CN219779763U - Bypass switch circuit and bypass switch device - Google Patents

Abstract

The utility model provides a bypass switch circuit and a bypass switch device, wherein the switch circuit comprises a current transformer circuit, a voltage transformer circuit, a control terminal and an operating mechanism, the control terminal comprises an AD sampling circuit, an open loop circuit, a remote signaling sampling circuit and a CPU control circuit, the open loop circuit is used for controlling the on-off of a switch arranged on a three-phase line, the remote signaling sampling circuit is used for receiving a control signal transmitted by the operating mechanism, and the AD samples the current and the voltage of the three-phase line and sends the current and the voltage to the CPU control circuit. Compared with the prior art, various abnormal states of the three-phase circuit are monitored and collected through various mutual inductance circuits, collected parameters are transmitted to the CPU controller circuit, the CPU controller circuit automatically controls the on-off of the switch on the three-phase circuit according to the parameters, monitoring of various abnormal states of the circuits can be achieved, the states of the switch can be automatically controlled, and the reliability of safe operation of the device is improved.

Description

Bypass switch circuit and bypass switch device

Technical Field

The utility model relates to the field of circuit protection, in particular to a bypass switch circuit and a bypass switch device.

Background

During operation of industrial currents, various circuit faults, such as short circuits or overloads, may occur. When a circuit failure occurs, it is necessary to be able to perform an opening operation of the circuit for a prescribed time, and a bypass switch is required to be incorporated for this opening operation.

The bypass switch used mostly at present belongs to a load switch, namely, the bypass switch is provided with a simple arc extinguishing device, rated load current and a certain overload current can be cut off, but the arc extinguishing device is simpler, so that the bypass switch cannot play a good role in protecting larger load current and overload current, and the existing bypass switch does not have fault protection and abnormal condition monitoring in operation, and cannot provide good safety and operation reliability for live working.

Disclosure of Invention

The present utility model is directed to overcoming at least one of the above-mentioned drawbacks of the prior art and providing a bypass switching circuit and a bypass switching device for providing a circuit with good safety and reliability during live working.

The scheme adopted by the utility model is as follows:

the bypass switch circuit comprises a current transformer circuit, a voltage transformer circuit, a control terminal and an operating mechanism;

the control terminal comprises an AD sampling circuit, a power management circuit, a backup power supply, an open loop circuit, a remote signaling sampling circuit and a CPU control circuit;

the open loop circuit is used for controlling the on-off of a switch arranged on a three-phase line;

the remote signaling sampling circuit is used for receiving a control signal transmitted by the operating mechanism;

the AD sampling circuit is respectively and electrically connected with the current transformer circuit, the voltage transformer circuit and the CPU control circuit, and is used for sampling the current and the voltage of the three-phase line and sending the sampled current and the sampled voltage to the CPU control circuit;

the CPU control circuit is electrically connected with the power management circuit, the backup power supply, the remote signaling sampling circuit and the switch loop circuit respectively;

the power management circuit is electrically connected with a backup power supply.

The AD sampling circuit, the voltage mutual inductance circuit and the current mutual inductance circuit form a line loss module of the bypass switch, the current mutual inductance circuit and the voltage mutual inductance circuit collect current and voltage of a three-phase line respectively, then collected data are transmitted to the AD sampling circuit, the AD sampling circuit carries out analog-to-digital processing on the data and then transmits the processed data to the CPU control circuit, and the CPU control circuit receives relevant data to finish sampling of the relevant data. The CPU control circuit can be used for sending a driving command to the open loop circuit according to the data so as to control the on-off of the three-phase circuit; the operating mechanism can send a driving signal to the remote signaling sampling circuit through physical switch control, the remote signaling sampling circuit receives the driving signal and transmits the driving signal to the CPU control circuit, the corresponding driving signal is sent to the open loop circuit according to the sent driving signal, and the open loop circuit controls the on-off of the three-phase circuit according to the driving signal; the backup power supply is formed by connecting two 12V power supplies in series to form 24V direct-current voltage for supplying power to each circuit in the control terminal; the circuit state of the three-phase line is automatically acquired and then transmitted to the CPU control circuit, so that the circuit state sampling of the three-phase line is completed. After receiving the three-phase line state, the CPU control circuit sends a corresponding driving signal to the open loop circuit, and the open loop circuit controls the switch, so that monitoring on various abnormal states and automatic control on-off of the three-phase line are realized, and the on-off of the three-phase line is manually controlled through the operating mechanism, so that high safety and operation reliability can be provided for live working based on the three-phase line.

