CN205506943U - Three winding direct current resistance test circuit on simultaneous measurement transformer star type - Google Patents
Three winding direct current resistance test circuit on simultaneous measurement transformer star type Download PDFInfo
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- CN205506943U CN205506943U CN201620299486.8U CN201620299486U CN205506943U CN 205506943 U CN205506943 U CN 205506943U CN 201620299486 U CN201620299486 U CN 201620299486U CN 205506943 U CN205506943 U CN 205506943U
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Abstract
The utility model discloses a three winding direct current resistance test circuit on simultaneous measurement transformer star type, at transformer A, B, the C three -phase star type winding current sampling resistance RN that establishes ties respectively, current sampling resistance RN surveys winding resistance RX with the quilt and establishes ties, voltmeter VAN is connected respectively at every looks current sampling resistance RN both ends, voltmeter VBN and voltmeter VCN, voltmeter VAX is connected respectively at every winding resistance RX both ends of being surveyed mutually, voltmeter VBX and voltmeter VCX, concatenate every bleeder circuit that establishes ties mutually on the constant current source. The utility model discloses three -phase while testing, the produced synthetic magnetic flow of each phase electric current are zero, and the electric current changes transient process and shortens dramatically, and efficiency of software testing improves greatly, and labour saving and time saving guarantees that every looks winding temperature is unanimous, has improved measuring accuracy and reliability greatly, has reduced the use of contact, has reduced mechanical wear, have reduced the oxide film of voltage regulating switch contact to the influence of three -phase balance degree, and life is longer.
Description
Technical field
This utility model belongs to Transformer Winding D.C. resistance test device technique field, is specifically related to a kind of test circuit of measuring transformer star-like three winding D.C. resistance simultaneously.
Background technology
When existing high voltage side of transformer star winding carries out D.C. resistance test, there are the following problems for the test of star-connection (YN) winding:
1. main transformer high-pressure side winding is on-load voltage regulation mode, all gears need to will be tested by code regulation, our test mode is by on-load voltage regulation institutional adjustment high-pressure side winding gear at present, after first carrying out the D.C. resistance test of A phase (1～17 grade) winding, then commutation carries out the D.C. resistance test of B phase (17～1 grades) winding, then commutation carries out the D.C. resistance test of C phase (1～17 grade) winding；Time-consuming long.
2. completing main transformer high-pressure side A, B, C phase winding direct resistance metering, need to frequently adjust three single cycles of load ratio bridging switch, load ratio bridging switch mechanical wear is big.Increase the impact on three-phase equilibrium degree of the oxide-film of tap changer contact.
3., in commutation operating process, need to cut off test loop power supply, winding is discharged, then commutation patching operations, then test, the process that winding re-establishes magnetic flux is longer, the longest.
4. during test, electric current passes through generate heat during winding, and owing to winding is that single-phase galvanization is tested, each phase winding temperature is inconsistent, the factor of the size temperature influence of winding resistance, causes test data to there is certain deviation.The problems such as the unbalance factor of three-phase dc resistance exceeds standard.
The triple channel principle test mode of the most current domestic employing, owing to during test, neutral point lead portion does not has electric current to pass through, it is impossible to checking neutral point lead-in wire is the most normal, in addition it is also necessary to by uniphase mode one data of every the most at least checking.
Summary of the invention
The technical problems to be solved in the utility model is: for the technical problem of above-mentioned existence, a kind of test circuit of measuring transformer star-like three winding D.C. resistance simultaneously is provided, measure three-phase simultaneously, testing efficiency is high, time saving and energy saving, test data are more reliable and accurate, reduce the abrasion of contact, and service life is longer.
The technical scheme that this utility model is taked is: a kind of test circuit of measuring transformer star-like three winding D.C. resistance simultaneously, including current sampling resistor RN, at transformator A, B, the A of C three-phase star winding, B, C end series current sample resistance RN respectively, current sampling resistor RN forms, with every mutually tested winding resistance RX of tested winding, bleeder circuit of connecting, at transformator A, the current sampling resistor RN two ends of B and C three-phase concatenation connect voltmeter VAN respectively, voltmeter VBN and voltmeter VCN, at transformator A, B and C three-phase tested winding resistance RX two ends are connected respectively to voltmeter VAX, voltmeter VBX and voltmeter VCX, series connection bleeder circuit is concatenated on constant-current source.
nullThe beneficial effects of the utility model: compared with prior art，This utility model by concatenating a resistance RN respectively by the three-phase of transformator star winding，RN is known resistance，RN forms dividing potential drop with the tested winding resistance RX of every phase，The voltage at RN and RX two ends is recorded respectively by voltmeter，RX can be tried to achieve，Because using three-phase to measure simultaneously，Transformer neutral point lead portion is included in test loop，Also demonstrate neutral point lead-in wire the most normal simultaneously，Solve under current domestic employing triple channel principle test mode，Cannot verify that neutral point lead-in wire is the most normal，Also need to by the every drawback the most at least verifying data of uniphase mode，Owing to being that three-phase is tested simultaneously，And resultant flux produced by each phase current is zero，Curent change transient process shortens dramatically，Completing transformator whole gear testing time is the 1/3 of the single-phase testing time，Testing efficiency is greatly improved，Time saving and energy saving，Measure simultaneously and ensure that every phase winding temperature is consistent，Substantially increase measuring accuracy and reliability，Decrease the use of contact，Decrease mechanical wear，Reduce the impact on three-phase equilibrium degree of the oxide-film of tap changer contact，Service life is longer，This utility model also has the feature of simple in construction and convenient test.
