Simulation circuit breaker of adaptive distribution network protection device and debugging method

Abstract

The invention relates to an analog circuit breaker of a self-adaptive distribution network protection device and a debugging method. Comprising a simulation circuit breaker closing control loop connected in series with a distribution network protection device closing loop, a simulation circuit breaker opening control loop connected in series with a distribution network protection device opening loop, and a permanent magnetic mechanism control loop connected in series with a distribution network protection device permanent magnetic mechanism opening and closing control loop. The simulation circuit breaker can adapt to different voltage grades, can achieve on-site debugging without power failure, is high in safety, and meets the requirements of distribution network protection debugging and on-site maintenance application. And a conventional remote control mechanism and a permanent magnet remote control mechanism are compatible, the requirements of various different application scenes are met, and the engineering application requirements of different types of distribution network protection devices are met.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power design, and in particular relates to a simulation circuit breaker and a debugging method of an adaptive distribution network protection device. Background Art

[0002] The safe, stable and efficient operation of the distribution network is one of the key tasks of distribution automation construction. The distribution network protection device can effectively locate and isolate the fault area and quickly restore power supply to the non-fault area. However, there is a lack of unified standards in the industry for the functions, performance, and structure of distribution network protection devices. Depending on the application scenario, different equipment manufacturers have different configurations of distribution network protection devices, and there are differences in power supply methods and remote control / telesignaling input and output nodes. There are many different types of active and passive input and output nodes. Common input voltages of distribution network protection devices include DC220V, DC110V, DC48V, DC24V, etc. Different voltage levels have different design requirements for relay control circuits. Usually, manual jumpers are used to design compatibility with input voltages of different levels.

[0003] In addition, there are a large number of distribution network protection devices, which are installed in scattered locations. Conventional on-site debugging requires debugging all switches at once. During the device debugging and operation inspection, the line needs to be powered off, which is a large workload, takes a long time, and is cumbersome and complicated to repair. Moreover, it is impossible to power off the distribution network protection devices that have been put into operation. At present, conventional analog circuit breakers can only adapt to a single voltage, which is inconvenient to use on site. Summary of the invention

[0004] The first purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a simulated circuit breaker for an adaptive distribution network protection device. The device is compatible with conventional remote control and permanent magnet remote control mechanisms, and can adapt to different voltage levels to replace a primary switch to complete the opening and closing debugging of the distribution network protection device.

[0005] To achieve the above object, the present invention adopts the following technical solution: A simulated circuit breaker of an adaptive distribution network protection device comprises: a simulated circuit breaker closing control circuit connected in series with a closing control circuit of the distribution network protection device, a simulated circuit breaker opening control circuit connected in series with an opening control circuit of the distribution network protection device, and a permanent magnet mechanism control circuit connected in series with a permanent magnet mechanism opening and closing control circuit of the distribution network protection device; The simulated circuit breaker closing control circuit comprises a manual closing switch, a first adaptive voltage regulating circuit, a first coil of a first double-coil magnetic latching relay, and a second coil of a second double-coil magnetic latching relay connected in series in sequence; the first and second contacts of the first double-coil magnetic latching relay act synchronously and output a closing signal when closed; The simulated circuit breaker opening control circuit comprises a manual opening switch, a second adaptive voltage regulating circuit, a second coil of a first double-coil magnetic latching relay, and a first coil of a second double-coil magnetic latching relay connected in series in sequence; the third and fourth contacts of the second double-coil magnetic latching relay act synchronously and output a position opening signal when closed; The permanent magnet mechanism control circuit includes a third adaptive voltage regulating circuit, and two output ends of the third adaptive voltage regulating circuit are respectively connected to the two ends of the coil of the single-coil magnetic latching relay; the fifth and sixth contacts of the single-coil magnetic latching relay act asynchronously, and output a closed position signal or an open position signal according to the closed contact; The first adaptive voltage regulating circuit, the second adaptive voltage regulating circuit and the third adaptive voltage regulating circuit are voltage stabilizing circuits, wherein the output voltages of the first and second adaptive voltage regulating circuits are twice the working voltage of the magnetic latching relay, and the output voltage of the third adaptive voltage regulating circuit is consistent with the working voltage of the magnetic latching relay.