Further, the current transformer circuit comprises a zero sequence current transformer circuit and a three-phase current transformer circuit;

the zero-sequence current transformer circuit comprises a zero-sequence current transformer and a protection resistor connected in parallel with the zero-sequence current transformer, the zero-sequence current transformer is arranged on a three-phase line, and two ends of the zero-sequence current transformer are electrically connected with the AD sampling circuit;

the three-phase current transformer circuit comprises three single-phase current transformer circuits with the same circuit structure, the three single-phase current transformer circuits respectively correspond to the three-phase lines, each single-phase current transformer circuit comprises a current transformer arranged on the corresponding three-phase line and a protection resistor connected with the current transformer in parallel, and two ends of the current transformer are electrically connected with the AD sampling circuit.

The zero sequence current transformer is arranged, so that the bypass switch circuit can monitor the conditions of different phases or currents in the three-phase line, and the monitoring capability of the bypass switch circuit on abnormal conditions is improved.

Further, the voltage transformer circuit comprises a primary voltage transformer circuit and a secondary voltage transformer circuit which have the same circuit structure, wherein the primary voltage transformer circuit is arranged in front of the three-phase line switch, and the secondary voltage transformer circuit is arranged behind the three-wire line switch;

the primary voltage transformer and the secondary voltage transformer are respectively arranged before and after the switch, the voltages at the two sides of the switch are respectively monitored, the working condition of the switch is known by comparing the voltages at the two sides of the switch, whether the switch is normally on-off or not or whether the switch is abnormal or not is known, and the reliability of safe operation of the device is improved.

Further, the bypass switch circuit further comprises a wireless communication circuit;

the wireless communication circuit is electrically connected with the CPU control circuit.

The bypass switch can be controlled remotely through the wireless communication circuit, and the operation of staff is facilitated.

Further, the operating mechanism comprises an active control unit and a state display unit;

the active control unit comprises a closing switch, a dividing switch, an energy-saving-free switch and a low-pressure switch, wherein one end of the closing switch, the dividing switch and one end of the energy-saving-free switch and one end of the low-pressure switch are respectively and electrically connected with the remote signaling sampling circuit, and the other end of the closing switch, the energy-saving-free switch and the low-pressure switch are electrically connected with the remote signaling sampling circuit after being mutually and electrically connected;

the state display unit comprises a closing state circuit, a separating state circuit and an energy storage state circuit, wherein one ends of the closing state circuit, the separating state circuit and the energy storage state circuit are respectively and electrically connected with the open loop circuit, and the other ends of the separating state circuit and the energy storage state circuit are electrically connected with the open loop circuit after being mutually and electrically connected.

The state display unit can intuitively display the current state of the switch, specifically a closing state, a separating state and a non-energy-storage state, and the bypass switch can be actively controlled by arranging the active control unit on the operating mechanism, so that the closing switch, the separating switch, the non-energy-storage switch and the low-pressure switch are respectively arranged, the closing, separating and non-energy-storage and low-pressure conditions of the switch are processed in decibels, and the reliability of safe operation of the bypass switch circuit is further improved.

The utility model also provides a bypass switch device for loading the bypass switch circuit, which comprises a switch shell, an operating mechanism box and a control box;

a switching device for controlling the on-off of the three-phase line, a current transformer circuit and a voltage transformer circuit are arranged in the switch shell;

an AD sampling circuit, a CPU control circuit, a power management circuit, a backup power supply, an open loop circuit and a remote signaling sampling circuit are arranged in the control cabinet;

an operating mechanism is arranged in the operating mechanism box;

the switch shell is connected with the control case, the control case is electrically connected with the operating mechanism case, and the control case is electrically connected with a circuit in the switch shell;

the bypass switch device is provided with a bypass switch circuit, and provides a device foundation for the bypass switch circuit; the switch shell is of a sealing structure and provides an airtight environment for the operation of the switch device.

