CN203504513U - Auxiliary turn-off circuit for forcibly turning off thyristors - Google Patents
Auxiliary turn-off circuit for forcibly turning off thyristors Download PDFInfo
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- CN203504513U CN203504513U CN201320597556.4U CN201320597556U CN203504513U CN 203504513 U CN203504513 U CN 203504513U CN 201320597556 U CN201320597556 U CN 201320597556U CN 203504513 U CN203504513 U CN 203504513U
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- thyristor
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Abstract
Provided is an auxiliary turn-off circuit for forcibly turning off thyristors. The auxiliary turn-off circuit is connected with two ends of a main thyristor circuit in parallel, when a low voltage ride-through phenomenon is detected, the auxiliary turn-off circuit is turned on, all currents flow through the auxiliary turn-off circuit instantaneously, while no current flows through the main thyristor circuit, and the main thyristor is turned off rapidly; and after the main thyristor is turned off, the auxiliary turn-off circuit also needs to be turned off, and the resonant frequency of the auxiliary turn-off circuit is high, so that the rapid zero-crossing shutoff of the auxiliary thyristor is ensured, and low voltage ride-through equipment enters the low voltage ride-through state.
Description
Technical field
The utility model relates to a kind of circuit that is forced shutdown thyristor being applied on low-voltage crossing equipment.
Background technology
Without assisting the shutoff of the thyristor of breaking circuit, by electric current natural zero-crossing, turn-off, when thyristor flows through 50HZ sinusoidal wave, it is half period that the longest turn-off time can reach 10mS(), this long-time shutoff can make rear end machine directly enter low-voltage crossing and off-grid, therefore there will be the possibility of low-voltage crossing failure.
Utility model content
The purpose of this utility model is to provide and the turn-off time of thyristor can be controlled in 3mS, thereby makes low-voltage crossing equipment enter faster low-voltage crossing, and assurance rear end current transformer can not shut down because of low wearing.
The technical solution of the utility model: a kind of auxiliary breaking circuit that is forced shutdown thyristor, described auxiliary breaking circuit comprises transformer, resistance, diode, auxiliary electric capacity, main thyristor circuit, the first inductance and the second inductance of turn-offing, and described transformer, resistance, diode, the auxiliary capacitance series that turn-offs become the first loop; Described main thyristor circuit is to be formed in parallel by the 5th thyristor and the 6th thyristor, described auxiliary breaking circuit also comprises auxiliary triode thyristor circuit, described auxiliary triode thyristor circuit comprises the first thyristor, the second thyristor, the 3rd thyristor, the 4th thyristor, the first described thyristor and the second Thyristors in series; The 3rd described thyristor and the 4th Thyristors in series; In parallel between first, second described thyristor and the 3rd, the 4th thyristor; Described auxiliary shutoff electric capacity, the first inductance, the third and fourth thyristor, the second inductance series connection; Node between the 3rd, the 4th described thyristor is connected with main thyristor circuit one end; Node between first, second described thyristor is connected with the other end of main thyristor circuit.
Advantage of the present utility model: the two ends of main thyristor circuit a upper auxiliary breaking circuit, when low-voltage crossing being detected, auxiliary breaking circuit is open-minded, and all electric current transient flows are crossed auxiliary breaking circuit, and the electric current that flows through main thyristor circuit is zero, main thyristor turn-offs rapidly; Main thyristor closes has no progeny, and auxiliary breaking circuit also needs to turn-off, and the resonance frequency of auxiliary breaking circuit is very high, and this just guarantees auxiliary triode thyristor zero-crossing switching rapidly, and low-voltage crossing equipment enters low wearing.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present utility model.
Embodiment
A kind of auxiliary breaking circuit that is forced shutdown thyristor as shown in Figure 1, described auxiliary breaking circuit comprises transformer T, resistance R, diode D, auxiliary capacitor C, main thyristor circuit, the first inductance L 1 and the second inductance L 2 of turn-offing, and described transformer T, resistance R, diode D, the auxiliary capacitor C of turn-offing are concatenated into the first loop; Described main thyristor circuit is to be formed in parallel by the 5th thyristor VT5 and the 6th thyristor VT6, described auxiliary breaking circuit also comprises auxiliary triode thyristor circuit, described auxiliary triode thyristor circuit comprises the first thyristor VT1, the second thyristor VT2, the 3rd thyristor VT3, the 4th thyristor VT4, the first described thyristor VT1 and the second thyristor VT2 series connection; The 3rd described thyristor VT3 and the 4th thyristor VT4 series connection; In parallel between first, second described thyristor and the 3rd, the 4th thyristor; Described auxiliary shutoff electric capacity, the first inductance, the third and fourth thyristor, the second inductance L 2 series connection; Node between the 3rd, the 4th described thyristor is connected with main thyristor circuit one end; Node between first, second described thyristor is connected with the other end of main thyristor circuit.
