CN203826938U - Continuous chemical industry power supply anti-voltage-sage system - Google Patents
Continuous chemical industry power supply anti-voltage-sage system Download PDFInfo
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- CN203826938U CN203826938U CN201420197567.8U CN201420197567U CN203826938U CN 203826938 U CN203826938 U CN 203826938U CN 201420197567 U CN201420197567 U CN 201420197567U CN 203826938 U CN203826938 U CN 203826938U
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- 239000000126 substance Substances 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 17
- 230000035939 shock Effects 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model discloses a continuous chemical industry power supply anti-voltage-sage system. The system comprises a three-phase quick circuit-break switching device arranged in a medium voltage power grid, a two-phase quick circuit-break switching device arranged in a low voltage power grid, and a bus residual voltage retaining device, wherein the three-phase quick circuit-break switching device includes a diverter switch K1, a diverter switch K2, a diverter switch K3, a controller C1 and a controller C2; and the two-phase quick circuit-break switching device includes a diverter switch K4, a diverter switch K5, a controller C3 and a controller C4. The beneficial effects of the utility model are that: by means of the three-phase quick circuit-break switching device and the two-phase quick circuit-break switching device, a short-circuit fault point can be switched off within 20 milliseconds, and the bus residual voltage retaining device performs control on the upper and lower ends of the fault point, so that the fault point is isolated from the system, the voltage sag time is shortened, the halting accidents are prevented, and the safety of the system is improved.
Description
Technical field
The utility model relates to a kind of continuity chemical enterprise power supply voltage shock avoiding system, belongs to power network line resist technology field.
Background technology
The electricity that shakes is during electric power system occurs to the low voltage power supply of excision from short trouble, conventionally be referred to as " voltage sag ", in real process, the time of voltage sag is oversize, the limit of restraining oneself to low-voltage that has surpassed load, and depression time length is to cause too slowly owing to being responsible for the responsiveness of the circuit breaker of excision short trouble.Conventionally, generally shaking the electric time is 100 milliseconds of left and right, and exist the low-voltage of a lot of voltage-sensitive loads to restrain oneself limit time in system, only has 20 milliseconds of left and right, and in other words, the electricity that shakes exactly does not also finish, and stopping accident has just occurred.While there is to shake electricity, if operating load can successfully pass through this low-voltage operating mode, can not shut down, otherwise stopping production accident must occur.Why the electricity that shakes allows people pay attention to; that the enterprise having relatively high expectations for production technology continuity, is even more important because follow rolling electricity necessarily to have the generation of stopping accident; once the consequence causing of rolling electrification is very serious, the electric harm of therefore shaking is administered too impatient to wait.
In order not allow stopping accident occur; as long as we try every possible means shorten to shake the electric time, allow and shake electricity and just finish in advance in to low-voltage the frozen limit time in voltage-sensitive load, that is to say; in accident, before the contingent time, just finish rolling electricity, the certain just safety of system.
Summary of the invention
The purpose of this utility model is to provide a kind of continuity chemical enterprise power supply voltage shock avoiding system, overcomes the deficiencies in the prior art, can shorten and shake the electricity time, avoids the generation of stopping accident, improves the fail safe of system.
The purpose of this utility model is achieved through the following technical solutions: a kind of continuity chemical enterprise power supply voltage shock avoiding system, it is characterized in that: it is by being arranged on three-phase in the medium voltage network switching device shifter of quicking break, be arranged on that two-phase in low voltage electric network is quick break switching device shifter and the bus residual voltage holding device that is arranged on medium voltage network branch road forms, wherein, the three-phase switching device shifter of quicking break comprises diverter switch K1, diverter switch K2, diverter switch K3, controller C1 and controller C2, diverter switch K3 is arranged on middle pressure bus, diverter switch K1, diverter switch K2 is separately positioned on on two branch roads of pressing bus to be connected in diverter switch K3 place, the input of controller C1 is connected with diverter switch K1 place branch road, the output of controller C1 is connected with diverter switch K3 with diverter switch K1 respectively, the input of controller C2 is connected with diverter switch K2 place branch road, the output of controller C2 is connected with diverter switch K3 with diverter switch K2 respectively, the two-phase switching device shifter of quicking break comprises diverter switch K4, diverter switch K5, controller C3 and controller C4, diverter switch K4, diverter switch K5 is separately positioned on two branch roads of low voltage electric network, the input of controller C3 is connected with diverter switch K4 place branch road, the output of controller C3 is connected with the low-voltage bus bar connected with diverter switch K4 place branch road with diverter switch K4 respectively, the input of controller C4 is connected with diverter switch K5 place branch road, the output of controller C4 is connected with the low-voltage bus bar connected with diverter switch K5 place branch road with diverter switch K5 respectively.
