CN118137480A - Electrical latching circuit for transformer - Google Patents

Abstract

The invention discloses an electric locking circuit of a transformer. The electric locking circuit of the transformer comprises a primary circuit and a secondary circuit; the primary circuit comprises a transformer, wherein the high side and the low side of the transformer are respectively provided with a ground knife and a power supply switch; the secondary circuit comprises at least one electric locking loop of the ground knife and at least one electric locking loop of the power supply switch; the electrically closed circuit comprises control contacts, the state of the control contacts in the electrically closed circuit of the earth blade on the first side being controlled by the state of the power supply switch on the second side, the state of the control contacts in the electrically closed circuit of the power supply switch on the first side being controlled by the state of the earth blade on the second side. According to the technical scheme provided by the embodiment, the primary circuit and the secondary circuit are arranged, and the electric locking loop of the ground knife and the power supply switch is arranged, so that the situations of power transmission of the ground knife with the ground knife and the situation of the ground knife with the ground knife are avoided, the safety problem caused by misoperation can be avoided, and the safety and the stability of an electric system are improved.

Description

Electrical latching circuit for transformer

Technical Field

The embodiment of the invention relates to the technical field of misoperation-preventive locking of power systems, in particular to an electric locking circuit of a transformer.

Background

In the electrical switching operation process of the transformer substation, misoperation conditions such as on-load disconnecting link, power transmission of a ground knife (ground wire) or on-load disconnecting link (ground wire) exist, so that safety accidents are caused, and an anti-misoperation locking device is needed to be pushed out for avoiding the conditions. Currently, the anti-misoperation locking device comprises a microcomputer anti-misoperation system, an electric locking system and an electromagnetic locking system.

The existing high-side ground knife for closing the main transformer can only carry out switching operation according to the sequence of operation tickets by a program key of a microcomputer error prevention system, so that the high-side ground knife is prevented from being closed by the low-side live wire of the main transformer, namely the live wire of the ground knife is prevented from being closed; or the program key of the microcomputer error prevention system can prevent the high side from being electrified to close the low side ground knife. When a program key is in a problem, no other effective means is provided for avoiding the electrified grounding switch on each side of the main transformer, and the high side equipment and the low side equipment of the main transformer are often arranged in different places, so that the connection state of the low side switch cannot be directly observed when an operator needs to close the high side grounding switch, and the connection state of the high side switch cannot be directly observed when the operator needs to close the low side grounding switch.

Therefore, the conventional error prevention means is too single, and when the equipment on each side of the main transformer is operated, whether the other side is in an electrically connected state cannot be judged, and the situation that the ground knife is electrified on each side of the main transformer cannot be avoided, and similarly, the situation that the ground knife (the ground wire) is electrified on each side of the main transformer cannot be avoided.

Disclosure of Invention

The invention provides an electric locking circuit of a transformer, which is used for avoiding the situation that all sides of a main transformer are provided with earthing switches and avoiding the situation that all sides of the main transformer are provided with earthing switches to transmit electricity.

The invention provides an electric locking circuit of a transformer, comprising: a primary circuit and a secondary circuit;

the primary circuit comprises a transformer, wherein the transformer comprises a high side and a low side, the high side and the low side are respectively provided with a ground knife, and the high side and the low side are respectively provided with a power supply switch;

The secondary circuit comprises at least one electric locking loop of the ground knife and at least one electric locking loop of the power supply switch; wherein the electrically closed loop comprises a control contact, the state of the control contact in the electrically closed loop of the earth blade on a first side being controlled by the state of the power switch on a second side, the state of the control contact in the electrically closed loop of the power switch on the first side being controlled by the state of the earth blade on the second side; wherein the first side is the higher side and the second side is the lower side; or the first side is the lower side and the second side is the higher side;

when the control contact of the electric locking loop is disconnected, the corresponding switch state of the electric locking loop is locked to be in a disconnected state, and the switch comprises the ground knife and the power supply switch.

Optionally, the high side is provided with a high side ground knife, and the low side is provided with a low side power supply switch; the secondary circuit comprises a first electric locking loop of the high-side ground knife;

The first electrical latching circuit includes a first docking point for opening when the low side power switch is closed to latch the first electrical latching circuit, the high side ground blade being locked in an open state.

Optionally, the low side further comprises an aerial plug, the first pair of contacts is further configured to open to latch the first electrical latching circuit when the aerial plug is not inserted, and the high side ground blade is locked in an open state.

