A control method for on-off operation of a phase-splitting magnetic control switch

Abstract

A control method for the opening and closing operation of a phase-separated magnetically controlled switch addresses the issue that the opening and closing operation of a feeder switch involves simultaneous tripping and closing of all three phases. Since the three-phase voltages are not simultaneously zero, arcing can occur in the feeder switch contacts, leading to contact wear and reduced lifespan. This invention provides a control method for the opening and closing operation of the feeder switch by allowing each of the three phases to open and close at its zero-crossing point, thus avoiding contact arcing and preventing contact wear, thereby increasing the lifespan of the feeder switch contacts.

Description

Technical Field

[0001] This invention belongs to the field of magnetic control technology for pole-mounted switches in the power distribution industry, specifically relating to a control method for the opening and closing operation of a phase-by-phase magnetic control switch, which can realize independent operation of the three phases of the magnetic control switch and simultaneous operation of the three phases. Background Technology

[0002] A feeder switch (disconnector) is a switching device that, when in the open position, has a specified insulation distance between its contacts and a clear disconnection mark; when in the closed position, it can carry current under normal circuit conditions and current under abnormal conditions (such as short circuits) for a specified time. Feeder switches (commonly known as "knife switches") generally refer to high-voltage feeder switches, that is, feeder switches with a rated voltage of 1kV and above. They are commonly referred to simply as feeder switches and are the most widely used type of high-voltage switchgear. While their working principle and structure are relatively simple, their large usage and high reliability requirements significantly impact the design, construction, and safe operation of substations and power plants.

[0003] Currently, feeder terminal equipment is a monitoring device installed on the pole next to the feeder switch. It performs remote measurement of the power grid's electrical output, remote signaling of operating conditions, and remote control of functions such as pole-mounted switch operation, battery control, and reset. The feeder switch's opening and closing operation involves simultaneous tripping and closing of all three phases. Because the three-phase voltages are not simultaneously zero, arcing can occur in the switch contacts, causing contact wear and reducing their lifespan. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a control method for the opening and closing operation of a phase-separated magnetically controlled switch. The opening and closing operation of a feeder switch involves simultaneous tripping and closing of all three phases. Since the three-phase voltages are not simultaneously zero, arcing can occur in the feeder switch contacts, causing contact wear and reducing their lifespan. This invention, through a phase-separated magnetically controlled switch opening and closing operation control method, enables the three phases of the feeder switch to open and close at their respective zero-crossing points, avoiding contact arcing and thus preventing contact wear and increasing the lifespan of the feeder switch contacts.

[0005] The present invention employs the following technical solution.

[0006] A control method for the opening and closing operation of a phase-splitting magnetic switch includes:

[0007] The feeder switch control circuit connected to the feeder switch mechanism is a hybrid full-bridge circuit consisting of three left half-bridges and one common right half-bridge.

[0008] The hybrid full-bridge circuit enables the three phases of the feeder switch mechanism to open and close at the zero-crossing point respectively.

[0009] Preferably, the three left half-bridge circuits correspond to phases A, B, and C of the feeder switch mechanism, respectively, forming phase A half-bridge circuit, phase B half-bridge circuit, and phase C half-bridge circuit.

[0010] Preferably, the A-phase half-bridge circuit, the B-phase half-bridge circuit, and the C-phase half-bridge circuit all adopt independent half-bridge circuits. Each independent half-bridge circuit is composed of a complete upper bridge arm and a lower bridge arm connected in series. The upper bridge arm and the lower bridge arm are directly connected in series by a controllable switching device, and the controllable switching device is connected in parallel with a unidirectional diode. The output terminals of the three independent half-bridge circuits are respectively connected to the positive terminals of three single-phase electromagnetic actuators, and the three single-phase electromagnetic actuators form a feeder switch mechanism.

[0011] Preferably, the single-phase electromagnetic actuator is an electrically controlled circuit breaker.

[0012] Preferably, the specific structures of the A-phase half-bridge circuit, the B-phase half-bridge circuit, and the C-phase half-bridge circuit include:

[0013] The controllable switching devices Q1 and Q2 are connected in series to form the A-phase half-bridge circuit, the controllable switching devices Q3 and Q4 are connected in series to form the B-phase half-bridge circuit, and the controllable switching devices Q5 and Q6 are connected in series to form the C-phase half-bridge circuit.

