CN109946571A - The method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester - Google Patents
The method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester Download PDFInfo
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- CN109946571A CN109946571A CN201910090902.1A CN201910090902A CN109946571A CN 109946571 A CN109946571 A CN 109946571A CN 201910090902 A CN201910090902 A CN 201910090902A CN 109946571 A CN109946571 A CN 109946571A
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Abstract
The present invention relates to the test field of electric system, specifically a kind of method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester；It is characterized in that: including the following steps: that step 1, test prepare；Step 2, wiring check；Step 3, inducting-voltage proof；Step 4, the insulation performance for checking voltage transformer, voltage transformer insulation is intact after determining test, then subject voltage transformer wiring is restored.This method is compared with prior art; relay-protection tester used be power supply-distribution system debugging it is common and must equipment; it is light and handy nimble; replace that volume is big, the three times frequency generator more than number of packages or special variable frequency power source and heavier exciting transformer with it, it is possible to reduce manpower and equipment cost improve output waveform, improve test mass.Since maximum output voltage can be set in relay-protection tester, the safety of subject voltage transformer can ensure that during test.
Description
Technical field
It is specifically a kind of to carry out mutual induction of voltage using relay-protection tester the present invention relates to the test field of electric system
The method of device induced over voltage withstand test.
Background technique
Voltage transformer is essential equipment in transformation and distribution system, and ac voltage withstanding test is handover and preventative examination
Test one of detection project.Electromagnetic potential transformer under rated frequency after voltage is increased to 1.2 times of voltage ratings, mutual inductance
Device iron core magnetic leads to saturation, and exciting current sharply increases, it is difficult to reach required test voltage, and industrial frequency withstand voltage test can only
It tests, can not test to winding inter-turn and interlayer minor insulation, simultaneously for semi-insulating structure to the major insulation of winding
Voltage transformer can not apply high pressure power-frequency voltage from primary side to carry out pressure test.In order to which comprehensive descision electromagnetic potential is mutual
Whether the insulation of sensor is able to satisfy requirement, reach at present frequently with three times frequency generator improve experiment power supply frequency,
Increase the purpose of test voltage.But complete three times frequency generator is not to design specifically for voltage transformer inducting-voltage proof,
Its number of packages is more, equipment weight, is not easy to carry, and waveform, the capacity of output can change with load, also easily causes with test product resonance humorous
Vibration overvoltage and test product is damaged.
Summary of the invention
It is an object of the invention to overcome drawbacks described above, one kind is provided and does not increase new equipment, and only utilizes conventional power supply and distribution
System debugging aids are come the method that is readily achieved electromagnetic potential transformer alternating current impression pressure test.
In order to achieve the above object, the present invention is implemented as follows:
A method of voltage transformer induced over voltage withstand test being carried out using relay-protection tester, is included the following steps:
Step 1, test prepare；
Step 2, wiring check；
Step 3, inducting-voltage proof；
Step 4, the insulation performance for checking voltage transformer, voltage transformer insulation is intact after determining test, then will be tested voltage
Mutual inductor interstar connection restores；
Wherein, step 1 specifically includes
Step 1.1, the voltage transformer factory report of preparation subject and all previous experimental technique material, preparation relay-protection tester,
The testing equipments such as high-voltage bleeder, compensation inductance, test current table, high-voltage discharging rod；
