CN2847637Y - Device for suppressing transformer neutral point DC current by capacitance method - Google Patents
Device for suppressing transformer neutral point DC current by capacitance method Download PDFInfo
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- CN2847637Y CN2847637Y CN 200520133305 CN200520133305U CN2847637Y CN 2847637 Y CN2847637 Y CN 2847637Y CN 200520133305 CN200520133305 CN 200520133305 CN 200520133305 U CN200520133305 U CN 200520133305U CN 2847637 Y CN2847637 Y CN 2847637Y
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- neutral point
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 14
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 230000009183 running Effects 0.000 claims description 7
- 238000013016 damping Methods 0.000 claims description 5
- 230000005764 inhibitory process Effects 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The utility model discloses a device for suppressing neutral point direct current of a transformer by a capacitance method, which comprises a capacitance loop, a state transition switch loop and an over-voltage by-pass loop, wherein the three loops are connected in parallel and then connected between a neutral point of a transformer and a grounding electrode in series. The utility model has simple structure and safety, and can completely suppress neutral point direct current of the transformer.
Description
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.
Background technology
Along with the construction of China's electrical network, increasing DC power transmission line puts into operation in the nervous relatively area of power load.When DC transmission system one pole the earth moves, the earth electrode current flows into AC system by the transformer neutral point of AC system, to AC transmission system generation 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.Also will build up many DC power transmission line to China's planning in 2010, especially ± the 800KV extra high voltage direct current transmission line.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, by suppressing electric current in the transformer neutral point series resistance, the method is simple, but can not realize thoroughly suppressing the purpose of direct current; 2, the back electromotive force that applies and produce neutral point direct current around transformer neutral point suppresses neutral point direct current, the method device complexity, 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 " method of reverse current method limiting transformer neutral point direct current electric current " in the Chinese invention patent ublic specification of application of CN1625010A, and its technical scheme mainly is: (1) selects an independently compensation of ground utmost point 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 complexity, consumed power is more, nor can realize the inhibition fully to direct current.
Summary of the invention
For overcoming the defective that exists in the above-mentioned prior art, it is a kind of simple in structure, safe and reliable and can suppress the device of transformer neutral point direct current fully that the utility model provides.
The technical solution of the utility model is achieved in that
A kind of capacitance method suppresses the device of transformer neutral point direct current, comprises capacitor loop, state switch loop and overvoltage bypass loop, is connected between transformer neutral point and the earth electrode after described three loop parallel connections.
Described capacitor loop comprises an electric capacity, described state switch loop comprises a state switch, described bypass loop comprises rectifier bridge, thyristor, overvoltage trigger element, inductance and fly-wheel diode, two arms of rectifier bridge and electric capacity, state switch are in parallel, rectifier bridge is connected with thyristor, inductance, thyristor anode and gate pole two ends are parallel with the overvoltage trigger element, and the inductance two ends are parallel with fly-wheel diode.
Described inductance is the switch closure inductance and the damping circuit of series connection.
Described electric capacity two ends overvoltage gap discharge device in parallel.
Described electric capacity two ends zinc oxide over-voltage breakdown discharge loop in parallel.
Described thyristor is the thyristor of two or two above parallel runnings.
Described thyristor overvoltage trigger element is two covers or the above trigger element in parallel of two covers.
Described state switch is biswitch or the multifinger switch of single switch.
The beneficial effects of the utility model are as follows:
1, because the utility model adopts the transformer neutral point series capacitor blocking-up neutral point direct current of direct current is being arranged; and be little capacitive reactance ground connection for alternating current; therefore; this device can suppress the transformer neutral point direct current fully; and guarantee that miscellaneous equipment does not need to carry out parameter adjustment and is mated, especially all relay protection constant values need not reset.
2, because the utility model also utilizes bypass thyristor and state switch to cooperate with capacitor 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 electric capacity two ends, therefore, the reliability height of this device.
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 a structured flowchart of the present 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: 4-overvoltage high-speed switch loop, 1-transformer neutral point 2-capacitor loop 3-state switch loop 5- capacitance 6,61,62-change over switch 7-rectifier bridge 8,81,82-thyristor 9,91,92-overvoltage trigger element 10-inductance 101-switch closure inductance 102-damping circuit 11-fly-wheel diode 12-overvoltage gap discharge device 13-piezo-resistance
Embodiment
As shown in Figure 1, capacitance method suppresses the transformer neutral point flow directing device and comprises capacitor loop 2, state switch loop 3,4 three fundamental circuits of the quick bypass loop of overvoltage, 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 by capacitor loop 2 ground connection, with the electric current of this blocking transformer neutral point.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 by the make and break contact metallic earthing.Under the situation of capacity earth, because of the direct current of transformer neutral point 1 is blocked by capacitor, thereby at capacitor two ends formation voltage.When capacitor voltage at both ends is higher than some voltage limits---during voltage threshold, quick bypass loop 4 conductings of overvoltage, utilize conducting current drives state switch closure simultaneously---enter 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 capacitor two ends, capacitor voltage at both ends just can surmount voltage threshold.
