circuit | |
| CN110346707B (en) | DC circuit breaker closed loop on-off sub-module test method | |
| US9998060B2 (en) | System and method for capacitor fault energy interruption in adjustable speed drives | |
| JP6246062B2 (en) | DC power generation system and method for protecting DC power generation system | |
| US9673695B1 (en) | System and method for intelligent circuit breaking in adjustable speed drives | |
| US10310003B2 (en) | Fault location in DC networks | |
| US20200136604A1 (en) | Method for controlling a direct current switch, direct current switch, and dc voltage system | |
| EP3074780B1 (en) | Electrical supply system | |
| KR101790134B1 (en) | Error diagnosis method for inverter | |
| KR20120112734A (en) | Switching module to limit and/or break the current of an electric power line | |
| CN112886541A (en) | Converter and IGBT gate drive protection circuit and method | |
| JP2016157364A (en) | Power control unit and control method thereof | |
| CN107305356A (en) | A kind of controlling switch application circuit and its fault detect guard method | |
| US20150185287A1 (en) | Detection device for power component drivers, and detection method thereof | |
| CN110912382B (en) | Switch protection | |
| CN107390079B (en) | Current transformer, crowbar circuit, state detection method and control method of crowbar circuit | |
| CN105929299A (en) | Electromobile DC/DC low-voltage power supply and test circuit, equipment, system and test method | |
| CN109116207B (en) | Method for pre-detecting IGBT abnormity in bridge structure | |
| CN111474422B (en) | Ground fault protection system | |
| US20190027921A1 (en) | Low phase surge protection device | |
| KR20120054194A (en) | Motor control device and motor protection system including the device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210518 Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Applicant after: STATE GRID BEIJING ELECTRIC POWER COMPANY ELECTRIC POWER Research Institute Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |