CN101630916B - Transformer on-load voltage regulating device and method therefor - Google Patents
Transformer on-load voltage regulating device and method therefor Download PDFInfo
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- CN101630916B CN101630916B CN2009100885790A CN200910088579A CN101630916B CN 101630916 B CN101630916 B CN 101630916B CN 2009100885790 A CN2009100885790 A CN 2009100885790A CN 200910088579 A CN200910088579 A CN 200910088579A CN 101630916 B CN101630916 B CN 101630916B
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Abstract
The invention discloses a transformer on-load voltage regulating device and a method thereof, belonging to the field of a transformer in an electrical power system. The device comprises at least two stages of voltage switching sub-circuits, wherein each stage of voltage switching sub-circuit is electrically connected with a transformer winding, and the voltage switching sub-circuits are connected with each other in parallel; each stage of voltage switching sub-circuit comprises a first switch module used for controlling on and off of the voltage switching sub-circuit where the first switch module is positioned, a current zero-crossing switching module which is connected with the first switch module in parallel and used for controlling on and off of the voltage switching sub-circuit where the current zero-crossing switching module is positioned under the action of control signals when the current of each stage of voltage switching sub-circuit exceeds zero. The transformer on-load voltage regulating device can switch by controlling the current zero-crossing switching module when the current of the voltage switching sub-circuit exceeds zero, thus eliminating voltaic arc generated in the switching process.
Description
Technical field
The present invention relates to the electric power system field transformer, particularly a kind of transformer on-load voltage regulating device and method.
Background technology
At present, the electric power system transformer on-load voltage regulating generally adopts mechanical on-load voltage regulating switch to realize, it mainly is made of tap selector or shunting switch, diverter switch, transition resistance three parts, basic principle is to draw some taps from the coil of a certain side of transformer, by on load tap changer, under the situation of not cutting off load current, by a tap-change operation to another tap, with the effective turn of conversion transformer coil, reach the purpose of regulation voltage.But along with the development of society and increasing rapidly of power consumption, scale of power constantly enlarges, electric network composition becomes increasingly complex, and this mechanical on-load voltage regulating switch can not satisfy the safety of modern power network and the requirement of economical operation fully.
In realizing process of the present invention, the inventor finds:
There is following problem in the pressure regulation method of machinery on-load voltage regulating switch: produce electric arc in the tap-change operation process, cause mechanical contact scaling loss and transformer insulation oil dielectric polarization; The responsiveness of mechanical switch is slow, and the pressure regulation response time is long, and the failure rate height, and maintenance is big; Have dispersiveness the operate time of mechanical switch, can't accurately control when making pressure regulation, and in the pressure regulation process because transient process may appear in the time-delay of mechanical switch, even wrong shelves, inconsistent phenomenon appear, the safe operation of electrical network is brought adverse influence.
Summary of the invention
For the pressure regulation process that makes transformer does not produce electric arc, the tap-change operation transient process is short, and the embodiment of the invention provides a kind of transformer on-load voltage regulating device and method.Described technical scheme is as follows:
A kind of transformer on-load voltage regulating device comprises Transformer Winding;
At least two step voltage handoff leg, every step voltage handoff leg all is electrically connected with described Transformer Winding,
In parallel between every step voltage handoff leg;
Every step voltage handoff leg comprises: first switch module is used to control the break-make of the voltage handoff leg at its place;
The current over-zero handover module, in parallel with described first switch module, be used under the effect of control signal, when the current over-zero of every step voltage handoff leg, control the break-make of the voltage handoff leg at described current over-zero handover module place;
Described every step voltage handoff leg also comprises: second switch module or the 3rd switch module; After described first switch module and the parallel connection of described current over-zero handover module, parallel branch is connected with described second switch module; Described the 3rd switch module is with after described current over-zero handover module is connected, and series arm is in parallel with described first switch module.
Described first switch module is magnetic latching relay, circuit breaker or contactor; Described second switch module is magnetic latching relay, circuit breaker or contactor.
Described first switch module is magnetic latching relay, circuit breaker or contactor; Described the 3rd switch module is magnetic latching relay, circuit breaker or contactor.
Described current over-zero handover module is a Group of Silicon Controlled Rectifier.
Described Group of Silicon Controlled Rectifier is two antiparallel one-way SCRs or a bidirectional triode thyristor.
