CN105870897A - Inrush transient current suppression device based on three-phase-trip circuit breaker - Google Patents
Inrush transient current suppression device based on three-phase-trip circuit breaker Download PDFInfo
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- CN105870897A CN105870897A CN201610384883.XA CN201610384883A CN105870897A CN 105870897 A CN105870897 A CN 105870897A CN 201610384883 A CN201610384883 A CN 201610384883A CN 105870897 A CN105870897 A CN 105870897A
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- module
- outfan
- inrush
- phase
- transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Breakers (AREA)
Abstract
The invention relates to an inrush transient current suppression device based on a three-phase-trip circuit breaker. The suppression device is mainly used for suppressing inrush transient currents of a transformer when the transformer is charged after outage repair is conducted on the transformer. The suppression device comprises a zero-point detecting module, a delay module and an inrush drive module which are sequentially connected in series. The phase-A alternating voltages of a bus PT pass through the zero-point detecting module and are converted into rectangular wave signals with a sine wave zero point as the starting point, the rectangular wave signals pass through an inrush button, rise and trigger the delay module to be delayed and then trigger an MOSFET drive switch so that an inrush coil can be conducted, the circuit breaker at the high-voltage side of the transformer is subjected to inrush at the peak value of the phase-A voltages, and the transformer is charged. Thus, the inrush transient currents of the transformer are greatly reduced, and the aims of preventing a fixing piece from getting loose, suppressing the differential protection of the transformer and the like are achieved.
Description
Technical field
The present invention relates to a kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether, when transformator being charged after being mainly used in transformator interruption maintenance, suppress Transformer Close to shove.
Background technology
During Transformer Close charging, when primary side combined floodgate moment is exactly voltage zero-cross, owing to the magnetic flux phase place in transformer core falls behind voltage 90 degree, so now the magnetic flux in iron core be maximum, but magnetic flux can not suddenly change, so iron core can produce the direct current flux of the speed that decays in time in opposite direction to offset this maximum, after half period, this direct current flux is identical with exchange flux direction again, and the two is added, allow for core sataration, the biggest exiting pour current will be produced.The working specification of power system specifies: after overhaul or new on transformator need through five chargings of closing a floodgate; the repeat impact of big exciting current can cause the mechanical force between winding; may gradually make fixing loosening, inrush phenomenon may cause the differential protection action of transformator in addition.At present, the device of suppression inrush phenomenon mostly accurately controls the closing time of each phase of chopper by complicated Power Electronic Circuit, is generally used for three-phase separate and jumps chopper.And current major part transformer station, especially 220kV and the on high-tension side chopper of following main transformer of transformer substation be three-phase and jump chopper altogether, and former structure is complicated, cost is high, fault rate is high；The latter cannot suppress inrush phenomenon, easily causes the phenomenons such as loosening, the transformer differential protection of above-mentioned fixing piece.
Summary of the invention
It is an object of the invention to provide a kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether, reach to reduce the purpose that Transformer Close is shoved.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that:
A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether of the present invention, including
Zero point detection module, for detecting the zero crossing of sinusoidal voltage, the trailing edge of this square wave is also triggered signal as subsequent conditioning circuit by output 50Hz square wave；
Time delay module, for regulating the pulse width of zero point detection module output so that it is meet the combined floodgate requirement of chopper；
Close a floodgate and drive module, be used for driving chopper to complete feed motion,
Described zero point detection module includes being connected to the sinusoidal signal input that bus transformer A phase is held, the square-wave signal outfan being connected to sinusoidal signal input by photoelectrical coupler；The input of described time delay module is connected to square-wave signal outfan, and the outfan of time delay module is connected to close a floodgate and drives the input of module；Described combined floodgate drives module to be made up of field effect transistor and drive circuit thereof.
Described time delay module is made up of integrated circuit 74LS123 and the peripheral circuit of thtee-stage shiplock.
