CN113889329A - 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
CN113889329A
CN113889329A CN202111125172.8A CN202111125172A CN113889329A CN 113889329 A CN113889329 A CN 113889329A CN 202111125172 A CN202111125172 A CN 202111125172A CN 113889329 A CN113889329 A CN 113889329A
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branch
load
power supply
controllable switch
switch
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CN113889329B (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 method, a circuit and a device for switching an on-load tap-changer, wherein the method comprises the steps of establishing a first tapping branch for conducting a power supply A and a load based on a normally closed branch for conducting the power supply A and the load; disconnecting the normally closed branch circuit and establishing a second tapping branch circuit electrically connected between the power supply B and the load; switching on the second tapping branch based on the first preset electrical parameter detected in the second tapping branch; based on the detection of a second preset parameter after the first shunting branch and the second shunting branch are bridged, disconnecting the first shunting branch, electrically connecting the first shunting branch between a power supply B and a load, and electrically connecting the normally-closed branch between the power supply B and the load; switching on the first tapping branch, switching off the second tapping branch, switching on the normally closed branch and switching off the first tapping branch based on the third preset electrical parameter detected in the first tapping branch; the power-off possibility during power switching can be reduced, and the stability of load power receiving is improved.

Description

On-load tap-changer switching method, circuit and device
Technical Field
The present disclosure relates to the field of power switches, and in particular, to a method, a circuit, and an apparatus for switching an on-load tap changer.
Background
An on-load tap changer refers to a voltage regulating device suitable for operation under transformer excitation or load for changing the tapping connection position of a transformer winding. The basic principle is to realize the switching between taps in the transformer winding under the condition of ensuring that the load current is not interrupted, thereby changing the number of turns of the winding, namely the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation.
The existing on-load tap-changer 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 tap winding connected to one end of a power supply main coil, the polarity switch is used for changing the direction of the tap winding connected with the power supply main coil, the transfer branch connects the tap winding to the other end of the main coil, the gear selection switch and the polarity switch are assembled with a primary side coil of a transformer body in a series connection mode and connected with the transfer branch through a high-voltage bushing, 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 a series connection mode, 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 property of a moving contact and a static contact of the change-over switch caused by arc discharge in the gear shifting process of the conventional on-load tap-changer, reduces the operation risk of the on-load tap-changer and further improves the operation safety, reliability and stability of the whole transformer body.
In the process of implementing the prior art, the inventor finds that at least the following problems exist in the prior art: when the on-load tap-changer acts, a transition branch which is always conducted in the contact state replacement process of the contact is not provided, so that certain power-off possibility still exists when the on-load tap-changer acts, and the 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 method, a circuit and a device for switching an on-load tap-changer, which aim to reduce the possibility of power failure during the action of the on-load tap-changer and improve the stability of a power supply during the action of the on-load tap-changer.
An object of the present application is to provide a method for switching an on-load tap changer, which adopts the following technical scheme:
a switching method of an on-load tap-changer 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 tapping branch, wherein the second tapping branch is electrically connected between a power supply B and the load;
the second tapping branch conducts the power supply B and the load based on the detection of a preset first preset electrical parameter in the second tapping branch;
based on the detection of a preset second preset parameter after the first tapping branch and the second tapping branch are bridged, 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 preset 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, and meanwhile, electric arcs cannot be generated when the normally closed branch is closed; when the first tapping branch is connected between the power supply B and the load, the first tapping branch is switched on, the second tapping branch is switched off, the normally closed branch is switched on, and the first tapping branch is switched off, so that no electric 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 method comprises the steps of:
the first tapping branch conducts the power supply B and the load based on the normally closed branch conducting the power supply B and the load;
disconnecting the normally closed branch and establishing a third tapping branch, wherein the third tapping branch is electrically connected between the power supply A and the load;
the third tapping branch conducts the power supply A and the load based on the detection of a preset fourth preset electrical parameter in the third tapping branch;
based on the detection of a preset fifth preset electrical parameter after the first tapping branch and the third tapping branch are bridged, 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.
Through adopting above-mentioned technical scheme, the third tapping branch road is used for connecting power A and load to let first tapping branch road break off make power B and load outage after can circulating steadily, thereby realize no electric arc and change the power, switch on after first tapping branch road inserts power A and load, the disconnection third tapping branch road, switch on the normal close branch road again, at last break first tapping branch road, let the action process have no electric arc, reduce the possibility of outage when having the tapping switch action, improve the stability of power when having the tapping switch action.