A kind of transformer on-load voltage regulating method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal the described first order voltage of conducting handoff leg for the current over-zero handover module in the first order voltage handoff leg simultaneously;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level.
When described every step voltage handoff leg also comprises the second switch module, after described first switch module and the parallel connection of described current over-zero handover module, parallel branch is connected with described second switch module, and correspondingly, described method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, the described first order voltage of conducting handoff leg, and the second switch module in the voltage handoff leg of the connection second level;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level, and disconnect second switch module in the described first order voltage handoff leg.
When described every step voltage handoff leg also comprises the 3rd switch module, described the 3rd switch module is with after described current over-zero handover module is connected, and series arm is in parallel with described first switch module, and correspondingly, described method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, the described first order voltage of conducting handoff leg, and the 3rd switch module in the voltage handoff leg of the connection second level;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level, and disconnect the 3rd switch module in the described first order voltage handoff leg.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
By the current over-zero handover module under the effect of control signal, the break-make of control place voltage handoff leg when the current over-zero of every step voltage handoff leg, with the switch control module co-operating, realize when current over-zero, switching between the voltage handoff leg, therefore eliminated the electric arc that produces in the handoff procedure; Simultaneously, the current over-zero handover module is compared the mechanical switch quick action as power electronic device, and the response time is short, the accurate control when helping pressure regulation.
Description of drawings
Fig. 1 is the transformer on-load voltage regulating device structural representation that the embodiment of the invention one provides;
Fig. 2 is the transformer on-load voltage regulating device structural representation that the embodiment of the invention two provides;
Fig. 3 is the transformer on-load voltage regulating device structural representation that the embodiment of the invention three provides;
Fig. 4 is a kind of transformer on-load voltage regulating method flow diagram that the embodiment of the invention four provides;
Fig. 5 is another transformer on-load voltage regulating method flow diagram that the embodiment of the invention four provides;
Fig. 6 is the transformer on-load voltage regulating device structure chart that the embodiment of the invention five provides;
Fig. 7 is the transformer on-load voltage regulating method flow diagram that the embodiment of the invention five provides.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment one
For the pressure regulation process that makes transformer does not produce electric arc, tap-change operation transient process elapsed time is short, and present embodiment provides a kind of transformer on-load voltage regulating device, and referring to Fig. 1, this device comprises:
At least two step voltage handoff leg, every step voltage handoff leg all is electrically connected with Transformer Winding, and is in parallel between every step voltage handoff leg;
Every step voltage handoff leg comprises: first switch module is used to control the break-make of the voltage handoff leg at the first switch module place;
The current over-zero handover module, in parallel with first switch module, be used under the effect of control signal the break-make of the voltage handoff leg at control place when the current over-zero of every step voltage handoff leg.
Need to prove that only draw a phase circuit of three-phase transformer of Fig. 1 is the example explanation, other two-phase circuits are same as shown in Figure 1.
The transformer on-load voltage regulating device that present embodiment provides, by the current over-zero handover module under the effect of control signal, the break-make of control place voltage handoff leg when the current over-zero of every step voltage handoff leg, with the switch control module co-operating, realize when current over-zero, switching between the voltage handoff leg, therefore eliminated the electric arc that produces in the handoff procedure; Simultaneously, the current over-zero handover module is compared the mechanical switch quick action as power electronic device, and the response time is short, the accurate control when helping pressure regulation.
Embodiment two
For the pressure regulation process that makes transformer does not produce electric arc, tap-change operation transient process elapsed time is short, and present embodiment provides a kind of transformer on-load voltage regulating device, referring to Fig. 2, is the example explanation with the tertiary voltage handoff leg, and this device comprises:
The tertiary voltage handoff leg, every step voltage handoff leg is electrically connected with Transformer Winding by tap, and is in parallel between every step voltage handoff leg; Every step voltage handoff leg comprises: first switch module and a current over-zero handover module, this current over-zero handover module is in parallel with first switch module.
Wherein, first switch module can be selected switches such as magnetic latching relay, circuit breaker or contactor for use; The current over-zero handover module can be selected Group of Silicon Controlled Rectifier for use; Further, Group of Silicon Controlled Rectifier can be bidirectional triode thyristor or two antiparallel one-way SCRs.Be that Group of Silicon Controlled Rectifier is the example explanation with the current over-zero handover module in the embodiment of the invention.
