CN101726675B - Method for performing live-line evaluation on online insulation monitoring system of substation - Google Patents
Method for performing live-line evaluation on online insulation monitoring system of substation Download PDFInfo
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- CN101726675B CN101726675B CN2008101725046A CN200810172504A CN101726675B CN 101726675 B CN101726675 B CN 101726675B CN 2008101725046 A CN2008101725046 A CN 2008101725046A CN 200810172504 A CN200810172504 A CN 200810172504A CN 101726675 B CN101726675 B CN 101726675B
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Abstract
The invention provides a method for performing live-line evaluation on an online insulation monitoring system of a substation, which comprises the following steps of: (1) obtaining the leakage current I of capacitive equipment and a lightning protector through a straight-through mutual inductor capable of directly obtaining current; (2) performing orthogonal conversion on the current output by the second output end of the straight-through mutual inductor capable of directly obtaining the current through an orthogonal conversion circuit; (3) inputting a signal obtained by the orthogonal conversion into a programmable gain amplification circuit; (4) outputting an excitation current signal Delta I output by the programmable gain amplification circuit to an external leakage current monitoring transformer in a straight-through way; and (5) changing the gain of the programmable gain amplification circuit and comparing an insulation characteristic quantity change detected by the online insulation monitoring system of the substation with an actual insulation characteristic quantity change. The method can securely evaluate the working condition of the online insulation monitoring system for the capacitive equipment and the lightning protector under the condition that the substation works.
Description
Technical field
The present invention relates to a kind of method of assessing insulation on-line monitoring system of substation, relate in particular to a kind of method of charged assessment insulation on-line monitoring system of substation.
Background technology
Because there is limitation in electrical equipment preventive test, under POWER SYSTEM STATE maintenance megatrend, the electrical equipment online monitoring system is widely used, and capacitive apparatus, lightning arrester insulation on-line monitoring system are the branches of electrical equipment online monitoring system.Capacitive apparatus, lightning arrester insulation on-line monitoring system are by monitoring capacitive apparatus Leakage Current Ic, lightning arrester Leakage Current I
RAnd the PT that is associated (voltage transformer (VT)) secondary measurement winding voltage (this secondary measurement winding voltage reflects primary side voltage in the error allowed band), obtain Leakage Current In, primary voltage U and angle of cut θ by FFT (fast Flourier) algorithm computation, wherein, as shown in Figure 1, the phase place of described angle of cut θ phase place that is primary voltage U and Leakage Current In is poor.
As shown in Figure 2, be capacitive apparatus, lightning arrester equivalent model, because the existence of resistive component is arranged, the angle of cut of the angle of cut of capacitive apparatus Leakage Current and primary voltage, lightning arrester Leakage Current and primary voltage is all less than 90 degree, and the δ that marks among definition Fig. 1 is dielectric loss angle (described dielectric loss angle is a dielectric features amount), the I that marks among definition Fig. 1
RBe current in resistance property δ (described current in resistance property δ is a dielectric features amount).When there was insulation hidden danger in capacitive apparatus, it is big that dielectric loss angle δ will become; When there is insulation hidden danger in lightning arrester, current in resistance property I
RTo become big, at this moment, insulated on-line monitoring equipment should be caught the variation of dielectric features amount in real time, in time reports to the police.
Along with the fast development of electronic system, Digital Signal Processing, in order to strengthen the interference free performance of electric system, simulating signal digitizing has nearby become the main flow of design insulated on-line monitoring system.In actual engineering, as shown in Figure 3, utilize punching sensor sampling capacitive apparatus Leakage Current, lightning arrester Leakage Current and PT metering winding voltage signal, digitizing nearby respectively, rebuild the sinusoidal waveform figure of In and the sinusoidal waveform figure of U according to sampled data, try to achieve phase differential between In and the U by the waveform parameter of the waveform parameter of In and U again, thereby obtain dielectric loss angle.
At present domestic at after capacitive apparatus, the on-the-spot installation of lightning arrester insulation on-line monitoring system, assess the validity of this system monitoring, and the validity of this system monitoring behind the long-play, as shown in Figure 4, the method of taking is: behind capacitive apparatus, screen ground wire two ends, lightning arrester end and connecting resistance, separate end, Kaiyuan screen ground wire, be equivalent to power resistor of serial connection in former loop.Change the size of dielectric features amount by series resistor, and observe the variation whether on-line monitoring system can correctly reflect the dielectric features amount.But said method is abnormally dangerous, disconnects in case primary equipment end screen grounding ports and the earth are unexpected, and end screen port will form high pressure, the serious threat person, device security.In addition,, there is the possibility of monitoring equipment faults itself, therefore, needs to differentiate fault type, location primary equipment fault or monitoring equipment fault when capacitive apparatus, when the lightning arrester insulation online monitoring data is unusual.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of method of charged assessment insulation on-line monitoring system of substation, can safely the working condition of capacitive apparatus, lightning arrester insulation on-line monitoring system be assessed under the situation of transformer station's work.
