CN202886475U - Direct current resistance measuring meter of three-phase inductive coil - Google Patents
Direct current resistance measuring meter of three-phase inductive coil Download PDFInfo
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- CN202886475U CN202886475U CN 201220619007 CN201220619007U CN202886475U CN 202886475 U CN202886475 U CN 202886475U CN 201220619007 CN201220619007 CN 201220619007 CN 201220619007 U CN201220619007 U CN 201220619007U CN 202886475 U CN202886475 U CN 202886475U
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Abstract
The utility model discloses a direct current resistance measuring meter of a three-phase inductive coil. The direct current resistance measuring meter comprises a measuring meter body, a direct current power supply, two constant-current sources and a wiring terminal strip, wherein the two constant-current sources are respectively a first constant-current source and a second constant-current source; output anodes of the first constant-current source and the second constant-current source are connected with the direct current power supply in series and then connected to the wiring terminal strip after passing through a 32nd switch; the output cathodes of the first constant-current source and the second constant-current source are respectively connected to a port A and a port C of the wiring terminal strip after passing through a 35th switch and a 17th switch; and the wiring terminal strip J1 is connected to a corresponding three-phase winding of a tested transformer. The direct current resistance measuring meter can achieve measurement of the direct current resistance of the three-phase inductive coil of the transformer under the condition of not switching a current channel. Therefore, the complexity of operation is greatly reduced, and the measurement efficiency is improved.
Description
Technical field
But the utility model relates to a kind of method of Quick Measurement Three-Phase Transformer DC resistance of inductive winding, belongs to field of measuring technique.
Background technology
At present, the common method of measuring transformer three-phase DC resistance of inductive winding is to adopt the instrument for measuring DC resistance with the output of single channel constant current source by measuring mutually, for the three-phase inductive coils transformer with on-load tap changer, a shunting switch needs artificial startup, discharge just can record the mutually dc resistance of inductive coils of A phase, B phase and C three times, so just greatly prolong Measuring Time, reduced work efficiency.In addition, induction reactance is larger because the high-power transformer secondary resistance is very little, and when its direct current resistance was measured, the duration of charging was long and difficult stable, is not suitable for measuring with conventional method.Therefore, how the direct current resistance of Quick Measurement Three-Phase Transformer inductive coils is the difficult problem that the relevant technologies personnel face always.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of three-phase DC resistance of inductive winding measuring instrument is provided, and measures efficient and solves the problem that the high-power transformer secondary resistance is difficult to measure to improve.
The alleged problem of the utility model realizes with following technical proposals:
A kind of three-phase DC resistance of inductive winding measuring instrument, it comprises measurement instrument, and its special feature is, and it also comprises direct supply, two constant current sources and connecting terminal block; Described two constant current sources are respectively the first constant current source and the second constant current source; The output cathode end of described the first constant current source and the second constant current source is connected with direct supply by being connected to connecting terminal block behind the 32nd switch, the output negative pole end of described the first constant current source and the second constant current source is connected to respectively A port and the C port of connecting terminal block behind the 35th switch and the 17th switch, described connecting terminal block J1 connects the three-phase corresponding windings of tested transformer.
Above-mentioned three-phase DC resistance of inductive winding measuring instrument, set up switch member, wherein, an end points of the 26th switch, the 27th switch and the 30th switch all is connected to the output negative pole end of the first constant current source, another end points is connected to respectively u port, v port, the w port of connecting terminal block, the 32nd switch is single-pole double-throw switch (SPDT), and its center-side is connected to direct supply, and two ends are connected to respectively A, the B port of connecting terminal block in addition; The 34th switch is single-pole double-throw switch (SPDT), and its center-side is connected to the 32nd switch, and two ends are connected to respectively B, the C port of connecting terminal block in addition;
In addition, between the A of connecting terminal block, W port, set up the 25th switch;
Between the A of connecting terminal block, B port, set up the 21st switch;
Between the A of connecting terminal block, C port, set up the 22nd switch;
Between the B of connecting terminal block, C port, set up the 20th switch;
At an end of the U of connecting terminal block port connection the 23rd switch, the other end of the 23rd switch is connected on the 34th switch;
Connect an end of the 24th switch at the V port of connecting terminal block J1, the other end of the 24th switch is connected on the 34th switch.
