CN203631282U - DC magnetic bias online monitoring and separating device of power transformer - Google Patents

DC magnetic bias online monitoring and separating device of power transformer Download PDF

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Publication number
CN203631282U
CN203631282U CN201320838601.0U CN201320838601U CN203631282U CN 203631282 U CN203631282 U CN 203631282U CN 201320838601 U CN201320838601 U CN 201320838601U CN 203631282 U CN203631282 U CN 203631282U
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CN
China
Prior art keywords
transformer
current
pass switch
magnetic bias
voltage
Prior art date
Application number
CN201320838601.0U
Other languages
Chinese (zh)
Inventor
于永军
祁晓笑
焦春雷
刘勇
茅东
侯志远
王亮
Original Assignee
国家电网公司
国网新疆电力公司电力科学研究院
安徽正广电电力技术有限公司
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Priority to CN201320838601.0U priority Critical patent/CN203631282U/en
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Publication of CN203631282U publication Critical patent/CN203631282U/en

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Abstract

The utility model relates to a DC magnetic bias online monitoring and separating device of a power transformer. The DC magnetic bias online monitoring and separating device comprises a separation device and a magnetic bias online monitoring device. The separation device comprises a block condenser C, a voltage-limiting protector FR connected in parallel with the block condenser C, an alternating-current transformer Ta, an AC/DC current transformer Tb and a by-pass switch K. The magnetic bias online monitoring device comprises a by-pass switch Kz1, a digital monitoring device Kz2, a communication terminal WL connected with the output end of the digital monitoring device Kz2, and a isolation transformer GT connected with the by-pass switch Kz1 and the digital monitoring device Kz2. By means of the DC magnetic bias online monitoring and separating device, the voltage class of the block condenser C is reduced, reliability and short-circuit impact resistance of the device are improved, the largest short-circuit impact current can be 125 kA, and the DC magnetic bias online monitoring and separating device can be applied to neutral-point grounding loops of extra-high voltage or extreme-high voltage large or giant transformers; noise of the transformers is effectively lowered, and temperature raising of the transformers is restrained.

