CN104465052A - Transformer neutral point resistance type direct current suppression device - Google Patents
Transformer neutral point resistance type direct current suppression device Download PDFInfo
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- CN104465052A CN104465052A CN201410663755.XA CN201410663755A CN104465052A CN 104465052 A CN104465052 A CN 104465052A CN 201410663755 A CN201410663755 A CN 201410663755A CN 104465052 A CN104465052 A CN 104465052A
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Abstract
The invention discloses a transformer neutral point resistance type direct current suppression device. The transformer neutral point resistance type direct current suppression device comprises a resistor, a mechanical bypass switch, a thyristor valve, an electric reactor, a controller, an alternating current transformer and a direct current transformer. The thyristor valve and the electric reactor are connected in series to form a quick bypass circuit. The resistor, the quick bypass circuit and the mechanical bypass switch are connected in parallel, one end is connected with a wire inlet end, and the other end is connected with the alternating current transformer and the direct current transformer in series and connected with a wire outlet end. The controller is used for receiving signals acquired by the alternating current transformer and the direct current transformer and has the detection, control protection and communication functions. The device can suppress direct currents flowing through a transformer neutral point so as to make the direct currents meet the requirements for normal operation of a transformer; the direct current and alternating current monitoring function can be achieved, in addition, a direct current suppression mode and a grounding protection mode can be switched by switching the resistor, switching operation is quick, and the requirements for an electric system are met.
Description
Technical field
The present invention relates to transformer neutral point and press down straight device, particularly transformer neutral point resistance-type presses down straight device.
Background technology
When HVDC (High Voltage Direct Current) transmission system is run in one pole the earth mode, near direct current grounding pole, just there is direct current to flow in AC transformer through directly grounded neutral point from ground, cause transformer DC magnetic bias problem.Strong solar windstorm can change the earth potential of diverse location, makes to there is potential difference between the earth of diverse location, thus makes to be connected to the alternating current circuit of diverse location and transformer has direct current.Between transformer neutral point and earth electrode, seal in resistor, the direct current flowing through transformer neutral point can be suppressed, direct current is limited within the sustainable scope of transformer, thus play the object of administering transformer DC magnetic bias.Resistance-type presses down straight device needs when there being direct current and resistor is put into operation, suppressing direct current, when there being the emergencies such as big current imbalance fault, needing the direct ground connection of fast quick-recovery, in order to avoid make control, the protective device generation misoperation of electric power system.
Summary of the invention
The shortcoming that the object of the invention is to overcome above-mentioned prior art provides a kind of transformer neutral point resistance-type to press down straight device.
For solving the problem, the technical solution used in the present invention is:
A kind of transformer neutral point resistance-type presses down straight device, comprises resistor, mechanical bypass switch, thyristor valve, reactor, controller, AC current transformer and DC current transformer;
Described thyristor valve and reactor are composed in series quick bypass circuit, and thyristor valve is made up of diode rectifier bridge and thyristor;
Described resistor, fast bypass circuit and mechanical bypass switch in parallel, connection end of incoming cables, one end, the other end and AC current transformer and DC current transformer are connected in series leading-out terminal;
Described resistor group is for suppressing the direct current flowing through transformer neutral point;
Described mechanical bypass switch is used for dropping into, excising resistor;
Described quick bypass circuit is used for excising resistor fast;
Described DC current transformer is for gathering the direct current of transformer neutral point;
Described AC current transformer is for gathering the alternating current of transformer neutral point;
Described controller is for receiving the signal of DC current transformer and AC current transformer collection, and controling appliance is for detection, Control protection and communication function.
In order to better realize the present invention, described a kind of transformer neutral point resistance-type presses down straight device and also comprises discharging gap, and discharging gap is in parallel with resistor, fast bypass circuit and mechanical bypass switch, for the backup protection as resistor.
In order to better realize the present invention, described thyristor anode is connected with the DC side positive pole of diode rectifier bridge, thyristor negative electrode is connected with the DC side negative pole of diode rectifier bridge, one end of reactor is connected with AC one end of diode rectifier bridge, the other end of reactor is connected with end of incoming cables, and the AC other end of diode rectifier bridge is connected with leading-out terminal.
In order to better realize the present invention, described thyristor anode is connected with the DC side positive pole of diode rectifier bridge, thyristor negative electrode is connected with the DC side negative pole of diode rectifier bridge by reactor, and AC one end of diode rectifier bridge is connected with end of incoming cables, and the other end is connected with leading-out terminal.