Preferably, the normally closed branch comprises a normally closed main switch K0, the first branch comprises a normally open first controllable switch K1, the second branch comprises a normally open second controllable switch K2, the first controllable switch K1 is connected in parallel with the main switch K0, 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, the first controllable switch K1 conducting the power supply a and the load in response to the first conduction signal;
generating a main open signal based on the conduction of the first tapping branch, the main switch K0 opening the normally closed branch in response to the main open signal;
the end of the second controllable switch K2 remote from the load is driven to electrically connect with the power source B to detect a first voltage difference across the second controllable switch K2;
generating a second turn-on signal based on the first voltage difference reaching the value of the first preset electrical parameter, the second controllable switch K2 turning on the power source B and the load in response to the second turn-on signal, the first and second shunt branches bridging and forming a first circulating current;
generating a first opening signal based on the first circulating current reaching the value of the second preset parameter, the first controllable switch K1 opening in response to the first opening signal;
the end of the first controllable switch K1 far away from the load and the power supply B are driven to be electrically connected to detect a second voltage difference between the two ends of the first controllable switch K1, and the end of the normally closed branch far away from the load is connected to the power supply B;
generating the first on signal based on the second voltage difference reaching the value of the third preset electrical parameter, the first controllable switch K1 switching the power source B and the load on in response to the first on signal;
generating a second open signal based on the turning on of the first controllable switch K1, the second controllable switch K2 opening the second branch in response to the second open signal;
generating a main conducting signal based on the disconnection of the second tapping branch, the main switch K0 responding to the main conducting signal to conduct the power supply B and the load; and the number of the first and second groups,
the first turn-off signal is generated based on the turning on of the main switch K0, and the first controllable switch K1 is turned off in response to the first turn-off signal.
By adopting the technical scheme, the main switch K0 is communicated with the power supply A and the load, the first controllable switch K1 is communicated with the power supply A and the load, the first tapping branch establishes an additional conduction loop for the normally closed branch to be disconnected, meanwhile, an electric arc cannot be generated when the normally closed branch is closed, the second controllable switch K2 is connected with the power supply B and the load, after the second controllable switch K2 is closed and conducted, the first tapping branch and the second tapping branch form a stable circulation, and then the first controllable switch K1 is disconnected, so that the power supply can be replaced without the electric arc. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is turned on, the second controllable switch K2 is turned off, the main switch K0 is turned on, and finally the first controllable switch K1 is turned off, so that no electric arc exists in the action process, the possibility of power failure during the action of the on-load tap-changer is reduced, and the stability of the power supply during the action of the on-load tap-changer is improved.
Preferably, the method is further based on a third tapping branch comprising a third controllable switch K3 being normally open, one end of said third controllable switch K3 being electrically connected to said load and the other end being electrically connected to said power source B, the method further comprising the steps of:
generating the first conduction signal based on a switching signal of an on-load tap changer, the first controllable switch K1 conducting the power supply B and the load in response to the first conduction signal;
generating a main turn-off signal based on the conduction of the first controllable switch K1, the main switch K0 turning off in response to the main turn-off signal;
driving the third controllable switch K3 and the power source a to be electrically connected to detect that a third voltage difference across the third controllable switch K3 reaches a third preset electrical parameter;
generating a third conduction signal based on the formation of the third voltage difference, the third controllable switch K3 switching the power supply a and the load on in response to the third conduction signal, the first branch and the third branch bridging and forming a second circulating current;
generating a first opening signal based on the formation of the second circulating current, the first controllable switch K1 opening in response to the first opening signal;
driving the first controllable switch K1 and the power source a to be electrically connected to detect that a fourth voltage difference across the first controllable switch K1 reaches a preset fourth preset electrical parameter;
generating the first turn-on signal based on the development of the fourth voltage difference, the first controllable switch K1 turning on the power supply a and the load in response to the first turn-on signal;
generating a main conducting signal based on the conduction of the first controllable switch K1, the main switch K0 responding to the main conducting 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.
