CN113889329B - On-load tap-changer switching method, circuit and device - Google Patents

On-load tap-changer switching method, circuit and device Download PDF

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Publication number
CN113889329B
CN113889329B CN202111125172.8A CN202111125172A CN113889329B CN 113889329 B CN113889329 B CN 113889329B CN 202111125172 A CN202111125172 A CN 202111125172A CN 113889329 B CN113889329 B CN 113889329B
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load
power supply
branch
controllable switch
switch
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CN113889329A (en
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肖毅
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Shanghai Huaming Power Equipment Co Ltd
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Shanghai Huaming Power Equipment Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The application relates to the field of power switches and discloses a switching method, a circuit and a device of an on-load tapping switch, wherein the method comprises the steps of establishing a first tapping branch of a conductive power supply A and a load based on the conductive power supply A and a normally closed branch of the load; breaking the normally closed branch circuit to establish a second branch circuit electrically connected between the power supply B and the load; based on the detection of the first preset electrical parameter in the second branch circuit, the second branch circuit is conducted; based on the detection of a second preset parameter after bridging the first tapping branch and the second tapping branch, disconnecting the first tapping branch, electrically connecting the first tapping branch between the power supply B and the load, and electrically connecting the normally closed branch between the power supply B and the load; based on the detection of a third preset electrical parameter in the first tapping branch, switching on the first tapping branch, switching off the second tapping branch, switching on the normally closed branch, and then switching off the first tapping branch; the application can reduce the possibility of power failure when switching the power supply and improve the power receiving stability of the load.

Description

On-load tap-changer switching method, circuit and device
Technical Field
The present application relates to the field of power switches, and in particular, to a method, a circuit, and a device for switching an on-load tap-changer.
Background
The on-load tap-changer refers to a voltage regulating device which is suitable for operating under the excitation or load of a transformer and is used for changing the tap connection position of a transformer winding. The basic principle is that under the condition of ensuring no interruption of load current, the switching between taps in the winding of the transformer is realized, so that the number of turns of the winding, namely the voltage ratio of the transformer, is changed, and the purpose of regulating voltage is finally realized.
The prior on-load tapping switch comprises a polarity switch, a gear selection switch and a transfer branch, wherein the gear selection switch is used for adjusting the size of a tapping winding connected to one end of a power supply main coil, the polarity switch is used for changing the direction of the tapping winding connected with the power supply main coil, the transfer branch is used for connecting the tapping winding to the other end of the main coil, the gear selection switch and the polarity switch are assembled together in a series connection mode with a primary side coil of a transformer body, and are connected with the transfer branch through a high-voltage sleeve, and the transfer branch is independently arranged. The polarity switch, the gear selection switch and the primary coil of the transformer are assembled together in series, and the change-over switch is independent of the transformer body. The split type change-over switch avoids the deterioration of insulating oil and the insulating performance of the moving and static contacts of the change-over switch caused by arc discharge in the conventional on-load tap-changer gear shifting process, reduces the running risk of the on-load tap-changer and further improves the running safety, reliability and stability of the whole transformer body.
In realizing the above prior art, the inventors found that there are at least the following problems in the prior art: when the on-load tap-changer acts, a transition branch which is always in conduction in the contact state replacement process of the contact is not provided, so that certain outage possibility still exists when the on-load tap-changer acts, and a space for improving the stability of a power supply when the on-load tap-changer acts is provided.
Disclosure of Invention
The application provides a switching method, a circuit and a device of an on-load tap-changer, in order to reduce the possibility of power failure during the operation of the on-load tap-changer and improve the stability of a power supply during the operation of the on-load tap-changer.
The application aims to provide a switching method of an on-load tap-changer, which adopts the following technical scheme:
the on-load tap-changer switching method comprises the following steps:
establishing a first tapping branch based on a normally closed branch for conducting a power supply A and a load, wherein the first tapping branch is connected with the normally closed branch in parallel and conducts the power supply A and the load;
disconnecting the normally closed branch and establishing a second branch, wherein the second branch is electrically connected between a power supply B and the load;
based on the detection of a preset first preset electrical parameter in the second branch, the second branch conducts the power supply B and the load;
Based on the detection of a second preset electrical parameter after bridging the first tapping branch and the second tapping branch, disconnecting the first tapping branch, electrically connecting the first tapping branch between the power supply B and the load, and electrically connecting the normally closed branch between the power supply B and the load;
and based on the detection of a third preset electrical parameter in the first tapping branch, the first tapping branch conducts the power supply B and the load, then disconnects the second tapping branch, conducts the normally closed branch, and then disconnects the first tapping branch.
By adopting the technical scheme, the first tapping branch can establish an additional conduction loop for the normally closed branch to be disconnected, meanwhile, an electric arc can not be generated when the normally closed branch is closed, the second tapping branch is used for connecting the power supply B with a load, and the power supply A and the load are powered off after stable circulation can be realized, so that the power supply can be replaced without the electric arc; when the first tapping branch is connected between the power supply B and the load, the first tapping branch is conducted, the second tapping branch is disconnected, the normally closed branch is conducted, the first tapping branch is disconnected finally, no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the method comprises the steps of:
based on the normally closed branch that turns on the power supply B and the load, the first tapping branch turns on the power supply B and the load;
disconnecting the normally closed branch and establishing a third tapping branch, the third tapping branch being electrically connected between the power supply a and the load;
based on the detection of a preset fourth preset electrical parameter in the third tapping branch, the third tapping branch conducts the power supply A and the load;
based on the detection of a fifth preset electrical parameter after bridging the first tapping branch and the third tapping branch, disconnecting the first tapping branch, electrically connecting the first tapping branch between the power supply A and the load, and electrically connecting the normally closed branch between the power supply A and the load;
and based on the detection of a preset sixth preset electrical parameter in the first tapping branch, the first tapping branch conducts the power supply B and the load, then disconnects the third tapping branch, conducts the normally closed branch, and then disconnects the first tapping branch.