Need to prove that only draw a phase circuit of three-phase transformer of Fig. 2 is the example explanation, other two-phase circuits are same as shown in Figure 2.
Illustrate that in conjunction with device shown in Figure 2 its course of work is as follows:
(1) process of boosting:
Initial condition is in conducting state for switch module J1, and switch module J2 and switch module J3 all are in off-state; The first order voltage handoff leg at switch module J1 place is in conducting state.
When needs boost, give and the Group of Silicon Controlled Rectifier S1 control signal of switch module J1 parallel connection cut-off switch module J 1 simultaneously, Group of Silicon Controlled Rectifier S1 conducting when switch module J1 disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J1 disconnects, disconnect the control signal of Group of Silicon Controlled Rectifier S1, because flowing through the electric current of Group of Silicon Controlled Rectifier S1 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, Group of Silicon Controlled Rectifier S1 disconnects, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, module J 2 simultaneously closes a switch, after switch module J2 connects then Group of Silicon Controlled Rectifier S2 by short circuit, turn-off voluntarily, circuit switches to second level voltage handoff leg (being the voltage handoff leg at switch module J2 and Group of Silicon Controlled Rectifier S2 place) by first order voltage handoff leg, realizes once boosting.
Wherein, one section Preset Time is that intrinsic branch, closing time according to switches such as relay, circuit breaker or contactors determined.
In the said process, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, give Group of Silicon Controlled Rectifier S2 control signal at once, trigger its conducting, module J 2 simultaneously closes a switch, the reason of this course of action is as follows: since operate time of Group of Silicon Controlled Rectifier S2 be the microsecond level, be Millisecond the operate time of switch module J2, and the cycle of the alternating current of 50Hz is 20ms, and alternating current reaches peak value in one-period time is 5ms, therefore, in order to guarantee circuit current over-zero and do not reach peak value when inter-stage switches, need conducting Group of Silicon Controlled Rectifier S2 and switch module J2 simultaneously, Group of Silicon Controlled Rectifier S2 is short operate time, conducting is fast, can conducting when current over-zero; Switch module J2 operate time, relative Group of Silicon Controlled Rectifier S2 was slower, after switch module J2 connects, with Group of Silicon Controlled Rectifier S2 short circuit, entered the normal operating conditions of second level voltage handoff leg.
The voltage handoff leg is in running order in the second level, in the time of need boosting once more, gives and the Group of Silicon Controlled Rectifier S2 control signal of switch module J2 parallel connection cut-off switch module J 2 simultaneously, Group of Silicon Controlled Rectifier S2 conducting this moment; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J2 disconnects, disconnect the control signal of Group of Silicon Controlled Rectifier S2, because flowing through the electric current of Group of Silicon Controlled Rectifier S2 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S2, Group of Silicon Controlled Rectifier S2 disconnects, give Group of Silicon Controlled Rectifier S 3 control signals at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, module J 3 simultaneously closes a switch, after switch module J3 connects then Group of Silicon Controlled Rectifier S3 by short circuit, turn-off voluntarily, circuit switches to third level voltage handoff leg (being the voltage handoff leg at switch module J3 and Group of Silicon Controlled Rectifier S3 place) by second level voltage handoff leg, realizes boosting again.
The principle of this process with boost for the first time identically, repeat no more herein.In addition, need to prove that the multilevel voltage handoff leg can realize repeatedly boosting, present embodiment is realized boosting for twice with the tertiary voltage handoff leg and is the example explanation, but the embodiment of the invention is not construed as limiting.
(2) step-down process:
Present embodiment is after the above-mentioned process of boosting, and switch module J3 is in conducting state, and switch module J1 and switch module J2 all are in off-state; The first order voltage handoff leg at switch module J3 place is in conducting state.
When the needs step-down, give and the Group of Silicon Controlled Rectifier S3 control signal of switch module J3 parallel connection cut-off switch module J 3 simultaneously, Group of Silicon Controlled Rectifier S3 conducting when switch module J3 disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J3 disconnects, disconnect the control signal of Group of Silicon Controlled Rectifier S3, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S3, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, module J 2 simultaneously closes a switch, after switch module J2 connects then Group of Silicon Controlled Rectifier S2 by short circuit, turn-off voluntarily, circuit switches to second level voltage handoff leg by third level voltage handoff leg, realizes a step-down.