In order to achieve the above object, the invention provides a kind of method of charged assessment insulation on-line monitoring system of substation, it may further comprise the steps:
(1) by the punching mutual inductor acquisition capacitive apparatus that can directly obtain electric current, the Leakage Current I of lightning arrester;
(2), the described electric current that can directly obtain the punching mutual inductor secondary output terminal output of electric current is carried out orthogonal transformation by orthogonal intersection inverter;
(3) with the input of the signal after orthogonal transformation programme-controlled gain amplifying circuit, control the gain of described programme-controlled gain amplifying circuit by control circuit;
(4) the exciting current signal delta I punching with described programme-controlled gain amplifying circuit output outputs to external leakage current monitoring mutual inductor;
(5) by changing the controlled variable of control circuit, change the gain of described programme-controlled gain amplifying circuit, and relatively the detected dielectric features of insulation on-line monitoring system of substation quantitative changeization changes with the actual insulation characteristic quantity.
The method of charged assessment insulation on-line monitoring system of substation of the present invention, wherein, the described punching mutual inductor that can directly obtain electric current is a clamp on amperemeter.
The method of charged assessment insulation on-line monitoring system of substation of the present invention, wherein, step (2) comprising:
(21) with the described electric current that can directly obtain the punching mutual inductor secondary output terminal output of electric current, power input amplifying circuit;
(22), the signal process of described power amplification circuit output is carried out orthogonal transformation by orthogonal intersection inverter.
The method of charged assessment insulation on-line monitoring system of substation of the present invention, wherein, described step (4) comprising:
(41) the exciting current signal delta I to described programme-controlled gain amplifying circuit output carries out current stabilization;
(42) the exciting current signal delta I punching behind the current stabilization is outputed to external leakage current monitoring mutual inductor.
Compared with prior art, the method of charged assessment insulation on-line monitoring system of substation of the present invention, by adopting the punching mutual inductor that directly to obtain electric current, and can under the situation of transformer station work, obtain the Leakage Current of capacitive apparatus, lightning arrester, and avoided needing in the prior art situation that ground wire disconnects is shielded at the equipment end, thereby make that the situation of formation high pressure can not take place with the earth disconnection beyond the screen grounding ports of described equipment end, the security that the method that guaranteed is implemented.
Description of drawings
Fig. 1 is the dielectric features signal vector figure;
Fig. 2 is capacitive apparatus, lightning arrester equivalent model figure;
Fig. 3 is the circuit diagram of capacitive apparatus, lightning arrester insulation online monitoring system;
Fig. 4 is the circuit diagram that is used to assess the circuit of capacitive apparatus, lightning arrester insulation online monitoring system in the prior art;
Fig. 5 is the method for charged assessment of the present invention transformer station capacitive apparatus, lightning arrester insulation on-line monitoring system, based on the circuit diagram of charged apparatus for evaluating;
Fig. 6 A is Leakage Current and the exciting current punching synoptic diagram by monitoring sensor;
Fig. 6 B, Fig. 6 C are dielectric features signal stack synoptic diagram;
Fig. 7 is a charged process flow diagram of assessing the method for transformer station's capacitive apparatus, lightning arrester insulation on-line monitoring system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical characterictic and the advantage above-mentioned and other to the present invention are described in more detail.
The invention provides a kind of charged method of assessing transformer station's capacitive apparatus, lightning arrester insulation on-line monitoring system, it is based on a kind of charged apparatus for evaluating.
As shown in Figure 5, a kind of concrete enforcement of described charged apparatus for evaluating comprises clamp on amperemeter 11, I/V translation circuit 12, orthogonal intersection inverter 13, programme-controlled gain amplifying circuit 14, microprocessor 15 and V/I circuit 16, wherein:
Clamp on amperemeter is to be combined by current transformer and reometer, and the iron core of current transformer can open when clutching spanner; The lead that tested electric current passed through can cut off just can pass open breach unshakable in one's determination, when decontroling spanner back core closure; Passing circuit-under-test lead unshakable in one's determination just becomes the primary winding of current transformer.
Therefore the inventive method based on charged apparatus for evaluating in, current transformer in the employing clamp on amperemeter 11 converts the Leakage Current I of capacitive apparatus, lightning arrester to I1 and output, and, when practical operation, because the first siding ring number of turn of current transformer is seldom, general lead just, secondary is sidelong a lot of circle coils, like this, on the angle of energy conservation, the current amplitude in the second siding ring can be little more a lot of than the current amplitude in the first siding ring.