By adopting the technical scheme, the third tapping branch is used for connecting the power supply A with the load, and the first tapping branch is disconnected after circulation can be stabilized so that the power supply B is disconnected with the load, thus realizing arc-free power supply replacement, the first tapping branch is connected with the power supply A and then is connected with the load, the third tapping branch is disconnected, the normally closed branch is then connected, and finally the first tapping branch is disconnected, so that no arc exists in the action process, the possibility of power failure during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the normally closed branch comprises a normally closed main switch K0, the first tapping branch comprises a normally open first controllable switch K1, the second tapping branch comprises a normally open second controllable switch K2, the first controllable switch K1 is connected with the main switch K0 in parallel, and the first controllable switch K1, the second controllable switch K2 and the main switch K0 are all electrically connected to the load; the main switch K0 conducts the power supply A and the load;
the method comprises the following steps:
generating a first conduction signal based on a switching signal of an on-load tap-changer, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
generating a main disconnect signal based on the conduction of the first tap leg, the main switch K0 opening the normally closed leg in response to the main disconnect signal;
driving one end of the second controllable switch K2 far away from the load and the power supply B to be electrically connected to detect a first voltage difference across the second controllable switch K2;
generating a second conduction signal based on the first voltage difference reaching the value of the first preset electrical parameter, wherein the second controllable switch K2 is used for responding to the second conduction signal to conduct the power supply B and the load, and the first tapping branch circuit and the second tapping branch circuit are bridged and form a first circulation circuit;
Generating a first opening signal based on the first circulating current reaching a value of the second preset electrical parameter, the first controllable switch K1 being opened in response to the first opening signal;
driving one end of the first controllable switch K1 far away from the load and the power supply B to be electrically connected to detect a second pressure difference at two ends of the first controllable switch K1, wherein one end of the normally closed branch circuit far away from the load is connected to the power supply B;
generating the first conduction signal based on the second voltage difference reaching the value of the third preset electrical parameter, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
generating a second opening signal based on the conduction of the first controllable switch K1, the second controllable switch K2 opening the second tap leg in response to the second opening signal;
generating a main conduction signal based on the disconnection of the second branching branch, wherein the main switch K0 is used for responding to the main conduction signal to conduct the power supply B and the load; the method comprises the steps of,
the first off signal is generated based on the conduction of the main switch K0, and the first controllable switch K1 is turned off in response to the first off signal.
Through adopting above-mentioned technical scheme, main switch K0 intercommunication power A and load, first controllable switch K1 intercommunication power A and load, first tapping branch establishes extra conduction return circuit for the normal close branch that will break off, can also not produce the electric arc simultaneously when closing the normal close branch, second controllable switch K2 connects power B and load, after second controllable switch K2 closed switch, first tapping branch forms stable ground circulation with second tapping branch, reopening first controllable switch K1 to realize no electric arc change power. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is closed and conducted, the second controllable switch K2 is opened, the main switch K0 is closed and conducted again, and finally the first controllable switch K1 is opened, so that no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the method is further based on a third tapping branch comprising a third controllable switch K3 that is normally open, one end of the third controllable switch K3 being electrically connected to the load and the other end being electrically connected to the power supply B, the method further comprising the steps of:
generating the first conduction signal based on a switching signal of an on-load tap-changer, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
Generating a main off signal based on the turning on of the first controllable switch K1, the main switch K0 being turned off in response to the main off signal;
driving the third controllable switch K3 and the power supply A to be electrically connected to detect that a third pressure difference at two ends of the third controllable switch K3 reaches a preset third preset electrical parameter;
generating a third conduction signal based on the formation of the third voltage difference, wherein the third controllable switch K3 is used for responding to the third conduction signal to conduct the power supply A and the load, and the first tapping branch circuit is bridged with the third tapping branch circuit and forms a second circulation circuit;
generating a first off signal based on the formation of the second circulating current, the first controllable switch K1 being opened in response to the first off signal;
driving the first controllable switch K1 and the power supply A to be electrically connected to detect that a fourth pressure difference at two ends of the first controllable switch K1 reaches a preset fourth preset electrical parameter;
generating the first conduction signal based on the formation of the fourth voltage difference, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
generating a main conduction signal based on the conduction of the first controllable switch K1, wherein the main switch K0 is used for responding to the main conduction signal to conduct the power supply A and the load;
And generating a first off signal based on the turning on of the main switch K0, the first controllable switch K1 being turned off in response to the first off signal.
Through adopting above-mentioned technical scheme, first controllable switch K1 switches on power B and load, and third controllable switch K3 connects power B and load formation second branch way, and after the closed switch-on of second controllable switch K2, first branch way and second branch way formed stable circulation, and disconnected first controllable switch K1 again to realize no electric arc and change the power. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is closed and conducted, the second controllable switch K2 is opened, the main switch K0 is closed and conducted again, and finally the first controllable switch K1 is opened, so that no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the second controllable switch K2 includes a first transition resistor R1 and a first switch Q1 electrically connected in series, an end of the first switch Q1 away from the first transition resistor R1 is electrically connected to the load, and an end of the first transition resistor R1 away from the first switch Q1 is electrically connected to the power source a or the power source B;
The third controllable switch K3 includes a second transition resistor R2 and a second switch Q2 electrically connected in series, where one end of the second switch Q2 away from the second transition resistor R2 is electrically connected with the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected with the power supply a or the power supply B.
