CN100370267C - On-line detecting method and its device for multiple path transient wave form over voltage of power system - Google Patents

On-line detecting method and its device for multiple path transient wave form over voltage of power system Download PDF

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CN100370267C
CN100370267C CNB2005100417951A CN200510041795A CN100370267C CN 100370267 C CN100370267 C CN 100370267C CN B2005100417951 A CNB2005100417951 A CN B2005100417951A CN 200510041795 A CN200510041795 A CN 200510041795A CN 100370267 C CN100370267 C CN 100370267C
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voltage
signal
waveform
program
data
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CN1683936A (en
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徐阳
韦亚平
张琪
曹晓珑
席保峰
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西安交通大学
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Abstract

The present invention provides an on-line detecting device for multi-channel transient waveform over-voltage of an electric power system. The present invention is composed of a high-voltage divider, a signal conditioning unit, a collecting unit, an industrial control computer (comprising a liquid crystal display, a keyboard and a mouse and applied software. Voltage signals are respectively led in from different detection points of high voltage bus lines in each phase and are respectively connected to the signal inputting end of the signal conditioning unit by a coaxial cable after capacitance voltage is divided by the high-voltage divider. After the voltage signals are regulated by the signal conditioning unit, not only are the regulated voltage signals output to a corresponding voltage signal inputting end by the coaxial cable, but also triggering signals generated by the signal conditioning unit are output to the triggering signal inputting end of the collecting unit. The collecting unit is communicated with the industrial control computer by a PCI bus line. When over-voltage is detected, the signal conditioning sends out triggering signals to inform the collecting unit to collect the triggering signals. The applied software installed on the industrial control computer can control the program in the whole detecting process.

Description

Multiple path transient wave form over voltage of power system online test method and device thereof

Technical field

The present invention relates to a kind of online test method and device thereof, particularly a kind of multiple path transient wave form over voltage of power system online test method and device thereof.

Background technology

The reliability of power system power supply is to be judged by the number of times and the duration of (as 1 year) interruption user power supply within a certain period of time.Reliability depends on the anti-surge characteristic of electric system to a great extent, though there are many reasons may cause the interruption of powering, insulation breakdown is modal.

In order to guarantee the reliability of power system power supply, all kinds of electrical equipments should have enough electric insulation intensity reliably in the system.Under normal operation, the insulation system of these equipment is in system under the effect of high working voltage, still, and owing to various reasons, the system the most temporary transient too high voltages of high working voltage, i.e. superpotential may appear being higher than in the regional area in the system.

Various superpotential waveforms, amplitude and duration are all inequality, and variation range is also very big, and superpotential ability is born in these different parameters influence insulation.For example, served as voltage magnitude when very high, insulation is punctured, also can repeatedly impel insulation ag(e)ing under the effect, the reduction breakdown field strength if amplitude is less.Operating experience and studies show that superpotential is to cause the immediate cause of power system insulation damage accident also is the deciding factor of selecting the insulation of electrical installation level.

When superpotential initiating system accident, owing to the reason of accident is intricate, if do not have effective detection means to obtain relevant superpotential authentic communication, only depending on hypothesis and inferring is to be difficult to accidents caused reason is made correct analysis and judgement.Therefore, in electric system, superpotential detection there are extremely important social effect and economic benefit.

Fault wave recording device particularly with the overall process fault wave recording device of memory function, is the various accidents of Power System Analysis, the important device that improves the operation of power networks level.Utilizing oscillograph can differentiate electrical network has the time and the failure judgement place of the fault of non-fault, what character, fault generation and disappearance, can clearly grasp the variation of fault phase voltage.These not only provide foundation for analysis of Short Circuit Fault, system oscillation analysis, mechanical and electrical protection motion analysis and electrical equipment malfunction analysis, also provide foundation for system's Over-voltage Analysis.This instrument can be used for the long-time running record, also can be used as the testing tool of site test.

At present, the fault wave recording device that in electric system, adopts, essential record be fault waveform based on power frequency, because it is lower that its signal obtains bandwidth by voltage transformer (VT), and the lower sampling rate of sampling unit, more shallow reasons such as sampling depth, radio-frequency component in some transient overvoltage is not detected, can not record the various superpotential waveform that electric system suffers truly.

