CN112379194B - Secondary circuit detection method for transformer protection device - Google Patents
Secondary circuit detection method for transformer protection device Download PDFInfo
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- CN112379194B CN112379194B CN202011176674.9A CN202011176674A CN112379194B CN 112379194 B CN112379194 B CN 112379194B CN 202011176674 A CN202011176674 A CN 202011176674A CN 112379194 B CN112379194 B CN 112379194B
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000819 phase cycle Methods 0.000 claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 10
- 230000005856 abnormality Effects 0.000 claims description 7
- 230000007547 defect Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
Abstract
The invention discloses a secondary circuit detection method of a transformer protection device, which comprises the following steps: (1) Inputting the parameter fixed value of the nameplate of the transformer and the actual running power of each side into a transformer protection device, and ensuring that the transformer is put into operation after the wiring of the secondary circuit is completed; (2) The transformer protection device automatically collects three-phase voltages and three-phase currents on each side of the transformer; (3) The transformer protection device calculates three-phase voltage and three-phase current on each side of the transformer and corresponding amplitudes of zero sequence components and negative sequence components; meanwhile, the transformer protection device also calculates active power, reactive power, transformer differential current and amplitude of each side; (4) And (3) comparing the calculation result of the step (3) with various parameters input in advance, and sequentially judging each side phase sequence, voltage amplitude, power and differential current, thereby judging whether the secondary circuit of the transformer protection device is normal or not. The invention can automatically judge whether the secondary circuit is abnormal, does not need manual detection, and does not depend on special equipment.
Description
Technical Field
The invention belongs to the relay protection technology of a power system, and particularly relates to a secondary circuit detection method of a transformer protection device.
Background
The detection of the relay protection secondary circuit is still completed through a manual whole set of tests and on-load detection, and the method is far from the development subject of automation and intellectualization of the current power system. Moreover, the problems existing in the manual detection relay protection secondary circuit are more remarkable, and the defects of the manual detection relay protection secondary circuit mainly include the following aspects: (1) The manual detection is completely dependent on the service skills and responsibility centers of relay protection professionals, so that the workload is high, the efficiency is low, and errors are easy to occur; (2) Before the relay protection secondary circuit is detected correctly, the power system bears huge operation risks caused by relay protection misoperation and refusal operation, and potential safety hazards are large; (3) The manual detection mode is limited by the precision of the clamp phase meter, has high requirements on the load current of the main equipment, and often does not have detection conditions under the light load condition. The long-term operation data show that the occurrence of an incorrect relay protection action event caused by the wiring error of the relay protection secondary circuit brings serious threat to the safe and stable operation of the power grid.
Chinese patent (application No. 201210580962. X) discloses a method for providing intelligent detection of a CT secondary circuit, which can reduce the influence of logic thinking and calculation in the process of vector analysis by people, and has the defect that special intelligent detection equipment of the CT secondary circuit is needed.
Disclosure of Invention
The invention aims to: the invention aims to provide a secondary circuit detection method of a transformer protection device, which can automatically judge whether a secondary circuit is abnormal or not and does not need external equipment.
The technical scheme is as follows: the invention discloses a secondary circuit detection method of a transformer protection device, which comprises the following steps:
(1) Inputting the parameter fixed value of the nameplate of the transformer and the actual running power of each side into a transformer protection device, and putting the transformer into operation after the secondary circuit wiring of the transformer protection device is ensured to be completely completed;
(2) The transformer protection device automatically collects three-phase voltages and three-phase currents on each side of the transformer;
(3) The transformer protection device calculates three-phase voltage, three-phase current and corresponding zero sequence component and negative sequence component amplitudes of each side of the transformer respectively; meanwhile, the transformer protection device also calculates active power, reactive power, transformer differential current and amplitude of the differential current at each side of the transformer;
(4) And (3) comparing the calculated result in the step (3) with various parameters input in advance by the transformer protection device, and sequentially judging the phase sequence, the voltage amplitude, the power and the differential current of each side of the transformer protection device, thereby judging whether the secondary circuit of the transformer protection device is normal or not.
In the step (4), the specific method for judging the voltage amplitude of the transformer protection device is that the transformer protection device compares the collected voltage at each side of the transformer with the rated voltage at each side in the input nameplate parameters, and when the deviation of the collected voltage at each side exceeds a set value, an alarm signal of abnormality of a voltage sampling loop is sent out.
In the step (4), on the premise that the phase sequence and the voltage amplitude of each side of the transformer protection device are correct, judging the power of each side.
The judgment basis of the power of the transformer protection device is as follows:
in the method, in the process of the invention,representing the identity of the same side; u (U) φ Representing the effective voltage value of the same side of the transformer; i φ Representing the effective value of the current on the same side of the transformer; p (P) setφ The active power of the same side when the set transformer actually operates is shown; q (Q) setφ The reactive power of the same side when the set transformer actually operates is represented; set (Set) g The allowable deviation value is a constant value.
