Power grid overvoltage intelligent protection control circuit

Abstract

The utility model discloses a power grid overvoltage intelligent protection control circuit, which relates to the field of power grids and comprises an equipment working module used for inputting power grid voltage to equipment through a switch; the power grid voltage detection module is used for detecting power grid voltage, supplying voltage to the power-off and indication module when the power grid voltage reaches a threshold value, and not supplying voltage to the power-off and indication module when the power grid voltage does not reach the threshold value; compared with the prior art, the beneficial effects of the utility model are that through the arrangement of the power-off and indication module, the power-off and indication module disconnects the switch when the power grid voltage is overvoltage and the voltage signal of the power grid voltage detection module is received, and when the power grid voltage returns to normal, the power grid voltage detection module stops outputting the voltage signal; and when the power failure and indication module is powered off, a corresponding light-emitting tube is turned on to indicate to return to normal, so that equipment faults and power grid accidents caused by mistakenly closing the switch during maintenance are avoided.

Description

Technical Field

[0001] The utility model relates to the field of power grids, in particular to a power grid overvoltage intelligent protection control circuit. Background Art

[0002] During power grid operation, various factors may affect the grid, leading to abnormal voltage increases, known as overvoltage. Overvoltage can cause serious damage to grid equipment and even lead to equipment failure and grid accidents. Therefore, overvoltage detection and protection can promptly detect and address overvoltage issues, effectively preventing equipment damage and grid accidents, thereby ensuring the safe and stable operation of the grid.

[0003] Existing protection circuits often disconnect the circuit after detecting overvoltage. During subsequent maintenance, it is unclear whether normal voltage has been restored. If the voltage is still overvoltage and the switch is closed rashly, it will still cause equipment failure and power grid accidents, which requires improvement. Utility Model Content

[0004] The purpose of the present invention is to provide a power grid overvoltage intelligent protection control circuit to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A power grid overvoltage intelligent protection control circuit, comprising:

[0007] Equipment working module, used to input grid voltage to the equipment through a switch;

[0008] The grid voltage detection module is used to detect the grid voltage. When the grid voltage reaches a threshold, it supplies voltage to the power-off and indication module. When the grid voltage does not reach the threshold, it does not supply voltage to the power-off and indication module.

[0009] The power-off and indication module is used to control the switch of the equipment working module to be disconnected after the voltage is input, and a light-emitting diode indicates lighting; when the voltage is input and then stops inputting voltage, another light-emitting diode indicates lighting;

[0010] The equipment working module is connected to the grid voltage detection module, and the grid voltage detection module is connected to the power-off and indication module.

[0011] As a further solution of the present invention: the device working module includes a switch S1 and a device Y, and the device Y is connected to the power grid through the switch S1.

[0012] As a further solution of the present invention: the grid voltage detection module includes a voltage conversion unit X1, a voltage conversion unit X2, a voltage conversion unit X3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, and an amplifier U1. The voltage conversion unit X1 is connected to the voltage conversion unit X2, the voltage conversion unit X3, one end of the resistor R1, one end of the resistor R2, and one end of the resistor R4. The other end of the resistor R1 is connected to the cathode of the diode D1 and the power-off and indication module. The positive pole of the diode D1 is grounded. The other end of the resistor R2 is connected to one end of the resistor R3 and the non-inverting end of the amplifier U1. The other end of the resistor R3 is grounded. The other end of the resistor R4 is connected to the cathode of the diode D2 and the inverting end of the amplifier U1. The positive pole of the diode D2 is grounded. The output end of the amplifier U1 is connected to the power-off and indication module.

[0013] As a further solution of the present invention: the voltage conversion unit X1, the voltage conversion unit X2, and the voltage conversion unit X3 have the same structure. The voltage conversion unit X1 includes a mutual inductor L1, a resistor R7, a diode D6, and a capacitor C1. One end of the mutual inductor L1 is grounded, and the other end of the mutual inductor L1 is connected to one end of the resistor R7 and the positive electrode of the diode D6. The other end of the resistor R7 is grounded, the negative electrode of the diode D6 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded.

[0014] As a further solution of the present utility model: the power-off and indication module includes a relay J1, a diode D3, a thyristor Z1, a resistor R5, a diode D4, a resistor R6, a MOS transistor V1, a MOS transistor V2, and a diode D5. One end of the relay J1 is connected to the cathode of the diode D3 and the grid voltage detection module, the other end of the relay J1 is connected to the anode of the diode D3 and the anode of the thyristor Z1, the control electrode of the thyristor Z1 is connected to the grid voltage detection module and the G electrode of the MOS transistor V2, the cathode of the thyristor Z1 is connected to one end of the resistor R5 and the G electrode of the MOS transistor V1, the other end of the resistor R5 is connected to the anode of the diode D4, the cathode of the diode D4 is grounded, one end of the resistor R6 is connected to the grid voltage detection module, the other end of the resistor R6 is connected to the D electrode of the MOS transistor V1, the S electrode of the MOS transistor V1 is connected to the S electrode of the MOS transistor V2, the D electrode of the MOS transistor V2 is connected to the anode of the diode D5, and the cathode of the diode D5 is grounded.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets a power-off and indication module. When the grid voltage is overvoltage, the power-off and indication module receives the voltage signal from the grid voltage detection module, and the power-off and indication module will disconnect the switch. When the grid voltage returns to normal, the grid voltage detection module stops outputting the voltage signal, and the corresponding light-emitting diode of the power-off and indication module lights up, indicating that it has returned to normal, thereby avoiding accidental closure of the switch during maintenance, which may lead to equipment failure and grid accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of a power grid overvoltage intelligent protection control circuit.

