CN103869168A - Detecting and diagnosing method for secondary circuit of current transformer for electric power - Google Patents

Detecting and diagnosing method for secondary circuit of current transformer for electric power Download PDF

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Publication number
CN103869168A
CN103869168A CN201410095141.6A CN201410095141A CN103869168A CN 103869168 A CN103869168 A CN 103869168A CN 201410095141 A CN201410095141 A CN 201410095141A CN 103869168 A CN103869168 A CN 103869168A
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CN
China
Prior art keywords
admittance
current transformer
secondary circuit
loop
high frequency
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN201410095141.6A
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Chinese (zh)
Inventor
许守东
李胜男
丁心志
周鑫
刘柱揆
郭成
马红昇
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
Original Assignee
Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Application filed by Yunnan Power Grid Corp Technology Branch, Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute filed Critical Yunnan Power Grid Corp Technology Branch
Priority to CN201410095141.6A priority Critical patent/CN103869168A/en
Publication of CN103869168A publication Critical patent/CN103869168A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a detecting and diagnosing method for a secondary circuit of a current transformer for electric power. A handheld mobile high-frequency admittance device is used for detecting the secondary circuit of the current transformer. The detecting and diagnosing method comprises the following steps: firstly, serially connecting a test loop with the secondary circuit of the current transformer; injecting a 1.4-1.5KHz current signal into the test loop; measuring an admittance value of the secondary circuit of the whole current transformer; adopting an assessing method combining a horizontal comparison mode with a horizontal comparison mode for analyzing an equivalent circuit of the current transformer and the impedance of the secondary circuit, thereby judging if the shunting of the secondary circuit of the current transformer, the poor contact of a secondary terminal, the inter-turn insulation breakdown of the secondary winding of the current transformer, and the like, are abnormal, and supplying an effective measure for detecting the failure cause. The detecting and diagnosing method for the secondary circuit of the current transformer for the electric power has the remarkable advantages of simpleness, reliability and wide application scope.

