CN108152659B - Method for judging turn-to-turn insulation short circuit of electromagnetic voltage transformer - Google Patents
Method for judging turn-to-turn insulation short circuit of electromagnetic voltage transformer Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention provides a method for judging turn-to-turn insulation short circuit of an electromagnetic voltage transformer, which is suitable for the single-phase use of the electromagnetic voltage transformer or the combination of a plurality of single-phase electromagnetic voltage transformers in a V-V shape for three-phase use. And repeating the test of the other unpressurized electromagnetic voltage transformer and any one overpressured electromagnetic voltage transformer, and judging according to different conditions. The invention can judge the problem only by simple element matching and simple operation, is simple and convenient to use and is beneficial to improving the working efficiency.
Description
Technical Field
The invention belongs to the technical field of power system safety protection methods, and particularly relates to a method for judging turn-to-turn insulation short circuit of an electromagnetic voltage transformer.
Technical Field
At present, when the electromagnetic voltage of 10kV, 35kV, 110kV and 220kV is abnormal, in order to ensure the safety of the power system and prevent the accident from being enlarged, the electromagnetic voltage transformer is generally quitted from operation and is to be checked by professional testers.
When the electromagnetic voltage transformer operates for a long time, the temperature naturally rises, and when the turn-to-turn insulation is poor, the insulation also falls, so that turn-to-turn short circuit is formed, and the monitoring voltage is abnormal. When a tester arrives at a working site for testing, the temperature of the electromagnetic voltage transformer is reduced, and turn-to-turn insulation is recovered. Because the test voltage provided by the transformation ratio bridge tester is lower, the electromagnetic voltage transformer for measuring the recovery of turn-to-turn insulation is easy to misjudge. The power transmission is normal at that time, and the monitoring voltage is abnormal after one-time.
The invention with the patent number of 201710267297.1 discloses a turn-to-turn short circuit detection device and a method for an electromagnetic voltage transformer, wherein the detection device comprises a high-frequency low-voltage steep pulse generation module, a high-speed acquisition module and an upper computer with built-in analysis software; the high-frequency low-voltage steep pulse generation module is used for generating nanosecond steep pulses and injecting steep pulse signals into a winding of the electromagnetic voltage transformer to be tested; the high-speed acquisition module is used for acquiring a characteristic waveform containing a winding short-circuit fault after passing through a winding of the electromagnetic voltage transformer to be detected, preprocessing and storing the characteristic waveform and transmitting the characteristic waveform to an upper computer; and the upper computer analyzes and processes the received characteristic waveform by adopting a repetitive pulse method, so as to obtain the short-circuit fault characteristics of the winding of the electromagnetic voltage transformer to be detected. The method is used for detecting the early turn-to-turn fault of the voltage transformer winding, can position and quantitatively compare the turn-to-turn insulation condition, avoids further expansion of the fault, and provides reliable guarantee for safe and stable operation of a power system.
The invention with the patent number of 201410039668.7 discloses an on-line discrimination method for turn-to-turn short circuit of a generator-end voltage transformer, which comprises the steps of measuring the zero-sequence voltage at the high-voltage side of a main transformer, the zero-sequence voltage at the low-voltage side of a plant and the zero-sequence voltage at the neutral point of a generator, and respectively calculating the fundamental wave effective value of each zero-sequence voltage; calculating the insulation resistance value of the stator winding to the ground by utilizing the injection type stator grounding protection principle; when the effective fundamental wave value of the zero-sequence voltage of the neutral point of the generator is larger than the stator grounding protection action fixed value, the effective fundamental wave value of the high-voltage side zero-sequence voltage of the main transformer and the effective fundamental wave value of the low-voltage side zero-sequence voltage of the plant are both lower than the fixed values, and the ground insulation resistance value of the stator winding is not reduced, the inter-turn short circuit of a generator terminal voltage transformer is judged, the alarm is given after the time delay, and the grounding protection sensitive section of the fundamental wave zero-sequence voltage stator is locked. The method can accurately judge the PT turn-to-turn short circuit fault at the generator terminal, effectively prevent the false operation of the stator grounding protection under the condition, and greatly shorten the fault troubleshooting time.
However, the above methods all require a large number of detection electronic components and intelligent processing modules, are high in cost, easy to damage, and high in use and maintenance cost, and are not favorable for quick and simple determination under severe working conditions or simple working conditions, so that a method for determining turn-to-turn insulation short circuit of a voltage transformer, which is simple, convenient and easy to implement, is required.
Disclosure of Invention
The invention provides a method for judging turn-to-turn insulation short circuit of an electromagnetic voltage transformer, which can realize the judgment of problems only by simple element matching and simple operation, is simple and convenient to use and is beneficial to improving the working efficiency.