By adopting the technical scheme, the first controllable switch K1 switches on the power supply B and the load, the third controllable switch K3 is connected with the power supply B and the load to form a second shunt branch, after the second controllable switch K2 is switched on, the first shunt branch and the second shunt branch form stable circulation, and then the first controllable switch K1 is switched off, so that the power supply can be replaced without electric arc. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is turned on, the second controllable switch K2 is turned off, the main switch K0 is turned on, and finally the first controllable switch K1 is turned off, so that no electric arc exists in the action process, the possibility of power failure during the action of the on-load tap-changer is reduced, and the stability of the power supply during the action of the on-load tap-changer is improved.
Preferably, 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 to the load, and one end of the first transition resistor R1 away from the first switch Q1 is electrically connected to 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, one end of the second switch Q2 away from the second transition resistor R2 is electrically connected to the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected to 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 voltage difference, the accuracy of electrical parameter identification is improved, the transition resistors are switched among different power supplies, and the phenomenon that the line current is overlarge to cause a fault due to short circuit of the power supplies is avoided.
Preferably, after the first differential pressure reaches the value of the first preset electrical parameter for the first time, if the first differential pressure continues to reach the value of the first preset electrical parameter within a preset time, the next step is executed based on the first differential pressure reaching the value of the first preset electrical parameter.
By adopting the technical scheme, the subsequent steps are executed after the first pressure difference is stabilized, 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 objective of the present application is to provide an on-load tap changer switching circuit, which adopts the following technical scheme:
an on-load tap changer switching circuit comprising a normally closed branch comprising a normally closed main switch K0, a first tap branch comprising a normally open first controllable switch K1, and a second tap branch comprising a normally open second controllable switch K2, the first controllable switch K1 being connected in parallel with the main switch K0, the first controllable switch K1, the second controllable switch K2 and the main switch K0 all being electrically connected to the load; the main switch K0 conducts the power supply A and the load;
the controller is connected with the main switch K0, the first controllable switch K1 and the second controllable switch K2 in a control mode;
the controller generates a first conducting signal based on a switching signal of an on-load tap changer, and the first controllable switch K1 conducts the power supply A and the load in response to the first conducting signal;
the controller generates a main opening signal based on the conduction of the first tapping branch, and the main switch K0 opens the normally closed branch in response to the main opening 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 with the first voltage difference detected across 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 conducts the power supply B and the load in response to the second conduction signal, and the first branch and the second branch are bridged and form a first circulating current;
the controller generates a first open signal based on the first circulating current reaching the value of the second preset parameter, the first controllable switch K1 being opened in response to the first open 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 voltage difference between the 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 on signal based on the second voltage difference reaching the value of the third preset electrical parameter, the first controllable switch K1 switching the power source B and the load on in response to the first on signal;
the controller generates a second open signal based on the turning on of the first controllable switch K1, the second controllable switch K2 opens the second branch in response to the second open signal;
the controller generates a main conducting signal based on the disconnection of the second tapping branch, and the main switch K0 responds to the main conducting signal to conduct the power supply B and the load; and the number of the first and second groups,
the controller generates the first turn-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 turn-off signal.
By adopting the technical scheme, the main switch K0 is communicated with the power supply A and the load, the first controllable switch K1 is communicated with the power supply A and the load, the first tapping branch establishes an additional conduction loop for the normally closed branch to be disconnected, meanwhile, an electric arc cannot be generated when the normally closed branch is closed, the second controllable switch K2 is connected with the power supply B and the load, after the second controllable switch K2 is closed and conducted, the first tapping branch and the second tapping branch form a stable circulation, and then the first controllable switch K1 is disconnected, so that the power supply can be replaced without the electric arc. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is turned on, the second controllable switch K2 is turned off, the main switch K0 is turned on, and finally the first controllable switch K1 is turned off, so that no electric arc exists in the action process, the possibility of power failure during the action of the on-load tap-changer is reduced, and the stability of the power supply during the action of the on-load tap-changer 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 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 controller generates the first conducting signal based on a switching signal of an on-load tap changer, and the first controllable switch K1 conducts the power supply B and the load in response to the first conducting signal;
the controller generates a main turn-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 turn-off signal;
the controller drives the third controllable switch K3 and the power supply A to be electrically connected to detect that a third voltage difference across the third controllable switch K3 reaches a preset third preset electrical parameter;
the controller generates a third conducting signal based on the formation of the third voltage difference, the third controllable switch K3 conducts the power supply a and the load in response to the third conducting signal, the first branch and the third branch bridge and form a second circulating current;
the controller generates a first opening signal based on the formation of the second circulating current, the first controllable switch K1 opening in response to the first opening 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 the 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, the first controllable switch K1 switching the power supply a and the load on in response to the first conduction signal;
the controller generates a main conducting signal based on the conduction of the first controllable switch K1, and the main switch K0 responds to the main conducting signal to conduct the power supply A and the load;
and the controller generates 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.
