CN113253038B - Online monitoring device and method for comprehensive alarm unit of GIS equipment of transformer substation - Google Patents
Online monitoring device and method for comprehensive alarm unit of GIS equipment of transformer substation Download PDFInfo
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Abstract
本申请属于变电站技术领域，本申请提供一种变电站GIS设备综合报警单元在线监测装置及方法。该装置包括：控制模块、输出模块、输入模块以及电源模块。输出模块向被监测的综合报警单元发送测试电信号，若控制模块通过输入模块接收到反馈电信号，则认为综合报警单元正常工作，若接收不到则认为该综合报警单元运行异常，并发出总报警信号。本申请根据电信号的状态即可实现在线监测综合报警单元的运行是否异常，并且便于直接对存量综合报警单元进行改造安装；本监测装置可以通过螺丝固定并进行简单的卡扣配线即可完成在GIS设备汇控柜内的安装，工序简单。
The application belongs to the technical field of substations, and provides an online monitoring device and method for a comprehensive alarm unit of a GIS equipment in a substation. The device includes: a control module, an output module, an input module and a power supply module. The output module sends a test electrical signal to the monitored integrated alarm unit. If the control module receives the feedback electrical signal through the input module, it is considered that the integrated alarm unit is working normally. Alarm. According to the state of the electrical signal, the application can realize on-line monitoring of whether the operation of the comprehensive alarm unit is abnormal, and it is convenient to directly modify and install the stock comprehensive alarm unit; the monitoring device can be fixed by screws and simple buckle wiring can be completed. The installation in the GIS equipment control cabinet is simple.
Description
Technical Field
The application relates to the technical field of transformer substations, in particular to a device and a method for monitoring a comprehensive alarm unit of GIS equipment of a transformer substation on line, equipment and a storage medium.
Background
At present, with the rapid development of power networks, the number of substations is increasing. At present, the state signal monitoring of GIS high-voltage electrical equipment in a transformer substation is mainly realized by two modes, one mode is to configure an independent relay for each signal for monitoring, and the other mode is to integrate all signals into a comprehensive alarm unit for combined monitoring. For a GIS substation with long commissioning time, a large amount of operation and maintenance management practical experience shows that due to long-term live operation, internal electronic components are aged and damaged, and extreme working conditions that all signals are lost may occur, such as important signals for monitoring the running state of GIS equipment, for example, low air pressure of a circuit breaker SF6, low air pressure of a circuit breaker SF6, locking, three-phase inconsistent action of a body, non-stored energy of a spring and the like. These signals play a key role in monitoring the operation state of the high-voltage combined electrical equipment by operation and maintenance personnel. If the signals cannot be transmitted to the monitoring system in time to send out warning signals to inform the maintainers of processing in time, serious power grid and personal safety accidents can be caused.
However, the comprehensive alarm unit for monitoring the GIS high-voltage equipment in the existing transformer substation cannot send any indication signal when the comprehensive alarm unit operates abnormally. The abnormality of the comprehensive alarm unit can be discovered only when the operation and maintenance personnel carry out regular inspection and maintenance or the maintenance personnel carry out regular inspection work. When the comprehensive alarm unit is abnormal in operation and in a neutral period before defects are exposed and processed, high-voltage GIS equipment in the transformer substation is in an out-of-monitoring state, and great potential safety hazards exist.
Disclosure of Invention
In view of this, the present application aims at solving the problem that there is a great potential safety hazard when the high-voltage GIS equipment in the transformer substation is in an out-of-monitoring state in the idle period before the operation of the comprehensive alarm unit is abnormal and the defects are exposed to be processed.