Description

A kind of electric power Current Transformer secondary circuit is surveyed and diagnostic method
Technical field
The invention belongs to power equipment electrical test technical field, be applicable to, under equipment stoppage in transit or the state that puts into operation, the admittance of electric system secondary loop of mutual inductor be surveyed, and then diagnosis secondary loop of mutual inductor.
Background technology
In recent years, no matter electric system is new throwing or the various incipient fault hidden danger of the normal appearance of operation plant stand electric current secondary loop, the accident that causes the error action of device such as relay protection or tripping to cause constantly occurs.For avoid finding in time and to be processed caused loss as far as possible, secondary loop of mutual inductor fault distinguishing method based on high frequency admittance has been proposed, it studies confirm that the fault of secondary loop of mutual inductor all shows as the variation of the admittance in this loop (or impedance), can reach by the monitoring of the high frequency admittance to loop the object of fault analysis.
Along with the birth of various advanced persons' of modern times telecommunication technique, remote control technology also obtains develop rapidly thereupon.Admittance measurement method and remote control technology are incorporated into one, thereby realize long-range, the on-line monitoring of fault that secondary loop of mutual inductor is comprehensively dived in operational process.In addition, can carry out off-line detection to tank admittance, and in several ways test data be assessed, can be more comprehensive effectively to the analysis judgement of the working condition of electric system current transformer and secondary loop of mutual inductor.And the secondary loop of mutual inductor of prior art inspection way needs tested equipment at shut down condition, required testing apparatus is various and wiring is complicated, and investment is large, and security risk is high.
Can see that the present invention proposes based on actual demand, can provide safeguard to the correctness of the secondary circuit of the running status of current transformer, current transformer by tank admittance sniffer, only has the technological means of passing through, the clear and definite admittance in loop, can make that secondary circuit diagnostic techniques has more extensively, application more accurately.
Summary of the invention
A kind of electric power Current Transformer secondary circuit is surveyed and diagnostic method, specifically checks way about the another kind of secondary loop of mutual inductor.
A kind of electric power Current Transformer secondary circuit detection method is: adopt the admittance change in the high frequency admittance device probe current mutual inductor off-line secondary loop of hand-hold movable, determine the correctness of secondary loop of mutual inductor, by taking the actual admittance value of online probe current transformer secondary circuit and comparing of basic admittance value, can control in advance the trend of secondary loop of mutual inductor to Abnormal Development, as: turn-to-turn short circuit, secondary terminals loose contact, secondary winding in current transformer turn-to-turn insulation puncture, seal in principle according to secondary loop of mutual inductor, utilize shorting stub or short in flakes by tested loop screen cabinet terminal row outer terminal short circuit, high frequency admittance detector is sealed in behind its loop, open secondary current again, carry out secondary circuit admittance detection, high frequency admittance device frequency range is: 1.4kHz-1.5kHz, the syndeton of the tank admittance sniffer of this method is: CT secondary side A end is connected to high frequency admittance detector input end B point, be connected to the exclusive side D point of terminal in CT terminal box through high frequency admittance detector output terminal C point, terminal box E point is connected with protection screen F point, protection screen G point is connected with CT non-polar end H point, make CT secondary circuit form closed loop, as shown in Figure 1.
The diagnostic method obtaining according to the present invention is :in same secondary circuit homophase situation, the admittance data Y2 variation of historical high frequency admittance data Y1 and up-to-date test is compared, in the time of Y2>=1.3 × Y1 or Y2≤0.7 × Y1, this breaks down mutually can to judge CT or CT secondary circuit, in same secondary circuit three-phase in arbitrary phase high frequency admittance measurement data>=three-phase 1.3 times of other two-phase high frequency admittance measurement data mean values time, can judge that CT or CT secondary circuit break down, in same secondary circuit three-phase in arbitrary phase high frequency admittance measurement data≤three-phase 0.7 times of other two-phase high frequency admittance measurement data mean values time, can judge that CT or CT secondary circuit break down.
The object of the invention is to break the limitation of traditional detection, directly, by detection circuit admittance, current transformer and secondary circuit have been diagnosed.
The present invention realizes by following technical proposal.
The admittance detector of hand-hold movable seals in secondary loop of mutual inductor by p-wire, allow Current Transformer Secondary side power current normally pass through, then in test loop, inject the current signal of 1.4-1.5KHz, this signal is superimposed upon on power frequency component and forms loop through secondary, by calculating the admittance value of high frequency, this value has been adopted to comparatively ripe across comparison (threephase current transformer of one group of current transformer and same current transformer loop contrasts) and longitudinal way of contrast (current transformer of the same charging operation of periodic observation, observation has or not significant change) combination evaluation measures, judge the operating mode of secondary loop of mutual inductor, thereby secondary loop of mutual inductor is shunted, secondary terminals loose contact, the various abnormal conditions such as secondary winding in current transformer turn-to-turn insulation punctures are made qualitative analysis, for looking up the fault reason provides effective means.