By adopting the technical scheme, the first controllable switch K1 switches on the power supply B and the load, the third controllable switch K3 is connected with the power supply B and the load to form a second shunt branch, after the second controllable switch K2 is switched on, the first shunt branch and the second shunt branch form stable circulation, and then the first controllable switch K1 is switched off, so that the power supply can be replaced without electric arc. After the main switch K0 is connected to the power supply B and the load, the first controllable switch K1 is turned on, the second controllable switch K2 is turned off, the main switch K0 is turned on, and finally the first controllable switch K1 is turned off, so that no electric arc exists in the action process, the possibility of power failure during the action of the on-load tap-changer is reduced, and the stability of the power supply during the action of the on-load tap-changer is improved.
Preferably, 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 to the load, and one end of the first transition resistor R1 away from the first switch Q1 is electrically connected to 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, one end of the second switch Q2 away from the second transition resistor R2 is electrically connected to the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected to 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 voltage difference, the accuracy of electrical parameter identification is improved, the transition resistors are switched among different power supplies, and the phenomenon that the line current is overlarge to cause a fault due to short circuit of the power supplies is avoided.
The third objective of the present application is to provide an on-load tap changer switching device, 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, electric arcs cannot be generated when the normally closed branch is closed, and the second tapping branch is used for connecting the power supply B and the load and enabling the power supply A and the load to be powered off after stable circulation is achieved, so that the power supply can be replaced without electric arcs; when the first tapping branch is connected between the power supply B and the load, the first tapping branch is switched on, the second tapping branch is switched off, the normally closed branch is switched on, and the first tapping branch is switched off, so that no electric 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.
Drawings
Fig. 1 is a circuit diagram of a normally closed branch circuit conduction, a first tapping branch circuit disconnection, a second tapping branch circuit disconnection and a third tapping branch circuit disconnection in an on-load tap changer;
fig. 2 is a circuit diagram of a normally closed branch, a first tapping branch being on, a second tapping branch being off and a third tapping branch being off in the on-load tap changer;
fig. 3 is a circuit diagram of a second tap branch of an on-load tap changer connected to a power source B;
fig. 4 is a circuit diagram of a second tap branch of the on-load tap changer conducting power supply B to a load;
fig. 5 is a circuit diagram of a first tap branch of an on-load tap changer being open;
fig. 6 is a circuit diagram of a first tap branch of an on-load tap changer connected to a power source B;
fig. 7 is a circuit diagram of a first tap branch in an on-load tap changer conducting power supply B to a load;
fig. 8 is a circuit diagram of a second tap branch of an on-load tap changer being open;
fig. 9 is a circuit diagram of normally closed leg conduction in an on-load tap changer;
fig. 10 is a circuit diagram of a first tap branch of an on-load tap changer being open.
Reference numerals: 1. a normally closed branch; 2. a first tapping branch; 3. a second tapping branch; 4. and a third branch.
Detailed Description
The present application is described in further detail below with reference to figures 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:
a first tapping branch 2 is established based on a normally closed branch 1 which conducts a power supply A and a load, the first tapping branch 2 is connected with the normally closed branch 1 in parallel, and the power supply A and the load are conducted. Normally closed branch 1 lets the load obtain power supply of power A, and first tapping branch 2 is parallelly connected with normally closed branch 1, and the load also can obtain power supply A's supply through first tapping branch 2, can not produce electric arc when letting normally closed branch 1 break off, can not let normally closed branch 1's disconnection influence the power supply of load yet.
As shown in fig. 2 and 3, the normally closed branch 1 is disconnected, and a second branch 3 is established, and the second branch 3 is electrically connected between the power supply B and the load. The second branch 3 is used for preparing the load to obtain 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 circuit 3 conducts the power supply B and the load based on the first preset electrical parameter detected in the second branch circuit 3. The first preset electrical parameter is a voltage difference between the power supply a and the power supply B, or a range value of the voltage difference between the power supply a and the power supply B, and if the voltage difference between the two ends of the second tapping branch 3 reaches the voltage difference between the power supply a and the power supply B or the range value of the voltage difference between the power supply a and the power supply B, it represents that the second tapping branch 3 is stably connected between the power supply B and the load.