In order to solve the technical problem, a first aspect of the present application provides an online monitoring device for a comprehensive alarm unit of a substation GIS device, including:
the control module is used for acquiring input signals and executing corresponding monitoring device execution actions according to the states of the input signals, wherein the states of the input signals comprise signal states and no-signal states, the monitoring device execution actions corresponding to the signal states are used for re-detecting the states of the input signals after a first preset time period, and the monitoring device execution actions corresponding to the no-signal states are used for generating a total alarm signal;
the output module is used for generating a test electric signal and inputting the test electric signal to the comprehensive alarm unit, one end of the output module is connected with a standby input loop of the comprehensive alarm unit in series, the other end of the output module is connected with the control module, and the test electric signal is used for electrifying the standby input loop;
the input module is used for receiving the feedback electric signal and sending the feedback electric signal to the control module as an input signal, one end of the input module is connected with an input loop of the control module in series, the other end of the input module is connected with a standby normally open contact of the comprehensive alarm unit in series, the standby normally open contact is closed when the standby input loop is electrified, and the feedback electric signal is generated by the comprehensive alarm unit when the standby normally open contact is closed;
and the power supply module is used for supplying power to the control module and is connected with the control module.
Further, the comprehensive alarm unit specifically comprises:
the input and central control module is used for receiving the test electric signal, and a standby input loop of the input and central control module is used as a standby input loop of the comprehensive alarm unit and is connected with one end of the output module in series;
and the opening module is used for generating a feedback electric signal, a standby normally-open contact of the opening module is connected with one end of the input module as a standby normally-open contact of the comprehensive alarm unit, and the opening module is connected with the input and central control module through a communication data flat cable.
Further, a transformer substation GIS equipment comprehensive alarm unit on-line monitoring device still includes:
the control module controls the on-off of the first switch when detecting that the state of the input signal is a no-signal state, the power supply module is connected with the input and central control module so as to supply power to the input and central control module, and the first switch is arranged on a loop of the power supply module and the input and central control module.
Further, the output module further comprises:
and the output module controls the second switch to be switched on and switched off.
Further, a transformer substation GIS equipment comprehensive alarm unit on-line monitoring device still includes:
and the delay module is used for controlling the on-off of the second switch by the control module according to a second preset time period in a delay way, and the delay module is arranged in the control module and is coupled with the control module.
Further, in the above-mentioned case,
the control module is connected with the public measurement and control device so that the control module can transmit the total alarm signal to the public measurement and control device.
Furthermore, the control module is connected with a common measurement and control device through a hard contact.
The application provides a method for monitoring a comprehensive alarm unit of GIS equipment of a transformer substation on line in a second aspect, which comprises the following steps:
s1: sending a test electric signal to the comprehensive alarm unit at regular time according to a first preset time period;
s2: judging whether a feedback electric signal of the comprehensive alarm unit is received, if so, judging that the comprehensive alarm unit works normally, and returning to the step S1; if not, the working power supply of the comprehensive alarm unit is disconnected, and the comprehensive alarm unit is restarted after time delay;
s3: sending the test electric signal to the comprehensive alarm unit again;
s4: judging whether the feedback electric signal of the comprehensive alarm unit is received again, if so, judging that the comprehensive alarm unit works normally, and returning to the step S1; if not, generating a total alarm signal.
The third aspect of the application provides a comprehensive alarm unit on-line monitoring equipment of GIS equipment of transformer substation, and the equipment includes treater and memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the online monitoring method of the comprehensive alarm unit of the GIS equipment of the transformer substation according to the instructions of the computer program.
A fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for monitoring the comprehensive alarm unit of the substation GIS device on line according to the second aspect is implemented.
In summary, the present application provides a device and a method for online monitoring of a comprehensive alarm unit of a substation GIS device, the device is provided with a control module, an output module, an input module and a power module, the output module sends a test electrical signal to the comprehensive alarm unit to be monitored, the input module receives a feedback electrical signal and sends the signal to the control module, and the control module judges the state of the feedback electrical signal and executes a corresponding monitoring device to execute actions according to the state. This device can realize whether the operation of on-line monitoring comprehensive alarm unit is unusual according to the state of signal of telecommunication to be convenient for directly to the installation of reforming transform of stock comprehensive alarm unit: this monitoring can be through the screw fixation and carry out simple buckle wiring and can accomplish the installation in GIS equipment control cabinet, and the process is simple.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an online monitoring device for a comprehensive alarm unit of a substation GIS device according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for monitoring a comprehensive alarm unit of a substation GIS device on line according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a GIS substation with long commissioning time, a large amount of operation and maintenance management practical experience shows that due to long-term live operation, internal electronic components are aged and damaged, and extreme working conditions that all signals are lost may occur, such as important signals for monitoring the running state of GIS equipment, for example, low air pressure of a circuit breaker SF6, low air pressure of a circuit breaker SF6, locking, three-phase inconsistent action of a body, non-stored energy of a spring and the like. These signals play a key role in monitoring the operation state of the high-voltage combined electrical equipment by operation and maintenance personnel.
