阅读说明：本技术 变压器有载调压开关 (On-load tap-changer of transformer ) 是由 方健 林翔 覃煜 尹旷 张行 张敏 何嘉兴 于 2019-07-30 设计创作，主要内容包括：本发明提供一种变压器有载调压开关,包括第一电力电子开关、第二电力电子开关、切换开关、限流电阻R1、第一开关及第二开关；第一开关的第一端依次通过限流电阻R1及第一电力电子开关与电源连接,第一开关的第二端与变压器的第一抽头连接,切换开关的公共端通过第二电力电子开关与电源连接,切换开关的第一触点与变压器的第一抽头连接,切换开关的第二触点与变压器的第二抽头连接,第二开关的两端分别与第二电力电子开关的两端连接,通过设置电力电子开关及限流电阻可以实现变压器抽头间的无弧切换,切换完成后,电源通过第二开关及切换开关给变压器供电,使得电力电子开关无需长期接入电路中,降低了有载调压开关的故障率,减少维护成本。(The present invention provides a kind of on-load tap-changer of transformer, including the first electronic power switch, the second electronic power switch, switching switch, current-limiting resistance R1, first switch and second switch；The first end of first switch passes sequentially through current-limiting resistance R1 and the first electronic power switch connects to power supply, the second end of first switch and the first tap of transformer connect, the common end of switching switch is connected to power supply by the second electronic power switch, first tap of the first contact and transformer that switch switch connects, second tap of the second contact and transformer that switch switch connects, the both ends of second switch are connect with the both ends of the second electronic power switch respectively, the commutating without arcing between transformer tapping may be implemented by setting electronic power switch and current-limiting resistance, after the completion of switching, power supply is by second switch and switching switch to transformer-supplied, so that electronic power switch is without in long-term access circuit, reduce the failure rate of on-load voltage regulating switch, reduce maintenance cost.)

1. a kind of on-load tap-changer of transformer, which is characterized in that opened including the first electronic power switch, the second power electronics It closes, switch switch, current-limiting resistance R1, first switch and second switch；

For connecting power supply, the second end of first electronic power switch passes through the first end of first electronic power switch The current-limiting resistance R1 is connect with the first end of the first switch, and the second end of the first switch is used for the with transformer The connection of one tap, the first end of second electronic power switch is for connecting power supply, and the of second electronic power switch Two ends are connect with the common end of the switching switch, and the first contact of the switching switch is used to take out with the first of the transformer Head connection, the second contact of the switching switch with the second tap of the transformer for connecting, and the two of the second switch End is connect with the both ends of second electronic power switch respectively.

2. on-load tap-changer of transformer according to claim 1, which is characterized in that the first electronic power switch packet Include insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2, diode D1 and diode D2, the insulated gate bipolar The collector of transistor npn npn Q1 is connect by the current-limiting resistance R1 with the first end of the first switch, the insulated gate bipolar The emitter of transistor npn npn Q1 is connect with the emitter of the insulated gate bipolar transistor Q2, the insulated gate bipolar crystal The collector of pipe Q2 is for connecting the power supply, the hair of the anode and the insulated gate bipolar transistor Q1 of the diode D1 Emitter-base bandgap grading connection, the cathode of the diode D1 are connect with the collector of the insulated gate bipolar transistor Q1, the diode The anode of D2 is connect with the emitter of the insulated gate bipolar transistor Q2, the cathode and the insulated gate of the diode D2 The collector of bipolar junction transistor Q2 connects.

3. on-load tap-changer of transformer according to claim 1, which is characterized in that the second electronic power switch packet Include insulated gate bipolar transistor Q3, insulated gate bipolar transistor Q4, diode D4 and diode D5, the insulated gate bipolar The collector of transistor npn npn Q3 is connect with the common end of the switching switch, the emitter of the insulated gate bipolar transistor Q3 It is connect with the emitter of the insulated gate bipolar transistor Q4, the collector of the insulated gate bipolar transistor Q4 is for connecting The power supply is connect, the anode of the diode D3 is connect with the emitter of the insulated gate bipolar transistor Q3, two pole The cathode of pipe D3 is connect with the collector of the insulated gate bipolar transistor Q3, anode and the insulation of the diode D4 The emitter of grid bipolar junction transistor Q4 connects, the collection of the cathode of the diode D4 and the insulated gate bipolar transistor Q4 Electrode connection.