[0006] As a preferred implementation, it further includes a fourth adaptive voltage regulating circuit; the output voltage of the fourth adaptive voltage regulating circuit is consistent with the working voltage of the magnetic latching relay; One end of the first contact and the fourth contact is connected to the output end of the fourth adaptive voltage regulation circuit, and the other end is connected to the negative pole of the power supply; one end of the second contact and the third contact is connected to the power distribution terminal, and the other end outputs the remote signal.

[0007] As a preferred implementation, the first adaptive voltage regulating circuit and the second adaptive voltage regulating circuit have the same structure, and the third adaptive voltage regulating circuit comprises two reverse-connected voltage regulators in series.

[0008] As a preferred implementation, the first adaptive voltage regulating circuit and the second adaptive voltage regulating circuit are series transistor voltage stabilizing circuits.

[0009] As a preferred implementation, the fourth adaptive voltage regulating circuit is a series transistor voltage stabilizing circuit, and a current limiting resistor R3-2 is additionally provided at the output end of the transistor.

[0010] As a preferred implementation, the single-coil and double-coil magnetic latching relay is powered by a common end of a remote signal output circuit of a distribution network protection device.

[0011] As a preferred implementation, the third adaptive voltage regulation circuit comprises two reverse-connected voltage regulators, a current-limiting resistor connected in series with the voltage regulators, and a capacitor connected in parallel at both ends of the voltage regulators.

[0012] As a preferred implementation, the first contact and the second contact of the first double-coil magnetic latching relay are respectively connected in series with a first closing indicator light and a second closing indicator light; The third contact and the fourth contact of the second double-coil magnetic latching relay are respectively connected in series with the first opening indicator light and the second opening indicator light; The fifth contact and the sixth contact of the single-coil magnetic latching relay are respectively connected to the second opening indicator light and the second closing indicator light; The closing indicator light and the opening indicator light are connected to the remote signal output circuit of the distribution network protection device; Among them, the first closing indicator light and the first opening indicator light are respectively connected to the negative pole of the power supply, and the second closing indicator light and the second opening indicator light respectively output a remote signal closing signal and a remote signal opening signal.

[0013] Another object of the present invention is to provide a method for performing opening and closing debugging of a distribution network protection device using the above-mentioned simulated circuit breaker. After the circuit breaker simulator is powered on, the distribution network protection debugging is performed through the opening / closing switch or through the opening and closing control signal of the permanent magnet mechanism.

[0014] As a preferred implementation, the debugging process also includes relay initial state detection: After the fourth adaptive voltage regulation circuit is powered on, the initial state of the second double-coil magnetic latching relay is determined according to the first opening indicator light, and the initial state of the first double-coil magnetic latching relay is determined according to the first closing indicator light; If the indicator light is on, the initial state of the relay is normally closed, otherwise it is normally open; If the first and second double-coil magnetic latching relays are both in the normally closed state, the initial state of the relay is preset through the opening control circuit.

[0015] The present invention has the following beneficial effects: (1) The simulated circuit breaker of the present invention can adapt to different voltage levels, and there is no need for manual judgment of the power supply voltage of the distribution network protection device. It has high safety and meets the application requirements of distribution network protection debugging and maintenance on site.

[0016] (2) The simulated circuit breaker of the present invention is compatible with conventional remote control and permanent magnet remote control mechanisms, adapts to the needs of various different application scenarios, and meets the engineering application requirements of different types of distribution network protection devices.

[0017] (3) The simulated circuit breaker of the present invention can realize on-site non-stop debugging, which is convenient for debugging and maintenance of complex functions of power distribution automation, and reduces the debugging workload and testing time of on-site power distribution terminals. Especially for the FA debugging of the entire line, the application is more convenient and quick, and the operation and inspection efficiency is improved.

[0018] (4) The simulated circuit breaker of the present invention has a relay initial state position detection function, which is convenient for operation and maintenance personnel to identify the initial state of the relay and ensure that the circuit breaker is in a normally open state when the terminal is connected, thereby improving the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the design principle of the adaptive analog circuit breaker.