The comprehensive alarm unit which runs for a long time on site researches and discovers that the abnormal phenomenon that the signal of the device cannot be sent is mainly caused by that the internal program runs for a long time to be dead or the metal oxidation occurs at the interface of the communication data flat cable and the main board to cause poor communication. In order to find out abnormal conditions that signals of the comprehensive alarm unit cannot be sent in time and carry out technical improvement and supplementary monitoring on a large number of GIS equipment comprehensive alarm units which are in use, the invention develops an online monitoring device for the GIS equipment comprehensive alarm unit of the transformer substation, and mainly realizes online monitoring on the running state of the comprehensive alarm unit. The on-line monitoring device is designed according to the structure adaptation of the existing comprehensive alarm unit, and can be used after being installed, so that the working principle of the comprehensive alarm unit can be further perfected, and the reliability and the stability of the alarm and signaling effectiveness of the comprehensive alarm unit can be improved.
Referring to fig. 1, the present embodiment provides an online monitoring device for a comprehensive alarm unit of a substation GIS device, including:
the control module is used for acquiring input signals and executing corresponding monitoring device execution actions according to states of the input signals, the states of the input signals comprise signal states and no-signal states, the monitoring device execution actions corresponding to the signal states are used for re-detecting the states of the input signals after a first preset time period, and the monitoring device execution actions corresponding to the no-signal states are used for generating a total alarm signal.
It should be noted that, the control module in this embodiment may adopt a Central Processing Unit (CPU) to collect an input signal and execute a predetermined program to refresh the system output. The state of the input signal corresponds to the state of the comprehensive alarm unit, namely when the comprehensive alarm unit works normally, a standby input loop of the comprehensive alarm unit is changed into a power-on state under the action of a test electric signal, and then a standby normally-open contact is closed, so that a feedback electric signal is transmitted to the control module through the input module, and at the moment, the state corresponds to the signal state; when the comprehensive alarm unit operates abnormally (such as the internal electronic components of the comprehensive alarm unit are aged and damaged), the standby input circuit and the standby normally-open contact in the comprehensive alarm unit are also abnormal (such as the standby input circuit is broken, the standby normally-open node is not closed when the standby input circuit is electrified), so that the input module cannot receive a feedback electric signal, the control module cannot receive the feedback electric signal, and the state is a no-signal state at the moment.
And the output module is used for generating a test electric signal and inputting the test electric signal to the comprehensive alarm unit, one end of the output module is connected with the standby input loop of the comprehensive alarm unit in series, the other end of the output module is connected with the control module, and the test electric signal is used for electrifying the standby input loop.
The input module is used for sending a feedback electric signal and sending the feedback electric signal to the control module as an input signal, one end of the input module is connected with an input loop of the control module in series, the other end of the input module is connected with a standby normally open contact of the comprehensive alarm unit in series, the standby normally open contact is closed when the standby input loop is electrified, and the feedback electric signal is generated by the comprehensive alarm unit when the standby normally open contact is closed.
It will be appreciated that a standby normally open contact a' of the operating combination alarm unit is used and connected in series to the input circuit of the monitoring device. If the comprehensive alarm unit is well operated, after receiving a positive electric signal sent by the monitoring device, a standby input loop of the comprehensive alarm unit is electrified, then the normally open contact A 'is closed, then a feedback electric signal is generated, a path is formed by closing the normally open contact A' to return to the monitoring device, and the monitoring device judges that the comprehensive alarm unit is normally operated and can wait for the next detection.
