Analog circuit breaker of adaptive network protection device and debugging method

Abstract

The application relates to a simulation circuit breaker of an adaptive distribution network protection device and a debugging method, which comprises a simulation circuit breaker closing control loop in series with a closing loop of the distribution network protection device, a simulation circuit breaker opening control loop in series with an opening loop of the distribution network protection device, and a permanent magnet mechanism control loop in series with a permanent magnet mechanism closing / opening control loop of the distribution network protection device. The simulation circuit breaker of the application can be self-adaptive to different voltage grades, can realize on-site debugging without power interruption, is high in safety, meets the application requirements of distribution network protection debugging and on-site maintenance, is compatible with conventional remote control and permanent magnet remote control mechanisms, is adaptive to various different application scene requirements, and meets the engineering application requirements of different types of distribution network protection devices.

Description

Technical Field

[0001] The present 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 distribution networks is a key task in the development of distribution automation. Distribution network protection devices can effectively locate and isolate faulty areas and quickly restore power to non-faulty areas. However, there is a lack of unified industry standards for the functions, performance, and structure of distribution network protection devices. Depending on the application scenario, different equipment manufacturers configure distribution network protection devices differently. There are also differences in power supply methods and remote control / telesignaling input and output nodes, and there are many different types of active and passive input and output nodes. Common input voltages for distribution network protection devices include DC220V, DC110V, DC48V, and DC24V. Different voltage levels have different design requirements for relay control circuits, and manual jumpers are often used to design compatibility with different input voltage levels.

[0003] Furthermore, the distribution network protection devices are numerous and dispersed across the network. Conventional on-site commissioning requires debugging all switches simultaneously, requiring power outages during commissioning and maintenance. This creates a heavy workload, is time-consuming, and makes maintenance tedious and complex. Furthermore, power outages cannot be performed on already operational distribution network protection devices. Conventional analog circuit breakers currently accommodate only a single voltage, making them inconvenient for field use. 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 solutions:

[0006] 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;

[0007] The simulated circuit breaker closing control circuit includes a manual closing switch, a first adaptive voltage regulation 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. The first and second contacts of the first double-coil magnetic latching relay operate synchronously and output a closing signal when closed.

[0008] The simulated circuit breaker opening control circuit includes a manual opening switch, a second adaptive voltage regulation 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; the third and fourth contacts of the second double-coil magnetic latching relay operate synchronously and output a trip signal when closed;

[0009] The permanent magnet mechanism control circuit includes a third adaptive voltage regulation circuit, the two output ends of the third adaptive voltage regulation 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 operate asynchronously, and output a closed position signal or an open position signal according to the closed contact;

[0010] The first adaptive voltage regulation circuit, the second adaptive voltage regulation circuit, and the third adaptive voltage regulation circuit are voltage stabilizing circuits, wherein the output voltages of the first and second adaptive voltage regulation circuits are twice the operating voltage of the magnetic latching relay, and the output voltage of the third adaptive voltage regulation circuit is consistent with the operating voltage of the magnetic latching relay.

[0011] As a preferred embodiment, it further includes a fourth adaptive voltage regulating circuit; the output voltage of the fourth adaptive voltage regulating circuit is consistent with the operating voltage of the magnetic latching relay;

[0012] 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.

[0013] As a preferred embodiment, 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.

[0014] As a preferred implementation, the first adaptive voltage regulation circuit and the second adaptive voltage regulation circuit are series transistor voltage stabilization circuits.

[0015] As a preferred implementation, the fourth adaptive voltage regulation circuit is a series transistor voltage stabilization circuit, and a current limiting resistor R3-2 is additionally provided at the output end of the transistor.

[0016] As a preferred embodiment, 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.

[0017] As a preferred embodiment, the third adaptive voltage regulation circuit comprises two voltage regulators connected in reverse series, a current limiting resistor connected in series with the voltage regulators, and a capacitor connected in parallel at both ends of the voltage regulators.

[0018] As a preferred embodiment, 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;

[0019] 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;

[0020] The fifth contact and the sixth contact of the single-coil magnetic latching relay are connected to the second opening indicator light and the second closing indicator light respectively;

[0021] The closing indicator light and the opening indicator light are connected to the remote signal output circuit of the distribution network protection device;

[0022] 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 remote signal closing signal and remote signal opening signal.

[0023] Another object of the present invention is to provide a method for debugging the opening and closing 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 the opening and closing control signal of the permanent magnet mechanism.

[0024] As a preferred embodiment, the debugging process further includes relay initial state detection:

[0025] 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;

[0026] If the indicator light is on, the relay initial state is normally closed, otherwise it is normally open;

[0027] If the first and second double-coil magnetic latching relays are both in the normally closed state, the initial state of the relays is preset through the opening control circuit.

[0028] The present invention has the following beneficial effects:

[0029] (1) The simulated circuit breaker of the present invention can adapt to different voltage levels, eliminating the need for manual judgment of the power supply voltage of the distribution network protection device. It is highly safe and meets the requirements of on-site application of distribution network protection debugging and maintenance.

[0030] (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.

[0031] (3) The simulated circuit breaker of the present invention can realize on-site debugging without power outage, which is convenient for debugging and maintenance of complex functions of distribution automation, and reduces the debugging workload and testing time of on-site distribution terminals. Especially for the FA debugging of the entire line, the application is more convenient and quick, and the operation and maintenance efficiency is improved.

[0032] (4) The simulated circuit breaker of the present invention has a relay initial state position detection function, which makes it easier for operation and maintenance personnel to identify the initial state of the relay and ensure that the circuit breaker is in the normally open state when the terminal is connected, thereby improving the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the design principle of the adaptive simulation circuit breaker.