Further, three pairs of main conductive loops are arranged on the switch housing, the three pairs of main conductive loops correspond to three-phase lines, and the three-phase lines are led into the switch housing through one of the corresponding pairs of main conductive loops and led out of the switch housing through the other main conductive loop.

The conductive loop also has sealing property on the premise that the three-phase circuit can well pass through the switch shell, so that the air tightness of the switch shell is improved.

Further, the switching device adopts a rotary arc type arc extinguishing device, and the rotary arc type arc extinguishing device comprises an arc extinguishing chamber and a moving contact.

Preferably, the arc-rotating type arc extinguishing device is an SF6 arc-rotating type self-energy arc extinguishing device, the arc extinguishing chamber is basin-shaped, a hole through which a moving contact can pass is formed in the bottom of the basin and is contacted with a fixed contact in the basin to form a conductive path, an arc extinguishing coil is arranged outside the arc extinguishing chamber, when the switching-off operation is carried out, namely, the moving contact is separated from the fixed contact, an arc is immediately transferred into the arc extinguishing chamber, at the moment, current passes through the external arc extinguishing coil, a magnetic field is formed in the arc extinguishing chamber, and the magnetic field is perpendicular to the direction of the arc, so that the arc rapidly rotates in the magnetic field and is elongated in the rotating process, and at the moment, the arc is extinguished at a zero crossing point through sulfur hexafluoride gas; the arc extinguishing device is simple in structure, and convenient to manufacture and install, and the volume of the device is reduced.

Further, an operating handle is arranged on the operating mechanism box and used for controlling the state of a switching device in the switch shell;

and the operating mechanism box is also provided with a state indicator lamp for prompting the current switch state.

The operating mechanism box comprises a brake separating spring and an energy storage spring which are respectively used for providing kinetic energy for brake separation and brake closing. The device is manually controlled through an operating handle, an energy storage spring and a brake separating spring in an operating mechanism box are controlled, the operations of closing, separating brake and the like of the arc rotating type arc extinguishing device are realized, the state of a current switch is displayed through a switch indicator lamp, and particularly, the brake separating spring releases kinetic energy to separate the switch, and the energy storage spring stores energy after the brake separating is completed; on the other hand, the energy storage spring releases kinetic energy to enable the switch to be switched on, and when the switching-on is completed, the switching-off spring stores energy, and the cycle is performed.

Specifically, the status indicator lamp includes a closing status indicator lamp, a brake separating status indicator lamp and an energy storage indicator lamp, corresponds to the closing status, the brake separating status and the energy storage status of the switch, and corresponds to the closing status circuit, the brake separating status circuit and the energy storage status circuit in the bypass switch circuit respectively, when the energy storage spring and the brake separating spring store energy, the energy storage status indicator lamp lights up.

Further, an operation panel is arranged on the control cabinet, and a closing total outlet and a separating total outlet are formed in the control cabinet;

the switching-on total outlet and the switching-off total outlet are respectively used for controlling the switching-on and switching-off states of the operating mechanism in the operating mechanism box.

Preferably, the switching-on total outlet and the switching-off total outlet are a switching-on connecting piece and a switching-off connecting piece, namely whether the switching-on function and the switching-off function are started or not is controlled.

Compared with the prior art, the utility model has the beneficial effects that: 1. the current transformer and the voltage transformer are adopted to sample the states of the three-phase circuit, sampling parameters are transmitted to the CPU control circuit, and the CPU control circuit judges whether the current state is in an abnormal state or not and what abnormal state is in according to the sampling parameters, so that the on-off of a switch on the three-phase circuit is controlled, the monitoring of various abnormal states is realized, and the reliability of the safe operation of the circuit and the device is improved.

2. The manual control of the three-wire line switch is realized through the operating mechanism and the corresponding operating mechanism box, and the reliability of safe operation of the circuit and the device is further improved.

3. Through adopting spiral arc extinguishing device, make the switch simple structure of device, make the device size reduce, reduced manufacturing cost, make things convenient for the installation and the setting of device simultaneously.

Drawings

Fig. 1 is a circuit diagram of a bypass switch circuit according to the present utility model.

