CN105353258A - Test method for testing transformer differential protection anti-transformer inrush current - Google Patents
Test method for testing transformer differential protection anti-transformer inrush current Download PDFInfo
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- CN105353258A CN105353258A CN201510882675.8A CN201510882675A CN105353258A CN 105353258 A CN105353258 A CN 105353258A CN 201510882675 A CN201510882675 A CN 201510882675A CN 105353258 A CN105353258 A CN 105353258A
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- transformer
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- differential protection
- pressure regulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a test method for testing transformer differential protection anti-no-load switching transformer inrush current. According to the test method, a self-coupled voltage regulator for testing, a separation switch and a tested transformer protection device are adopted; a single side of a protection acquisition mutual inductor of the tested transformer protection device is connected in series into the primary side of the self-coupled voltage regulator for testing; the secondary side of the self-coupled voltage regulator is no-load; the protection switching-in constant value of the tested transformer protection device is set to differential protection switching in through the man-machine interface of the tested transformer protection device; a differential protection constant value is set to the minimum constant value of the tested device through the man-machine interface of the tested transformer protection device; a switching-in anti-no-load switching transformer inrush current brake constant value is set through the man-machine interface of the tested transformer protection device; a power source switch is switched on and switched off for N times, and transformer differential protection does not act; and the anti-no-load switching transformer inrush current of the transformer differential protection can be tested in a simulated manner in a laboratory, and the tests of the transformer differential protection can be improved, and the reliability, accuracy and stability of the protection device can be improved.
Description
Technical field
The invention belongs to power system relay protection device inspection field, be specifically related to
a kind of test method of testing transformer differential protection reactance transformer excitation surge current.
Background technology
Transformer is the important electrical of electric system, is widely used in the links such as the generating of electric system, distribution and transmission of electricity, thus its safe operation be related to whole electric system can the work of continous-stable.Idle-loaded switching-on is one of modal operation of transformer, further, in the cut voltage resume process of external fault, in these processes, can produce the excitation surge current that amplitude is very large.Its harm is exactly the work making transformer differential protection misoperation affect electric system continous-stable.
What current differential protection extensively adopted in identification excitation surge current is based on secondary harmonic brake mode and interval angle (escaping excitation surge current by the difference of short-circuit current and excitation surge current waveform) judgment mode, wherein with in the majority based on secondary harmonic brake mode.
In test method, method one carries out dynamic analog test, and this is generally carry out when qualification test, seldom has ready conditions carry out the test of every table apparatus when product export is tested;
Method two is the difference of simulating secondary harmonic component in excitation surge current and normal short-circuit current when delivery test, adds a certain proportion of secondary harmonic component to simulate in measuring current; For the test doing anti-air-drop inrush current of transformer with the protective device of interval angle judgment mode when delivery test hardly.
Summary of the invention
The technical problem to be solved in the present invention is to provide
a kind of test method of testing transformer differential protection reactance transformer excitation surge currentutilize the excitation surge current of air-drop when the method analogue transformer air-drop of even pressure regulator, the method is easy to realize, for the test of transformer differential protection anti-excitation surge current provides an effective solution; facilitate the perfect of product export test method, improve the reliable letter of product.
For achieving the above object, technical scheme of the present invention is as follows:
a kind of test method of testing transformer differential protection reactance transformer excitation surge current, comprising:
Step one, the side series connection protection of tested protection equipment for transformer being gathered mutual inductor enter test with from the former limit of even pressure regulator, described test with from the former limit of even pressure regulator for gathering the excitation surge current of mutual inductor;
Step 2, put switch by two for access in test loop, drop into and the power supply of excision to whole test loop to facilitate;
Step 3, test is set to zero load with paying limit from even pressure regulator,
Describedly pay limit zero load from even pressure regulator, be pay limit zero load because only have from even pressure regulator, could excitation surge current be occurred from the former limit of even pressure regulator;
Step 4, arrange tested protection equipment for transformer parameter by the man-machine interface of tested protection equipment for transformer, described parameter comprises that differential protection drops into, braking of shoving drops into, and differential protection working value is adjusted as minimum definite value;
Step 5, deciliter two put switch and obtain differential protective device of transformer anti-air-drop inrush current of transformer result for N time; according to the setting of step 4; put tested protection equipment for transformer differential protection in the process of switch answer 100% to be failure to actuate deciliter two, otherwise judge that this tested protection equipment for transformer is defective.