Optionally, the secondary circuit further comprises a second electrical latching circuit of a low side power switch, the second electrical latching circuit comprising a second docking point for opening when the high side ground blade is closed to latch the second electrical circuit, the low side power switch being locked in an open state.

Optionally, the second electrical latching circuit further comprises an air switch in series with the second docking point.

Optionally, the second electrical latching circuit further comprises an intermediate relay coil, and the electrical latching circuit of the transformer further comprises a low side load control circuit comprising an intermediate relay contact that closes when the intermediate relay coil is energized.

Optionally, two ends of the first electric locking loop are connected to the main transformer interval control cabinet.

Optionally, the lower side is provided with a lower side ground knife, and the higher side is provided with a higher side power supply switch; the secondary circuit comprises a third electric locking loop of the power supply switch at the high side;

The third electrical latching circuit includes a third docking point for opening when the low side ground blade is closed to latch the third electrical latching circuit, the high side power switch being locked in an open state.

Optionally, the secondary circuit further comprises a fourth electrical latching circuit of the low side earth blade, the fourth electrical latching circuit comprising a fourth docking point for opening to latch the fourth electrical circuit when the high side power switch is closed, the low side earth blade being locked in an open state.

Optionally, the primary circuit further includes a bus and a bus switch, the power supply switch of the high side includes a main transformer side switch of the high side switch and a main transformer side switch of the high side switch, the bus switch is electrically connected with the bus, and the main transformer side switch of the high side switch are connected in series between the bus switch and the high side of the transformer.

According to the technical scheme, the primary circuit and the secondary circuit are arranged, the secondary circuit comprises an electric locking circuit of the ground knife and an electric locking circuit of the power supply switch, the electric locking circuits of the ground knife at the high side and the ground knife at the low side are respectively controlled by the states of the power supply switch at the low side and the power supply switch at the high side, and the electric locking circuits of the power supply switch at the high side and the power supply switch at the low side are respectively controlled by the states of the ground knife at the low side and the ground knife at the high side. Through the design of the electric locking loop, the high-side grounding knife and the low-side grounding knife can not be closed when the low-side switch state of the transformer is electrically connected or the high-side switch state of the transformer is electrically connected, and the power transmission with the grounding knife is stopped. In addition, when the low-side grounding knife and the high-side grounding knife of the transformer are in a closed state, the high-side power supply switch and the low-side power supply switch can not be operated to be switched to an electric connection state, and the situation that the grounding knife is electrified is avoided. The circuit short circuit or other safety problems caused by misoperation are effectively avoided, and the safety and stability of the electrical system are improved.

Drawings

Fig. 1 is a schematic structural diagram of an electrical latch circuit of a transformer according to the present invention;

FIG. 2 is a schematic diagram of a first electrical latching circuit for a high side ground blade according to the present invention;

FIG. 3 is a schematic diagram of a second electrical latching circuit of the low side power switch of the present invention;

FIG. 4 is a schematic diagram of a third electrical latching circuit of the variable high side power switch of the present invention;

FIG. 5 is a schematic diagram of a fourth electrical latching circuit for a low side ground blade provided by the present invention;

Fig. 6 is a schematic diagram of a primary circuit of an electrical latching circuit of a transformer according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

Fig. 1 is a schematic structural diagram of an electrical latch circuit of a transformer according to the present invention, and referring to fig. 1, the electrical latch circuit of the transformer includes: a primary circuit 100 and a secondary circuit 200; the primary circuit 100 includes a transformer 1 including a high side and a low side, each of which is provided with a ground blade, and each of which is also provided with a power supply switch; the secondary circuit 200 includes at least one electrically closed loop of the earth blade and at least one electrically closed loop of the power switch; wherein the electric locking loop comprises a control contact, the state of the control contact in the electric locking loop of the first side earth knife is controlled by the state of the power supply switch of the second side, and the state of the control contact in the electric locking loop of the power supply switch of the first side is controlled by the state of the earth knife of the second side; wherein the first side is a higher side and the second side is a lower side; or the first side becomes lower and the second side becomes higher; when the control contact of the electric locking loop is disconnected, the corresponding switch state of the electric locking loop is locked to be in a disconnected state, and the switch comprises a ground knife and a power supply switch.