In order to solve the technical problem, the invention provides a method for judging turn-to-turn insulation short circuit of an electromagnetic voltage transformer, which comprises the following steps of:
1) selecting a detection device for judging turn-to-turn insulation short circuit of the electromagnetic voltage transformer, wherein the detection device comprises one alternating current voltage regulator and one alternating current voltage meter;
2) taking the example that no fault or one fault occurs in all three adjacent electromagnetic voltage transformers to be detected, defining the three voltage transformers as an A group, a B group and a C group respectively, and connecting corresponding windings of the secondary sides of the A group and the B group in parallel respectively;
3) connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter;
4) when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be a small indication value all the time, the A group and the B group are proved to be fault-free electromagnetic voltage transformers;
5) connecting the AC ammeter in parallel between the high-voltage windings of the B group and the C group, slowly pressurizing the parallel ends of the secondary sides of the B group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter;
6) when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be smaller, the group A, the group B and the group C are proved to be fault-free electromagnetic voltage transformers, and the inspection is finished;
7) after the step 3) is carried out, the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally a large indication value is kept, so that the condition that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, the voltage regulator is timely reduced to zero, and the step 5) is repeated;
8) when the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator and finally keeps a large indication value, the B group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, and the inspection is finished;
9) after the step 7), the indication value of the alternating current meter is not increased to a large extent along with the slow pressurization of the alternating current voltage regulator, and when the indication value is kept small all the time, the group A electromagnetic voltage transformer is proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero, and the inspection is finished;
10) after the step 5) is carried out, the indicating value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally the larger indicating value is kept, the C group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, and the inspection is finished;
11) after the step 6), the next group of three adjacent electromagnetic voltage transformers can be subjected to code inspection according to the methods from the step 2) to the step 10) until the electromagnetic voltage transformers with faults are detected.
Further, the alternating current voltage regulator is preferably a 220V alternating current voltage regulator.
Further, the check voltage of the alternating current voltage regulator does not exceed 60V.
Further, the alternating current voltmeter is preferably a 750V alternating current voltmeter.
The electromagnetic induction type voltage transformer has the same working principle as a transformer, and also has the basic structure of an iron core, a primary side winding and a secondary side winding. Its advantages are small and constant capacity, and no load state during normal running. The impedance of the voltage transformer is very small, and once the secondary side is short-circuited, the current rapidly increases to burn the coil. Therefore, the primary side of the voltage transformer is connected with the fuse, and the secondary side is reliably grounded, so that personal and equipment accidents caused by high potential to the ground of the secondary side are avoided when the primary side and the secondary side are damaged in an insulation manner.
The method is particularly suitable for the single-phase use of the electromagnetic voltage transformers or the V-shaped use of the combination of a plurality of single-phase electromagnetic voltage transformers, and the sensitivity of the short-circuit tripping system of the current substation power system is that when one electromagnetic voltage transformer fails to generate turn-to-turn short circuit and the monitoring voltage is abnormal, the system can rapidly alarm and trip electricity, so that the probability of the failure of two or more single-phase electromagnetic voltage transformers is low, so the method is a precondition that no failure or one failure occurs in the electromagnetic voltage transformers, and the failure judgment under most conditions can be met.
The invention has the beneficial effects that the invention can be used as a common detection device, and can quickly and accurately judge whether the electromagnetic voltage transformers have turn-to-turn short circuit or not through simple detection steps, namely, secondary pressurization is carried out on any two electromagnetic voltage transformers, and then whether the electromagnetic voltage transformers have poor turn-to-turn insulation or not is judged through a method of connecting the voltage transformers in parallel. The simple and practical method is beneficial to improving the working efficiency, achieves the aim of accurately judging the fault electromagnetic voltage transformer, is particularly suitable for complex and severe working condition environments, and is particularly easy to realize and practical.
Drawings
The technical solution in the embodiment of the present invention will be described below with reference to the accompanying drawings:
FIG. 1 is a diagram of the detection wiring of the detection device of the present invention.
FIG. 2 is a schematic diagram of a first embodiment of the present invention.
