CN202602252U - Device for suppressing direct current at neutral point of transformer by adjustable resistor method - Google Patents

Device for suppressing direct current at neutral point of transformer by adjustable resistor method Download PDF

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Publication number
CN202602252U
CN202602252U CN 201220263809 CN201220263809U CN202602252U CN 202602252 U CN202602252 U CN 202602252U CN 201220263809 CN201220263809 CN 201220263809 CN 201220263809 U CN201220263809 U CN 201220263809U CN 202602252 U CN202602252 U CN 202602252U
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CN
China
Prior art keywords
neutral point
direct current
loop
adjustable resistance
transformer
Prior art date
Application number
CN 201220263809
Other languages
Chinese (zh)
Inventor
韩洪刚
张巍
李胜川
杜彦强
于长广
谢诚
王伟涛
程春和
罗斌
王飞
李爽
冯占稳
赵勇超
鲁旭臣
毕海涛
杨鹤
Original Assignee
东北电力科学研究院有限公司
南京南瑞集团公司
辽宁省电力有限公司电力科学研究院
国家电网公司
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Priority to CN201220097239 priority Critical
Priority to CN201220097239.1 priority
Application filed by 东北电力科学研究院有限公司, 南京南瑞集团公司, 辽宁省电力有限公司电力科学研究院, 国家电网公司 filed Critical 东北电力科学研究院有限公司
Priority to CN 201220263809 priority patent/CN202602252U/en
Application granted granted Critical
Publication of CN202602252U publication Critical patent/CN202602252U/en

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Abstract

The utility model relates to a device for suppressing direct current at a neutral point of a transformer by during high voltage power transmission and transformation, in particular to a device for suppressing direct current at a neutral point of a transformer by an adjustable resistor method. The device for suppressing the direct current at the neutral point of the transformer by the adjustable resistor method comprises an adjustable resistor circuit, a status changing-over switch circuit and an overvoltage bypass circuit, wherein the adjustable resistor circuit, the status changing-over switch circuit and the overvoltage bypass circuit are connected in parallel with one another and then connected in series between the neutral point of the transformer and a grounding electrode; and the adjustable resistor circuit is in a range from 0 to 4 Ohms. By the device, series resistors at the neutral point of a direct current transformer blocks direct current at the neutral point, so that a resistance value can be set to suppress direct current at the neutral point of the transformer, a phenomenon that parameters of other equipment are required to be adjusted to match with the resistance value can be avoided, and particularly all relay protection setting values are not required to be reset. When the status changing-over switch circuit is in a breaking status, the neutral point of the transformer is grounded through the adjustable resistor circuit, so that the current at the neutral point of the transformer is blocked. The device for suppressing the direct current at the neutral point of the transformer by the adjustable resistor method is simple in structure and high in reliability, and reliability of starting an overvoltage bypass is improved.