By adopting the technical scheme, the first transition resistor R1 and the second transition resistor R2 can provide stable ground voltage difference, the accuracy of electrical parameter identification is improved, and the transition resistor is also a transition resistor for switching between different power supplies, so that faults caused by overlarge line current due to short circuit of the power supplies are avoided.
Preferably, after the first pressure difference reaches the value of the first preset electrical parameter for the first time, if the value of the first preset electrical parameter is continuously reached within a preset time, executing the next step based on the first pressure difference reaching the value of the first preset electrical parameter.
By adopting the technical scheme, after the first differential pressure is stabilized, the subsequent steps are executed, the possibility of power failure during the action of the on-load tap-changer is further reduced, and the stability of the power supply during the action of the on-load tap-changer is better improved.
The second purpose of the application is to provide a switching circuit of an on-load tap-changer, which adopts the following technical scheme:
The on-load tap changer switching circuit comprises a normally closed branch circuit, a first tap branch circuit and a second tap branch circuit, wherein the normally closed branch circuit comprises a normally closed main switch K0, the first tap branch circuit comprises a normally open first controllable switch K1, the second tap branch circuit comprises a normally open second controllable switch K2, the first controllable switch K1 is connected with the main switch K0 in parallel, and the first controllable switch K1, the second controllable switch K2 and the main switch K0 are all electrically connected to the load; the main switch K0 conducts the power supply A and the load;
the controller is in control connection with the main switch K0, the first controllable switch K1 and the second controllable switch K2;
the controller generates a first conduction signal based on a switching signal of an on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
the controller generates a main disconnect signal based on the conduction of the first tap leg, the main switch K0 opening the normally closed leg in response to the main disconnect signal;
the controller drives one end of the second controllable switch K2 far away from the load and the power supply B to be electrically connected to the first voltage difference of two ends of the second controllable switch K2;
The controller generates a second conduction signal based on the first voltage difference reaching the value of the first preset electrical parameter, the second controllable switch K2 is used for responding to the second conduction signal to conduct the power supply B and the load, and the first tapping branch circuit and the second tapping branch circuit are bridged and form a first circulation circuit;
the controller generates a first off signal based on the first circulating current reaching a value of the second preset electrical parameter, the first controllable switch K1 being opened in response to the first off signal;
the controller drives one end of the first controllable switch K1 far away from the load and the power supply B to be electrically connected to detect a second pressure difference between two ends of the first controllable switch K1, and one end of the normally closed branch, far away from the load, is connected to the power supply B;
the controller generates the first conduction signal based on the second voltage difference reaching the value of the third preset electrical parameter, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
the controller generates a second opening signal based on the conduction of the first controllable switch K1, the second controllable switch K2 opening the second tap branch in response to the second opening signal;
The controller generates a main conduction signal based on the disconnection of the second branching branch, and the main switch K0 responds to the main conduction signal to conduct the power supply B and the load; the method comprises the steps of,
the controller generates the first off signal based on the conduction of the main switch K0, and the first controllable switch K1 is turned off in response to the first off signal.
Through adopting above-mentioned technical scheme, main switch K0 intercommunication power A and load, first controllable switch K1 intercommunication power A and load, first tapping branch establishes extra conduction return circuit for the normal close branch that will break off, can also not produce the electric arc simultaneously when closing the normal close branch, second controllable switch K2 connects power B and load, after second controllable switch K2 closed switch, first tapping branch forms stable ground circulation with second tapping branch, reopening first controllable switch K1 to realize no electric arc change power. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is closed and conducted, the second controllable switch K2 is opened, the main switch K0 is closed and conducted again, and finally the first controllable switch K1 is opened, so that no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the power supply further comprises a third tapping branch, the third tapping branch comprises a third controllable switch K3 which is normally open, the third controllable switch K3 is controlled to be connected with the controller, one end of the third controllable switch K3 is electrically connected with the load, and the other end of the third controllable switch K3 is electrically connected with the power supply B;
the controller generates the first conduction signal based on a switching signal of an on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
the controller generates a main disconnection signal based on the on of the first controllable switch K1, and the main switch K0 is disconnected in response to the main disconnection signal;
the controller drives the third controllable switch K3 and the power supply A to be electrically connected to detect that a third pressure difference at two ends of the third controllable switch K3 reaches a preset third preset electrical parameter;
the controller generates a third conduction signal based on the formation of the third voltage difference, the third controllable switch K3 is used for responding to the third conduction signal to conduct the power supply A and the load, and the first tapping branch is bridged with the third tapping branch and forms a second circulation;
the controller generates a first off signal based on the formation of the second loop current, the first controllable switch K1 being opened in response to the first off signal;
The controller drives the first controllable switch K1 and the power supply A to be electrically connected to detect that a fourth pressure difference at two ends of the first controllable switch K1 reaches a preset fourth preset electrical parameter;
the controller generates the first conduction signal based on the formation of the fourth voltage difference, and the first controllable switch K1 responds to the first conduction signal to conduct the power supply A and the load;
the controller generates a main conduction signal based on the conduction of the first controllable switch K1, and the main switch K0 responds to the main conduction signal to conduct the power supply A and the load;
and the controller generates a first off signal based on the on of the main switch K0, the first controllable switch K1 being turned off in response to the first off signal.
