CN203433082U - Ultrahigh frequency (UHF) positioning analyzer for local discharge of transformer - Google Patents
Ultrahigh frequency (UHF) positioning analyzer for local discharge of transformer Download PDFInfo
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- CN203433082U CN203433082U CN201320561462.1U CN201320561462U CN203433082U CN 203433082 U CN203433082 U CN 203433082U CN 201320561462 U CN201320561462 U CN 201320561462U CN 203433082 U CN203433082 U CN 203433082U
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Abstract
本实用新型公开了一种变压器局部放电特高频定位分析器，包括用于接收探头采集的放电信号并对接收的放电信号进行调理的信号调理单元（1）、用于计算放电距离的信号处理单元（3）、对调理后的放电信号进行延时的精延时单元（2），所述精延时单元还与信号处理单元（3）相连，将延时后的信号发送给信号处理单元（3）以及接收信号处理单元（3）的延时控制信号。本实用新型通过延时技术使普通的采样电路能够对特高频放电信号进行采样分析，具有电路造价成本低、稳定系数好、控制方便等优点。
The utility model discloses a transformer partial discharge ultra-high frequency positioning analyzer, which comprises a signal conditioning unit (1) for receiving discharge signals collected by a probe and conditioning the received discharge signals, and a signal processing unit (1) for calculating discharge distances. Unit (3), the fine delay unit (2) for delaying the adjusted discharge signal, the fine delay unit is also connected to the signal processing unit (3), and sends the delayed signal to the signal processing unit (3) and receiving the delay control signal of the signal processing unit (3). The utility model enables the ordinary sampling circuit to sample and analyze the UHF discharge signal through the delay technology, and has the advantages of low circuit cost, good stability coefficient, convenient control and the like.
Description
Technical field
The utility model relates to transformer electric discharge monitoring technical field, relates in particular to a kind of partial discharge of transformer superfrequency positioning analysis device.
Background technology
Shelf depreciation is to cause Transformer Insulation Aging or the deteriorated one of the main reasons of even destroying, and the research of partial discharge of transformer diagnosis and detection is had to far-reaching theory significance and practical value widely.In addition,, in the manufacturing process of high voltage installation, the size that also needs utilization to detect partial discharge quantity is examined the insulation status of product.In the Partial Discharge Detection of transformer, superfrequency (UHF) detection method has the advantages such as antijamming capability is strong, sensitivity is high, is applicable to the Site Detection of partial discharge of transformer.But because ultrahigh-frequency signal velocity of propagation is fast, adopt the distance of general positioning circuit very difficult locking discharge source and superfrequency sensor, cannot obtain the particular location of transformer fault point, serve inconvenience to the maintenance band of transformer.
Utility model content
The technical problems to be solved in the utility model is just: the problems referred to above that exist for prior art, a kind of partial discharge of transformer superfrequency positioning analysis device is provided, it makes common positioning analysis circuit can identify nanosecond signal by smart delay circuit is set.
For achieving the above object, partial discharge of transformer superfrequency positioning analysis device of the present utility model, comprise for the discharge signal of receiving transducer collection the signal condition unit that the discharge signal receiving is nursed one's health, for calculating the signal processing unit of arcing distance, the smart delay unit that the discharge signal after conditioning is carried out to time delay, above-mentioned smart delay unit is also connected with signal processing unit, the delay control signal that the signal after time delay is sent to signal processing unit and receives signal processing unit.In prior art, because ultrahigh-frequency signal velocity of propagation is fast, collection to superfrequency discharge signal, only have by high-speed sampling and could identify nanosecond signal, sampling rate is minimum is 1G/s, and inventor finds in real work, and this sample circuit not only cost is high, and stability factor is poor, can not get a desired effect.Therefore, the utility model has carried out delay process to discharge signal, therefore, can adopt common sample circuit and chip to the discharge signal calculating of sampling, and can not only reduce sample circuit cost like this, also can effectively improve the stability factor of circuit.In prior art, for ultrahigh-frequency signal is sampled, those skilled in the art generally can take into account the performance that improves sample circuit, and ultrahigh-frequency signal is carried out to high-speed sampling, to improve the cost of sample circuit, obtain higher sampling.In the utility model, inventor changes conventional thought, from adjusting the thinking of signal, in conjunction with microwave technology and Digital Signal Processing, ultrahigh-frequency signal is carried out to time delay, solved a difficult problem for ultrahigh-frequency signal indistinguishable, support common sample circuit and chip sampling analysis, reduce equipment cost, and improve the stability of circuit.