4. on-load tap-changer of transformer according to claim 1, which is characterized in that it further include capacitor C1 and resistance R2, The first end of first electronic power switch passes through the capacitor C1 and resistance R2 and first electronic power switch Second end connection.

5. on-load tap-changer of transformer circuit according to claim 1, which is characterized in that further include resistance R3 and capacitor The first end of C2, second electronic power switch are opened by the capacitor C2 and resistance R3 with second power electronics The second end of pass connects.

6. on-load tap-changer of transformer according to claim 1, which is characterized in that the switching switch is single-pole double throw Switch, the second end of second electronic power switch are connect with the common end of the single-pole double-throw switch (SPDT), the single-pole double throw First contact of switch for connect with the first tap of the transformer, the second contact of the single-pole double-throw switch (SPDT) for Second tap of the transformer connects.

7. on-load tap-changer of transformer according to claim 1, which is characterized in that the first switch and described second Switch is permanent-magnetic switching.

8. on-load tap-changer of transformer according to claim 1, which is characterized in that first electronic power switch and The rated current I of second electronic power switch_sMeet following relational expression:

Wherein, U_NFor transformer primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer accounts for volume Constant voltage percentage, ω are angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

9. on-load tap-changer of transformer according to claim 1, which is characterized in that first electronic power switch and The voltage rating U of second electronic power switch_sMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, S_NFor distribution Transformer rated capacity.

10. on-load tap-changer of transformer according to claim 1, which is characterized in that the first switch, described second The voltage rating U of switch and the switching switch_rWith rated current I_rMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, U_NFor transformation Device primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer account for voltage rating percentage, and ω is Angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

Technical field

The present invention relates to technical field of power systems, more particularly to a kind of on-load tap-changer of transformer.

Background technique

As power consumer constantly increases to what quality of voltage required, load tap changing distribution transformer is adjusted as voltage The advantages of one of capital equipment has range of regulation big, do not power off during pressure regulation, has obtained answering extensively in power distribution network With.Currently, generalling use tradition machinery formula on-load voltage regulating switch to adjust the output voltage of transformer, but since mechanical contact is cut Electric arc can be generated when changing, and lead to problems such as on-load regulator transformer high failure rate, maintenance cost big.

And some improved on-load voltage regulating switch replace tradition machinery contact using power electronic devices, by leading on and off Power electronic devices is opened, the commutating without arcing between transformer tapping is realized, is cut although solving mechanical on-load voltage regulating switch The arcing problems generated when changing, but power electronic devices need to access circuit, under the action of high-voltage large current, electric power for a long time Electronic device failure rate significantly increases, and threatens the reliability service of on-load voltage regulating switch.

Summary of the invention

Based on this, it is necessary to the problem of needle tradition on-load voltage regulating switch high failure rate, provide a kind of transformer on-load voltage regulating Switch.

A kind of on-load tap-changer of transformer, including the first electronic power switch, the second electronic power switch, switching open Pass, current-limiting resistance R1, first switch and second switch；

The first end of first electronic power switch is for connecting power supply, the second end of first electronic power switch It is connect by the current-limiting resistance R1 with the first end of the first switch, the second end of the first switch is used for and transformer The connection of the first tap, the first end of second electronic power switch is for connecting power supply, second electronic power switch Second end connect with the common end of the switching switch, the first contact of the switching switch is for the with the transformer The connection of one tap, the second contact of the switching switch with the second tap of the transformer for connecting, the second switch Both ends connect respectively with the both ends of second electronic power switch.

First electronic power switch includes insulated gate bipolar transistor Q1, insulation in one of the embodiments, The collector of grid bipolar junction transistor Q2, diode D1 and diode D2, the insulated gate bipolar transistor Q1 pass through described Current-limiting resistance R1 is connect with the first end of the first switch, the emitter of the insulated gate bipolar transistor Q1 and it is described absolutely The emitter of edge grid bipolar junction transistor Q2 connects, and the collector of the insulated gate bipolar transistor Q2 is for connecting the electricity The anode in source, the diode D1 is connect with the emitter of the insulated gate bipolar transistor Q1, and the diode D1's is negative Pole is connect with the collector of the insulated gate bipolar transistor Q1, anode and the insulated gate bipolar of the diode D2 The emitter of transistor Q2 connects, and the collector of the cathode of the diode D2 and the insulated gate bipolar transistor Q2 connect It connects.