Description

A kind of on-line monitoring of power transformer D.C. magnetic biasing and spacer assembly
Technical field
The utility model relates to the primary equipment monitoring and protecting field in high voltage dc transmission technology, relates in particular to a kind of on-line monitoring and spacer assembly of power transformer D.C. magnetic biasing.
Background technology
In recent years, super high voltage direct current electricity transmission is efficient with it, the feature of economy is applied in China's long distance powedr transmission, and China's super high voltage direct current electricity transmission technology has reached the leading level in the world.Along with increasing DC power transmission line puts into operation, China's electrical network presents the new situation of AC and DC coexistence of systems.DC transmission system unavoidably can be moved under one pole the earth mode, when high-voltage dc transmission electric monopole ground return circuit mode is moved, earth electrode earth current can produce a powerful current field at utmost point location periphery, due to the variation of the earth soil resistivity, the neutral-point solid ground transformer of earth electrode periphery diverse location is in current potential differently, the part earth current of earth electrode is by from higher transformer neutral point inflow transformer three phase windings of earth potential, again through alternating current circuit, then by the lower Three-Phase Transformer winding of earth potential, click and enter ground by neutrality, thereby formation DC loop, being AC system provides a passage more easily circulating than the earth for earth current.The direct current very little (being tens amperes to the maximum) that general power transformer can bear, in the time having the direct current inflow transformer that is greater than power transformer ability to bear, can cause the saturated of transformer core, can there is magnetic bias in transformer, its exciting current and harmonic wave will sharply be increased, saturated, temperature rise unshakable in one's determination, noise and vibration increase and produce high order harmonic component, endanger the safe and stable operation of transformer and electric power system.
For fear of near the extremely power transformer generation D.C. magnetic biasing of direct current, guarantee the safe and stable operation of transformer, need to monitor flowing into transformer neutral point DC current, thereby judge accurately transformer DC magnetic bias level, provide in time transformer DC magnetic bias alarm, remind relevant operations staff to take measures to suppress magnetic bias direct current.Meanwhile, transformer bias direct current is carried out to on-line monitoring, also administer and lay a good foundation for the D.C. magnetic biasing in later stage.
Utility model content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of on-line monitoring and spacer assembly of power transformer D.C. magnetic biasing are provided, this device adopts all energy matching techniques of high accuracy direct current Sampling techniques, high-speed intelligent vacuum circuit-breaker and extensive zinc oxide, reduce the electric pressure of block capacitor, reliability and the Short Circuit withstand impact capacity of device are improved, maximum Short Circuit withstand impulse current can reach 200kA, can be used in the neutral ground loop of the large-scale or huge transformer of high pressure, superhigh pressure and even ultra high voltage.
The utility model is to be achieved through the following technical solutions:
The on-line monitoring of power transformer D.C. magnetic biasing and a spacer assembly, comprise transformer, spacer assembly, magnetic bias on-Line Monitor Device; The input of the output access spacer assembly of described transformer; Described spacer assembly comprises block capacitor C, voltage-limiting protector FR, AC current transformer Ta, ac and dc current transmitter Tb and the by-pass switch K in parallel with block capacitor C, described by-pass switch K is in parallel with voltage-limiting protector FR, and described AC current transformer Ta and ac and dc current transmitter Tb are connected in series and ground connection; Described magnetic bias on-Line Monitor Device comprises by-pass switch controller Kz1, digital monitor Kz2, the communication terminal WL being connected with digital monitor Kz2 output and the isolating transformer GT being connected with by-pass switch controller Kz1, digital monitor Kz2 respectively.
As optimal technical scheme of the present utility model, the input of described digital monitor Kz2 connects three road signals, first via signal is directly connected to the output of transformer, the second road signal is the voltage signal through the 0-700V of block capacitor C output, and Third Road signal is the ac and dc current signal of ac and dc current transmitter Tb of flowing through; Operational order is passed to by-pass switch controller Kz1 by the output of described digital monitor Kz2, and by-pass switch controller Kz1 receives current signal acting in conjunction from AC current transformer Ta in by-pass switch K simultaneously.
Its operation principle is: in the time that magnetic bias on-Line Monitor Device detects in transformer neutral point not greatly direct current (or direct current is less than set point), by-pass switch K is normally closed operating state, and transformer neutral point is by by-pass switch K ground connection; In the time that magnetic bias on-Line Monitor Device has detected that direct current (or being greater than set point) is flowed through transformer neutral point, by-pass switch K opens, and capacitance C is connected in series in grounded circuit, works the function that suppresses direct current; After direct current disappears, the lower voltage on block capacitor C is below set point, and by-pass switch K closes a floodgate, and by block capacitor short circuit, exits every straight function; In the time of system generation single-phase earthing unsymmetrical short-circuit, the impulse current block capacitor C that flows through, rises rapidly the voltage on block capacitor C, triggers voltage-limiting protector FR conducting, and limit the voltage at block capacitor C two ends, play the effect of protection block capacitor C; When short circuit current changes to first zero crossing moment, by-pass switch controller Kz1 closes a floodgate, and short circuit current is diverted in switch.
Compared with prior art, the beneficial effects of the utility model are: the utility model has reduced the electric pressure of block capacitor C, reliability and the Short Circuit withstand impact capacity of device are improved, maximum Short Circuit withstand impulse current can reach 125kA, can be used in the neutral ground loop of the large-scale or huge transformer of high pressure, superhigh pressure and even ultra high voltage; Effectively reduce the noise of transformer, suppressed the rising of its temperature.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, Fig. 1 is structural representation of the present utility model.
The on-line monitoring of described a kind of power transformer D.C. magnetic biasing and spacer assembly, comprise transformer, spacer assembly, magnetic bias on-Line Monitor Device; The input of the output access spacer assembly of described transformer; Described spacer assembly comprises block capacitor C, voltage-limiting protector FR, AC current transformer Ta, ac and dc current transmitter Tb and the by-pass switch K in parallel with block capacitor C, described by-pass switch K is in parallel with voltage-limiting protector FR, and described AC current transformer Ta and ac and dc current transmitter Tb are connected in series and ground connection; Described magnetic bias on-Line Monitor Device comprises by-pass switch controller Kz1, digital monitor Kz2, the communication terminal WL being connected with digital monitor Kz2 output and the isolating transformer GT being connected with by-pass switch controller Kz1, digital monitor Kz2 respectively.The input of described digital monitor Kz2 connects three road signals, first via signal is directly connected to the output of transformer, the second road signal is the voltage signal through the 0-700V of block capacitor C output, and Third Road signal is the ac and dc current signal of ac and dc current transmitter Tb of flowing through; Operational order is passed to by-pass switch controller Kz1 by the output of described digital monitor Kz2, and by-pass switch controller Kz1 receives current signal acting in conjunction from AC current transformer Ta in by-pass switch K simultaneously.
Transformer neutral point magnetic bias on-Line Monitor Device is by high speed, sampling with high precision device, and Arithmetic Processing Chip, and high sensitivity electric current on a large scale, voltage sensor device form, and algorithm is accurate, and strict logic is processed in real time, and criterion parameter is adjustable, facilitates scene to adjust.Transformer neutral point magnetic bias on-Line Monitor Device has Chinese LCDs, conveniently checks on the spot operational factor, and is equipped with communication module, and the data that monitor can be uploaded to back-stage management PC at a distance, backstage also can this monitoring device of remote control.This monitoring device compact conformation, advanced technology, has 485 communication ports, and host computer can conduct interviews to controller by this communication port, and controller provides answer signal, thereby obtains the running status of this engraving device.Host computer also can send control command to device by this communication port; Magnetic bias on-Line Monitor Device is furnished with communication interface, can connect wireless or optic module, realizes remote monitoring, and the control interface with D.C. magnetic biasing spacer assembly is provided.
The electric parameter of spacer assembly of the present utility model is as follows:
System frequency: 50 ± 2Hz
Use electric pressure: 110kV and more than
Earthing reactance:
Power frequency reactance under built-in high speed by-pass switch disjunction state: 0.1~1.0 Ω;
Power frequency reactance: < 0.02 Ω under built-in high speed by-pass switch "on" position;
Short-circuit impact electric current :≤200KA;
Short circuit current :≤80KA;
Device Uc under straight operating mode: < 160V
Device secondary and insulation level: 2KV1min once or between ground
Isolation becomes level of isolation: 42KV1min
The environment for use of spacer assembly of the present utility model is as follows:
Height above sea level :≤3000m
Ambient temperature :-40 ℃~60 ℃
25 ℃ of maximum temperature difference per day: <
Relative humidity :≤85% (25 ℃)
Place to use: open air
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims (2)