Summary of the invention

Low at the fault wave recording device sampling rate that in electric system, adopts at present, sampling depth is shallow, radio-frequency component in some transient overvoltage is not detected, can not record the deficiencies such as various over-voltage waveforms that suffer in the electric system truly, the objective of the invention is to, a kind of multiple path transient wave form over voltage of power system online test method and device thereof are provided.

In order to realize above-mentioned task, the technical solution used in the present invention is: the multiple path transient wave form over voltage of power system on-line detection method, adopt high-voltage bleeder, signal condition unit, collecting unit and industrial control computer and application software thereof to constitute the online detection platform of electric system multiple path transient wave form, it is characterized in that this method may further comprise the steps:

1) voltage signal extraction step: with at least one high-voltage bleeder respectively from the high voltage bus correspondence at random or specify check point to introduce voltage signal; The high-voltage arm capacitor C 1 of high-voltage bleeder is connected with low-voltage arm capacitor C 2, the high pressure input is added in the C1 and the C2 two ends of series connection, output is then extracted from the two ends of low-voltage arm capacitor C 2, and voltage signal is connected respectively to the plurality of voltages signal input part of a signal condition unit by concentric cable behind high-voltage bleeder;

2) signal condition step: adopt the signal condition unit that the voltage signal that extracts is handled, every road signal at first passes through the second divided voltage circuit, and one road signal links to each other with the signal input channel of capture card then, and another road signal then enters trigger circuit; Described trigger circuit are the double threshold comparator circuit, when the signal voltage absolute value of input trigger circuit is recorded wave voltage greater than startup, and trigger circuit output high level, i.e. trigger circuit action produces trigger pip triggering collection card image data; Otherwise output low level, capture card is not triggered;

3) step of data acquisition: notify collecting unit by concentric cable when the signal condition element keeps track will produce high level to superpotential, collecting unit is just gathered according to set acquisition parameter, by pci bus the data that the collect path by appointment is saved on the hard disk of industrial control computer then;

4) the programmed control step of testing process: by application software control collecting unit, record, the superpotential amplitude of storage, waveform and the relevant information of industrial control computer inside, the data waveform file that inquiry has been preserved, and carry out the demonstration of any passage waveform and relevant information, realize the multiple operation of waveform and the programmed control of whole testing process.

The program of described application software is worked out by the graphical programming software LabVIEW of America NI company, and program mainly is made up of master routine, capture program and three parts of data call program; Master routine is used to control capture program and data call program; Its workout content is: master routine control capture program and data call program; Capture program is controlled each acquisition parameter, gathers in real time, shows over-voltage waveform, and preserves over-voltage waveform and relevant information to specified path; The support of data call program can be carried out the demonstration of any passage waveform and relevant information to the inquiry of the superpotential historical data of having preserved.

Realize the device of above-mentioned detection method, it is characterized in that it comprises:

More than one high-voltage bleeder is used to introduce voltage signal, and high-voltage bleeder at random or specify and to be distributed on the different check points of high voltage bus is connected respectively to the voltage signal input end of signal condition unit by concentric cable behind capacitance partial pressure;

-signal condition unit, be used for the voltage signal that high-voltage bleeder is introduced is handled, this signal condition unit mainly comprises second divided voltage circuit and trigger circuit, every road voltage signal at first passes through second divided voltage, one road signal links to each other with the signal input channel of capture card then, another road signal then enters trigger circuit, the collection of the trigger pip control capture card that trigger circuit produce;

-collecting unit, be used for collection to voltage signal, collecting unit is made up of polylith capture card and RTSI bus, the card number of the way decision capture card of signalling channel, a capture card is arranged as main card in collecting unit, other cards are as secondary card, the main card clock passes through the RTS1 bus synchronous with secondary card clock, receive acquisition when main card and will notify other secondary cards by the RTSI bus, thereby each capture card is realized synchronous acquisition, and by pci bus the data that the collect path by appointment is saved on the hard disk of industrial control computer;

-industrial control computer, be used for the control of whole testing process, its inside includes the application software of multiple path transient wave form over voltage of power system on-line measuring device, write down, store superpotential amplitude, waveform and relevant information in different acquisition controlling modes, can inquire about the data waveform file of having preserved, and carry out the demonstration of any passage waveform and relevant information, realize multiple operation to waveform.

Described high-voltage bleeder adopts capacitance partial pressure, intrinsic standoff ratio: 1000: 1, and the highest response frequency 100MHZ.