Second electronic power switch includes insulated gate bipolar transistor Q3, insulation in one of the embodiments, Grid bipolar junction transistor Q4, diode D4 and diode D5, the collector of the insulated gate bipolar transistor Q3 are cut with described Change the common end connection of switch, the emitter of the insulated gate bipolar transistor Q3 and the insulated gate bipolar transistor Q4 Emitter connection, the collector of the insulated gate bipolar transistor Q4 for connecting the power supply, the diode D3's The positive emitter with the insulated gate bipolar transistor Q3 is connect, the cathode and the insulated gate bipolar of the diode D3 The collector of transistor npn npn Q3 connects, and the anode of the diode D4 connects with the emitter of the insulated gate bipolar transistor Q4 It connects, the cathode of the diode D4 is connect with the collector of the insulated gate bipolar transistor Q4.

The on-load tap-changer of transformer further includes capacitor C1 and resistance R2 in one of the embodiments, described The first end of first electronic power switch pass through the capacitor C1 and resistance R2 and first electronic power switch the The connection of two ends.

The on-load tap-changer of transformer circuit further includes resistance R3 and capacitor C2 in one of the embodiments, The first end of second electronic power switch passes through the capacitor C2 and resistance R3 and second electronic power switch Second end connection.

The switching switch is single-pole double-throw switch (SPDT) in one of the embodiments, second electronic power switch Second end is connect with the common end of the single-pole double-throw switch (SPDT), and the first contact of the single-pole double-throw switch (SPDT) is used for and the transformation First tap of device connects, and the second contact of the single-pole double-throw switch (SPDT) with the second tap of the transformer for connecting.

The first switch and the second switch are permanent-magnetic switching in one of the embodiments,.

The rated current I of first electronic power switch and the second electronic power switch in one of the embodiments,_s Meet following relational expression:

Wherein, U_NFor transformer primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer Voltage rating percentage is accounted for, ω is angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

The specified electricity of first electronic power switch and second electronic power switch in one of the embodiments, Press U_sMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, S_NFor Distribution transformer rated capacity.

The first switch, the voltage rating of the second switch and the switching switch in one of the embodiments, U_rWith rated current I_rMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, U_NFor Transformer primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer account for voltage rating percentage, ω is angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

Above-mentioned on-load tap-changer of transformer, by setting switching switch, with the connection of switching transformer tap and power supply Relationship is cut by the first electronic power switch and the second electronic power switch as auxiliary in transformer tapping handoff procedure Switch is changed, to realize the commutating without arcing of transformer, in addition, power supply passes through second switch and switching when transformer works normally It switchs to transformer-supplied, so that electronic power switch is without in long-term access circuit；Effectively reduce on-load voltage regulating switch Failure rate, reduce on-load voltage regulation maintenance cost.

Detailed description of the invention

Fig. 1 is the circuit diagram of on-load tap-changer of transformer in one embodiment；

Fig. 2 a is the circuit diagram of on-load tap-changer of transformer in the first stage in one embodiment；

Fig. 2 b be one embodiment in on-load tap-changer of transformer second stage circuit diagram；

Fig. 2 c be one embodiment in on-load tap-changer of transformer the phase III circuit diagram；

Fig. 2 d be one embodiment in on-load tap-changer of transformer the phase III circuit diagram.

Specific embodiment

To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure Add thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment , it is not intended that in the limitation present invention.

For example, providing a kind of on-load tap-changer of transformer, including the first electronic power switch, the second power electronics are opened It closes, switch switch, current-limiting resistance R1, first switch and second switch；

The first end of first electronic power switch is for connecting power supply, the second end of first electronic power switch It is connect by the current-limiting resistance R1 with the first end of the first switch, the second end of the first switch is used for and transformer The connection of the first tap, the first end of second electronic power switch is for connecting power supply, second electronic power switch Second end connect with the common end of the switching switch, the first contact of the switching switch is for the with the transformer The connection of one tap, the second contact of the switching switch with the second tap of the transformer for connecting, the second switch Both ends connect respectively with the both ends of second electronic power switch.