Based on the detection of a preset second preset parameter after the first tapping branch 2 and the second tapping branch 3 are bridged, 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 branch 3 is switched on, so that a bridge connection is established between the first branch 2 and the second branch 3, and a first circulating current is generated. A current transformer is arranged between the first tapping branch 2 and the load, a current transformer is arranged between the second tapping branch 3 and the load, and if the numerical values of the two current transformers meet the preset values, the first circulation molding is represented and exists stably.
As shown in fig. 5 and 6, based on the stable first circulating current, the first branch 2 is disconnected, and the load is connected to the power source B, so that the power source B supplies power to the load. After the first tapping branch 2 is disconnected, the pressure difference across the first tapping branch 2 is the pressure difference across the second tapping branch 3.
As shown in fig. 7 and 8, based on the detection of the 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. When the voltage difference between the two ends of the first tapping branch 2 is stably the voltage difference between the two ends of the second tapping branch 3, the first tapping branch 2 switches on the power supply B and the load, the switching-on process of the first tapping branch 2 has no electric arc due to the switching-on state of the second tapping branch 3, and the first tapping branch 2 and the second tapping branch 3 simultaneously supply power to the load. As shown in fig. 9 and 10, the second shunt branch 3 is disconnected from the normally closed branch 1, and there is no arc in the process of disconnecting the second shunt branch 3 and the process of connecting the normally closed branch 1; finally, the first tapping branch 2 is disconnected, and the process of disconnecting the first tapping branch 2 has no electric arc. And the power supply switching without electric arc and without power interruption of the load is realized.
If the load needs to be switched from the power supply B to the power supply A, the following steps are executed:
based on the normally closed branch 1 for conducting the power supply B and the load, the first tapping branch 2 conducts the power supply B and the load. Normally closed branch 1 lets the load obtain the power supply of power B, and first tapping branch 2 is parallelly connected with normally closed branch 1, and the load also can obtain the supply of power B through first tapping branch 2, can not produce electric arc when letting normally closed branch 1 break off, can not let normally closed branch 1's disconnection influence the power supply of load yet.
And disconnecting the normally closed branch 1 and establishing a third tapping branch 4, wherein the third tapping branch 4 is electrically connected between the power supply A and the load. The third tapping branch 4 is prepared for the load to get the power supply from the power source a, and the voltage across the third tapping branch 4 may be the voltage difference between the power source a and the power source B.
Based on the detection of a fourth predetermined 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 voltage difference between the power supply B and the power supply a, or a range value of the voltage difference between the power supply B and the power supply a, and if the voltage difference between the two ends of the third tapping branch 4 reaches the voltage difference between the power supply B and the power supply a or the range value of the voltage difference between the power supply B and the power supply a, it represents that the second tapping branch 3 is stably connected between the power supply a and the load.
On the basis of the detection of a preset fifth preset electrical parameter after the first tapping branch 2 and the third tapping branch 4 are bridged, 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 switched on, so that a bridge connection is established between the first tapping branch 2 and the third tapping branch 4, and a second circulating current is generated. A current transformer is arranged between the first tapping branch 2 and the load, a current transformer is arranged between the third tapping branch 4 and the load, and if the numerical values of the two current transformers meet the preset values, the second circulation forming is represented and the second circulation forming exists stably. And based on the stable second circulating current, disconnecting the first tapping branch 2, connecting the load into the power supply A, and enabling the power supply A to provide power for the load. After the first tapping branch 2 is disconnected, the pressure difference across the first tapping branch 2 is the pressure difference across 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 across the first tapping branch 2 is stably the differential pressure across the third tapping branch 4, the first tapping branch 2 switches on the power supply a and the load again, the switching on process of the first tapping branch 2 has no arc due to the switching on state of the third tapping branch 4, and the first tapping branch 2 and the third tapping branch 4 simultaneously supply power to the load. Then the third tapping branch 4 is disconnected with the normally closed branch 1, and no electric arc exists in the process of disconnecting the third tapping branch 4 and the process of connecting the normally closed branch 1; finally, the first tapping branch 2 is disconnected, and the process of disconnecting the first tapping branch 2 has no electric arc. And the power supply switching without electric arc and without power interruption of the load is realized.