Described combined floodgate drives the drive circuit of field effect transistor in module by timing circuit and to drive module to constitute, and timing circuit is made up of integrated circuit NE555N2 and peripheral circuit thereof, and the end that triggers of integrated circuit NE555N2 connects the outfan of time delay module；The outfan of integrated circuit NE555N2 is connected to drive the input of module, described driving module uses integrated circuit M57962, the input of described integrated circuit M57962 is connected to the outfan of timing circuit, the outfan of integrated circuit M57962 is connected to the grid of field effect transistor, and described field effect transistor uses MOSFET.
Closing a floodgate, the outfan driving module is provided with chopper.
The square-wave signal outfan of described zero point detection module is in series with inrush current prevention operating handle SB0；Closing a floodgate, the outfan driving module is provided with mode selection switch.
After using technique scheme; the control to breaker closing phase place is realized by this device; it is determined by voltage over zero; through certain delays time to control measure; just at the peak value of A phase voltage when making Transformer Close charge; thus be greatly reduced Transformer Close and shove, reach to prevent fixture from loosening, contain the purpose of the phenomenons such as transformer differential protection.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the zero point detection module of one embodiment of the invention.
Fig. 2 is the circuit diagram of time delay module.
Fig. 3 is the circuit diagram closing a floodgate and driving module.
Fig. 4 is the operation principle sequential chart of one embodiment of the invention.
It is embodied as
A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether of the present invention, including
Zero point detection module, for detecting the zero crossing of sinusoidal voltage, the trailing edge of this square wave is also triggered signal as subsequent conditioning circuit by output 50Hz square wave；
Time delay module, for regulating the pulse width of zero point detection module output so that it is meet the combined floodgate requirement of chopper；
Close a floodgate and drive module, be used for driving chopper to complete feed motion.
Described zero point detection module includes being connected to the sinusoidal signal input Vin that bus transformer A phase is held, the square-wave signal output end vo being connected to sinusoidal signal input Vin by photoelectrical coupler；The input of described time delay module is connected to square-wave signal output end vo, and the outfan of time delay module is connected to close a floodgate and drives the input of module；Described combined floodgate drives module to be made up of field effect transistor T1 and drive circuit thereof.
As shown in Figure 1, the model of the core parts photoelectrical coupler of zero point detection module is NEC2501KK, and sine voltage signal input Vin takes from bus transformer secondary A phase voltage, and resistance R1 takes 7.5M Ω, another resistance R2 takes 220K Ω, and running voltage Vcc takes 12V DC voltage.
Zero point detection, for detecting the zero crossing of sinusoidal voltage, exports 50Hz square wave, uses the trailing edge triggering signal as subsequent conditioning circuit of square wave.After inrush current prevention operating handle SB0 connects, the trailing edge that zero passage detection obtains triggers signal and exports to time delay process.
As in figure 2 it is shown, described time delay module is made up of integrated circuit 74LS123 and the peripheral circuit of thtee-stage shiplock.This part has three integrated circuit 74LS123 to constitute, and integrated circuit 74LS123 output pulse width is to be determined by the capacitance resistance value of its pin 14 and 16.First is provided by square-wave signal output end vo and triggers signal, selects electric capacity C1 and resistance R3 to be respectively 0.1uF and 22k, the short pulse duration of output 50us.This pulsewidth goes to trigger second integrated circuit 74LS123, it is 4.7uF that this chip chooses electric capacity C2, it is adjustable by 0-20k Ω that adjustable resistance R4 can realize resistance, so output signal is the adjustable pulse of 0-28ms, a piece of integrated circuit 74LS123 under going to trigger with the trailing edge of this signal, make it export the short pulse duration of 50us, equally, select electric capacity C3 and resistance R5 to be respectively 0.1uF and 22k.
By regulating the pulse width of this link, closing coil can be controlled when turning in a sine wave period, so that just at the peak value (or valley) of A phase voltage during Transformer Close charging.This pulse width can be obtained when the inrush phenomenon minimum of A phase by test of repeatedly closing a floodgate, it is possible to by chopper, producer provides.Subpulse width once it is determined that, then from voltage over zero to Transformer Close charging time determine, then transformator every time close a floodgate charging all in the same moment of sinusoidal cycles.