Step-down for the second time is identical with the Principle of Process of step-down for the first time, repeats no more herein.If the progression of voltage handoff leg is many, then can realize multistage step-down in this way.
Present embodiment adopts the conducting and the disconnection of electronic device collaborative switch module control voltage handoff leg on sequential such as Group of Silicon Controlled Rectifier, make between the voltage handoff leg and when the alternating current zero passage, switch, therefore eliminated the electric arc that produces because of the electric current existence in the handoff procedure; Simultaneously, the conducting turn-off time of power electronic device such as Group of Silicon Controlled Rectifier short (microsecond level), therefore, it is short that the switching transient process required time of voltage is compared the settling time of using mechanical switch to switch, generally speaking, the time that the former needs is in 50ms, and the latter is generally more than several seconds.
Embodiment three
Present embodiment increases a second switch module on every step voltage handoff leg on the basis of a last embodiment, Group of Silicon Controlled Rectifier is played a protective role, and referring to Fig. 3, is the transformer on-load voltage regulating device that present embodiment provides, and this device comprises:
The tertiary voltage handoff leg, every step voltage handoff leg is electrically connected with Transformer Winding by tap, and is in parallel between every step voltage handoff leg; Every step voltage handoff leg comprises: connect with the second switch module behind two switch modules and a current over-zero handover module, this current over-zero handover module and the first switch module parallel connection again.
Wherein, first switch module in parallel with the current over-zero handover module can be selected switches such as magnetic latching relay, circuit breaker or contactor for use; Other switch module can be selected switches such as magnetic latching relay, circuit breaker or contactor for use; The current over-zero handover module can be selected Group of Silicon Controlled Rectifier for use; Further, Group of Silicon Controlled Rectifier can be bidirectional triode thyristor or two antiparallel one-way SCRs.Be that Group of Silicon Controlled Rectifier is the example explanation with the current over-zero handover module in the embodiment of the invention.
Need to prove that only draw a phase circuit of three-phase transformer of Fig. 3 is the example explanation, other two-phase circuits are same as shown in Figure 3.
Illustrate that in conjunction with device shown in Figure 3 its course of work is as follows:
(1) process of boosting:
Initial condition is that switch module J11 and switch module J12 are in conducting state, and other switch modules all are in off-state; The first order voltage handoff leg at switch module J11 and switch module J12 place is in conducting state.
When needs boost, give and the Group of Silicon Controlled Rectifier S1 control signal of switch module J11 parallel connection cut-off switch module J 11, the switch module J22 of second level voltage handoff leg that closes simultaneously, Group of Silicon Controlled Rectifier S1 conducting when switch module J11 disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J11 disconnects, switch module J22 closes, disconnect the control signal of Group of Silicon Controlled Rectifier S1, because flowing through the electric current of Group of Silicon Controlled Rectifier S1 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, Group of Silicon Controlled Rectifier S1 disconnects, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J21 in parallel in the second level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S2, cut-off switch module J 12 is after switch module J21 connects, Group of Silicon Controlled Rectifier S2 is by short circuit, turn-off voluntarily, it (is switch module J21 that circuit switches to second level voltage handoff leg by first order voltage handoff leg, the voltage handoff leg at switch module J22 and Group of Silicon Controlled Rectifier S2 place), realize once boosting.
Wherein, one section Preset Time is that intrinsic branch, closing time according to switches such as relay, circuit breaker or contactors determined.
In the said process, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, give Group of Silicon Controlled Rectifier S2 control signal at once, trigger its conducting, the module J 21 that closes a switch simultaneously, it is identical with reason among the embodiment two to disconnect the reason of this course of action of J12, repeats no more herein.
