Pole-mounted circuit breaker control loop disconnection state inspection system

Abstract

The utility model discloses a pole-mounted circuit breaker control loop disconnection state inspection system, and belongs to the technical field of distribution automation monitoring. Which comprises a pole-mounted circuit breaker and a controller, and is characterized by further comprising a trigger unit and a feedback unit, the controller is connected with the trigger unit, a detection power supply sequentially passes through the trigger unit, the feedback unit and a coil of the pole-mounted circuit breaker to form a loop, and an output end of the feedback unit is connected with a signal input end of the controller. The pole-mounted circuit breaker control loop disconnection state inspection system is provided with the trigger unit and the feedback unit, when disconnection judgment needs to be carried out on the pole-mounted circuit breaker, the detection power supply is loaded to the coil of the pole-mounted circuit breaker through the trigger unit and the feedback unit, and the feedback of the judgment result is carried out through the feedback unit; according to actual on-site requirements, the on-site use is more flexible by switching on or switching off the disconnection judgment of the pole-mounted circuit breaker, and the inspection of the pole-mounted circuit breaker is more favorably realized.

Description

Technical Field

[0001] A system for inspecting the disconnection status of a pole-mounted circuit breaker control circuit belongs to the field of power distribution automation monitoring technology. Background Technology

[0002] With the rapid development of the power industry and the continuous increase in power supply, pole-mounted circuit breakers are often used on interconnections, sectionalizing lines, and branch lines in the power grid to improve power supply reliability. The management of pole-mounted circuit breakers is a crucial aspect of the power supply system. If a break in the control circuit of a pole-mounted circuit breaker occurs, it will affect the operation of the contacts within the circuit breaker, further impacting power supply reliability and safety.

[0003] In existing technologies, the management of pole-mounted circuit breakers has shifted from the traditional power distribution mode to the power distribution automation mode. Therefore, it is necessary to regularly inspect the status of pole-mounted circuit breakers so that the faulty pole-mounted circuit breaker can be located and maintained in a timely manner after a fault occurs.

[0004] Chinese utility model patent application number 202322533289.0, filed on September 19, 2023, entitled "A Circuit for Detecting Open Circuit in the Control Circuit Between a Power Distribution Terminal and a Circuit Breaker," describes a technical solution. This solution utilizes the principle that one of the circuit breaker's opening and closing signals is always in a conducting state. The different levels of the signal output from the optocoupler circuit to the MCU after a control circuit open circuit is detected allows for the determination of whether a remote control circuit for the circuit breaker's secondary equipment has been opened. However, in practical implementation, this solution requires the MCU to continuously monitor the remote control circuit of the current circuit breaker's secondary equipment. When the number of circuit breaker secondary devices is large, the workload of the MCU becomes significant, and it is also not conducive to the inspection of the power supply system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a pole-mounted circuit breaker control circuit disconnection status inspection system that can be used more flexibly on site and more conducive to realizing pole-mounted circuit breaker inspection by enabling or disabling the detection of disconnection of pole-mounted circuit breakers according to actual needs on site.

[0006] The technical solution adopted by this utility model to solve its technical problem is: the pole-mounted circuit breaker control circuit disconnection status inspection system includes a pole-mounted circuit breaker and a controller, characterized in that: a trigger unit and a feedback unit are also provided, the controller is connected to the trigger unit, the detection power supply passes through the trigger unit, the feedback unit and the coil of the pole-mounted circuit breaker in sequence to form a circuit, and the output end of the feedback unit is connected to the signal input end of the controller.

[0007] Preferably, the triggering unit includes a relay KA2, the controller is connected to the coil of the relay KA2, the detection power is connected to one end of the pole-mounted circuit breaker coil after passing through the normally open contact of the relay KA2 and the triggering unit, and the other end of the pole-mounted circuit breaker coil is grounded.

[0008] Preferably, the feedback unit is an optocoupler chip, the detection power supply passes through the normally open contact of relay KA2 and the input side of the optocoupler chip to connect to the coil of the pole-mounted circuit breaker, and the output side of the optocoupler chip is connected to the controller.