Step 1.2 checks that voltage transformer insulation performance, confirmation can carry out induced over voltage withstand test；
Step 1.3, reasonable Arrangement testing equipment, and test area is subjected to warning isolation, it is ensured that test safety；
Step 1.4, by the tester earthing of casing, and according to voltage transformer test voltage require and relay-protection tester voltage
Output parameter, connecting test instrument voltage channel enable tester to export the voltage for meeting maximum test voltage value；
Step 1.5 connects relay-protection tester power supply, and tester output frequency is set as test frequency, and adjusting tester makes
Output voltage raises to test voltage, checks the voltage value and frequency of output；
Relay-protection tester output voltage is down to 0 by step 1.6, is exited test interface, is disconnected tester power supply；
Step 2 specifically includes
Step 2.1 checks voltage transformer and the wiring of high-voltage bleeder link circuit and ground connection, it is ensured that wiring is correct, safety
Distance is enough；
Its primary side one end is first grounded ungrounded voltage transformer by step 2.2, for earthed voltage transformer by one
The ground terminal of secondary winding is grounded, then one end of the shell of voltage transformer, iron core, pedestal and each secondary winding is grounded；
Tester voltage output is connected to the one of secondary winding of voltage transformer by ammeter A1 by step 2.3；
Step 2.4, when tester voltage output capacity is lower, voltage transformer another set secondary winding is passed through into ammeter
It is connected with compensation inductance, and ensures to be tested voltage transformer under test voltage in capacitive, when tester voltage output capacity foot
Remove this step from when enough；
Step 3 specifically includes
Tester output frequency is set as test frequency into test interface by step 3.1, connection tester power supply, and highest is defeated
Voltage is set as 1.15 times of test voltage, record tester output voltage and test current during test, with every since 0 out
The rate boosting of 2% test voltage of second, while by ammeter A1 and A2 monitoring test electric current, pass through divider PV monitoring voltage
Mutual inductor primary voltage starts timing after rising to test voltage, when test voltage frequency is equal to or less than 2 times of rated frequencies,
Test period is 60s under full voltage, when test voltage frequency is greater than 2 times of rated frequencies, under full voltage test period be 120 ×But no less than 15s (s),；
Step 3.2 reaches defined test period, and test voltage is down to 0 rapidly；
Step 3.3 exits test interface, disconnects relay-protection tester power supply, after being discharged with discharging rod voltage transformer, tears open
Except test connection.
This method compared with prior art, relay-protection tester used be power supply-distribution system debugging it is common and must set
It is standby, it is light and handy nimble, replace that volume is big, the three times frequency generator more than number of packages or special variable frequency power source and heavier excitation-transformation variable with it
Depressor, it is possible to reduce manpower and equipment cost improve output waveform, improve test mass.Since relay-protection tester can be with
Maximum output voltage is set, can ensure that the safety of subject voltage transformer during test.
Detailed description of the invention
Fig. 1 is to carry out voltage transformer induced over voltage withstand test wiring schematic diagram using relay-protection tester in the present invention.
In figure in voltage transformer TV dotted line frame, a, n are secondary main winding outlet terminal, and da, dn are secondary assistant winding
Outlet terminal, N are voltage transformer high pressure tail end, and A is voltage transformer high pressure head end；In relay-protection tester dotted line frame,
U1, U2, U3 are the output of 3 phase voltage of tester, and wherein a1, n1 are the output of U1 phase voltage, and b2, n2 are the output of U2 phase voltage, c3, n3
For the output of U3 phase voltage；In divider PV dotted line frame, c1, c2 are voltage-dividing capacitor, and V is voltage indication means；Inductance L is compensated,
Ammeter A1, ammeter A2.
Specific embodiment
The present invention is further illustrated below by way of specific embodiment.
