CN203084141U - Polarity test device for transformer bushing CT (Captive Test) and neutral point CT - Google Patents

Polarity test device for transformer bushing CT (Captive Test) and neutral point CT Download PDF

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Publication number
CN203084141U
CN203084141U CN 201320123836 CN201320123836U CN203084141U CN 203084141 U CN203084141 U CN 203084141U CN 201320123836 CN201320123836 CN 201320123836 CN 201320123836 U CN201320123836 U CN 201320123836U CN 203084141 U CN203084141 U CN 203084141U
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China
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phase
current
generator
main transformer
control
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CN 201320123836
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Chinese (zh)
Inventor
苏恺
许建华
李紫莲
王文军
朱丽均
郑奇伟
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LISHUI POWER BUREAU
State Grid Corp of China SGCC
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LISHUI POWER BUREAU
State Grid Corp of China SGCC
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Priority to CN 201320123836 priority Critical patent/CN203084141U/en
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Abstract

The utility model relates to a polarity test device for transformer bushing CT (Captive Test) and neutral point CT. The polarity test device comprises a three-phase high-voltage generator, a three-phase strong current generator, a main transformer current generator and a control device, wherein the control device is provided with a 380V three-phase alternating current input interface and three 380V three-phase alternating current output interfaces, and the control device with the three 380V three-phase alternating current output interfaces is respectively connected with the three-phase high-voltage generator, the three-phase strong current generator and the main transformer current generator. The polarity test device disclosed by the utility model has the advantages that the three-phase high-voltage generator, the three-phase strong current generator and the main transformer current generator are controlled by the control device, thus the polarity test for the transformer bushing CT and the neutral point CT can be carried out, the detection for a voltage and current circuit by a tester can be very convenient and accurate, the phenomena that a PT (Potential Transformer) is burnt down and the polarity of a main transformer bushing CT secondary circuit is not accurate during a previous transmission and transformation project production process are effectively prevented, and the safety performance is increased.