The utility model just can be realized the measurement of Three-Phase Transformer DC resistance of inductive winding without the switch current passage, greatly reduces the complexity of operation, has improved measurement efficient.The winding of transformer primary side is sealed in test loop not only can reduce the time constant of test loop, but also make iron core be easy to magnetic saturation, thereby further accelerated charging process, shortened Measuring Time.This tester is particularly suitable for the measurement of YN-d-11 type Transformer Winding direct current resistance.
The precision of phase-splitting and three-phase test and duration contrast:
Can analyze from above form: two kinds of method of testings no significant difference aspect precision, but the test duration of three-phase to much smaller than total duration of phase-splitting test, this shows that it has greatly improved testing efficiency.
To three core five-pole transformers more than 240,000 kVA, the following electric current of 20A can't realize that the short time fully charges to this transformer, so select at least the 40A power source charges, a mutually complete low voltage experiment needs more than 36 minutes.If it is complete to use 5A magnetic assist method one can measure in 10 minutes mutually.The magnetic assist method that this explanation the utility model proposes can realize less current charges, economizes on resources, raises the efficiency.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is winding charging equivalent circuit;
Fig. 2 is electrical schematic diagram of the present utility model;
Fig. 3 is the measurement electrical schematic diagram of three phases winding at primary side;
Fig. 4 is the electrical schematic diagram that secondary side winding u phase direct current resistance R4 measures;
Fig. 5 is the electrical schematic diagram that secondary side winding v phase direct current resistance R5 measures.
Each label is among the figure: B, direct supply; L, Transformer Winding inductance; R, coil-block of transformer; The first constant current source I1; The second constant current source I2; J1, connecting terminal block; R1, first side winding A phase resistance; R2, first side winding B phase resistance; R3, first side winding C phase resistance; R4, secondary side winding u phase resistance; R5, secondary side winding v phase resistance; R6, secondary side winding w phase resistance; K17～K35, the 17th switch～the 35th switch.
Embodiment
Referring to Fig. 1～Fig. 5, adopt the utility model need not change the direct current resistance that current channel can record transformer A, B, C three phase windings.When three phase windings of YN-d-11 type transformer are measured, measuring current in measuring current in the A phase winding and the C phase winding is provided by two constant current sources respectively, and the measuring current of B phase winding then is measuring current in the A phase winding and the summation of the measuring current in the C phase winding.For transformer itself, electric current flows into from transformer B phase winding, flows out from A phase winding and C phase winding, and this phase Injection Current is conflicted at the induction current that this produces mutually mutually with other, satisfies the requirement that YN-d-11 type Three-Phase Transformer is tested simultaneously.
The magnetic assist scheme
Inside of the present utility model comprises automatic magnetic assist measurement scheme: there is a very large inductance in Transformer Winding, and the winding inductance of high-power transformer can be prosperous to hundreds of greatly even be being crossed thousand henries, and the resistance of winding is very little, can be as small as the hundreds of microhm.The metering circuit of Transformer Winding direct current resistance can represent with equivalent circuit shown in Figure 1.When closing a switch K, because the electric current in the Transformer Winding inductance L can not suddenly change, the current i in loop will slowly change, and its process can represent with following formula:
U=iR-Ldi/dt
Then have: i=U* (1-e
T/T)/R
R is coil-block of transformer in the formula, and T is the time constant in loop, T=L/R.As seen formula will shorten the time that electric current reaches balance thus, and best bet is to increase coil-block of transformer R.Accordingly, we seal in test loop to the winding of transformer primary side, to increase equivalent resistance, accelerate the charging process of winding, reach the purpose of Quick Measurement.