Above-mentioned on-load tap-changer of transformer, by setting switching switch, with the connection of switching transformer tap and power supply Relationship is cut by the first electronic power switch and the second electronic power switch as auxiliary in transformer tapping handoff procedure Switch is changed, to realize the commutating without arcing of transformer, in addition, power supply passes through second switch and switching when transformer works normally It switchs to transformer-supplied, so that electronic power switch is without in long-term access circuit；Effectively reduce on-load voltage regulating switch Failure rate, reduce on-load voltage regulation maintenance cost.

In one of the embodiments, referring to Fig. 1, providing a kind of on-load tap-changer of transformer 10, including the first electricity Power electronic switch 100, the second electronic power switch 200, switching switch S3, current-limiting resistance R1, first switch S1 and second switch S2；The first end of first electronic power switch 100 is for connecting power supply, and the second of first electronic power switch 100 End is connect by the current-limiting resistance R1 with the first end of the first switch S1, the second end of the first switch S1 for First tap 310 of transformer 300 connects, and the first end of second electronic power switch 200 is for connecting power supply, and described the The second end of two electronic power switches 200 is connect with the common end of the switching switch S3, the first touching of the switching switch S3 Point is connect for the first tap 310 with the transformer 300, and the second contact of the switching switch S3 is used for and the transformation Second tap 320 of device 300 connects, the both ends of the second switch S2 respectively with second electronic power switch 200 two End connection.

Specifically, the tap of transformer is to commonly use to change the method for umber of turn and adjust input voltage and output voltage Relationship, that is, when needing to adjust the output voltage of transformer, only power supply need to be connected to different taps can be thus achieved transformer Output voltage adjust.

Specifically, the both ends of the second switch S2 are connect with the both ends of second electronic power switch 200 respectively, i.e., The first end of the second switch S2 is connect with the first end of second electronic power switch 200, the second switch S2's Second end is connect with the second end of the electronic power switch.

Specifically, switching switch S3 has the first contact, the second contact and common end, user can open according to switching is adjusted The gear of S3 is closed, so that the first contact is connect with common end or the second contact is connect with common end, due to switching switch S3's Second tap of the connection of the first tap of the first contact and transformer, the second contact and transformer that switch switch S3 connects, and leads to Cross control switching switch S3, it can realize the switching of the connection relationship of power supply and tap.Electronic power switch is a kind of whole The switching device being made of semiconductor devices realizes the operation list of connecting and disconnecting of the circuit using electronic circuit and power electronic devices Member, including at least a controllable electric drive device, such as thyristor, transistor, field-effect tube, silicon-controlled, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) etc., electronic power switch have good Switch performance, be substituted for tradition machinery contact, by being connected and disconnecting power electronic devices, realize distribution transformer Commutating without arcing between tap.

Specifically, the transformer in the present embodiment is at work, input power passes through second switch S2 and switching switch S3 It is connect with the tap of transformer, i.e., at work, power supply is without the first electronic power switch 100 and the second electric power to transformer Electronic switch 200 can be to so that electronic power switch is when switching tap without only using in long-term access circuit The service life of electronic power switch is improved, guarantees the reliability service of on-load voltage regulating switch.When the tap needs of transformer are cut When changing, power supply and transformer are changed by switching switch S3, the first electronic power switch 100 and the second electronic power switch 200 Tap connection relationship, to realize transformer tapping commutating without arcing.It is that transformer is connected to power supply by the first tap and cut below Shift to the operating procedure that the second tap connects to power supply:

First contact of step 1, second switch S2 closure, switching switch S3 is connect with common end, and rest switch is in disconnected Open state.When power supply is that the first tap of transformer is powered at this time, power supply is mentioned by the branch where second switch S2 for transformer For electric energy.

Second electronic power switch 200 is closed, second switch S2 is disconnected by step 2.So that power supply passes through the second electricity Power electronic switch 200 is transmitted to the first tap of transformer, i.e., is transformer by the branch where the second electronic power switch 200 The first tap provide current path.

