CN201197073Y - Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube - Google Patents
Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube Download PDFInfo
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- CN201197073Y CN201197073Y CNU2008200803344U CN200820080334U CN201197073Y CN 201197073 Y CN201197073 Y CN 201197073Y CN U2008200803344 U CNU2008200803344 U CN U2008200803344U CN 200820080334 U CN200820080334 U CN 200820080334U CN 201197073 Y CN201197073 Y CN 201197073Y
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- excitation winding
- ground
- flashover
- zinc oxide
- winding sleeve
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Abstract
The utility model relates to a circuit for detecting a line-to-ground flashover of an excitation winding sleeve of a magnetically controlled parallel reactor, which is characterized in that in an excess voltage protection loop which consists of a serially connected direct current bus contactor branch circuit, a serially connected thyristor control absorbing resistor branch circuit, and a serially connected zinc oxide lightning arrester. The three branch circuits are connected in parallel between a triphase bridge type full control rectifier and an MCSR excitation winding, the direct current bus contactor, the thyristor control absorbing resistor and the zinc oxide lightning arrestor are grounded after the centers thereof are connected, and the grounding position is connected with current sensing element. No matter where the flashover occurs on the excitation winding sleeve, the failure current can be detected at the grounding position of the center of the excess voltage protection loop through the excess current sensing element. Therefore, the circuit is simple in configuration, low in insulation level requirements, low in detection cost, and has an important meaning for the development of the industrialization of the magnetically controlled parallel reactor.
Description
Technical field
The utility model relates to a kind of relaying protection testing circuit, particularly about a kind of magnetic control type paralleling reactor field excitation winding sleeve pipe flashover testing circuit over the ground.
Background technology
In superhigh pressure, extra-high voltage grid, controlled reactor can effectively solve the contradiction between over-voltage and the reactive power compensation, is the indispensable technological means of superhigh pressure, extra-high voltage grid, has broad application prospects.Magnetic control type paralleling reactor changes magnetic saturation degree unshakable in one's determination by changing the size of DC excitation electric current, thus can be continuously steady its reactance value of rapid adjustment, thereby have very superior control performance.But because magnetic control type paralleling reactor belongs to the high-impedance transformer type; short-circuit impedance very big (can design reach or near 100%); and the excitation winding short-circuit conditions belongs to one of operating mode of magnetic control type paralleling reactor; take place because of overvoltage at the excitation winding sleeve pipe under the situation of flashover, insulation damages over the ground; be difficult for detecting fault by conventional means; thereby can't provide reliable protection to reactor effectively, become the difficult problem that magnetic control type paralleling reactor is applied.
Summary of the invention
At the problems referred to above, the purpose of this utility model is to propose a kind of magnetic control type paralleling reactor field excitation winding sleeve pipe flashover detection electric current over the ground that is used for.
For achieving the above object; the utility model is taked following technical scheme: a kind of magnetic control type paralleling reactor field excitation winding sleeve pipe is the flashover testing circuit over the ground; it is characterized in that: by the dc bus contactor branch road that is connected in series; in the overvoltage protection loop that thyristor control absorption resistance branch road that is connected in series and the zinc oxide arrester branch road that is connected in series are formed; described three branch roads are connected in parallel between three-phase bridge fully controlled rectifier device and the MCSR excitation winding; and with the dc bus contactor; ground connection after the mid point of thyristor control absorption resistance and zinc oxide arrester links to each other, the place connects a current sensing described ground connection.
Described current sensing is a kind of in current transformer, shunt and the Hall sensor.
The utility model is owing to take above technical scheme; it has the following advantages: because the utility model has utilized the difference of circuit parallel branch internal impedance; constitute the loop by two earth points; extract fault signature dexterously; no matter at the excitation winding sleeve pipe flashover takes place Anywhere; can detect fault current in overvoltage protection loop neutral earthing place; solved the magnetic control type paralleling reactor field excitation winding sleeve pipe problem of flashover detection over the ground; and configuration is simple; and ground connection place insulation level requires low; the detection cost is low, and the protection and even the magnetic control type paralleling reactor industrialized development of magnetic control type paralleling reactor field excitation winding is of great importance.
Description of drawings
Fig. 1 is an electrical wiring schematic diagram of magnetic control type paralleling reactor
Fig. 2 is the utility model principle schematic of flashover detection over the ground
Embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.
As shown in Figure 1, the magnetic control type paralleling reactor core construction is special, is single-phase four-column type structure, a coaxial winding (i.e. net side winding) and the secondary winding (being excitation winding) of being wound with on each stem; The magnetic control type paralleling reactor mode of connection is special, and net side winding adopts the Y-connection mode to insert electrical network, after each branch's triangle of excitation winding connects, and two open delta inverse parallels, and then link to each other with the DC excitation branch road.As shown in Figure 1, L
A1, L
B1, L
C1, L
A2, L
B2, L
C2Be respectively the net side branch winding of each single-phase reactor, L
A1, L
B1, L
C1, L
A2, L
B2, L
C2Be respectively the excitation branch winding of each single-phase reactor, B
A1, B
B1, B
C1And B
A2, B
B2, B
C2Be respectively the three-phase bypass breaker that is connected in parallel on the excitation winding, ZD is the three-phase controllable silicon rectifier, L
nBe the little reactance of neutral point.Net side winding adopts the star connection, Y connection mode to insert electrical network, and neutral point is through little reactor ground connection.Excitation winding is delta connection, links to each other with the DC excitation branch road after two open delta inverse parallels.To be excitation winding lead-in wire pass the insulation protection sleeve pipe of fuel tank cap in the fuel tank with the excitation winding sleeve pipe of magnetic control type paralleling reactor; be the current-carrying element of controllable parallel reactors, play fixing controllable parallel reactors excitation winding lead-in wire and make the effect of lead-in wire insulation against ground.