Description

A kind of adjustable resistance method suppresses the device of transformer neutral point direct current
Technical field
The utility model relates to the device that suppresses the transformer neutral point direct current in a kind of high voltage power transmission and transforming process, relates in particular to the device that a kind of adjustable resistance method suppresses the transformer neutral point direct current.
Background technology
Along with the particularly breakthrough of device for high-power power electronic technology of the development of modern science and technology, direct current transportation is big with its transmission capacity, cost is low, loss is little, it is aging to be difficult for, the life-span is long and fed distance is unrestricted etc., and numerous advantages obtain increasing development.As far back as the eighties in 20th century, China has begun to build DC engineering.Planned by China in 2010 and to have built up many DC power transmission lines, especially ± the 800KV extra high voltage direct current transmission line.According to planning, before the year two thousand twenty, China also will build a series of high voltage direct current transmission projects (about 30, comprise ± 500kV, ± 660kV, ± 800kV, ± the 1000kV DC transmission engineering).As: Xi Luodu-West Zhejiang Province (± 800kV/ ± 1000kV), Xi Luodu-Zhuzhou (± 660kV), Yunnan-Guangdong the 2nd time (± 800kV) etc.When DC transmission system one pole the earth moves; The earth electrode current flows into AC system through the transformer neutral point of AC system; AC transmission system is produced influence in various degree, especially produce magnetic biasing after the AC transformer neutral point stack DC component, cause magnetic saturation; In AC system, produce harmonic wave, vibration and noise, influenced the safe and stable operation of AC system.Therefore, it will be more and more obvious to the influence of ac transmission that direct current send electricity, to the also generation thus of research of transformer neutral point direct current.
At present; The method that suppresses the transformer neutral point direct current mainly contains: 1, the separated straight method of electric capacity: through suppressing electric current in the transformer neutral point series capacitance; The method can thoroughly suppress direct current; But simultaneously this electric current is repelled in other grounding apparatuss fully, possibly work the mischief other equipment; 2, the separated straight method of resistance: through suppressing electric current at transformer neutral point series connection small resistor, the method can suppress direct current in various degree through the different resistance resistance of flexible configuration, and transformer neutral point electric current in the system all is configured in below the lsafety level.3, the reverse injection method of direct current: the back electromotive force that around transformer neutral point, applies and produce neutral point direct current suppresses neutral point direct current, and the method device is complicated, and consumed power is more, can not realize the inhibition fully to direct current.
Publication number is to have put down in writing a kind of " reverse current method limiting transformer neutral point direct current method of current " in the Chinese invention patent ublic specification of application of CN1625010A, and its technical scheme mainly is: an independently compensation of ground utmost point is selected in (1) outside electric substation; (2) with the direct current generating means " " end is connected with the compensation of ground utmost point independently, " output " of direct current generating means is held and is connected with the neutral point of transformer grounding; (3) transformer neutral point direct current detection measurement device transformer neutral point direct current obtains neutral point direct current current value and direction; (4) controller of direct current generating means starts the direct current generating means automatically to the transformer neutral point injection electric current opposite with D.C. magnetic biasing.Though this method is not changed the original wiring that becomes device, the effect of offsetting D.C. magnetic biasing is obvious,, the method device is complicated, and consumed power is more, nor can realize the inhibition fully to direct current.
Summary of the invention
In order to solve the problems of the technologies described above, the device that the utility model provides a kind of adjustable resistance method to suppress the transformer neutral point direct current is to have simple in structurely, safe and reliable, and can flexible configuration suppresses the device of transformer neutral point direct current.
The technical scheme of the utility model is achieved in that
A kind of adjustable resistance method suppresses the device of transformer neutral point direct current, comprises adjustable resistance loop, state switch loop and overvoltage bypass loop, is connected between transformer neutral point and the earth electrode after said three loop parallel connections; Described adjustable resistance loop value range is 0 ~ 4 Ω.
Said overvoltage bypass loop comprises rectifier bridge, first thyristor, the first overvoltage trigger element, inductance and fly-wheel diode; Two arms of rectifier bridge and adjustable resistance loop, state switch loop are parallelly connected; Rectifier bridge is connected with first thyristor, inductance; The first thyristor two ends are parallel with the first overvoltage trigger element, and the inductance two ends are parallel with fly-wheel diode.
Said inductance is the switch closure inductance and the damping circuit of series connection.
Said adjustable resistance loop is overvoltage gap discharge device of resistance two ends parallel connection.
Said adjustable resistance loop is zinc oxide over-voltage breakdown discharge loop of resistance two ends parallel connection.
Said adjustable resistance loop is zinc oxide over-voltage breakdown discharge loop of resistance two ends parallel connection.
Said first thyristor is the thyristor of two or two above parallel runnings.
The said thyristor first overvoltage trigger element is the second overvoltage trigger element and the 3rd overvoltage trigger element of two cover parallel connections.
Said first change over switch is biswitch or the multifinger switch of single switch.
The beneficial effect of the utility model is following:
1, because the utility model is employed in the transformer neutral point resistors in series blocking-up neutral point direct current of direct current; Therefore; This device can be provided with resistance and suppress the transformer neutral point direct current; And guarantee that miscellaneous equipment need not carry out parameter adjustment and be mated, especially all relay protection constant values need not reset.When state switch was in the disjunction state, transformer neutral point was through adjustable resistance loop ground connection, with the electric current of this blocking transformer neutral point.
2, because the utility model also utilizes bypass thyristor and state switch to cooperate with resistor simultaneously, therefore, when neutral point overvoltage occurring, can realize metallic earthing safely and reliably rapidly.
