CN104166079A - Method for detecting capacitor element frequency impact current in capacitor voltage transformer - Google Patents

Method for detecting capacitor element frequency impact current in capacitor voltage transformer Download PDF

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Publication number
CN104166079A
CN104166079A CN201410438518.3A CN201410438518A CN104166079A CN 104166079 A CN104166079 A CN 104166079A CN 201410438518 A CN201410438518 A CN 201410438518A CN 104166079 A CN104166079 A CN 104166079A
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CN
China
Prior art keywords
capacity cell
transformer
dash current
capacitor
testing
Prior art date
Application number
CN201410438518.3A
Other languages
Chinese (zh)
Inventor
汲胜昌
班连庚
项祖涛
韩彬
马其燕
李金宇
周佩朋
韩亚楠
杨大业
Original Assignee
国家电网公司
中国电力科学研究院
西安交通大学
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Application filed by 国家电网公司, 中国电力科学研究院, 西安交通大学 filed Critical 国家电网公司
Priority to CN201410438518.3A priority Critical patent/CN104166079A/en
Publication of CN104166079A publication Critical patent/CN104166079A/en

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Abstract

The invention relates to a method for detecting capacitor element frequency impact current in a capacitor voltage transformer. The method comprises the steps of 1 connecting a rectifying circuit and a capacitor element to be detected in parallel; 2 connecting two ends of the capacitor element to be detected to a discharging gap in parallel; 3 adjusting output voltage of the capacitor element to be detected till the discharging gap is broken down; 4 keeping voltage of the transformer to be detected to be constant, and detecting repetition frequency impact current of the capacitor element to be detected; 5 judging whether the capacitor element to be detected meets the requirement or not according to impact current resisting times. The capacitor element is charged through the rectifying circuit, the broken-down gap is re-utilized to perform quick discharge, accordingly impact current with 10 Hz-20 Hz repetition frequency is exerted on the capacitor element, the capacity of resisting the repetition frequency impact current of the capacitor element can be tested, and the method is simple, reliable and easy to execute.