As further improvement of the utility model, further above-mentioned signal condition unit comprises at least 4 independently signal condition modules; Above-mentioned smart delay unit comprises at least 4 independently smart time delay modules; Above-mentioned signal processing unit comprises independently time delayed signal output port of at least 4 groups; The group number of the quantity of above-mentioned signal condition module, the quantity of smart time delay module, time delayed signal output port is identical, each smart time delay module connects a signal condition module and one group of time delayed signal output port, so at least can form 4 signals collecting paths, signal condition unit and smart delay unit can at least gather 4 road discharge signals and send to signal processing unit to calculate discharge position.
Further, every group of time delayed signal output port comprises the first time delayed signal output pin and the second time delayed signal output pin; Above-mentioned smart time delay module is connected and composed by the first JK flip-flop and the second JK flip-flop; The J input end of the first JK flip-flop is connected with signal condition module, and Q output terminal is connected with the J input end of the second JK flip-flop, and CP input end is connected with the first time delayed signal output pin of time delayed signal output port; The Q output terminal of above-mentioned the second JK flip-flop is connected with signal processing unit, and K input end is connected with the second time delayed signal output pin of time delayed signal output port.In this programme, two JK flip-flop are carried out time delay to discharge signal under the control of signal processing unit, just can guarantee that partial discharge of transformer superfrequency positioning analysis device of the present utility model is can signal resolution higher, can identify nanosecond signal, so just can utilize common sampling A/D chip or circuit to complete collection and the calculating of superfrequency discharge signal, and use the cost of this essence delay unit much smaller than the cost that uses high resolving power sample circuit and chip, can effectively save cost.
Further, above-mentioned signal condition module comprises connected successively filtering circuit, buffer circuit, amplifying circuit.
Further, above-mentioned filtering circuit is three rank filtering circuits; Above-mentioned buffer circuit adopts optoisolator, can effectively eliminate noise, guarantees that the discharge signal obtaining is not disturbed by noise; Above-mentioned amplifying circuit adopts widescreen analog chip.
Further, above-mentioned filtering circuit comprises inductance L 2, inductance L 3, inductance L 4, capacitor C 14, capacitor C 15, capacitor C 16, capacitor C 26, wherein: inductance L 2, inductance L 3, capacitor C 14 one end access input signals; Inductance L 2, capacitor C 14 other end ground connection; Inductance L 3, capacitor C 15, capacitor C 26 are cascaded successively; After inductance L 4 and capacitor C 16 are in parallel, one end is connected between capacitor C 15 and capacitor C 26, other end ground connection; Above-mentioned capacitor C 14, capacitor C 15, capacitor C 16 adopt the noninductive electric capacity of 100pF, and inductance L 2, inductance L 3, inductance L 4 adopt high frequency magnetic core; Above-mentioned amplifying circuit adopts the broadband analog chip of EL2038 model.In this programme, it is that 400M is to 700M that the filter pass band of filtering circuit can reach passband; Amplifying circuit can guarantee that discharge signal can not decay in 1GHz, and can effectively amplify discharge signal, improves signal to noise ratio (S/N ratio).
Further, above-mentioned signal condition unit comprises 8 independently signal condition modules; Above-mentioned smart delay unit comprises 8 independently smart time delay modules; Above-mentioned signal processing unit comprises 8 groups of independently time delayed signal output ports, support the collection of 8 road signals, on the one hand, the discharge source position obtaining for the signal calculating more accurate more, on the other hand, also be equivalent to do redundant configuration, when preventing that the temporary derangement of part probe from can not collect signal, the signal analysis discharge source position that can utilize other probe to gather.
