CN113176522A - Transformer short-circuit fault detection method - Google Patents
Transformer short-circuit fault detection method Download PDFInfo
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- CN113176522A CN113176522A CN202110410081.2A CN202110410081A CN113176522A CN 113176522 A CN113176522 A CN 113176522A CN 202110410081 A CN202110410081 A CN 202110410081A CN 113176522 A CN113176522 A CN 113176522A
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/62—Testing of transformers
Abstract
The invention provides a transformer short-circuit fault detection method, which comprises the following steps: (1): collecting working parameters of a transformer; (2): selecting a suitable reference value according to the workload; (3): judging whether the winding temperature is greater than a reference value, if so, alarming when the winding temperature is high, and entering (4); if not, entering (4); (4): judging whether the current of the primary winding is larger than a reference value, if so, alarming when the current of the primary winding is high, and entering (5); if not, entering (5); (5): judging whether the vibration value is larger than a reference value, if so, alarming for abnormal vibration, and entering (6); if not, entering (6); (6): calculating the circulating current of the transformer; (7): judging whether the circulating current is larger than a reference value or not, and if so, carrying out short-circuit fault; if not, entering (8); (8): and judging whether to continue detection. The invention provides a transformer short-circuit fault detection method which is high in applicability and reliability.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a transformer short-circuit fault detection method.
Background
The transformer is one of important devices in a power system, and the Y/delta connection transformer is widely applied to power grids of various voltage classes due to the advantage of waveform improvement. The transformer circulating current is caused by unbalance in the transient process in nature and is used for offsetting the unbalance from the primary winding and avoiding the unbalance from being transmitted to a system on the other side. The existing transformer circulating current calculation method is only suitable for the condition that a neutral point on the star side of a transformer is grounded, the applicability is poor, and the detection accuracy needs to be improved.
The transformer short-circuit fault detection method provided by the invention has strong applicability, does not require symmetrical system voltage balance, and can accurately judge whether the transformer has a short-circuit fault.
Disclosure of Invention
The transformer short-circuit fault detection method provided by the invention has strong applicability, does not require symmetrical system voltage balance, and can accurately judge whether the transformer has a short-circuit fault.
The invention specifically relates to a transformer short-circuit fault detection method, which comprises the following steps:
step (1): collecting working parameters of the transformer, wherein the transformer adopts a Y/delta connection mode;
step (2): selecting a proper reference value according to the working load of the transformer;
and (3): judging whether the temperature of the transformer winding is greater than a winding temperature reference value, if so, sending a winding temperature high alarm, and entering the step (4); if not, entering the step (4);
and (4): judging whether the current of the primary winding of the transformer is larger than the current reference value of the primary winding, if so, sending a high current alarm of the primary winding, and entering the step (5); if not, entering the step (5);
and (5): judging whether the vibration value of the transformer is larger than a vibration reference value, if so, giving out a vibration abnormity alarm, and entering the step (6); if not, entering the step (6);
and (6): and extracting the phase current with the minimum absolute value of the primary winding current in a short time after the no-load switch-on of the transformer as an unsaturated phase current, and recording the phase current as iX。
And (7): calculating the leakage inductance of the primary winding of the transformer;
and (8): calculating the leakage inductance of the secondary winding of the transformer;
and (9): calculating the transformer circulating current;
step (10): judging whether the transformer circulating current is larger than a circulating current reference value or not, if so, the transformer has a short-circuit fault; if not, entering the step (11);
step (11): judging whether to continue detection, if so, returning to the step (1); if not, the process is ended.
The leakage inductance of the primary winding of the transformer is
For said transformer zero mode voltage, uAT、uBT、uCTThe voltage of the primary winding port of the transformer is obtained; u. ofNIs the neutral point voltage, L, of the star side of the transformerkShort-circuiting the inductive reactance for the transformer.
The leakage inductance of the secondary winding of the transformer is LσD＝Lk-Lσ。
The transformer has a circulating current of
Compared with the prior art, the beneficial effects are: the transformer short-circuit fault detection method comprises the steps of selecting a proper reference value according to the working load of a transformer, judging whether the winding temperature, the primary winding current and the vibration value are abnormal or not, calculating the transformer circulating current and judging whether the transformer circulating current is abnormal or not.
Drawings
Fig. 1 is a flowchart illustrating a method for detecting a short-circuit fault of a transformer according to the present invention.