Description

Transformer bushing CT, neutral point CT polarity test device
Technical field
The utility model relates to transformer bushing CT, neutral point CT polarity test device.
Background technology
The polarity correctness of transformer bushing CT, neutral point CT is directly connected to the protective relaying device correct operation at present, and vital role is extremely arranged in secondary connection.Owing to the restriction of testing equipment, the secondary personnel can't accurately judge the polarity of transformer bushing CT, neutral point CT in the construction debug process, also are difficult to judge exactly by traditional direct-current polarity method of testing the polarity of cannula C T simultaneously.An impedance of transformer is very big, judges polarity chron with the dc-battery group, and the needle deflection of secondary serial connection CT reometer is very little, and can produce superpotential and arcing at cut-off point when disconnecting direct supply, jeopardizes the safety of testing crew.
The utility model content
The technical problems to be solved in the utility model is that the safety that can't accurately detect also possible testing crew under the existent technique condition to the polarity of transformer bushing CT, neutral point CT causes this technical matters of certain threat, and transformer bushing CT, neutral point CT polarity test device are provided.
In order to solve the problems of the technologies described above; the utility model is achieved through the following technical solutions: transformer bushing CT; neutral point CT polarity test device; comprise the three-phase high-voltage generator; the three-phase strong current generator; the main transformer current feedback circuit; control device; described control device is provided with one road 380V three-phase alternating current input interface and three road 380V three-phase alternating current output interfaces; on the described control device of three road 380V three-phase alternating current output interfaces, be connected with the three-phase high-voltage generator respectively; the three-phase strong current generator; the main transformer current feedback circuit; described control device is provided with phase place arbitration functions and overload protection; described three-phase high-voltage generator; the three-phase strong current generator; the main transformer current feedback circuit is equipped with the display device of overload protection and output primary current size; the three-phase output voltage of described three-phase high-voltage generator is up to and is 10kV; the output current of described three-phase strong current generator is more than the 600A, and described main transformer current feedback circuit can produce the above electric current of 10A in the main transformer high-pressure side.
Preferably, described three-phase high-voltage generator is provided with the regulating device I of regulating three-phase high-voltage generator three-phase output voltage, described three-phase strong current generator is provided with regulates three-phase strong current generator three-phase output current regulating device II, described main transformer current feedback circuit is provided with regulates main transformer current feedback circuit three-phase output current regulating device III, be convenient to output voltage, output current regulating, result of use is good.
Preferably, described phase place arbitration functions detects by trigger, also can be convenient to the device that phase place is judged for other, and trigger connects reliable, and result of use is good.
Preferably, described main transformer current feedback circuit is provided with earthing device, has eliminated the remanent magnetism of main transformer current feedback circuit, and result of use is good.
Preferably, also be provided with the gauge tap that control 380V three-phase alternating current input interface is connected on the described control device, security performance is good, good reliability.
In sum, advantage of the present utility model: by control device control three-phase high-voltage generator, three-phase strong current generator, main transformer current feedback circuit, thereby carry out transformer bushing CT, neutral point CT polarity test, testing crew checks that the electric current and voltage loop is very convenient, accurate, avoid effectively in project of transmitting and converting electricity operation process, occurring that PT burns, the incorrect phenomenon of main transformer cannula C T secondary circuit polarity in the past, improved security performance.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the structural representation of the utility model test unit;
Fig. 2 is the structured flowchart of the utility model transformer bushing CT polarity test;
Fig. 3 is the structured flowchart of the utility model transformer neutral point CT polarity test;
Fig. 4 is the structured flowchart of the utility model transformer lines CT polarity test.
Embodiment
As shown in Figure 1; transformer bushing CT; neutral point CT polarity test device; comprise three-phase high-voltage generator 2; three-phase strong current generator 3; main transformer current feedback circuit 4; control device 1; described control device 1 is provided with one road 380V three-phase alternating current input point and three road 380V three-phase alternating current output interfaces; on the described control device 1 of three road 380V three-phase alternating current output interfaces, be connected with three-phase high-voltage generator 2 respectively; three-phase strong current generator 3; main transformer current feedback circuit 4; described control device 1 is provided with phase place arbitration functions 11 and overload protection 12; described three-phase high-voltage generator 2; three-phase strong current generator 3; main transformer current feedback circuit 4 is equipped with the display device 6 of overload protection 5 and output primary current size; the three-phase output voltage of described three-phase high-voltage generator 2 is up to and is 10kV; the output current of described three-phase strong current generator 3 is more than the 600A; described main transformer current feedback circuit 4 can produce the above electric current of 10A in the main transformer high-pressure side; described three-phase high-voltage generator 2 is provided with the regulating device I 21 of regulating three-phase high-voltage generator 2 three-phase output voltages; described three-phase strong current generator 3 is provided with regulates three-phase strong current generator 3 three-phase output current regulating device II 31; described main transformer current feedback circuit 4 is provided with regulates main transformer current feedback circuit 4 three-phase output current regulating device III 41; be convenient to output voltage; output current regulating; result of use is good; described phase place arbitration functions 11 detects by trigger; also can be convenient to the device that phase place is judged for other; trigger connects reliable; result of use is good; described main transformer current feedback circuit 4 is provided with earthing device; eliminated the remanent magnetism of main transformer current feedback circuit 4; result of use is good; also be provided with the gauge tap that control 380V three-phase alternating current input interface is connected on the described control device 1; security performance is good, good reliability.
As described in Figure 2: the test procedure of transformer bushing CT polarity test unit is:
1, checks that associated connections connects back, composite control apparatus 1 power switch that closes, observe the phase-sequence meter indication and confirm that the out-put supply phase place is a positive sequence.
2, the three-phase high-voltage generator is progressively boosted, connect airtight the variation that the electric current of paying close attention to the three-phase high-voltage generator changes and detect the bus secondary voltage.Depart from normal value in case monitor electric current, when busbar voltage did not become corresponding proportion with three-phase voltage generator voltage, the account for voltage loop existed unusual, and testing crew should be checked secondary circuit, find out the trouble spot, can stop the incident generation that PT burns in full voltage starting operation process.
3, confirm that the voltage secondary circuit is correct after; increase the capacity of main transformer current feedback circuit 4 gradually, monitor the three-phase current size closely one time, pay close attention to relevant secondary current situation of change; when secondary current reaches maximum, use the PAM360 phasometer in main transformer protection screen place measuring voltage current phase.When electric current and voltage phase place same-phase can judge comprehensively that the main transformer bushing CT polarity is correct.
As described in Figure 3: the test procedure of bushing shell for transformer neutral point CT polarity test device is: test procedure is consistent with the test of main transformer bushing CT polarity with process of the test, unique difference is 4 output of main transformer current feedback circuit single-phase current, and flows back to the N end of three-phase strong current generator 3 through the main transformer neutral point.
As described in Figure 4: the test procedure of transformer lines CT polarity test device is:
1, checks that associated connections connects back, composite control apparatus 1 power switch that closes, and observe the phase-sequence meter indication and confirm that the out-put supply phase place is a positive sequence.
2, the three-phase high-voltage generator is progressively boosted, connect airtight the variation that the electric current of paying close attention to the three-phase high-voltage generator changes and detect the bus secondary voltage.Depart from normal value in case monitor electric current, when busbar voltage did not become corresponding proportion with three-phase voltage generator voltage, the account for voltage loop existed unusual, and testing crew should be checked secondary circuit, find out the trouble spot, can stop the incident generation that PT burns in start-up course.
3, confirm that the voltage secondary circuit is correct after; increase the capacity of three-phase strong current generator 3 gradually; monitor a three-phase current size closely; pay close attention to relevant secondary current situation of change; when secondary current reaches maximum, use the PAM360 phasometer in line protective devices place measuring voltage current phase.
By control device control three-phase high-voltage generator, three-phase strong current generator, main transformer current feedback circuit, thereby carry out transformer bushing CT, neutral point CT polarity test, testing crew checks that the electric current and voltage loop is very convenient, accurate, avoid effectively in project of transmitting and converting electricity operation process, occurring that PT burns, the incorrect phenomenon of main transformer cannula C T secondary circuit polarity in the past, improved security performance.