The embodiment of the application further discloses an on-load tap-changer switching circuit, which comprises a normally closed branch 1, a first tap branch 2, a second tap branch 3, a third tap branch 4 and a controller. The normally closed branch 1 comprises a main switch K0, and the main switch K0 can be an electric switch, a mechanical switch or a mechanical switch with an electric actuator. The first tapping branch 2 comprises a first normally open controllable switch K1, the second tapping branch 3 comprises a second normally open controllable switch K2, and the third tapping branch 4 comprises a third normally open controllable switch K3. 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 includes a first transition resistor R1 and a normally open first switch Q1 electrically connected in series, and the third controllable switch K3 includes a second transition resistor R2 and a normally open second switch Q2 electrically connected in series. The first transition resistor R1 and the second transition resistor R2 can provide stable voltage difference, improve the accuracy of electrical parameter identification, are transition resistors for switching among different power supplies, and avoid the fault caused by overlarge line current due to short circuit of the power supplies.
The first controllable switch K1 is connected in parallel with the main switch K0, the first controllable switch K1, the second controllable switch K2 and the main switch K0 are all electrically connected to the 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, and one end of the third controllable switch K3 is electrically connected to the load, and the other end 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 triacs.
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 the 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 conducting signal based on the switching signal of the on-load tap-changer, and the first controllable switch K1 conducts the power supply A and the load in response to the first conducting signal. The switching signal can be sent by an upper computer electrically connected with the controller, or sent by an input device electrically connected with the controller, wherein the input device can be a button, a keyboard, a mouse or a touch screen.
The controller generates a main opening signal based on the conduction of the first tapping branch 2, and the main switch K0 opens the normally closed branch 1 in response to the main opening signal.
The controller drives the end of the second controllable switch K2 away from the load and the power source B to be electrically connected to detect the first voltage difference across 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 conducts the power supply B and the load in response to the second conduction signal, and the first branch 2 and the second branch 3 bridge and form a first circulating current.
The controller generates a first open signal based on the first circulating current reaching a value of a second preset parameter, the first controllable switch K1 being opened in response to the first open 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 voltage difference at two ends of the first controllable switch K1, 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 turn-on signal based on the second voltage difference reaching a value of a third preset electrical parameter, and the first controllable switch K1 turns on the power supply B and the load in response to the first turn-on signal.
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 tapping branch 3 in response to the second opening signal.
The controller generates a main conducting signal based on the disconnection of the second tapping branch 3, and the main switch K0 responds to the main conducting signal to conduct the power supply B and the load; and the number of the first and second groups,
the controller generates a first turn-off signal based on the turning-on of the main switch K0, and the first controllable switch K1 turns off in response to the first turn-off signal.
When the load needs to be switched from the power supply B to the power supply A, the controller generates a first conducting signal based on the switching signal of the on-load tap-changer, and the first controllable switch K1 conducts the power supply B and the load in response to the first conducting signal.
The controller generates a main off signal based on the conduction 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 the third voltage difference across the third controllable switch K3 reaches a 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 conducts the power supply a and the load in response to the third conduction signal, and the first branch 2 and the third branch 4 bridge and form a second circulating current.
The controller generates a first opening signal based on the formation of the second circulating current, the first controllable switch K1 opening in response to the first opening signal.
The controller drives the first controllable switch K1 and the power source a to be electrically connected to detect that the fourth voltage difference across the first controllable switch K1 reaches a fourth predetermined electrical parameter.
The controller generates a first conduction signal based on the formation of the fourth voltage difference, and the first controllable switch K1 conducts the power supply a and the load in response to the first conduction signal.
The controller generates a main conducting signal based on the conduction of the first controllable switch K1, and the main switch K0 responds to the main conducting signal to conduct the power supply A and the load.
And the controller generates a first turn-off signal based on the turning-on of the main switch K0, and the first controllable switch K1 turns off in response to the first turn-off signal.
The embodiment of the application also discloses an on-load tap-changer switching device, and any one of the on-load tap-changer switching circuits is arranged in the on-load tap-changer switching device.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A switching method of an on-load tap-changer is characterized in that: the method comprises the following steps:
establishing a first tapping branch (2) based on a normally closed branch (1) for conducting a power supply A and a load, wherein the first tapping branch (2) is connected with the normally closed branch (1) in parallel and conducts the power supply A and the load;
disconnecting the normally closed branch (1) and establishing a second tapping branch (3), wherein the second tapping branch (3) is electrically connected between a power supply B and the load;
the second tapping branch (3) conducts the power supply B and the load based on the detection of a preset first preset electrical parameter in the second tapping branch (3);
based on the detection of a preset second preset parameter after the first tapping branch (2) and the second tapping branch (3) are bridged, 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;
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, switches off the second tapping branch (3), switches on the normally closed branch (1), and switches off the first tapping branch (2).