[0009] Preferably, a drive unit is also provided, the output terminal of the controller is connected to the control signal input terminal of the drive unit, and the drive power supply voltage is connected in series with the coil circuit of the drive unit and the pole-mounted circuit breaker.

[0010] Preferably, the drive unit includes a relay KA1, the controller is connected to the coil of the relay KA1, the drive power supply is connected to one end of the pole-mounted circuit breaker coil through the normally open contact of the relay KA1, and the other end of the pole-mounted circuit breaker coil is grounded.

[0011] Preferably, a communication unit is also provided, through which the controller connects to the master station.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this pole-mounted circuit breaker control circuit disconnection status inspection system, a triggering unit and a feedback unit are set up. When it is necessary to judge the disconnection of the pole-mounted circuit breaker, the detection power supply is applied to the coil of the pole-mounted circuit breaker through the triggering unit and the feedback unit, and the judgment result is fed back through the feedback unit. According to the actual needs of the site, the disconnection judgment of the pole-mounted circuit breaker can be enabled or disabled, making the field use more flexible and more conducive to the inspection of the pole-mounted circuit breaker.

[0014] In the control circuit disconnection status inspection system of the pole-mounted circuit breaker, the control circuit status is determined by remote signaling acquisition, which results in lower production costs, stronger anti-interference capabilities, and more reliable operation of the device.

[0015] In the pole-mounted circuit breaker control circuit disconnection status inspection system, a communication unit is set up to facilitate communication with the master station. Attached Figure Description

[0016] Figure 1 This is a block diagram illustrating the principle of a pole-mounted circuit breaker control circuit disconnection status inspection system.

[0017] Figure 2 This is a circuit diagram of a pole-mounted circuit breaker control circuit disconnection status inspection system. Detailed Implementation

[0018] Figures 1-2This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-2 The present invention will be further described below.

[0019] like Figure 1 As shown, a pole-mounted circuit breaker control circuit disconnection status inspection system includes a controller. The signal output terminals of the controller are connected to a triggering unit and a drive unit, respectively. The drive unit is connected to the pole-mounted circuit breaker. The triggering unit is connected to the pole-mounted circuit breaker via a feedback unit. The output terminal of the feedback unit is connected to the signal input terminal of the controller. A positioning unit is connected to the signal input terminal of the controller. The controller's signal input / output ports are also connected to a communication unit, enabling the controller to communicate with the master station.

[0020] Under normal operating conditions, when the pole-mounted circuit breaker needs to operate, the controller controls the coil of the pole-mounted circuit breaker through the control drive unit, thereby controlling the opening and closing of the contacts inside the pole-mounted circuit breaker. When it is necessary to detect the open circuit status of the pole-mounted circuit breaker control circuit, the controller controls the trigger unit to operate, sending an open circuit detection signal to the pole-mounted circuit breaker through the trigger unit. The feedback unit sends the level signal status output by the pole-mounted circuit breaker to the controller, which then judges the open circuit status of the pole-mounted circuit breaker. After an open circuit fault occurs in the pole-mounted circuit breaker, the controller sends the open circuit status of the pole-mounted circuit breaker to the master station through the communication unit.

[0021] Combination Figure 2 Relay KA1 represents the aforementioned drive unit. Terminal IN1 is connected to one end of resistor R1 and one end of the relay KA1 coil. The other end of resistor R1 and the other end of the relay KA1 coil are grounded. A DC 24V voltage is connected in series with the normally open contact KA1-1 of relay KA1 and then connected to one end of coil KA3. The other end of KA3 is grounded. Coil KA3 is the drive coil inside the pole-mounted circuit breaker, and contact KA3-1 is the contact of the pole-mounted circuit breaker.

[0022] Relay KA2 represents the aforementioned trigger unit. Terminal IN2 is connected to one end of resistor R2 and one end of the relay KA2 coil. The other end of resistor R2 and the other end of the relay KA2 coil are grounded. A 24V DC voltage is connected in series with the normally open contact KA2-1 of relay KA2 and then connected to one end of capacitor C1 and the positive input terminal of optocoupler chip U1. The negative output terminal of optocoupler chip U1 is connected to the other end of capacitor C1 and one end of resistor R3. The other end of resistor R3 is connected in parallel with the aforementioned normally open contact KA1-1 and then connected to one end of coil KA3.