Fig. 2 is a flow chart of the calculation of the transformer circulating current of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the transformer short-circuit fault detection method according to the present invention with reference to the accompanying drawings.
The transformer short-circuit fault detection method is suitable for detecting the short-circuit fault of the transformer with Y/delta connection.
As shown in fig. 1, the method for detecting a short-circuit fault of a transformer of the present invention includes the following steps:
step (1): collecting working parameters of the transformer;
step (2): selecting a proper reference value according to the working load of the transformer;
and (3): judging whether the temperature of the transformer winding is greater than a winding temperature reference value, if so, sending a winding temperature high alarm, and entering the step (4); if not, entering the step (4);
and (4): judging whether the current of the primary winding of the transformer is larger than the current reference value of the primary winding, if so, sending a high current alarm of the primary winding, and entering the step (5); if not, entering the step (5);
and (5): judging whether the vibration value of the transformer is larger than a vibration reference value, if so, giving out a vibration abnormity alarm, and entering the step (6); if not, entering the step (6);
and (6): calculating the transformer circulating current;
and (7): judging whether the transformer circulating current is larger than a circulating current reference value or not, if so, the transformer has a short-circuit fault; if not, entering the step (8);
and (8): judging whether to continue detection, if so, returning to the step (1); if not, the process is ended.
As shown in fig. 2, the transformer circulating current calculating process includes:
(1) and extracting the phase current with the minimum absolute value of the primary winding current in a short time after the no-load switch-on of the transformer as an unsaturated phase current, and recording the phase current as iX；
(2) Calculating the leakage inductance of the primary winding of the transformer
For said transformer zero mode voltage, uAT、uBT、uCTThe voltage of the primary winding port of the transformer is obtained; u. ofNIs the neutral point voltage, L, of the star side of the transformerkShort-circuiting an inductive reactance for the transformer;
(3) calculating the leakage inductance L of the secondary winding of the transformerσD＝Lk-Lσ；
(4) Calculating the transformer circulating current as
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The transformer short-circuit fault detection method is characterized by comprising the following steps of:
step (1): collecting working parameters of the transformer, wherein the transformer adopts a Y/delta connection mode;
step (2): selecting a proper reference value according to the working load of the transformer;
and (3): judging whether the temperature of the transformer winding is greater than a winding temperature reference value, if so, sending a winding temperature high alarm, and entering the step (4); if not, entering the step (4);
and (4): judging whether the current of the primary winding of the transformer is larger than the current reference value of the primary winding, if so, sending a high current alarm of the primary winding, and entering the step (5); if not, entering the step (5);
and (5): judging whether the vibration value of the transformer is larger than a vibration reference value, if so, giving out a vibration abnormity alarm, and entering the step (6); if not, entering the step (6);
and (6): and extracting the phase current with the minimum absolute value of the primary winding current in a short time after the no-load switch-on of the transformer as an unsaturated phase current, and recording the phase current as iX。
And (7): calculating the leakage inductance of the primary winding of the transformer;
and (8): calculating the leakage inductance of the secondary winding of the transformer;
and (9): calculating the transformer circulating current;
step (10): judging whether the transformer circulating current is larger than a circulating current reference value or not, if so, the transformer has a short-circuit fault; if not, entering the step (11);
step (11): judging whether to continue detection, if so, returning to the step (1); if not, the process is ended.
2. The method of claim 1, wherein the leakage inductance of the primary winding of the transformer is
For said transformer zero mode voltage, uAT、uBT、uCTThe voltage of the primary winding port of the transformer is obtained; u. ofNIs the neutral point voltage, L, of the star side of the transformerkShort-circuiting the inductive reactance for the transformer.
3. The method as claimed in claim 2, wherein the leakage inductance of the secondary winding of the transformer is LσD＝Lk-Lσ。
4. The method as claimed in claim 3, wherein the transformer circulating current is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110410081.2A CN113176522A (en) | 2021-04-16 | 2021-04-16 | Transformer short-circuit fault detection method |
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| CN202110410081.2A CN113176522A (en) | 2021-04-16 | 2021-04-16 | Transformer short-circuit fault detection method |
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|---|---|---|---|---|
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2021
- 2021-04-16 CN CN202110410081.2A patent/CN113176522A/en active Pending
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| CN111830439A (en) * | 2019-04-19 | 2020-10-27 | 宁波奥克斯高科技有限公司 | Transformer fault detection method and transformer |
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Application publication date: 20210727 |