As shown in Figure 2, be the embodiment 1 that capacitance method suppresses transformer neutral point direct current device.Among the figure, bypass loop is made up of rectifier bridge 7, thyristor 8, overvoltage trigger element 9, inductance 10 and fly-wheel diode 11, two arms of rectifier bridge 7 and electric capacity 5, state switch 6 are in parallel, rectifier bridge 7 is connected with thyristor 8, inductance 10, thyristor 8 two ends are parallel with overvoltage trigger element 9, and inductance 10 two ends are parallel with fly-wheel diode 11.
Be connected in series on the transformer neutral point after bypass loop 4 and capacitance 5, state switch 6 are in parallel.Wherein, capacitance 5 plays the effect that suppresses the transformer neutral point direct current, simultaneously neutral point is exchanged Low ESR ground connection.When state switch 6 is in closure state, be direct ground connection running status; When this switch 6 is in off-state, be the capacity earth running status.Rectifier bridge 7 plays voltage reversal effect, and regardless of the polarity of voltage of electric capacity 5 and state switch 6 both sides, rectifier bridge 7 guarantees that the voltage that is applied on the 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 the thyristor 8,9 conductings of overvoltage trigger element also trigger thyristor 8 conductings; When thyristor 8 conductings, the conducting electric current makes inductance 10 excitations and driving condition change over switch 6 thread off closed; When thyristor 8 electric currents descended, fly-wheel diode 7 discharged the electric current of inductance 10 rapidly.
As shown in Figure 3, be the embodiment 2 that capacitance 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 electric capacity 5 two ends, as, piezo-resistance 13 in parallel at electric capacity 5 two ends.
As shown in Figure 4, be the embodiment 3 that capacitance method suppresses transformer neutral point direct current device.When this device was applied to the system with bigger neutral point fault current, on the identical basis of other structure and embodiment 1, thyristor 8 can two or many parallel runnings, to improve the current capacity of device.As Fig. 4, the inhibition transformer neutral point direct current device when being two thyristor 81,82 parallel runnings.
As shown in Figure 5, be the embodiment 4 that capacitance method suppresses transformer neutral point direct current device.On the identical basis of other structure and embodiment 1, adopt two cover thyristor gating circuits, to improve the reliability of overvoltage bypass start-up.
As shown in Figure 6, be the embodiment 7 that capacitance method suppresses transformer neutral point direct current device.On the identical basis of other structure and embodiment 1, state switch can adopt biswitch or single switch multiconductor, with the ability of the closed fault current that improves device.As Fig. 6, be the inhibition transformer neutral point direct current device when adopting biswitch.
Claims (8)
1, a kind of capacitance method suppresses the device of transformer neutral point direct current, it is characterized in that, comprise capacitor loop (2), state switch loop (3) and overvoltage bypass loop (4), be connected between transformer neutral point (1) and the earth electrode after described three loop parallel connections.
2, capacitance method according to claim 1 suppresses the device of transformer neutral point direct current, it is characterized in that, described capacitor loop (2) comprises electric capacity (5), described state switch loop (3) comprises state switch (6), described bypass loop (4) comprises rectifier bridge (7), thyristor (8), overvoltage trigger element (9), inductance (10) and fly-wheel diode (11), two arms of rectifier bridge (7) and electric capacity (5), state switch (6) parallel connection, rectifier bridge (7) and thyristor (8), inductance (10) series connection, thyristor (8) anode and gate pole two ends are parallel with overvoltage trigger element (9), and inductance (10) two ends are parallel with fly-wheel diode (11).
3, capacitance method according to claim 2 suppresses the device of transformer neutral point direct current, it is characterized in that, described inductance (10) is the switch closure inductance (101) and the damping circuit (102) of series connection.
4, capacitance method according to claim 2 suppresses the device of transformer neutral point direct current, it is characterized in that described electric capacity (a 5) two ends overvoltage gap discharge device (12) in parallel.
5, according to the device of claim 2 or 4 described capacitance methods inhibition transformer neutral point direct currents, it is characterized in that described electric capacity (5) two ends zinc oxide over-voltage breakdown discharge loop in parallel.
6, capacitance method according to claim 2 suppresses the device of transformer neutral point direct current, it is characterized in that described thyristor (8) is the thyristor of two or two above parallel runnings.
7, capacitance method according to claim 2 suppresses the device of transformer neutral point direct current, it is characterized in that, described thyristor overvoltage trigger element (9) is two covers or the above trigger element (91,92) in parallel of two covers.