First electronic power switch 100 and first switch S1 are closed by step 3；At this point, by the first electronic power switch 100 and the second electronic power switch 200 where branch provide current path for the first tap of transformer.

The first contact for switching switch S3 connect with common end and is changed to the second contact and connect with common end by step 4；With So that power supply is connect with the second tap.It is noted that stage first electronic power switch 100 and the second power electronics are opened It closes 200 and is on state, so that power supply is taken out by the branch where the first electronic power switch 100 to the first of transformer Head provides power supply, and the branch where power supply also passes through the second electronic power switch 200 provides power supply to the second tap of transformer, The first tap and the second tap are shorted at this time, when by the way that current-limiting resistance R1 is arranged the first tap and the second tap being shorted, The electric current for flowing through electronic power switch is limited, to guarantee the safe operation of electronic power switch.

Step 5 disconnects the first switch S1 and the first electronic power switch 100；It is opened at this time by the second power electronics Branch where closing 200 provides current path for the second tap of transformation.

The second switch S2 is connected step 6, and the second electronic power switch 200 disconnects；At this time by second switch S2 The branch at place provides current path to the second tap of transformer, to realize the commutating without arcing of transformer tapping.

It should be appreciated that only thering is the switch of change to carry out conducting and off-state in the stage in aforesaid operations step Description, rest switch keep state on last stage.

In aforesaid operations step, since mechanical switch movement money has electronic power switch chopping current, it may be implemented to take out The commutating without arcing of head, load current is continuous in whole process, i.e. load will not be powered off because of the tap changing of transformer, this Outside, it although will appear a circulation in handoff procedure, is limited by current-limiting resistance R1, so as to being cut without arc for transformer It changes.

Above-mentioned on-load tap-changer of transformer, by setting switching switch, with the connection of switching transformer tap and power supply Relationship is cut by the first electronic power switch and the second electronic power switch as auxiliary in transformer tapping handoff procedure Switch is changed, to realize the commutating without arcing of transformer, in addition, power supply passes through second switch and switching when transformer works normally It switchs to transformer-supplied, so that electronic power switch is without in long-term access circuit；Effectively reduce on-load voltage regulating switch Failure rate, reduce on-load voltage regulation maintenance cost.

In order to make on-load voltage regulating switch further realize commutating without arcing at work, please join in one of the embodiments, Fig. 1 is read, first electronic power switch 100 includes insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2, two The collector of pole pipe D1 and diode D2, the insulated gate bipolar transistor Q1 pass through the current-limiting resistance R1 and described first The first end of switch S1 connects, the emitter of the insulated gate bipolar transistor Q1 and the insulated gate bipolar transistor Q2 Emitter connection, the collector of the insulated gate bipolar transistor Q2 for connecting the power supply, the diode D1's The positive emitter with the insulated gate bipolar transistor Q1 is connect, the cathode and the insulated gate bipolar of the diode D1 The collector of transistor npn npn Q1 connects, and the anode of the diode D2 connects with the emitter of the insulated gate bipolar transistor Q2 It connects, the cathode of the diode D2 is connect with the collector of the insulated gate bipolar transistor Q2.One embodiment wherein In, the on-load tap-changer of transformer further includes control module, the control module and the insulated gate bipolar transistor The base stage of Q1 and the base stage of the insulated gate bipolar transistor Q2 connection, with control the insulated gate bipolar transistor Q1 and The insulated gate bipolar transistor Q2's is switched on or off.Specifically, insulated gate bipolar transistor is by BJT (Bipolar Junction Transistor, dipole triode) and MOS (metal oxide semiconductor, Metal-oxide semiconductor fieldeffect transistor) composition compound full-control type voltage driven type power semiconductor, have concurrently Advantage of both high input impedance and low conduction voltage drop.By by the emitter and insulated gate of insulated gate bipolar transistor Q1 The emitter of bipolar junction transistor Q2 connects, and the two of insulated gate bipolar transistor Q1 and insulated gate bipolar transistor Q2 End difference one diode of parallel connected in reverse phase, plays a part of protection and afterflow, when the conducting of the first electronic power switch 100, absolutely Edge grid bipolar junction transistor Q1 and diode D2, insulated gate bipolar transistor Q2 and diode D1 are connected in turn, respectively by The collector of insulated gate bipolar transistor Q1 flows to the electric current and insulated gate pair of the collector of insulated gate bipolar transistor Q2 The electric current that the collector of bipolar transistor Q2 flows to the collector of insulated gate bipolar transistor Q1 provides access；When the first electric power When electronic switch 100 disconnects, when the collector voltage of insulated gate bipolar transistor Q1 is greater than insulated gate bipolar transistor Q2 Collector voltage when, insulated gate bipolar transistor Q1 bear forward voltage, when the collection of insulated gate bipolar transistor Q1 When electrode voltage is less than the collector voltage of insulated gate bipolar transistor Q2, insulated gate bipolar transistor Q2 bears positive electricity Pressure can be two-way in the conducting of the first electronic power switch 100 as a result, by the way that such first electronic power switch 100 is arranged By electric current, when the first electronic power switch 100 disconnects can two-way withstanding voltage, to further realize transformer tapping Commutating without arcing.

