CN104535886A - Transformer iron core multipoint grounding diagnosis and processing method - Google Patents
Transformer iron core multipoint grounding diagnosis and processing method Download PDFInfo
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- CN104535886A CN104535886A CN201510005082.3A CN201510005082A CN104535886A CN 104535886 A CN104535886 A CN 104535886A CN 201510005082 A CN201510005082 A CN 201510005082A CN 104535886 A CN104535886 A CN 104535886A
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Abstract
The invention relates to a transformer iron core multipoint grounding diagnosis and processing method. The transformer iron core multipoint grounding diagnosis and processing method is technically characterized by comprising the steps of measuring grounding current of a transformer iron core, checking whether a measuring method is correct or not and performing re-measurement if the grounding current exceeds standard, making a definite diagnosis on failure cause through oil chromatography testing and grounding current change, taking a series resistance or large current impact treatment measure if re-measurement is abnormal, and timely arranging major repair according to a transformer operation state under the necessary situation. The transformer iron core multipoint grounding diagnosis and processing method is reasonable in design, and the problems of accurate judgment and quick processing after multiple-point grounding of a transformer occurs are solved. The analysis time of technicians is remarkably reduced, the accuracy of an analysis conclusion and timeliness of problem handling are improved, safe and stable operation of the transformer and a power grid is ensured, and operation reliability of the power grid is ensured.
Description
Technical field
The invention belongs to transformer technology field, especially a kind of multipoint earthing of iron core of transformer diagnosis and management method.
Background technology
The transformer core of normal operation should one point earth, but, if fall into metallic foreign body in fuel tank, can make to be communicated with between core lamination stack with casing; In addition, if core lamination stack is because touching the reasons such as folder after the tilting of certain reason, in Transformer iron core grounding line, the situation of circulation is had to happen occasionally.According to statistics, iron core grounding fault comes the 3rd in transformer fault, accounts for more than 30% of transformer total failare.For these reasons, the State Grid Corporation of China 18 of latest edition is counter arrange in the ANOMALOUS VARIATIONS situation that Transformer should note circulation is proposed.Therefore, how carrying out treatment and analysis when transformer generation multipoint earthing of iron core, is the problem needing solution at present badly.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of multipoint earthing of iron core of transformer diagnosis and management method is provided, solve timely detection and the process problem of multipoint earthing of iron core of transformer.
The present invention solves existing technical matters and takes following technical scheme to realize:
A kind of multipoint earthing of iron core of transformer diagnosis and management method, comprises the following steps:
Step 1, measuring transformer iron core grounding current, if ground current exceeds standard, then whether check measurement method is correct, and carries out repetition measurement;
Step 2, to be tested by oil chromatography and ground current change, make a definite diagnosis failure cause;
If step 3 repetition measurement is abnormal, take the treatment measures of resistance in series or heavy current impact;
Step 4, in the case of necessary, arrange overhaul in time in conjunction with running state of transformer.
And the method whether described step 1 check measurement method is correct is: when measuring transformer iron core grounding current, clamp on amperemeter should be close to the impact that iron core grounding downlead measures leakage flux; Then clamp on amperemeter is clamped into iron core grounding downlead, measure iron core grounding current; Finally, the actual value of iron core grounding current should get rid of the influence value of leakage flux; In addition, iron core grounding downlead structure should be checked, and measure on first earth point of iron core grounding downlead.
And the treatment measures of described step 3 are: if insulation resistance changes greatly in measuring process, or inside transformer has intermittent discharging sound, then transformer core and folder exist unstable ground connection, now adopt heavy current impact, are punctured by foreign matter or hit down; When iron core grounding current is greater than 300mA, in iron core grounding downlead place resistance in series, with restricted grounding current value in critical field.
Advantage of the present invention and good effect are:
The invention provides one to detect and disposal route multipoint earthing of iron core of transformer comprehensively, reliably, quickly, solve the accurate judgement after transformer generation multipoint earthing and fast processing problem, the present invention not only considerably reduces the analysis time of technician, and improve the timely row of accuracy and the process problem analyzing conclusion, ensure that the safety of transformer and electrical network, stable operation, ensure that operation of power networks reliability.
Accompanying drawing explanation
Fig. 1 is treatment scheme schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described.
A kind of multipoint earthing of iron core of transformer diagnosis and management method, as shown in Figure 1, comprises the following steps:
Step 1, measuring transformer iron core grounding current, if ground current exceeds standard, then whether check measurement method is correct, and carries out repetition measurement.
When measuring transformer iron core grounding current, clamp on amperemeter should be close to the impact that iron core grounding downlead measures leakage flux; Then clamp on amperemeter is clamped into iron core grounding downlead, measure iron core grounding current; The actual value of iron core grounding current should get rid of the influence value of leakage flux.
During measurement, iron core grounding downlead structure should be checked, and measure on first earth point (comprising and casing tie point) of iron core grounding downlead.
Step 2, to be tested by oil chromatography and ground current change, make a definite diagnosis failure cause.