With respect to prior art, the utlity model has following advantage and beneficial effect:
1, the utility model has carried out delay process to discharge signal, can adopt common sample circuit and chip to the discharge signal calculating of sampling, having solved existing technology only has the high-speed sampling that is at least 1G/s by sampling rate could identify the problem of nanosecond signal, reduce the cost of sample circuit, improved the stability factor of circuit;
2, in the utility model, the time delay of discharge signal is by signal condition unit controls, and its delay time can be adjusted as required, very easy to use;
3, signal condition of the present utility model unit has adopted special inductance, capacitor element, wider than the filtered band of prior art, noise isolation better effects if.
Accompanying drawing explanation
Fig. 1 is partial discharge of transformer superfrequency positioning analysis device of the present utility model;
Fig. 2 is the structural representation of smart time delay module;
Fig. 3 is the structural representation of signal condition module.
Marginal data: 1, signal condition unit; 2, smart delay unit; 3, signal processing unit; 21, the first JK flip-flop; 22, the second JK flip-flop.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited only to this.
[embodiment 1]
As shown in Figure 1, the partial discharge of transformer superfrequency positioning analysis device of the present embodiment, comprise for the discharge signal of receiving transducer collection the signal condition unit 1 that the discharge signal receiving is nursed one's health, for calculating the signal processing unit 3 of arcing distance, the smart delay unit 2 that the discharge signal after conditioning is carried out to time delay, above-mentioned smart delay unit is also connected with signal processing unit 3, the delay control signal that the signal after time delay is sent to signal processing unit 3 and receives signal processing unit 3.
Wherein, signal condition unit 1 comprises at least 4 independently signal condition modules; Above-mentioned smart delay unit 2 comprises at least individual independently smart time delay module; Above-mentioned signal processing unit 3 comprises at least organizes independently time delayed signal output port and road signal input interface; The group number of the quantity of above-mentioned signal condition module, the quantity of smart time delay module, time delayed signal output port is identical, and each smart time delay module connects a signal condition module and one group of time delayed signal output port.Each signal condition module, smart time delay module form a road signal input unit, can gather at least 4 road discharge signals and be input in signal condition module and calculate, and wherein each time delayed signal output port of signal condition module is also controlled respectively the time delay of a road signal.In the present embodiment, described signal processing unit 3 is FPGA or DSP, and such as but not limited to the FPGA that adopts the Spartan6 of XILINX company series, it has programmability, is mounted with in advance discharge signal position calculation program in it.Because conventional FPGA and DSP have function, computing function and a plurality of signal input output interface of control, highly versatile, so in practical application, FPGA and DSP can be not limited to specific certain model; Probe in the present embodiment is conventional superfrequency probe, adopts phased array probe in the present embodiment, also can adopt other can gather the probe of superfrequency discharge signal in practical application.
[embodiment 2]
As shown in Figure 2, the circuit theory diagrams that Fig. 2 is smart time delay module.On the basis of embodiment 1, every group of time delayed signal output port in the present embodiment comprises the first time delayed signal output pin and the second time delayed signal output pin; Above-mentioned smart time delay module is connected and composed by the first JK flip-flop 21 and the second JK flip-flop 22; The J input end of the first JK flip-flop 21 is connected with signal condition module, and Q output terminal is connected with the J input end of the second JK flip-flop 22, and CP input end is connected with the first time delayed signal output pin of time delayed signal output port; The Q output terminal of above-mentioned the second JK flip-flop 22 is connected with signal processing unit 3, and K input end is connected with the second time delayed signal output pin of time delayed signal output port.In the present embodiment, the frequency of the output signal of the first time delayed signal output pin and the second time delayed signal output pin is controlled by signal processing unit 3, and the output state that two signals are controlled respectively the first JK flip-flop 21 and the second JK flip-flop 22 is realized the time delay of the discharge signal of input.Signal processing unit 3 is main by controlling the pulse signal frequency of the first time delayed signal output pin and the output of the second time delayed signal output pin, thereby control the input of two JK flip-flop, output in conjunction with the characteristic changing JK flip-flop of JK flip-flop under different input states, realize the time delay of the discharge signal of input, because the control principle of JK flip-flop is very simple, in the present embodiment, repeat no more its time delay principle, also no longer make a concrete analysis of its sequential chart.