Described three-phase the quick break quantity of switching device shifter and bus residual voltage holding device of switching device shifter, two-phase of quicking break is at least one.
Described controller C1, controller C2, controller C3 and controller C4 are all connected by the voltage transformer CT summation current transformer PT branch road corresponding with it, wherein, and in voltage transformer CT series connection access leg, in current transformer PT access leg in parallel.
Described bus residual voltage holding device comprises converter ZK, be connected in parallel on the current limliting branch road at converter ZK two ends, be connected to the Rogowski coil LK on medium voltage network bus branch road, the measurement and control unit being connected with Rogowski coil LK, the computer integrated protection being connected with measurement and control unit and the voltage transformer CT being connected with computer integrated protection, wherein, measurement and control unit is connected by two outputs with computer integrated protection, the output that converter ZK is connected with computer integrated protection with measurement and control unit respectively, voltage transformer CT and Rogowski coil LK are connected, current limliting props up route current-limiting impedance Z and disconnecting switch ZJ is in series, another output that measurement and control unit is connected with computer integrated protection is connected between current-limiting impedance Z and disconnecting switch ZJ.
The beneficial effects of the utility model are: utilize three-phase switching device shifter and the two-phase switching device shifter of quicking break of quicking break in 20 milliseconds, to excise short circuit trouble point; the means of simultaneously utilizing bus residual voltage holding device to adopt upper and lower two to administer to fault point; fault point " can be isolated away " from system; shortened and shaken the electricity time; avoid the generation of stopping accident, improved the fail safe of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the quick break structural representation of switching device shifter of the utility model three-phase;
Fig. 3 is the quick break structural representation of switching device shifter of the utility model two-phase;
Fig. 4 is the structural representation of the utility model bus residual voltage holding device.
Embodiment
Below in conjunction with accompanying drawing, further describe the technical solution of the utility model, but described in claimed scope is not limited to.
As Fig. 1, a kind of continuity chemical enterprise power supply voltage shock avoiding system, it is characterized in that: it is by being arranged on three-phase in the medium voltage network switching device shifter of quicking break, be arranged on that two-phase in low voltage electric network is quick break switching device shifter and the bus residual voltage holding device that is arranged on medium voltage network branch road forms, wherein, as Fig. 2, the three-phase switching device shifter of quicking break comprises diverter switch K1, diverter switch K2, diverter switch K3, controller C1 and controller C2, diverter switch K3 is arranged on middle pressure bus, diverter switch K1, diverter switch K2 is separately positioned on on two branch roads of pressing bus to be connected in diverter switch K3 place, the input of controller C1 is connected with diverter switch K1 place branch road, the output of controller C1 is connected with diverter switch K3 with diverter switch K1 respectively, the input of controller C2 is connected with diverter switch K2 place branch road, the output of controller C2 is connected with diverter switch K3 with diverter switch K2 respectively, as Fig. 3, the two-phase switching device shifter of quicking break comprises diverter switch K4, diverter switch K5, controller C3 and controller C4, diverter switch K4, diverter switch K5 is separately positioned on two branch roads of low voltage electric network, the input of controller C3 is connected with diverter switch K4 place branch road, the output of controller C3 is connected with the low-voltage bus bar connected with diverter switch K4 place branch road with diverter switch K4 respectively, the input of controller C4 is connected with diverter switch K5 place branch road, the output of controller C4 is connected with the low-voltage bus bar connected with diverter switch K5 place branch road with diverter switch K5 respectively.
Described three-phase the quick break quantity of switching device shifter and bus residual voltage holding device of switching device shifter, two-phase of quicking break is at least one.
Described controller C1, controller C2, controller C3 and controller C4 are all connected by the voltage transformer CT summation current transformer PT branch road corresponding with it, wherein, and in voltage transformer CT series connection access leg, in current transformer PT access leg in parallel.