[0023] The 5V DC power supply is connected in series with resistor R4, then connected to the positive output of optocoupler chip U1 and one end of capacitor C2, and terminal OUT1 is brought out. The negative output of optocoupler chip U1 and the other end of capacitor C2 are grounded.

[0024] The optocoupler chip U1, capacitors C1-C2, and resistor R4 constitute the aforementioned feedback unit. Terminal OUT1 serves as the output terminal of the feedback unit and is connected to the signal input terminal of the controller. Terminals IN1 and IN2 are respectively connected to the signal output terminals of the controller.

[0025] The specific working process and working principle are as follows:

[0026] Under normal operating conditions, when the pole-mounted circuit breaker needs to operate, the controller sends a control signal to the relay KA1. After the coil of the relay KA1 is switched on and off, the normally open contact KA1-1 closes, and the 24V DC power supply forms a circuit through the normally open contact KA1-1 and the coil KA3. After the coil KA3 is energized, the contacts inside it operate.

[0027] When it is necessary to detect the open circuit status of the control circuit of the pole-mounted circuit breaker, the controller sends a control signal to the relay KA2. After the coil of the relay KA2 is switched on and off, the normally open contact KA2-1 closes, and the 24V DC power supply is sent to the coil KA3 through the normally open contact KA2-1, the input side of the optocoupler chip U1 and the resistor R3.

[0028] When KA3 is not disconnected, its own impedance is negligible, and the coil KA3 is energized to form a circuit. At this time, the current generated in the circuit drives the optocoupler chip U1 to conduct, and the level state of the output terminal of the optocoupler chip U1 is reversed and sent to the controller. If KA3 is disconnected, its own impedance is infinite, and the 24V DC power supply cannot form a circuit. At this time, since the optocoupler chip U1 is not conducting, the level state of its output terminal is not reversed. The controller thus judges that the coil of the pole-mounted circuit breaker is disconnected. At this time, the controller sends the disconnection status of the pole-mounted circuit breaker to the master station through the communication unit.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A pole-mounted circuit breaker control circuit disconnection status inspection system, comprising a pole-mounted circuit breaker and a controller, characterized in that: It is also equipped with a trigger unit and a feedback unit. The controller is connected to the trigger unit. The detection power supply passes through the trigger unit, the feedback unit and the coil of the pole-mounted circuit breaker in sequence to form a circuit. The output terminal of the feedback unit is connected to the signal input terminal of the controller.

2. The pole-mounted circuit breaker control circuit disconnection status inspection system according to claim 1, characterized in that: The triggering unit includes a relay KA2. The controller is connected to the coil of the relay KA2. The detection power supply passes through the normally open contact of the relay KA2 and the triggering unit and is connected to one end of the pole-mounted circuit breaker coil. The other end of the pole-mounted circuit breaker coil is grounded.

3. The pole-mounted circuit breaker control circuit disconnection status inspection system according to claim 2, characterized in that: The feedback unit is an optocoupler chip. The detection power supply passes through the normally open contact of relay KA2 and the input side of the optocoupler chip, which is connected to the coil of the pole-mounted circuit breaker. The output side of the optocoupler chip is connected to the controller.

4. The pole-mounted circuit breaker control circuit disconnection status inspection system according to claim 1, characterized in that: It is also equipped with a drive unit. The output terminal of the controller is connected to the control signal input terminal of the drive unit. The drive power supply voltage is connected in series with the coil circuit of the drive unit and the pole-mounted circuit breaker.

5. The pole-mounted circuit breaker control circuit disconnection status inspection system according to claim 4, characterized in that: The drive unit includes a relay KA1. The controller is connected to the coil of the relay KA1. The drive power supply is connected to one end of the pole-mounted circuit breaker coil through the normally open contact of the relay KA1. The other end of the pole-mounted circuit breaker coil is grounded.

6. The pole-mounted circuit breaker control circuit disconnection status inspection system according to claim 1, characterized in that: A communication unit is also provided, through which the controller connects to the master station.

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