Through adopting above-mentioned technical scheme, first controllable switch K1 switches on power B and load, and third controllable switch K3 connects power B and load formation second branch way, and after the closed switch-on of second controllable switch K2, first branch way and second branch way formed stable circulation, and disconnected first controllable switch K1 again to realize no electric arc and change the power. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is closed and conducted, the second controllable switch K2 is opened, the main switch K0 is closed and conducted again, and finally the first controllable switch K1 is opened, so that no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Preferably, the second controllable switch K2 includes a first transition resistor R1 and a first switch Q1 electrically connected in series, an end of the first switch Q1 away from the first transition resistor R1 is electrically connected to the load, and an end of the first transition resistor R1 away from the first switch Q1 is electrically connected to the power source a or the power source B;
the third controllable switch K3 includes a second transition resistor R2 and a second switch Q2 electrically connected in series, where one end of the second switch Q2 away from the second transition resistor R2 is electrically connected with the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected with the power supply a or the power supply B.
By adopting the technical scheme, the first transition resistor R1 and the second transition resistor R2 can provide stable ground voltage difference, the accuracy of electrical parameter identification is improved, and the transition resistor is also a transition resistor for switching between different power supplies, so that faults caused by overlarge line current due to short circuit of the power supplies are avoided.
The application aims at providing a switching device of an on-load tap-changer, which adopts the following technical scheme:
an on-load tap-changer switching device is internally provided with any one of the on-load tap-changer switching circuits.
In summary, the present application includes at least one of the following beneficial technical effects: the first tapping branch can establish an additional conduction loop for the normally closed branch to be disconnected, meanwhile, an electric arc can not be generated when the normally closed branch is closed, the second tapping branch is used for connecting the power supply B with a load, and the power supply A and the load are powered off after stable circulation can be realized, so that the power supply can be replaced without the electric arc; when the first tapping branch is connected between the power supply B and the load, the first tapping branch is conducted, the second tapping branch is disconnected, the normally closed branch is conducted, the first tapping branch is disconnected finally, no arc exists in the action process, the possibility of outage during the action of the on-load tapping switch is reduced, and the stability of the power supply during the action of the on-load tapping switch is improved.
Drawings
FIG. 1 is a circuit diagram of a normally closed branch on, a first tap branch off, a second tap branch off, and a third tap branch off in an on-load tap changer;
FIG. 2 is a circuit diagram of a normally closed branch open, a first tap branch on, a second tap branch open, and a third tap branch open in an on-load tap changer;
fig. 3 is a circuit diagram of a second tap changer connected to a power supply B;
FIG. 4 is a circuit diagram of a second tap changer switching on a power supply B and a load;
fig. 5 is a circuit diagram of a first tap leg open in an on-load tap changer;
fig. 6 is a circuit diagram of a first tap changer connected to a power supply B;
fig. 7 is a circuit diagram of a first tap changer in an on-load tap changer for switching on a power supply B and a load;
fig. 8 is a circuit diagram of a second tap changer with a second tap leg open;
fig. 9 is a circuit diagram of a normally closed branch conducting in an on-load tap changer;
fig. 10 is a circuit diagram of a first tap leg disconnection in an on-load tap changer.
Reference numerals: 1. a normally closed branch; 2. a first tap branch; 3. a second branching branch; 4. and a third tapping branch.
Detailed Description
The application is described in further detail below with reference to fig. 1-10.
The embodiment of the application discloses a switching method of an on-load tap-changer.
Referring to fig. 1 and 2, a method for switching an on-load tap-changer includes the following steps:
the method comprises the steps of establishing a first tapping branch 2 based on a normally closed branch 1 of a power supply A and a load, connecting the first tapping branch 2 with the normally closed branch 1 in parallel, and conducting the power supply A and the load. The normally closed branch circuit 1 enables the load to obtain the power supply of the power supply A, the first tapping branch circuit 2 is connected with the normally closed branch circuit 1 in parallel, the load can also obtain the power supply of the power supply A through the first tapping branch circuit 2, the normally closed branch circuit 1 can not generate an electric arc when being disconnected, and the disconnection of the normally closed branch circuit 1 can not influence the power supply of the load.
As shown in fig. 2 and 3, the normally closed branch 1 is opened, and a second branch 3 is established, and the second branch 3 is electrically connected between the power source B and the load. The second branch 3 provides a basis for the load to obtain a power supply from the power source B, and the voltage across the second branch 3 may be the voltage difference between the power source a and the power source B.
As shown in fig. 3 and 4, the second branch 3 conducts the power supply B and the load based on the detection of the preset first preset electrical parameter in the second branch 3. The first preset electrical parameter is a voltage difference between the power source a and the power source B, or may be a range value where the voltage difference between the power source a and the power source B is located, and if the voltage difference between two ends of the second branch 3 reaches the voltage difference between the power source a and the power source B or is in the range value where the voltage difference between the power source a and the power source B is located, it represents that the connection between the power source B and the load of the second branch 3 is stable.
Based on the detection of a preset second preset electrical parameter after bridging the first tapping branch 2 and the second tapping branch 3, the first tapping branch 2 is disconnected, the first tapping branch 2 is electrically connected between the power supply B and the load, and the normally closed branch 1 is electrically connected between the power supply B and the load. The second branching branch 3 is conducted so that bridging is realized between the first branching branch 2 and the second branching branch 3, and a first circulation is generated. A current transformer is arranged between the first tapping branch 2 and the load, and a current transformer is arranged between the second tapping branch 3 and the load, and if the values on the two current transformers accord with the preset expected values, the current transformers represent the first circulation forming and exist stably.
As shown in fig. 5 and 6, the first tapping branch 2 is disconnected based on the stable first circulation, and the load is connected to the power supply B, so that the power supply B provides power for the load. After the first tapping branch 2 is disconnected, the pressure difference between two ends of the first tapping branch 2 is the pressure difference between two ends of the second tapping branch 3.