[embodiment 3]
Fig. 3 is the circuit theory diagrams of signal condition module, and on the basis of embodiment 1 or 2, above-mentioned signal condition module comprises connected successively filtering circuit, buffer circuit, amplifying circuit.Above-mentioned filtering circuit is three rank filtering circuits, passband is that 400M is to 700M, its circuit specifically comprises inductance L 2, inductance L 3, inductance L 4, capacitor C 14, capacitor C 15, capacitor C 16, capacitor C 26, wherein: inductance L 2, inductance L 3, capacitor C 14 one end access input signals; Inductance L 2, capacitor C 14 other end ground connection; Inductance L 3, capacitor C 15, capacitor C 26 are cascaded successively; After inductance L 4 and capacitor C 16 are in parallel, one end is connected between capacitor C 15 and capacitor C 26, other end ground connection; Above-mentioned capacitor C 14, capacitor C 15, capacitor C 16 adopt the noninductive electric capacity of 100pF, and inductance L 2, inductance L 3, inductance L 4 adopt high frequency magnetic core.Above-mentioned buffer circuit mainly adopts optoisolator, can effectively eliminate noise, guarantees that obtaining discharge signal is not disturbed by other noises.Above-mentioned amplifying circuit adopts the broadband analog chip of EL2038 model, and assurance discharge signal can not decayed in 1GHz, and can effectively amplify local discharge signal, improves signal to noise ratio (S/N ratio).
[embodiment 4]
As shown in Figure 1, the present embodiment is adjusted signals collecting way on the basis of above-described embodiment, and main difference is: above-mentioned signal condition unit 1 comprises 8 independently signal condition modules; Above-mentioned smart delay unit 2 comprises 8 independently smart time delay modules; Above-mentioned signal processing unit 3 comprises 8 groups of independently time delayed signal output ports, totally 16 output pin P1-P16, every two pins are controlled the delay time of a smart time delay module, wherein P1 and P2 control the delay time of delay time, P3 and second smart time delay module of P4 control of first smart time delay module ... the rest may be inferred, and P15 and P16 control the delay time of the 8th smart time delay module.Its specific works mode is: high voltage electric equipment (as transformer) produces shelf depreciation, discharge source can be to surrounding radiated electromagnetic wave, due to completely equal for gathering the superfrequency probe spacing distance of discharge signal, discharge source is different to the distance of superfrequency probe, each probe receives ultrahigh-frequency signal asynchronism(-nization), 8 probes receive the asynchronism(-nization) of 8 tunnel superfrequency discharge signals, 8 tunnel superfrequency pulse signals are sent into signal condition unit 2 after being received by 8 probes respectively, 8 signal condition modules are carried out filtering to 8 road discharge signals respectively, isolation, amplify and process, filtering circuit filtering discharge signal low frequency part, the ultrahigh-frequency signal that retains 400M to 700M, isolation and amplifying circuit obviously promote partial-discharge ultrahigh-frequency signal signal to noise ratio (S/N ratio).Discharge signal after signal condition unit 2 is processed is sent into smart delay unit 3, by 8 smart time delay module Dui Mei road specific times of signal lag, for example: CH1 time delay 1 is delicate, CH2 time delay 2 is delicate, its accurate delay time is by the P1-P6 port controlling of signal processing unit 3, pulse signal after time delay is input to signal processing unit 3, and signal processing unit 3 catches pulse signal, calculates the position of discharge source.
Use the method for this partial discharge of transformer superfrequency positioning analysis device positioning analysis discharge position as follows:
Near step 11: at least 4 probe placement, discharge source, are gathered to local discharge signal, and wherein, all probes are placed point-blank by certain distance;
Step 12: set up cartesian coordinate system, by the coordinate position input signal processing unit of all probes 3 storage;
Step 13: the delay time that smart delay unit 2 is set by signal processing unit 3;
Step 14: signal condition unit 1 receives the discharge signal that all probes gather, and nurse one's health respectively receiving Ge road discharge signal;
Step 15: smart delay unit 2 carries out time delay according to the time delayed signal of signal processing unit 3 outputs to the discharge signal after nursing one's health;
Step 16: signal processing unit 3 receives all discharge signals, records the time of arrival of every road discharge signal, and calculates discharge source position.