As shown in Figure 3, described combined floodgate drives the drive circuit of field effect transistor T1 in module by timing circuit IC1 and to drive module IC2 to constitute, timing circuit IC1 is made up of integrated circuit NE555N2 and peripheral circuit thereof, and the triggering end Vin2 of integrated circuit NE555N2 connects the outfan of time delay module；The outfan of integrated circuit NE555N2 is connected to drive the input of module IC2, described driving module IC2 uses integrated circuit M57962, the input of described integrated circuit M57962 is connected to the outfan of timing circuit IC1, the outfan of integrated circuit M57962 is connected to the grid of field effect transistor T1, and described field effect transistor T1 uses MOSFET.
It addition, be provided with, at the outfan driving module that closes a floodgate, the chopper being controlled.
The square-wave signal output end vo of described zero point detection module is in series with inrush current prevention operating handle SB0；Closing a floodgate, the outfan driving module is provided with mode selection switch K.
The trailing edge triggering timing IC circuit 1 namely integrated circuit NE555N2 of the pulse signal that this link exports with the outfan of time delay module, the high level signal of output pulse width about 20ms, as the driving signal of field effect transistor T1.This signal pulsewidth can be controlled by adjustable resistance R6 and electric capacity C4, if this chopper is electromagnetic power formula, this signal pulsewidth should normally be closed a floodgate the conduction time required for time institute's closing coil not less than chopper, to ensure that chopper can normally close a floodgate.The pulsewidth of integrated circuit NE555N2 pin 3 output, after triggering the conducting of field effect transistor T1 by integrated circuit M57962 chip, closing coil LC turns on, breaker closing.By mode selection switch K selectable modes 1 and pattern 2, pattern 1 puts into when transformator is properly functioning, and pattern 2 puts into when transformator charges.After pattern 2 times, five-prevention operation switch SB1 conducting, then pressing switch SB0, can allow the trailing edge Time delay circuit of zero point detection signal, and then trigger the conducting of field effect transistor T1, closing coil LC turns on, and Transformer Close is charged.
In Fig. 3, it is 0-20k Ω that capacitor C4 is fixed as 0.2uF, resistance R6, can coordinate the pulsewidth of output 0-70ms.Vcc be 15V, Vee be 10V, capacitor C4 and capacitor C5 is 47uF,
Auxiliary contacts of circuit breaker QF disconnects after breaker closing automatically.
As shown in Figure 4, control principle is as follows: sinusoidal ac signal L1 takes from bus transformer secondary side A phase voltage, A cross streams voltage is through zero-crossing examination module, become square-wave signal L2 with sine-way zero as starting point, after square-wave signal is by rising edge Time delay module after switch knob, after time delay, time delayed signal L4 forms switching signal L3, trigger field effect transistor T1 and drive switch, field effect transistor T1 turns on, forming closing coil signal L5, then closing coil LC conducting, high voltage side of transformer chopper closes a floodgate at the peak value of A phase voltage, transformator charging.Wherein the size of delay time t should match with the model using chopper.
Claims (5)
1. an inrush phenomenon restraining device for chopper is jumped altogether based on three-phase, including
Zero point detection module, for detecting the zero crossing of sinusoidal voltage, the trailing edge of this square wave is also triggered signal as subsequent conditioning circuit by output 50Hz square wave；
Time delay module, for regulating the pulse width of zero point detection module output so that it is meet the combined floodgate requirement of chopper；
Close a floodgate and drive module, be used for driving chopper to complete feed motion,
It is characterized in that: described zero point detection module includes being connected to the sinusoidal signal input (Vin) that bus transformer A phase is held, the square-wave signal outfan (Vo) being connected to sinusoidal signal input (Vin) by photoelectrical coupler；The input of described time delay module is connected to square-wave signal outfan (Vo), and the outfan of time delay module is connected to close a floodgate and drives the input of module；Described combined floodgate drives module to be made up of field effect transistor (T1) and drive circuit thereof.