The primary circuit 100 is used for transmitting high-voltage electric energy or current, so as to ensure the stability and safety of power transmission; the secondary circuit 200 is used for ensuring the normal operation and safety of the electrical equipment through control and protection functions; the transformer 1 is an electric device for converting the magnitude of alternating voltage or current, and is generally composed of a magnetic material (such as an iron core) and a coil; the ground knife is a switch for controlling the connection state of the ground and the circuit; the power supply switch is a switch for controlling the circuit to supply or cutting off the circuit from supplying power; the control contact refers to the contact corresponding to the power switch or the ground knife controlled in the electric locking loop.

For example, the technical solution provided by the present invention will be described in detail by taking the secondary circuit 200 as an example, which includes two electric blocking circuits of the earth blades and two electric blocking circuits of the power supply switches. With continued reference to fig. 1, specifically, in the high side earth blade Q8E electrical latching circuit 201, the state of the first control contact is controlled by the connection state of the second power supply switch G. When the second power supply switch G is in the closed state, the first control contact is opened, the electric locking circuit is locked, the high-side grounding knife Q8E cannot be closed, the low-side live closing of the high-side grounding knife Q8E of the transformer can be avoided, and personnel safety is guaranteed; when the second power supply switch G is in an off state, the first control contact is closed in response to a non-electrically connected state signal of the second power supply switch G, and the electric locking circuit is turned on, so that the high-side earth knife Q8E can be turned on.

In the low side earth blade T0-D electrical latching circuit 202, the state of the second control contact is controlled by the connection state of the first power switch Q0E. When the first power supply switch Q0E is in the closed state, the second control contact is opened, the electric locking circuit is locked, the low-side grounding switch T0-D cannot be closed, the high-side electrified closing of the low-side grounding switch T0-D of the transformer can be avoided, and personal safety is guaranteed; when the first power supply switch Q0E is in an off state, the second control contact is closed in response to the non-electrically connected state signal of the first power supply switch Q0E, and the electrical locking circuit is turned on, so that the low-side ground knives T0-D can be closed.

In the high side power supply switch electrical latching circuit 203, the state of the third control contact is controlled by the position state of the low side ground blades T0-D. When the low-side grounding switch T0-D is in the on state, and the third control contact is opened after responding to the on state, the electric locking circuit is locked, so that the first power supply switch Q0E cannot be switched from the non-electric connection state to the electric connection state, the low-side grounding switch T0-D of the transformer can be prevented from being sent to the high-side power supply, and the personal safety is ensured; when the low-side ground blades T0-D are in the pulled-apart state, the third control contact is closed in response to the state, and the electrically closed loop is turned on, operable to cause the first power supply switch Q0E to switch from the non-electrically connected state to the electrically connected state.

In the low-side power supply switch G electrical latch circuit 204, the state of the fourth control contact is controlled by the position state of the high-side ground blade Q8E. For example, when the high-side grounding knife Q8E is in the on state, and the fourth control contact is opened after responding to the state, the electric locking circuit is locked, so that the second power supply switch G cannot be switched from the non-electric connection state to the electric connection state, the high-side grounding knife Q8E of the transformer can be prevented from sending low-side electricity, and the personal safety is ensured; when the high side earth blade Q8E is in the pulled-off state, the fourth control contact is closed in response to the state, and the electric locking circuit is turned on, so that the second power supply switch G is operable to switch from the non-electric connection state to the electric connection state.

In the technical solution provided in this embodiment, by providing the primary circuit 100 and the secondary circuit 200, the secondary circuit 200 includes an electric blocking circuit of the ground blade and an electric blocking circuit of the power supply switch, the electric blocking circuits of the ground blade on the high side and the low side are controlled by the states of the power supply switch on the low side and the high side, respectively, and the electric blocking circuits of the power supply switch on the high side and the low side are controlled by the states of the ground blade on the low side and the high side, respectively. Through the design of the electric locking loop, the high-side grounding knife and the low-side grounding knife can not be closed when the low-side switch state of the transformer is electrically connected or the high-side switch state of the transformer is electrically connected, and the power transmission with the grounding knife is stopped. In addition, when the low-side grounding knife and the high-side grounding knife of the transformer are in a closed state, the high-side power supply switch and the low-side power supply switch can not be operated to be switched to an electric connection state, and the situation that the grounding knife is electrified is avoided. The circuit short circuit or other safety problems caused by misoperation are effectively avoided, and the safety of an electrical system is improved.