In one of the embodiments, referring to Fig. 1, second electronic power switch 200 includes insulated gate bipolar Transistor Q3, insulated gate bipolar transistor Q4, diode D4 and diode D5, the collection of the insulated gate bipolar transistor Q3 Electrode is connect with the common end of the switching switch S3, the emitter and the insulated gate of the insulated gate bipolar transistor Q3 The emitter of bipolar junction transistor Q4 connects, and the collector of the insulated gate bipolar transistor Q4 is used to connect the power supply, The diode D3 anode connect with the emitter of the insulated gate bipolar transistor Q3, the cathode of the diode D3 and The collector of the insulated gate bipolar transistor Q3 connects, anode and the insulated gate bipolar crystal of the diode D4 The emitter of pipe Q4 connects, and the cathode of the diode D4 is connect with the collector of the insulated gate bipolar transistor Q4.In In one embodiment, the on-load tap-changer of transformer further includes control module, the control module and the insulation The base stage of grid bipolar junction transistor Q3 and the connection of the base stage of the insulated gate bipolar transistor Q4, it is double to control the insulated gate The bipolar transistor Q3's and insulated gate bipolar transistor Q4 is switched on or off.Specifically, the second electronic power switch 200 structure is identical as the structure of the first electronic power switch 100, in the present embodiment, repeats no more.

In order to more preferably protect the first electronic power switch, in one of the embodiments, referring to Fig. 1, the transformer On-load voltage regulating switch further includes capacitor C1 and resistance R2, and the first end of first electronic power switch 100 passes through the capacitor C1 and the resistance R2 are connect with the second end of first electronic power switch 100.Specifically, first power electronics is opened The first end of pass 100 is connect by the capacitor C1 and the resistance R2 with the second end of first electronic power switch 100, The collector of the i.e. described insulated gate bipolar transistor Q1 passes through the capacitor C1 and resistance R2 and the insulated gate bipolar The collector of transistor npn npn Q2 connects, that is to say, that the capacitor C1 connects with the resistance R2, first end and institute after series connection The collector connection for stating insulated gate bipolar transistor Q1, the second end after series connection is with the insulated gate bipolar transistor Q2's Collector connection, it should be understood that, insulated gate bipolar transistor is more sensitive to voltage and current, especially in the wink of its shutdown Between, if the bigger electric current that can generate of the voltage flowed through in the unit time flows through insulated gate bipolar transistor, so that insulated gate is double Bipolar transistor can not turn off or even mislead, can be in insulated gate bipolar crystal if the electric current flowed through in the unit time is bigger The both ends of pipe generate overvoltage, breakdown or damage insulated gate bipolar transistor.In this way, by the first electronic power switch 100 both ends parallel resistance R2 and capacitor C1 is as appearance resistance absorption circuit, when for the shutdown of absorbent insulation grid bipolar junction transistor Immediate current, so that shutdown overvoltage is reduced, preferably to protect the first electronic power switch 100.