A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether the most according to claim 1, it is characterised in that: described time delay module is made up of integrated circuit 74LS123 and the peripheral circuit of thtee-stage shiplock.
A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether the most according to claim 1, it is characterized in that: described combined floodgate drives the drive circuit of field effect transistor (T1) in module by timing circuit (IC1) and to drive module (IC2) to constitute, timing circuit (IC1) is made up of integrated circuit NE555N2 and peripheral circuit thereof, and the triggering end (Vin2) of integrated circuit NE555N2 connects the outfan of time delay module；The outfan of integrated circuit NE555N2 is connected to drive the input of module (IC2), described driving module (IC2) uses integrated circuit M57962, the input of described integrated circuit M57962 is connected to the outfan of timing circuit (IC1), the outfan of integrated circuit M57962 is connected to the grid of field effect transistor (T1), and described field effect transistor (T1) uses MOSFET.
4. according to a kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether described in claim 1 or 2 or 3, it is characterised in that: closing a floodgate, the outfan driving module is provided with chopper.
5. according to a kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether described in claim 1 or 2 or 3, it is characterised in that: the square-wave signal outfan (Vo) of described zero point detection module is in series with inrush current prevention operating handle SB0；Closing a floodgate, the outfan driving module is provided with mode selection switch (K).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610384883.XA CN105870897B (en) | 2016-06-02 | 2016-06-02 | A kind of inrush phenomenon restraining device for jumping breaker altogether based on three-phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610384883.XA CN105870897B (en) | 2016-06-02 | 2016-06-02 | A kind of inrush phenomenon restraining device for jumping breaker altogether based on three-phase |
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| Publication Number | Publication Date |
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| CN105870897A true CN105870897A (en) | 2016-08-17 |
| CN105870897B CN105870897B (en) | 2018-04-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558482A (en) * | 2004-01-15 | 2004-12-29 | 叶念国 | Static exciter inrush current inhibition method and apparatus |
| WO2011116488A1 (en) * | 2010-03-22 | 2011-09-29 | Siemens Aktiengesellschaft | Method and apparatus for suppressing an inrush current of a trans former |
| CN204167890U (en) * | 2014-11-05 | 2015-02-18 | 国家电网公司 | A kind of single-phase transformer inrush current suppression apparatus |
| CN105140885A (en) * | 2015-08-18 | 2015-12-09 | 淮沪电力有限公司 | Exciting surge suppression device of main transformer |
| CN205753381U (en) * | 2016-06-02 | 2016-11-30 | 国网山东省电力公司莱芜供电公司 | A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether |
-
2016
- 2016-06-02 CN CN201610384883.XA patent/CN105870897B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558482A (en) * | 2004-01-15 | 2004-12-29 | 叶念国 | Static exciter inrush current inhibition method and apparatus |
| WO2011116488A1 (en) * | 2010-03-22 | 2011-09-29 | Siemens Aktiengesellschaft | Method and apparatus for suppressing an inrush current of a trans former |
| CN204167890U (en) * | 2014-11-05 | 2015-02-18 | 国家电网公司 | A kind of single-phase transformer inrush current suppression apparatus |
| CN105140885A (en) * | 2015-08-18 | 2015-12-09 | 淮沪电力有限公司 | Exciting surge suppression device of main transformer |
| CN205753381U (en) * | 2016-06-02 | 2016-11-30 | 国网山东省电力公司莱芜供电公司 | A kind of inrush phenomenon restraining device jumping chopper based on three-phase altogether |
Non-Patent Citations (1)
| Title |
|---|
| 魏旭等: "真空断路器投入并联电容器的过电压分析及防护", 《高电压技术》 * |
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| CN105870897B (en) | 2018-04-10 |
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