CN104198875B - A kind of inspection method for transformer differential protection wiring - Google Patents
A kind of inspection method for transformer differential protection wiring Download PDFInfo
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- CN104198875B CN104198875B CN201410412789.1A CN201410412789A CN104198875B CN 104198875 B CN104198875 B CN 104198875B CN 201410412789 A CN201410412789 A CN 201410412789A CN 104198875 B CN104198875 B CN 104198875B
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Abstract
The invention discloses a kind of inspection method for transformer differential protection wiring, methods described includes：Bus bar side it is determined that current transformer polarity chron, transformer high-voltage side view bus bar side are main mains side, is being taken as just, and in, low-pressure side then using transformer side as main mains side, it is just to take transformer side；During high voltage side current transformer connected mode：I`a1, I`b1, I`C1 are current transformer loop phase current, and Ia1, Ib1, IC1 are current transformer loop line current；During medium voltage side current transformer connected mode：I`a2, I`b2, I`c2 are medium voltage side current transformer loop phase current；Ia2, Ib2, Ic2 are medium voltage side current transformer loop line current；During low-pressure side current transformer connected mode：I`a3, I`b3, I`c3 are low-pressure side current transformer loop phase current, and Ia3, Ib3, Ic3 are low-pressure side current transformer loop line current.
Description
Technical field
The present invention relates to field transformer, more particularly to a kind of inspection method for transformer differential protection wiring.
Background technology
Transformer differential protection wiring check method, it is always puzzlement transformer differential protection in industrial electric construction
A problem.In traditional construction operation, the polarity of the side of current transformer first and second is to determine first.Secondly, according to original
Reason figure enters row line check and correction and wiring, is then tested to determine the correctness of wiring and relay protection, it is impossible to play differential
The effect of protection, usually because the malfunction of differential protection is not normally functioning transformer, cause great casualties and economy
Loss.
The content of the invention
The invention provides a kind of inspection method for transformer differential protection wiring, the present invention solves existing transformation
Device Differential Protection Connection constructing technology problem, it is described below：
A kind of inspection method for transformer differential protection wiring, it the described method comprises the following steps：
It is determined that current transformer polarity chron, transformer high-voltage side view bus bar side are main mains side, bus bar side is being taken as just, and
In, low-pressure side then using transformer side as main mains side, take transformer side as just；
During high voltage side current transformer connected mode：I`a1, I`b1, I`C1 are current transformer loop phase current, Ia1,
Ib1, IC1 are current transformer loop line current；
During medium voltage side current transformer connected mode：I`a2, I`b2, I`c2 are medium voltage side current transformer loop mutually electricity
Stream；Ia2, Ib2, Ic2 are medium voltage side current transformer loop line current；
During low-pressure side current transformer connected mode：I`a3, I`b3, I`c3 are low-pressure side current transformer loop mutually electricity
Stream, Ia3, Ib3, Ic3 are low-pressure side current transformer loop line current.
The beneficial effect of technical scheme provided by the invention is：In practical application, difference is ensured that according to the method described above
The wiring in dynamic protective current loop is correct, and the present invention solves existing transformer differential protection wiring constructing technology problem, avoids
Great casualties and economic loss.
Brief description of the drawings
Fig. 1 is that power taking source is timing differential protection current transformer connection figure；
Fig. 2 is high-pressure side differential protection loop current vector figure；
Fig. 3 is medium voltage side differential protection loop current vector figure；
Fig. 4 is low-pressure side differential protection loop current vector figure.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
It is described in detail on ground.
First, reference power source side Differential Protection Connection method
It is determined that current transformer polarity chron, three sides take main power source side as just.As transformer high-voltage side view bus bar side is
Main power source side, take bus bar side as just, and in, low-pressure side then using transformer side as main mains side, just, then it is to take transformer side
It is further according to more than it is assumed that come secondary pendant polar corresponding to determining.So, differential protection current transformer loop just should be by
In the following manner connects (the equal wiring of Y/Y/ Δs 1 of wiring group of the three-winding transformer of discussion)：
Fig. 1 is depicted when three sides take the differential protection current transformer loop elementary diagram that main power source side is timing.
Direction in figure shown in arrow, it is the positive direction of electric current.Direction represented by current transformer primary side current, it is normal fortune
Transformer load sense of current in the case of row.In addition, the positive ends that " ☆ " person is current transformer primary side are marked with figure,
It is marked with the positive ends that " * " person is Current Transformer Secondary side.For ease of discussing, high, medium and low three side is introduced respectively：
1st, high voltage side current transformer connected mode
From fig. 1, it can be seen that the order of connection of high-pressure side differential protection current transformer loop is a+ → b- → b+ → c- → c+
→ a-, and be positive polarity outlet.For ease of memory, above Current Transformer Secondary side connected mode is said, corresponding to transformer height
For the wiring of line ball circle, equivalent to the wiring group of Y/ Δs 1.Reverse value-the IAl for such as taking the A phase currents of high-pressure side one time is base
Quasi- vector, and the current direction according to Fig. 1, you can draw high-pressure side differential protection loop current vector as shown in Figure 2
Figure.Wherein：I`a1, I`b1, I`C1 are current transformer loop phase current, and Ia1, Ib1, IC1 are current transformer loop line electricity
Stream.
2nd, medium voltage side current transformer connected mode
See that the wiring of Fig. 1 medium voltage side differential protection current transformer loops understands that its order of connection is a- → b+ → b- → c
+ → c- → a+, and be negative polarity outlet.Above Current Transformer Secondary side connected mode corresponds to connecing for transformer high-voltage coil
For line, equivalent to the wiring of Y/ Δs 1.