Detailed Description
Example one
As shown in fig. 1 and fig. 2, the determination is made according to the general knowledge of the actual working conditions, taking as an example that there is no fault or only one fault in three adjacent electromagnetic voltage transformers to be detected, defining the three voltage transformers as a group a, a group B, and a group C, respectively, selecting a 220V ac voltage regulator and a 750V ac voltage meter, assembling the detection device for determining the insulation short circuit between turns of the electromagnetic voltage transformers according to fig. 1, and specifically determining the operation according to the following conditions:
judgment 1: respectively connecting corresponding windings of the secondary sides of the group A and the group B in parallel, connecting the alternating current meters in parallel between the high-voltage windings of the group A and the group B, slowly pressurizing the parallel ends of the secondary sides of the group A and the group B through the alternating current voltage regulator, and observing the voltage values of the alternating current meters; when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be a small indication value all the time, the A group and the B group are proved to be fault-free electromagnetic voltage transformers; connecting the AC ammeter in parallel between the high-voltage windings of the B group and the C group, slowly pressurizing the parallel ends of the secondary sides of the B group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter; when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be smaller, the group A, the group B and the group C are proved to be fault-free electromagnetic voltage transformers, and the inspection is finished;
and (3) judging: connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally, when the indication value is kept to be larger, the fact that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, and the voltage regulator is timely reduced to zero; connecting the AC ammeter in parallel between the high-voltage windings of the B group and the C group, slowly pressurizing the parallel ends of the secondary sides of the B group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter; when the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator and finally keeps a larger indication value, the group B electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, the inspection is finished, and the simple judgment graph is shown in fig. 2;
and 3, judgment: connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally, when the indication value is kept to be larger, the fact that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, and the voltage regulator is timely reduced to zero; connecting the AC ammeter in parallel between the high-voltage windings of the B group and the C group, slowly pressurizing the parallel ends of the secondary sides of the B group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator, and when the indication value is kept small all the time, the A group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero, and the inspection is finished;
and 4, judgment: respectively connecting corresponding windings of the secondary sides of the group A and the group B in parallel, connecting the alternating current meters in parallel between the high-voltage windings of the group A and the group B, slowly pressurizing the parallel ends of the secondary sides of the group A and the group B through the alternating current voltage regulator, and observing the voltage values of the alternating current meters; when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be a small indication value all the time, the A group and the B group are proved to be fault-free electromagnetic voltage transformers, and the C group is proved to be fault; at this time, in order to verify the judgment, the alternating current meters are connected in parallel between the high-voltage windings of the B group and the C group, the parallel ends of the secondary sides of the B group and the C group are slowly pressurized through the alternating current voltage regulators, the voltage values of the alternating current meters are observed, the indicating values of the alternating current meters are greatly increased along with the slow pressurization of the alternating current voltage regulators, and finally, when the larger indicating values are kept, the electromagnetic voltage transformers of the C group are proved to have poor inter-turn insulation, the voltage regulators are timely reduced to zero, and the inspection is finished;
after all judgments are finished, if the situation of the judgment 1 occurs, code inspection can be carried out on the next group of three adjacent electromagnetic voltage transformers according to the method from the step 2) to the step 10) in the specification until the electromagnetic voltage transformers with faults are detected.
Example two
Judging according to the common sense of the actual working conditions, taking the example that no fault exists or only one fault occurs in three adjacent electromagnetic voltage transformers to be detected, respectively defining the three voltage transformers as a group A, a group B and a group C, and selecting a 220V alternating current voltage regulator and a 750V alternating current voltmeter, wherein the difference from the first embodiment is that in the wiring detection method of the first embodiment, the conditions of 2, 3 and 4 are judged as follows:
and (3) judging: connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally, when the indication value is kept to be larger, the fact that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, and the voltage regulator is timely reduced to zero; connecting the AC ammeter in parallel between the high-voltage windings of the A group and the C group, slowly pressurizing the parallel ends of the secondary sides of the A group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter; when the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator and finally keeps a large indication value, the A group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, and the inspection is finished;
and 3, judgment: connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally, when the indication value is kept to be larger, the fact that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, and the voltage regulator is timely reduced to zero; connecting the AC ammeter in parallel between the high-voltage windings of the A group and the C group, slowly pressurizing the parallel ends of the secondary sides of the A group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter; the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator, and when the indication value is kept small all the time, the B group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero, and the inspection is finished;
and 4, judgment: respectively connecting corresponding windings of the secondary sides of the group A and the group B in parallel, connecting the alternating current meters in parallel between the high-voltage windings of the group A and the group B, slowly pressurizing the parallel ends of the secondary sides of the group A and the group B through the alternating current voltage regulator, and observing the voltage values of the alternating current meters; when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be a small indication value all the time, the A group and the B group are proved to be fault-free electromagnetic voltage transformers, and the C group is proved to be fault; at this time, in order to verify the judgment, the alternating current meters are connected in parallel between the high-voltage windings of the group A and the group C, the parallel ends of the secondary sides of the group A and the group C are slowly pressurized through the alternating current voltage regulator, the voltage values of the alternating current meters are observed, the indicating values of the alternating current meters are greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally, when the larger indicating values are kept, the electromagnetic voltage transformer of the group C is proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero, and the inspection is finished.