And the power supply module is used for supplying power to the control module and is connected with the control module.
It should be noted that the power module may adopt a dc 110V or dc 220V working power supply, and is applicable to all substation secondary control systems that adopt these two dc voltages.
According to the online monitoring device for the comprehensive alarm unit of the GIS equipment of the transformer substation, the output module sends the test electric signal to the comprehensive alarm unit to be monitored, the input module receives the feedback electric signal of the comprehensive alarm unit and sends the signal to the control module, the control module judges the state of the test electric signal, and the corresponding monitoring device executes the action according to the state. This device can realize whether the operation of on-line monitoring comprehensive alarm unit is unusual according to the state of signal of telecommunication to be convenient for directly to the installation of reforming transform of stock comprehensive alarm unit: this monitoring devices is compact, can accomplish the installation in GIS equipment collection accuse cabinet through the screw fixation and carry out simple buckle distribution, and the process is simple.
In addition, but this device can adopt plug-in structural design, promotes fortune maintenance efficiency: the input module, the output module and the power module of the monitoring device can adopt pluggable structural design, and the device can conveniently overhaul when the part needs to be replaced due to the fault.
The above is a detailed description of an embodiment of the online monitoring device for the comprehensive alarm unit of the transformer substation GIS equipment, and the following is a detailed description of another embodiment of the online monitoring device for the comprehensive alarm unit of the transformer substation GIS equipment.
The present embodiment is described in detail with respect to a comprehensive alarm unit including an input and central control module and an output module, in which
The input and central control module is used for receiving the test electric signal, a standby input loop of the input and central control module is used as a standby input loop of the comprehensive alarm unit and is connected with one end of the output module in series, and a standby relay A in the input and central control module is used as a standby input loop and is connected with one end of the input module in series in actual implementation;
the opening module is used for generating a feedback electric signal, the feedback electric signal is generated when the comprehensive alarm unit works normally, a standby normally-open contact A 'of the opening module is used as a standby normally-open contact of the comprehensive alarm unit and is connected with one end of the input module, the opening module is connected with the input and central control module through a communication data flat cable, and the standby normally-open contact A' is closed when the standby relay A is closed.
Referring to fig. 1, an online monitoring device for a comprehensive alarm unit of a substation GIS device includes:
the control module is used for acquiring the input signal and executing the corresponding monitoring device to execute actions according to the state of the input signal, the state of the input signal comprises a signal state and a no-signal state, the monitoring device corresponding to the signal state executes the actions as the state of monitoring the input signal again after a first preset time period, and the monitoring device corresponding to the no-signal state executes the actions as the state of generating a total alarm signal.
It should be noted that the control module may be connected to a common measurement and control device, and transmit the total alarm signal to the common measurement and control device, so as to further transmit to the substation telemechanical and station control background control system, and the power grid dispatcher and the station background system perform monitoring and alarm recording.
And the output module is used for generating a test electric signal and inputting the test electric signal to the input and central control module, one end of the output module is connected with the standby relay A of the input and central control module in series, the other end of the output module is connected with the control module, and the test electric signal is used for electrifying the standby input loop.
It can be understood that if the comprehensive alarm unit operates well, after receiving the positive electric signal sent by the monitoring device, the input of the comprehensive alarm unit and the corresponding backup relay A in the central control module are closed, the normally open contact A 'of the comprehensive alarm unit is closed, and the feedback electric signal generated by the comprehensive alarm unit can form a path through the closing of the normally open contact A' to return to the monitoring device.
And the input module is used for sending a feedback electric signal and sending the feedback electric signal to the control module as an input signal, one end of the input module is connected with an input loop of the control module in series, the other end of the input module is connected with a standby normally open contact of the opening module in series, and the feedback electric signal is generated by the comprehensive alarm unit when the standby normally open contact is closed.
And the power supply module is used for supplying power to the control module and the input and central control module, and the power supply module is respectively connected with the control module and the input and central control module.
And the control module controls the on-off of the first switch when detecting that the state of the input signal is a no-signal state, and the first switch is arranged on a loop of the power supply module and the input and central control module.