As shown in fig. 7 and 8, based on the detection of the preset third preset electrical parameter in the first tapping branch 2, the first tapping branch 2 conducts the power supply B with the load, disconnects the second tapping branch 3, conducts the normally closed branch 1, and disconnects the first tapping branch 2. When the differential pressure of the two ends of the first tapping branch 2 is the differential pressure of the two ends of the second tapping branch 3 stably, the first tapping branch 2 is conducted with the power supply B and the load again, the conducting process of the first tapping branch 2 is free from electric arcs due to the conducting state of the second tapping branch 3, and the power supply B supplies power to the load simultaneously with the second tapping branch 3 after the first tapping branch 2 is conducted. As shown in fig. 9 and 10, the second branch 3 is disconnected and the normally closed branch 1 is conducted, and no arc exists in the process of disconnecting the second branch 3 and the process of conducting the normally closed branch 1; finally, the first tapping branch 2 is disconnected, and no arc exists in the process of disconnecting the first tapping branch 2. The power supply switching without arc and load without power off is realized.
If the load needs to be switched from the power supply B to the power supply A, the following steps are executed:
the first tapping branch 2 switches on the power supply B and the load based on the normally closed branch 1 which switches on the power supply B and the load. The normally closed branch circuit 1 enables the load to obtain the power supply of the power supply B, the first tapping branch circuit 2 is connected with the normally closed branch circuit 1 in parallel, the load can also obtain the power supply of the power supply B through the first tapping branch circuit 2, an electric arc can not be generated when the normally closed branch circuit 1 is disconnected, and the disconnection of the normally closed branch circuit 1 can not influence the power supply of the load.
The normally closed branch 1 is opened and a third tapping branch 4 is established, the third tapping branch 4 being electrically connected between the power supply a and the load. The third tap leg 4 provides for the load to derive a power supply from supply a, at which point the voltage across the third tap leg 4 may be the voltage difference between supply a and supply B.
Based on the detection of a preset fourth preset electrical parameter in the third tap branch 4, the third tap branch 4 switches on the power supply a with the load. The fourth preset electrical parameter is a voltage difference between the power source B and the power source a, or may be a range value where the voltage difference between the power source B and the power source a is located, and if the voltage difference between the two ends of the third tapping branch 4 reaches the voltage difference between the power source B and the power source a or is in the range value where the voltage difference between the power source B and the power source a is located, it represents that the connection between the power source a and the load of the second tapping branch 3 is stable.
Based on the detection of a preset fifth preset electrical parameter after bridging the first tapping branch 2 and the third tapping branch 4, the first tapping branch 2 is disconnected, the first tapping branch 2 is electrically connected between the power supply a and the load, and the normally closed branch 1 is electrically connected between the power supply a and the load. The third tapping branch 4 is conducted such that bridging between the first tapping branch 2 and the third tapping branch 4 is achieved, resulting in a second circulating current. A current transformer is arranged between the first tapping branch 2 and the load, and a current transformer is arranged between the third tapping branch 4 and the load, and if the values on the two current transformers meet the preset expected values, the second current transformer represents the second circulation forming and exists stably. Based on the stable second circulation, the first tapping branch 2 is disconnected, and the load is connected to the power supply a, so that the power supply a supplies power to the load. After the first tapping branch 2 is disconnected, the pressure difference between the two ends of the first tapping branch 2 is the pressure difference between the two ends of the third tapping branch 4.
And, based on the detection of a preset sixth preset electrical parameter in the first tapping branch 2, the first tapping branch 2 switches on the power supply B and the load, then switches off the third tapping branch 4, switches on the normally closed branch 1, and then switches off the first tapping branch 2. When the differential pressure of the two ends of the first tapping branch 2 is the differential pressure of the two ends of the third tapping branch 4 stably, the first tapping branch 2 is conducted with the power supply A and the load again, the conducting process of the first tapping branch 2 is free from electric arcs due to the conducting state of the third tapping branch 4, and the power supply A supplies power to the load simultaneously with the third tapping branch 4 after the first tapping branch 2 is conducted. Then the third tapping branch 4 is disconnected with the normally closed branch 1, and no arc exists in the process of disconnecting the third tapping branch 4 and the process of conducting the normally closed branch 1; finally, the first tapping branch 2 is disconnected, and no arc exists in the process of disconnecting the first tapping branch 2. The power supply switching without arc and load without power off is realized.
The embodiment of the application also discloses an on-load tap-changer switching circuit which comprises a normally closed branch circuit 1, a first tap-changer branch circuit 2, a second tap-changer branch circuit 3, a third tap-changer branch circuit 4 and a controller. The normally closed branch 1 comprises a main switch K0, and the main switch K0 may be an electric switch, a mechanical switch or a mechanical switch with an electric actuator. The first tapping branch 2 comprises a first controllable switch K1 which is normally open, the second tapping branch 3 comprises a second controllable switch K2 which is normally open, and the third tapping branch 4 comprises a third controllable switch K3 which is normally open. The controller is in control connection with the main switch K0, the first controllable switch K1 and the second controllable switch K2.
The second controllable switch K2 comprises a first transition resistor R1 and a normally open first switch Q1 which are electrically connected in series, and the third controllable switch K3 comprises a second transition resistor R2 and a normally open second switch Q2 which are electrically connected in series. The first transition resistor R1 and the second transition resistor R2 can provide stable ground voltage difference, improve the accuracy of electrical parameter identification, are transition resistors converted between different power supplies, and avoid faults caused by overlarge line current due to short circuit of the power supplies.