If equally take vectorial (same below) on the basis of the reverse value-IA1 of the A root electric currents of high-pressure side one time, and according to Fig. 1
Shown current direction, you can draw medium voltage side differential protection loop current vector figure as shown in Figure 3.Compare Fig. 3 and Fig. 2 can
Know, now medium voltage side current transformer loop secondary side line current (i.e. differential circuit electric current, as follows) and high voltage side current are mutual
Sensor loop secondary side line current, both are exactly reverse.This pair assumes that primary current is the load under normal operation
For the situation of electric current, there is the result that differential circuit electric current offsets, illustrate above differential protection current transformer loop
Wiring is right-on.
Wherein.I`a2, I`b2, I`c2 are medium voltage side current transformer loop phase current；Ia2, Ib2, Ic2 are medium voltage side electricity
Current transformer loop line current.
3rd, low-pressure side current transformer connected mode
It is also shown from Fig. 1, the connected mode of low-pressure side differential protection current transformer loop is the star of negative polarity outlet
Wiring, therefore correspond to for the wiring of transformer high-voltage coil, equivalent to Y/Y-6 wiring.Fig. 4 depicts the electric current of above wiring
Vectogram, it is seen then that its under normal operating conditions, differential protection loop low-pressure side electric current and high voltage side current are also reverse.
Wherein：I`a3, I`b3, I`c3 are low-pressure side current transformer loop phase current, and Ia3, Ib3, Ic3 are low-pressure side electricity
Current transformer loop line current.
A kind of construction method of differential protection current transformer loop wiring is described above, as long as therefore by described above
Principle carry out wiring, so that it may also ensure differential protection current loop wiring it is correct.
The embodiment of the present invention at the trial：
1st, tested using integrated technical reformation tester, detecting system current data and phase correctness, simultaneously
Measure the electric current in differential coil.
2nd, the experiment of high current simulation system further measurement current data and phase correctness, while measure differential coil
Size of current, as a result should be correct.
3rd, before power transmission, take relay output connection sheet apart, differential protection is exited protection system and measure, further measurement
The size of current data and difference current, as a result should be correct.The connection sheet of relay protection output is connected, allows differential protection input to transport
OK.So as to show that above-mentioned wiring is correct.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (1)
1. a kind of inspection method for transformer differential protection wiring, it is characterised in that the described method comprises the following steps：
It is determined that current transformer polarity chron, transformer high-voltage side view bus bar side are main mains side, bus bar side is being taken as just, and in,
Low-pressure side takes transformer side as just then using transformer side as main mains side；
During high voltage side current transformer connected mode：I`a1, I`b1, I`c1 are high voltage side current transformer circuit phase current,
Ia1, Ib1, Ic1 are high voltage side current transformer circuit line current；
During medium voltage side current transformer connected mode：I`a2, I`b2, I`c2 are medium voltage side current transformer loop phase current；
Ia2, Ib2, Ic2 are medium voltage side current transformer loop line current；
During low-pressure side current transformer connected mode：I`a3, I`b3, I`c3 are low-pressure side current transformer loop phase current,
Ia3, Ib3, Ic3 are low-pressure side current transformer loop line current；
Tested, detection protection system power data and phase correctness, surveyed simultaneously using integrated technical reformation tester
Measure the electric current in differential coil；
High current simulation protection system test further measures current data and phase correctness, while measures differential coil
Size of current, as a result should be correct；
Before power transmission, take the connection sheet of relay protection output apart, differential protection is exited protection system and measure, further measurement
The size of current data and difference current, as a result should be correct；
The connection sheet of relay protection output is connected, allows differential protection to put into operation, so as to draw transformer differential protection wiring just
Really.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410412789.1A CN104198875B (en) | 2014-08-20 | 2014-08-20 | A kind of inspection method for transformer differential protection wiring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410412789.1A CN104198875B (en) | 2014-08-20 | 2014-08-20 | A kind of inspection method for transformer differential protection wiring |
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| Publication Number | Publication Date |
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| CN104198875A CN104198875A (en) | 2014-12-10 |
| CN104198875B true CN104198875B (en) | 2017-11-17 |
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| CN201410412789.1A Active CN104198875B (en) | 2014-08-20 | 2014-08-20 | A kind of inspection method for transformer differential protection wiring |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375438B (en) * | 2015-12-16 | 2018-01-12 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device and method for Neutral Point Through Low Resistance system |
| CN109031179B (en) * | 2018-07-04 | 2020-11-24 | 云南电网有限责任公司 | Main transformer CT polarity and protection direction self-adaptive checking method |
| CN109283421B (en) * | 2018-10-16 | 2024-02-09 | 中铁电气化（武汉）设计研究院有限公司 | Low-voltage power-on detection test method and device for railway traction substation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907670A (en) * | 2010-06-25 | 2010-12-08 | 江苏省电力公司泗洪县供电公司 | Method for verifying correctness of transformer differential protection secondary connection loop |
| CN102129006A (en) * | 2011-03-01 | 2011-07-20 | 宁波市鄞州供电局 | Method for detecting errors of differential protection secondary connection of microcomputer type transformer |
| JP2013013170A (en) * | 2011-06-28 | 2013-01-17 | Hitachi Ltd | Differential protective relay device and saturation determination method for current transformer |
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