Reference numerals: the system comprises a current transformer circuit 10, a zero sequence current transformer circuit 11, a three-phase current transformer circuit 12, a voltage transformer circuit 20, a primary voltage transformer circuit 21, a secondary voltage transformer circuit 22, a control terminal 30, a CPU control circuit 31, an AD sampling circuit 32, a power management circuit 33, a backup power supply 34, an open loop circuit 35, a remote signaling sampling circuit 36, an operating mechanism 40, an active control unit 41 and a state display unit 42.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the utility model. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

The present embodiment provides a bypass switch circuit, as shown in fig. 1, including a current transformer circuit 10, a voltage transformer circuit 20, a control terminal 30 and an operating mechanism 40;

the control terminal 30 comprises an AD sampling circuit 32, a power management circuit 33, a backup power supply 34, an open loop circuit 35, a remote signaling sampling circuit 36 and a CPU control circuit 31;

the open loop circuit 35 is used for controlling the on-off of a switch arranged on a three-phase line;

the remote signaling sampling circuit 36 is configured to receive a control signal transmitted by the operating mechanism 40;

the AD sampling circuit 32 is electrically connected with the current transformer circuit 10, the voltage transformer circuit 20 and the CPU control circuit 31 respectively, and is used for sampling the current and the voltage of the three-phase line and sending the sampled current and the sampled voltage to the CPU control circuit 31;

the CPU control circuit 31 is electrically connected with the power management circuit 33, the backup power supply 34, the remote signaling sampling circuit 36 and the open loop circuit respectively;

the power management circuit 33 is electrically connected to a backup power supply 34.

The current transformer circuit 10, the voltage transformer circuit 20 and the AD sampling circuit 32 together form a line loss module of the bypass circuit, and are used for sampling the state of the three-wire line and sending sampling signals to the CPU control circuit 31, and the CPU control circuit 31 controls the switch on the three-wire line through the connection with the open loop 35.

Specifically, the current transformer circuit 10 includes a zero sequence current transformer circuit 11 and a three-phase current transformer circuit 12;

the zero sequence current transformer circuit 11 comprises a zero sequence current transformer and a protection resistor connected in parallel with the zero sequence current transformer, the zero sequence current transformer is arranged on a three-phase line, and two ends of the zero sequence current transformer are electrically connected with the AD sampling circuit 32;

the three-phase current transformer circuit comprises three single-phase current transformer circuits with the same circuit structure, the three single-phase current transformer circuits respectively correspond to the three-phase lines, each single-phase current transformer circuit comprises a current transformer arranged on the corresponding three-phase line and a protection resistor connected with the current transformer in parallel, and two ends of the current transformer are electrically connected with the AD sampling circuit 32.

Specifically, the voltage transformer 20 includes a primary voltage transformer 21 and a secondary voltage transformer 22 with the same circuit structure, the primary voltage transformer 21 is disposed before the three-phase line switch, and the secondary voltage transformer 22 is disposed after the three-phase line switch;

the primary voltage transformer circuit 21 comprises three single-phase voltage transformer circuits with the same circuit structure, the three single-phase voltage transformer circuits respectively correspond to three-phase lines, the single-phase voltage transformer circuits are provided with two voltage transformers, one ends of the two voltage transformers connected in series are electrically connected with the three-phase lines, the other ends of the two voltage transformers are externally connected with GND ends, and the two voltage transformers are electrically connected with the AD sampling circuit 32 through the lines.

In a specific implementation process, the three-phase current transformer 12 is used for collecting current conditions of all three-phase lines, the zero-sequence current transformer 11 is used for collecting phase balance conditions of the currents of the three-phase lines, the primary voltage transformer 21 is used for collecting voltage conditions of the three-phase lines before switching, the secondary voltage transformer 22 is used for collecting voltage conditions of the three-phase lines after switching, all collected data are fed back to the CPU control circuit 31 and provided for the CPU circuit to be processed and controlled, the three-phase current transformer can be used for comparing and obtaining specific conditions of all switches on the current three-phase lines according to the voltage conditions before and after switching, all the states of the three-phase lines are monitored through all the mutual transformers, if all the parameters are normal, the three-phase current transformer is not operated, when abnormal parameters occur, the collected abnormal parameters are transmitted to the CPU control circuit 31, a controller chip in the CPU control circuit 31 receives the abnormal parameters and then sends corresponding driving signals to the opening circuit 35, and the opening circuit 35 receives the driving signals and then opens the switches according to the driving signals; when the three-phase line is recovered to be normal, each mutual inductance circuit collects three-phase line parameters to the CPU control circuit 31, and the CPU control circuit 31 sends a driving signal to the open loop circuit 35 after the parameter judgment circuit is recovered to be normal, and the open loop circuit 35 controls the switch to be turned on.