Multipoint earthing of iron core of transformer fault is usually along with oil chromatography data exception, analyze the change of the characteristic gas such as total hydrocarbon, acetylene, determine multipoint earthing of iron core fault, be generally reflected as total hydrocarbon and exceed standard and methane, ethene accounting are larger, as found, acetylene content increases, and may be dynamic earth fault.
In addition, as transformer generation multipoint earth faults, iron core grounding current changes along with transformer load level, and general load level is high, and core current level is also high.
If step 3 repetition measurement is normal, normally run; If repetition measurement is abnormal, take the treatment measures that resistance in series or heavy current impact etc. are necessary.
As repetition measurement is abnormal, transformer should arrange to have a power failure in time, measures core insulation resistance.As insulation resistance changes greatly in measuring process, or inside transformer has intermittent discharging sound, and transformer core and folder may exist unstable ground connection, now, can attempt utilizing heavy current impact, is punctured by foreign matter or hit down; If insulation resistance is zero, then there is real ground connection in inside transformer, also can attempt utilizing capacitor charge and discharge to puncture foreign matter, but success ratio is lower.
As repetition measurement is abnormal; after transformer power failure process, problem is still unresolved; also or transformer cannot arrange in the recent period have a power failure; when iron core grounding current is greater than 300mA, should consider in iron core grounding downlead place resistance in series, with restricted grounding current value in critical field; but the safeguard measure of resistance in series in rainproof etc. should be noted; and regularly arrange iron core grounding current test, prevent multipoint earthing of iron core from disappearing, cause transformer core current potential too high and damage.In addition, this treating method only has some iron core groundings effective to inside transformer, and when inside transformer has 2 iron core grounding faults, the method is inoperative.
Step 4, in conjunction with running state of transformer, arrange overhaul in time.
Run the time limit, defect situation, live detection and state evaluation result in conjunction with transformer, arrange transformer overhaul in time.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other embodiments drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (3)
1. a multipoint earthing of iron core of transformer diagnosis and management method, is characterized in that comprising the following steps:
Step 1, measuring transformer iron core grounding current, if ground current exceeds standard, then whether check measurement method is correct, and carries out repetition measurement;
Step 2, to be tested by oil chromatography and ground current change, make a definite diagnosis failure cause;
If step 3 repetition measurement is abnormal, take the treatment measures of resistance in series or heavy current impact;
Step 4, in the case of necessary, arrange overhaul in time in conjunction with running state of transformer.
2. multipoint earthing of iron core of transformer diagnosis and management method according to claim 1, it is characterized in that: the method whether described step 1 check measurement method is correct is: when measuring transformer iron core grounding current, clamp on amperemeter should be close to the impact that iron core grounding downlead measures leakage flux; Then clamp on amperemeter is clamped into iron core grounding downlead, measure iron core grounding current; Finally, the actual value of iron core grounding current should get rid of the influence value of leakage flux; In addition, iron core grounding downlead structure should be checked, and measure on first earth point of iron core grounding downlead.
3. multipoint earthing of iron core of transformer diagnosis and management method according to claim 1, it is characterized in that: the treatment measures of described step 3 are: if insulation resistance changes greatly in measuring process, or inside transformer has intermittent discharging sound, then there is unstable ground connection in transformer core and folder, now adopt heavy current impact, foreign matter is punctured or hits down; When iron core grounding current is greater than 300mA, in iron core grounding downlead place resistance in series, with restricted grounding current value in critical field.
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| CN201510005082.3A CN104535886A (en) | 2015-01-06 | 2015-01-06 | Transformer iron core multipoint grounding diagnosis and processing method |
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| CN201510005082.3A CN104535886A (en) | 2015-01-06 | 2015-01-06 | Transformer iron core multipoint grounding diagnosis and processing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199164A (en) * | 2016-06-28 | 2016-12-07 | 国网河南桐柏县供电公司 | A kind of measuring method of transformer iron core grounding current |
| CN109085451A (en) * | 2018-08-30 | 2018-12-25 | 国网北京市电力公司 | The detection method and device of iron core grounding in transformer, storage medium |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
| CN111289728A (en) * | 2020-03-26 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | Device and method for monitoring dissolved gas in insulating oil |
| CN112198461A (en) * | 2020-09-28 | 2021-01-08 | 芜湖金牛电气股份有限公司 | Dry-type transformer fault processing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199164A (en) * | 2016-06-28 | 2016-12-07 | 国网河南桐柏县供电公司 | A kind of measuring method of transformer iron core grounding current |
| CN106199164B (en) * | 2016-06-28 | 2019-07-12 | 国网河南桐柏县供电公司 | A kind of measurement method of transformer iron core grounding current |
| CN109085451A (en) * | 2018-08-30 | 2018-12-25 | 国网北京市电力公司 | The detection method and device of iron core grounding in transformer, storage medium |
| CN109085451B (en) * | 2018-08-30 | 2021-07-20 | 国网北京市电力公司 | Method and device for detecting iron core grounding in transformer and storage medium |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
| CN111289728A (en) * | 2020-03-26 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | Device and method for monitoring dissolved gas in insulating oil |
| CN112198461A (en) * | 2020-09-28 | 2021-01-08 | 芜湖金牛电气股份有限公司 | Dry-type transformer fault processing method |
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