The first controllable switch K1 is connected with the main switch K0 in parallel, the first controllable switch K1, the second controllable switch K2 and the main switch K0 are electrically connected to a load, and the main switch K0 conducts the power supply A and the load. The third controllable switch K3 is controlled to be connected to the controller, one end of the third controllable switch K3 is electrically connected to the load, and the other end of the third controllable switch K3 is electrically connected to the power supply B. The first controllable switch K1, the first switch Q1, and the second switch Q2 may be power switches such as thyristors.
And one ends of the first tapping branch 2, the second tapping branch 3 and the third tapping branch 4, which are close to the resistor, are electrically connected with a current transformer, and the current transformer is electrically connected with a controller and sends a current signal to the controller.
When the load needs to be switched from the power supply A to the power supply B, the controller generates a first conduction signal based on the switching signal of the on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load. The switching signal can be sent out through an upper computer electrically connected with the controller or through an input device electrically connected with the controller, and the input device can be a button, a keyboard, a mouse, a touch screen or the like.
The controller generates a main disconnect signal based on the conduction of the first tapping branch 2, the main switch K0 opening the normally closed branch 1 in response to the main disconnect signal.
The controller drives one end of the second controllable switch K2 far away from the load and the power supply B to be electrically connected to the first voltage difference of two ends of the second controllable switch K2.
The controller generates a second conduction signal based on the first voltage difference reaching the value of the first preset electrical parameter, the second controllable switch K2 is used for responding to the second conduction signal to conduct the power supply B and the load, and the first tapping branch 2 and the second tapping branch 3 are bridged to form a first circulation.
The controller generates a first off signal based on the first circulating current reaching a value of a second preset electrical parameter, the first controllable switch K1 being opened in response to the first off signal.
The controller drives one end of the first controllable switch K1 far away from the load and the power supply B to be electrically connected to the second differential pressure of the two ends of the first controllable switch K1 detected, and one end of the normally closed branch 1 far away from the load is connected to the power supply B.
The controller generates a first conduction signal based on the second voltage difference reaching a value of a third preset electrical parameter, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load.
The controller generates a second opening signal based on the conduction of the first controllable switch K1, and the second controllable switch K2 opens the second tap leg 3 in response to the second opening signal.
The controller generates a main conduction signal based on the disconnection of the second branch 3, and the main switch K0 responds to the main conduction signal to conduct the power supply B and the load; the method comprises the steps of,
the controller generates a first off signal based on the conduction of the main switch K0, and the first controllable switch K1 is turned off in response to the first off signal.
When the load needs to be switched from the power supply B to the power supply A, the controller generates a first conduction signal based on the switching signal of the on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load.
The controller generates a main off signal based on the on of the first controllable switch K1, and the main switch K0 is turned off in response to the main off signal.
The controller drives the third controllable switch K3 and the power supply A to be electrically connected to detect that a third pressure difference between two ends of the third controllable switch K3 reaches a preset third preset electrical parameter.
The controller generates a third conduction signal based on the formation of a third voltage difference, the third controllable switch K3 turns on the power supply a and the load in response to the third conduction signal, and the first tapping branch 2 and the third tapping branch 4 are bridged and form a second circulation.
The controller generates a first off signal based on the formation of the second loop current, and the first controllable switch K1 is turned off in response to the first off signal.
The controller drives the first controllable switch K1 and the power supply A to be electrically connected to detect that a fourth voltage difference between two ends of the first controllable switch K1 reaches a preset fourth preset electrical parameter.
The controller generates a first conduction signal based on the formation of the fourth voltage difference, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load.
The controller generates a main conduction signal based on the conduction of the first controllable switch K1, and the main switch K0 turns on the power supply a and the load in response to the main conduction signal.
And the controller generates a first off signal based on the on of the main switch K0, the first controllable switch K1 being turned off in response to the first off signal.
The embodiment of the application also discloses a switching device of the on-load tap-changer, wherein any one of the switching circuits of the on-load tap-changer is arranged inside the switching device.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (9)

1. The switching method of the on-load tap-changer is characterized by comprising the following steps of: the method comprises the following steps:
establishing a first tapping branch circuit (2) based on a normally closed branch circuit (1) for conducting a power supply A and a load, wherein the first tapping branch circuit (2) is connected with the normally closed branch circuit (1) in parallel, and conducting the power supply A and the load;
disconnecting the normally closed branch (1) and establishing a second branching branch (3), the second branching branch (3) being electrically connected between a power supply B and the load;
based on the detection of a preset first preset electrical parameter in the second branch (3), the second branch (3) conducts the power supply B and the load; the first preset electrical parameter is a pressure difference between the power supply A and the power supply B, or a range value where the pressure difference between the power supply A and the power supply B is located;
Disconnecting the first tapping branch (2), electrically connecting the first tapping branch (2) between the power supply B and the load, and electrically connecting the normally closed branch (1) between the power supply B and the load, based on a detection of a preset second preset electrical parameter after bridging the first tapping branch (2) with the second tapping branch (3); the second preset electrical parameter is a pressure difference between the first tapping branch (2) and the second tapping branch (3), or a range value of the pressure difference between the first tapping branch (2) and the second tapping branch (3);
and based on the detection of a preset third preset electrical parameter in the first tapping branch (2), the first tapping branch (2) switches on the power supply B and the load, then switches off the second tapping branch (3), switches on the normally closed branch (1), and then switches off the first tapping branch (2); the third preset electrical parameter is a pressure difference between two ends of the second branch circuit (3) or a range value of the pressure difference between two ends of the second branch circuit (3);
-said first tapping branch (2) switches on a power supply B with said load based on said normally closed branch (1) switching on said power supply B with said load;
-disconnecting the normally closed branch (1) and establishing a third tapping branch (4), the third tapping branch (4) being electrically connected between the power supply a and the load;
based on the detection of a fourth preset electrical parameter in the third tapping branch (4), the third tapping branch (4) switches on the power supply a and the load; the fourth preset electrical parameter is a pressure difference between the power supply B and the power supply a, or a range value where the pressure difference between the power supply B and the power supply a is located;
disconnecting the first tapping branch (2), electrically connecting the first tapping branch (2) between the power supply a and the load, and electrically connecting the normally closed branch (1) between the power supply a and the load, based on a fifth preset electrical parameter detected after the first tapping branch (2) and the third tapping branch (4) are bridged; the second preset electrical parameter is a pressure difference between the first tapping branch (2) and the third tapping branch (4), or a range value of the pressure difference between the first tapping branch (2) and the third tapping branch (4);
And based on a preset sixth preset electrical parameter detected in the first tapping branch (2), the first tapping branch (2) switches on the power supply B and the load, then switches off the third tapping branch (4), switches on the normally closed branch (1), and then switches off the first tapping branch (2); the third preset electrical parameter is a pressure difference between two ends of the third tapping branch (4) or a range value of the pressure difference between two ends of the third tapping branch (4).