Fig. 2 is a schematic structural diagram of a first electric locking circuit of the high side grounding knife provided by the invention, and with reference to fig. 1 and 2, the high side grounding knife Q8E is provided on the high side, and the low side power supply switch G is provided on the low side; the secondary circuit includes a first electrical latching circuit 401 of the high side ground knife Q8E; the first electric latch circuit 401 includes a first counter point S1, and the first counter point S1 is opened when the low-side power supply switch G is closed to latch the first electric latch circuit 201, and the high-side earth blade Q8E is locked in an opened state.

The state of the first contact point S1 is controlled by the state of the low-side power supply switch G. Illustratively, when the low-side power supply switch G is in a closed state, the first docking point S1 is turned off, so that the situation that the high-side ground knife Q8E is closed when the low-side of the transformer is electrified can be avoided; when the low-side power supply switch G is in the non-electrically connected state, the first pair of contacts S1 is turned on.

Optionally, the low side further comprises an aerial plug, and the first docking point S1 is further configured to be opened when the aerial plug is not inserted to latch the first electrical latching circuit 401, and the high side ground blade Q8E is locked in an opened state.

The aviation plug is used for providing reliable electrical connection, guaranteeing stability and safety of transmitted electric energy, signals or data, and guaranteeing reliability and stability of the electrical connection. The aviation plug can acquire the conduction state information of a switch (comprising a ground knife and a power supply switch) in the primary circuit, wherein the conduction state information comprises conduction and disconnection so as to acquire the power supply state of the primary circuit. In this embodiment, the first pair of contacts S1 is opened to close the first electrical close circuit 401 when the aerial plug is not inserted, so that the high side grounding switch Q8E is locked in the open state, and the situation that the main transformer is electrified to close the high side grounding switch is avoided.

Alternatively, aviation plugs typically employ metal housings, such as aluminum alloys, stainless steel, etc., that provide good mechanical strength and vibration resistance while providing good electrical conductivity and heat dissipation. Or engineering plastics or high temperature insulating materials such as Polyimide (PI), polytetrafluoroethylene (PTFE), etc. are generally used, and the insulator functions to isolate the conductive portion, prevent electrical short-circuit, and provide good insulating properties and high temperature resistance. Or aviation plug contacts typically employ highly conductive metallic materials, such as copper alloys, for making electrical connections and providing low contact resistance and good electrical conductivity. This embodiment is not particularly limited.

Alternatively, the low-side power supply switch G may be connected to the cart-cabinet device. The trolley cabinet is equipment commonly used in a power system, is used for supplying power to the low-voltage side of the main transformer, is used for installing electrical equipment, a switch and a protection device, realizes the control, monitoring and protection functions of the electrical equipment, provides good electrical connection, and ensures the normal operation and safety of the electrical equipment.

Optionally, two ends of the first electrical latching circuit 401 are connected to the main transformer space control cabinet 210.

The main transformer interval control cabinet 210 is used for realizing input and output control of a transformer, and ensuring stable operation and reliability of a power system.

Specifically, when the low-side power supply switch G is in an electrical connection state, or when the aviation plug of the low-side trolley cabinet is not inserted, the first docking point S1 in the first electrical locking circuit 401 is in an off state, so that the first electrical locking circuit 401 is locked, and then the high-side grounding knife Q8E cannot be closed, and the high-side grounding knife Q8E is locked in an off state, thereby preventing the main transformer from being electrified to close the high-side grounding knife Q8E.

When the low-side power supply switch G is in the non-electric connection state, and the aviation plug of the low-side trolley case is inserted, the non-electric connection state of the low-side power supply switch G can be obtained through the aviation plug, the first butt point S1 in the first electric locking circuit 401 is closed in response to the non-electric connection state information, the first electric locking circuit 401 is conducted, and the high-side earth knife Q8E can be closed.

According to the technical scheme provided by the embodiment, the connection state of the low-side power supply switch G can be obtained through the aviation plug, so that the first opposite contact S1 in the first electric locking loop 401 is controlled to be closed or opened, the first electric locking loop 401 is locked or conducted, the high-side grounding knife Q8E can be prevented from being closed when the low side of the transformer is electrified, the occurrence of personal electric shock accidents is effectively prevented, and the safety of personnel is ensured. And the transformer 1 and other related equipment can be protected, the service life of the equipment is prolonged, and the reliability of a power system is improved. Meanwhile, the stable operation of the power system can be maintained, the possibility of faults is reduced, and the power supply quality is improved.