Specifically, the bypass switch circuit further comprises a wireless communication circuit;

the wireless communication circuit is electrically connected with the CPU control circuit 31.

In the specific implementation process, the CPU control circuit 31 processes the current collected data and sends the processed data to the wireless communication circuit, and the wireless communication circuit sends the data to the terminal of the user through the wireless network; or the wireless communication circuit receives the control signal sent by the user terminal and sends the control signal to the CPU control circuit 31 to control the on-off of the switch.

Specifically, the operating mechanism 40 includes an active control unit 41 and a status display unit 42;

the active control unit 41 includes a closing switch, a dividing switch, a non-energy-storage switch and a low-pressure switch, wherein one end of the closing switch, the dividing switch, the non-energy-storage switch and the low-pressure switch are respectively electrically connected with the remote signaling sampling circuit 36, and the other end of the closing switch and the low-pressure switch are electrically connected with the remote signaling sampling circuit 36 after being mutually electrically connected;

the state display unit 42 includes a closing state circuit, a separating state circuit and an energy storage state circuit, where one ends of the closing state circuit, the separating state circuit and the energy storage state circuit are respectively electrically connected to the open circuit 35, and the other ends are electrically connected to the open circuit 35 after being mutually electrically connected.

In a specific implementation process, each state circuit in the active control unit 41 in the operating mechanism 40 is provided with a switch, specifically an operating handle, the switching of each state is controlled by the operating handle to process various corresponding situations, specifically, when the handle is switched to the on-state, the on-state switch is closed, the on-state switch is detected to be closed by the remote signaling sampling circuit 36, a physical signal is converted into an electric signal and sent to the CPU control circuit 31, the CPU control circuit 31 receives the electric signal, a corresponding driving signal is sent to the on-off circuit according to the electric signal, the on-off circuit 35 controls the switch, and when the operating handle is switched to other circuits, the on-state of the circuit is similar to that described above; when the CPU control circuit 31 sends a driving signal to the open-loop circuit 35, the open-loop circuit 35 sends the current circuit state to the state display circuit, and the state display circuit controls the corresponding state circuit to display the current state.

Example 2

The present embodiment provides a bypass switching device for loading the bypass switching circuit in embodiment 1, including a switch housing, an operating mechanism box and a control box;

a switching device for controlling the on-off of a three-phase line, a current transformer circuit 10 and a voltage transformer circuit 20 are arranged in the switch shell;

specifically, three pairs of main conductive loops are arranged on the switch shell, the three pairs of main conductive loops correspond to three-phase circuits, one of the three-phase circuits is led into the switch shell through one of the corresponding pairs of main conductive loops, and the other three-phase circuit is led out of the switch shell through the other main conductive loop; the whole switch shell is of a sealing structure, the main conductive loop enables the three-phase circuit to pass through the switch shell, and sealing treatment is carried out at the passing position, so that the switch shell has higher tightness, and the arc extinction capability of a switch in the switch shell is improved;

specifically, the switch device adopts an SF6 rotary arc type self-energy arc extinguishing device, the SF6 rotary arc type self-energy arc extinguishing device comprises an arc extinguishing chamber and a moving contact, the arc extinguishing chamber is basin-shaped, a hole allowing the moving contact to pass through is formed in the bottom of the basin and is contacted with a fixed contact in the basin to form a conductive path, an arc extinguishing coil is arranged outside the arc extinguishing chamber, when the moving contact and the fixed contact are separated in a switching-off operation, an arc is immediately transferred into the arc extinguishing chamber, at the moment, current passes through the external arc extinguishing coil, a magnetic field is formed in the arc extinguishing chamber, the arc rapidly rotates in the magnetic field due to the fact that the magnetic field is perpendicular to the direction of the arc, and is lengthened in the rotating process, at the moment, the arc is extinguished due to the fact that six-stage sulfur gas has very high air tightness when the arc extinguishing device passes through a zero point;

an AD sampling circuit 32, a CPU control circuit 31, a power management circuit 33, a backup power supply 34, an open loop circuit 35 and a remote signaling sampling circuit 36 are arranged in the control cabinet;

specifically, an operation panel is arranged on the control cabinet, and a closing main outlet and a separating main outlet are formed in the control cabinet;

the switching-on total outlet and the switching-off total outlet are respectively used for controlling the switching-on and switching-off states of an operating mechanism in the operating mechanism box;

the switching-on main outlet and the switching-off main outlet are a switching-on connecting piece and a switching-off connecting piece, and whether the device can automatically switch on and switch off or not is controlled by arranging and taking out the connecting pieces.