Further set forth content of the present invention below in conjunction with drawings and Examples.
Brief description of the drawings
Fig. 1 is tank admittance sniffer test philosophy figure;
Fig. 2 is secondary loop of mutual inductor fault analysis schematic diagram;
Fig. 3: certain transforming plant main transformer medium voltage side TA secondary circuit shunting circuit adopts admittance measurement data plot under 1.5kHz signal;
Fig. 4: certain transforming plant main transformer medium voltage side TA secondary circuit shunting circuit adopts admittance measurement data plot under 1.6kHz signal;
Fig. 5: certain transforming plant main transformer medium voltage side TA secondary circuit shunting circuit adopts admittance measurement data plot under 1.4kHz signal.
Embodiment
The invention belongs to a kind of electric power Current Transformer secondary circuit and survey and diagnostic method, the method is:
1) adopt the admittance change in high frequency admittance device probe current mutual inductor off-line secondary loop of hand-hold movable, determine the correctness of secondary loop of mutual inductor;
2) realize secondary loop of mutual inductor and survey in charged situation, the operating condition of energy actual response secondary circuit;
3) by taking the actual admittance value of online probe current transformer secondary circuit and comparing of basic admittance value, can control in advance the trend of secondary loop of mutual inductor to Abnormal Development, as: turn-to-turn short circuit, secondary terminals loose contact, secondary winding in current transformer turn-to-turn insulation puncture;
4) seal in principle according to secondary loop of mutual inductor, utilize shorting stub or the short cabinet terminal row outer terminal short circuit that in flakes tested loop shielded, high frequency admittance detector is sealed in behind its loop, more open secondary current, carry out secondary circuit admittance detection.
See Fig. 1, the figure shows tank admittance sniffer test philosophy figure.In actual applications, this test process main operational steps is as follows: on (1) current return secondary terminals in the screen cabinet of tested loop, utilize the in flakes short or exclusive side A of shorting stub short-circuited terminal, B, C, N terminal, then seal in open secondary current after high frequency admittance detector; (2) operation admittance detector, carries out admittance and surveys; 3) if off-line while surveying, to be detected after, same, first on the current return secondary terminals in the screen cabinet of tested loop, utilize the in flakes short or exclusive side A of shorting stub short-circuited terminal, B, C, N terminal, then exit admittance detector, finally secondary circuit is returned to state before test.
See Fig. 2, the figure shows secondary loop of mutual inductor fault analysis schematic diagram.By the test to tank admittance, determine the different fault category in loop by admittance value, thereby carry out fault diagnosis, for loop fault investigation provides powerful measure.
As shown in Figure 3, according to the electric power Current Transformer secondary circuit detection method shown in Fig. 1, when high frequency stack frequency is 1.5kHz, certain transforming plant main transformer medium voltage side secondary loop of mutual inductor admittance situation is tested, in order to get rid of on-the-spot interference, often carry out mutually 8 groups of tests, as seen from the figure, the mean value of A phase admittance is 315.112, standard deviation is that the mean value of 0.033398032, B phase admittance is 315.007, and standard deviation is 0.052957, the mean value of C phase admittance is 307.786, and standard deviation is 0.036672.
As shown in Figure 4, according to the electric power Current Transformer secondary circuit detection method shown in Fig. 1, when high frequency stack frequency is 1.6kHz, certain transforming plant main transformer medium voltage side secondary loop of mutual inductor admittance situation is tested, in order to get rid of on-the-spot interference, often carry out mutually 8 groups of tests, as seen from the figure, the mean value of A phase admittance is 317.255, standard deviation is that the mean value of 0.410806872, B phase admittance is 325.137, and standard deviation is 2.262611576, the mean value of C phase admittance is 312.137, and standard deviation is 0.184238.
As shown in Figure 5, according to the electric power Current Transformer secondary circuit detection method shown in Fig. 1, when high frequency stack frequency is 1.4kHz, certain transforming plant main transformer medium voltage side secondary loop of mutual inductor admittance situation is tested, in order to get rid of on-the-spot interference, often carry out mutually 8 groups of tests, as seen from the figure, the mean value of A phase admittance is 329.817, standard deviation is that the mean value of 0.070220952, B phase admittance is 325.137, and standard deviation is 0.040580608, the mean value of C phase admittance is 326.958, and standard deviation is 0.056205617.
It is known according to above analysis: when high frequency stack frequency is 1.4kHz-1.5kHz, be that the standard deviation of 1.6kHz test data is less than high frequency stack frequency, data test is more accurate, and a kind of electric power Current Transformer secondary circuit that therefore the present invention proposes is surveyed better than Traditional Method performance with diagnostic method.

