CN202616762U - Direct current magnetic bias restraining device of transformer - Google Patents
Direct current magnetic bias restraining device of transformer Download PDFInfo
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- CN202616762U CN202616762U CN 201220305315 CN201220305315U CN202616762U CN 202616762 U CN202616762 U CN 202616762U CN 201220305315 CN201220305315 CN 201220305315 CN 201220305315 U CN201220305315 U CN 201220305315U CN 202616762 U CN202616762 U CN 202616762U
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- current transformer
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- 230000000452 restraining effect Effects 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 230000004224 protection Effects 0.000 claims abstract description 11
- 102100026656 Actin, alpha skeletal muscle Human genes 0.000 claims abstract description 10
- 101000834207 Homo sapiens Actin, alpha skeletal muscle Proteins 0.000 claims abstract description 10
- 102100036732 Actin, aortic smooth muscle Human genes 0.000 claims abstract description 7
- 101000929319 Homo sapiens Actin, aortic smooth muscle Proteins 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 230000005283 ground state Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to a direct current magnetic bias restraining device of a transformer. The direct current magnetic bias restraining device comprises a group of parallel capacitors, a parallel end of a capacitor group is connected with a capacitance current transformer ACTA2 in series, and the capacitance current transformer ACTA2 is connected with a direct current current transformer DCTA and a by-pass switch current transformer ACTA1 which are connected in series. A voltage transformer TV1, a voltage transformer TV2, a discharging gap FD and a by-pass mechanical switch QF are connected between the by-pass switch current transformer ACTA1 is connected with the other parallel end of the capacitor group in parallel, simultaneously two ends of the by-pass mechanical switch QF are further connected with an electric reactor L1-L3, reverse parallel connection thyristor T1-T6 and a trigger circuit of the thyristor T1-T6 in parallel, and the electric reactor L1-L3, reverse parallel connection thyristor T1-T6 and the trigger circuit are respectively connected with the electric reactor L1-L3 in series. The direct current current transformer DCTA, the by-pass switch current transformer ACTA1, the voltage transformer TV1, the voltage transformer TV2 and the trigger circuit of the thyristor T1-T6 are further connected with a measurement and control protection unit. The direct current magnetic bias restraining device simplifies structures and improves reliability and intellectuality of a system.
Description
Technical field
The utility model relates to a kind of transformer DC magnetic bias restraining device.
Background technology
When DC transmission system adopts the ground return circuit operational mode; The huge direct current that from the earth, flows through fails to be convened for lack of a quorum near AC system is exerted an influence; Particularly can produce more serious D.C. magnetic biasing to the direct grounding transformer of neutral point, the reactive power consumption that this has not only increased transformer influences the normal operation of transformer; Cause protective relaying maloperation; But also can cause that harmonic wave significantly raises, other electric equipments are produced considerable influence, thereby directly have influence on the safe operation in transformer station, power plant.
Increasing along with China's high voltage direct current transmission project; DC transmission engineering one pole one pole the earth operation total time that the maintenance of time and annual DC power transmission line causes of putting into operation is also more and more longer; And the big earthed return operational mode of DC transmission system is as the fault emergency mode; Basically inevitable, therefore, transformer DC magnetic bias suppresses technology and more and more comes into one's own.But existing magnetic bias restraining device needs extra commutating circuit and thyristor turn-off circuit, and comparatively complicated on the structure, reliability is relatively poor.