A method of induced over voltage withstand test being carried out to electromagnetic potential transformer using relay-protection tester, it is wrapped
It includes:
Step 1, test prepare；
Step 1.1 prepares the factory report of subject voltage transformer and all previous experimental technique material that voltage rating is 10kV, confirmation
About 280V voltage, frequency 150Hz are inputted from secondary winding a, n end when mutual inductor factory inducting-voltage proof, primary induction high pressure is
28kV, while preparing the tests such as relay-protection tester, high-voltage bleeder, test current table, compensation inductance, high-voltage discharging rod and setting
It is standby；
Step 1.2 checks voltage transformer insulation performance, and confirmation can carry out induced over voltage withstand test；
Step 1.3, reasonable Arrangement testing equipment, and test area is subjected to warning isolation, it is ensured that test safety；
Step 1.4, by the tester earthing of casing, and according to voltage transformer test voltage require and relay-protection tester voltage
Output parameter, connecting test instrument voltage channel enable tester to export the voltage for meeting maximum test voltage value；
Step 1.5 connects relay-protection tester power supply, tester output frequency is set as test frequency, by 3 electricity of tester
Output channel sequential series are pressed, it is 0 degree that output phase parallactic angle, which is all provided with, and adjusting tester makes output voltage between a1, n3, makes its slow liter
To test voltage 280V, the voltage value and frequency of output are checked；
Relay-protection tester output voltage is down to 0 by step 1.6, is exited test interface, is disconnected tester power supply；
Step 2, wiring check；
Step 2.1 is pressed shown in attached drawing 1, is checked voltage transformer and the wiring of high-voltage bleeder link circuit and ground connection, it is ensured that connect
Line is correct, and safe distance is enough；
Step 2.2, by shown in attached drawing 1, the ground terminal of first winding is grounded by earthed voltage transformer, then by mutual induction of voltage
The shell of device, iron core, pedestal and each secondary winding one end ground connection；
Step 2.3, by shown in attached drawing 1, by tester voltage output a1, n3 by ammeter A1 be connected to voltage transformer secondary around
Group a, n；
Step 2.4 is pressed shown in attached drawing 1, and voltage transformer auxiliary winding da, dn is connected by ammeter A2 with compensation inductance L,
And ensure to be tested voltage transformer under test voltage in capacitive；
Step 3, inducting-voltage proof；
Tester output frequency is set as 150Hz, highest is exported by step 3.1, connection tester power supply into test interface
Voltage is set as 1.15 times of test voltage, record tester output voltage and test current during test, with per second since 0
The rate of 2% test voltage is boosted, while by ammeter A1 and A2 monitoring test electric current, mutual by divider PV monitoring voltage
Sensor primary voltage starts timing, test period 40s after rising to test voltage 28kV；
Test voltage after reaching defined test period 40s, is down to 0 rapidly by step 3.2；
Step 3.3 exits test interface, disconnects relay-protection tester power supply, after being discharged with discharging rod voltage transformer, tears open
Except test connection；
Step 4, the insulation performance for checking again for voltage transformer, voltage transformer is still intact after determining test, finally will be by
Voltage transformer wiring is tried to restore.
Claims (1)
1. a kind of method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester, it is characterized in that: under including
State step:
Step 1, test prepare；
Step 2, wiring check；
Step 3, inducting-voltage proof；
Step 4, the insulation performance for checking voltage transformer, voltage transformer insulation is intact after determining test, then will be tested voltage
Mutual inductor interstar connection restores；
Wherein, step 1 specifically includes
Step 1.1, the voltage transformer factory report of preparation subject and all previous experimental technique material, preparation relay-protection tester,
The testing equipments such as high-voltage bleeder, compensation inductance, test current table, high-voltage discharging rod；
Step 1.2 checks that voltage transformer insulation performance, confirmation can carry out induced over voltage withstand test；
Step 1.3, reasonable Arrangement testing equipment, and test area is subjected to warning isolation, it is ensured that test safety；
Step 1.4, by the tester earthing of casing, and according to voltage transformer test voltage require and relay-protection tester voltage
Output parameter, connecting test instrument voltage channel enable tester to export the voltage for meeting maximum test voltage value；