[0020] Figure 2 It is a schematic diagram of the circuit structure of an adaptive simulated circuit breaker. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The design principle of the simulated circuit breaker of the present invention is as follows Figure 1 As shown, it is mainly composed of a manual opening / closing switch, an adaptive voltage regulation circuit, a conventional opening / closing control circuit, a permanent magnet mechanism opening / closing control circuit and a signal output circuit. The signal output circuit is the conventional closing signal and opening signal of the distribution network protection device (terminal) and the closing signal and opening signal of the permanent magnet mechanism. The adaptive analog circuit breaker is connected in series in the opening / closing circuit of the distribution network protection device, and uses the input voltage of the distribution network protection device as its own working voltage. The adaptive voltage regulation circuit stabilizes the voltage within the working voltage level range of the opening / closing control circuit to drive the relay to realize the opening / closing state conversion of the output device. The analog circuit breaker is equipped with an opening / closing indicator light, which is convenient for engineering personnel to view the current status of the device and perform debugging and maintenance.

[0023] Combine the following Figure 2 The circuit design and functions of each part of the simulated circuit breaker are described as follows: The conventional opening / closing control circuit adopts a double-coil magnetic latching relay (JD1, JD2) design, which is realized by manual opening / closing switch control. The opening / closing indicator light (LED1, LED2, LED3, LED4) displays the current status of the device, which is convenient for engineering personnel to debug.

[0024] The permanent magnet mechanism opening / closing control circuit is used to detect and control the opening and closing of the permanent magnet mechanism of the distribution network protection device. It adopts a single-coil magnetic latching relay design. The operating status of the device is displayed by the opening / closing indicator light (LED2, LED4), which is convenient for engineering personnel to detect and debug the permanent magnet module of the distribution network protection device.

[0025] Both the conventional opening / closing control circuit and the permanent magnet mechanism opening / closing control circuit are equipped with adaptive voltage regulation circuits for adaptive voltage regulation. The adaptive voltage regulation circuits are divided into conventional adaptive voltage regulation circuits and permanent magnet mechanism adaptive voltage regulation circuits, which are used to stabilize input voltages of different levels (DC220, DC110, DC48, DC24, etc.) at the voltage level required by the simulated circuit breaker opening / closing control circuit.

[0026] Figure 2 The simulated circuit breaker shown includes two adaptive voltage regulating circuits (the closing control circuit is referred to as the first adaptive voltage regulating circuit, and the opening control circuit is referred to as the second adaptive voltage regulating circuit) for simulating the opening and closing control circuits of the circuit breaker, which are used to supply power to the coils of the double-coil magnetic latching relays JD1 and JD2. The two adaptive voltage regulating circuits have the same structure and are both series transistor voltage regulator circuits. The adaptive voltage regulating circuit (the fourth adaptive voltage regulating circuit) for powering JD1 and JD2 is equipped with a current limiting resistor R3-2. The output voltage is still 24V, but the circuit current is reduced by the current limiting resistor. The adaptive voltage regulating circuit (the third adaptive voltage regulating circuit) of the permanent magnet mechanism is composed of two reverse series-connected voltage regulators, a current limiting resistor connected in series with the voltage regulators, and a capacitor connected in parallel at both ends of the voltage regulators.

[0027] The manual closing switch, the first adaptive voltage regulation circuit, the first coil of JD1, and the second coil of JD2 in the closing control circuit are connected in series in sequence; the manual opening switch, the second adaptive voltage regulation circuit, the second coil of JD1, and the first coil of JD2 in the opening control circuit are connected in series in sequence; the energized contacts of the first coils in JD1 and JD2 are closed, and the energized contacts of the second coils are opened, and the two contacts in JD1 and 2 act synchronously (synchronously closed / opened).