Described signal condition unit contains secondary bleeder circuit and trigger circuit, every road signal at first passes through second divided voltage, one road signal links to each other with the signal input channel of capture card then, another road signal then enters trigger circuit, trigger circuit are the double threshold comparator circuit, when the signal voltage absolute value of input trigger circuit is recorded wave voltage greater than startup, trigger circuit output high level, i.e. trigger circuit action produces trigger pip triggering collection card image data; Otherwise output low level, capture card is not triggered;

The program of described application software is worked out by the graphical programming software LabVIEW of America NI company, and program mainly is made up of master routine, capture program and three parts of data call program; Master routine is used to control capture program and data call program; Its workout content is: master routine control capture program and data call program; Capture program is controlled each acquisition parameter, gathers in real time, shows over-voltage waveform, and preserves over-voltage waveform and relevant information to specified path; The support of data call program can be carried out the demonstration of any passage waveform and relevant information to the inquiry of the superpotential historical data of having preserved.

This device can be gathered external overvoltage in the multiple power system multiple path transient wave form over voltage on-line measuring device transient waveform simultaneously under different acquisition controlling, not only show, store detected over-voltage waveform and relevant information in real time, and can inquire about the superpotential historical data and support the demonstration of any passage waveform and relevant information, can edit the formation document simultaneously.

The present invention can gather multiple power system transients waveform superpotential simultaneously under different acquisition controlling, not only show, store detected over-voltage waveform and relevant information in real time, and can inquire about the superpotential historical data and support the demonstration of any passage waveform and relevant information, can edit the formation document simultaneously.Realized robotization, the intellectuality of whole service process, not only stable, easy to operate, and also it is on duty to need not personnel in the operational process.The present invention can record the various superpotential waveform that suffers in the multiple path transient wave form over voltage of power system on-line measuring device truly, has high reliability, strong anti-interference ability and hi-fi, can quantize the Hyper-Voltage of Power Systems level, verify the deviation of superpotential Theoretical Calculation and actual conditions with this, for better Insulation Coordination, revision dielectric level provide reference.

Description of drawings

Fig. 1 is a structure drawing of device of the present invention.

Fig. 2 is the schematic diagram of high-voltage bleeder of the present invention.Ui is a voltage input end among the figure, and Uo is a voltage output end, and C1 is a high-voltage arm electric capacity, and C2 is a low-voltage arm electric capacity.

Fig. 3 is the circuit theory diagrams of signal condition of the present invention unit.Ui is a signal input part among the figure, Uo is a signal output part, R1, R2, R3, R4, R5, R6, R7, R8 are respectively resistance, C1, C2, C3, C4 are respectively electric capacity, A1 is four input high-speed comparators, D1, D2 are respectively the speed-sensitive switch diodes, and V+, V-are respectively the positive and negative power supplies of four input high-speed comparators.

Fig. 4 is application structure figure of the present invention.

Fig. 5 is application flows figure of the present invention.

The present invention is described in further detail below in conjunction with embodiment that accompanying drawing and inventor provide.

Embodiment

According to the method described above, the present invention uses virtual instrument technique, with the industrial control computer is hardware platform, constitutes multiple path transient wave form over voltage of power system on-line measuring device multiple path transient wave form on-line measuring device in conjunction with high-voltage bleeder, signal condition unit, collecting unit and application software.

Present embodiment is introduced voltage signal by six high-voltage bleeders respectively from six check points of high voltage bus, be connected respectively to six road voltage signal input ends of signal condition unit after the dividing potential drop by concentric cable, linked to each other with the trigger pip input end and six road voltage signal input ends of collecting unit respectively by the trigger pip output terminal and six road voltage signal output ends of concentric cable with the signal condition unit after the processing, collecting unit is by pci bus and industrial control computer communication again.When detecting superpotential, the signal condition unit just sends the collection of trigger pip notice collecting unit.Be installed in the programmed control that application software on the industrial control computer realizes whole testing process.

Press the multiple path transient wave form over voltage of power system on-line measuring device the key technical indexes that present embodiment constitutes:

1) can survey superpotential wave head scope

It is the transient waveform superpotential of 50ns that I is surveyed wave head;

2) sampling channel

6 analog quantity channels of this device configuration can be expanded;

3) sampling rate

Sample rate adjusted, every passage all can be up to 100MS/s;

4) sampling depth

Sampling depth is adjustable, and every passage all can be up to 2M;

5) start the record wave voltage

Adjustable, generally be made as 1.5 times of rated voltage;

6) input impedance

1MΩ、50Ω。

7) trigger the reference position in advance

Adjustable in the 0-100% (with respect to the number percent of sampling depth).

