CN112952749A - Protection system of series reactor - Google Patents
Protection system of series reactor Download PDFInfo
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- CN112952749A CN112952749A CN202110315865.7A CN202110315865A CN112952749A CN 112952749 A CN112952749 A CN 112952749A CN 202110315865 A CN202110315865 A CN 202110315865A CN 112952749 A CN112952749 A CN 112952749A
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- reactor
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- 239000003990 capacitor Substances 0.000 claims description 22
- 238000004804 winding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a protection system of a series reactor. It includes the condenser, the reactor, discharge coil, the arrester, isolator and ground connection switch, discharge coil and condenser are parallelly connected, the condenser is established ties with the reactor, the junction of condenser and reactor is arranged in to the arrester, isolator is connected with the reactor, the junction of isolator and reactor is arranged in to the one end of ground connection switch, the other end ground connection of ground connection switch, the reactor includes first reactor and second reactor, it has first current transformer to establish ties on the first reactor, it has second current transformer to establish ties on the second reactor, first reactor and first current transformer are connected the back and are connected parallelly connected with second reactor and second current transformer after connecting, first current transformer and second current transformer all are connected with the controller. The invention has the beneficial effects that: the method and the device realize effective detection of the turn-to-turn short circuit accident of the reactor, avoid the expansion of the accident and ensure the safe operation of the series reactor.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a protection system of a series reactor.
Background
At present, in a high-voltage reactive power compensation device, in order to suppress harmonic waves and limit switching-on inrush current, a reactor needs to be connected in series in a parallel capacitor, the reactor is important equipment in the reactive power compensation device, but the reactor is often found after the reactor is ignited due to accident enlargement when the reactor runs without protection for a long time, and in order to change the situation, special protection for arranging the reactor is provided in GB 50227-2008.
The special protection mode recommended by GB50227-2008 is as follows: (1) the oil immersed iron core is provided with gas protection; (2) the high-sensitivity smoke alarm arranged around the reactor has limited effect, and the safe operation of the reactor cannot be ensured; (3) voltage transformers are connected across two ends of the reactor, and terminal voltage protection is set, namely the reactive ratio is invalid when being less than 4.5%; the methods have obvious defects, and the turn-to-turn insulation breakdown phenomenon of the reactor cannot be detected in time due to the limited current detection and protection means. Therefore, in the existing reactive power compensation device, the series reactor is basically not provided with any protection, and huge potential safety hazards are brought to the safe operation of the series reactor.
Disclosure of Invention
The invention provides a protection system of a series reactor with high safety and reliability in order to overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a protection system of a series reactor comprises a capacitor, the reactor, a discharge coil, a lightning arrester, an isolating switch and a grounding disconnecting link, the discharge coil is connected with a capacitor in parallel, the capacitor is connected with a reactor in series, the lightning arrester is arranged at the connection part of the capacitor and the reactor, the isolating switch is connected with the reactor, one end of the grounding disconnecting link is arranged at the joint of the isolating switch and the reactor, the other end of the grounding disconnecting link is grounded, the reactor comprises a first reactor and a second reactor, a first current transformer is connected in series on the first reactor, a second current transformer is connected in series on the second reactor, the first reactor and the first current transformer are connected and then connected in parallel with the second reactor and the second current transformer, and the first current transformer and the second current transformer are both connected with a controller.
When the device is used, under the normal condition, the coil inductances in the first reactor and the second reactor are equal, so that the currents flowing through the two coils are also equal, but when one coil is subjected to turn-to-turn breakdown, the inductance change is obvious, and the inductance of the other coil is unchanged, so that the currents flowing through the two coils are obviously different, the current transformer transmits the measured current flowing through the two coils to the controller, the controller can process the measured data, and when the current exceeds a set value, the controller sends a signal to the upper-level circuit breaker to trip the capacitor complete device; the design realizes effective detection of the turn-to-turn short circuit accident of the reactor, realizes that a fault reactor loop is cut off at the first time under the unattended condition, avoids the expansion of the accident, can ensure the safe operation of the series reactor, and greatly improves the safety and reliability.
Preferably, the first reactor and the second reactor are both half-capacity reactors, the capacitor is respectively connected with one end of the first reactor and one end of the second reactor, the other end of the first reactor is connected with one end of a first current transformer, the other end of the second reactor is connected with one end of a second current transformer, the other end of the first current transformer and the other end of the second current transformer are connected and then connected with the isolating switch, and one end of the grounding disconnecting link is arranged at the joint of the other end of the first current transformer and the other end of the second current transformer.