And because the current amplitude of described clamp on amperemeter 11 outputs is little, therefore the power of its output is also little, directly do not drive orthogonal intersection inverter 13, need be with the power amplification of described clamp on amperemeter 11 outputs, therefore, the secondary output terminal of described clamp on amperemeter 11 will be input to described I/V translation circuit 12 through the less electric current I1 after the conversion, and described I/V translation circuit 12 outputs obtain voltage signal U1.
Described clamp on amperemeter 11 also can be other the punching mutual inductor that can directly obtain electric current.
Wherein, described I/V translation circuit 12 is actual, and what play is the effect of power amplification circuit, and therefore, described I/V translation circuit 12 also can replace with other the circuit with power amplifier function.
Described orthogonal intersection inverter 13 is used for voltage signal U1 is carried out orthogonal transformation, obtains voltage signal U2, and described orthogonal intersection inverter 13 can adopt differentiating circuit.The input end of the output terminal of described orthogonal intersection inverter 13 and described programme-controlled gain amplifying circuit 14.
Each gain control end of described programme-controlled gain amplifying circuit 14 is connected with each port of described microprocessor 15 respectively; The selection of the high-low level by described microprocessor 15 each port, and control the gain amplifier of described programme-controlled gain amplifying circuit 14.Described programme-controlled gain amplifying circuit 14 amplifies voltage signal U2 output voltage signal U3 according to this gain amplifier.
Wherein, described microprocessor 15 plays the effect of the gain amplifier of the described programme-controlled gain amplifying circuit 14 of control, also can replace with other forms of control circuit.
The input end of described V/I translation circuit 16 is connected with the output terminal of described programme-controlled gain amplifying circuit 14, described V/I translation circuit 16 is converted to exciting current Δ I with described voltage signal U3, when described charged apparatus for evaluating needs assessment on-line monitoring system, exciting current Δ I punching is outputed to external leakage current monitoring mutual inductor.
Wherein, what described V/I translation circuit 16 played is the effect of current stabilization, and therefore described V/I translation circuit 16 also can replace with other the circuit with current stabilization effect.
After described charged apparatus for evaluating is applied to be evaluated at line monitoring system, as shown in Figure 6A, Leakage Current I and exciting current Δ I punching flow through external leakage current monitoring mutual inductor, at this moment, described external leakage current monitoring transformer induced to signal be described Leakage Current I and described exciting current Δ I vector and, because the angle of cut between described exciting current Δ I and the described Leakage Current I is 90 degree, and the described relatively Leakage Current I of described exciting current Δ I is very little, therefore, as Fig. 6 B, shown in Fig. 6 C, change the size of described exciting current Δ I, with change described exciting current Δ I and described Leakage Current I vector and, also will change the angle of cut θ between this vector and the primary voltage U, thereby also can change dielectric features amount δ, I
RTherefore, change the gain amplifier of described programme-controlled gain amplifying circuit 14, can change the size of exciting current Δ I, thereby can change dielectric features amount δ, I by the control signal that changes described control circuit 15
R, at this moment whether can correctly reflect the dielectric features variable quantity by observing on-line monitoring system, just can be evaluated at the working condition of line monitoring system.
As shown in Figure 7, the method for charged assessment insulation on-line monitoring system of substation of the present invention may further comprise the steps:
Step 71: the Leakage Current I that obtains capacitive apparatus, lightning arrester by the punching mutual inductor that can directly obtain electric current;
According to a kind of embodiment, the described punching mutual inductor that can directly obtain electric current is a clamp on amperemeter;
Step 72: with the described electric current that can directly obtain the punching mutual inductor secondary output terminal output of electric current, power input amplifying circuit;
Step 73:, the signal process of described power amplification circuit output is carried out orthogonal transformation by orthogonal intersection inverter;
Step 74:, control the gain of described programme-controlled gain amplifying circuit by control circuit with the input of the signal after orthogonal transformation programme-controlled gain amplifying circuit;
Step 75: the exciting current signal delta I to described programme-controlled gain amplifying circuit output carries out current stabilization;
Step 76: the exciting current signal delta I punching behind the current stabilization is outputed to external leakage current monitoring mutual inductor;
Step 77: by changing the controlled variable of control circuit, change the gain of described programme-controlled gain amplifying circuit, and relatively the detected dielectric features of insulation on-line monitoring system of substation quantitative changeization changes with the actual insulation characteristic quantity.
