CN201497768U - Device for measuring phase current of angle joint winding - Google Patents
Device for measuring phase current of angle joint winding Download PDFInfo
- Publication number
- CN201497768U CN201497768U CN2009202036089U CN200920203608U CN201497768U CN 201497768 U CN201497768 U CN 201497768U CN 2009202036089 U CN2009202036089 U CN 2009202036089U CN 200920203608 U CN200920203608 U CN 200920203608U CN 201497768 U CN201497768 U CN 201497768U
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- China
- Prior art keywords
- phase current
- angle joint
- current
- joint winding
- winding
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Abstract
The utility model provides a device for measuring phase current of an angle joint winding, and aims to solve the problem that the phase current of the angle joint winding cannot be directly measured due to no an external leading-out terminal. However, the measurement to the phase current is necessary in practice, which is very helpful for analyzing the failure reason when a short circuit fault happens to the test object. The device is characterized in that three output terminals of the angle joint winding are respectively and in series connected and accessed into the primary sides of three same current mutual inductors, the secondary sides of the three same current mutual inductors are in series connected in sequence to form a loop, a shunt resistor is respectively connected at one end of each secondary side coil, the resistance values of the three shunt resistors are the same, the other end of the shunt resistor is grounded, and an oscillometer is connected with the shunt resistor in parallel. The device is used for measuring the phase current of the angle joint winding.
Description
Technical field
The utility model relates to measures a kind of device that transformer triangle connects the winding phase current.
Background technology
According to STL (international short-circuit test contact meeting) guide rule, when carrying out short-circuit test, should write down the oscillogram of the test wire electric current of transformer high-voltage side and low-pressure side simultaneously.The phase current that connects winding for star is exactly its line current, can directly measure; For the phase current of triangle connection winding,, can't directly measure because of it does not have bringing-out.
But it is necessary measuring triangle connection winding phase current in practice, particularly when test product is short-circuited fault, very helpful to analyzing failure cause.
Summary of the invention
For solving the technical matters that can't directly measure corner connection winding phase current, the purpose of this utility model is to provide a kind of device of measuring corner connection winding phase current.
The purpose of this utility model is achieved in that the primary side of three identical current transformers, series connection inserts three output terminals of corner connection winding respectively, the secondary side of above-mentioned three current transformers is followed in series to form the loop, end at each second siding ring respectively connects a shunt resistance, the resistance of these three shunt resistances is identical, the other end ground connection of shunt resistance, oscillograph is in parallel with shunt resistance.
The foundation of measuring is: with A is example mutually,
Its line current i
A=√ 3I
mSin (ω t+30 °),
A phase current mutual inductor secondary current i
ASCS=i
A1/K (K is a rated transformation ratio),
The flow through current i of A phase shunt resistance
Sh1=√ 3 √ 3I
mSin (ω t+30 °-30 °)/K,
Can release i
Sh1=3i
AB/ K,
That is to say the current i that shunt resistance is measured
Sh1Phase current i in instantaneous value and the A phase winding
ABThe current instantaneous value phase place is identical, and current amplitude increases 3 times, promptly obtains phase current.
Compared with prior art, the beneficial effects of the utility model are: the phase current that can determine the corner connection winding easily.
Description of drawings
Further specify the utility model below in conjunction with accompanying drawing.
Accompanying drawing is an electrical schematic diagram of the present utility model.
Embodiment
S is that triangle connects winding among the figure, and A, B, C are three extension line terminals of S; CT is the current transformer (rated transformation ratio is K) of three same model, and AS1AS2, BS1BS2, CS1CS2 are its secondary terminal; Sh1, sh2, sh3 are same model, the shunt resistance of similar resistance.