Claims (5)

1. transformer bushing CT; neutral point CT polarity test device; it is characterized in that: comprise three-phase high-voltage generator (2); three-phase strong current generator (3); main transformer current feedback circuit (4); control device (1); described control device (1) is provided with one road 380V three-phase alternating current input interface and three road 380V three-phase alternating current output interfaces; on the described control device (1) of three road 380V three-phase alternating current output interfaces, be connected with three-phase high-voltage generator (2) respectively; three-phase strong current generator (3); main transformer current feedback circuit (4); described control device (1) is provided with phase place arbitration functions (11) and overload protection (12); described three-phase high-voltage generator (2); three-phase strong current generator (3); main transformer current feedback circuit (4) is equipped with the display device (6) of overload protection (5) and output primary current size; the three-phase output voltage of described three-phase high-voltage generator (2) is up to and is 10kV; the output current of described three-phase strong current generator (3) is more than the 600A, and described main transformer current feedback circuit (4) can produce the above electric current of 10A in the main transformer high-pressure side.
2. transformer bushing CT according to claim 1, neutral point CT polarity test device, it is characterized in that: described three-phase high-voltage generator (2) is provided with the regulating device I (21) of regulating three-phase high-voltage generator (2) three-phase output voltage, described three-phase strong current generator (3) is provided with regulates three-phase strong current generator (3) three-phase output current regulating device II (31), and described main transformer current feedback circuit (4) is provided with regulates main transformer current feedback circuit (4) three-phase output current regulating device III (41).
3. transformer bushing CT according to claim 1, neutral point CT polarity test device, it is characterized in that: described phase place arbitration functions (11) detects by trigger.
4. transformer bushing CT according to claim 1 and 2, neutral point CT polarity test device, it is characterized in that: described main transformer current feedback circuit (4) is provided with earthing device.
5. transformer bushing CT according to claim 1, neutral point CT polarity test device is characterized in that: also be provided with the gauge tap that control 380V three-phase alternating current input interface is connected on the described control device (1).
CN 201320123836 2013-03-18 2013-03-18 Polarity test device for transformer bushing CT (Captive Test) and neutral point CT Active CN203084141U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320123836 CN203084141U (en) 2013-03-18 2013-03-18 Polarity test device for transformer bushing CT (Captive Test) and neutral point CT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320123836 CN203084141U (en) 2013-03-18 2013-03-18 Polarity test device for transformer bushing CT (Captive Test) and neutral point CT

Publications (1)

Publication Number Publication Date
CN203084141U true CN203084141U (en) 2013-07-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103743994A (en) * 2014-01-27 2014-04-23 广州供电局有限公司 Low-voltage load test method and device
CN107703391A (en) * 2017-10-17 2018-02-16 云南电网有限责任公司电力科学研究院 A kind of secondary circuit detecting system of transformer station
CN109470942A (en) * 2018-03-12 2019-03-15 国网浙江省电力公司金华供电公司 A kind of main transformer attribute testing box and its automatic control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103743994A (en) * 2014-01-27 2014-04-23 广州供电局有限公司 Low-voltage load test method and device
CN103743994B (en) * 2014-01-27 2017-02-01 广州供电局有限公司 Low-voltage load test method and device
CN107703391A (en) * 2017-10-17 2018-02-16 云南电网有限责任公司电力科学研究院 A kind of secondary circuit detecting system of transformer station
CN109470942A (en) * 2018-03-12 2019-03-15 国网浙江省电力公司金华供电公司 A kind of main transformer attribute testing box and its automatic control method

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