The utility model content
The purpose of the utility model is exactly for addressing the above problem; A kind of transformer DC magnetic bias restraining device is provided; It is rational in infrastructure, owing to do not need extra commutating circuit and thyristor turn-off circuit, the topological structure of major loop is able to a large amount of simplification; Simultaneously because adopted the analog protection circuit of pure hardware and the complete dualization redundancy structure of Microcomputer Protection, improved the reliability of system and intelligent.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of transformer DC magnetic bias restraining device, it comprises the capacitor of one group of parallel connection, a parallel connected end of capacitor group is connected with capacitance current instrument transformer ACTA2; Capacitance current instrument transformer ACTA2 is connected with DC current transformer DCTA, the by-pass switch current transformer ACTA1 of series connection;
Be parallel with voltage transformer TV1, TV2, discharging gap FD, bypass mechanical switch QF between by-pass switch current transformer ACTA1 and another parallel connected end of capacitor group, simultaneously bypass mechanical switch QF two ends also are parallel with reactor L1-L3 and the thyristor T1-T6 and the circuits for triggering thereof of the reverse parallel connection of connecting respectively with reactor L1-L3;
DC current transformer DCTA, by-pass switch current transformer ACTA1, voltage transformer TV1, TV2, thyristor T1-T6 circuits for triggering also are connected with the monitoring and protection unit.
Said DC current transformer DCTA is connected with transformer neutral point earthed switch K1 one end; Parallel connected end of capacitor group is connected with transformer neutral point earthed switch K1 through device switching knife switch K2, and transformer neutral point earthed switch K1 is connected with transformer 220KV side.
The utility model utilizes capacitor stopping direct current, the logical electrical characteristic that exchanges; Between main transformer neutral point and earth electrode, connect behind the installing capacitor; Can eliminate the direct current that flows through transformer neutral point effectively, and the alternating current that does not influence neutral point is through capacitor grounding.Under some improper situation, such as exchanging fault, thunderbolt etc., the main transformer neutral point can flow through very big earth current; And produce the very high transient voltage of amplitude, might damage capacitor, current bypass loop of parallel connection at the capacitor two ends; The electric current that perhaps flows through capacitor when voltage across capacitor is above behind the setting; Electric current passes through bypass protection loop stream mistake, thereby with the capacitor bypass, has limited the transient voltage amplitude at capacitor two ends.
After device was linked into transformer neutral point, in order to influence or do not influence system as far as possible littlely, under the normal state of system, the capacitor of device will be by bypass, the direct ground connection of transformer neutral point.If direct current appears in transformer neutral point, capacitor will drop into automatically; If transformer neutral point bigger short-circuit current occurs or the capacitor terminal voltage raises fast simultaneously in the process that capacitor puts into operation, capacitor can be by bypass, neutral-point solid ground, thus avoid capacitor to damage because of overload.
The beneficial effect of utility model is:
1) is employed in the transformer neutral point series capacitance at a distance from straight solution, constitutes triple bypass protections loop by thyristor, high-speed switch, discharging gap;
2) capacitor is full membrane structure, and the proof voltage grade is high, and capacity is undamped, safety, reliability height;
3) utilize the special-purpose permanent-magnetic switching of capacitor switching to realize the state exchange of direct ground connection and capacitor grounding, speed is fast, capacity is big;
4) under the capacity earth state, when neutral point overvoltage, convert direct ground state into, change-over time, the changing voltage thresholding can pass through the wire jumper setting less than 20uS;
5) under the capacity earth state, neutral point exchanges capacitance to earth less than 1.2 Ω, and relaying protection and other automatics do not need to adjust again;
6) embedded measurement and control unit detects neutral point current or voltage according to different operation states, realizes the running status conversion of automatic or manual; Embedded record ripple unit, the variation of device running status and neutral point current, change in voltage situation when the record electric parameter is out-of-limit are for operating analysis provides foundation.
7) utilize computer remote terminal to realize that a remote monitoring terminal can be monitored multiple arrangement simultaneously to supervision, the control of device.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Among Fig. 1, K1 is transformer neutral point earthed switch (an original place cutter), and K2 is device switching knife switch (newly cutter, the client provides for oneself).The device part comprises: capacitor group C1-C24, the thyristor T1-T6 and the circuits for triggering thereof of reverse parallel connection, reactor L1-L3; Bypass mechanical switch QF; Voltage transformer TV1-TV2, by-pass switch current transformer ACTA1, capacitance current instrument transformer ACTA2; DC current transformer DCTA, discharging gap FD and monitoring and protection unit etc.