The voltage handoff leg is in running order in the second level, in the time of need boosting once more, give Group of Silicon Controlled Rectifier S2 control signal with switch module J21 parallel connection, while cut-off switch module J 21, the switch module J32 of third level voltage handoff leg that closes, Group of Silicon Controlled Rectifier S2 conducting when switch module J21 disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J21 disconnects, switch module J32 closes, disconnect the control signal of Group of Silicon Controlled Rectifier S2, because flowing through the electric current of Group of Silicon Controlled Rectifier S2 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S2, Group of Silicon Controlled Rectifier S2 disconnects, give Group of Silicon Controlled Rectifier S3 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J31 in parallel in the third level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S3, cut-off switch module J 22, after switch module J31 connects, Group of Silicon Controlled Rectifier S3 is by short circuit, turn-off voluntarily, it (is switch module J31 that circuit switches to third level voltage handoff leg by second level voltage handoff leg, the voltage handoff leg at switch module J32 and Group of Silicon Controlled Rectifier S3 place), realize boosting again.
The principle of this process with boost for the first time identically, repeat no more herein.
(2) step-down process
Present embodiment is after the above-mentioned process of boosting, and switch module J31 and switch module J32 are in conducting state, and other switch modules all are in off-state; The third level voltage handoff leg at switch module J31 and switch module J32 place is in conducting state.
When the needs step-down, give and the Group of Silicon Controlled Rectifier S3 control signal of switch module J31 parallel connection cut-off switch module J 31, the switch module J22 of second level voltage handoff leg that closes simultaneously, Group of Silicon Controlled Rectifier S3 conducting when switch module J31 disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J31 disconnects, switch module J22 closes, disconnect the control signal of Group of Silicon Controlled Rectifier S3, because flowing through the electric current of Group of Silicon Controlled Rectifier S3 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S3, Group of Silicon Controlled Rectifier S3 turn-offs voluntarily, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J21 in parallel in the second level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S2, cut-off switch module J 32, after switch module J21 connects, Group of Silicon Controlled Rectifier S2 is by short circuit, turn-off voluntarily, it (is switch module J21 that circuit switches to second level voltage handoff leg by third level voltage handoff leg, the voltage handoff leg at switch module J22 and Group of Silicon Controlled Rectifier S2 place), realize a step-down.
Step-down for the second time is identical with the Principle of Process of step-down for the first time, repeats no more herein.If the progression of voltage handoff leg is many, then can realize multistage step-down in this way.
Present embodiment increases a switch module respectively in every step voltage handoff leg on the basis of Fig. 2, can play a protective role to Group of Silicon Controlled Rectifier.For example, when switch module J2 connected, voltage was all born at Group of Silicon Controlled Rectifier S1 and S3 two ends among Fig. 2, when overvoltage occurring, can damage Group of Silicon Controlled Rectifier; After in every step voltage handoff leg, increasing a switch module respectively; as shown in Figure 3; when switch module J21 and J22 connection; because switch module J32 and switch module J12 all disconnect; therefore first order voltage handoff leg and third level voltage handoff leg all are off states; voltage is not born in the Group of Silicon Controlled Rectifier both sides, has played protective effect.
Embodiment four
As shown in Figure 4, present embodiment provides a kind of pressure regulation method of the transformer on-load voltage regulating device based on embodiment two, comprising:
Initial condition is that first switch module in the first order voltage handoff leg is in conducting state, and other switch modules in the device all are in off-state.
401: disconnect first switch module in the first order voltage handoff leg, transmit control signal conducting first order voltage handoff leg for the current over-zero handover module in the first order voltage handoff leg simultaneously;
402: behind the one section Preset Time of delaying time, disconnect the control signal of the current over-zero handover module in the first order voltage handoff leg;
403: when detecting the current over-zero disconnection of flowing through the current over-zero handover module in the first order voltage handoff leg, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, conducting second level voltage handoff leg;
404: connect first switch module in the voltage handoff leg of the second level, the current over-zero handover module short circuit in the voltage handoff leg of the second level.
Wherein, one section Preset Time is that intrinsic branch, closing time according to relay or on-load voltage regulating switch determined.
When every step voltage handoff leg also comprises the second switch module, correspondingly, as shown in Figure 5, present embodiment provides a kind of pressure regulation method of the transformer on-load voltage regulating device based on embodiment three, comprising:
Initial condition is that first switch module and the second switch module in the first order voltage handoff leg all is in conducting state, and other switch modules in the device all are in off-state.
501: disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, conducting first order voltage handoff leg, and the second switch module in the voltage handoff leg of the connection second level;
502: behind the one section Preset Time of delaying time, disconnect the control signal of the current over-zero handover module in the first order voltage handoff leg;
503: when detecting the current over-zero disconnection of flowing through the current over-zero handover module in the first order voltage handoff leg, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, conducting second level voltage handoff leg;
504: connect first switch module in the voltage handoff leg of the second level, the current over-zero handover module short circuit in the voltage handoff leg of the second level, and the second switch module in the disconnection first order voltage handoff leg.