According to above principle, we adopt circuit structure shown in Figure 2 in direct current resistance measurer, and its design is ingenious, structure is simple and direct, the paramagnetic magnetic assist mode when meeting different windings measurement.
When measuring resistance R 1, R2, the R3 of three phases winding at primary side, the state of the 32nd K switch 32 in the switch, the 34th K switch 34, the 35th K switch 35, the 17th K switch 17 as shown in Figure 4, the limit of rest switch all disconnects.
All switches of the present utility model all can adopt relay to replace.
When measuring secondary side winding u phase resistance R4, pass through Single-chip Controlling, make the 32nd K switch 32, the 21st K switch 21, the 23rd K switch 23, the 27 simultaneously adhesives (referring to Fig. 4) of the 27th K switch, electric current is from the positive pole of direct supply B, enter A, B two phase windings through the 32nd K switch 32, flow out again the 23rd K switch 23 of then flowing through from the C phase winding, electric current flows through secondary side winding u phase resistance R4, gets back to direct supply B negative pole from the v phase winding through the 27th K switch 27 and the first constant current source I1 again.Like this, just R1//R2+R3 resistance has been sealed in test loop, thereby accelerated charging process.In addition, because the direction of current of the last side of A post and Secondary Winding is identical, make iron core be easier to magnetic saturation, further accelerated charging process.
When measuring secondary side winding v phase resistance R5, the 32nd K switch 32, the 34th K switch 34, the 21st K switch 21, the 25th K switch 25, the 27th K switch 27 simultaneously closed (referring to Fig. 5), electric current through the 32nd K switch 32, the 34th K switch 34 and C phase resistance R3, passes through R1//R2 from the positive pole of direct supply B again, bring out from A, through the 25th K switch 25 to w, be that v charges mutually to R5 again, bring out from v, arrive power-polarity end through the 27th K switch 27, the first constant current source I1 again, finish charging.
To the charging process of secondary side winding w phase, similar to other two-phase, it is different to have part relay folding condition only, repeats no more.
Claims (2)
1. three-phase DC resistance of inductive winding measuring instrument, it comprises measurement instrument, it is characterized in that, it also comprises direct supply B, two constant current sources and connecting terminal block (J1); Described two constant current sources are respectively the first constant current source (I1) and the second constant current source (I2); The output cathode end of described the first constant current source (I1) and the second constant current source (I2) is connected with direct supply B by being connected to connecting terminal block (J1) behind the 32nd switch (K32), the output negative pole end of described the first constant current source (I1) and the second constant current source (I2) is connected to respectively A port and the C port of connecting terminal block (J1) behind the 35th switch (K35) and the 17th switch, described connecting terminal block (J1) connects the three-phase corresponding windings of tested transformer.
2. three-phase DC resistance of inductive winding measuring instrument according to claim 1, it is characterized in that, set up switch member, wherein, an end points of the 26th switch (K26), the 27th switch (K27) and the 30th switch (K30) all is connected to the output negative pole end of the first constant current source (I1), another end points is connected to respectively u port, v port, the w port of connecting terminal block (J1), the 32nd switch (K32) is single-pole double-throw switch (SPDT), its center-side is connected to direct supply B, and the other end is connected to A, the B port of connecting terminal block (J1); The 34th switch (K34) is single-pole double-throw switch (SPDT), and its center-side is connected to the 32nd switch, and two ends are connected to respectively B, the C port of connecting terminal block (J1) in addition;
In addition, between the A of connecting terminal block (J1), W port, set up the 25th switch (K25);
Between the A of connecting terminal block (J1), B port, set up the 21st switch (K21);
Between the A of connecting terminal block (J1), C port, set up the 22nd switch (K22);