3, because the utility model can increase overvoltage gap discharge device or zinc oxide over-voltage breakdown discharge loop at the resistance two ends, therefore, the reliability of this device is high.
4, because the utility model adopts two cover thyristor gating circuits, therefore improved the reliability of overvoltage bypass start-up.
5, because the utility model state switch can adopt biswitch or single switch multiconductor, therefore, can improve the closed fault current ability of this device.
Description of drawings
Fig. 1 is the structured flowchart of the utility model;
Fig. 2 is the circuit structure diagram of the utility model embodiment one;
Fig. 3 is the circuit structure diagram of the utility model embodiment two;
Fig. 4 is the circuit structure diagram of the utility model embodiment three;
Fig. 5 is the circuit structure diagram of the utility model embodiment four;
Fig. 6 is the circuit structure diagram of the utility model embodiment five.
Among the figure: transformer neutral point 1, adjustable resistance loop 2, state switch loop 3, overvoltage bypass loop 4 is at a distance from straight resistance 5; First change over switch, 6, the second change over switches, 61, the three change over switches 62, rectifier bridge 7; First thyristor, 8, the second thyristors, 81, the three thyristors, 82, the first overvoltage trigger elements 9; The second overvoltage trigger element, 91, the three overvoltage trigger elements 92, inductance 10, switch closure inductance 101; Damping circuit 102, fly-wheel diode 11, overvoltage gap discharge device 12, piezo-resistance 13.
Embodiment
The utility model is the device that a kind of adjustable resistance method suppresses the transformer neutral point direct current; As shown in Figure 1; The utility model comprises adjustable resistance loop 2, state switch loop 3,4 three fundamental circuits of overvoltage bypass loop; An end is connected in series on the transformer neutral point 1 other end ground connection after these three loop parallel connections.When state switch was in the disjunction state, transformer neutral point was through adjustable resistance loop 2 ground connection, and with the electric current of this blocking transformer neutral point, described adjustable resistance loop 2 value ranges are 0 ~ 4 Ω.State switch loop 3 is made up of the switch of may command closure/disjunction, and its state has determined the running status of device; When switch closure, all devices of device are by bypass, and transformer neutral point is through the make and break contact metallic earthing.Under the situation of grounding through resistance,, thereby form voltage at the resistor two ends because of the direct current of transformer neutral point 1 is suppressed by resistor.When the resistor voltage is higher than some voltage limits---during voltage threshold, 4 conductings of overvoltage bypass loop, utilize conducting current drives state switch closed simultaneously---get into direct ground state.Because therefore voltage threshold, has only when AC system generation three-phase imbalance fault far above the ceiling voltage that direct current system forms at the resistor two ends, the resistor voltage just can surmount voltage threshold.
Embodiment 1:
As shown in Figure 2, Fig. 2 is the circuit structure diagram of the utility model embodiment one.Among the figure; Bypass loop is made up of rectifier bridge 7, first thyristor 8, the first overvoltage trigger element 9, inductance 10 and fly-wheel diode 11; Two arms of rectifier bridge 7 and adjustable resistance loop 2, state switch loop 3 are parallelly connected; Rectifier bridge 7 is connected with first thyristor 8, inductance 10, and first thyristor, 8 two ends are parallel with the first overvoltage trigger element 9, and inductance 10 two ends are parallel with fly-wheel diode 11.
Bypass loop 4 with after straight resistance 5, first change over switch 6 are parallelly connected, be connected in series on the transformer neutral point.Wherein, play the effect that suppresses the transformer neutral point direct current, simultaneously neutral point is exchanged Low ESR ground connection at a distance from straight resistance 5.When state first change over switch 6 is in closure state, be direct ground connection running status; When this first change over switch 6 is in off-state, be the resistance running status.Rectifier bridge 7 plays voltage reversal effect, and regardless of the polarity of voltage of resistance 5 and state first change over switch 6 both sides, rectifier bridge 7 guarantees that the voltage that is applied on first thyristor 8 is that anode just connects, and negative electrode connects negative; Be higher than trigger gate in limited time when being applied to voltage on first thyristor 8,9 conductings of the first overvoltage trigger element also trigger 8 conductings of first thyristor; When 8 conductings of first thyristor, the conducting electric current makes inductance 10 excitations and driving condition change over switch 6 thread off closed; When first thyristor, 8 electric currents descended, fly-wheel diode 11 discharged the electric current of inductance 10 rapidly.
Inductance 10 among Fig. 2 can be the switch closure inductance 101 and damping circuit 102 of series connection, and wherein, switch closure inductance 101 is used for when quick bypass start-up, utilizes first thyristor, 8 conducting current drives, first change over switch, 6 closures; Damping circuit 102 is used to suppress the climbing speed of first thyristor, 8 conducting electric currents, plays protection first thyristor 8.
Embodiment 2:
As shown in Figure 3, Fig. 3 is the circuit structure diagram of the utility model embodiment two.Be the embodiment 2 that electric-resistivity method suppresses transformer neutral point direct current device.On the identical basis of other structure and embodiment 1, be the reliability that increases device, can increase an overvoltage gap discharge device 12 or zinc oxide over-voltage breakdown discharge loop at resistance 5 two ends, as, piezo-resistance 13 of parallel connection at resistance 5 two ends.
Embodiment 3:
As shown in Figure 4, Fig. 4 is the circuit structure diagram of the utility model embodiment three.When this device was applied to the system with bigger neutral point fault current, on the identical basis of other structure and embodiment 1, first thyristor 8 can two or many parallel runnings, to improve the current capacity of device.Like Fig. 4, the inhibition transformer neutral point direct current device when being 82 parallel runnings of two thyristors, second thyristor, 81, the three thyristors.
Embodiment 4:
As shown in Figure 5, Fig. 5 is the circuit structure diagram of the utility model embodiment four.On the identical basis of other structure and embodiment 1; Adopt two cover thyristor gating circuits; Be second overvoltage trigger element 91 and the three overvoltage trigger element 92 of the thyristor first overvoltage trigger element 9, to improve the reliability of overvoltage bypass start-up for two cover parallel connections.
Embodiment 5:
As shown in Figure 6, Fig. 6 is the circuit structure diagram of the utility model embodiment five.On the identical basis of other structure and embodiment 1, state switch i.e. first change over switch 6 can adopt biswitch or the multifinger switch of single switch, i.e. second change over switch 61 and the 3rd change over switch 62 are with the ability of the closed fault current of raising device.Like Fig. 6, be the inhibition transformer neutral point direct current device when adopting biswitch.

