Remote control switching reclosing function device

Abstract

The invention discloses a remote control switching reclosing function device, comprising a signal detection unit used for receiving and identifying a reset signal and a closing signal and isolating the reset signal and the closing signal; the signal delay circuit is connected with the signal detection unit and is used for delaying the pulse widths of the reset signal and the closing signal according to the closing requirement of the relay; the relay driver is connected with the signal delay circuit and is used for receiving the reset signal and the closing signal and driving the relay; two groups of relays are adopted, one group of relays is connected to external control, and the other group of relays is connected to the LED lamp; the two groups of relays are completely the same and are adjacent in installation position. According to the invention, the operation of the reclosing device is realized through the remote control signal, so that the problems in the prior art are solved, and the operation efficiency and safety of a power system are improved.

Description

Technical Field

[0001] The invention relates to the field of reclosing switches, and more specifically to a remote control reclosing switch function device. Background Art

[0002] With the rapid development of power systems, the stability and reliability of power grids have become important indicators of the power industry. In existing power systems, reclosing devices are widely used in transmission lines as an important technology to improve power supply reliability. However, traditional reclosing device operations usually require workers to go on-site, which not only consumes a lot of time and human resources, but also may bring safety risks in some remote or dangerous working environments.

[0003] The main function of the reclosing device is to automatically cut off the power supply when a transmission line fault occurs, and automatically reclose the circuit breaker to restore power supply after the fault is eliminated. This process is successful in most cases because most transmission line faults are instantaneous, such as lightning strikes, wind damage, etc. However, the operation of traditional reclosing devices requires manual operation by on-site personnel, which to a certain extent limits the response speed and automation level of the power system.

[0004] In order to solve this problem, the application of remote control technology has become an important development direction of power system automation. Through remote control, the reclosing device can be remotely operated, thereby reducing the need for on-site operation and improving the operating efficiency and safety of the power system. However, the application of remote control technology in power systems still faces some challenges, such as the stability and safety of signal transmission and compatibility with existing power systems. Summary of the invention

[0005] An embodiment of the present invention provides a remote control reclosing function device. The present invention aims to provide a remote control reclosing function device, which operates the reclosing device through remote control signals to solve the problems existing in the prior art and improve the operating efficiency and safety of the power system.

[0006] In order to achieve the above object, the present invention provides a remote control reclosing function device, comprising:

[0007] A signal detection unit, used for receiving and identifying a reset signal and a closing signal, and isolating the reset signal and the closing signal;

[0008] A signal delay circuit is connected to the signal detection unit and is used to delay the pulse width of the reset signal and the closing signal respectively according to the closing requirement of the relay;

[0009] A relay driver is connected to a signal delay circuit and is used to receive a reset signal and a closing signal and drive a relay;

[0010] There are two groups of relays, one group of relays is connected to the external control, and the other group of relays is connected to the LED lights; these two groups of relays are exactly the same and are installed in adjacent positions.

[0011] Furthermore, the reset signal and the closing signal are both 220V DC narrow pulse signals, respectively sent from a control machine.

[0012] Furthermore, the relay is a magnetic latching relay.

[0013] Furthermore, the signal detection unit includes a reset signal detection branch and a close signal detection branch.

[0014] Furthermore, the reset signal detection branch includes a resistor R1, a resistor R2, a photocoupler T1, a power supply VCC, and a voltage-stabilizing diode D2; the resistor R1 receives the reset signal; the photocoupler T1 includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is respectively connected to the cathodes of the resistor R1 and the voltage-stabilizing diode D2; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R2, and the other end is connected to the signal delay circuit.

[0015] Furthermore, the closed signal detection branch includes a resistor R6, a resistor R7, a photocoupler T2, a power supply VCC, and a voltage-stabilizing diode D3; the resistor R6 receives a reset signal; the photocoupler T2 includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is respectively connected to the cathode of the resistor R6 and the voltage-stabilizing diode D3; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 can receive a GND signal; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R7, and the other end is connected to the signal delay circuit.

[0016] Furthermore, the signal delay circuit has two identical groups, one group is connected to the reset signal detection branch, and the other group is connected to the closed signal detection branch; the signal delay circuit includes a power supply VCC, a transistor, a first capacitor, a second capacitor, an AND gate, a NAND gate, a first resistor, a second resistor, and a third resistor; the base of the transistor is connected to the reset signal detection branch or the closed signal detection branch; the emitter of the transistor is respectively connected to the ground and the relay drive; the collector of the transistor is connected to the power supply VCC through the first resistor; the collector of the transistor is connected to the AND gate; the first capacitor is connected between the collector and the emitter of the transistor, and is also respectively connected to the AND gate and the relay drive; the output end of the AND gate is connected to an input end of the NAND gate, and the second capacitor is respectively connected to the other input end of the NAND gate, the second resistor, the relay drive and the ground; the second resistor is connected to the power supply VCC; the output end of the NAND gate is connected to the relay drive through the third resistor R5.