Accompanying drawing explanation
Fig. 1 is circuit connection structure schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings and utility model is described further by specific embodiment.
nullAs shown in Figure 1，A kind of test circuit of measuring transformer star-like three winding D.C. resistance simultaneously，Including current sampling resistor RN，At transformator A、B、The A of C three-phase star winding、B、C end series current sample resistance RN respectively，Current sampling resistor RN forms, with every mutually tested winding resistance RX of tested winding, bleeder circuit of connecting，At transformator A、The current sampling resistor RN two ends of B and C three-phase concatenation connect voltmeter VAN respectively、Voltmeter VBN and voltmeter VCN，At transformator A、B and C three-phase tested winding resistance RX two ends are connected respectively to voltmeter VAX、Voltmeter VBX and voltmeter VCX，Series connection bleeder circuit is concatenated on constant-current source，By current sampling resistor RN and voltmeter VAN、Voltmeter VBN and voltmeter VCN and voltmeter VAX、Voltmeter VBX and voltmeter VCX constitutes tester in being integrated into an electric appliance box，Thus the star winding of transformator is connected with tester corresponding line，The measurement of winding D.C. resistance can be realized.
After the test electric current of constant-current source is simultaneously entered the three-phase windings of parallel connection, a sampled voltage VN is produced on the test electric current sampling resistor RN on transformator A, B, C phase winding respectively, tested winding resistance RX produces a voltage VX, resistance value according to known sample resistance RN, by following series resistance voltage division formulas, counting circuit count out the DC resistance RX of each phase winding:
nullThis utility model by concatenating a resistance RN respectively by the three-phase of transformator star winding，RN is known resistance，RN forms dividing potential drop with the tested winding resistance RX of every phase，The voltage at RN and RX two ends is recorded respectively by voltmeter，RX can be tried to achieve，Because using three-phase to measure simultaneously，Transformer neutral point lead portion is included in test loop，Also demonstrate neutral point lead-in wire the most normal simultaneously，Solve under current domestic employing triple channel principle test mode，Cannot verify that neutral point lead-in wire is the most normal，Also need to by the every drawback the most at least verifying data of uniphase mode，Owing to being that three-phase is tested simultaneously，And resultant flux produced by each phase current is zero，Curent change transient process shortens dramatically，Completing transformator whole gear testing time is the 1/3 of the single-phase testing time，Testing efficiency is greatly improved，Time saving and energy saving，Measure simultaneously and ensure that every phase winding temperature is consistent，Substantially increase measuring accuracy and reliability，Decrease the use of contact，Decrease mechanical wear，Reduce the impact on three-phase equilibrium degree of the oxide-film of tap changer contact，Service life is longer，This utility model also has the feature of simple in construction and convenient test.
The above; it is only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; any those familiar with the art is in the technical scope that this utility model discloses; change can be readily occurred in or replace; all should contain within protection domain of the present utility model, therefore, protection domain of the present utility model should be as the criterion with described scope of the claims.
Claims (1)
1. the circuit of measuring transformer star-like three winding D.C. resistance test simultaneously, it is characterized in that: include current sampling resistor RN, at transformator A, B, the A of C three-phase star winding, B, C end series current sample resistance RN respectively, current sampling resistor RN forms, with every mutually tested winding resistance RX of tested winding, bleeder circuit of connecting, at transformator A, the current sampling resistor RN two ends of B and C three-phase concatenation connect voltmeter VAN respectively, voltmeter VBN and voltmeter VCN, at transformator A, B and C three-phase tested winding resistance RX two ends connect voltmeter VAX respectively, voltmeter VBX and voltmeter VCX, series connection bleeder circuit is concatenated on constant-current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620299486.8U CN205506943U (en) | 2016-04-12 | 2016-04-12 | Three winding direct current resistance test circuit on simultaneous measurement transformer star type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620299486.8U CN205506943U (en) | 2016-04-12 | 2016-04-12 | Three winding direct current resistance test circuit on simultaneous measurement transformer star type |
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| CN205506943U true CN205506943U (en) | 2016-08-24 |
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| CN201620299486.8U Active CN205506943U (en) | 2016-04-12 | 2016-04-12 | Three winding direct current resistance test circuit on simultaneous measurement transformer star type |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456160A (en) * | 2019-08-20 | 2019-11-15 | 保定市森茂科技有限公司 | Super-pressure three-phase transformer D.C. resistance test method and test device |
| CN113009231A (en) * | 2021-03-22 | 2021-06-22 | 保定天威保变电气股份有限公司 | Method for simultaneously measuring multi-winding thermal resistors during transformer temperature rise test |
| CN113092868A (en) * | 2021-02-26 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Resistance measuring method, device, system, equipment and storage medium |
| CN113391131A (en) * | 2021-08-03 | 2021-09-14 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
-
2016
- 2016-04-12 CN CN201620299486.8U patent/CN205506943U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456160A (en) * | 2019-08-20 | 2019-11-15 | 保定市森茂科技有限公司 | Super-pressure three-phase transformer D.C. resistance test method and test device |
| CN113092868A (en) * | 2021-02-26 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Resistance measuring method, device, system, equipment and storage medium |
| CN113009231A (en) * | 2021-03-22 | 2021-06-22 | 保定天威保变电气股份有限公司 | Method for simultaneously measuring multi-winding thermal resistors during transformer temperature rise test |
| CN113391131A (en) * | 2021-08-03 | 2021-09-14 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
| CN113391131B (en) * | 2021-08-03 | 2022-07-15 | 山东双益电气有限责任公司 | Resistance testing device and method for dry-type transformer tapping winding |
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