An operating mechanism 40 is arranged in the operating mechanism box;

the operating mechanism box is provided with an operating handle for controlling the state of a switch device in the switch shell, and the operating mechanism box also comprises a brake separating spring and an energy storage spring which are respectively used for providing kinetic energy for brake separation and brake closing.

Specifically, the switching of the active control unit 41 that operates the operating mechanism 40 in the operating mechanism box in embodiment 1, the specific operation content has been described in embodiment 1, and will not be described here.

The switch shell is connected with the control case, the control case is electrically connected with the operating mechanism case, and the control case is electrically connected with a circuit in the switch shell.

In a specific implementation process, the three-phase circuit collects information of the three-phase circuit through the switch shell, the current transformer circuit 10 and the voltage transformer circuit 20 in the switch shell, the collected parameters are transmitted to the AD sampling circuit 32 in the control cabinet, specific circuit states and control are described in embodiment 1, the description is omitted here, then the control cabinet controls the circuit in the switch shell to be disconnected or connected, when the switch is controlled to be disconnected, the switch performs switching operation, at the moment, the energy storage state indicator lamp on the operating mechanism cabinet is turned off, the switching state indicator lamp is turned on, the current switching state is shown, the switching spring releases kinetic energy, the moving contact leaves the arc extinguishing chamber and is far away from the fixed contact, at the moment, an electric arc is generated, and due to the influence of a magnetic field generated by an outdoor coil of the arc extinguishing chamber, the electric arc is lengthened, at the moment, the alternating current is completely turned off when the switch is turned off, at the moment, the switching state indicator lamp is turned off, at the moment, the energy storage spring stores energy, and the energy storage state indicator lamp is turned on. When the control switch is turned on, the switch performs switching-on operation, at the moment, the energy storage state indicator lamp on the operating mechanism box is extinguished, the switching-on state indicator lamp is turned on to indicate the current switching-on state, the energy storage spring releases kinetic energy to enable the moving contact to enter the arc extinguishing chamber to be in contact with the fixed contact, the switch is turned on, the switching-off spring starts to store energy, the switching-on state indicator lamp is extinguished, and the energy storage state indicator lamp is turned on.

The switch state can be controlled through an operating handle on the operating mechanism box, the operating handle corresponds to a combination switch, a split switch, an energy-storage-free switch and a low-pressure switch, and the problems of combination, split, energy storage-free and low-pressure of the switches are solved correspondingly.

The control cabinet is also provided with an operation panel, and various automatic parameters can be set on the operation panel, so that the switching device can better realize automatic control, specifically, the energy storage time or energy storage energy of the opening spring and the energy storage spring and the like.

It should be understood that the foregoing examples of the present utility model are merely illustrative of the present utility model and are not intended to limit the present utility model to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present utility model should be included in the protection scope of the claims of the present utility model.

Claims (10)

1. The bypass switch circuit is characterized by comprising a current transformer circuit, a voltage transformer circuit, a control terminal and an operating mechanism;

the control terminal comprises an AD sampling circuit, a power management circuit, a backup power supply, an open loop circuit, a remote signaling sampling circuit and a CPU control circuit;

the open loop circuit is used for controlling the on-off of a switch arranged on a three-phase line;

the remote signaling sampling circuit is used for receiving a control signal transmitted by the operating mechanism;

the AD sampling circuit is respectively and electrically connected with the current transformer circuit, the voltage transformer circuit and the CPU control circuit, and is used for sampling the current and the voltage of the three-phase line and sending the sampled current and the sampled voltage to the CPU control circuit;

the CPU control circuit is electrically connected with the power management circuit, the backup power supply, the remote signaling sampling circuit and the switch loop circuit respectively;

the power management circuit is electrically connected with a backup power supply.