[0017] Furthermore, the relay driver includes two triodes; the bases and emitters of the two triodes are respectively connected to the signal delay module; and the collectors of the two triodes are respectively connected to the relay and another relay.

[0018] Furthermore, the relay closing time is 5 ms, and the signal delay circuit can delay the pulse width of the reset signal and the closing signal by 100 ms.

[0019] The innovation of the present invention is to design a remote control reclosing function device that can convert 220V DC narrow pulse signal into 12V long pulse signal, extend the signal pulse width to 100ms through the signal delay circuit to meet the relay closing requirement, and use two groups of magnetic latching relays to compare with each other, one group as output and one group as reference comparison to enhance the stability and reliability of the system. In addition, an LED light is added to intuitively display the status of the relay, making the operation more intuitive and convenient.

[0020] The present invention improves operational efficiency: by operating the reclosing device through remote control signals, the need for on-site operation is reduced, time and human resources are saved, and the speed of power grid fault response is increased. Enhanced safety: remote operation reduces the operating risks of workers in dangerous environments and improves the safety of operations. Reduced energy consumption: by using magnetic holding relays, the state can be maintained without consuming electricity after the action is executed, which effectively saves electricity consumption. Improved signal stability: through the signal detection unit and the signal delay circuit, the stability and anti-interference ability of the signal are enhanced, ensuring the accurate transmission of the signal. Enhanced system reliability: the design of the two groups of relays provides the functions of mutual comparison and reference, improving the reliability and fault tolerance of the system. Convenient status observation: the relay status is intuitively displayed through the LED light, making the working status of the system more intuitive and convenient for monitoring and troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 is a working principle diagram of an embodiment of the present invention;

[0023] Figure 2 Detailed circuit diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 As shown, the embodiment of the present invention provides a remote control reclosing function device, including:

[0028] A signal detection unit, used for receiving and identifying a reset signal and a closing signal, and isolating the reset signal and the closing signal;

[0029] A signal delay circuit is connected to the signal detection unit and is used to delay the pulse width of the reset signal and the closing signal respectively according to the closing requirement of the relay;

[0030] A relay driver is connected to a signal delay circuit and is used to receive a reset signal and a closing signal and drive a relay;

[0031] Two groups of relays are used, one group of relays is connected to the external control, and the other group of relays is connected to the LED light; these two groups of relays are exactly the same and installed in adjacent positions. The relays are magnetic latching relays.

[0032] The reset signal and the closing signal are both 220V DC narrow pulse signals, which are respectively sent from the control machine. The signal detection unit includes a reset signal detection branch and a closing signal detection branch.

[0033] The reset signal detection branch includes a resistor R1, a resistor R2, a photocoupler T1, a power supply VCC, and a voltage-stabilizing diode D2. The resistor R1 receives the reset signal. The photocoupler T1 includes a light-emitting diode and a phototransistor. The anode of the light-emitting diode is connected to the cathode of the resistor R1 and the voltage-stabilizing diode D2 respectively; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R2, and the other end is connected to the signal delay circuit.

[0034] The closed signal detection branch includes a resistor R6, a resistor R7, a photocoupler T2, a power supply VCC, and a voltage-stabilizing diode D3. The resistor R6 receives a reset signal. The photocoupler T2 includes a light-emitting diode and a phototransistor. The anode of the light-emitting diode is connected to the cathode of the resistor R6 and the voltage-stabilizing diode D3, respectively. The cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2. The anode of the voltage-stabilizing diode D2 can receive a GND signal. The anode of the voltage-stabilizing diode D2 is grounded. One end of the phototransistor is connected to the power supply VCC through the resistor R7, and the other end is connected to the signal delay circuit.

[0035] The signal delay circuit has two identical groups, one group is connected to the reset signal detection branch, and the other group is connected to the closed signal detection branch. The signal delay circuit includes a power supply VCC, a transistor, a first capacitor, a second capacitor, an AND gate, a NAND gate, a first resistor, a second resistor, and a third resistor. The base of the transistor is connected to the reset signal detection branch or the closed signal detection branch. The emitter of the transistor is connected to the ground and the relay driver respectively. The collector of the transistor is connected to the power supply VCC through the first resistor. The collector of the transistor is connected to the AND gate. The first capacitor is connected between the collector and the emitter of the transistor, and is also connected to the AND gate and the relay driver respectively. The output end of the AND gate is connected to an input end of the NAND gate, and the second capacitor is respectively connected to the other input end of the NAND gate, the second resistor, the relay driver and the ground. The second resistor is connected to the power supply VCC. The output end of the NAND gate is connected to the relay driver through the third resistor R5.