[0014] Diodes D1, D2, D3, D4, D5, and D6, which are unidirectional diodes, are connected in parallel with the drain and source of switch Q1, the drain and source of switch Q2, the drain and source of switch Q3, the drain and source of switch Q4, the drain and source of switch Q5, and the drain and source of switch Q6, respectively.

[0015] The gate of switch Q1 is connected to the control signal of the upper A phase switch, the gate of switch Q2 is connected to the control signal of the lower A phase switch, the gate of switch Q3 is connected to the control signal of the upper B phase switch, the gate of switch Q4 is connected to the control signal of the lower B phase switch, the gate of switch Q5 is connected to the control signal of the upper C phase switch, and the gate of switch Q6 is connected to the control signal of the lower C phase switch.

[0016] The source of switch Q1, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q2, which serves as the positive terminal of phase A electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q3, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q4, which serves as the positive terminal of phase B electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q5, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q6, which serves as the output terminal of the independent half-bridge circuit, which serves as the positive terminal of phase C electromagnetic actuator, which is a single-phase electromagnetic actuator.

[0017] Preferably, the common right half-bridge is composed of a complete upper and lower bridge arm connected in series, the upper and lower bridge arms are directly connected in series by a controllable switching device, and the controllable switching device is connected in parallel with a unidirectional diode; the output terminal of the common right half-bridge is connected in parallel to the negative terminal of three single-phase electromagnetic actuators.

[0018] Preferably, the specific structure of the shared right half-bridge includes:

[0019] Switches Q7 and Q8, which are controllable switching devices, are connected in series to form a common right half-bridge. The source of switch Q7 and the drain of switch Q8, which are the output terminals of the common right half-bridge, are connected to the negative terminals of phase A, phase B, and phase C electromagnetic actuators. Diodes D7 and D8 are connected in parallel with the drain and source of switch Q7 and switch Q8, respectively.

[0020] Preferably, during the zero-crossing opening and closing of the three phases of the feeder switch mechanism using the hybrid full-bridge circuit, when the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on by control signals, and the lower arm of the common right half-bridge is turned on by control signals. The positive current flows through the upper arms of the three left half-bridges to the positive terminals of the three single-phase electromagnetic actuators, and then from the negative terminals of the three single-phase electromagnetic actuators, flows into the negative terminal through the lower arm of the common right half-bridge. The three single-phase electromagnetic actuators simultaneously start to operate under current excitation, thereby driving the feeder switch mechanism to complete the simultaneous operation of phases A, B, and C of the feeder switch mechanism.

[0021] Preferably, when the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the specific operation includes:

[0022] The upper arm switches Q1 of the A-phase half-bridge circuit, Q3 of the B-phase half-bridge circuit, and Q5 of the C-phase half-bridge circuit are turned on by the control signals of the upper A-phase, upper B-phase, and upper C-phase switches, respectively. The lower arm switches Q2 of the A-phase half-bridge circuit, Q4 of the B-phase half-bridge circuit, and Q6 of the C-phase half-bridge circuit are not turned on by the control signals of the lower A-phase, lower B-phase, and lower C-phase switches, respectively. The lower arm switch Q8 of the common right half-bridge is turned on by the control signal of the common right half-bridge lower arm. When the common right half-bridge's upper arm switch Q7 is turned off by the common right half-bridge upper arm control signal, the positive VH+ current flows through the three left half-bridge upper arm switches Q1, Q3, and Q5 to the positive terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively. Then, it flows through the negative terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively, and into the negative terminal via the common right half-bridge switch Q8. The three electromagnetic actuators simultaneously start operating under current excitation, thereby driving the feeder switch mechanism and completing the simultaneous operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

[0023] Preferably, during the zero-crossing opening and closing of the three phases of the feeder switch mechanism using the hybrid full-bridge circuit, when the feeder switch requires the sequential operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on according to the timing requirements through the timing control signal, and the lower arm of the common right half-bridge is turned on through the control signal. The positive current flows through the upper arm of the left half-bridge turned on according to the timing requirements to the positive terminal of the corresponding single-phase electromagnetic actuator, and then from the negative terminal of the corresponding single-phase electromagnetic actuator, flows into the negative terminal through the lower arm of the common right half-bridge. At the same time, the corresponding single-phase electromagnetic actuator starts to operate through current excitation, thereby driving the feeder switch mechanism and completing the sequential operation of phases A, B, and C of the feeder switch mechanism.