1. the on-line monitoring of power transformer D.C. magnetic biasing and a spacer assembly, is characterized in that, comprises transformer, spacer assembly, magnetic bias on-Line Monitor Device; The input of the output access spacer assembly of described transformer; Described spacer assembly comprises block capacitor C, voltage-limiting protector FR, AC current transformer Ta, ac and dc current transmitter Tb and the by-pass switch K in parallel with block capacitor C, described by-pass switch K is in parallel with voltage-limiting protector FR, and described AC current transformer Ta and ac and dc current transmitter Tb are connected in series and ground connection; Described magnetic bias on-Line Monitor Device comprises by-pass switch controller Kz1, digital monitor Kz2, the communication terminal WL being connected with digital monitor Kz2 output and the isolating transformer GT being connected with by-pass switch controller Kz1, digital monitor Kz2 respectively.
2. the on-line monitoring of a kind of power transformer D.C. magnetic biasing according to claim 1 and spacer assembly, it is characterized in that, the input of described digital monitor Kz2 connects three road signals, first via signal is directly connected to the output of transformer, the second road signal is the voltage signal through the 0-700V of block capacitor C output, and Third Road signal is the ac and dc current signal of ac and dc current transmitter Tb of flowing through; Operational order is passed to by-pass switch controller Kz1 by the output of described digital monitor Kz2, and by-pass switch controller Kz1 receives current signal acting in conjunction from AC current transformer Ta in by-pass switch K simultaneously.
CN201320838601.0U 2013-12-19 2013-12-19 DC magnetic bias online monitoring and separating device of power transformer CN203631282U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320838601.0U CN203631282U (en) 2013-12-19 2013-12-19 DC magnetic bias online monitoring and separating device of power transformer

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104466907A (en) * 2014-11-19 2015-03-25 广州高澜节能技术股份有限公司 Transformer neutral point capacitance type DC blocking device
CN104810793A (en) * 2015-04-23 2015-07-29 许继集团有限公司 Transformer neutral point direct current blocking device
CN105048435A (en) * 2015-08-10 2015-11-11 中国南方电网有限责任公司电网技术研究中心 Suppression device for direct-current biasing current of transformer and control method
CN105048431A (en) * 2015-08-10 2015-11-11 中国南方电网有限责任公司电网技术研究中心 Suppression device for DC biasing current of transformer
CN107332211A (en) * 2017-06-28 2017-11-07 大连理工大学 A kind of capacitance-resistance type transformer DC magnetic bias restraining device
CN107453326A (en) * 2017-08-23 2017-12-08 全球能源互联网研究院 The protection device and micro-capacitance sensor of a kind of grounding transformer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104466907A (en) * 2014-11-19 2015-03-25 广州高澜节能技术股份有限公司 Transformer neutral point capacitance type DC blocking device
CN104810793A (en) * 2015-04-23 2015-07-29 许继集团有限公司 Transformer neutral point direct current blocking device
CN104810793B (en) * 2015-04-23 2018-03-02 许继集团有限公司 A kind of transformer neutral point direct current blocking device
CN105048435A (en) * 2015-08-10 2015-11-11 中国南方电网有限责任公司电网技术研究中心 Suppression device for direct-current biasing current of transformer and control method
CN105048431A (en) * 2015-08-10 2015-11-11 中国南方电网有限责任公司电网技术研究中心 Suppression device for DC biasing current of transformer
CN105048431B (en) * 2015-08-10 2018-09-18 中国南方电网有限责任公司电网技术研究中心 A kind of DC magnetic bias current restraining device of transformer
CN105048435B (en) * 2015-08-10 2018-09-18 中国南方电网有限责任公司电网技术研究中心 A kind of transformer DC magnetic bias current restraining device and control method
CN107332211A (en) * 2017-06-28 2017-11-07 大连理工大学 A kind of capacitance-resistance type transformer DC magnetic bias restraining device
CN107332211B (en) * 2017-06-28 2019-01-25 大连理工大学 A kind of capacitance-resistance type transformer DC magnetic bias inhibition device
CN107453326A (en) * 2017-08-23 2017-12-08 全球能源互联网研究院 The protection device and micro-capacitance sensor of a kind of grounding transformer

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