In order to preferably protect the second electronic power switch, in one of the embodiments, referring to Fig. 1, the transformation Device on-load voltage regulating switch further includes resistance R3 and capacitor C2, and the first end of second electronic power switch 200 passes through the electricity Hold the C2 and resistance R3 to connect with the second end of second electronic power switch 200.Specifically, second power electronics The first end of switch 200 is connected by the second end of the capacitor C2 and resistance R3 and second electronic power switch 200 It connects, i.e., the collector of the described insulated gate bipolar transistor Q3 is double by the capacitor C2 and resistance R3 and the insulated gate The collector of bipolar transistor Q4 connects, that is to say, that the capacitor C2 connects with the resistance R3, the first end after series connection and The collector of the insulated gate bipolar transistor Q3 connects, second end and the insulated gate bipolar transistor Q4 after series connection Collector connection, it should be understood that, insulated gate bipolar transistor is more sensitive to voltage and current, especially its shutdown Moment, if the bigger electric current that can generate of the voltage flowed through in the unit time flows through insulated gate bipolar transistor, so that insulated gate Bipolar junction transistor can not turn off or even mislead, can be in insulated gate bipolar crystalline substance if the electric current flowed through in the unit time is bigger The both ends of body pipe generate overvoltage, breakdown or damage insulated gate bipolar transistor.In this way, by being opened in the second power electronics Both ends the parallel resistance R3 and capacitor C2 for closing 200 hinder absorption circuit as appearance, turn off for absorbent insulation grid bipolar junction transistor When immediate current, so that shutdown overvoltage is reduced, preferably to protect the second electronic power switch 200.

Switching switch is single-pole double-throw switch (SPDT) in one of the embodiments, second electronic power switch, Second end is connect with the common end of the single-pole double-throw switch (SPDT), and the first contact of the single-pole double-throw switch (SPDT) is used for and the transformation First tap of device connects, and the second contact of the single-pole double-throw switch (SPDT) with the second tap of the transformer for connecting.Tool Body, single-pole double-throw switch (SPDT) is made of moved end and non-moving end, and moved end is exactly so-called " knife ", can control power supply to two not Same direction output, that is to say, that can be used to control two equipment, or also can control same equipment work conversion and operate Direction uses, and the single-pole double-throw switch (SPDT) is single-pole double throw permanent-magnetic switching in one of the embodiments, single in the present embodiment Double-pole double throw switch can control power supply and power to the first tap of transformer or the second tap, preferably to realize that transformer has load Switching when pressure regulation between tap.

The switching switch includes that third switch and the 4th switch in one of the embodiments, the third switch First end is connect with the first end of the 4th switch, and the first end of the third switch for connecting power supply, open by the third The second end of pass is used to connect the first tap of transformer, and the second end of the 4th switch is used to connect the second of transformer and takes out The first end of third switch is connect by head by the way that such switching switch is arranged with the first end of the 4th switch, equally can be real Now switch the function of switch.

The first switch and the second switch are permanent-magnetic switching in one of the embodiments,.

Switch for the ease of on-load voltage regulating switch and transformer tapping, in one of the embodiments, referring to Fig. 2, institute Stating on-load tap-changer of transformer 10 further includes driving motor 500, the first movable contact 410 and the second movable contact 420, First movable contact 410 is connect with the second end of the first switch S1, first movable contact 410 also with institute The first contact connection of switching switch S3 is stated, second movable contact 420 and the second contact of the switching switch S3 connect It connects, first movable contact 410 and second movable contact 420 with the tap of transformer for connecting respectively, institute Driving motor 500 is stated for driving first movable contact 410 and second movable contact 420 mobile, so that the One movable contact 410 and the second movable contact 420 are connect with the tap of transformer.For example, transformer has the first tap 310, the second tap 320, third tap 330, the 4th tap 340 and the 5th tap 350.Driving motor 500 is for driving first Movable contact 410 is connect with one in the first tap 310, third tap 330 and the 5th tap 350, driving described second Movable contact 420 with one in the second tap 320 and the 4th tap 340 for connecting, specifically, driving motor 500 is used In driving the first movable contact 410 and the second movable contact 420 mobile, in the first stage, as shown in Figure 2 a, driving motor 500 for driving the first movable contact 410 to connect with the first tap 310, the second movable contact 420 and the second tap 320 Connection, in second stage, driving motor 500 as shown in Figure 2 b works on, the first movable contact of driving 410 and third tap 330 connections, the second movable contact 420 is connect with the second tap 320, in the phase III, as shown in Figure 2 c, driving motor 500 It works on, the first movable contact 410 of driving is connect with third tap 330, the second movable contact 420 and the 4th tap 340 connections, in fourth stage, as shown in Figure 2 d, driving motor 500 drives the first movable contact 410 and the 5th tap 350 to connect It connects, the second movable contact 420 is connect with the 4th tap 340, so passes through setting driving motor 500, the first movable contact 410 and second mobile contact, mechanical switch condition is provided for the switching of distribution transformer adjacent taps, is simplified complicated for operation Degree, ensure that the reliability of tap changing.