[0028] The fourth adaptive voltage regulation circuit in the permanent magnet control loop is a bidirectional voltage stabilization circuit. When a forward voltage is applied, the forward conduction voltage drop of D4-1 is 0.7V, and the reverse breakdown voltage of D4-2 is stabilized at 24V. When a reverse voltage is applied, the reverse breakdown voltage drop of D4-1 is 24V, and the forward conduction voltage of D4-2 is stabilized at 0.7V. The single-coil magnetic latching relay JD3 controls the asynchronous closure of the two contacts (i.e. one is closed and the other is open) according to the current direction on the coil.

[0029] Figure 2 D1 and D2 are 48V voltage regulators, D3, D4-1 and D4-2 are 24V voltage regulators, R is a resistor, C is a capacitor, and the signal descriptions are as follows: (1) U+ and U- are analog circuit breaker input voltages, usually DC220V, DC110V, DC48V, DC24V; (2) SW-H and SW-F are closing switches and opening switches for simulating the conventional opening / closing control circuit of the circuit breaker; (3) HZ+, HZ-, FZ+ and FZ- are the signals for simulating the conventional closing and opening control circuits of the circuit breaker. They are implemented by using a 24V double-coil magnetic latching relay and are connected in series with the conventional closing and opening circuits of the distribution network protection device. (4) MAG+ and MAG- are signals for simulating the opening and closing circuit of the permanent magnetic mechanism of the circuit breaker. They are implemented by using a 24V single-coil magnetic latching relay and are connected in series with the opening and closing control circuit of the permanent magnetic mechanism of the distribution network protection device. (5) YX-COM is the common terminal (+) of the remote signal output signal of the opening and closing circuit, YX-H is the closed signal (-) of the simulated circuit breaker remote signal output, and YX-F is the open signal (-) of the simulated circuit breaker remote signal output. The YX-COM, YX-H and YX-F of the simulated circuit breaker are connected in series with the remote signal output circuit of the distribution network protection device.

[0030] The specific operations and implementation principles are as follows: After the simulated circuit breaker is powered on, the power supply voltage of the simulated circuit breaker is stabilized at about 24V through the adaptive voltage regulation circuit, and the indicator LED2 is always on. In the conventional opening / closing control circuit, the debugging personnel use the SW-H closing switch to drive the relay JD1 to operate, JD2 to reset, the indicator LED2 to go out, and the simulated circuit breaker closing indicator LED3 and LED4 to stay on. At this time, the distribution network protection device SOE information displays the remote signal closing information; through the SW-F opening switch, the relay JD1 is driven to reset, JD2 to operate, the simulated circuit breaker LED1 and LED2 to stay on, LED3 and LED4 to go out, and the distribution network protection device SOE information displays the remote signal opening information. The permanent magnet mechanism of the distribution network protection device is usually DC220V. In the permanent magnet mechanism opening and closing control circuit, the permanent magnet mechanism adaptive voltage regulation circuit stabilizes the voltage at about DC24V, driving the relay JD3 to operate. At this time, the simulated circuit breaker LED4 is always on, and the distribution network protection device SOE displays the permanent magnet closing position information; when the permanent magnet voltage reverses, the relay JD3 resets, and the simulated circuit breaker LED2 is always on, and the distribution network protection device SOE displays the permanent magnet opening position information.

Claims

1. A simulated circuit breaker of an adaptive distribution network protection device, characterized in that: include: A simulated circuit breaker closing control circuit connected in series with the closing circuit of the distribution network protection device, a simulated circuit breaker opening control circuit connected in series with the opening circuit of the distribution network protection device, and a permanent magnet mechanism control circuit connected in series with the permanent magnet mechanism opening and closing control circuit of the distribution network protection device; The simulated circuit breaker closing control circuit comprises a manual closing switch, a first adaptive voltage regulating circuit, a first coil of a first double-coil magnetic latching relay, and a second coil of a second double-coil magnetic latching relay connected in series in sequence; the first and second contacts of the first double-coil magnetic latching relay act synchronously and output a closing signal when closed; The simulated circuit breaker opening control circuit comprises a manual opening switch, a second adaptive voltage regulating circuit, a second coil of a first double-coil magnetic latching relay, and a first coil of a second double-coil magnetic latching relay connected in series in sequence; the third and fourth contacts of the second double-coil magnetic latching relay act synchronously and output a position opening signal when closed; The permanent magnet mechanism control circuit includes a third adaptive voltage regulating circuit, and two output ends of the third adaptive voltage regulating circuit are respectively connected to the two ends of the coil of the single-coil magnetic latching relay; the fifth and sixth contacts of the single-coil magnetic latching relay act asynchronously, and output a closed position signal or an open position signal according to the closed contact; The first adaptive voltage regulating circuit, the second adaptive voltage regulating circuit and the third adaptive voltage regulating circuit are voltage stabilizing circuits, wherein the output voltages of the first and second adaptive voltage regulating circuits are twice the working voltage of the magnetic latching relay, and the output voltage of the third adaptive voltage regulating circuit is consistent with the working voltage of the magnetic latching relay.