The transformer on-load voltage regulating method that present embodiment provides, by the current over-zero handover module under the effect of control signal, the break-make of control place voltage handoff leg when the current over-zero of every step voltage handoff leg, with the switch control module co-operating, realize when current over-zero, switching between the voltage handoff leg, therefore eliminated the electric arc that produces in the handoff procedure; Simultaneously, the current over-zero handover module is compared the mechanical switch quick action as power electronic device, and the response time is short, the accurate control when helping pressure regulation.
Embodiment five
Present embodiment increases by one the 3rd switch module on every step voltage handoff leg on the basis of embodiment two, Group of Silicon Controlled Rectifier is played a protective role, and referring to Fig. 6, is the transformer on-load voltage regulating device that present embodiment provides, and this device comprises:
The tertiary voltage handoff leg, every step voltage handoff leg is electrically connected with Transformer Winding by tap, and is in parallel between every step voltage handoff leg; Every step voltage handoff leg comprises: two switch modules and a current over-zero handover module, this current over-zero handover module is with in parallel with first switch module again after the 3rd switch module is connected.
Wherein, the 3rd switch module of connecting with the current over-zero handover module can be selected switches such as magnetic latching relay, circuit breaker or contactor for use; Other switch module can be selected switches such as magnetic latching relay, circuit breaker or contactor for use; The current over-zero handover module can be selected Group of Silicon Controlled Rectifier for use; Further, Group of Silicon Controlled Rectifier can be bidirectional triode thyristor or two antiparallel one-way SCRs.Be that Group of Silicon Controlled Rectifier is the example explanation with the current over-zero handover module in the embodiment of the invention.
Need to prove that only draw a phase circuit of three-phase transformer of Fig. 6 is the example explanation, other two-phase circuits are same as shown in Figure 6.
Illustrate that in conjunction with device shown in Figure 6 its course of work is as follows:
(1) process of boosting:
Initial condition is that switch module J1a and switch module J1b are in conducting state, and other switch modules all are in off-state; The first voltage handoff leg at switch module J1a and switch module J1b place is in conducting state.
When needs boost, give the Group of Silicon Controlled Rectifier S1 control signal of connecting, while cut-off switch module J 1a, the switch module J2b of second level voltage handoff leg that closes, Group of Silicon Controlled Rectifier S1 conducting when switch module J1a disconnects with switch module J1b; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J1a disconnects, switch module J2b closes, disconnect the control signal of Group of Silicon Controlled Rectifier S1, because flowing through the electric current of Group of Silicon Controlled Rectifier S1 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, Group of Silicon Controlled Rectifier S1 disconnects, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J2a in parallel in the second level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S2, cut-off switch module J 1b is after switch module J2a connects, Group of Silicon Controlled Rectifier S2 is by short circuit, turn-off voluntarily, it (is switch module J2a that circuit switches to second level voltage handoff leg by first order voltage handoff leg, the voltage handoff leg at switch module J2b and Group of Silicon Controlled Rectifier S2 place), realize once boosting.
Wherein, one section Preset Time is that intrinsic branch, closing time according to switches such as relay, circuit breaker or contactors determined.
In the said process, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S1, give Group of Silicon Controlled Rectifier S2 control signal at once, trigger its conducting, the module J that closes a switch simultaneously 2a, the reason of this course of action of disconnection J1b is identical with the reason among the embodiment two, repeats no more herein.
The voltage handoff leg is in running order in the second level, in the time of need boosting once more, give Group of Silicon Controlled Rectifier S2 control signal with switch module J2b series connection, while cut-off switch module J 2a, the switch module J3b of third level voltage handoff leg that closes, Group of Silicon Controlled Rectifier S2 conducting when switch module J2a disconnects; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J2a disconnects, switch module J3b closes, disconnect the control signal of Group of Silicon Controlled Rectifier S2, because flowing through the electric current of Group of Silicon Controlled Rectifier S2 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S2, Group of Silicon Controlled Rectifier S2 disconnects, give Group of Silicon Controlled Rectifier S3 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J3a in parallel in the third level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S3, cut-off switch module J 2b, after switch module J3a connects, Group of Silicon Controlled Rectifier S3 is by short circuit, turn-off voluntarily, it (is switch module J3a that circuit switches to third level voltage handoff leg by second level voltage handoff leg, the voltage handoff leg at switch module J3b and Group of Silicon Controlled Rectifier S3 place), realize boosting again.