Innovation point:

1) sensitive multiple path transient wave form over voltage of power system on-line measuring device is reliably realized the interior online detection of external overvoltage, automatic following function, can note six road transient waveform overvoltage signals complete when superpotential takes place, exactly simultaneously;

2) to survey wave head be the transient waveform superpotential of 50ns to I;

3) acquisition function of high quality and high efficiency, sampling rate and sampling depth are adjustable, respectively up to 100MS/s and 2M;

4) flexible data call function can be inquired about and preserved the superpotential historical data, carries out the demonstration of any passage waveform and relevant information, realizes the multiple operation to waveform.

Describe in further detail below in conjunction with the various piece of accompanying drawing device.

1. high-voltage bleeder

Device of the present invention as shown in Figure 1,

The schematic diagram of high-voltage bleeder as shown in Figure 2.High-voltage bleeder adopts the capacitance partial pressure mode, and after high-voltage arm electric capacity and the low-voltage arm capacitances in series, input is added in two ends, series connection back, and output is then extracted from low-voltage arm electric capacity two ends.

2. signal condition unit

Signal is after the high-voltage bleeder dividing potential drop, and entering signal is nursed one's health the unit.The signal condition unit contains bleeder circuit and trigger circuit, and its circuit theory diagrams respectively as shown in Figure 3.In the signal condition unit, every road signal at first passes through bleeder circuit, and one road signal links to each other with the signal input channel of capture card then, and another road signal then enters trigger circuit.The trigger pip control capture card collection that trigger circuit produce.Trigger circuit are the double threshold comparator circuit.When the signal voltage absolute value of input trigger circuit is recorded wave voltage greater than startup, trigger circuit output high level, i.e. trigger circuit action produces trigger pip triggering collection card image data; Otherwise output low level, capture card is not triggered.In actual measurement, trigger the beginning of representing an incident.But certain voltage signal reaches a certain amplitude when triggering, and this signal exists before this, so realized the pre-triggering function of collecting unit in native system, complete with the over-voltage waveform that guarantees to collect.

3. collecting unit

Collecting unit of the present invention adopts three PCI-5112 type data collecting cards of America NI instrument company, erects a collecting unit that can carry out the multiple signals data acquisition simultaneously jointly with the RTSI bus.Capture card is installed in the industrial control computer, and real-time image data is also transmitted data.It adopts the pci bus mode, because the high speed characteristics of pci bus has solved problems such as real-time collection, real-time Transmission and real-time storage effectively, has solved the transmission bottleneck of Large Volume Data. and the repeatedly superpotential data that realized generation in the short time are not lost.The trigger port of signal condition unit links to each other with the trigger port of collecting unit, in case the signal condition element keeps track will produce high level to superpotential and notify collecting unit by concentric cable, collecting unit is just gathered according to set acquisition parameter, by pci bus the data that the collect path by appointment is saved on the hard disk of industrial control computer then.

4. industrial control computer

Industrial control computer is a core hardware platform of the present invention, mainly supports the control of superpotential on-line detector to whole testing process.It and application software combine can control collecting unit, write down, store superpotential amplitude, waveform and relevant information in different acquisition controlling modes, can inquire about the data waveform file of having preserved, and carry out the demonstration of any passage waveform and relevant information, realize multiple operation to waveform.This system adopts high-performance brand industrial control computer, stable performance, reliable operation, has good antijamming capability, is furnished with LCD and notebook type keyboard, optical mouse simultaneously.

5. application software

The application software of multiple path transient wave form over voltage of power system on-line measuring device is based on the graphical programming software LabVIEW of America NI instrument company (Laboratory Virtual InstrumentEngineering Workbench) and works out, friendly interface, simple to operate, easy to maintenance.

Application software of the present invention and industrial control computer combine the control of main realization to whole testing process, realization is to the control of collecting unit, to superpotential real-time collection, storage and demonstration and realize realization to functions such as the inquiry of preserving the superpotential historical data, operations.Application software architecture figure of the present invention and process flow diagram are as shown in Figure 4 and Figure 5.