2. The simulated circuit breaker according to claim 1, characterized in that: Also included is a fourth adaptive voltage regulation circuit; The output voltage of the fourth adaptive voltage regulating circuit is consistent with the operating voltage of the magnetic latching relay; One end of the first contact and the fourth contact is connected to the output end of the fourth adaptive voltage regulation circuit, and the other end is connected to the negative pole of the power supply; one end of the second contact and the third contact is connected to the power distribution terminal, and the other end outputs the remote signal.

3. The simulated circuit breaker according to claim 1, characterized in that: The first adaptive voltage regulating circuit and the second adaptive voltage regulating circuit have the same structure, and the third adaptive voltage regulating circuit comprises two voltage regulator tubes connected in reverse series.

4. The simulated circuit breaker according to claim 1 or 3, characterized in that: The first adaptive voltage regulating circuit and the second adaptive voltage regulating circuit are series transistor voltage stabilizing circuits.

5. The simulated circuit breaker according to claim 2 or 3, characterized in that: The fourth adaptive voltage regulating circuit is a series transistor voltage stabilizing circuit, and a current limiting resistor R3-2 is additionally provided at the output end of the transistor.

6. The simulated circuit breaker according to claim 1, characterized in that: The single-coil and double-coil magnetic latching relay is powered by the common end of the remote signal output circuit of the distribution network protection device.

7. The simulated circuit breaker according to claim 1, characterized in that: The third adaptive voltage regulation circuit comprises two voltage regulator tubes connected in reverse series, a current limiting resistor connected in series with the voltage regulator tubes, and a capacitor connected in parallel at both ends of the voltage regulator tubes.

8. The simulated circuit breaker according to claim 1, characterized in that: The invention also includes that the first contact and the second contact of the first double-coil magnetic latching relay are respectively connected in series with a first closing indicator light and a second closing indicator light; The third contact and the fourth contact of the second double-coil magnetic latching relay are respectively connected in series with the first opening indicator light and the second opening indicator light; The fifth contact and the sixth contact of the single-coil magnetic latching relay are respectively connected to the second opening indicator light and the second closing indicator light; The closing indicator light and the opening indicator light are connected to the remote signal output circuit of the distribution network protection device; Among them, the first closing indicator light and the first opening indicator light are respectively connected to the negative pole of the power supply, and the second closing indicator light and the second opening indicator light respectively output a remote signal closing signal and a remote signal opening signal.

9. A method for debugging the opening and closing of a distribution network protection device using the simulated circuit breaker according to any one of claims 1 to 3, 6 to 8, characterized in that: After the circuit breaker simulator is powered on, the distribution network protection is debugged through the opening / closing switch or the opening / closing control signal of the permanent magnetic mechanism.

10. The method according to claim 9, characterized in that Also includes relay initial state detection: After the fourth adaptive voltage regulation circuit is powered on, the initial state of the second double-coil magnetic latching relay is determined according to the first opening indicator light, and the initial state of the first double-coil magnetic latching relay is determined according to the first closing indicator light; If the indicator light is on, the initial state of the relay is normally closed, otherwise it is normally open; If the first and second double-coil magnetic latching relays are both in the normally closed state, the initial state of the relay is preset through the opening control circuit.

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