[0024] Preferably, when the feeder switch requires the three phases A, B, and C of the feeder switch mechanism to operate in sequence, the upper arm switch Q1 of the A-phase half-bridge circuit, the upper arm switch Q3 of the B-phase half-bridge circuit, and the upper arm switch Q5 of the C-phase half-bridge circuit are respectively turned on by the upper arm control signals of phase A, phase B, and phase C, according to the timing requirements. The lower arm switches Q2 of the A-phase half-bridge circuit, Q4 of the B-phase half-bridge circuit, and Q6 of the C-phase half-bridge circuit are respectively not turned on by the lower arm control signals of phase A, phase B, and phase C, respectively. The lower arm switch of the common right half-bridge is not turned on. Q8 is turned on by the control signal of the lower arm of the common right half bridge, while Q7, the upper arm of the common right half bridge, is not turned on by the control signal of the lower arm of the common right half bridge. The positive VH+ current flows sequentially through the three left half bridge switches Q1, Q3, and Q5 to the positive terminals of the A-phase electromagnetic actuator, B-phase electromagnetic actuator, and C-phase electromagnetic actuator, respectively. Then, it flows from the negative terminals of the A-phase, B-phase, and C-phase electromagnetic actuators to the negative terminal through the switch Q8 of the common right half bridge. The three electromagnetic actuators start to operate simultaneously with current excitation, thereby driving the feeder switch mechanism and completing the sequential operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

[0025] The beneficial effects of this invention are that, compared with the prior art, it enables three-phase feeder switches to achieve zero-crossing operation, extending the switch's service life. Because this invention employs a shared right-half-bridge circuit structure, the number of power components is reduced, achieving system miniaturization and lowering manufacturing costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall principle structure of the control method for the phase-separated magnetic switch opening and closing operation described in this invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0028] like Figure 1 As shown, the method for a remote operation and maintenance intelligent waveform recorder for substation safety according to the present invention includes:

[0029] The feeder switch control circuit connected to the feeder switch mechanism is a hybrid full-bridge circuit consisting of three left half-bridges and one common right half-bridge.

[0030] The hybrid full-bridge circuit enables the three phases of the feeder switch mechanism to open and close at the zero-crossing point respectively.

[0031] In a preferred but non-limiting embodiment of the present invention, the three left half-bridge circuits correspond to the three phases A, B and C of the feeder switch mechanism, respectively, forming the A-phase half-bridge circuit, the B-phase half-bridge circuit and the C-phase half-bridge circuit.

[0032] In a preferred but non-limiting embodiment of the present invention, the A-phase half-bridge circuit, the B-phase half-bridge circuit, and the C-phase half-bridge circuit all adopt independent half-bridge circuits. Each independent half-bridge circuit is composed of a complete upper bridge arm and a lower bridge arm connected in series. The upper bridge arm and the lower bridge arm are directly connected in series by a controllable switching device, and the controllable switching device is connected in parallel with a unidirectional diode. The output terminals of the three independent half-bridge circuits are respectively connected to the positive terminals of three single-phase electromagnetic actuators, and the three single-phase electromagnetic actuators form a feeder switch mechanism.

[0033] In a preferred but non-limiting embodiment of the present invention, the single-phase electromagnetic actuator is an electrically controlled circuit breaker.

[0034] In a preferred but non-limiting embodiment of the present invention, the specific structures of the A-phase half-bridge circuit, the B-phase half-bridge circuit, and the C-phase half-bridge circuit include:

[0035] The controllable switching devices Q1 and Q2 are connected in series to form the A-phase half-bridge circuit, the controllable switching devices Q3 and Q4 are connected in series to form the B-phase half-bridge circuit, and the controllable switching devices Q5 and Q6 are connected in series to form the C-phase half-bridge circuit.

[0036] Diodes D1, D2, D3, D4, D5, and D6, which are unidirectional diodes, are connected in parallel with the drain and source of switch Q1, the drain and source of switch Q2, the drain and source of switch Q3, the drain and source of switch Q4, the drain and source of switch Q5, and the drain and source of switch Q6, respectively.