The principle of this process with boost for the first time identically, repeat no more herein.
(2) step-down process
Present embodiment is after the above-mentioned process of boosting, and switch module J3a and switch module J3b are in conducting state, and other switch modules all are in off-state; The third level voltage handoff leg at switch module J3a and switch module J3b place is in conducting state.
When the needs step-down, give the Group of Silicon Controlled Rectifier S3 control signal of connecting, while cut-off switch module J 3a, the switch module J2b of second level voltage handoff leg that closes, Group of Silicon Controlled Rectifier S3 conducting when switch module J3a disconnects with switch module J3b; Delay time behind one section Preset Time (more than the 10ms), guarantee that switch module J3a disconnects, switch module J2b closes, disconnect the control signal of Group of Silicon Controlled Rectifier S3, because flowing through the electric current of Group of Silicon Controlled Rectifier S3 is alternating current, when detecting the current over-zero that flows through Group of Silicon Controlled Rectifier S3, Group of Silicon Controlled Rectifier S3 turn-offs voluntarily, give Group of Silicon Controlled Rectifier S2 control signal at once, this control signal is kept one section Preset Time (more than the 10ms), trigger its conducting, the switch module J2a in parallel in the second level voltage handoff leg of closing simultaneously with Group of Silicon Controlled Rectifier S2, cut-off switch module J 3b, after switch module J2a connects, Group of Silicon Controlled Rectifier S2 is by short circuit, turn-off voluntarily, it (is switch module J2a that circuit switches to second level voltage handoff leg by third level voltage handoff leg, the voltage handoff leg at switch module J2b and Group of Silicon Controlled Rectifier S2 place), realize a step-down.
Step-down for the second time is identical with the Principle of Process of step-down for the first time, repeats no more herein.If the progression of voltage handoff leg is many, then can realize multistage step-down in this way.
Present embodiment increases a switch module respectively in every step voltage handoff leg on the basis of Fig. 2, can play a protective role to Group of Silicon Controlled Rectifier.For example, when switch module J2 connected, voltage was all born at Group of Silicon Controlled Rectifier S1 and S3 two ends among Fig. 2, when overvoltage occurring, can damage Group of Silicon Controlled Rectifier; After in every step voltage handoff leg, increasing a switch module respectively; as shown in Figure 5; when switch module J2a and J2b connection; because switch module J3b and switch module J1b all disconnect; therefore first order voltage handoff leg and third level voltage handoff leg all are off states; voltage is not born in the Group of Silicon Controlled Rectifier both sides, has played protective effect.
As shown in Figure 7, present embodiment also provides a kind of pressure regulation method based on above-mentioned transformer on-load voltage regulating device, comprising:
Initial condition is that first switch module and the 3rd switch module in the first order voltage handoff leg all is in conducting state, and other switch modules in the device all are in off-state.
701: disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, conducting first order voltage handoff leg, and the 3rd switch module in the voltage handoff leg of the connection second level;
702: behind the one section Preset Time of delaying time, disconnect the control signal of the current over-zero handover module in the first order voltage handoff leg;
703: when detecting the current over-zero disconnection of flowing through the current over-zero handover module in the first order voltage handoff leg, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, conducting second level voltage handoff leg;
704: connect first switch module in the voltage handoff leg of the second level, the current over-zero handover module short circuit in the voltage handoff leg of the second level, and the second switch module in the disconnection first order voltage handoff leg.
Wherein, one section Preset Time is that intrinsic branch, closing time according to switches such as relay, circuit breaker or contactors determined.