Application software of the present invention mainly is made up of master routine, capture program and three parts of data call program.

Master routine is the window of application software of the present invention, from entering other programs here.Main interface is the door that carries out data acquisition, data call and withdraw from the superpotential on-line detector.Click the corresponding button by left mouse button and just can enter the next stage interface.

Click the corresponding button by left mouse button and just can enter the next stage interface.Left mouse button has just entered data acquisition program after clicking data acquisition button on the superpotential on-line detector master interface.

Capture program is mainly finished to the control of gatherer process with to the superpotential process of catching, storing of pouncing on, and will pounce on the over-voltage waveform of grasping and show in real time.Capture program has comprised acquisition parameter interface and real-time two interfaces of acquisition interface has been set.

In the acquisition parameter design interface, each parameter of be relevant to triggering, gathering is with Be Controlled.Here, triggering mode, input impedance, reference position, triggering threshold, range of signal, sampling rate, sampling depth, all available mouse of superpotential data storing path, keyboard are provided with.After the setting of finishing all acquisition parameters, click confirming button with left mouse button, will enter real-time acquisition interface.

The real-time data acquisition interface will be provided with the set mode in interface by parameter and gather, when tracing into superpotential, will show in real time pounced on grasp over-voltage waveform, and show the information (as acquisition rate, acquisition length, storing path etc.) relevant with this collection.In the real-time data acquisition interface, what the left side showed is to gather some relevant parameters with this, and what the right showed is the data waveform that collects.In three waveform viewing areas from the top down, the right, interface, each district shows two paths, is respectively passage 1 and passage 2, passage 3 and passage 4, passage 5 and passage 6; Wherein the waveform of passage 1, passage 3 and passage 5 shows with sky blue, and the waveform of passage 2, passage 4 and passage 6 shows with mazarine.If click with left mouse button, this collection will finish, and turns back to main interface simultaneously.

The data call interface is equivalent to the oscillographic application interfaces of many inputs, finishes and calls and realize various operations to waveform to what preserve data waveform.The following function of main realization:

1) display channel is set, can selects any passage to show single channel or multichannel

2) call the superpotential historical data, can repeat to call

3) the cursor parameter is set, and the difference of the position of display highlighting and corresponding cursor

4) call the demonstration of data association message, as the acquisition time of these data, acquisition rate etc.

5) stretching of waveform has two kinds of methods to realize: method one, the scale division value knob of rotation X-axis or Y-axis; Method two utilizes the cursor convergent-divergent that stretches.

6) translation of waveform has two kinds of methods to realize: method one, the translation scale of mobile directions X or Y direction correspondence; Method two utilizes cursor to carry out translation.

7) withdraw from the data call interface, and return main interface.

As mentioned above, adopt the present invention carry out the multiple path transient wave form over voltage of power system on-line measuring device can under different acquisition controlling, gather simultaneously multiple power system multiple path transient wave form over voltage on-line measuring device instantaneous in external overvoltage, not only show, store detected over-voltage waveform and relevant information in real time, and can inquire about the superpotential historical data and support the demonstration of any passage waveform and relevant information, can edit the formation document simultaneously.The present invention has realized robotization, the intellectuality of whole service process, and is not only stable, easy to operate, and it is on duty to need not personnel in the operational process.The present invention can record the various superpotential waveform that suffers in the multiple path transient wave form over voltage of power system on-line measuring device truly, has high reliability, strong anti-interference ability and hi-fi, can quantize multiple path transient wave form over voltage of power system on-line measuring device overvoltage level, verify the deviation of superpotential Theoretical Calculation and actual conditions with this, for better Insulation Coordination, revision dielectric level provide reference.

Claims (2)