Controller can be able to send actuating signal within working power system is short-circuited the 2ms of fault or dead electricity, realize the automatic switchover of circuit power, for example: outer net 1 occurs to shake electric, Intranet lower voltage, when being greater than rated value and being less than the short-circuit current value that transformer TI provides by K1 electric current, controller 1 calculates a judgement switching command by gathering the information of PT and CT; At K2 K1 separating brake, K3 in closing position situation, close a floodgate.In like manner the fault in other loops occurs, meets the supply of line power by similar switching.Controller, by the analysis to system power, change in voltage feature, can judge system failure type, thereby take corresponding Switching Strategy.As long as controller and to install accordingly computational speed fast, is active in one's movements, can in rising 2ms, short circuit current complete the calculating to short circuit current, busbar voltage, and failure judgement goes out to intranet and extranet short circuit and voltage sag, and sends actuating signal.Branch road to motor, controller sends sub-gate signal and switching signal immediately, at the zero crossing cutting-off of short-circuit electric current of first cycle, completes and sensitive loads is cut and is switched to from short circuit system the operation of stand-by power supply in 30ms.For the branch road of frequency converter, because system voltage drops to lower than capacitor of frequency converter voltage, input current is zero, and switch can complete in 15ms cuts frequency converter be switched to the operation on stand-by power supply from short circuit system.
As Fig. 4, described bus residual voltage holding device comprises converter ZK, be connected in parallel on the current limliting branch road at converter ZK two ends, be connected to the Rogowski coil LK on medium voltage network bus branch road, the measurement and control unit being connected with Rogowski coil LK, the computer integrated protection being connected with measurement and control unit and the voltage transformer CT being connected with computer integrated protection, wherein, measurement and control unit is connected by two outputs with computer integrated protection, the output that converter ZK is connected with computer integrated protection with measurement and control unit respectively, voltage transformer CT and Rogowski coil LK are connected, current limliting props up route current-limiting impedance Z and disconnecting switch ZJ is in series, another output that measurement and control unit is connected with computer integrated protection is connected between current-limiting impedance Z and disconnecting switch ZJ.While being short-circuited fault, when short circuit current is greater than set point, high-speed dsp in measurement and control unit draws the effective value of three-phase current in 1 to 2 millisecond by accurate measure, and send actuating signal, converter ZK is quick-speed turning on-off in 2 to 3 milliseconds, the short circuit current change of current enters in current-limiting impedance Z, limiting short-circuit current, the amplitude of short circuit current reduces greatly, visible device can be in equipment be short-circuited 6 to 16 milliseconds of faults, bus residual voltage is remained on to the more than 95% of rated voltage, guaranteed the normal work of other fault-free branch road sensitive loads.Simultaneously the suffered short circuit current of equipment such as main transformer reduces greatly, after the fault point excision in branch road, gives immediately converter ZK order when measurement and control unit detection branch electric current approaches rated current, and current-limiting impedance Z exits in 10 milliseconds, and recovery system moves.The branch road of the fault that is short-circuited is being short-circuited over 300 milliseconds, and fault is not removed, and this device detecting unit is thought the branch circuit breaker tripping of fault or the busbar fault of branch road, sends separating brake instruction to immediately disconnecting switch ZJ, cuts off this branch road; Except above-mentioned functions, device also comprises the repertoires such as Microcomputer Protection, relaying protection, logout, communication interface, branch current detection.That is to say, bus residual voltage holding device can be made accurate judgement according to the difference of fault point, guarantees that the power supply of non-fault branch load is supplied with.
Generally, the existence of short trouble can have influence on the voltage of top bus, thereby directly have influence on the normal production of other branch roads, therefore first to consider fault point and bus isolation, this will use three-phase switching device shifter and the two-phase switching device shifter of quicking break of quicking break, when occurring, fault rapidly fault is given to excision, secondly as very important in the branch road institute bringing onto load breaking down, in situation, can not have a power failure in critical condition, just need to give in this case these load access stand-by power supplies, the means of simultaneously utilizing bus residual voltage holding device to adopt upper and lower two to administer to fault point, fault point " can be isolated away " from system, this just ensures the protection logic to all based model for load duration power supplies, again in conjunction with the above-mentioned material time index that is less than 20 milliseconds, just form a complete rolling electricity and administered strategy.