Claims (2)

1. electric power Current Transformer secondary circuit is surveyed and a diagnostic method, it is characterized in that, the method is:
1) adopt the admittance change in the online or off-line secondary loop of the high frequency admittance device probe current mutual inductor of hand-hold movable, determine the correctness of secondary loop of mutual inductor; High frequency admittance device frequency range is 1.4kHz-1.5kHz;
2) the actual admittance value of online probe current transformer secondary circuit and basic admittance value are compared, and then control in advance in secondary loop of mutual inductor respectively or colleague occurs: the anomaly trend that turn-to-turn short circuit, secondary terminals loose contact, secondary winding in current transformer turn-to-turn insulation puncture;
3) seal in principle according to secondary loop of mutual inductor, utilize shorting stub or the short cabinet terminal row outer terminal short circuit that in flakes tested loop shielded, high frequency admittance detector is sealed in behind its loop, more open secondary current, carry out secondary circuit admittance detection.
2. survey and diagnostic method according to a kind of electric power Current Transformer secondary circuit described in claims 1; it is characterized in that: the syndeton of the tank admittance sniffer of this method is: CT secondary side A end is connected to high frequency admittance detector input end B point; be connected to the exclusive side D point of terminal in CT terminal box through high frequency admittance detector output terminal C point; terminal box E point is connected with protection screen F point; protection screen G point is connected with CT non-polar end H point, makes CT secondary circuit form closed loop.
CN201410095141.6A 2014-03-14 2014-03-14 Detecting and diagnosing method for secondary circuit of current transformer for electric power Pending CN103869168A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN104267368A (en) * 2014-10-14 2015-01-07 国家电网公司 Fault monitoring method for secondary circuit of metering current transformer
CN104849649A (en) * 2015-05-26 2015-08-19 中国电力科学研究院 System and method for detecting state of secondary circuit of current transformer for metering
CN106099714A (en) * 2016-06-20 2016-11-09 深圳供电局有限公司 A kind of 3/2nds mode of connection current loop maintenance short-circuit operation methods
CN107015095A (en) * 2017-03-23 2017-08-04 中国电力科学研究院 A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method
CN110609198A (en) * 2019-09-11 2019-12-24 广东电网有限责任公司 Operation and maintenance monitoring method for cable line and related equipment
CN110687482A (en) * 2019-11-05 2020-01-14 国网山西省电力公司阳泉供电公司 Visual secondary circuit comprehensive detector
CN110850334A (en) * 2019-11-28 2020-02-28 国网福建省电力有限公司龙岩供电公司 Nondestructive testing method and device for CT secondary circuit state

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104267368A (en) * 2014-10-14 2015-01-07 国家电网公司 Fault monitoring method for secondary circuit of metering current transformer
CN104849649A (en) * 2015-05-26 2015-08-19 中国电力科学研究院 System and method for detecting state of secondary circuit of current transformer for metering
CN104849649B (en) * 2015-05-26 2019-03-22 中国电力科学研究院 A kind of detection method of current transformer for metering secondary circuit state
CN106099714A (en) * 2016-06-20 2016-11-09 深圳供电局有限公司 A kind of 3/2nds mode of connection current loop maintenance short-circuit operation methods
CN106099714B (en) * 2016-06-20 2018-06-22 深圳供电局有限公司 A kind of 3/2nds mode of connection current loops maintenance short-circuit operation method
CN107015095A (en) * 2017-03-23 2017-08-04 中国电力科学研究院 A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method
CN110609198A (en) * 2019-09-11 2019-12-24 广东电网有限责任公司 Operation and maintenance monitoring method for cable line and related equipment
CN110687482A (en) * 2019-11-05 2020-01-14 国网山西省电力公司阳泉供电公司 Visual secondary circuit comprehensive detector
CN110850334A (en) * 2019-11-28 2020-02-28 国网福建省电力有限公司龙岩供电公司 Nondestructive testing method and device for CT secondary circuit state
CN110850334B (en) * 2019-11-28 2022-03-29 国网福建省电力有限公司龙岩供电公司 Nondestructive testing method and device for CT secondary circuit state

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