[0037] The gate of switch Q1 is connected to the control signal of the upper A phase switch, the gate of switch Q2 is connected to the control signal of the lower A phase switch, the gate of switch Q3 is connected to the control signal of the upper B phase switch, the gate of switch Q4 is connected to the control signal of the lower B phase switch, the gate of switch Q5 is connected to the control signal of the upper C phase switch, and the gate of switch Q6 is connected to the control signal of the lower C phase switch.

[0038] The source of switch Q1, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q2, which serves as the positive terminal of phase A electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q3, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q4, which serves as the positive terminal of phase B electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q5, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q6, which serves as the output terminal of the independent half-bridge circuit, which serves as the positive terminal of phase C electromagnetic actuator, which is a single-phase electromagnetic actuator.

[0039] In a preferred but non-limiting embodiment of the present invention, the common right half-bridge is composed of a complete upper and lower bridge arm connected in series, the upper and lower bridge arms are directly connected in series by a controllable switching device, and the controllable switching device is connected in parallel with a unidirectional diode; the output terminal of the common right half-bridge is connected in parallel to the negative terminal of three single-phase electromagnetic actuators.

[0040] In a preferred but non-limiting embodiment of the present invention, the specific structure of the common right half-bridge includes:

[0041] Switches Q7 and Q8, which are controllable switching devices, are connected in series to form a common right half-bridge. The source of switch Q7 and the drain of switch Q8, which are the output terminals of the common right half-bridge, are connected to the negative terminals of phase A, phase B, and phase C electromagnetic actuators. Diodes D7 and D8 are connected in parallel with the drain and source of switch Q7 and switch Q8, respectively.

[0042] In a preferred but non-limiting embodiment of the present invention, during the zero-crossing opening and closing of the three phases of the feeder switch mechanism using a hybrid full-bridge circuit, when the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on by a control signal, and the lower arm of the common right half-bridge is turned on by a control signal; the positive current flows through the upper arms of the three left half-bridges to the positive terminals of the three single-phase electromagnetic actuators, and then from the negative terminals of the three single-phase electromagnetic actuators, flows into the negative terminal through the lower arm of the common right half-bridge; the three single-phase electromagnetic actuators simultaneously start to operate under current excitation, thereby driving the feeder switch mechanism to complete the simultaneous operation of phases A, B, and C of the feeder switch mechanism.

[0043] In a preferred but non-limiting embodiment of the present invention, when the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the specific implementation includes:

[0044] The upper arm switches Q1 of the A-phase half-bridge circuit, Q3 of the B-phase half-bridge circuit, and Q5 of the C-phase half-bridge circuit are turned on by the control signals of the upper A-phase, upper B-phase, and upper C-phase switches, respectively. The lower arm switches Q2 of the A-phase half-bridge circuit, Q4 of the B-phase half-bridge circuit, and Q6 of the C-phase half-bridge circuit are not turned on by the control signals of the lower A-phase, lower B-phase, and lower C-phase switches, respectively. The lower arm switch Q8 of the common right half-bridge is turned on by the control signal of the common right half-bridge lower arm. When the common right half-bridge's upper arm switch Q7 is turned off by the common right half-bridge upper arm control signal, the positive VH+ current flows through the three left half-bridge upper arm switches Q1, Q3, and Q5 to the positive terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively. Then, it flows through the negative terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively, and into the negative terminal via the common right half-bridge switch Q8. The three electromagnetic actuators simultaneously start operating under current excitation, thereby driving the feeder switch mechanism and completing the simultaneous operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

[0045] In a preferred but non-limiting embodiment of the present invention, during the zero-crossing opening and closing of the three phases of the feeder switch mechanism using a hybrid full-bridge circuit, when the feeder switch requires the sequential operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on according to the timing requirements through the timing control signal, and the lower arm of the common right half-bridge is turned on through the control signal. The positive current flows through the upper arm of the left half-bridge turned on according to the timing requirements to the positive terminal of the corresponding single-phase electromagnetic actuator, and then from the negative terminal of the corresponding single-phase electromagnetic actuator, flows into the negative terminal through the lower arm of the common right half-bridge. The corresponding single-phase electromagnetic actuator is simultaneously energized by the current and starts to operate, thereby driving the feeder switch mechanism and completing the sequential operation of phases A, B, and C of the feeder switch mechanism.