In the step (4), the differential current is judged on the premise that the phase sequence, the voltage amplitude and the power of each side of the transformer protection device are all correct.
The judgment basis of the differential current is that when the effective value of the longitudinal differential current of the transformer is smaller than 0.04, the secondary circuits of the voltage and the current at each side of the transformer protection device are not abnormal.
The beneficial effects are that: compared with the prior art, the invention has the beneficial effects that: the transformer protection device can automatically judge whether the corresponding secondary circuit is abnormal or not by collecting the voltage and the current of each side of the transformer, so that the defects that relay protection secondary circuit detection completely depends on manual detection are overcome, and special secondary circuit detection equipment is not needed.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention is described in further detail below in connection with the detailed description and the attached drawings.
The transformer protection device supports longitudinal differential protection, and the secondary circuit comprises a current sampling circuit and a voltage sampling circuit on each side of the transformer (each side refers to a high-voltage side, a medium-voltage side and a low-voltage side of the transformer, which are the same below). As shown in fig. 1, the secondary circuit detection method of the transformer protection device of the invention comprises the following steps:
(1) Inputting the parameter fixed value of the nameplate of the transformer and the actual running power of each side into a transformer protection device, and putting the transformer into operation after the secondary circuit wiring of the transformer protection device is ensured to be completely completed;
(2) The transformer protection device automatically collects three-phase voltages and three-phase currents on each side of the transformer;
(3) The transformer protection device calculates three-phase voltage, three-phase current and corresponding zero sequence component and negative sequence component amplitudes of each side of the transformer respectively; meanwhile, the transformer protection device also calculates active power, reactive power and differential current of each side of the transformer and amplitude of the differential current of the transformer based on a magnetic flux balance principle;
(4) And (3) comparing the calculated result in the step (3) with various parameters input in advance by the transformer protection device, and sequentially judging the phase sequence, the voltage amplitude, the power and the differential current of each side of the transformer protection device, thereby judging whether the secondary circuit of the transformer protection device is normal or not.
The specific method for judging the phase sequence is as follows: for the high-voltage side, respectively calculating the zero sequence component amplitude and the negative sequence component amplitude of the three-phase voltage, if any one of the zero sequence component amplitude and the negative sequence component amplitude exceeds 0.04Un (Un is the rated value of the high-voltage side voltage transformer), indicating that the phase sequence of the high-voltage side voltage sampling loop is misplaced, sending an alarm for abnormality of the high-voltage side voltage sampling secondary loop by the protection device, and printing a detection report; and respectively calculating the zero sequence component amplitude and the negative sequence component amplitude of the three-phase current, if any one of the zero sequence component amplitude and the negative sequence component amplitude exceeds 0.04In (In is the rated value of the high-voltage side current transformer), indicating that the phase sequence of the high-voltage side current sampling loop is misplaced, sending an alarm for abnormality of the high-voltage side current sampling secondary loop by the protection device, and printing a detection report. The same process is also sampled for the medium and low pressure sides.
The specific method for judging the voltage amplitude is as follows: and calculating three-phase voltages of the high-voltage side, the medium-voltage side and the low-voltage side of the acquired transformer, comparing the three-phase voltages with rated voltages of all sides in the input nameplate parameters, giving an alarm of abnormality of a voltage sampling loop when judging that the deviation between the three-phase voltages exceeds a set value, and printing a detection report.
And judging the power of each side on the premise that the phase sequence and the voltage amplitude of each side of the transformer protection device are correct. The specific criteria for power judgment are as follows: and respectively calculating the active power and the reactive power of each of three phases of the high-voltage side, the medium-voltage side and the low-voltage side of the transformer: the following formula is shown:
in the method, in the process of the invention,representing the same side (e.g., high voltage side) as the same, A, B, C; u (U) φ Representing the effective voltage value of the same side of the transformer; i φ Representing the effective value of the current on the same side of the transformer; p (P) setφ The active power of the same side when the set transformer actually operates is shown; q (Q) setφ The reactive power of the same side when the set transformer actually operates is represented; set (Set) g The allowable deviation value is a constant value.
If the above formula is established, it indicates that the secondary winding of the current on the side of the transformer is selected correctly, and the voltage and current polarity are correct, otherwise, it indicates that the corresponding secondary loop is abnormal.
On the premise that phase sequence judgment, voltage amplitude judgment and power judgment of each side of the transformer are correct, differential current judgment is carried out, and the effective value I of the longitudinal differential current of the transformer is determined d The calculation formula of (2) is as follows:
wherein I is h1 ，I h2 ，I m1 ，I m2 ，I l1 ，I l2 The current per unit values of the high voltage side 1 branch, the high voltage side 2 branch, the medium voltage side 1 branch, the medium voltage side 2 branch, the low voltage side 1 branch and the low voltage side 2 branch of the transformer are respectively based on rated currents of all sides.
If the formula is established, the secondary circuit of the voltage and the current at each side of the transformer protection device is completely correct without abnormality, otherwise, the secondary circuit is abnormal, the protection device automatically sends out an alarm of abnormality of the current sampling circuit, and a detection report is printed.