Step 1.5 connects relay-protection tester power supply, and tester output frequency is set as test frequency, and adjusting tester makes
Output voltage raises to test voltage, checks the voltage value and frequency of output；
Relay-protection tester output voltage is down to 0 by step 1.6, is exited test interface, is disconnected tester power supply；
Step 2 specifically includes
Step 2.1 checks voltage transformer and the wiring of high-voltage bleeder link circuit and ground connection, it is ensured that wiring is correct, safety
Distance is enough；
Its primary side one end is first grounded ungrounded voltage transformer by step 2.2, for earthed voltage transformer by one
The ground terminal of secondary winding is grounded, then one end of the shell of voltage transformer, iron core, pedestal and each secondary winding is grounded；
Tester voltage output is connected to the one of secondary winding of voltage transformer by ammeter A1 by step 2.3；
Step 2.4, when tester voltage output capacity is lower, voltage transformer another set secondary winding is passed through into ammeter
It is connected with compensation inductance, and ensures to be tested voltage transformer under test voltage in capacitive, when tester voltage output capacity foot
Remove this step from when enough；
Step 3 specifically includes
Tester output frequency is set as test frequency into test interface by step 3.1, connection tester power supply, and highest is defeated
Voltage is set as 1.15 times of test voltage, record tester output voltage and test current during test, with every since 0 out
The rate boosting of 2% test voltage of second, while by ammeter A1 and A2 monitoring test electric current, pass through divider PV monitoring voltage
Mutual inductor primary voltage starts timing after rising to test voltage, when test voltage frequency is equal to or less than 2 times of rated frequencies,
Test period is 60s under full voltage, when test voltage frequency is greater than 2 times of rated frequencies, under full voltage test period be 120 ×But no less than 15s (s),；
Step 3.2 reaches defined test period, and test voltage is down to 0 rapidly；
Step 3.3 exits test interface, disconnects relay-protection tester power supply, after being discharged with discharging rod voltage transformer, tears open
Except test connection.
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| CN201910090902.1A CN109946571A (en) | 2019-01-30 | 2019-01-30 | The method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester |
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| CN201910090902.1A CN109946571A (en) | 2019-01-30 | 2019-01-30 | The method for carrying out voltage transformer induced over voltage withstand test using relay-protection tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748269A (en) * | 2020-12-03 | 2021-05-04 | 国网山东省电力公司青岛供电公司 | Function expansion current-voltage conversion device and method applied to relay protection tester |
| CN113376466A (en) * | 2021-06-18 | 2021-09-10 | 四川华能宝兴河水电有限责任公司 | Method for checking influence of frequency on sampling of relay protection device |
| CN114236432A (en) * | 2021-12-17 | 2022-03-25 | 中国十七冶集团有限公司 | Method for rapidly checking wiring correctness of voltage transformer by using relay protection tester |
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| AU616250B2 (en) * | 1988-04-18 | 1991-10-24 | Ergon Energy Corporation Limited | Instrument transformer testing apparatus |
| CN102540022A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester |
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| CN104330677A (en) * | 2014-11-18 | 2015-02-04 | 山东电力设备有限公司 | Device and method for testing electronic type current transformer |
| CN105277859A (en) * | 2015-11-12 | 2016-01-27 | 北京送变电公司 | Electromagnetic voltage transformer induced withstand voltage test system and method |
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2019
- 2019-01-30 CN CN201910090902.1A patent/CN109946571A/en active Pending
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| AU616250B2 (en) * | 1988-04-18 | 1991-10-24 | Ergon Energy Corporation Limited | Instrument transformer testing apparatus |
| CN102540022A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748269A (en) * | 2020-12-03 | 2021-05-04 | 国网山东省电力公司青岛供电公司 | Function expansion current-voltage conversion device and method applied to relay protection tester |
| CN113376466A (en) * | 2021-06-18 | 2021-09-10 | 四川华能宝兴河水电有限责任公司 | Method for checking influence of frequency on sampling of relay protection device |
| CN113376466B (en) * | 2021-06-18 | 2022-08-16 | 四川华能宝兴河水电有限责任公司 | Method for checking influence of frequency on sampling of relay protection device |
| CN114236432A (en) * | 2021-12-17 | 2022-03-25 | 中国十七冶集团有限公司 | Method for rapidly checking wiring correctness of voltage transformer by using relay protection tester |
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Application publication date: 20190628 |
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