[0046] In a preferred but non-limiting embodiment of the present invention, when the feeder switch requires the three phases A, B, and C of the feeder switch mechanism to operate sequentially, the upper arm switch Q1 of the A-phase half-bridge circuit, the upper arm switch Q3 of the B-phase half-bridge circuit, and the upper arm switch Q5 of the C-phase half-bridge circuit are respectively turned on by the upper arm control signals of phase A, B, and C according to the timing requirements. The lower arm switches Q2 of the A-phase half-bridge circuit, Q4 of the B-phase half-bridge circuit, and Q6 of the C-phase half-bridge circuit are respectively not turned on by the lower arm control signals of phase A, B, and C. The common right half-bridge is used as the lower arm switch. The switch Q8 of the bridge arm is turned on by the control signal of the lower arm of the common right half bridge, while the switch Q7 of the upper arm of the common right half bridge is not turned on by the control signal of the lower arm of the common right half bridge. The positive VH+ current flows sequentially through the three switches Q1, Q3, and Q5 of the left half bridge to the positive terminals of the A-phase electromagnetic actuator, the B-phase electromagnetic actuator, and the C-phase electromagnetic actuator, respectively. Then, it flows from the negative terminals of the A-phase electromagnetic actuator, the B-phase electromagnetic actuator, and the C-phase electromagnetic actuator to the negative terminal of the switch Q8 of the common right half bridge. The three electromagnetic actuators start to operate simultaneously with current excitation, thereby driving the feeder switch mechanism and completing the sequential operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

[0047] The beneficial effects of this invention are that, compared with the prior art, it enables three-phase feeder switches to achieve zero-crossing operation, extending the switch's service life. Because this invention employs a shared right-half-bridge circuit structure, the number of power components is reduced, achieving system miniaturization and lowering manufacturing costs.

[0048] This disclosure may be a system, method, and / or computer program product. A computer program product may include a computer-readable backup medium having computer-readable program instructions loaded thereon for causing a processor to achieve various aspects of this disclosure.

[0049] Computer-readable backup media can be a physical circuit capable of maintaining and backing up instructions executed by the circuit. Computer-readable backup media can be—but is not limited to—electrical backup circuits, magnetic backup circuits, optical backup circuits, electromagnetic backup circuits, semiconductor backup circuits, or any suitable combination thereof. Further examples of computer-readable backup media (a non-exhaustive list) include: portable computer disks, hard disks, random access backup devices (RAM), read-only backup devices (ROM), erasable programmable read-only backup devices (EPROM or flash memory), static random access backup devices (SRAM), portable compact disk read-only backup devices (HD-ROM), digital multipurpose disks (DXD), memory sticks, floppy disks, mechanically encoded circuits, punch cards or recessed protrusions such as those with backed-up instructions, or any suitable combination thereof. The computer-readable backup media used herein are not to be interpreted as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (like light pulses through power transmission cables), or electrical signals transmitted through wires.

[0050] The computer-readable program instructions described herein can be downloaded from computer-readable backup media to various computing / processing power lines, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external backup power line. The network can include copper transmission cables, power line transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. Network adapters or network interfaces in each computing / processing power line receive the computer-readable program instructions from the network and forward them to the computer-readable backup media stored in each computing / processing power line.