2. The on-load tap changer switching method of claim 1, characterized in that: the method comprises the following steps:
the first tapping branch (2) conducts a power supply B and the load based on the normally closed branch (1) conducting the power supply B and the load;
disconnecting the normally closed branch (1) and establishing a third tapping branch (4), wherein the third tapping branch (4) is electrically connected between the power supply A and the load;
the third tapping branch (4) conducts the power supply a and the load based on the detection of a preset fourth preset electrical parameter in the third tapping branch (4);
based on the detection of a preset fifth preset electrical parameter after the first tapping branch (2) and the third tapping branch (4) are bridged, 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;
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, switches off the third tapping branch (4), switches on the normally closed branch (1), and then switches off the first tapping branch (2).
3. The on-load tap changer switching method of claim 1, characterized in that: the normally closed branch (1) comprises a normally closed main switch K0, the first branch (2) comprises a normally open first controllable switch K1, the second branch (3) comprises a normally open second controllable switch K2, the first controllable switch K1 is connected in parallel with the main switch K0, 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, the first controllable switch K1 conducting the power supply a and the load in response to the first conduction signal;
-generating a main opening 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 opening signal;
the end of the second controllable switch K2 remote from the load is driven to electrically connect with the power source B 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, the second controllable switch K2 switching the power source B and the load on in response to the second conduction signal, the first branch (2) and the second branch (3) bridging and forming a first circulating current;
generating a first opening signal based on the first circulating current reaching the value of the second preset parameter, the first controllable switch K1 opening in response to the first opening signal;
the end of the first controllable switch K1 far away from the load and the power supply B are driven to be electrically connected to detect a second voltage difference between the two ends of the first controllable switch K1, and the end of the normally closed branch (1) far away from the load is connected to the power supply B;
generating the first on signal based on the second voltage difference reaching the value of the third preset electrical parameter, the first controllable switch K1 switching the power source B and the load on in response to the first on signal;
-generating a second opening signal based on the conduction of the first controllable switch K1, the second controllable switch K2 opening the second branch (3) in response to the second opening signal;
generating a main conducting signal based on the disconnection of the second tapping branch (3), the main switch K0 being responsive to the main conducting signal to conduct the power supply B and the load; and the number of the first and second groups,
the first turn-off signal is generated based on the turning on of the main switch K0, and the first controllable switch K1 is turned off in response to the first turn-off signal.
4. An on-load tap changer switching method according to claim 3, characterized in that: the method is further based on a third tapping branch (4), said third tapping branch (4) comprising a third controllable switch K3 being normally open, one end of said third controllable switch K3 being electrically connected to said load and the other end being electrically connected to said power source B, the method further comprising the steps of:
generating the first conduction signal based on a switching signal of an on-load tap changer, the first controllable switch K1 conducting the power supply B and the load in response to the first conduction signal;
generating a main turn-off signal based on the conduction of the first controllable switch K1, the main switch K0 turning off in response to the main turn-off signal;
driving the third controllable switch K3 and the power source a to be electrically connected to detect that a third voltage difference across the third controllable switch K3 reaches a third preset electrical parameter;
generating a third conduction signal based on the formation of the third voltage difference, the third controllable switch K3 switching the power supply a and the load on in response to the third conduction signal, the first branch (2) and the third branch (4) bridging and forming a second circulating current;
generating a first opening signal based on the formation of the second circulating current, the first controllable switch K1 opening in response to the first opening signal;
driving the first controllable switch K1 and the power source a to be electrically connected to detect that a fourth voltage difference across the first controllable switch K1 reaches a preset fourth preset electrical parameter;
generating the first turn-on signal based on the development of the fourth voltage difference, the first controllable switch K1 turning on the power supply a and the load in response to the first turn-on signal;
generating a main conducting signal based on the conduction of the first controllable switch K1, the main switch K0 responding to the main conducting 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.
