CN221326733U - Control loop broken line detection circuit between distribution terminal and circuit breaker - Google Patents
Control loop broken line detection circuit between distribution terminal and circuit breaker Download PDFInfo
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- CN221326733U CN221326733U CN202322533289.0U CN202322533289U CN221326733U CN 221326733 U CN221326733 U CN 221326733U CN 202322533289 U CN202322533289 U CN 202322533289U CN 221326733 U CN221326733 U CN 221326733U
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The utility model relates to the technical field of control loop disconnection detection, and discloses a control loop disconnection detection circuit between a power distribution terminal and a circuit breaker. The utility model judges whether the remote control loop of the secondary equipment of the circuit breaker is broken or not through the broken line detection function of the control loop, solves the defect that the broken line of the control loop is processed manually, and ensures that whether the remote control loop of the secondary equipment of the power distribution terminal is broken or not can be detected.
Description
Technical Field
The utility model relates to the technical field of control loop disconnection detection, in particular to a control loop disconnection detection circuit between a power distribution terminal and a circuit breaker.
Background
In power plants, substations and transmission lines, the opening and closing control of the circuit breakers and the load switches is realized through control loops of the circuit breakers and the load switches and an operating mechanism, the control loops are bridges for connecting primary equipment and secondary equipment, the operation of the secondary equipment on the primary equipment can be realized through the control loops, and the control of the low-voltage equipment on the high-voltage equipment is realized through the control loops.
The control loop circuit breaking is commonly existing in the middle of a 10KV circuit breaker control loop, and the circuit breaker cannot normally open or close after the control loop circuit breaking occurs, so that the circuit breaker is refused to operate, the normal operation of the circuit is influenced, the circuit breaker cannot be protected, and even a switch is damaged or burnt out, so that the daily production life is influenced. The general step of processing the disconnection of the control loop is to check whether the control power supply has faults or not, measure whether the voltage of the control power supply has abnormality by adopting a universal meter, and continuously check if the control power supply has no abnormality, sequentially measure the voltage of an auxiliary node of the control loop to the ground by using the universal meter, find a voltage change point, thereby determining the range of the faults. The defects of the method are that by adopting a manual processing mode, the faults cannot be processed in time due to various objective reasons, and the judgment and processing of the faults require technicians to be familiar with a control loop, so that the service level requirements of the technicians are higher; whether the remote control loop of the secondary equipment of the power distribution terminal has broken wires or not can not be detected.
The prior art is used for detecting disconnection of a switching-on/off control loop of a circuit breaker, and the following problems exist: ① Two identical prior art circuits are required to be applied to the power distribution terminal to be respectively connected with the opening and closing circuit of the circuit breaker, the circuit is complex, the number of devices is large, and the difficulty of PCB board distribution is increased. ② And the remote signaling signal filter circuit is not needed, and the remote signaling signal is easy to be interfered by the outside. ③ The circuit for preventing the optical coupler from being turned on by mistake is not provided, and the error remote signaling is reported when the optical coupler is turned on by mistake. ④ The control loop is optically coupled on during normal operation, and the design increases the power consumption of the device during normal operation. Therefore, a new control loop disconnection detecting circuit is needed to solve the above problems.
Disclosure of utility model
Aiming at the defects and defects existing in the prior art, the utility model provides a control loop disconnection detection circuit between a power distribution terminal and a circuit breaker.
The technical scheme for solving the technical problems is as follows:
A control loop disconnection detection circuit between a power distribution terminal and a circuit breaker comprises a first resistor, a second resistor, a first diode, a second diode, a first relay, a second relay, a piezoresistor RV1, a third resistor, a fourth resistor, a third diode, an optocoupler O1, a first capacitor and a fifth resistor.
One end of the first resistor is connected with a gate positive electrode (HZ+), and the other end of the first resistor is connected with a 12 pin of the first relay and the anode of the first diode; the cathode of the first diode and 1 pin and 3 pin of the first relay are connected with a first power supply 24V; one end of the second resistor is connected with a split gate positive electrode (FZ+), and the other end of the second resistor is connected with a 12 pin of the second relay and the anode of the second diode; the cathode of the second diode and the 1 pin of the first relay are connected with a first power supply 24V; the 4 pin and the 9 pin of the first relay are connected with the 3 pin of the second relay; the pin 4 and the pin 9 of the second relay are connected with the pin A of the optocoupler; the cathode of the third diode is connected with the pin A of the optocoupler, and the anode of the third diode is connected with the pin K of the optocoupler; the fourth resistor is connected between the A pole and the K pole of the optocoupler; one end of the third resistor is connected with the K pole of the optocoupler, and the other end of the third resistor is connected with the common ground (GND_P); one end of the piezoresistor RV1 is connected to the A pin of the optocoupler, and the other end of the piezoresistor RV is connected to the common ground (GND_P); the first capacitor is connected between the C pin and the E pin of the optocoupler; one end of the fifth resistor is connected with a C pin of the optocoupler, and the other end of the fifth resistor is connected with a second power supply 3.3V; and a C pin of the optical coupler outputs a control loop disconnection remote signaling signal YX-DX, and an E pin is Grounded (GND).