[0051] The computer program instructions used to execute the operations of this disclosure can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-associative instructions, microcode, firmware instructions, condition-defined values, or source or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Standard A, H++, etc., and conventional procedural programming languages ​​such as the "H" language or similar programming languages. The computer-readable program instructions can be executed entirely on the client computer, partially on the client computer, as a standalone software package, partially on the client computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the client computer via any type of network—including a local area network (LAb) or a wide area network (WAb), or can be connected to an external computer (such as using an Internet service provider to connect via the Internet). In some embodiments, electronic circuits are personalized by employing status values ​​of computer-readable program instructions, such as programmable logic circuits, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), which can execute computer-readable program instructions to achieve the various aspects disclosed herein.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent updates can still be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention. Any modifications or equivalent updates should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control method for the opening and closing operation of a phase-splitting magnetically controlled switch, characterized in that, include: The feeder switch control circuit connected to the feeder switch mechanism is a hybrid full-bridge circuit consisting of three left half-bridges and one common right half-bridge. A hybrid full-bridge circuit enables the three phases of the feeder switch mechanism to open and close at zero-crossing points respectively; The three left half-bridge circuits correspond to phases A, B and C of the feeder switch mechanism, respectively, forming phase A half-bridge circuit, phase B half-bridge circuit and phase C half-bridge circuit; The A-phase half-bridge circuit, B-phase half-bridge circuit, and C-phase half-bridge circuit all use independent half-bridge circuits. Each independent half-bridge circuit is composed of a complete upper bridge arm and a lower bridge arm connected in series. The upper bridge arm and the lower bridge arm are directly connected in series by a controllable switching device, and the controllable switching device is connected in parallel with a unidirectional diode. The output terminals of the three independent half-bridge circuits are respectively connected to the positive terminals of three single-phase electromagnetic actuators, and the three single-phase electromagnetic actuators form a feeder switch mechanism. The common right half-bridge consists of a complete upper and lower bridge arm connected in series. The upper and lower bridge arms are directly connected in series by controllable switching devices, and the controllable switching devices are connected in parallel with unidirectional diodes. The output terminal of the common right half-bridge is connected in parallel to the negative terminal of three single-phase electromagnetic actuators.

2. The control method for the opening and closing operation of the phase-splitting magnetically controlled switch according to claim 1, characterized in that, The single-phase electromagnetic actuator is an electrically controlled circuit breaker.

3. The control method for the opening and closing operation of the phase-separated magnetically controlled switch according to claim 2, characterized in that, The specific structures of the A-phase half-bridge circuit, the B-phase half-bridge circuit, and the C-phase half-bridge circuit include: The controllable switching devices Q1 and Q2 are connected in series to form the A-phase half-bridge circuit, the controllable switching devices Q3 and Q4 are connected in series to form the B-phase half-bridge circuit, and the controllable switching devices Q5 and Q6 are connected in series to form the C-phase half-bridge circuit. Diodes D1, D2, D3, D4, D5, and D6, which are unidirectional diodes, are connected in parallel with the drain and source of switch Q1, the drain and source of switch Q2, the drain and source of switch Q3, the drain and source of switch Q4, the drain and source of switch Q5, and the drain and source of switch Q6, respectively. The gate of switch Q1 is connected to the control signal of the upper A phase switch, the gate of switch Q2 is connected to the control signal of the lower A phase switch, the gate of switch Q3 is connected to the control signal of the upper B phase switch, the gate of switch Q4 is connected to the control signal of the lower B phase switch, the gate of switch Q5 is connected to the control signal of the upper C phase switch, and the gate of switch Q6 is connected to the control signal of the lower C phase switch. The source of switch Q1, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q2, which serves as the positive terminal of phase A electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q3, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q4, which serves as the positive terminal of phase B electromagnetic actuator, which is a single-phase electromagnetic actuator. The source of switch Q5, which serves as the output terminal of the independent half-bridge circuit, is connected to the drain of switch Q6, which serves as the output terminal of the independent half-bridge circuit, which serves as the positive terminal of phase C electromagnetic actuator, which is a single-phase electromagnetic actuator.

4. The control method for the opening and closing operation of the phase-splitting magnetically controlled switch according to claim 3, characterized in that, The specific structure of the shared right half-bridge includes: Switches Q7 and Q8, which are controllable switching devices, are connected in series to form a common right half-bridge. The source of switch Q7 and the drain of switch Q8, which are the output terminals of the common right half-bridge, are connected to the negative terminals of phase A, phase B, and phase C electromagnetic actuators. Diodes D7 and D8 are connected in parallel with the drain and source of switch Q7 and the drain and source of switch Q8, respectively.