Fig. 3 is a schematic structural diagram of a second electrical blocking circuit of the low-side power switch according to the present invention, and referring to fig. 2 and 3, the secondary circuit 200 further includes a second electrical blocking circuit 402 of the low-side power switch G, where the second electrical blocking circuit 402 includes a second counter point S2, and the second counter point S2 is used to be opened when the high-side ground knife Q8E is closed to block the second electrical circuit 402, and the low-side power switch G is locked in an open state.

The state of the second butt point S2 is controlled by the position state of the high-side earth blade Q8E. For example, when the high-side grounding knife Q8E is in the on state, the second butt joint point S2 is disconnected, so that the condition that the transformer is high and the low-side electricity is fed by the high-side grounding knife can be avoided; when the high-side earth blade Q8E is in the pulled-out state, the second butt point S2 is closed.

Optionally, the second electrical latching circuit 402 further comprises an air switch in series with the second docking point S2.

Wherein the air switch is configured to cause the second electrical latching circuit 402 to communicate with a bus bar L when closed, the bus bar L providing power to the second electrical latching circuit 402.

Optionally, the second electrical latching circuit 402 further comprises an intermediate relay coil JQ1, and the electrical latching circuit of the transformer further comprises a low side load control circuit 205 comprising intermediate relay contacts that close when the intermediate relay coil JQ1 is energized.

The intermediate relay coil JQ1 is a coil wound in a relay, a transformer and other equipment, and when the coil is connected with current, a magnetic field is generated, so that the control or transformation function of the equipment is realized; the intermediate relay contacts are used for closing when the intermediate relay is supplied with current, so that connection or control with other circuits is realized.

Specifically, closing air switch 2DK, bus L supplies second electrical latching circuit 402. When the high side earth knife Q8E is in the on state, the main transformer interval control cabinet 210 obtains the on position information of the high side earth knife Q8E, and in response to the on position information, the second counter contact point S2 in the second electrical blocking circuit 402 is opened, and the intermediate relay coil JQ1 is opened, so that no current passes through the second counter contact point S2, and the intermediate relay contact is opened, and the second electrical blocking circuit 402 is blocked, and at this time, the low side power supply switch G is not operable to switch from the non-electrical connection state to the electrical connection state, thereby preventing the transformer from being high side earth knife to supply low voltage side power.

When the high side earth knife Q8E is in the pulled-open state, the main transformer interval control cabinet 210 obtains the pulled-open position information of the high side earth knife Q8E, so that the second butt joint point S2 in the second electric locking circuit 402 is closed, and the intermediate relay coil JQ1 is closed due to the fact that the second butt joint point S2 is closed and has current passing through, so that the intermediate relay contact is closed after being electrified, the second electric locking circuit 402 is conducted, and the operation switches the low side power supply switch G from the non-electric connection state to the electric connection state.

According to the technical scheme provided by the embodiment, the state of the second butt joint point S2 is controlled by the state of the high-side ground knife Q8E, and the state of the second butt joint point S2 further controls the conduction or locking of the second electric locking loop 402, so that the safety of electric equipment and personnel can be ensured, the electric equipment is effectively protected, and the service life of the equipment is prolonged.

Fig. 4 is a schematic structural diagram of a third electrical locking circuit of the power switch at a high side, and with reference to fig. 1 and 4, on the basis of the above embodiments, the ground blades T0-D at the low side are provided, and the power switch Q0E at the high side is provided; the secondary circuit 200 includes a third electrical latching loop 403 of the high side power switch Q0E; the third electrical latching circuit 403 includes a third pair of contacts S3, the third pair of contacts S3 being configured to open when the low side ground blades T0-D are closed to latch the third electrical latching circuit 403, and the high side power switch Q0E is locked in an open state.

Wherein the state of the third butt point S3 is controlled by the state of the low side earth blades T0-D. Illustratively, when the low-side ground blades T0-D are in the on state, the third contact point S3 is opened, which can prevent the transformer from delivering high-side electricity; when the low-side earth blades T0-D are in the pulled-apart state, the third butt point S3 is closed.

Optionally, both ends of the third electrical latching circuit 403 are connected to the main transformer bay control cabinet 210.

Specifically, when the low-side ground blades T0-D are in the on state, the main transformer interval master control cabinet 210 obtains the on position information of the low-side ground blades T0-D, and in response to the on position information, the third contact point S3 of the third electric locking circuit 403 is opened, and the circuit is locked, and at this time, the high-side power supply switch Q0E is not operable to switch from the non-electric connection state to the electric connection state, so as to stop the low-side ground blade of the transformer from supplying the high-side power.