Suppose that the phase current in the A phase winding is i
AB=I
mSin ω t, its line current is i
A, A phase current mutual inductor secondary current is i
ASCS, the electric current of the A phase of flowing through shunt is i
Sh1,
I then
A=√ 3 I
mSin (ω t+30 °)
i
ASCS＝1/K?i
A
i
sh1＝√3√3I
m?sin(ωt+30°-30°)/K
Can release i
Sh1=3i
AB/ K
That is to say the current i that shunt sh1 measures
Sh1Phase current i in instantaneous value and the A phase winding
ABThe current instantaneous value phase place is identical, and current amplitude increases 3 times.
Therefore, can adopt this method directly to measure the oscillogram (peak value and root-mean-square valve) that triangle connects the winding phase current.The above-mentioned derivation of equation is justify with the method for test.
Claims (1)
1. device of measuring corner connection winding phase current, it is characterized in that: the primary side of three identical current transformers, series connection inserts three output terminals of corner connection winding respectively, the secondary side of above-mentioned three current transformers is followed in series to form the loop, end at each second siding ring respectively connects a shunt resistance, the resistance of these three shunt resistances is identical, the other end ground connection of shunt resistance, and oscillograph is in parallel with shunt resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202036089U CN201497768U (en) | 2009-09-25 | 2009-09-25 | Device for measuring phase current of angle joint winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202036089U CN201497768U (en) | 2009-09-25 | 2009-09-25 | Device for measuring phase current of angle joint winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201497768U true CN201497768U (en) | 2010-06-02 |
Family
ID=42440972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202036089U Expired - Fee Related CN201497768U (en) | 2009-09-25 | 2009-09-25 | Device for measuring phase current of angle joint winding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201497768U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136336A (en) * | 2010-12-29 | 2011-07-27 | 中国船舶重工集团公司第七一○研究所 | Method for compensating heterogeneity of magnetic field coil by shunting |
| CN102565524A (en) * | 2012-03-15 | 2012-07-11 | 江苏省电力公司常州供电公司 | Real-time monitoring method for short-circuit current of near zone of transformer |
| CN102565524B (en) * | 2012-03-15 | 2016-11-30 | 江苏省电力公司常州供电公司 | Real-time monitoring method for short-circuit current of near zone of transformer |
-
2009
- 2009-09-25 CN CN2009202036089U patent/CN201497768U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136336A (en) * | 2010-12-29 | 2011-07-27 | 中国船舶重工集团公司第七一○研究所 | Method for compensating heterogeneity of magnetic field coil by shunting |
| CN102136336B (en) * | 2010-12-29 | 2012-07-11 | 中国船舶重工集团公司第七一0研究所 | Method for compensating heterogeneity of magnetic field coil by shunting |
| CN102565524A (en) * | 2012-03-15 | 2012-07-11 | 江苏省电力公司常州供电公司 | Real-time monitoring method for short-circuit current of near zone of transformer |
| CN102565524B (en) * | 2012-03-15 | 2016-11-30 | 江苏省电力公司常州供电公司 | Real-time monitoring method for short-circuit current of near zone of transformer |
| CN106291084A (en) * | 2012-03-15 | 2017-01-04 | 江苏省电力公司常州供电公司 | A kind of power transformer near region short circuit monitoring method |
| CN106291085A (en) * | 2012-03-15 | 2017-01-04 | 江苏省电力公司常州供电公司 | Short-circuit current of near zone of transformer monitoring method |
| CN106501588A (en) * | 2012-03-15 | 2017-03-15 | 江苏省电力公司常州供电公司 | A kind of short-circuit current of near zone of transformer monitoring method |
| CN106291084B (en) * | 2012-03-15 | 2019-03-15 | 江苏省电力公司常州供电公司 | A kind of power transformer near region short circuit monitoring method |
| CN106291085B (en) * | 2012-03-15 | 2019-04-02 | 江苏省电力公司常州供电公司 | Short-circuit current of near zone of transformer monitoring method |
| CN106501588B (en) * | 2012-03-15 | 2019-06-11 | 江苏省电力公司常州供电公司 | A kind of short-circuit current of near zone of transformer monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100602 Termination date: 20150925 |
|
| EXPY | Termination of patent right or utility model |