5. The control method for the opening and closing operation of the phase-splitting magnetically controlled switch according to claim 4, characterized in that, The hybrid full-bridge circuit enables the three phases of the feeder switch mechanism to open and close at their respective zero-crossing points. When the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on by control signals, and the lower arm of the common right half-bridge is turned on by control signals. The positive current flows through the upper arms of the three left half-bridges to the positive terminals of the three single-phase electromagnetic actuators, and then from the negative terminals of the three single-phase electromagnetic actuators, flows into the negative terminal through the lower arm of the common right half-bridge. The three single-phase electromagnetic actuators are simultaneously energized by current and start to operate, thereby driving the feeder switch mechanism to complete the simultaneous operation of phases A, B, and C of the feeder switch mechanism.

6. The control method for the opening and closing operation of the phase-splitting magnetically controlled switch according to claim 5, characterized in that, When the feeder switch requires the simultaneous operation of phases A, B, and C of the feeder switch mechanism, the specific requirements include: The upper arm switches Q1 of the A-phase half-bridge circuit, Q3 of the B-phase half-bridge circuit, and Q5 of the C-phase half-bridge circuit are turned on by the control signals of the upper arms of the A-phase, B-phase, and C-phase circuits, respectively. The lower arm switches Q2 of the A-phase half-bridge circuit, Q4 of the B-phase half-bridge circuit, and Q6 of the C-phase half-bridge circuit are not turned on by the control signals of the lower arms of the A-phase, B-phase, and C-phase circuits, respectively. The lower arm switch Q8 of the common right half-bridge is turned on by the control signal of the lower arm of the common right half-bridge, and the upper arm switch Q7 of the common right half-bridge is not turned on by the control signal of the upper arm of the common right half-bridge. The positive VH+ current flows through the upper arm switches Q1 of the three left half-bridges. Switches Q3 and Q5 are connected to the positive terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively. Then, the current flows into the negative terminal via the common right half-bridge switch Q8 from the negative terminals of the A-phase, B-phase, and C-phase electromagnetic actuators. The three electromagnetic actuators are simultaneously energized by the current and start operating, thereby driving the feeder switch mechanism to complete the simultaneous operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

7. The control method for the opening and closing operation of the phase-separated magnetically controlled switch according to claim 6, characterized in that, The hybrid full-bridge circuit enables the three phases of the feeder switch mechanism to open and close at the zero-crossing point. When the feeder switch requires the sequential operation of phases A, B, and C of the feeder switch mechanism, the upper arms of the three left half-bridges are turned on according to the timing requirements through the timing control signals, and the lower arm of the common right half-bridge is turned on through the control signals. The positive current flows through the upper arm of the left half-bridge that is turned on according to the timing requirements to the positive terminal of the corresponding single-phase electromagnetic actuator, and then from the negative terminal of the corresponding single-phase electromagnetic actuator, it flows into the negative terminal through the lower arm of the common right half-bridge. At the same time, the corresponding single-phase electromagnetic actuator is energized by the current and starts to operate, thereby driving the feeder switch mechanism to complete the sequential operation of phases A, B, and C of the feeder switch mechanism. When the feeder switch requires the A, B, and C phases of the feeder switch mechanism to operate in sequence, the upper arm switch Q1 of the A-phase half-bridge circuit, the upper arm switch Q3 of the B-phase half-bridge circuit, and the upper arm switch Q5 of the C-phase half-bridge circuit are respectively turned on by the A-phase upper arm control signal, the B-phase upper arm control signal, and the C-phase upper arm control signal, according to the timing requirements. The lower arm switch Q2 of the A-phase half-bridge circuit... The lower arm switches Q4 and Q6 of the B-phase half-bridge circuit are not conducting via the A-phase lower arm control signal, the B-phase lower arm control signal, and the C-phase lower arm control signal, respectively. The lower arm switch Q8 of the common right half-bridge is conducting via the common right half-bridge lower arm control signal, while the upper arm switch Q7 of the common right half-bridge is not conducting via the common right half-bridge lower arm control signal. The positive VH+ current flows sequentially through the three left half-bridge switches Q1. Switches Q3 and Q5 are connected to the positive terminals of the A-phase, B-phase, and C-phase electromagnetic actuators, respectively. Then, the current flows into the negative terminal via the common right half-bridge switch Q8 from the negative terminals of the A-phase, B-phase, and C-phase electromagnetic actuators. The three electromagnetic actuators are simultaneously energized and start operating, thereby driving the feeder switch mechanism and completing the sequential operation of the A-phase, B-phase, and C-phase feeder switch mechanism.

Images