It can be understood that, when the control module detects that the state of the input signal is a no-signal state, the comprehensive alarm unit may be abnormal in operation. In view of the fact that part of the abnormal operation problems of the comprehensive alarm unit can be solved by restarting, an alarm signal does not need to be sent out at the moment. Therefore, under the condition that the input signal is in a non-state, the control module can control the first switch to complete the process of one-time opening and closing, so that the comprehensive alarm unit is restarted, and if the detection state is still in a non-signal state after the restart, the control module sends out a total alarm signal.
And the output module controls the second switch to be switched on and off. According to fig. 1, the second switch may be disposed on a loop between the output module and the input and central control module, or may be integrated in the output module.
And the delay module is used for controlling the on-off of the second switch by the control module according to a second preset time period in a delay way, and the delay module is arranged in the control module and is coupled with the control module.
It can be understood that the monitoring device controls the on-off of the second switch in a delayed manner by arranging the delay module, so that the monitoring device can selectively send a test electric signal to the comprehensive alarm unit. Further, when the comprehensive alarm unit is restarted, the second switch can be controlled by the output module to be turned off before restarting (preferably, the second switch can be turned off simultaneously when the first switch is turned off), and then turned on after a certain time (the time is controlled by the delay module and can be selected according to actual conditions) to send the test electric signal.
Furthermore, the control module can be connected with a common measurement and control device through a hard contact. The traditional relay contact triggers a hard contact signal, the signal transmission is stable and reliable, the remote signaling loop of the measurement and control device corresponding to the GIS high-voltage equipment interval is conveniently accessed, and the centralized processing and the uploading of abnormal signals of the comprehensive alarm unit can be realized.
The embodiment provides an online monitoring device for a comprehensive alarm unit of GIS equipment of a transformer substation. And under the certain delay action of the delay module, the online monitoring device judges the running condition of the GIS equipment comprehensive alarm unit according to the return condition of the transmitted electric signal. Because a normally closed contact of the monitoring device is connected in series in a device power supply loop of the comprehensive alarm unit. When the comprehensive alarm unit is judged to have a fault, the power supply contact is disconnected for a certain time through the first switch (which can be set according to the actual situation on site) and then is connected, so that the control and restart operation of the device power supply of the comprehensive alarm unit is realized. After the comprehensive alarm unit is restarted, the comprehensive alarm unit is detected again after time delay (which can be set according to actual conditions on site). If the on-line monitoring device still cannot receive the feedback signal, a total alarm signal is immediately sent out through the hard contact. The time delay function can be completed by controlling the second switch by the time delay module, namely, the second switch is controlled to be closed to control the sending of the test electric signal, so that the time delay detection is realized.
The total alarm signal is defined, collected and transmitted to a remote control machine and a station control background control system of the transformer substation by a measurement and control device corresponding to a fault GIS electrical equipment interval, and is monitored and alarm-recorded by a power grid dispatcher and an in-station background system. After receiving the total alarm signal sent by the monitoring device, the scheduling personnel immediately inform operation and maintenance personnel to go to the site for processing, check the actual operation condition of the GIS high-voltage equipment, prevent the GIS high-voltage equipment from losing the neutral operation period of monitoring due to the abnormity of the comprehensive alarm unit in the operation process, and ensure the safe and stable operation of the GIS high-voltage equipment and a power grid. When the comprehensive alarm unit is judged to operate normally, the online monitoring device of the GIS equipment comprehensive alarm unit keeps a normalized operation mechanism and continues to monitor the operation state of the GIS equipment comprehensive alarm unit.
The device can adopt an integrated circuit design, and is convenient for directly modifying and installing the stock comprehensive alarm unit. And can make this monitoring devices compact, only need to fix through the screw and carry out simple buckle distribution and can accomplish the installation in GIS equipment control cabinet, the process is simple. And the device can restart the comprehensive alarm unit when detecting the fault of the comprehensive alarm unit: the method can solve the problem of the faults of a large part of electronic components by using a restarting method, and when the monitoring device monitors that the comprehensive alarm unit operates abnormally, the monitoring device cuts off the power and restarts the power again according to the working logic, and the abnormal pretreatment of the comprehensive alarm unit is carried out in advance. If the comprehensive alarm unit recovers normal operation after restarting, the abnormity can be eliminated in time, and a large amount of unnecessary operation and maintenance manpower and material resource investment can be saved; if the abnormality still exists after the comprehensive alarm unit is restarted, the maintenance personnel are arranged to go to the site for troubleshooting and spare part replacement. The stability and the reliability of the operation of the power grid equipment are improved.