As another preferred mode, the first reactor and the second reactor are connected in parallel to form a double-winding coil reactor, the double-winding coil reactor includes two coils, i.e., a first coil and a second coil, the capacitor is connected to one end of the first coil and one end of the second coil, the other end of the first coil is connected to one end of the first current transformer, the other end of the second coil is connected to one end of the second current transformer, the other end of the first current transformer and the other end of the second current transformer are connected and then connected to the isolating switch, and one end of the grounding disconnecting link is disposed at a connection position between the other end of the first current transformer and the other end of the second current transformer.
Preferably, the inductance deviation between the first reactor and the second reactor is in the range of-2%.
Preferably, a ratio of a current flowing through the first reactor to a current flowing through the second reactor is in a range of 0.96 to 1.04.
The invention has the beneficial effects that: the method and the device have the advantages that the turn-to-turn short circuit accident of the reactor can be effectively detected, the fault reactor loop can be cut off at the first time under the unattended condition, the accident is prevented from being enlarged, the safe operation of the series reactor can be ensured, and the safety and the reliability are greatly improved.
Drawings
FIG. 1 is a circuit schematic of the present invention;
figure 2 is a schematic circuit diagram of a double winding coil reactor.
In the figure: C. the device comprises a capacitor, TV. discharge coils, FV. lightning arresters, an L-shaped reactor, QE. grounding disconnecting link, QS. isolating switch, 1-first reactor, 2-second reactor, 3-first current transformer, 4-second current transformer and 5-controller.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In the embodiment shown in fig. 1, a protection system for a series reactor comprises a capacitor C, a reactor L, a discharge coil TV, the lightning arrester FV, a disconnecting switch QS and a grounding knife switch QE, a discharge coil TV is connected with a capacitor C in parallel, the capacitor C is connected with a reactor L in series, the lightning arrester FV is arranged at the joint of the capacitor C and the reactor L, the disconnecting switch QS is connected with the reactor L, one end of the grounding knife switch QE is arranged at the joint of the disconnecting switch QS and the reactor L, the other end of the grounding knife switch QE is grounded, the reactor L comprises a first reactor 1 and a second reactor 2, a first current transformer 3 is connected with the first reactor 1 in series, a second current transformer 4 is connected with the second reactor 2 and the second current transformer 4 in series, the first reactor 1 and the first current transformer 3 are connected with each other and then connected with each other in parallel, and the first current transformer 3 and the second current transformer 4 are both connected with a controller 5.
The first reactor 1 and the second reactor 2 are both half-capacity reactors L, the capacitor C is respectively connected with one end of the first reactor 1 and one end of the second reactor 2, the other end of the first reactor 1 is connected with one end of the first current transformer 3, the other end of the second reactor 2 is connected with one end of the second current transformer 4, the other end of the first current transformer 3 and the other end of the second current transformer 4 are connected with the isolating switch QS, and one end of the grounding knife switch QE is arranged at the joint of the other end of the first current transformer 3 and the other end of the second current transformer 4.
As shown in fig. 2, a first reactor 1 and a second reactor 2 are connected in parallel to form a double-winding coil reactor L, the double-winding coil reactor L includes two coils, i.e., a first coil and a second coil, a capacitor C is connected to one end of the first coil and one end of the second coil, respectively, the other end of the first coil is connected to one end of a first current transformer 3, the other end of the second coil is connected to one end of a second current transformer 4, the other end of the first current transformer 3 and the other end of the second current transformer 4 are connected to a disconnecting switch QS, and one end of a grounding knife-switch QE is disposed at a connection position between the other end of the first current transformer 3 and the other end of the second current transformer 4. Two current transformers are connected to the front ends of the a1 and a2 and used for extracting the current flowing through the coils a 1-a and a 2-a and transmitting the measurement result to the controller 5.
The deviation of the inductance between the first reactor 1 and the second reactor 2 is in the range of-2%. The ratio of the current flowing through the first reactor 1 to the current flowing through the second reactor 2 is in the range of 0.96-1.04.
In use, under normal conditions, the coil inductances in the first reactor 1 and the second reactor 2 are equal, so that the currents flowing through the two coils are also equal, namely: i1= I2, but when one of the coils experiences turn-to-turn breakdown, the inductance changes significantly, and the other coil does not change, so that the currents flowing through the two coils are significantly different, the current transformer transmits the measured magnitudes of the currents flowing through the two coils to the controller 5, the controller 5 processes the measured data, and when the currents I1/I2 exceed the set value, the controller 5 signals the upper-level circuit breaker to trip the capacitor C kit.