Claims (9)

1. an adjustable resistance method suppresses the device of transformer neutral point direct current; It is characterized in that: comprise adjustable resistance loop (2), state switch loop (3) and overvoltage bypass loop (4), be connected between transformer neutral point (1) and the earth electrode after said three loop parallel connections; Described adjustable resistance loop (2) value range is 0 ~ 4 Ω.
2. a kind of adjustable resistance method according to claim 1 suppresses the device of transformer neutral point direct current; It is characterized in that: said overvoltage bypass loop (4) comprises rectifier bridge (7), first thyristor (8), the first overvoltage trigger element (9), inductance (10) and fly-wheel diode (11); Two arms of rectifier bridge (7) and adjustable resistance loop (2), state switch loop (3) are parallelly connected; Rectifier bridge (7) is connected with first thyristor (8), inductance (10); First thyristor (8) two ends are parallel with the first overvoltage trigger element (9), and inductance (10) two ends are parallel with fly-wheel diode (11).
3. a kind of adjustable resistance method according to claim 2 suppresses the device of transformer neutral point direct current, it is characterized in that: said inductance (10) is the switch closure inductance (101) and the damping circuit (102) of series connection.
4. according to the device of claim 2 or 3 described a kind of adjustable resistance methods inhibition transformer neutral point direct currents, it is characterized in that: said adjustable resistance loop (2) is resistance (5) two ends parallel connection overvoltage gap discharge devices (12).
5. according to the device of claim 2 or 3 described a kind of adjustable resistance methods inhibition transformer neutral point direct currents, it is characterized in that said adjustable resistance loop (2) is zinc oxide over-voltage breakdown discharge loops of resistance (5) two ends parallel connection.
6. a kind of adjustable resistance method according to claim 4 suppresses the device of transformer neutral point direct current, it is characterized in that: said adjustable resistance loop (2) is zinc oxide over-voltage breakdown discharge loop of resistance (5) two ends parallel connection.
7. suppress the device of transformer neutral point direct current according to the described a kind of adjustable resistance method of each claim in the claim 1,2,3,6, it is characterized in that: said first thyristor (8) is the thyristor of two or two above parallel runnings.
8. suppress the device of transformer neutral point direct current according to the described a kind of adjustable resistance method of each claim in the claim 1,2,3,6, it is characterized in that: the said thyristor first overvoltage trigger element (9) is the second overvoltage trigger element (91) and the 3rd overvoltage trigger element (92) of two cover parallel connections.
9. a kind of adjustable resistance method according to claim 7 suppresses the device of transformer neutral point direct current, and it is characterized in that: said first change over switch (6) is biswitch or the multifinger switch of single switch.
CN 201220263809 2012-03-15 2012-06-06 Device for suppressing direct current at neutral point of transformer by adjustable resistor method CN202602252U (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201220097239 2012-03-15
CN201220097239.1 2012-03-15
CN 201220263809 CN202602252U (en) 2012-03-15 2012-06-06 Device for suppressing direct current at neutral point of transformer by adjustable resistor method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709881A (en) * 2012-03-15 2012-10-03 东北电力科学研究院有限公司 Device utilizing adjustable resistance method to curb DC of neutral point of transformer