2. The method for switching an on-load tap changer of claim 1, wherein: the normally closed branch circuit (1) comprises a normally closed main switch K0, the first tapping branch circuit (2) comprises a normally open first controllable switch K1, the second tapping branch circuit (3) comprises a normally open second controllable switch K2, the first controllable switch K1 is connected with the main switch K0 in parallel, and the first controllable switch K1, the second controllable switch K2 and the main switch K0 are electrically connected to the load; the main switch K0 conducts the power supply A and the load;
the method comprises the following steps:
generating a first conduction signal based on a switching signal of an on-load tap-changer, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
Generating a main disconnect signal based on the conduction of the first tapping branch (2), the main switch K0 opening the normally closed branch (1) in response to the main disconnect signal;
driving one end of the second controllable switch K2 far away from the load and the power supply B to be electrically connected to detect a first voltage difference across the second controllable switch K2;
generating a second conduction signal based on the first voltage difference reaching the value of the first preset electrical parameter, wherein the second controllable switch K2 is used for responding to the second conduction signal to conduct the power supply B and the load, and the first tapping branch (2) is bridged with the second tapping branch (3) and forms a first circulating current;
generating a first opening signal based on the first circulating current reaching a value of the second preset electrical parameter, the first controllable switch K1 being opened in response to the first opening signal;
driving one end of the first controllable switch K1 far away from the load and the power supply B to be electrically connected to detect a second pressure difference between two ends of the first controllable switch K1, wherein one end of the normally closed branch circuit (1) far away from the load is connected to the power supply B;
generating the first conduction signal based on the second voltage difference reaching the value of the third preset electrical parameter, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
Generating a second opening signal based on the conduction of the first controllable switch K1, the second controllable switch K2 opening the second tap leg (3) in response to the second opening signal;
generating a main conduction signal based on the disconnection of the second tapping branch (3), the main switch K0 being responsive to the main conduction signal to conduct the power supply B with the load; the method comprises the steps of,
the first off signal is generated based on the conduction of the main switch K0, and the first controllable switch K1 is turned off in response to the first off signal.
3. The method for switching an on-load tap changer of claim 2, wherein: the method is further based on a third tapping branch (4), the third tapping branch (4) comprising a third controllable switch K3 being normally open, one end of the third controllable switch K3 being electrically connected to the load and the other end being electrically connected to the power supply B, the method further comprising the steps of:
generating the first conduction signal based on a switching signal of an on-load tap-changer, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
generating a main off signal based on the turning on of the first controllable switch K1, the main switch K0 being turned off in response to the main off signal;
Driving the third controllable switch K3 and the power supply A to be electrically connected to detect that a third pressure difference at two ends of the third controllable switch K3 reaches a preset third preset electrical parameter;
generating a third conduction signal based on the formation of the third voltage difference, wherein the third controllable switch K3 is used for responding to the third conduction signal to conduct the power supply A and the load, and the first tapping branch (2) is bridged with the third tapping branch (4) and forms a second circulation;
generating a first off signal based on the formation of the second circulating current, the first controllable switch K1 being opened in response to the first off signal;
driving the first controllable switch K1 and the power supply A to be electrically connected to detect that a fourth pressure difference at two ends of the first controllable switch K1 reaches a preset fourth preset electrical parameter;
generating the first conduction signal based on the formation of the fourth voltage difference, wherein the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
generating a main conduction signal based on the conduction of the first controllable switch K1, wherein the main switch K0 is used for responding to the main conduction signal to conduct the power supply A and the load;
and generating a first off signal based on the turning on of the main switch K0, the first controllable switch K1 being turned off in response to the first off signal.
4. A method of switching an on-load tap changer according to claim 3, wherein: the second controllable switch K2 includes a first transition resistor R1 and a first switch Q1 electrically connected in series, one end of the first switch Q1 away from the first transition resistor R1 is electrically connected with the load, and one end of the first transition resistor R1 away from the first switch Q1 is electrically connected with the power supply a or the power supply B;
the third controllable switch K3 includes a second transition resistor R2 and a second switch Q2 electrically connected in series, where one end of the second switch Q2 away from the second transition resistor R2 is electrically connected with the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected with the power supply a or the power supply B.
5. The method for switching an on-load tap changer of claim 2, wherein: after the first pressure difference reaches the value of the first preset electrical parameter for the first time, if the value of the first preset electrical parameter is continuously reached within the preset time, executing the next step based on the first pressure difference reaching the value of the first preset electrical parameter.