Because the particularity of the magnetic control type paralleling reactor core construction and the mode of connection, so its protection configuration is also more special.As shown in Figure 2; the overvoltage protection loop mainly comprises the dc bus contactor branch road that is connected in series, the thyristor that is connected in series control absorption resistance branch road and the zinc oxide arrester branch road that is connected in series; three branch roads are connected in parallel, and are connected in parallel between three-phase bridge fully controlled rectifier device and the MCSR excitation winding.Ground connection after intermediate connection point A, B, the C of dc bus contactor, thyristor control absorption resistance and zinc oxide arrester (MOV) links to each other, the place is provided with a current sensing ground connection.
The excitation winding sleeve pipe is in when flashover does not take place over the ground, and whole field excitation branch line is only at overvoltage protection loop midpoint one point earth, and there is not earth current in this place because of not constituting the loop.Before arcing fault took place over the ground excitation winding sleeve pipe any one (the D place is an example in Fig. 2), the current potential at D place was not an earth potential.When flashover takes place, the thyristor conducting of overvoltage protection loop, flashover point D and neutral earthing place of overvoltage protection loop constitute the loop, and is inevitable at protection loop neutral earthing place generation electric current.By detection, can realize the differentiation of arcing fault over the ground of magnetic control type paralleling reactor field excitation winding sleeve pipe to earth current.
During the utility model work:
If when flashover did not take place over the ground, whole field excitation branch line was only at overvoltage protection loop midpoint one point earth, there is not earth current in this place because of not constituting the loop, and current sensing detects less than electric current, so be judged as normal.
If when flashover takes place over the ground; the thyristor conducting of overvoltage protection loop; flashover point constitutes the loop with neutral earthing place of overvoltage protection loop; inevitable at overvoltage protection loop neutral earthing place generation electric current; current sensing detects electric current, so be judged as the excitation winding sleeve pipe arcing fault over the ground takes place.
No matter at the excitation winding sleeve pipe flashover takes place Anywhere, can detect fault current in overvoltage protection loop neutral earthing place by current sensing, thereby configuration is simple, and it is low to locate the insulation level requirement, it is low to detect cost.
Claims (2)
1. magnetic control type paralleling reactor field excitation winding sleeve pipe flashover testing circuit over the ground; it is characterized in that: in the overvoltage protection loop of forming by the dc bus contactor branch road that is connected in series, the thyristor control absorption resistance branch road that is connected in series and the zinc oxide arrester branch road that is connected in series; described three branch roads are connected in parallel between three-phase bridge fully controlled rectifier device and the MCSR excitation winding; and with the mid point of dc bus contactor, thyristor control absorption resistance and the zinc oxide arrester back ground connection that links to each other, at described ground connection place's connection one current sensing.
2. as the above-mentioned a kind of magnetic control type paralleling reactor field excitation winding sleeve pipe of claim 1 flashover testing circuit over the ground, it is characterized in that: described current sensing is a kind of in current transformer, shunt and the Hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200803344U CN201197073Y (en) | 2008-04-30 | 2008-04-30 | Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200803344U CN201197073Y (en) | 2008-04-30 | 2008-04-30 | Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201197073Y true CN201197073Y (en) | 2009-02-18 |
Family
ID=40416702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200803344U Expired - Lifetime CN201197073Y (en) | 2008-04-30 | 2008-04-30 | Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube |
Country Status (1)
| Country | Link |
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| CN (1) | CN201197073Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148503A (en) * | 2010-02-08 | 2011-08-10 | 芮骏 | Automatic adjusting and controlling device for electricity energy quality |
| CN101887085B (en) * | 2009-05-11 | 2013-04-03 | 武汉特试特电气有限公司 | Zinc oxide arrester DC characteristic testing device and method |
| CN106093726A (en) * | 2016-06-27 | 2016-11-09 | 柳州电器科学研究所有限公司 | The method of inspection of 500kV shunt reactor protection device |
| CN108233802A (en) * | 2016-12-15 | 2018-06-29 | 中电普瑞科技有限公司 | A kind of magnet controlled controllable parallel reactors |
| CN109164338A (en) * | 2018-07-20 | 2019-01-08 | 中国船舶重工集团公司第七O三研究所无锡分部 | A kind of high-power middle straightening with on-line monitoring function drains off formula load device |
| CN110445111A (en) * | 2019-08-02 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of magnetic control type paralleling reactor control winding DC bus overvoltage protection system |
-
2008
- 2008-04-30 CN CNU2008200803344U patent/CN201197073Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887085B (en) * | 2009-05-11 | 2013-04-03 | 武汉特试特电气有限公司 | Zinc oxide arrester DC characteristic testing device and method |
| CN102148503A (en) * | 2010-02-08 | 2011-08-10 | 芮骏 | Automatic adjusting and controlling device for electricity energy quality |
| CN106093726A (en) * | 2016-06-27 | 2016-11-09 | 柳州电器科学研究所有限公司 | The method of inspection of 500kV shunt reactor protection device |
| CN108233802A (en) * | 2016-12-15 | 2018-06-29 | 中电普瑞科技有限公司 | A kind of magnet controlled controllable parallel reactors |
| CN109164338A (en) * | 2018-07-20 | 2019-01-08 | 中国船舶重工集团公司第七O三研究所无锡分部 | A kind of high-power middle straightening with on-line monitoring function drains off formula load device |
| CN110445111A (en) * | 2019-08-02 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of magnetic control type paralleling reactor control winding DC bus overvoltage protection system |
| CN110445111B (en) * | 2019-08-02 | 2021-08-27 | 南京南瑞继保电气有限公司 | Magnetic control type shunt reactor control winding direct current bus overvoltage protection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090218 |