When the low-side ground knives T0-D are in the pulled-off state, the main transformer interval control cabinet 210 obtains the pulled-off position information of the low-side ground knives T0-D, and in response to the position information, the third docking point S3 of the third electric locking circuit 403 is closed, and the circuit is turned on, so that the high-side power supply switch Q0E is operatively switched from the non-electric connection state to the electric connection state.

According to the technical scheme provided by the embodiment, the state of the third opposite contact point S3 is controlled by the position state of the low-side grounding knife T0-D, and the state of the third opposite contact point S3 further controls the conduction or locking of the third electric locking loop 403, so that the safety of a transformer and other related equipment can be effectively protected, the service life of the transformer is prolonged, and the maintenance and replacement cost is reduced. And the normal operation of the power grid is maintained, the risk of power system faults is reduced, and the power supply quality is improved.

Fig. 5 is a schematic structural diagram of a fourth electrical blocking circuit of a low-side grounding switch according to the present invention, and referring to fig. 4 and 5, the secondary circuit 200 further includes a fourth electrical blocking circuit 404 of a low-side grounding switch according to the above embodiments, and the fourth electrical blocking circuit 404 includes a fourth docking point S4 for being opened when the high-side power supply switch Q0E is closed to block the fourth electrical circuit 404, and the low-side grounding switches T0-D are locked in an opened state.

The state of the fourth contact point S4 is controlled by the state of the high-side power supply switch Q0E. Illustratively, when the high side power supply switch Q0E is in the on state, the fourth contact point S4 is disconnected, so that the situation that the low side ground blades T0-D are closed when the transformer is high side live can be avoided; when the high-side power supply switch Q0E is in the pulled-off state, the fourth junction point S4 is closed.

Optionally, the fourth electrical latching circuit 404 also includes an air switch in series with the fourth docking point S4.

Specifically, closing the air switch 4DK, the bus L supplies the fourth electrical closed loop 404. When the high side switch Q0E is in the electrically connected state, the main transformer interval control cabinet 210 obtains the state information of the high side switch Q0E, and in response to the state information, the fourth junction point S4 in the fourth electrical blocking circuit 404 is opened, the fourth electrical blocking circuit 204 is blocked, and thus the low side ground blade T0-D cannot be closed, the low side ground blade T0-D is locked to be in the off state, and the high side live closing of the transformer is stopped.

When the high side switch Q0E is in the non-electrically connected state, the main transformer interval control cabinet 210 obtains the state information of the high side switch Q0E, and in response to the state information, the fourth junction point S4 in the fourth electrical locking circuit 404 is closed, and the fourth electrical locking circuit 404 is turned on, so that the low side earth knifes T0-D can be closed.

According to the technical scheme provided by the embodiment, the state of the fourth opposite contact point S4 is controlled by the state of the high-side power supply switch Q0E, and the state of the fourth opposite contact point S4 further controls the conduction or locking of the fourth electric locking loop 404, so that the risk of electric shock of personnel can be effectively reduced, the personal safety is ensured, the problems of circuit short circuit, equipment damage and the like can be prevented, and the safety and reliability of a power system are improved.

Fig. 6 is a schematic structural diagram of a primary circuit of an electrical latching circuit of a transformer according to the present invention, referring to fig. 6, the primary circuit 100 of an electrical latching circuit of a transformer further includes a bus and a bus switch, the power supply switch at the high side includes a main switch at the high side Q9E and a main switch at the high side Q0E, the bus switch is electrically connected to the bus, and the main switch at the high side Q0E and the main switch at the high side Q9E are connected in series between the bus switch and the high side of the transformer.

The bus is a main transmission wire in the power system and is used for conveying electric energy from a power plant to a transformer substation or transmitting the electric energy among various devices in the transformer substation; the bus switch is used for controlling the electrical equipment for switching on and off the bus, and can realize the connection and disconnection of the bus; the high-side main switch Q0E is a switching device for controlling the high-side power supply of the transformer, for turning on or off the high-side circuit; the high side switch main change side switch Q9E is a part of the high side main switch for isolating and controlling the switch switching device of the high side circuit.