1. multiple path transient wave form over voltage of power system online test method, adopt high-voltage bleeder, signal condition unit, collecting unit and industrial control computer and application software thereof to constitute the online detection platform of multiple path transient wave form over voltage of power system, it is characterized in that this method may further comprise the steps:
1) voltage signal extraction step: with at least one high-voltage bleeder respectively from the high voltage bus correspondence at random or specify check point to introduce voltage signal; The high-voltage arm capacitor C 1 of high-voltage bleeder is connected with low-voltage arm capacitor C 2, the high pressure input is added in the C1 and the C2 two ends of series connection, output is then extracted from the two ends of low-voltage arm capacitor C 2, and voltage signal is connected respectively to the plurality of voltages signal input part of a signal condition unit by concentric cable behind high-voltage bleeder;
2) signal condition step: adopt the signal condition unit that the voltage signal that extracts is handled, every road signal at first passes through the second divided voltage circuit, one road signal links to each other with the signal input channel of capture card then, another road signal then enters trigger circuit, trigger circuit are the double threshold comparator circuit, when the signal voltage absolute value of input trigger circuit is recorded wave voltage greater than startup, trigger circuit output high level, i.e. trigger circuit action produces trigger pip triggering collection card image data; Otherwise output low level, capture card is not triggered;
3) step of data acquisition: notify collecting unit by concentric cable when the signal condition element keeps track will produce high level to superpotential, collecting unit is just gathered according to set acquisition parameter, by pci bus the data that the collect path by appointment is saved on the hard disk of industrial control computer then;
4) the programmed control step of testing process: the application software control collecting unit by industrial control computer inside writes down, stores superpotential amplitude, waveform and relevant information, the data waveform file that inquiry has been preserved, and carry out the demonstration of any passage waveform and relevant information, realize the multiple operation of waveform and the programmed control of whole testing process.
The program of described application software is worked out by the graphical programming software LabVIEW of America NI company, and program mainly is made up of master routine, capture program and three parts of data call program; Master routine is used to control capture program and data call program; Its workout content is: master routine control capture program and data call program; Capture program is controlled each acquisition parameter, gathers in real time, shows over-voltage waveform, and preserves over-voltage waveform and relevant information to specified path; The support of data call program can be carried out the demonstration of any passage waveform and relevant information to the inquiry of the superpotential historical data of having preserved.
2. realize the device of the described multiple path transient wave form over voltage of power system online test method of claim 1, it is characterized in that it comprises:
More than one high-voltage bleeder is used to introduce voltage signal, and high-voltage bleeder at random or specify and to be distributed on the different check points of high voltage bus is connected respectively to the voltage signal input end of signal condition unit by concentric cable behind capacitance partial pressure;
-signal condition unit, be used for voltage signal is nursed one's health, this conditioning unit mainly comprises second divided voltage circuit and trigger circuit, every road voltage signal at first passes through second divided voltage, one road signal links to each other with the signal input channel of capture card then, another road signal then enters trigger circuit, and trigger circuit produce trigger pip; Described trigger circuit are the double threshold comparator circuit, when the signal voltage absolute value of input trigger circuit is recorded wave voltage greater than startup, and trigger circuit output high level, i.e. trigger circuit action produces trigger pip triggering collection card image data; Otherwise output low level, capture card is not triggered;
-collecting unit, be used for collection to voltage signal, collecting unit is made up of polylith capture card and RTSI bus, the card number of the way decision capture card of signalling channel, a capture card is arranged as main card in collecting unit, other cards are as secondary card, the main card clock passes through the RTSI bus synchronous with secondary card clock, receive acquisition when main card and will notify other secondary cards by the RTSI bus, thereby each capture card is realized synchronous acquisition, and by pci bus the data that the collect path by appointment is saved on the hard disk of industrial control computer;
-industrial control computer, be used for the control of whole testing process, its inside includes the online detection application software of superpotential, write down, store superpotential amplitude, waveform and relevant information in different acquisition controlling modes, can inquire about the data waveform file of having preserved, and carry out the demonstration of any passage waveform and relevant information, realize multiple operation to waveform;
The program of described application software is worked out by the graphical programming software LabVIEW of America NI company, and program mainly is made up of master routine, capture program and three parts of data call program; Master routine is used to control capture program and data call program; Its workout content is: master routine control capture program and data call program; Capture program is controlled each acquisition parameter, gathers in real time, shows over-voltage waveform, and preserves over-voltage waveform and relevant information to specified path; The support of data call program can be carried out the demonstration of any passage waveform and relevant information to the inquiry of the superpotential historical data of having preserved.
CNB2005100417951A 2005-03-14 2005-03-14 On-line detecting method and its device for multiple path transient wave form over voltage of power system CN100370267C (en)

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CN1584607A (en) * 2004-05-31 2005-02-23 席世友 Overvoltage on-line sampler for 6-35 KV electric power system
CN2779413Y (en) * 2004-05-31 2006-05-10 綦南供电局 Online monitoring apparatus for overvoltage of 10KV power system

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