Further, the first resistor, the second resistor and the third resistor have the functions of voltage division and current limiting, so that the current flowing through the control loop is ensured to be kept at the milliamp level, and the control loop works normally.
Further, the first diode and the second diode clamp reverse voltages of the first relay and the second relay coil respectively, so that the relay cannot be damaged or abnormal in operation.
Further, the relay K1, the relay K2, the optocoupler O1 and the third resistor R3 form an optocoupler control loop.
Further, the fourth resistor prevents misleading of the optocoupler, and a small current flows through the optocoupler control loop through R4 to prevent misleading of the optocoupler.
Further, the third diode protects the optocoupler from damage due to reverse voltage.
Further, the first capacitor and the fifth resistor form a remote signaling signal filter circuit, and interference of the control loop disconnection remote signaling circuit is filtered.
Further, the piezoresistor, the first diode, the second diode, the relay K1, the relay K2 and the optocoupler are used as protection devices, so that the situation that the CPU is not interfered by an interference signal and the control loop disconnection signal is wrong when EMC (Electromagnetic Magnetic Compatibility, electromagnetic compatibility) experiments are carried out can be guaranteed.
The beneficial technical effects of the utility model are as follows: through this control circuit broken string detection function, judge whether the broken string appears in the remote control circuit of circuit breaker secondary equipment, solved the defect that adopts the manual mode to handle control circuit broken string, make the remote control circuit of distribution terminal secondary equipment whether have the broken string to detect. The specific advantages are as follows:
1. The circuit can realize the disconnection detection of the opening and closing loop, and reduces the difficulty of PCB board arrangement.
2. Through the remote signaling signal filter circuit, the anti-interference capability of the remote signaling signal is enhanced.
3. By the circuit for preventing the optical coupler from being turned on by mistake, the false remote signaling reporting caused by the misleading of the optical coupler is prevented.
4. The optical coupler is not conducted when the control loop is normal, so that the power consumption of equipment is reduced when the control loop works normally.
Drawings
Fig. 1 is a circuit diagram illustrating a circuit for detecting disconnection of a control loop between a power distribution terminal and a circuit breaker according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Examples: the circuit for detecting disconnection of a control loop between a power distribution terminal and a circuit breaker shown in fig. 1 comprises a first resistor R1, a second resistor R2, a first diode VD1, a second diode VD2, a first relay K1, a second relay K2, a piezoresistor RV1, a third resistor R3, a fourth resistor R4, a third diode VD3, an optocoupler O1, a first capacitor C1 and a fifth resistor R5.
One end of the first resistor R1 is connected with a closing positive stage (HZ+), and the other end of the first resistor R1 is connected with a 12 pin of the first relay K1 and the anode of the first diode VD 1; the cathode of the first diode VD1 and the 1 pin and the 3 pin of the first relay K1 are connected with a first power supply 24V; one end of the second resistor R2 is connected with a brake-separating positive stage (FZ+), and the other end of the second resistor R2 is connected with a 12 pin of the second relay K2 and the anode of the second diode VD 2; the cathode of the second diode VD2 and the 1 pin of the first relay K1 are connected with a first power supply 24V; the pin 4 and the pin 9 of the first relay K1 are connected with the pin 3 of the second relay K2; the pin 4 and the pin 9 of the second relay K2 are connected with the pin A of the optical coupler O1; the cathode of the third diode VD2 is connected with the A pin of the optical coupler O1, and the anode is connected with the K pin of the optical coupler O1; the fourth resistor R4 is connected between the A pole and the K pole of the optical coupler O1; one end of the third resistor R3 is connected with the K pole of the optical coupler O1, and the other end of the third resistor R is connected with the common ground (GND_P); one end of the piezoresistor RV1 is connected to the A pin of the optical coupler O1, and the other end of the piezoresistor RV is connected to the common ground (GND_P); the first capacitor C1 is connected between the pin C and the pin E of the optical coupler O1; one end of the fifth resistor R5 is connected with the C pin of the optical coupler O1, and the other end of the fifth resistor R5 is connected with the second power supply 3.3V; and a pin C of the optical coupler O1 outputs a control loop disconnection remote signaling signal YX-DX, and a pin E is Grounded (GND).
The first resistor R1, the second resistor R2 and the third resistor R3 have the functions of voltage division and current limiting, so that the current flowing through the control loop is ensured to be milliamp, and the control loop works normally.
Through first diode VD1, second diode VD2, the reverse voltage of clamp first relay K1 and second relay K2 coil respectively makes the relay can not damage or work unusual.
The relay K1, the relay K2, the optocoupler O1 and the third resistor R3 form an optocoupler control loop.
The fourth resistor R4 is used for preventing misleading of the optocoupler, and a small current flows through the control loop of the optocoupler through the resistor R4 so as to prevent misleading of the optocoupler.
The optocoupler O1 is protected from damage due to reverse voltage by the third diode VD 3.
The first capacitor C1 and the fifth resistor R5 form a remote signaling signal filter circuit for filtering the interference of the control loop disconnection remote signaling circuit.