[0036] The relay driver comprises two transistors; the bases and emitters of the two transistors are respectively connected to the signal delay module; and the collectors of the two transistors are respectively connected to the relay and another relay.

[0037] The relay closing time is 5ms, and the signal delay circuit can delay the pulse width of the reset signal and the closing signal by 100ms.

[0038] like Figure 1 As shown in FIG. 1 , the specific system design and architecture of the embodiment of the present invention are shown. Figure 2 As shown, it is a structural diagram of the overall circuit of the present invention.

[0039] At present, the remote control signal in the office is sent from the control machine, outputting the reset signal of group A and the closing signal of group B. Both of them are 220V DC narrow pulse signals.

[0040] The AB signals shown are signals sent by the control host. In order to avoid interference, a signal detection unit is required. The purpose of the signal detection unit is to better identify the signal and isolate the signal to avoid interference between multiple systems.

[0041] The signal detection unit comprises a reset signal detection branch and a close signal detection branch.

[0042] The reset signal detection branch includes a resistor R1, a resistor R2, a photocoupler T1, a power supply VCC, and a voltage-stabilizing diode D2. The resistor R1 receives the reset signal. The photocoupler T1 includes a light-emitting diode and a phototransistor. The anode of the light-emitting diode is connected to the cathode of the resistor R1 and the voltage-stabilizing diode D2 respectively; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R2, and the other end is connected to the signal delay circuit.

[0043] The closed signal detection branch includes a resistor R6, a resistor R7, a photocoupler T2, a power supply VCC, and a voltage-stabilizing diode D3. The resistor R6 receives a reset signal. The photocoupler T2 includes a light-emitting diode and a phototransistor. The anode of the light-emitting diode is connected to the cathode of the resistor R6 and the voltage-stabilizing diode D3, respectively. The cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2. The anode of the voltage-stabilizing diode D2 can receive a GND signal. The anode of the voltage-stabilizing diode D2 is grounded. One end of the phototransistor is connected to the power supply VCC through the resistor R7, and the other end is connected to the signal delay circuit.

[0044] The AB signal shown is a narrow pulse signal, generally about 1ms, and the relay closing time is generally about 5ms. Therefore, the AB signal needs to be processed so that the signal is extended to about 100ms. The embodiment of the present invention designs a signal delay circuit, which can delay the signal pulse width by about 100ms to meet the closing requirements of the relay. Figure 2 The delayed portion of the signal shown:

[0045] The signal delay circuit has two identical groups, one group is connected to the reset signal detection branch, and the other group is connected to the closed signal detection branch; the signal delay circuit includes a power supply VCC, a transistor, a first capacitor, a second capacitor, an AND gate, a NAND gate, a first resistor, a second resistor, and a third resistor. The base of the transistor is connected to the reset signal detection branch or the closed signal detection branch; the emitter of the transistor is connected to the ground and the relay drive respectively. The collector of the transistor is connected to the power supply VCC through the first resistor. The collector of the transistor is connected to the AND gate. The first capacitor is connected between the collector and the emitter of the transistor, and is also connected to the AND gate and the relay drive respectively. The output end of the AND gate is connected to an input end of the NAND gate, and the second capacitor is respectively connected to the other input end of the NAND gate, the second resistor, the relay drive and the ground; the second resistor is connected to the power supply VCC. The output end of the NAND gate is connected to the relay drive through the third resistor R5.

[0046] The relay driver can drive the relay. The relay uses a magnetic latching relay, which is turned on in one direction and closed in the other direction. After the magnetic latching relay completes the action, it can keep consuming no power, saving energy consumption.

[0047] This project uses two sets of magnetic latching relays, one set is connected to the external control, and the other is connected to a small LED light. The two sets of relays are exactly the same and are installed adjacent to each other. The reason for this design is that the magnetic latching relay is easily affected by external forces and changes its state. Therefore, two magnetic latching relays are designed, one to drive the external control and the other to observe the state.

[0048] In order to make it easier to observe the status, the switch status of the two relays can be seen with the naked eye; in order to make the switch status more obvious, a small LED is added to the other relay to observe the on and off.

[0049] As shown in the figure above: A, B, GND input signal detection circuit. For the sake of simplicity, we will start with A.

[0050] When A has a signal, the signal flows into the LED inside the optocoupler T1 through the resistor R1, the internal switch is turned on, and the VCC current flows into the transistor Q1 through the resistor R2. The diode D2 is a 5V voltage regulator diode, which is mainly used to prevent excessive forward and reverse surge voltages and protect the optocoupler.