Claims (5)
1. The secondary circuit detection method of the transformer protection device is characterized by comprising the following steps of:
(1) Inputting the parameter fixed value of the nameplate of the transformer and the actual running power of each side into a transformer protection device, and putting the transformer into operation after the secondary circuit wiring of the transformer protection device is ensured to be completely completed;
(2) The transformer protection device automatically collects three-phase voltages and three-phase currents on each side of the transformer;
(3) The transformer protection device calculates three-phase voltage, three-phase current and corresponding zero sequence component and negative sequence component amplitudes of each side of the transformer respectively; meanwhile, the transformer protection device also calculates active power, reactive power, transformer differential current and amplitude of the differential current at each side of the transformer;
(4) The transformer protection device compares the calculated result in the step (3) with various parameters input in advance, and judges the phase sequence, the voltage amplitude, the power and the differential current of each side of the transformer protection device in sequence, so as to judge whether the secondary circuit of the transformer protection device is normal or not;
in the step (4), on the premise that the phase sequence, the voltage amplitude and the power of each side of the transformer protection device are all correct, the differential current is judged, and the effective value I of the longitudinal differential current of the transformer is determined d The calculation formula of (2) is as follows:
wherein I is h1 ，I h2 ，I m1 ，I m2 ，I l1 ，I l2 The current per unit values of the high voltage side 1 branch, the high voltage side 2 branch, the medium voltage side 1 branch, the medium voltage side 2 branch, the low voltage side 1 branch and the low voltage side 2 branch of the transformer are respectively based on rated currents of all sides.
2. The method for detecting a secondary circuit of a transformer protection device according to claim 1, wherein: in the step (4), the specific method for judging the voltage amplitude of the transformer protection device is that the transformer protection device compares the collected voltage at each side of the transformer with the rated voltage at each side in the input nameplate parameters, and when the deviation of the collected voltage at each side exceeds a set value, an alarm signal of abnormality of a voltage sampling loop is sent out.
3. The method for detecting a secondary circuit of a transformer protection device according to claim 1, wherein: in the step (4), on the premise that the phase sequence and the voltage amplitude of each side of the transformer protection device are correct, judging the power of each side.
4. The method for detecting a secondary circuit of a transformer protection device according to claim 3, wherein the power of the transformer protection device is determined according to the following criteria:
in the method, in the process of the invention,representing the identity of the same side; u (U) φ Representing the effective voltage value of the same side of the transformer; i φ Representing the effective value of the current on the same side of the transformer; p (P) setφ The active power of the same side when the set transformer actually operates is shown; q (Q) setφ The reactive power of the same side when the set transformer actually operates is represented; set (Set) g The allowable deviation value is a constant value.
5. The method for detecting a secondary circuit of a transformer protection device according to claim 1, wherein: the judgment basis of the differential current is that when the effective value of the longitudinal differential current of the transformer is smaller than 0.04, the secondary circuits of the voltage and the current at each side of the transformer protection device are not abnormal.
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| CN202011176674.9A CN112379194B (en) | 2020-10-29 | 2020-10-29 | Secondary circuit detection method for transformer protection device |
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| CN202011176674.9A CN112379194B (en) | 2020-10-29 | 2020-10-29 | Secondary circuit detection method for transformer protection device |
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| CN112379194B true CN112379194B (en) | 2024-01-16 |
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| CN116191369B (en) * | 2023-04-23 | 2023-07-11 | 北京国力电气科技有限公司 | Automatic phase sequence adjustment method and system for mine protection device, electronic equipment and storage medium |
Citations (5)
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|---|---|---|---|---|
| CN101576601A (en) * | 2009-06-16 | 2009-11-11 | 重庆大学 | Hidden failure diagnostic method of digital transformer protector measuring loop |
| CN103576027A (en) * | 2013-11-04 | 2014-02-12 | 安徽鑫龙电器股份有限公司 | Debug method based on substation integrated automation and relaying protection system integration |
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| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN109888729A (en) * | 2019-03-02 | 2019-06-14 | 安徽云汉智能科技有限公司 | A kind of early warning type transformer protection method and device |
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2020
- 2020-10-29 CN CN202011176674.9A patent/CN112379194B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN101576601A (en) * | 2009-06-16 | 2009-11-11 | 重庆大学 | Hidden failure diagnostic method of digital transformer protector measuring loop |
| KR20150030538A (en) * | 2013-09-12 | 2015-03-20 | 엘에스산전 주식회사 | Digital ratio differential relay for protecting scott transformer and controlling method thereof |
| CN103576027A (en) * | 2013-11-04 | 2014-02-12 | 安徽鑫龙电器股份有限公司 | Debug method based on substation integrated automation and relaying protection system integration |
| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN109888729A (en) * | 2019-03-02 | 2019-06-14 | 安徽云汉智能科技有限公司 | A kind of early warning type transformer protection method and device |
Non-Patent Citations (1)
| Title |
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