Between the B of connecting terminal block (J1), C port, set up the 20th switch (K20);
Connect an end of the 23rd switch (K23) at the U port of connecting terminal block (J1), the other end of the 23rd switch is connected on the 34th switch (K34);
Connect an end of the 24th switch (K24) at the V port of connecting terminal block (J1), the other end of the 24th switch is connected on the 34th switch (K34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220619007 CN202886475U (en) | 2012-11-21 | 2012-11-21 | Direct current resistance measuring meter of three-phase inductive coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220619007 CN202886475U (en) | 2012-11-21 | 2012-11-21 | Direct current resistance measuring meter of three-phase inductive coil |
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| CN202886475U true CN202886475U (en) | 2013-04-17 |
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| CN 201220619007 Expired - Fee Related CN202886475U (en) | 2012-11-21 | 2012-11-21 | Direct current resistance measuring meter of three-phase inductive coil |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257160A (en) * | 2013-04-24 | 2013-08-21 | 华中科技大学 | Method for detecting winding material of three-phase winding device based on thermocouple principle |
| CN103293385A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Direct-current resistance quick testing device for transformers in temperature-rise tests |
| CN105067890A (en) * | 2015-07-14 | 2015-11-18 | 东营市双益电气有限责任公司 | Method for measuring transformer DC resistance by utilizing zero flux method and measuring system thereof |
| AT518763A1 (en) * | 2016-05-25 | 2017-12-15 | Omicron Electronics Gmbh | Methods and apparatus for determining resistances in polyphase transformers |
| CN111175577A (en) * | 2020-01-07 | 2020-05-19 | 云南铝业股份有限公司 | Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer |
| 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 |
| CN113777534A (en) * | 2021-08-31 | 2021-12-10 | 浙江大成中孚电力技术发展有限公司 | High-precision measurement device for unbalance rate of marine transformer winding and rapid test method |
| WO2022117549A1 (en) * | 2020-12-03 | 2022-06-09 | Omicron Electronics Gmbh | Method and measuring device for determining a resistance of a transformer winding |
-
2012
- 2012-11-21 CN CN 201220619007 patent/CN202886475U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257160B (en) * | 2013-04-24 | 2015-06-03 | 华中科技大学 | Method for detecting winding material of three-phase winding device based on thermocouple principle |
| CN103257160A (en) * | 2013-04-24 | 2013-08-21 | 华中科技大学 | Method for detecting winding material of three-phase winding device based on thermocouple principle |
| CN103293385B (en) * | 2013-05-14 | 2016-03-02 | 国家电网公司 | Transformer temperature rise test quick test device for direct-current resistance |
| CN103293385A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Direct-current resistance quick testing device for transformers in temperature-rise tests |
| CN105067890B (en) * | 2015-07-14 | 2018-10-19 | 山东双益电气有限责任公司 | Use the method and its measuring system of Zero flux method measuring transformer D.C. resistance |
| CN105067890A (en) * | 2015-07-14 | 2015-11-18 | 东营市双益电气有限责任公司 | Method for measuring transformer DC resistance by utilizing zero flux method and measuring system thereof |
| AT518763A1 (en) * | 2016-05-25 | 2017-12-15 | Omicron Electronics Gmbh | Methods and apparatus for determining resistances in polyphase transformers |
| US10884072B2 (en) | 2016-05-25 | 2021-01-05 | Omicron Electronics Gmbh | Method and apparatus for determining resistances in multiphase transformer using multiple injected currents in respective windings |
| AT518763B1 (en) * | 2016-05-25 | 2023-12-15 | Omicron Electronics Gmbh | Methods and devices for determining resistances in multi-phase transformers |
| CN111175577A (en) * | 2020-01-07 | 2020-05-19 | 云南铝业股份有限公司 | Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer |
| WO2022117549A1 (en) * | 2020-12-03 | 2022-06-09 | Omicron Electronics Gmbh | Method and measuring device for determining a resistance of a transformer winding |
| 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 |
| CN113777534A (en) * | 2021-08-31 | 2021-12-10 | 浙江大成中孚电力技术发展有限公司 | High-precision measurement device for unbalance rate of marine transformer winding and rapid test method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20141121 |
|
| EXPY | Termination of patent right or utility model |