Whether device can detect transformer neutral point DC current automatically, decide resistor put into operation according to direct current; By mechanical bypass switch point incompatible, resistor group is dropped into, out of service, effectively can suppress the direct current (namely administering transformer DC magnetic bias) flowing through transformer neutral point; Under transformer neutral point big current failure condition; the quick bypass circuit be composed in series by thyristor valve and reactor can fast conducting; thus make the direct ground connection of the fast quick-recovery of transformer neutral point, do not affect the main protection in electric power system and backup protection correct operation.
The present invention compared with prior art, tool has the following advantages and beneficial effect: this transformer neutral point resistance-type presses down the direct current that straight device both can realize suppressing to flow through transformer neutral point, makes it to meet the requirement (D.C. magnetic biasing improvement) that transformer normally runs; Direct current, monitoring alternating current function can also be realized, can realize by switching resistor the switching suppressing direct current pattern and ground protection pattern in addition; By isolated DC current-mode switch to enter ground protection pattern time, switch rapidly, meet power system requirements.This programme is simple and reliable, easy to maintenance, is suitable for applying.
Accompanying drawing explanation
Fig. 1 is the theory diagram that described in the embodiment of the present invention 1, a kind of transformer neutral point resistance-type presses down straight device;
Fig. 2 is the theory diagram that described in the embodiment of the present invention 2, a kind of transformer neutral point resistance-type presses down straight device.
Embodiment
Below in conjunction with embodiment and accompanying drawing, embodiments of the present invention are described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of transformer neutral point resistance-type presses down straight device, comprises resistor 1, mechanical bypass switch 2, thyristor valve 4, reactor 5, controller 6, AC current transformer 7 and DC current transformer 8;
Described thyristor valve 4 is composed in series quick bypass circuit with reactor 5, and thyristor valve 4 is made up of diode rectifier bridge 9 and thyristor 10;
Described resistor 1, fast bypass circuit and mechanical bypass switch 2 in parallel, connection end of incoming cables, one end, the other end and AC current transformer 7 and DC current transformer 8 are connected in series leading-out terminal;
Described resistor group 1 is for suppressing the direct current flowing through transformer neutral point;
Described mechanical bypass switch 2 is for dropping into, excising resistor;
Described quick bypass circuit is used for excising resistor fast;
Described AC current transformer 7 is for gathering the alternating current of transformer neutral point;
Described DC current transformer 8 is for gathering the direct current of transformer neutral point;
Described controller 6 is for receiving the signal of DC current transformer and AC current transformer collection, and controling appliance is for detection, Control protection and communication function.
In order to better realize the present invention, described a kind of transformer neutral point resistance-type presses down straight device and also comprises discharging gap 3, and discharging gap 3 is in parallel with resistor 1, fast bypass circuit and mechanical bypass switch 2, for the backup protection as resistor 1.
In order to better realize the present invention, described thyristor 10 anode is connected with the DC side positive pole of diode rectifier bridge 9, thyristor 10 negative electrode is connected with the DC side negative pole of diode rectifier bridge 9, one end of reactor 5 is connected with AC one end of diode rectifier bridge 9, the other end of reactor 5 is connected with end of incoming cables, and the AC other end of diode rectifier bridge 9 is connected with leading-out terminal.
In order to better realize the present invention, described thyristor 10 anode is connected with the DC side positive pole of diode rectifier bridge 9, thyristor 10 negative electrode is connected with the DC side negative pole of diode rectifier bridge 9 by reactor 5, AC one end of diode rectifier bridge 9 is connected with end of incoming cables, and the other end is connected with leading-out terminal.
Embodiment 2
As shown in Figure 2, described thyristor 10 anode is connected with the DC side positive pole of diode rectifier bridge 9, thyristor 10 negative electrode is connected with the DC side negative pole of diode rectifier bridge 9 by reactor 5, AC one end of diode rectifier bridge 9 is connected with end of incoming cables, the other end is connected with leading-out terminal, and all the other are with embodiment 1.
Transformer neutral point resistance-type presses down straight device when normally running, and device is in and suppresses direct current pattern, and separately, resistor 1 puts into operation mechanical bypass switch 2, and direct current is limited in the scope that transformer can tolerate; In ground protection pattern, mechanical bypass switch 2 closes, and the direct ground connection of transformer neutral point, does not affect electric power system and respectively protect and backup protection action; By suppression direct current pattern switch to enter ground protection pattern time, switch rapidly, meet power system requirements; AC current transformer 7, DC current transformer 8 are embedded in device outlet; The standby detection of controling appliance, Control protection, communication function.So this device can either realize suppressing direct current (D.C. magnetic biasing improvement), again can direct current, monitoring alternating current function.