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CN103560500B (en) * 2013-11-05 2016-08-17 国家电网公司 The energy-conservation choosing method of substation grounding transformer grounding resistance
CN103647268A (en) * 2013-12-14 2014-03-19 国家电网公司 Selection method of 110 kV power distribution network neutral resistor
CN104575992A (en) * 2013-12-19 2015-04-29 国家电网公司 Online monitoring and isolation device for direct current magnetic bias of power transformer
CN104465052A (en) * 2014-11-19 2015-03-25 广州高澜节能技术股份有限公司 Transformer neutral point resistance type direct current suppression device
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
CN105048437B (en) * 2015-09-03 2018-08-24 芜湖科越电气有限公司 A kind of combined type neutral ground composite control apparatus
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
CN107670203A (en) * 2017-09-14 2018-02-09 国网山东省电力公司汶上县供电公司 Electric substation's disaster prevention system and method
WO2021043269A1 (en) * 2019-09-06 2021-03-11 嘉兴山蒲照明电器有限公司 Surge protection circuit, power supply device using same, and led illumination device

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CN2847637Y (en) * 2005-11-18 2006-12-13 中国电力科学研究院 Device for suppressing transformer neutral point DC current by capacitance method
CN201118203Y (en) * 2007-11-15 2008-09-17 上海市电力公司超高压输变电公司 Device for suppressing transformer noise arousing from dc magnetic bias
CN101710697B (en) * 2009-11-17 2012-05-16 江苏省电力试验研究院有限公司 Device and method for inhibiting direct current of neutral point of transformer
CN202602252U (en) * 2012-03-15 2012-12-12 东北电力科学研究院有限公司 Device for suppressing direct current at neutral point of transformer by adjustable resistor method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709881A (en) * 2012-03-15 2012-10-03 东北电力科学研究院有限公司 Device utilizing adjustable resistance method to curb DC of neutral point of transformer
CN102709881B (en) * 2012-03-15 2015-04-22 东北电力科学研究院有限公司 Device utilizing adjustable resistance method to curb DC of neutral point of transformer

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20171206

Address after: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39

Co-patentee after: NARI Technology Development Co., Ltd.

Patentee after: Northeast Electric Power Research Institute Co., Ltd.

Co-patentee after: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute

Co-patentee after: State Grid Corporation of China

Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39

Co-patentee before: Nanjing Nari Co., Ltd.

Patentee before: Northeast Electric Power Research Institute Co., Ltd.

Co-patentee before: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute

Co-patentee before: State Grid Corporation of China

Effective date of registration: 20171206

Address after: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39

Co-patentee after: NARI Technology Development Co., Ltd.

Patentee after: Northeast Electric Power Research Institute Co., Ltd.

Co-patentee after: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute

Co-patentee after: State Grid Corporation of China

Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39

Co-patentee before: Nanjing Nari Co., Ltd.

Patentee before: Northeast Electric Power Research Institute Co., Ltd.

Co-patentee before: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute

Co-patentee before: State Grid Corporation of China

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20121212

Termination date: 20200606