8, suppress the device of transformer neutral point direct current according to the capacitance method described in the claim 2, it is characterized in that described state switch (6) is biswitch or the multifinger switch of single switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520133305 CN2847637Y (en) | 2005-11-18 | 2005-11-18 | Device for suppressing transformer neutral point DC current by capacitance method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520133305 CN2847637Y (en) | 2005-11-18 | 2005-11-18 | Device for suppressing transformer neutral point DC current by capacitance method |
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| CN2847637Y true CN2847637Y (en) | 2006-12-13 |
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| CN 200520133305 Expired - Lifetime CN2847637Y (en) | 2005-11-18 | 2005-11-18 | Device for suppressing transformer neutral point DC current by capacitance method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100574038C (en) * | 2007-03-30 | 2009-12-23 | 马志强 | A kind of electric potential compensation process of subduing high-voltage grid transformer neutral point direct current electric current |
| CN102255595A (en) * | 2011-08-01 | 2011-11-23 | 辽宁省电力有限公司抚顺供电公司 | Method for suppressing the DC magnetic biasing of transformer |
| 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 |
| CN101383500B (en) * | 2008-07-03 | 2012-10-03 | 上海市电力公司 | Method for suppressing neutral point DC magnetic biasing by single grounding network and device thereof |
| CN102832607A (en) * | 2011-06-15 | 2012-12-19 | 西门子公司 | Quick bypass device |
| CN103222145A (en) * | 2010-07-20 | 2013-07-24 | 恩普里默斯有限责任公司 | Continuous uninterruptable AC grounding system for power system protection |
| CN103368155A (en) * | 2013-07-09 | 2013-10-23 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| 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 |
| CN108599127A (en) * | 2018-06-27 | 2018-09-28 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point direct current decoupling device |
| CN108896892A (en) * | 2018-08-30 | 2018-11-27 | 北京中联太信科技有限公司 | TXLR type effectively earthed system direct current decoupling device |
| CN109103861A (en) * | 2018-08-13 | 2018-12-28 | 广州供电局有限公司 | Inhibit the device of AC transformer neutral point direct current and alternating current |
| CN111712982A (en) * | 2018-02-23 | 2020-09-25 | 通用电器技术有限公司 | Fault handling |
| CN113078622A (en) * | 2021-04-26 | 2021-07-06 | 金华电力设计院有限公司 | Resistance type direct current magnetic biasing suppression system |
-
2005
- 2005-11-18 CN CN 200520133305 patent/CN2847637Y/en not_active Expired - Lifetime
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100574038C (en) * | 2007-03-30 | 2009-12-23 | 马志强 | A kind of electric potential compensation process of subduing high-voltage grid transformer neutral point direct current electric current |
| CN101383500B (en) * | 2008-07-03 | 2012-10-03 | 上海市电力公司 | Method for suppressing neutral point DC magnetic biasing by single grounding network and device thereof |
| CN103222145B (en) * | 2010-07-20 | 2016-08-17 | 恩普里默斯有限责任公司 | The most uninterrupted AC earthed system for protecting electrical power system |
| CN103222145A (en) * | 2010-07-20 | 2013-07-24 | 恩普里默斯有限责任公司 | Continuous uninterruptable AC grounding system for power system protection |
| CN102832607A (en) * | 2011-06-15 | 2012-12-19 | 西门子公司 | Quick bypass device |
| CN102255595A (en) * | 2011-08-01 | 2011-11-23 | 辽宁省电力有限公司抚顺供电公司 | Method for suppressing the DC magnetic biasing of transformer |
| 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 |
| CN103368155A (en) * | 2013-07-09 | 2013-10-23 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103368155B (en) * | 2013-07-09 | 2015-06-24 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| 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 |
| CN111712982A (en) * | 2018-02-23 | 2020-09-25 | 通用电器技术有限公司 | Fault handling |
| CN111712982B (en) * | 2018-02-23 | 2023-11-07 | 通用电器技术有限公司 | Fault handling |
| CN108599127A (en) * | 2018-06-27 | 2018-09-28 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point direct current decoupling device |
| CN109103861A (en) * | 2018-08-13 | 2018-12-28 | 广州供电局有限公司 | Inhibit the device of AC transformer neutral point direct current and alternating current |
| CN108896892A (en) * | 2018-08-30 | 2018-11-27 | 北京中联太信科技有限公司 | TXLR type effectively earthed system direct current decoupling device |
| CN108896892B (en) * | 2018-08-30 | 2024-05-31 | 北京中联太信科技有限公司 | TXLR type direct current decoupling device for effective grounding system |
| CN113078622A (en) * | 2021-04-26 | 2021-07-06 | 金华电力设计院有限公司 | Resistance type direct current magnetic biasing suppression system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140307 Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140307 |
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| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100085 HAIDIAN, BEIJING TO: 100031 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140307 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Address before: 100085 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee before: China Electric Power Research Institute |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061213 |
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| EXPY | Termination of patent right or utility model |