Claims (4)
1. continuity chemical enterprise power supply voltage shock avoiding system, it is characterized in that: it is by being arranged on three-phase in the medium voltage network switching device shifter of quicking break, be arranged on that two-phase in low voltage electric network is quick break switching device shifter and the bus residual voltage holding device that is arranged on medium voltage network branch road forms, wherein, the three-phase switching device shifter of quicking break comprises diverter switch K1, diverter switch K2, diverter switch K3, controller C1 and controller C2, diverter switch K3 is arranged on middle pressure bus, diverter switch K1, diverter switch K2 is separately positioned on on two branch roads of pressing bus to be connected in diverter switch K3 place, the input of controller C1 is connected with diverter switch K1 place branch road, the output of controller C1 is connected with diverter switch K3 with diverter switch K1 respectively, the input of controller C2 is connected with diverter switch K2 place branch road, the output of controller C2 is connected with diverter switch K3 with diverter switch K2 respectively, the two-phase switching device shifter of quicking break comprises diverter switch K4, diverter switch K5, controller C3 and controller C4, diverter switch K4, diverter switch K5 is separately positioned on two branch roads of low voltage electric network, the input of controller C3 is connected with diverter switch K4 place branch road, the output of controller C3 is connected with the low-voltage bus bar connected with diverter switch K4 place branch road with diverter switch K4 respectively, the input of controller C4 is connected with diverter switch K5 place branch road, the output of controller C4 is connected with the low-voltage bus bar connected with diverter switch K5 place branch road with diverter switch K5 respectively.
2. continuity chemical enterprise according to claim 1 power supply voltage shock avoiding system, is characterized in that: described three-phase the quick break quantity of switching device shifter and bus residual voltage holding device of switching device shifter, two-phase of quicking break is at least one.
3. continuity chemical enterprise according to claim 1 power supply voltage shock avoiding system, it is characterized in that: described controller C1, controller C2, controller C3 and controller C4 are all connected by the voltage transformer CT summation current transformer PT branch road corresponding with it, wherein, in voltage transformer CT series connection access leg, in current transformer PT access leg in parallel.
4. continuity chemical enterprise according to claim 1 and 2 power supply voltage shock avoiding system, it is characterized in that: described bus residual voltage holding device comprises converter ZK, be connected in parallel on the current limliting branch road at converter ZK two ends, be connected to the Rogowski coil LK on medium voltage network bus branch road, the measurement and control unit being connected with Rogowski coil LK, the computer integrated protection being connected with measurement and control unit and the voltage transformer CT being connected with computer integrated protection, wherein, measurement and control unit is connected by two outputs with computer integrated protection, the output that converter ZK is connected with computer integrated protection with measurement and control unit respectively, voltage transformer CT and Rogowski coil LK are connected, current limliting props up route current-limiting impedance Z and disconnecting switch ZJ is in series, another output that measurement and control unit is connected with computer integrated protection is connected between current-limiting impedance Z and disconnecting switch ZJ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420197567.8U CN203826938U (en) | 2014-04-22 | 2014-04-22 | Continuous chemical industry power supply anti-voltage-sage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420197567.8U CN203826938U (en) | 2014-04-22 | 2014-04-22 | Continuous chemical industry power supply anti-voltage-sage system |
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| CN203826938U true CN203826938U (en) | 2014-09-10 |
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| CN201420197567.8U Expired - Lifetime CN203826938U (en) | 2014-04-22 | 2014-04-22 | Continuous chemical industry power supply anti-voltage-sage system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300231A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current-limiting method |
| CN107147208A (en) * | 2017-06-19 | 2017-09-08 | 珠海泰坦科技股份有限公司 | Applied to the active rapid switching device for shaking electric protection |
| CN116154948A (en) * | 2023-04-17 | 2023-05-23 | 安徽凯民电力技术有限公司 | Anti-interference electricity fast switching system of medium-voltage system |
-
2014
- 2014-04-22 CN CN201420197567.8U patent/CN203826938U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300231A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current-limiting method |
| CN107147208A (en) * | 2017-06-19 | 2017-09-08 | 珠海泰坦科技股份有限公司 | Applied to the active rapid switching device for shaking electric protection |
| CN116154948A (en) * | 2023-04-17 | 2023-05-23 | 安徽凯民电力技术有限公司 | Anti-interference electricity fast switching system of medium-voltage system |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20140910 |