Claims (4)
1. transformer neutral point resistance-type presses down a straight device, it is characterized in that: comprise resistor, mechanical bypass switch, thyristor valve, reactor, controller, AC current transformer and DC current transformer;
Described thyristor valve and reactor are composed in series quick bypass circuit, and thyristor valve is made up of diode rectifier bridge and thyristor;
Described resistor, fast bypass circuit and mechanical bypass switch in parallel, connection end of incoming cables, one end, the other end and AC current transformer and DC current transformer are connected in series leading-out terminal;
Described resistor group is for suppressing the direct current flowing through transformer neutral point;
Described mechanical bypass switch is used for dropping into, excising resistor;
Described quick bypass circuit is used for excising resistor fast;
Described DC current transformer is for gathering the direct current of transformer neutral point;
Described AC current transformer is for gathering the alternating current of transformer neutral point;
Described controller is for receiving the signal of DC current transformer and AC current transformer collection, and controling appliance is for detection, Control protection and communication function.
2. a kind of transformer neutral point resistance-type presses down straight device according to claim 1; it is characterized in that: described a kind of transformer neutral point resistance-type presses down straight device and also comprises discharging gap; discharging gap is in parallel with resistor, fast bypass circuit and mechanical bypass switch, for the backup protection as resistor.
3. a kind of transformer neutral point resistance-type presses down straight device according to claim 1, it is characterized in that: described thyristor anode is connected with the DC side positive pole of diode rectifier bridge, thyristor negative electrode is connected with the DC side negative pole of diode rectifier bridge, one end of reactor is connected with AC one end of diode rectifier bridge, the other end of reactor is connected with end of incoming cables, and the AC other end of diode rectifier bridge is connected with leading-out terminal.
4. a kind of transformer neutral point resistance-type presses down straight device according to claim 1, it is characterized in that: described thyristor anode is connected with the DC side positive pole of diode rectifier bridge, thyristor negative electrode is connected with the DC side negative pole of diode rectifier bridge by reactor, AC one end of diode rectifier bridge is connected with end of incoming cables, and the other end is connected with leading-out terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410663755.XA CN104465052A (en) | 2014-11-19 | 2014-11-19 | Transformer neutral point resistance type direct current suppression device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663755.XA CN104465052A (en) | 2014-11-19 | 2014-11-19 | Transformer neutral point resistance type direct current suppression device |
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| CN104465052A true CN104465052A (en) | 2015-03-25 |
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| CN201410663755.XA Pending CN104465052A (en) | 2014-11-19 | 2014-11-19 | Transformer neutral point resistance type direct current suppression device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446709A (en) * | 2019-01-17 | 2020-07-24 | 国网新疆电力有限公司电力科学研究院 | Resistance-type electric wire netting GIC administers device |
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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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 |
| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device 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 |
| CN202712844U (en) * | 2012-03-15 | 2013-01-30 | 东北电力科学研究院有限公司 | Device for suppressing transformer neutral point DC current by resistance method, with bypass protection function |
| JP2013169088A (en) * | 2012-02-16 | 2013-08-29 | Hitachi Ltd | Power converter, dc substation, dc power transmission system and control method of power converter |
| CN204257374U (en) * | 2014-11-19 | 2015-04-08 | 广州高澜节能技术股份有限公司 | A kind of transformer neutral point resistance-type presses down straight device |
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2014
- 2014-11-19 CN CN201410663755.XA patent/CN104465052A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device of transformer |
| JP2013169088A (en) * | 2012-02-16 | 2013-08-29 | Hitachi Ltd | Power converter, dc substation, dc power transmission system and control method of power converter |
| 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 |
| CN202712844U (en) * | 2012-03-15 | 2013-01-30 | 东北电力科学研究院有限公司 | Device for suppressing transformer neutral point DC current by resistance method, with bypass protection function |
| CN204257374U (en) * | 2014-11-19 | 2015-04-08 | 广州高澜节能技术股份有限公司 | A kind of transformer neutral point resistance-type presses down straight device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446709A (en) * | 2019-01-17 | 2020-07-24 | 国网新疆电力有限公司电力科学研究院 | Resistance-type electric wire netting GIC administers device |
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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Effective date of registration: 20160729 Address after: 510663, science and Technology Industrial Development Zone, Guangdong, Guangzhou Province, science, South Road, No. five, cloud 3 Applicant after: Guangzhou Goaland Energy Conservation Tech Co., Ltd. Address before: 510663, science and Technology Industrial Development Zone, Guangdong, Guangzhou Province, science, South Road, No. five, cloud 3 Applicant before: Guangzhou Goaland Energy Conservation Tech Co., Ltd. Applicant before: Guangzhou Smart Grid Information Technology Co., Ltd. |
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Application publication date: 20150325 |
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