Wherein, the delay time that by signal processing unit 3 smart delay unit 2 is set in step 13 is specially: the first time delayed signal output pin and the output signal frequency of the second time delayed signal output pin and the recurrent interval between two output signals in time delayed signal output port are set, this recurrent interval is the delay time of smart time delay module, the recurrent interval of wherein, being separated by between the first time delayed signal output pin of all time delayed signal output ports and two signals of the first time delayed signal output pin output is all different.
In step 11, probe adopts phased array probe, and for gathering superfrequency discharge signal, all probes are placed point-blank by fixing spacing distance is equidistant, to gather better superfrequency discharge signal.
The position of calculating discharge source in step 16, concrete grammar is as follows:
Step 161: signal processing unit 3 receives 4 road discharge signals;
Step 162; Calculate the mistiming of 4 road discharge signal arriving signal processing units 3;
Step 163: set up the system of equations between discharge source and 4 probe positions: first, set up system of equations according to the discharge signal time of the coordinate position of each probe and record:
Wherein, the transmission speed that v is discharge signal, is known fixed value 300000km/s; (X, Y) is the position coordinates of discharge source, unknown number; (X
1, Y
1), (X
2, Y
2), (X
6, Y
6) (X
5, Y
5) be respectively probe 1, pop one's head in 2, pop one's head in 6,5 the position coordinates of popping one's head in, be recorded in advance in signal processing unit 3, known; t
1,t
2,t
6and t
5for popping one's head in 1, pop one's head in 2, pop one's head in 6, the delay time of the signal of 5 collections of popping one's head in, be recorded in advance in signal processing unit 3, known; t
15the mistiming that probe 1 and 5 signals that gather of popping one's head in reach signal processing unit 3, t
26the mistiming that probe 2 and 6 signals that gather of popping one's head in reach signal processing unit 3, t
15,t
26in step 162, calculate.That is,, in above-mentioned system of equations, only having X, Y is unknown number.
Step 163: solve above-mentioned system of equations and can try to achieve X and Y, obtain the position of discharge source.To above-mentioned system of equations be solved to the conventional method for solving of art of mathematics, in the present embodiment, repeat no more its process, in addition, solve programmable FPGA that this system of equations can adopt by signal processing unit 3 or CPLD or CPU and complete.
In order to make X, Y try to achieve unique solution, can adopt 8 probes to gather 8 groups of signals, set up 4 formula and solve: on the basis of above-mentioned two computing formula, set up formula (3) and formula (4):
In formula (1), (2), each parameter meaning is the same, same, (X
3, Y
3), (X
7, Y
7), (X
4, Y
4) (X
8, Y
8) be respectively probe 3, pop one's head in 7, pop one's head in 4,8 the position coordinates of popping one's head in, known; t
3,t
4,t
7and t
8for popping one's head in 3, pop one's head in 4, pop one's head in 7, the delay time of the signal of 8 collections of popping one's head in, known; t
37the mistiming that probe 3 and 7 signals that gather of popping one's head in reach signal processing unit 3, t
48be the mistiming that probe 4 and 8 signals that gather of popping one's head in reach signal processing unit 3, in step 162, solve.Solve above-mentioned 4 equations, can try to achieve the unique value of X, Y.Wherein, solving equation (1) and equation (2) obtain first group of solution of (X, Y), in this group solution, (X, Y) has more than one solution at least, has more than one pair of value, for example may there be (a, b), (a, b) two solutions, or there are (a, b), (a, b), (an a,-b), (a,-b) 4 solutions, a wherein, b is constant; Solving equation (3) and (4) obtain second group of solution of (X, Y), same, and in this group solution, (X, Y) also has more than one solution (having more than one pair of value) at least; Contrast first group of solution and second group of solution, because discharge source position is fixed, so have an identical solution in first group of solution and second group of Xie Zhongbi, this identical solution is the position coordinates at discharge source place.In concrete application, the packet mode of 4 equations is not limited only to above-mentioned packet mode, and 4 equations can be divided into arbitrarily two system of equations, utilize two system of equations respectively to solve two groups of solutions, and in two groups of solutions, identical solution is exactly the position coordinates at discharge source place.