Description

A kind of capacity cell frequency dash current method in Detection capacitance formula voltage transformer (VT)
Technical field
The present invention relates to the method for power equipment repetition frequency impulse current test, specifically relate to a kind of capacity cell frequency dash current method in Detection capacitance formula voltage transformer (VT).
Background technology
Series Compensation has started to be applied to extra-high-voltage alternating current system.
1000kV series compensation device mainly comprises series compensation device platform, bypass breaker, bypass isolating switch, series connection disconnector, referred to as the capacitance type potential transformer (capacitor voltage transformer) of CVT and support insulator etc.Wherein each part plays respectively different vital role in system operation: for example disconnector and isolating switch are used for switching the various methods of operation of series compensation platform; CVT is in order to Monitoring Line and series compensation platform voltage, and provides voltage signal for protective relaying device.
Yet between series compensation platform operation limber up period, during switching extra-high voltage series compensation platform, there is intermittent electric arc in disconnector on charged bus between contact, as the monitoring equipment of voltage in series compensation platform---easily there is Insulation Problems in CVT.
With the unloaded bus of isolator operation or charged bus-bar system, it is the operation back brake of a kind of common form of high voltage substation.So, in operation, between the contact of disconnector, there will be indirect arc, and in single job, repeatedly extinguish, restrike.And disconnector switching fixed series capacitors compensation is a kind of more special operation format, current probe into mainly for be that in switching process, string is mended the superpotential of device internal capacitor group and the acting characteristic of protection system; In switchgear, electric arc is also only confined in the side isolating switch in parallel with capacitor group the impact of system.In high-pressure system, the dielectric level of equipment general high, insulation margin is large, the superpotential, the excess current that during isolator operation, cause are almost safe from harm to power equipment, what mainly consider is the impact of space electromagnetic coupled on electrical secondary system, therefore the impact of a relevant power equipment is not had to relevant report.Yet in extra-high voltage system, apparatus insulated nargin is relatively little, and transient overvoltage has a strong impact on primary equipment state of insulation; In addition, for extra-high voltage fixed condenser group series compensation device, switching overvoltage and excess current that its specific wiring construction and operating process cause also have its singularity.
In extra-high voltage series connection compensation system, the singularity of switching overvoltage and excess current easily causes the insulation fault of CVT wherein.To a large amount of inspections of the disintegration of CVT and occur that the labor of the accident of Insulation Problems finds, the main cause that in CVT, capacity cell breaks down when disconnector switching is: because the biasing of capacity cell welding position causes charging current, concentrate, this electric power just having increased while flowing through repetition frequency dash current in its charge and discharge process is concentrated, cause the loose contact of aluminium foil and pad, and then the electric discharge of the current potential official post weld flashing between the aluminium foil causing under repetition frequency electric current; In addition, inner at capacity cell, because the vibration of element that repetition frequency dash current causes is inhomogeneous, cause element internal electric field to be concentrated, thereby make the edge of foil electrode that insulation breakdown easily occur.
Yet, because the compensation of disconnector switching fixed series capacitors is more special operation, need to provide the method for capacity cell tolerance repetition frequency dash current ability in a kind of CVT of detection.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of capacity cell frequency dash current method in Detection capacitance formula voltage transformer (VT).Can effectively solve the examination problem of CVT capacity cell tolerance repetition dash current ability, thereby can the insulating property under repetition dash current test capacity cell, determine insulation tolerance, ensure the safe and reliable operation of CVT.
The object of the invention is to adopt following technical proposals to realize
A capacity cell frequency dash current method in Detection capacitance formula voltage transformer (VT), its improvements are, described method comprises
(1) rectification circuit is in parallel with testing capacitance element;
(2) testing capacitance element two ends parallel spark gap;
(3) regulate transformer output voltage to be measured until discharging gap punctures;
(4) maintain transformer voltage to be measured constant under, measure testing capacitance element repetition frequency dash current;
(5) by withstand shock electric current number of times, judge whether testing capacitance element meets the requirements.
Preferably, described step (1) comprises atmospheric side capacity cell in parallel with the half-wave rectifying circuit that power frequency testing transformer, protective resistance and silicon stack form.
Preferably, described step (2) is included in the discharging gap of testing capacitance element two ends excellent bar electrode structure in parallel.
Preferably, described step (3) comprises that regulating transformer output voltage to be measured is capacity cell charging, until discharging gap punctures.
Preferably, described step (4) comprises that to maintain transformer output voltage to be measured constant, forming the cyclic process that capacity cell charges, discharging gap punctures, is the repetition frequency dash current under 10~20Hz for detection of capacity cell in capacitance type potential transformer in repetition frequency.
Preferably, the number of times of the described withstand shock electric current of described step (5) is over 2400 times.
Preferably, by described testing capacitance element, half-wave rectifying circuit and excellent discharging gap, compose in parallel loop to be measured.
Further, described power frequency testing transformer rated voltage is 100kV; Described protective resistance is that industrial frequency experiment becomes protective resistance, resistance 100k Ω; Described silicon stack is high voltage silicon rectifier stack.
Further, described excellent bar electrode structure is excellent bar structure discharging gap, and clearance distance is 2mm; Described testing capacitance element is that 4 tested CVT capacity cells are composed in series; Measuring coil is Rogowski coil, and measurement sensitivity is 10mV/A.
Compared with the prior art, beneficial effect of the present invention is:
The present invention charges to capacity cell by rectification circuit, rapid discharge is carried out in the gap that recycling punctures, thereby capacity cell is applied to the dash current of repetition frequency 10~20Hz, the ability that can tolerate repetition frequency dash current to it is tested, the simple and reliable easy execution of method.
Accompanying drawing explanation
Fig. 1 is capacity cell frequency dash current method flow diagram in a kind of Detection capacitance formula voltage transformer (VT) provided by the invention.
Fig. 2 is capacity cell frequency dash current method test loop schematic diagram in a kind of Detection capacitance formula voltage transformer (VT) provided by the invention.
Fig. 3 is the single pulse current waveform figure that flows through tested CVT capacity cell provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Concrete technical scheme of the present invention is:
1, tested capacity cell is connected in parallel on to the half-wave rectifying circuit two ends that power frequency testing transformer, protective resistance and silicon stack form;
2, the excellent discharging gap in parallel at tested capacity cell two ends, thereby the test loop of complete;
3, slowly regulating the output voltage of testing transformer, is the charging of tested capacity cell gradually, until the discharging gap in parallel with capacity cell can sustained breakdown;
4, maintain the output voltage of testing transformer constant, thereby in test loop, form the cyclic process that capacity cell charging, discharging gap puncture, realize thus the repetition frequency impulse current test to CVT capacity cell, repetition frequency is 10~20Hz.
5, the appraisal standards of CVT capacity cell tolerance repetition dash current ability are: if the number of times of capacity cell withstand shock electric current surpasses 2400 times, this capacity cell test is passed through, otherwise test is not passed through.
The method that the present invention punctures by the gap continuous discharge in parallel with capacity cell, realize CVT capacity cell Continuous-flow and cross repetition frequency 10~20Hz dash current, thereby the ability of the repetition frequency dash current that can cause due to isolated operation CVT capacity cell tolerance in series compensation platform is examined, and ensures the safe and reliable operation of CVT.
As shown in Figure 2, the repetition frequency impulse current test loop schematic diagram of CVT capacity cell, wherein:
Vs power frequency testing transformer, rated voltage is 100kV;
RS is that industrial frequency experiment becomes protective resistance, and resistance is 100k Ω;
D is high voltage silicon rectifier stack;
S is discharging gap, excellent bar structure, and clearance distance is 2mm;
C is tested CVT capacity cell, is that 4 capacitor cells are composed in series;
Measuring coil is Rogowski coil, and measurement sensitivity is 10mV/A.
Embodiment
The repetition frequency impulse current test embodiment of the method for the CVT capacity cell that as shown in Figure 1, the present invention proposes describes in detail and comprises the steps:
Step 1: tested capacity cell is connected in parallel on to the half-wave rectifying circuit two ends that power frequency testing transformer, protective resistance and silicon stack form;
Step 2: as shown in Figure 2, at tested capacity cell two ends parallel spark gap, thus the test loop of complete;
Step 3: slowly regulate the output voltage of testing transformer, be gradually capacity cell charging, until the discharging gap in parallel with capacity cell can sustained breakdown;
Step 4: the output voltage that maintains testing transformer is constant, thus the cyclic process that capacity cell charges, discharging gap punctures in test loop, formed, realize thus the repetition frequency impulse current test to CVT capacity cell.
Step 5: the repetition frequency impulse current test of evaluating CVT capacity cell: if the number of times of capacity cell withstand shock electric current surpasses 2400 times, this capacity cell test is passed through, otherwise test is not passed through.
In described step 1, it is 100kV that industrial frequency experiment becomes rated voltage; Protective resistance resistance is 100k Ω;
In described step 2, discharging gap in parallel is excellent bar electrode structure, and clearance distance is 2mm;
In described step 3, slowly regulate the speed of testing transformer output voltage to be controlled at 5kV/s;
In described step 4, the output voltage of testing transformer maintains 80kV, and as shown in Figure 3, repetition frequency is 20Hz to the single-impact current waveform that flows through tested capacity cell now forming.
In described step 5, test product is carried out to repetitive shock electric current 2min, that is: the number of times of withstand shock electric current is 2400 times, and in process of the test, capacity cell flashover does not occur or punctures, and thinks stand the test.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (9)