Device has three kinds of operating states, promptly direct ground state, capacity earth state and protection operating state.
Direct ground state: by-pass switch QF is closed, and T1-T6 breaks off, and capacitor is by bypass, the direct ground connection of transformer neutral point.
The capacity earth state: by-pass switch QF breaks off, and T1-T6 breaks off, and transformer neutral point is through capacitor grounding, and device plays the effect that suppresses constant current.
Protection operating state: T1-T6 forces conducting, and QF is closed, and capacitor is by bypass, the direct ground connection of transformer neutral point.
Claims (2)
1. a transformer DC magnetic bias restraining device is characterized in that, it comprises the capacitor of one group of parallel connection, and a parallel connected end of capacitor group is connected with capacitance current instrument transformer ACTA2; Capacitance current instrument transformer ACTA2 is connected with DC current transformer DCTA, the by-pass switch current transformer ACTA1 of series connection;
Be parallel with voltage transformer TV1, TV2, discharging gap FD, bypass mechanical switch QF between by-pass switch current transformer ACTA1 and another parallel connected end of capacitor group, simultaneously bypass mechanical switch QF two ends also are parallel with reactor L1-L3 and the thyristor T1-T6 and the circuits for triggering thereof of the reverse parallel connection of connecting respectively with reactor L1-L3;
DC current transformer DCTA, by-pass switch current transformer ACTA1, voltage transformer TV1, TV2, thyristor T1-T6 circuits for triggering also are connected with the monitoring and protection unit.
2. transformer DC magnetic bias restraining device as claimed in claim 1; It is characterized in that; Said DC current transformer DCTA is connected with transformer neutral point earthed switch K1 one end; Parallel connected end of capacitor group is connected with transformer neutral point earthed switch K1 through device switching knife switch K2, and transformer neutral point earthed switch K1 is connected with transformer 220KV side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305315 CN202616762U (en) | 2012-06-27 | 2012-06-27 | Direct current magnetic bias restraining device of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305315 CN202616762U (en) | 2012-06-27 | 2012-06-27 | Direct current magnetic bias restraining device of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616762U true CN202616762U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220305315 Expired - Fee Related CN202616762U (en) | 2012-06-27 | 2012-06-27 | Direct current magnetic bias restraining device of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202616762U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709895A (en) * | 2012-06-27 | 2012-10-03 | 山东电力集团公司电力科学研究院 | Transformer DC (Direct Current) bias magnetic suppression device |
| CN103368168A (en) * | 2013-07-24 | 2013-10-23 | 国家电网公司 | Automatic switching transformer direct-current magnetic bias inhibiting device and control method thereof |
| 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 |
| CN105490259A (en) * | 2016-01-20 | 2016-04-13 | 桂林电力电容器有限责任公司 | Transformer neutral point capacitive DC blocking device |
-
2012
- 2012-06-27 CN CN 201220305315 patent/CN202616762U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709895A (en) * | 2012-06-27 | 2012-10-03 | 山东电力集团公司电力科学研究院 | Transformer DC (Direct Current) bias magnetic suppression device |
| CN103368168A (en) * | 2013-07-24 | 2013-10-23 | 国家电网公司 | Automatic switching transformer direct-current magnetic bias inhibiting device and control method thereof |
| CN103368168B (en) * | 2013-07-24 | 2016-08-10 | 国家电网公司 | The transformer DC magnetic bias restraining device of automatic switching and control method thereof |
| 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 |
| CN105490259A (en) * | 2016-01-20 | 2016-04-13 | 桂林电力电容器有限责任公司 | Transformer neutral point capacitive DC blocking device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20180627 |
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| CF01 | Termination of patent right due to non-payment of annual fee |