[0051] In the signal delay circuit, resistor R3 and capacitor C1 form a delay circuit. When a signal comes, Q3 is turned on immediately, the input of the AND gate becomes low, and the output is also low. When the A signal disappears, due to the action of resistor R3 and capacitor C1, the input voltage of the AND gate rises slowly, which delays the signal in disguise.

[0052] One leg of the NAND gate U2 is connected to the resistor R4 and the capacitor C2, and the other leg is connected to the output of the AND gate U1. When in steady state, the voltage at the C2 end is always high. It is worth noting that when A has a signal, U1 outputs 0. At this time, one end of U2 is high and the other end is low, and the output is a high level. After R5 turns on the transistor Q4, the relay can be turned on.

[0053] It is worth noting that the resistor R4 and the capacitor C2 are designed to charge slowly when the power is turned on, forcing all relays to close in one direction. After a period of time after power-on, they remain constantly high. At this time, the conduction logic depends on U1.

[0054] The same is true for Group B signals.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Remote control reclosing function device, characterized by: include: A signal detection unit, used for receiving and identifying a reset signal and a closing signal, and isolating the reset signal and the closing signal; A signal delay circuit is connected to the signal detection unit and is used to delay the pulse width of the reset signal and the closing signal respectively according to the closing requirement of the relay; A relay driver is connected to a signal delay circuit and is used to receive a reset signal and a closing signal and drive a relay; There are two groups of relays, one group of relays is connected to the external control, and the other group of relays is connected to the LED lights; these two groups of relays are exactly the same and are installed in adjacent positions.

2. The remote control reclosing function device according to claim 1 is characterized in that: The reset signal and the closing signal are both 220V DC narrow pulse signals, which are respectively sent from the control machine.

3. The remote control reclosing function device according to claim 1 is characterized in that: The relay is a magnetic latching relay.

4. The remote control reclosing function device according to claim 1 is characterized in that: The signal detection unit includes a reset signal detection branch and a close signal detection branch.

5. The remote control reclosing function device according to claim 4 is characterized in that: The reset signal detection branch includes a resistor R1, a resistor R2, a photocoupler T1, a power supply VCC, and a voltage-stabilizing diode D2; the resistor R1 receives a reset signal; the photocoupler T1 includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is respectively connected to the cathode of the resistor R1 and the voltage-stabilizing diode D2; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R2, and the other end is connected to the signal delay circuit.

6. The remote control reclosing function device according to claim 4 is characterized in that: The closed signal detection branch includes a resistor R6, a resistor R7, a photocoupler T2, a power supply VCC, and a voltage-stabilizing diode D3; the resistor R6 receives a reset signal; the photocoupler T2 includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is respectively connected to the cathode of the resistor R6 and the voltage-stabilizing diode D3; the cathode of the light-emitting diode is connected to the anode of the voltage-stabilizing diode D2; the anode of the voltage-stabilizing diode D2 can receive a GND signal; the anode of the voltage-stabilizing diode D2 is grounded; one end of the phototransistor is connected to the power supply VCC through the resistor R7, and the other end is connected to the signal delay circuit.

7. The remote control reclosing function device according to claim 4 is characterized in that: The signal delay circuit has two identical groups, one group is connected to the reset signal detection branch, and the other group is connected to the closed signal detection branch; the signal delay circuit includes a power supply VCC, a transistor, a first capacitor, a second capacitor, an AND gate, a NAND gate, a first resistor, a second resistor, and a third resistor; the base of the transistor is connected to the reset signal detection branch or the closed signal detection branch; the emitter of the transistor is respectively connected to the ground and the relay drive; the collector of the transistor is connected to the power supply VCC through the first resistor; the collector of the transistor is connected to the AND gate; the first capacitor is connected between the collector and the emitter of the transistor, and is also respectively connected to the AND gate and the relay drive; the output end of the AND gate is connected to an input end of the NAND gate, and the second capacitor is respectively connected to the other input end of the NAND gate, the second resistor, the relay drive and the ground; the second resistor is connected to the power supply VCC; the output end of the NAND gate is connected to the relay drive through the third resistor R5.

8. The remote control reclosing function device according to claim 1 is characterized in that: The relay driver comprises two triodes; the bases and emitters of the two triodes are respectively connected to the signal delay module; the collectors of the two triodes are respectively connected to the relay and another relay.

9. The remote control reclosing function device according to claim 1 is characterized in that: The relay closing time is 5ms, and the signal delay circuit can delay the pulse width of the reset signal and the closing signal by 100ms.

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