In order to guarantee the reliability service of on-load voltage regulating switch, first power electronics is opened in one of the embodiments, The rated current I of pass and the second electronic power switch_sMeet following relational expression:

Wherein, U_NFor transformer primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer Voltage rating percentage is accounted for, ω is angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

Specifically, a stage due to on-load tap-changer of transformer during switching, i.e. S4 stage, the first electricity Power electronic switch and the second electronic power switch are on state, and the first tap and the second tap are shorted, power electronics Switch can be by overcurrent caused by Short Circuit Fault on Secondary Transformer, and the situation of short circuit current maximum corresponds to high voltage side of transformer For Infinite bus system, three-phase shortcircuit occurs for low-pressure side, and tranformer protection usually can not be resistance in power electronic devices pulse current Loop current by being acted in the time, therefore when the rated current of electronic power switch should be greater than Short Circuit Fault on Secondary Transformer, i.e., The rated current of electronic power switch should meet the relational expression of formula (1), so that on-load voltage regulating switch reliability service.

In order to further ensure the reliability service of on-load voltage regulating switch, first electric power in one of the embodiments, The voltage rating U of electronic switch and second electronic power switch_sMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, S_NFor Distribution transformer rated capacity.

Specifically, voltage parameter is determined by the voltage that both ends are born due to not having altogether between insulated gate bipolar transistor Fixed, at the S3 stage, when switching the common end of switch and connecting with the first contact, the second electronic power switch of conducting can bear to limit Voltage on leakage resistance R1, at the S4 stage, the second contact for switching switch is connect with common end, the second power electronics of conducting Meeting after the voltage that switch can bear a tap-changing windings is connected plus the voltage on current-limiting resistance R1, and the first electronic power switch The voltage of a tap-changing windings is born, for the voltage's distribiuting of balanced electronic power switch, the parameter of the second electronic power switch It is consistent with the parameter needs of the first electronic power switch, that is to say, that the voltage rating of electronic power switch need to be greater than pressure regulation The sum of voltage under winding and limit on current-limiting resistance R1, and blocking voltage need to be greater than tap-changing windings voltage and transformer The sum of voltage when secondary circuit short-circuit on current-limiting resistance, in this way, first electronic power switch and the second electronic power switch Voltage rating should meet the relational expressions of formula (2), to be further ensured that the reliability service of on-load voltage regulating switch.

The parameter selection such as table of the resistance R2, resistance R3, capacitor C1 and the capacitor C2 in one of the embodiments, Shown in 1:

Table 1

The first switch, the voltage rating of the second switch and the switching switch in one of the embodiments, U_rWith rated current I_rMeet following relational expression:

Wherein, R_eFor the equivalent resistance of circuit coil and route, L_eFor the equivalent leakage inductance of circuit coil and route, U_NFor Transformer primary side rated line voltage, d% winding voltage between two adjacent taps of distribution transformer account for voltage rating percentage, ω is angular speed, R_sFor the short-circuit resistance of transformer, X_sFor the short-circuit reactance of transformer.

Specifically, the first switch, the second switch and switching switch are three-phase type structure, voltage parameter Consider the phase insulation of on-load voltage regulating switch, i.e. voltage rating needs the primary side line voltage greater than transformer, and described second Switch and switching switch are series relationship, then the first switch, the second switch and the switching switch is specified Electric current can be chosen according to the rated current of electronic power switch, i.e., the described first switch, the second switch and the switching The voltage rating U of switch_rWith rated current I_rMeet the relational expression in formula (3), to guarantee that the first switch, described second open It closes and the switching switchs steady operation.

Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, all should be considered as described in this specification.

The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.