[0017] Figure 2 The circuit diagram is a power grid overvoltage intelligent protection control circuit.

[0018] Figure 3 This is the circuit diagram of the voltage conversion unit. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , a power grid overvoltage intelligent protection control circuit, comprising:

[0021] Equipment working module, used to input grid voltage to the equipment through a switch;

[0022] The grid voltage detection module is used to detect the grid voltage. When the grid voltage reaches a threshold, it supplies voltage to the power-off and indication module. When the grid voltage does not reach the threshold, it does not supply voltage to the power-off and indication module.

[0023] The power-off and indication module is used to control the switch of the equipment working module to be disconnected after the voltage is input, and a light-emitting diode indicates lighting; when the voltage is input and then stops inputting voltage, another light-emitting diode indicates lighting;

[0024] The equipment working module is connected to the grid voltage detection module, and the grid voltage detection module is connected to the power-off and indication module.

[0025] In this example: See Figure 2 ,The equipment working module includes switch S1 and device Y. Device Y is connected to the grid through switch S1.

[0026] When the grid is supplying power normally, switch S1 is closed, and the grid voltage is output to device Y through switch S1. Switch S1 is a three-pole single-throw switch.

[0027] In this example: See Figure 2The grid voltage detection module includes a voltage conversion unit X1, a voltage conversion unit X2, a voltage conversion unit X3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, and an amplifier U1. The voltage conversion unit X1 is connected to the voltage conversion unit X2, the voltage conversion unit X3, one end of the resistor R1, one end of the resistor R2, and one end of the resistor R4. The other end of the resistor R1 is connected to the cathode of the diode D1 and the power-off and indication module. The anode of the diode D1 is grounded. The other end of the resistor R2 is connected to one end of the resistor R3 and the non-inverting end of the amplifier U1. The other end of the resistor R3 is grounded. The other end of the resistor R4 is connected to the cathode of the diode D2 and the inverting end of the amplifier U1. The anode of the diode D2 is grounded. The output end of the amplifier U1 is connected to the power-off and indication module.

[0028] The voltage conversion units X1, X2, and X3 collect the voltage on the power grid and output it. The diode D1 is a voltage-stabilizing diode, and the voltage on it serves as a power supply to power the power-off and indication modules. The resistor R3 serves as a sampling resistor to feed back the grid voltage information to the non-inverting terminal of the amplifier U1. The diode D2 serves as a voltage-stabilizing diode to provide a reference voltage for the inverting terminal of the amplifier U1. When the grid voltage exceeds the threshold, the voltage at the non-inverting terminal of the amplifier U1 is higher than the voltage at the inverting terminal, and the amplifier U1 outputs a high level. When the grid voltage is normal, the voltage at the non-inverting terminal of the amplifier U1 is lower than the voltage at the inverting terminal, and the amplifier U1 outputs a low level.

[0029] In this example: See Figure 3 The voltage conversion unit X1, the voltage conversion unit X2, and the voltage conversion unit X3 have the same structure. The voltage conversion unit X1 includes a mutual inductor L1, a resistor R7, a diode D6, and a capacitor C1. One end of the mutual inductor L1 is grounded, the other end of the mutual inductor L1 is connected to one end of the resistor R7 and the positive electrode of the diode D6, the other end of the resistor R7 is grounded, the negative electrode of the diode D6 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded.

[0030] In the grid conversion units X1, X2, and X3, the grid voltage is collected through the transformer L1, rectified and filtered through the diode D6 and capacitor C1, converted into direct current, and output through the negative electrode of the diode D6.

[0031] In this example: See Figure 2The power-off and indication module includes a relay J1, a diode D3, a thyristor Z1, a resistor R5, a diode D4, a resistor R6, a MOS transistor V1, a MOS transistor V2, and a diode D5. One end of the relay J1 is connected to the cathode of the diode D3 and the grid voltage detection module, the other end of the relay J1 is connected to the anode of the diode D3 and the anode of the thyristor Z1, the control electrode of the thyristor Z1 is connected to the grid voltage detection module and the G electrode of the MOS transistor V2, the negative electrode of the thyristor Z1 is connected to one end of the resistor R5 and the G electrode of the MOS transistor V1, the other end of the resistor R5 is connected to the anode of the diode D4, the negative electrode of the diode D4 is grounded, one end of the resistor R6 is connected to the grid voltage detection module, the other end of the resistor R6 is connected to the D electrode of the MOS transistor V1, the S electrode of the MOS transistor V1 is connected to the S electrode of the MOS transistor V2, the D electrode of the MOS transistor V2 is connected to the anode of the diode D5, and the negative electrode of the diode D5 is grounded.