6. An on-load tap-changer switching circuit applying an on-load tap-changer switching method according to any one of claims 1-5, characterized in that: the system comprises a normally closed branch circuit (1), a first tapping branch circuit (2) and a second tapping branch circuit (3), wherein the normally closed branch circuit (1) comprises a normally closed main switch K0, the first tapping branch circuit (2) comprises a normally open first controllable switch K1, the second tapping branch circuit (3) comprises a normally open second controllable switch K2, the first controllable switch K1 is connected with the main switch K0 in parallel, and the first controllable switch K1, the second controllable switch K2 and the main switch K0 are electrically connected to a load; the main switch K0 conducts the power supply A and the load;
The controller is in control connection with the main switch K0, the first controllable switch K1 and the second controllable switch K2;
the controller generates a first conduction signal based on a switching signal of an on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply A and the load;
the controller generates a main disconnect signal based on the conduction of the first tapping branch (2), the main switch K0 opening the normally closed branch (1) in response to the main disconnect signal;
the controller drives one end of the second controllable switch K2 far away from the load to be electrically connected with the power supply B until a first pressure difference between two ends of the second controllable switch K2 is detected;
the controller generates a second conduction signal based on the first voltage difference reaching the value of the first preset electrical parameter, the second controllable switch K2 is used for responding to the second conduction signal to conduct the power supply B and the load, and the first tapping branch (2) is bridged with the second tapping branch (3) and forms a first circulating current;
the controller generates a first off signal based on the first circulating current reaching a value of the second preset electrical parameter, the first controllable switch K1 being opened in response to the first off signal;
The controller drives one end of the first controllable switch K1, which is far away from the load, to be electrically connected with the power supply B until a second pressure difference between two ends of the first controllable switch K1 is detected, and one end of the normally closed branch (1), which is far away from the load, is connected with the power supply B;
the controller generates the first conduction signal based on the second voltage difference reaching a value of a third preset electrical parameter, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
the controller generates a second opening signal based on the conduction of the first controllable switch K1, the second controllable switch K2 opening the second tap leg (3) in response to the second opening signal;
the controller generates a main conduction signal based on the disconnection of the second branching branch (3), and the main switch K0 is used for responding to the main conduction signal to conduct the power supply B and the load; the method comprises the steps of,
the controller generates the first off signal based on the conduction of the main switch K0, and the first controllable switch K1 is turned off in response to the first off signal.
7. The on-load tap-changer switching circuit of claim 6, wherein: the system further comprises a third tapping branch circuit (4), wherein the third tapping branch circuit (4) comprises a third controllable switch K3 which is normally open, the third controllable switch K3 is controlled to be connected with the controller, one end of the third controllable switch K3 is electrically connected with the load, and the other end of the third controllable switch K3 is electrically connected with the power supply B;
The controller generates the first conduction signal based on a switching signal of an on-load tap-changer, and the first controllable switch K1 is used for responding to the first conduction signal to conduct the power supply B and the load;
the controller generates a main disconnection signal based on the on of the first controllable switch K1, and the main switch K0 is disconnected in response to the main disconnection signal;
the controller drives the third controllable switch K3 to be electrically connected with the power supply A until a third pressure difference at two ends of the third controllable switch K3 is detected to reach a preset third preset electrical parameter;
the controller generates a third conduction signal based on the formation of the third voltage difference, the third controllable switch K3 is used for responding to the third conduction signal to conduct the power supply A and the load, and the first tapping branch (2) is bridged with the third tapping branch (4) and forms a second circulation;
the controller generates a first off signal based on the formation of the second loop current, the first controllable switch K1 being opened in response to the first off signal;
the controller drives the first controllable switch K1 to be electrically connected with the power supply A until a fourth pressure difference at two ends of the first controllable switch K1 is detected to reach a preset fourth preset electrical parameter;
The controller generates the first conduction signal based on the formation of the fourth voltage difference, and the first controllable switch K1 responds to the first conduction signal to conduct the power supply A and the load;
the controller generates a main conduction signal based on the conduction of the first controllable switch K1, and the main switch K0 responds to the main conduction signal to conduct the power supply A and the load;
and the controller generates a first off signal based on the on of the main switch K0, the first controllable switch K1 being turned off in response to the first off signal.
8. The on-load tap-changer switching circuit of claim 7, wherein: the second controllable switch K2 includes a first transition resistor R1 and a first switch Q1 electrically connected in series, one end of the first switch Q1 away from the first transition resistor R1 is electrically connected with the load, and one end of the first transition resistor R1 away from the first switch Q1 is electrically connected with the power supply a or the power supply B;
the third controllable switch K3 includes a second transition resistor R2 and a second switch Q2 electrically connected in series, where one end of the second switch Q2 away from the second transition resistor R2 is electrically connected with the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected with the power supply a or the power supply B.
9. An on-load tap-changer switching device, characterized in that: an on-load tap-changer switching circuit as claimed in any one of claims 6-8 arranged internally.
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CN205248126U (en) * 2015-12-02 2016-05-18 中国西电电气股份有限公司 Vacuum on -load tap -changer's transition circuit
CN105759200A (en) * 2016-02-18 2016-07-13 中国农业大学 Method for online monitoring of work state of on-load tap-changer and early warning
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CN112670067A (en) * 2020-11-18 2021-04-16 中国电力科学研究院有限公司 Symmetrical vacuum bubble load balancing transition circuit device and control method
CN112908652A (en) * 2021-01-08 2021-06-04 南京南瑞继保电气有限公司 On-load tap-changer and control method thereof
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