EXAMPLE III
In the embodiment, mainly, no fault or one fault in three adjacent electromagnetic voltage transformers is taken as an example, which can meet most fault condition judgment, when two or more electromagnetic voltage transformers have faults, the judgment can be carried out according to the following principle, namely according to the embodiment method, the two adjacent electromagnetic voltage transformers are firstly pressurized and measured, and when the indication of a voltmeter is large, the condition that one electromagnetic voltage transformer has poor turn-to-turn insulation is indicated, and the voltage regulator needs to be timely reduced to zero. The test was repeated with another unpressurized electromagnetic potential transformer and any one of the overpressured electromagnetic potential transformers. When the measured voltage has a large value for two times, the problem of the voltage transformer which pressurizes for two times is shown. When the measured voltage is larger only once, the electromagnetic voltage transformer which is pressurized twice is good, and the electromagnetic voltage transformer which is pressurized once and has larger measured voltage is damaged.
While the invention has been described in terms of what are presently considered to be the preferred embodiments, and not of limitation, those skilled in the art will recognize that many alternative embodiments may be implemented using the concepts of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for judging turn-to-turn insulation short circuit of an electromagnetic voltage transformer is characterized by comprising the following steps:
1) selecting a detection device for judging turn-to-turn insulation short circuit of the electromagnetic voltage transformer, wherein the detection device comprises one alternating current voltage regulator and one alternating current voltage meter;
2) taking the example that no fault or one fault occurs in all three adjacent electromagnetic voltage transformers to be detected, defining the three voltage transformers as an A group, a B group and a C group respectively, and connecting corresponding windings of the secondary sides of the A group and the B group in parallel respectively;
3) connecting the AC ammeter in parallel between the high-voltage windings of the A group and the B group, slowly pressurizing the parallel ends of the secondary sides of the A group and the B group through the AC voltage regulator, and observing the voltage value of the AC ammeter;
4) when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be a small indication value all the time, the A group and the B group are proved to be fault-free electromagnetic voltage transformers;
5) connecting the AC ammeter in parallel between the high-voltage windings of the B group and the C group, slowly pressurizing the parallel ends of the secondary sides of the B group and the C group through the AC voltage regulator, and observing the voltage value of the AC ammeter;
6) when the indication value of the alternating current meter is not greatly increased along with the slow pressurization of the alternating current voltage regulator and is kept to be smaller, the group A, the group B and the group C are proved to be fault-free electromagnetic voltage transformers, and the inspection is finished;
7) after the step 3) is carried out, the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally a large indication value is kept, so that the condition that one electromagnetic voltage transformer between the group A and the group B has poor turn-to-turn insulation is proved, the voltage regulator is timely reduced to zero, and the step 5) is repeated;
8) when the indication value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator and finally keeps a large indication value, the B group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, and the inspection is finished;
9) after the step 7), the indication value of the alternating current meter is not increased to a large extent along with the slow pressurization of the alternating current voltage regulator, and when the indication value is kept small all the time, the group A electromagnetic voltage transformer is proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero, and the inspection is finished;
10) after the step 5) is carried out, the indicating value of the alternating current meter is greatly increased along with the slow pressurization of the alternating current voltage regulator, and finally the larger indicating value is kept, the C group of electromagnetic voltage transformers are proved to have poor turn-to-turn insulation, the voltage regulator is timely reduced to zero at the moment, and the inspection is finished;
11) after the step 6), performing code inspection on the next group of three adjacent electromagnetic voltage transformers according to the method from the step 2) to the step 10) until the electromagnetic voltage transformers with faults are detected;
the alternating current voltmeter is preferably a 750V alternating current voltmeter.
2. The method for determining an inter-turn insulation short circuit of an electromagnetic voltage transformer according to claim 1, wherein: the alternating current voltage regulator is preferably a 220V alternating current voltage regulator.
3. The method for determining an inter-turn insulation short circuit of an electromagnetic voltage transformer according to claim 1, wherein: the inspection voltage of the alternating current voltage regulator does not exceed 60V.
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| CN102778615A (en) * | 2011-05-11 | 2012-11-14 | 大连互感器有限公司 | Error experiment device of zero sequence voltage mutual inductors |
| CN103257334A (en) * | 2013-05-15 | 2013-08-21 | 河南省电力公司平顶山供电公司 | 6-35KV electro-magnetic voltage transformer quick diagnosing instrument and using method |
| CN106771514A (en) * | 2016-11-25 | 2017-05-31 | 国网河南省电力公司平顶山供电公司 | A kind of device and method of quick lookup voltage transformer failure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778615A (en) * | 2011-05-11 | 2012-11-14 | 大连互感器有限公司 | Error experiment device of zero sequence voltage mutual inductors |
| CN103257334A (en) * | 2013-05-15 | 2013-08-21 | 河南省电力公司平顶山供电公司 | 6-35KV electro-magnetic voltage transformer quick diagnosing instrument and using method |
| CN106771514A (en) * | 2016-11-25 | 2017-05-31 | 国网河南省电力公司平顶山供电公司 | A kind of device and method of quick lookup voltage transformer failure |
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