[0032] When amplifier U1 outputs a high level, thyristor Z1 conducts, energizing relay J1, controlling switch S1 to open, and triggering MOS transistor V1 (NMOS) to conduct. Diode D4 illuminates to indicate this state. When the maintenance grid voltage is normal, amplifier U1 outputs a low level, turning MOS transistor V2 (PMOS) on, causing diode D5 to illuminate, indicating normal grid voltage. When the grid is not high enough to trigger the power outage and indication module, diode D5 remains unlit because MOS transistor V1 is off.

[0033] The working principle of the utility model is as follows: the equipment working module is used to input the grid voltage to the equipment through the switch; the grid voltage detection module is used to detect the grid voltage, and when the grid voltage reaches the threshold, the voltage is supplied to the power-off and indication module; when the grid voltage does not reach the threshold, the voltage is not supplied to the power-off and indication module; the power-off and indication module is used to control the switch of the equipment working module to be disconnected after the voltage is input, and a light-emitting tube indicates lighting; when the voltage is input and the voltage input is stopped afterwards, another light-emitting tube indicates lighting.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A power grid overvoltage intelligent protection control circuit, characterized in that: The grid overvoltage intelligent protection control circuit includes: Equipment working module, used to input grid voltage to the equipment through a switch; The grid voltage detection module is used to detect the grid voltage. When the grid voltage reaches a threshold, it supplies voltage to the power-off and indication module. When the grid voltage does not reach the threshold, it does not supply voltage to the power-off and indication module. The power-off and indication module is used to control the switch of the equipment working module to be disconnected after the voltage is input, and a light-emitting diode indicates lighting; when the voltage is input and then stops inputting voltage, another light-emitting diode indicates lighting; The equipment working module is connected to the grid voltage detection module, and the grid voltage detection module is connected to the power-off and indication module.

2. The grid overvoltage intelligent protection control circuit according to claim 1, characterized in that: The device working module includes a switch S1 and a device Y. The device Y is connected to the power grid through the switch S1.

3. The grid overvoltage intelligent protection control circuit according to claim 1, characterized in that: The grid voltage detection module includes a voltage conversion unit X1, a voltage conversion unit X2, a voltage conversion unit X3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, and an amplifier U1. The voltage conversion unit X1 is connected to the voltage conversion unit X2, the voltage conversion unit X3, one end of the resistor R1, one end of the resistor R2, and one end of the resistor R4. The other end of the resistor R1 is connected to the cathode of the diode D1 and the power-off and indication module. The anode of the diode D1 is grounded. The other end of the resistor R2 is connected to one end of the resistor R3 and the non-inverting end of the amplifier U1. The other end of the resistor R3 is grounded. The other end of the resistor R4 is connected to the cathode of the diode D2 and the inverting end of the amplifier U1. The positive pole of the diode D2 is grounded. The output end of the amplifier U1 is connected to the power-off and indication module.

4. The grid overvoltage intelligent protection control circuit according to claim 3, characterized in that: The voltage conversion unit X1, the voltage conversion unit X2, and the voltage conversion unit X3 have the same structure. The voltage conversion unit X1 includes a mutual inductor L1, a resistor R7, a diode D6, and a capacitor C1. One end of the mutual inductor L1 is grounded, the other end of the mutual inductor L1 is connected to one end of the resistor R7 and the positive electrode of the diode D6, the other end of the resistor R7 is grounded, the negative electrode of the diode D6 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded.

5. The grid overvoltage intelligent protection control circuit according to claim 1, characterized in that: The power-off and indication module includes a relay J1, a diode D3, a thyristor Z1, a resistor R5, a diode D4, a resistor R6, a MOS transistor V1, a MOS transistor V2, and a diode D5. One end of the relay J1 is connected to the cathode of the diode D3 and the grid voltage detection module, the other end of the relay J1 is connected to the anode of the diode D3 and the anode of the thyristor Z1, the control electrode of the thyristor Z1 is connected to the grid voltage detection module and the G electrode of the MOS transistor V2, the cathode of the thyristor Z1 is connected to one end of the resistor R5 and the G electrode of the MOS transistor V1, the other end of the resistor R5 is connected to the anode of the diode D4, the cathode of the diode D4 is grounded, one end of the resistor R6 is connected to the grid voltage detection module, the other end of the resistor R6 is connected to the D electrode of the MOS transistor V1, the S electrode of the MOS transistor V1 is connected to the S electrode of the MOS transistor V2, the D electrode of the MOS transistor V2 is connected to the anode of the diode D5, and the cathode of the diode D5 is grounded.

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