In a preferred embodiment of the invention, described man-machine interface is liquid crystal display on tested protection equipment for transformer and keyboard.
In a preferred embodiment of the invention, the minimum definite value that described differential protection working value is adjusted is 0.2 times of rated current.
In a preferred embodiment of the invention, described power supply adopts 220v alternating current.
In a preferred embodiment of the invention, described used from even pressure regulator be 2000VA, 220V contact type voltage regulator.
By above technical scheme, the technique effect that the present invention reaches:
The present invention utilizes the excitation surge current of air-drop when the method analogue transformer air-drop of even pressure regulator; the method is easy to realize; for the test of transformer differential protection anti-excitation surge current provides an effective solution, facilitate the perfect of product export test method, improve the reliability of product.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to use to required in embodiment or description of the prior art below
accompanying drawingbe briefly described, apparently, in the following describes
accompanying drawingonly this
inventionsome embodiments, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also according to these
accompanying drawingobtain other
accompanying drawing.
fig. 1for circuit connection of the present invention is illustrated
figure.
fig. 2for the excitation surge current oscillography when even pressure regulator drops
figure.
fig. 3for excitation surge current record ripple when transformer drops
figure.
Embodiment
The technological means realized to make the present invention, creation characteristic, reach object and effect is easy to understand, below in conjunction with specifically
diagram, set forth the present invention further.
Reference
fig. 1,
a kind of test method of testing transformer differential protection reactance transformer excitation surge current, comprising:
Step one, the protection of tested protection equipment for transformer gathered mutual inductor (one-sided) series connection access test with from the former limit of even pressure regulator; Described the protection of tested protection equipment for transformer is gathered mutual inductor (one-sided) series connection access test with from the former limit of even pressure regulator in order that gather the excitation surge current of mutual inductor; Described tested protection equipment for transformer protection gathers mutual inductor ratio and adopts 100A/7.07V welded type mutual inductor, and this mutual inductor draws tested protective device by external terminal; Described from even pressure regulator employing 2000VA, 220V contact type voltage regulator;
Step 2, put in K switch access test loop by two, described two putting in switch access test loop its objective is convenient input and excision power supply; Described two switch of putting adopts DZ47-60,220V switch;
Step 3, pay limit zero load from even pressure regulator, described to pay limit zero load from even pressure regulator be pay limit zero load because only have from even pressure regulator, could occur excitation surge current from the former limit of even pressure regulator;
Step 4, tested protection equipment for transformer parameter is set, described tested protection equipment for transformer parameter is set, the protection of tested protection equipment for transformer is set by tested protection equipment for transformer man-machine interface (man-machine interface is liquid crystal display on tested protection equipment for transformer and keyboard) to drop into definite value be that differential protection drops into, to arrange differential protection setting valve be by the minimum definite value of electricity testing device and arrange and drop into anti-air-drop inrush current of transformer braking definite value, this differential protection working value is adjusted as minimum definite value is the ability of shoving to check differential protection to escape, because minimum definite value more can make differential protection action,
Usually, described differential protection setting valve is 0.2 times of rated current, generally chooses 1A; Described setting drops into anti-air-drop inrush current of transformer braking definite value, adjusts as secondary harmonic brake;
Therefore in process of the test, differential protection must be dropped into, braking of shoving is arranged at " input " state by man-machine interface.