Operation principle: under normal circumstances, it is open-minded that the 5th thyristor VT5 and the 6th thyristor VT6 send out driving, electric energy flows to electrical network by the 5th thyristor VT5 and the 6th brilliant lock VT6, by-pass current is detected on backstage in real time, when low-voltage crossing is arrived in low-voltage crossing equipment Inspection, first be that main thyristor drive plate stops sending out ripple, suppose now the 5th thyristor VT5 conducting, the 6th thyristor VT6 can directly turn-off and can not open before main thyristor drive plate is sent out driving again, and the 5th thyristor VT5 can enter nature shutoff (the nature turn-off time is 0-10ms), simultaneously, backstage is according to the by-pass current direction detecting, judge the main thyristor (VT5) that needs shutoff, then open corresponding the 4th thyristor VT4 and the first thyristor VT1.After the 4th corresponding thyristor VT4 and the first thyristor VT1 open, the pressure drop meeting at the 5th thyristor VT5 two ends by its conduction voltage drop+the auxiliary electric capacity both end voltage of turn-offing of directly become-975V(of 1.5V), now, electric current can not flow to negative electrode through the anode of the 5th thyristor VT5, and can flow through from auxiliary capacitor, thereby makes to flow through the instantaneous zero passage of electric current of the 5th thyristor VT5, now, the 5th thyristor VT5 is without driving, and electric current is zero, instantaneous shutoff.Have no progeny in the 5th instantaneous pass of thyristor VT5, only need to turn-off after auxiliary the 4th thyristor VT4 and a VT1, can carry out low-voltage crossing, the driving time that auxiliary triode thyristor drive plate is sent out to auxiliary triode thyristor is hundreds of microsecond, after hundreds of microsecond, auxiliary triode thyristor drive plate stops sending out driving, auxiliary the 4th thyristor VT4 and the first thyristor VT1 enter nature and turn-off, but, the electric current that flows through auxiliary the 4th thyristor VT4 and a VT1 is not the sine wave of 50HZ, but high-frequency resonant electric current, therefore the nature turn-off time is very short, generally only has hundreds of microsecond to 2 millisecond.To sum up, the turn-off time of whole bypass is less than 3ms, much smaller than the longest 10ms naturally turn-offing.
After auxiliary shutoff completes, by transformer T, resistance R, diode D, auxiliaryly turn-off capacitor charging loop that capacitor C forms and can the auxiliary voltage that turn-offs capacitor C two ends be charged to the voltage before auxiliary charging circuit action, assist the normal work of breaking circuit when guaranteeing low-voltage crossing next time.
Claims (1)
1. an auxiliary breaking circuit that is forced shutdown thyristor, described auxiliary breaking circuit comprises transformer, resistance, diode, auxiliary electric capacity, main thyristor circuit, the first inductance and the second inductance of turn-offing, and described transformer, resistance, diode, the auxiliary capacitance series that turn-offs become the first loop; Described main thyristor circuit is to be formed in parallel by the 5th thyristor and the 6th thyristor, it is characterized in that described auxiliary breaking circuit also comprises auxiliary triode thyristor circuit, described auxiliary triode thyristor circuit comprises the first thyristor, the second thyristor, the 3rd thyristor, the 4th thyristor, the first described thyristor and the second Thyristors in series; The 3rd described thyristor and the 4th Thyristors in series; In parallel between first, second described thyristor and the 3rd, the 4th thyristor; Described auxiliary shutoff electric capacity, the first inductance, the third and fourth thyristor, the second inductance series connection; Node between the 3rd, the 4th described thyristor is connected with main thyristor circuit one end; Node between first, second described thyristor is connected with the other end of main thyristor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597556.4U CN203504513U (en) | 2013-09-27 | 2013-09-27 | Auxiliary turn-off circuit for forcibly turning off thyristors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597556.4U CN203504513U (en) | 2013-09-27 | 2013-09-27 | Auxiliary turn-off circuit for forcibly turning off thyristors |
Publications (1)
| Publication Number | Publication Date |
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| CN203504513U true CN203504513U (en) | 2014-03-26 |
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| CN201320597556.4U Expired - Fee Related CN203504513U (en) | 2013-09-27 | 2013-09-27 | Auxiliary turn-off circuit for forcibly turning off thyristors |
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| CN (1) | CN203504513U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196631A (en) * | 2017-05-16 | 2017-09-22 | 深圳市盛弘电气股份有限公司 | A kind of system and method for being forced shutdown IGCT |
| CN107196630A (en) * | 2017-05-16 | 2017-09-22 | 深圳市盛弘电气股份有限公司 | A kind of system and method for being forced shutdown IGCT |
| CN108923403A (en) * | 2018-09-27 | 2018-11-30 | 广东电网有限责任公司 | A kind of transformer neutral point blocking device, blocking system and its control method |
| CN112415356A (en) * | 2020-11-05 | 2021-02-26 | 阳光电源股份有限公司 | Thyristor turn-off characteristic testing device and testing method |
-
2013
- 2013-09-27 CN CN201320597556.4U patent/CN203504513U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196631A (en) * | 2017-05-16 | 2017-09-22 | 深圳市盛弘电气股份有限公司 | A kind of system and method for being forced shutdown IGCT |
| CN107196630A (en) * | 2017-05-16 | 2017-09-22 | 深圳市盛弘电气股份有限公司 | A kind of system and method for being forced shutdown IGCT |
| CN107196631B (en) * | 2017-05-16 | 2021-03-23 | 深圳市盛弘电气股份有限公司 | System and method for forcibly turning off thyristor |
| CN108923403A (en) * | 2018-09-27 | 2018-11-30 | 广东电网有限责任公司 | A kind of transformer neutral point blocking device, blocking system and its control method |
| CN112415356A (en) * | 2020-11-05 | 2021-02-26 | 阳光电源股份有限公司 | Thyristor turn-off characteristic testing device and testing method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20210927 |