Optionally, the primary circuit 100 of the electrical latching circuit of the transformer further comprises a high side switch 1, a master side switch Q1E, connected between the bus 1M and the high side master switch Q0E; the high side switch 2 is connected between the bus bar 2M and the high side main switch Q0E.

Specifically, when the main transformer side disconnecting link Q9E of the high side switch, the main transformer side disconnecting link Q1E of the high side switch 1, and the main transformer side disconnecting link Q2E of the high side switch 2 are closed, the high side main switch Q0E is in an electrical connection state; when the main-side switch Q9E, the main-side switch Q1E, and the main-side switch Q2E are pulled, the main-side switch Q0E is in a non-electrically connected state.

Alternatively, the low-side switch G may be a cart cabinet, also having an electrically connected state and a non-electrically connected state.

According to the technical scheme provided by the embodiment, the control of the high-side circuit can be realized, and the high-side main switch Q0E or the low-side switch G can be switched to an electric connection or non-electric connection state when needed, so that the control and management of electric energy transmission are realized. And the management efficiency and the safety of the power system can be improved, and the normal operation of the power system and the safe use of equipment can be ensured.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. An electrical latching circuit for a transformer, comprising: a primary circuit and a secondary circuit;

the primary circuit comprises a transformer, wherein the transformer comprises a high side and a low side, the high side and the low side are respectively provided with a ground knife, and the high side and the low side are respectively provided with a power supply switch;

The secondary circuit comprises at least one electric locking loop of the ground knife and at least one electric locking loop of the power supply switch; wherein the electrically closed loop comprises a control contact, the state of the control contact in the electrically closed loop of the earth blade on a first side being controlled by the state of the power switch on a second side, the state of the control contact in the electrically closed loop of the power switch on the first side being controlled by the state of the earth blade on the second side; wherein the first side is the higher side and the second side is the lower side; or the first side is the lower side and the second side is the higher side;

when the control contact of the electric locking loop is disconnected, the corresponding switch state of the electric locking loop is locked to be in a disconnected state, and the switch comprises the ground knife and the power supply switch.

2. The electrical latching circuit of a transformer according to claim 1, wherein said high side is provided with a high side ground blade and said low side is provided with a low side power switch; the secondary circuit comprises a first electric locking loop of the high-side ground knife;

The first electrical latching circuit includes a first docking point for opening when the low side power switch is closed to latch the first electrical latching circuit, the high side ground blade being locked in an open state.

3. The electrical latching circuit of the transformer of claim 2, wherein the low side further comprises an aerial plug, the first pair of contacts further operable to open to latch the first electrical latching circuit when the aerial plug is not inserted, the high side ground blade being locked in an open state.

4. The electrical latching circuit of the transformer of claim 2, wherein the secondary circuit further comprises a second electrical latching circuit of the low side power switch, the second electrical latching circuit comprising a second pair of contacts for opening to latch the second electrical circuit when the high side ground blade is closed, the low side power switch being locked in an open state.

5. The electrical latching circuit of the transformer of claim 4, wherein the second electrical latching circuit further comprises an air switch in series with the second docking point.

6. The electrical latching circuit of the transformer according to claim 4, wherein said second electrical latching circuit further comprises an intermediate relay coil, said electrical latching circuit of the transformer further comprising a low side load control circuit comprising intermediate relay contacts that close when said intermediate relay coil is energized.

7. The electrical latching circuit of the transformer of claim 2, wherein the two ends of the first electrical latching circuit are connected to a main transformer space control cabinet.

8. The electrical latching circuit of a transformer according to claim 1, wherein said low side is provided with a low side ground blade and said high side is provided with a high side power switch; the secondary circuit comprises a third electric locking loop of the power supply switch at the high side;

The third electrical latching circuit includes a third docking point for opening when the low side ground blade is closed to latch the third electrical latching circuit, the high side power switch being locked in an open state.

9. The electrical latching circuit of the transformer of claim 8, wherein the secondary circuit further comprises a fourth electrical latching circuit of the low side ground blade, the fourth electrical latching circuit comprising a fourth pair of contacts for opening to latch the fourth electrical circuit when the high side power switch is closed, the low side ground blade being locked in an open state.

10. The electrical latching circuit of the transformer of claim 1, wherein the primary circuit further comprises a bus bar and a bus bar switch, the power switch on the high side comprises a main switch on the high side and a main switch on the high side, the bus bar switch is electrically connected to the bus bar, and the main switch on the high side are connected in series between the bus bar switch and the high side of the transformer.