Claims (5)
1. A protection system of a series reactor is characterized by comprising a capacitor, a reactor, a discharge coil, a lightning arrester, a disconnecting switch and a grounding disconnecting link, wherein the discharge coil is connected with the capacitor in parallel, the capacitor is connected with the reactor in series, the lightning arrester is arranged at the joint of the capacitor and the reactor, the disconnecting switch is connected with the reactor, one end of the grounding disconnecting link is arranged at the joint of the disconnecting switch and the reactor, the other end of the grounding disconnecting link is grounded, the reactor comprises a first reactor (1) and a second reactor (2), a first current transformer (3) is connected on the first reactor (1) in series, a second current transformer (4) is connected on the second reactor (2) in series, the first reactor (1) and the first current transformer (3) are connected with the second reactor (2) and the second current transformer (4) and then connected in parallel, the first current transformer (3) and the second current transformer (4) are both connected with a controller (5).
2. The protection system of the series reactor as claimed in claim 1, wherein the first reactor (1) and the second reactor (2) are half-capacity reactors, the capacitor is respectively connected with one end of the first reactor (1) and one end of the second reactor (2), the other end of the first reactor (1) is connected with one end of a first current transformer (3), the other end of the second reactor (2) is connected with one end of a second current transformer (4), the other end of the first current transformer (3) and the other end of the second current transformer (4) are connected and then connected with an isolating switch, and one end of the grounding disconnecting link is arranged at the connection position of the other end of the first current transformer (3) and the other end of the second current transformer (4).
3. A protection system for a series reactor according to claim 1, characterized in that said first reactor (1) is connected in parallel with said second reactor (2) to form a double winding coil reactor, the double-winding coil reactor comprises two coils, namely a first coil and a second coil, the capacitor is respectively connected with one end of the first coil and one end of the second coil, the other end of the first coil is connected with one end of a first current transformer (3), the other end of the second coil is connected with one end of a second current transformer (4), the other end of the first current transformer (3) is connected with the other end of the second current transformer (4) and then is connected with the isolating switch, one end of the grounding disconnecting link is arranged at the joint of the other end of the first current transformer (3) and the other end of the second current transformer (4).
4. A protection system for a series reactor according to claim 1, 2 or 3, characterized in that the deviation in inductance between said first reactor (1) and said second reactor (2) is in the range-2%.
5. A protection system for a series reactor according to claim 1, 2 or 3, characterized in that the ratio of the current through the first reactor (1) to the current through the second reactor (2) is in the range of 0.96-1.04.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110315865.7A CN112952749A (en) | 2021-03-24 | 2021-03-24 | Protection system of series reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110315865.7A CN112952749A (en) | 2021-03-24 | 2021-03-24 | Protection system of series reactor |
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| Publication Number | Publication Date |
|---|---|
| CN112952749A true CN112952749A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110315865.7A Pending CN112952749A (en) | 2021-03-24 | 2021-03-24 | Protection system of series reactor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869333A (en) * | 1994-08-30 | 1996-03-12 | Matsushita Electric Ind Co Ltd | Stationary reactive power compensation device |
| CN201466733U (en) * | 2009-07-03 | 2010-05-12 | 上海追日电气有限公司 | Full-range on-load tap changing reactive power compensation device |
| JP2011199954A (en) * | 2010-03-17 | 2011-10-06 | Chugoku Electric Power Co Inc:The | Backup ground-fault protection device of reactor grounding power distribution system |
| CN203445620U (en) * | 2013-08-26 | 2014-02-19 | 上海坤友电气有限公司 | High-voltage reactive compensation wave-filtering device |
| CN204258314U (en) * | 2014-11-20 | 2015-04-08 | 苏州工业园区和顺电气股份有限公司 | For the high reliability switching circuit of the parallel power condenser reactive power compensator |
| CN108347035A (en) * | 2017-12-29 | 2018-07-31 | 陈聪 | A kind of device and method of monitoring reactor operating condition |
-
2021
- 2021-03-24 CN CN202110315865.7A patent/CN112952749A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869333A (en) * | 1994-08-30 | 1996-03-12 | Matsushita Electric Ind Co Ltd | Stationary reactive power compensation device |
| CN201466733U (en) * | 2009-07-03 | 2010-05-12 | 上海追日电气有限公司 | Full-range on-load tap changing reactive power compensation device |
| JP2011199954A (en) * | 2010-03-17 | 2011-10-06 | Chugoku Electric Power Co Inc:The | Backup ground-fault protection device of reactor grounding power distribution system |
| CN203445620U (en) * | 2013-08-26 | 2014-02-19 | 上海坤友电气有限公司 | High-voltage reactive compensation wave-filtering device |
| CN204258314U (en) * | 2014-11-20 | 2015-04-08 | 苏州工业园区和顺电气股份有限公司 | For the high reliability switching circuit of the parallel power condenser reactive power compensator |
| CN108347035A (en) * | 2017-12-29 | 2018-07-31 | 陈聪 | A kind of device and method of monitoring reactor operating condition |
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Application publication date: 20210611 |
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