The piezoresistor RV1, the first diode VD1, the second diode VD2, the relay K1, the relay K2 and the optocoupler E1 are used as protection devices, so that when EMC (Electromagnetic Magnetic Compatibility, electromagnetic compatibility) experiments are carried out, the CPU can not be interfered by an interference signal, and the condition of error of a control loop disconnection signal can not occur.
When the control loop works normally, one of the switching-on anode HZ+ and the switching-off anode FZ+ is always conducted, and then one of the first relay K1 and the second relay K2 is always in a working state, at the moment, the optocoupler control loop is not conducted, and the MCU recognizes that the output of the control loop disconnection remote signaling signal YX-DX is high level and does not process.
When the control loop is broken, the switching-on anode HZ+ and the switching-off anode FZ+ are not conducted, and then the first relay K1 and the second relay K2 are in an inactive state, so that the optocoupler control loop is conducted, a control loop broken line remote signaling signal YX-DX is pulled down, the control loop broken line remote signaling signal is low, the MCU recognizes that the control loop broken line remote signaling signal YX-DX is low, at the moment, the circuit breaker control loop is indicated to have a problem, the control loop broken line remote signaling is reported, and the attendant is reminded of timely finding and processing faults.
The above embodiments are illustrative of the specific embodiments of the present utility model, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the utility model, so that all such equivalent embodiments are intended to be within the scope of the utility model.
Claims (7)
1. The control loop disconnection detection circuit between the power distribution terminal and the circuit breaker is characterized by comprising a first resistor, a second resistor, a first diode, a second diode, a first relay, a second relay, a piezoresistor RV1, a third resistor, a fourth resistor, a third diode, an optocoupler O1, a first capacitor and a fifth resistor;
One end of the first resistor is connected with a gate positive electrode (HZ+), and the other end of the first resistor is connected with a 12 pin of the first relay and the anode of the first diode; the cathode of the first diode and 1 pin and 3 pin of the first relay are connected with a first power supply 24V; one end of the second resistor is connected with a split gate positive electrode (FZ+), and the other end of the second resistor is connected with a 12 pin of the second relay and the anode of the second diode; the cathode of the second diode and the 1 pin of the first relay are connected with a first power supply 24V; the 4 pin and the 9 pin of the first relay are connected with the 3 pin of the second relay; the pin 4 and the pin 9 of the second relay are connected with the pin A of the optocoupler; the cathode of the third diode is connected with the pin A of the optocoupler, and the anode of the third diode is connected with the pin K of the optocoupler; the fourth resistor is connected between the A pole and the K pole of the optocoupler; one end of the third resistor is connected with the K pole of the optocoupler, and the other end of the third resistor is connected with the common ground (GND_P); one end of the piezoresistor RV1 is connected to the A pin of the optocoupler, and the other end of the piezoresistor RV is connected to the common ground (GND_P); the first capacitor is connected between the C pin and the E pin of the optocoupler; one end of the fifth resistor is connected with a C pin of the optocoupler, and the other end of the fifth resistor is connected with a second power supply 3.3V; and a C pin of the optical coupler outputs a control loop disconnection remote signaling signal YX-DX, and an E pin is Grounded (GND).
2. The circuit for detecting disconnection of a control loop between a power distribution terminal and a circuit breaker according to claim 1, wherein the first resistor, the second resistor and the third resistor have voltage dividing and current limiting functions, so that the current flowing through the control loop is kept at a level of milliamperes, and the control loop works normally.
3. The circuit for detecting disconnection of a control loop between a power distribution terminal and a circuit breaker according to claim 1, wherein the first diode and the second diode clamp reverse voltages of the first relay and the second relay coil, respectively, so that the relay is not damaged or abnormal in operation.
4. The circuit for detecting disconnection of a control loop between a power distribution terminal and a circuit breaker according to claim 1, wherein the relay K1 and the relay K2 and the optocoupler O1 and the third resistor R3 form an optocoupler control loop.
5. The circuit of claim 1, wherein the fourth resistor prevents misleading of the optocoupler and wherein a small current flows through the optocoupler control loop via R4 to prevent misleading of the optocoupler.
6. The circuit of claim 1, wherein the third diode protects the optocoupler from damage due to reverse voltage.
7. The circuit of claim 1, wherein the first capacitor and the fifth resistor form a telemetry signal filter circuit for filtering interference from the telemetry circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322533289.0U CN221326733U (en) | 2023-09-19 | 2023-09-19 | Control loop broken line detection circuit between distribution terminal and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322533289.0U CN221326733U (en) | 2023-09-19 | 2023-09-19 | Control loop broken line detection circuit between distribution terminal and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221326733U true CN221326733U (en) | 2024-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322533289.0U Active CN221326733U (en) | 2023-09-19 | 2023-09-19 | Control loop broken line detection circuit between distribution terminal and circuit breaker |
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| Country | Link |
|---|---|
| CN (1) | CN221326733U (en) |
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2023
- 2023-09-19 CN CN202322533289.0U patent/CN221326733U/en active Active
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