Based on the described charged apparatus for evaluating of the foregoing description, a kind of concrete enforcement of method of the present invention is described in detail as follows:
Obtain the Leakage Current I of capacitive apparatus, lightning arrester by clamp on amperemeter 11, and the electric current of described clamp on amperemeter 11 secondary output terminals is input to I/V translation circuit 12, obtain voltage signal U1;
By orthogonal intersection inverter 13, described voltage signal U1 is carried out orthogonal transformation, obtain voltage signal U2;
Again described voltage signal U2 is linked into programme-controlled gain amplifying circuit 14;
Output control signals to described programme-controlled gain amplifying circuit 14 by microprocessor 15, to control the gain amplifier of described programme-controlled gain amplifying circuit 14;
By the V/I translation circuit, will be converted to exciting current Δ I from the signal of described programme-controlled gain amplifying circuit 14 output terminals, described exciting current Δ I punching outputs to external leakage current monitoring mutual inductor;
By changing the level of described each control port of microprocessor, change the gain of described programme-controlled gain amplifying circuit, and relatively capacitive apparatus, the detected dielectric features of lightning arrester insulation on-line monitoring system quantitative changeization change with the actual insulation characteristic quantity; If observe the variation that capacitive apparatus, lightning arrester insulation on-line monitoring system can correctly reflect the dielectric features amount, then can assess described capacitive apparatus, the lightning arrester insulation on-line monitoring system is working properly; Otherwise, described capacitive apparatus, lightning arrester insulation on-line monitoring system fault.
More than explanation is just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skills understand, under the situation of the spirit and scope that do not break away from claim of the present invention and limited; can make many modifications, variation or equivalence, but all will fall within the scope of protection of the present invention.
Claims (3)
1. the method for a charged assessment insulation on-line monitoring system of substation is characterized in that, may further comprise the steps:
(1) by the punching mutual inductor acquisition capacitive apparatus that can directly obtain electric current, the leakage current I of lightning arrester;
(2) by orthogonal intersection inverter, the electric current that described punching mutual inductor secondary output terminal is exported carries out orthogonal transformation;
(3) with the input of the signal after orthogonal transformation programme-controlled gain amplifying circuit, control the gain of described programme-controlled gain amplifying circuit by control circuit;
(4) the exciting current signal delta I punching with described programme-controlled gain amplifying circuit output outputs to external leaks current monitoring mutual inductor;
(5) by changing the controlled variable of described control circuit, change the gain of described programme-controlled gain amplifying circuit, and relatively the detected dielectric features of insulation on-line monitoring system of substation quantitative changeization changes with the actual insulation characteristic quantity;
Described step (2) specifically comprises:
(21) with the described electric current that can directly obtain the punching mutual inductor secondary output terminal output of electric current, power input amplifying circuit;
(22) by orthogonal intersection inverter, the signal that described power amplification circuit is exported carries out orthogonal transformation.
2. the method for charged assessment insulation on-line monitoring system of substation according to claim 1 is characterized in that: the described punching mutual inductor that can directly obtain electric current is a clamp on amperemeter.
3. the method for charged assessment insulation on-line monitoring system of substation according to claim 1 is characterized in that, described step (4) comprising:
(41) the exciting current signal delta I to described programme-controlled gain amplifying circuit output carries out current stabilization;
(42) the exciting current signal delta I punching behind the current stabilization is outputed to external leaks current monitoring mutual inductor.
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| CN2008101725046A CN101726675B (en) | 2008-10-28 | 2008-10-28 | Method for performing live-line evaluation on online insulation monitoring system of substation |
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| CN2008101725046A CN101726675B (en) | 2008-10-28 | 2008-10-28 | Method for performing live-line evaluation on online insulation monitoring system of substation |
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| CN101726675B true CN101726675B (en) | 2011-11-30 |
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Families Citing this family (11)
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| CN102288804B (en) * | 2011-07-20 | 2014-07-30 | 南京世都科技有限公司 | Method for calculating resistive current of arrester based on orthogonal transformation |
| CN103592497A (en) * | 2013-11-12 | 2014-02-19 | 安徽一天电气技术有限公司 | Broadband voltage collector |
| CN104062619B (en) * | 2014-07-09 | 2017-01-25 | 国家电网公司 | Verification system for on-line monitoring device of double-signal-source capacitive equipment |
| CN106370909B (en) * | 2015-07-24 | 2018-11-09 | 中国电力科学研究院 | A kind of power circuit leakage current analysis method |
| CN105044524B (en) * | 2015-08-10 | 2018-12-04 | 许继集团有限公司 | A kind of arrester monitoring method and system suitable for intelligent substation |
| CN105259449A (en) * | 2015-11-04 | 2016-01-20 | 国网浙江省电力公司电力科学研究院 | System for evaluating state of EHV (extra-high voltage) lightning arrester |
| CN107576900B (en) * | 2017-05-07 | 2019-08-23 | 安徽优旦科技有限公司 | A kind of electric car full voltage platform Insulation Inspection System |
| CN112305348A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment |
| CN112305352A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Voltage reconstruction MOA resistive current testing method based on in-phase capacitive equipment |
| CN112305349A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current rapid measurement method |
| CN112305351A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current measuring method for leakage current reconstruction voltage |
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