2. The bypass switching circuit according to claim 1, wherein the current transformer circuit comprises a zero sequence current transformer circuit and a three phase current transformer circuit;

the zero-sequence current transformer circuit comprises a zero-sequence current transformer and a protection resistor connected in parallel with the zero-sequence current transformer, the zero-sequence current transformer is arranged on a three-phase line, and two ends of the zero-sequence current transformer are electrically connected with the AD sampling circuit;

the three-phase current transformer circuit comprises three single-phase current transformer circuits with the same circuit structure, the three single-phase current transformer circuits respectively correspond to the three-phase lines, each single-phase current transformer circuit comprises a current transformer arranged on the corresponding three-phase line and a protection resistor connected with the current transformer in parallel, and two ends of the current transformer are electrically connected with the AD sampling circuit.

3. The bypass switching circuit according to claim 1, wherein the voltage transformer circuit comprises a primary voltage transformer circuit and a secondary voltage transformer circuit which have the same circuit structure, the primary voltage transformer circuit is arranged in front of the three-phase line switch, and the secondary voltage transformer circuit is arranged behind the three-wire line switch;

the primary voltage transformer circuit comprises three single-phase voltage transformer circuits with the same circuit structure, the three single-phase voltage transformer circuits respectively correspond to three-phase circuits, the single-phase voltage transformer circuits are provided with two voltage transformers, one end of each of the two voltage transformers connected in series is electrically connected with the three-phase circuit, the other end of each of the two voltage transformers is externally connected with a GND (ground lead) end, and the two voltage transformers are electrically connected with the AD sampling circuit through circuits.

4. The bypass switching circuit of claim 1, wherein the bypass switching circuit further comprises a wireless communication circuit;

the wireless communication circuit is electrically connected with the CPU control circuit.

5. A bypass switching circuit according to claim 1, wherein the operating mechanism comprises an active control unit, a status display unit;

the active control unit comprises a closing switch, a dividing switch, an energy-saving-free switch and a low-pressure switch, wherein one end of the closing switch, the dividing switch and one end of the energy-saving-free switch and one end of the low-pressure switch are respectively and electrically connected with the remote signaling sampling circuit, and the other end of the closing switch, the energy-saving-free switch and the low-pressure switch are electrically connected with the remote signaling sampling circuit after being mutually and electrically connected;

the state display unit comprises a closing state circuit, a separating state circuit and an energy storage state circuit, wherein one ends of the closing state circuit, the separating state circuit and the energy storage state circuit are respectively and electrically connected with the open loop circuit, and the other ends of the separating state circuit and the energy storage state circuit are electrically connected with the open loop circuit after being mutually and electrically connected.

6. A bypass switching device for carrying the bypass switching circuit according to any one of claims 1 to 5, comprising a switch housing, an operating mechanism box and a control box;

a switching device for controlling the on-off of the three-phase line, a current transformer circuit and a voltage transformer circuit are arranged in the switch shell;

an AD sampling circuit, a CPU control circuit, a power management circuit, a backup power supply, an open loop circuit and a remote signaling sampling circuit are arranged in the control cabinet;

an operating mechanism is arranged in the operating mechanism box;

the switch shell is connected with the control case, the control case is electrically connected with the operating mechanism case, and the control case is electrically connected with a circuit in the switch shell.

7. A bypass switching device as claimed in claim 6, characterized in that three pairs of main conductive loops are provided on the switch housing, the three pairs of main conductive loops corresponding to three phase lines, the three phase lines leading into the switch housing through one of the corresponding pair of main conductive loops and out of the switch housing through the other.

8. The bypass switching device of claim 6, wherein the switching device is a rotary arc quenching device comprising an arc quenching chamber and a moving contact.

9. A bypass switching device as claimed in claim 6, wherein the operating mechanism housing is provided with an operating handle for controlling the state of the switching means in the switch housing;

and the operating mechanism box is also provided with a state indicator lamp for prompting the current switch state.

10. The bypass switch device as claimed in claim 6, wherein the control cabinet is provided with an operation panel, a closing total outlet and a separating total outlet;

the switching-on total outlet and the switching-off total outlet are respectively used for controlling the switching-on and switching-off states of the operating mechanism in the operating mechanism box.