The transformer on-load voltage regulating scheme that present embodiment provides, by the current over-zero handover module under the effect of control signal, the break-make of control place voltage handoff leg when the current over-zero of every step voltage handoff leg, with the switch control module co-operating, realize when current over-zero, switching between the voltage handoff leg, therefore eliminated the electric arc that produces in the handoff procedure; Simultaneously, the current over-zero handover module is compared the mechanical switch quick action as power electronic device, and the response time is short, the accurate control when helping pressure regulation.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a transformer on-load voltage regulating device comprises Transformer Winding, it is characterized in that, described device comprises:
At least two step voltage handoff leg, every step voltage handoff leg all is electrically connected with described Transformer Winding, and is in parallel between every step voltage handoff leg;
Every step voltage handoff leg comprises: first switch module is used to control the break-make of the voltage handoff leg at its place;
The current over-zero handover module, in parallel with described first switch module, be used under the effect of control signal, when the current over-zero of every step voltage handoff leg, control the break-make of the voltage handoff leg at described current over-zero handover module place;
Described every step voltage handoff leg also comprises: second switch module or the 3rd switch module; After described first switch module and the parallel connection of described current over-zero handover module, parallel branch is connected with described second switch module; Described the 3rd switch module is with after described current over-zero handover module is connected, and series arm is in parallel with described first switch module.
2. device according to claim 1 is characterized in that, described first switch module is magnetic latching relay, circuit breaker or contactor; Described second switch module is magnetic latching relay, circuit breaker or contactor.
3. device according to claim 1 is characterized in that, described first switch module is magnetic latching relay, circuit breaker or contactor; Described the 3rd switch module is magnetic latching relay, circuit breaker or contactor.
4. according to the described device of the arbitrary claim of claim 1-3, it is characterized in that described current over-zero handover module is a Group of Silicon Controlled Rectifier.
5. device according to claim 4 is characterized in that, described Group of Silicon Controlled Rectifier is two antiparallel one-way SCRs or a bidirectional triode thyristor.
6. a pressure regulation method that utilizes transformer on-load voltage regulating device as claimed in claim 1 is characterized in that, described method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal the described first order voltage of conducting handoff leg for the current over-zero handover module in the first order voltage handoff leg simultaneously;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level.
7. method according to claim 6 is characterized in that, when described every step voltage handoff leg also comprises the second switch module, after described first switch module and the parallel connection of described current over-zero handover module, parallel branch is connected with described second switch module, and correspondingly, described method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, the described first order voltage of conducting handoff leg, and the second switch module in the voltage handoff leg of the connection second level;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level, and disconnect second switch module in the described first order voltage handoff leg.
8. method according to claim 6 is characterized in that, when described every step voltage handoff leg also comprises the 3rd switch module, described the 3rd switch module is with after described current over-zero handover module is connected, series arm is in parallel with described first switch module, and correspondingly, described method comprises:
Disconnect first switch module in the first order voltage handoff leg, transmit control signal for the current over-zero handover module in the first order voltage handoff leg simultaneously, the described first order voltage of conducting handoff leg, and the 3rd switch module in the voltage handoff leg of the connection second level;
Delay time behind one section Preset Time, disconnect the control signal of the current over-zero handover module in the described first order voltage handoff leg;
When detecting the current over-zero that flows through the current over-zero handover module in the described first order voltage handoff leg, current over-zero handover module in the described first order voltage handoff leg disconnects, for the current over-zero handover module in the voltage handoff leg of the second level transmits control signal, the described second level of conducting voltage handoff leg;
Connect first switch module in the voltage handoff leg of the described second level, the current over-zero handover module short circuit in the voltage handoff leg of the described second level, and disconnect the 3rd switch module in the described first order voltage handoff leg.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100885790A CN101630916B (en) | 2009-07-08 | 2009-07-08 | Transformer on-load voltage regulating device and method therefor |
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| CN2009100885790A CN101630916B (en) | 2009-07-08 | 2009-07-08 | Transformer on-load voltage regulating device and method therefor |
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| CN101630916A CN101630916A (en) | 2010-01-20 |
| CN101630916B true CN101630916B (en) | 2011-04-27 |
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| CN103051048A (en) * | 2012-12-26 | 2013-04-17 | 华为技术有限公司 | Loop switching method, device and system |
| BR112017011004A2 (en) * | 2014-11-25 | 2018-02-14 | Hai Wang | on-load voltage regulation bypass switch for transformer and switch control method |
| CN109274174A (en) * | 2018-11-20 | 2019-01-25 | 广东电网有限责任公司 | A kind of single-phase increasing apparatus free of discontinuities of feeder line and its control method |
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