In addition, the device can also be provided with a self-checking function: when the monitoring device has a fault or loses power, an abnormal alarm signal can be sent out and sent to a dispatching and transformer substation monitoring system.
The above is a detailed description of an embodiment of the online monitoring device for the comprehensive alarm unit of the transformer substation GIS equipment, and the following is a detailed description of an embodiment of the online monitoring method for the comprehensive alarm unit of the transformer substation GIS equipment.
As shown in fig. 2, this embodiment provides an online monitoring method for a comprehensive alarm unit of a substation GIS device, including the following steps:
s1: sending a test electric signal to the comprehensive alarm unit at regular time according to a first preset time period;
it will be appreciated that the first predetermined period of time may be determined on an as-is basis, with the purpose of causing the monitoring means to periodically send a test electrical signal to the synthetic alarm unit.
S2: judging whether a feedback electric signal of the comprehensive alarm unit is received, if so, executing a step S21, namely judging that the comprehensive alarm unit works normally, and returning to the step S1; if not, executing step S22, disconnecting the working power supply of the comprehensive alarm unit, and restarting the comprehensive alarm unit after time delay;
s3: sending a test electric signal to the comprehensive alarm unit again;
s4: judging whether the feedback electric signal of the comprehensive alarm unit is received again, if so, returning to the step S21, namely judging that the comprehensive alarm unit works normally, and returning to the step S1; if not, step S42 is executed, i.e., a total alarm signal is generated.
It should be noted that the monitoring device may notify the relevant personnel to process by outputting a "comprehensive alarm unit failure" hard-contact signal (i.e., a total alarm signal) to the measurement and control or background machine.
According to the online monitoring method for the comprehensive alarm unit of the GIS equipment of the transformer substation, the online monitoring function of the running state of the comprehensive alarm unit of the GIS equipment of the transformer substation can be realized, the problem that a GIS equipment state monitoring signal cannot be sent out when the comprehensive alarm unit fails is effectively solved, the fault processing efficiency and the equipment running stability are improved, and powerful guarantee is provided for safe and reliable running of a power system.
The above is a detailed description of an embodiment of the online monitoring method for the comprehensive alarm unit of the transformer substation GIS equipment, and the following is a detailed description of an embodiment of the online monitoring device for the comprehensive alarm unit of the transformer substation GIS equipment.
The utility model provides a transformer substation GIS equipment synthesizes alarm unit on-line monitoring equipment, equipment includes treater and memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the online monitoring method of the comprehensive alarm unit of the GIS equipment of the transformer substation according to the instruction of the computer program.
The above is a detailed description of an embodiment of the online monitoring device for the integrated alarm unit of the transformer substation GIS device of the present application, and the following is a detailed description of an embodiment of a computer-readable storage medium of the present application.
A computer readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for monitoring the comprehensive alarm unit of the substation GIS device on line according to the foregoing embodiment is implemented.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
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| CN202110716192.6A CN113253038B (en) | 2021-06-28 | 2021-06-28 | Online monitoring device and method for comprehensive alarm unit of GIS equipment of transformer substation |
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| CN113253038B true CN113253038B (en) | 2021-09-10 |
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| CN202110716192.6A Active CN113253038B (en) | 2021-06-28 | 2021-06-28 | Online monitoring device and method for comprehensive alarm unit of GIS equipment of transformer substation |
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| CN101034124A (en) * | 2007-02-12 | 2007-09-12 | 珠海格力电器股份有限公司 | Variable frequency air conditioner power module and detection system and detection method of driving module of variable frequency air conditioner power module |
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