5. The on-load tap changer switching method of claim 4, characterized in that: the second controllable switch K2 comprises a first transition resistor R1 and a first switch Q1 which are electrically connected in series, one end of the first switch Q1 far away from the first transition resistor R1 is electrically connected with the load, and one end of the first transition resistor R1 far 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, one end of the second switch Q2 away from the second transition resistor R2 is electrically connected to the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected to the power supply a or the power supply B.
6. The on-load tap changer switching method of claim 1, characterized in that: after the first pressure difference reaches the value of the first preset electrical parameter for the first time, if the first pressure difference continuously reaches the value of the first preset electrical parameter within a preset time, executing the next step based on the first pressure difference reaching the value of the first preset electrical parameter.
7. An on-load tap-changer switching circuit, characterized in that: the circuit comprises a normally closed branch (1), a first shunt branch (2) and a second shunt branch (3), wherein the normally closed branch (1) comprises a normally closed main switch K0, the first shunt branch (2) comprises a normally open first controllable switch K1, the second shunt branch (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 all electrically connected to a load; the main switch K0 conducts the power supply A and the load;
the controller is connected with the main switch K0, the first controllable switch K1 and the second controllable switch K2 in a control mode;
the controller generates a first conducting signal based on a switching signal of an on-load tap changer, and the first controllable switch K1 conducts the power supply A and the load in response to the first conducting signal;
the controller generates a main opening 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 opening 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 with the first voltage difference detected across 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 conducts the power supply B and the load in response to the second conduction signal, the first branch (2) and the second branch (3) are bridged and form a first circular current;
the controller generates a first open signal based on the first circulating current reaching the value of the second preset parameter, the first controllable switch K1 being opened in response to the first open 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 with the detected second voltage difference at the two ends of the first controllable switch K1, and one end of the normally closed branch (1) far away from the load is connected with the power supply B;
the controller generates the first on signal based on the second voltage difference reaching a value of a third preset electrical parameter, the first controllable switch K1 switching the power source B and the load on in response to the first on signal;
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 branch (3) in response to the second opening signal;
the controller generates a main conducting signal based on the disconnection of the second tapping branch (3), and the main switch K0 responds to the main conducting signal to conduct the power supply B and the load; and the number of the first and second groups,
the controller generates the first turn-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 turn-off signal.
8. The on-load tap changer switching circuit of claim 7, wherein: the power supply further comprises a third tapping branch (4), the third tapping branch (4) comprises a third controllable switch K3 which is normally open, 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 controller generates the first conducting signal based on a switching signal of an on-load tap changer, and the first controllable switch K1 conducts the power supply B and the load in response to the first conducting signal;
the controller generates a main turn-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 turn-off signal;
the controller drives the third controllable switch K3 and the power supply A to be electrically connected to detect that a third voltage difference across the third controllable switch K3 reaches a preset third preset electrical parameter;
the controller generates a third conducting signal based on the formation of the third voltage difference, the third controllable switch K3 conducts the power supply A and the load in response to the third conducting signal, the first branch (2) and the third branch (4) are bridged and form a second circulating current;
the controller generates a first opening signal based on the formation of the second circulating current, the first controllable switch K1 opening in response to the first opening 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 the 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, the first controllable switch K1 switching the power supply a and the load on in response to the first conduction signal;
the controller generates a main conducting signal based on the conduction of the first controllable switch K1, and the main switch K0 responds to the main conducting signal to conduct the power supply A and the load;
and the controller generates 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.
9. The on-load tap changer switching circuit of claim 8, wherein: the second controllable switch K2 comprises a first transition resistor R1 and a first switch Q1 which are electrically connected in series, one end of the first switch Q1 far away from the first transition resistor R1 is electrically connected with the load, and one end of the first transition resistor R1 far 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, one end of the second switch Q2 away from the second transition resistor R2 is electrically connected to the load, and one end of the second transition resistor R2 away from the second switch Q2 is electrically connected to the power supply a or the power supply B.
10. An on-load tap-changer switching device characterized in that: an on-load tap changer switching circuit according to any of claims 7-9 arranged inside.
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CN112447383A (en) * 2020-10-22 2021-03-05 中国电力科学研究院有限公司 Transition circuit for switching non-multiplexing power electronic on-load tap-changer
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
CN113077980A (en) * 2021-03-22 2021-07-06 全球能源互联网研究院有限公司 On-load tap-changer for high-voltage transmission transformer and control method thereof

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