1. a capacity cell frequency dash current method in Detection capacitance formula voltage transformer (VT), is characterized in that, described method comprises
(1) rectification circuit is in parallel with testing capacitance element;
(2) testing capacitance element two ends parallel spark gap;
(3) regulate transformer output voltage to be measured until discharging gap punctures;
(4) maintain transformer voltage to be measured constant under, measure testing capacitance element repetition frequency dash current;
(5) by withstand shock electric current number of times, judge whether testing capacitance element meets the requirements.
2. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1; it is characterized in that, described step (1) comprises atmospheric side capacity cell in parallel with the half-wave rectifying circuit that power frequency testing transformer, protective resistance and silicon stack form.
3. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1, is characterized in that, described step (2) is included in the discharging gap of testing capacitance element two ends excellent bar electrode structure in parallel.
4. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1, is characterized in that, described step (3) comprises that regulating transformer output voltage to be measured is capacity cell charging, until discharging gap punctures.
5. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1, it is characterized in that, described step (4) comprises that to maintain transformer output voltage to be measured constant, forming the cyclic process that capacity cell charges, discharging gap punctures, is the repetition frequency dash current under 10~20Hz for detection of capacity cell in capacitance type potential transformer in repetition frequency.
6. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1, is characterized in that, the number of times of the described withstand shock electric current of described step (5) is over 2400 times.
7. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 1, is characterized in that, by described testing capacitance element, half-wave rectifying circuit and excellent discharging gap, composes in parallel loop to be measured.
8. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 2, is characterized in that, described power frequency testing transformer rated voltage is 100kV; Described protective resistance is that industrial frequency experiment becomes protective resistance, resistance 100k Ω; Described silicon stack is high voltage silicon rectifier stack.
9. capacity cell frequency dash current method in a kind of Detection capacitance formula voltage transformer (VT) as claimed in claim 3, is characterized in that, described excellent bar electrode structure is excellent bar structure discharging gap, and clearance distance is 2mm; Described testing capacitance element is that 4 tested CVT capacity cells are composed in series; Measuring coil is Rogowski coil, and measurement sensitivity is 10mV/A.
CN201410438518.3A 2014-08-29 2014-08-29 Method for detecting capacitor element frequency impact current in capacitor voltage transformer CN104166079A (en)

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CN105589052A (en) * 2016-01-25 2016-05-18 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitance on-line monitoring method based on zero sequence voltage monitoring
CN109904847A (en) * 2019-01-23 2019-06-18 西安交通大学 A kind of plural serial stage discharging gap and its working method with selecting frequency characteristic
CN110426573A (en) * 2019-07-24 2019-11-08 国网湖南省电力有限公司 A kind of lightning protection anti-ice-flashover composite insulator on-line monitoring method

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* Cited by examiner, † Cited by third party
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CN105589052A (en) * 2016-01-25 2016-05-18 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitance on-line monitoring method based on zero sequence voltage monitoring
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CN109904847A (en) * 2019-01-23 2019-06-18 西安交通大学 A kind of plural serial stage discharging gap and its working method with selecting frequency characteristic
CN110426573A (en) * 2019-07-24 2019-11-08 国网湖南省电力有限公司 A kind of lightning protection anti-ice-flashover composite insulator on-line monitoring method

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