Below be only preferred implementation of the present utility model, protection domain of the present utility model is also not only confined to above-described embodiment, and all technical schemes belonging under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, the some improvements and modifications not departing under the utility model principle prerequisite, should be considered as protection domain of the present utility model.
Claims (7)
1. partial discharge of transformer superfrequency positioning analysis device, comprise for the discharge signal of receiving transducer collection the signal condition unit (1) that the discharge signal receiving is nursed one's health, for calculating the signal processing unit (3) of arcing distance, it is characterized in that, also comprise the smart delay unit (2) that the discharge signal after conditioning is carried out to time delay, described smart delay unit is also connected with signal processing unit (3).
2. partial discharge of transformer superfrequency positioning analysis device according to claim 1, is characterized in that, described signal condition unit (1) comprises at least 4 independently signal condition modules; Described smart delay unit (2) comprises at least 4 independently smart time delay modules; Described signal processing unit (3) comprises independently time delayed signal output port of at least 4 groups; The group number of the quantity of described signal condition module, the quantity of smart time delay module, time delayed signal output port is identical, and each smart time delay module connects a signal condition module and one group of time delayed signal output port.
3. partial discharge of transformer superfrequency positioning analysis device according to claim 2, is characterized in that, every group of time delayed signal output port comprises the first time delayed signal output pin and the second time delayed signal output pin; Described smart time delay module is connected and composed by the first JK flip-flop (21) and the second JK flip-flop (22); The J input end of the first JK flip-flop (21) is connected with signal condition module, and Q output terminal is connected with the J input end of the second JK flip-flop (22), and CP input end is connected with the first time delayed signal output pin of time delayed signal output port; The Q output terminal of described the second JK flip-flop (22) is connected with signal processing unit (3), and K input end is connected with the second time delayed signal output pin of time delayed signal output port.
4. partial discharge of transformer superfrequency positioning analysis device according to claim 2, is characterized in that, described signal condition module comprises connected successively filtering circuit, buffer circuit, amplifying circuit.
5. partial discharge of transformer superfrequency positioning analysis device according to claim 4, is characterized in that, described filtering circuit is three rank filtering circuits, and described buffer circuit adopts optoisolator, and described amplifying circuit adopts widescreen analog chip.
6. partial discharge of transformer superfrequency positioning analysis device according to claim 5, it is characterized in that, described filtering circuit comprises inductance L 2, inductance L 3, inductance L 4, capacitor C 14, capacitor C 15, capacitor C 16, capacitor C 26, wherein: inductance L 2, inductance L 3, capacitor C 14 one end access input signals; Inductance L 2, capacitor C 14 other end ground connection; Inductance L 3, capacitor C 15, capacitor C 26 are cascaded successively; After inductance L 4 and capacitor C 16 are in parallel, one end is connected between capacitor C 15 and capacitor C 26, other end ground connection; Described capacitor C 14, capacitor C 15, capacitor C 16 adopt the noninductive electric capacity of 100pF, and inductance L 2, inductance L 3, inductance L 4 adopt high frequency magnetic core; Described amplifying circuit adopts the broadband analog chip of EL2038 model.
7. according to the arbitrary described partial discharge of transformer superfrequency positioning analysis device of claim 2 to 6, it is characterized in that, described signal condition unit (1) comprises 8 independently signal condition modules; Described smart delay unit (2) comprises 8 independently smart time delay modules; Described signal processing unit (3) comprises 8 groups of independently time delayed signal output ports.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472376A (en) * | 2013-09-11 | 2013-12-25 | 国家电网公司 | Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472376A (en) * | 2013-09-11 | 2013-12-25 | 国家电网公司 | Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof |
| CN103472376B (en) * | 2013-09-11 | 2016-03-02 | 国家电网公司 | Partial discharge of transformer superfrequency positioning analysis device and method for positioning analyzing thereof |
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