Step 5, deciliter two put switch and obtain differential protective device of transformer anti-air-drop inrush current of transformer result for N time, put switch and obtain differential protective device of transformer anti-air-drop inrush current of transformer result for N time for described deciliter pair, because appearance and the combined floodgate angle of excitation surge current is about (because be the interchange of 50Hz, if waveform is just in time zero crossing during combined floodgate, shoving can be much little, shove when peak value closes a floodgate maximum), adopt the excitation surge current itself carrying out testing its generation from even pressure regulator simulation power transformer little, so according to adopted different from even pressure regulator power, deciliter number of times of power switch according to circumstances can be determined during test, according to the setting of step 4, if tested protection equipment for transformer differential protection answers 100% to be failure to actuate in the process of deciliter power switch, otherwise judge that this tested protection equipment for transformer is defective.
fig. 2by the excitation surge current oscillograph when even pressure regulator drops is recorded waveform, used is 2000VA, 220V contact type voltage regulator from even pressure regulator, and oscillograph is: RIGOLDS1104, and level is time shaft, and the time cycle is 20ms, is vertically voltage, and lattice are 500mV, by
diagramcan find out and maximumly reach 1.96V; The current transformer ratio of tested protective device is 100A:7.07V; The excitation surge current that can converse when even pressure regulator air-drop is approximately 28A;
fig. 3for excitation surge current relay protection record ripple when certain power transformer drops
figure, level is time shaft, and the time cycle is 20ms, is vertically the about 1700A of current value, is primary current value, is converted to secondary current (CT no-load voltage ratio 300/5) for being approximately 28A;
fig. 2waveform with
fig. 3relatively, difference in magnitude is few, and the waveform attenuating mistiming is few,
fig. 2ratio
fig. 3the reason of waveform difference causes from even pressure regulator power is little, does not affect simulation test, therefore adopts to carry out testing from even pressure regulator and do not affect whole test effect, more convenient test.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. test a test method for transformer differential protection reactance transformer excitation surge current, it is characterized in that, comprising:
Step one, the side series connection protection of tested protection equipment for transformer being gathered mutual inductor enter test with from the former limit of even pressure regulator, described test with from the former limit of even pressure regulator for gathering the excitation surge current of mutual inductor;
Step 2, put switch by two for access in test loop, drop into and the power supply of excision to whole test loop to facilitate;
Step 3, test is set to zero load with paying limit from even pressure regulator;
Describedly pay limit zero load from even pressure regulator, be pay limit zero load because only have from even pressure regulator, could excitation surge current be occurred from the former limit of even pressure regulator;
Step 4, arrange tested protection equipment for transformer parameter by the man-machine interface of tested protection equipment for transformer, described parameter comprises that differential protection drops into, braking of shoving drops into, and differential protection working value is adjusted as minimum definite value;
Step 5, deciliter two put switch and obtain differential protective device of transformer anti-air-drop inrush current of transformer result for N time; according to the setting of step 4; put tested protection equipment for transformer differential protection in the process of switch answer 100% to be failure to actuate deciliter two, otherwise judge that this tested protection equipment for transformer is defective.
2. a kind of test method of testing transformer differential protection reactance transformer excitation surge current according to claim 1, is characterized in that, described man-machine interface is liquid crystal display on tested protection equipment for transformer and keyboard.
3. a kind of test method of testing transformer differential protection reactance transformer excitation surge current according to claim 1, is characterized in that, the minimum definite value that described differential protection working value is adjusted is 0.2 times of rated current.
4. a kind of test method of testing transformer differential protection reactance transformer excitation surge current according to claim 1, is characterized in that, described power supply adopts 220v alternating current.
5. a kind of test method of testing transformer differential protection reactance transformer excitation surge current according to claim 1, is characterized in that, described used from even pressure regulator be 2000VA, 220V contact type voltage regulator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510882675.8A CN105353258B (en) | 2015-12-03 | 2015-12-03 | A kind of test method of test transformer differential protection reactance transformer excitation surge current |
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| CN201510882675.8A CN105353258B (en) | 2015-12-03 | 2015-12-03 | A kind of test method of test transformer differential protection reactance transformer excitation surge current |
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| CN105353258B CN105353258B (en) | 2018-08-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374429A (en) * | 2016-11-14 | 2017-02-01 | 国网上海市电力公司 | Magnetic excitation rush current protection method for transformer substation being put into zero-load operation |
| CN112630642A (en) * | 2020-12-09 | 2021-04-09 | 中国电力科学研究院有限公司 | System and method for switching on-load tap-changer of transformer |
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| CN112630642A (en) * | 2020-12-09 | 2021-04-09 | 中国电力科学研究院有限公司 | System and method for switching on-load tap-changer of transformer |
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| CN105353258B (en) | 2018-08-31 |
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