[0034] Figure 2 It is a schematic diagram of the circuit structure of the adaptive simulated circuit breaker. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0036] The design principle of the simulated circuit breaker of the present invention is as follows Figure 1 As shown, the device primarily consists 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 transmits the conventional closing and opening signals of the distribution network protection device (terminal) and the closing and opening signals of the permanent magnet mechanism. The adaptive simulated circuit breaker is connected in series with the opening / closing circuit of the distribution network protection device. It uses the input voltage of the distribution network protection device as its operating voltage. The adaptive voltage regulation circuit stabilizes the voltage within the operating voltage range of the opening / closing control circuit, driving a relay to achieve the opening / closing state transition of the output device. The simulated circuit breaker features an open / closed indicator light, allowing engineers to easily check the current status of the device for debugging and maintenance.

[0037] The following combination Figure 2 The circuit design and functions of each part of the simulated circuit breaker are described as follows:

[0038] The conventional opening / closing control circuit adopts a dual-coil magnetic latching relay (JD1, JD2) design and is implemented through manual opening / closing switch control. The opening / closing indicator lights (LED1, LED2, LED3, LED4) display the current status of the device, facilitating debugging by engineers.

[0039] The permanent magnet mechanism opening / closing control circuit is used for detecting and controlling the opening and closing of the permanent magnet mechanism of the distribution network protection device, is designed by using a single coil magnetic latching relay, and the operation state of the device is displayed by the opening / closing indicator light (LED2, LED4), so as to facilitate the detection and debugging of the permanent magnet module of the distribution network protection device by engineering personnel.

[0040] The conventional opening / closing control circuit and the permanent magnet mechanism opening / closing control circuit are both provided with adaptive voltage regulating circuits for adaptive voltage regulation, the adaptive voltage regulating circuits are divided into conventional adaptive voltage regulating circuits and permanent magnet mechanism adaptive voltage regulating circuits, and are used for stabilizing different levels of input voltages (DC220, DC110, DC48, DC24, etc.) at the voltage level required by the analog circuit breaker opening / closing control circuit.

[0041] Figure 2 The analog circuit breaker shown includes two adaptive voltage regulating circuits of the analog circuit breaker opening / closing control circuit (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), which are used for supplying power to the coils of the double coil magnetic latching relay JD1 and JD2, the two adaptive voltage regulating circuits are the same in structure and are both series transistor voltage regulating circuits. The adaptive voltage regulating circuit (the fourth adaptive voltage regulating circuit) for supplying power to JD1 and JD2 is additionally provided with a current limiting resistor R3-2, and 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 stabilizing tubes, a current limiting resistor connected in series with the stabilizing tubes, and a capacitor connected in parallel across the stabilizing tubes.

[0042] In the closing control circuit, the manual closing switch, the first adaptive voltage regulating circuit, the first coil of JD1 and the second coil of JD2 are connected in series, in the opening control circuit, the manual opening switch, the second adaptive voltage regulating circuit, the second coil of JD1 and the first coil of JD2 are connected in series, the first coil of JD1 and JD2 is connected to the power-on contact and the second coil is connected to the power-off contact, and the two contacts in JD1 and JD2 are synchronously operated (synchronously closed / opened).

[0043] In the permanent magnet control circuit, the fourth adaptive voltage regulating circuit is a bidirectional voltage regulating circuit, when a forward voltage is applied, D4-1 is forwardly conducted with a voltage drop of 0.7V, and D4-2 is reversely broken with a voltage of 24V, when a reverse voltage is applied, D4-1 is reversely broken with a voltage drop of 24V, and D4-2 is forwardly conducted with a voltage of 0.7V, and the single coil magnetic latching relay JD3 controls the two contacts to be asynchronously closed (one is closed and the other is opened) according to the current direction of the coil.

[0044] Figure 2D1 and D2 are 48V voltage regulator tubes, D3, D4-1 and D4-2 are 24V voltage regulator tubes, R is a resistor, and C is a capacitor. The description of each signal is as follows:

[0045] (1) U+ and U- are analog circuit breaker input voltages, usually DC220V, DC110V, DC48V, or DC24V;

[0046] (2) SW-H and SW-F are the closing switch and opening switch of the conventional opening / closing control circuit of the simulated circuit breaker;

[0047] (3) HZ+, HZ-, FZ+ and FZ- are the signals for simulating the conventional closing and opening control circuits of the circuit breaker, which are implemented by 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;

[0048] (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.

[0049] (5) YX-COM is the common terminal (+) of the remote signal output signal of the opening and closing circuit, YX-H is the remote signal output closing signal of the simulated circuit breaker (-), and YX-F is the remote signal output opening signal of the simulated circuit breaker (-). 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.

[0050] The specific operations and implementation principles are as follows:

[0051] After the simulated circuit breaker is powered on, the adaptive voltage regulation circuit stabilizes the simulated circuit breaker's supply voltage at approximately 24V, and indicator LED2 remains on. In the conventional open / close control circuit, commissioning personnel activate the SW-H closing switch, actuating relay JD1 and resetting JD2. LED2 turns off, and the simulated circuit breaker's closing indicators, LED3 and LED4, remain on. The distribution network protection device's SOE information displays the remote signaling closed position. Using the SW-F opening switch, relay JD1 is reset, actuating JD2, and the simulated circuit breaker's LED1 and LED2 remain on, while LED3 and LED4 turn off. The distribution network protection device's SOE information displays the remote signaling open position. 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 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, 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 for 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 opening and closing control circuit of the permanent magnet mechanism of the distribution network protection device; The simulated circuit breaker closing control circuit includes a manual closing switch, a first adaptive voltage regulation 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. The first and second contacts of the first double-coil magnetic latching relay operate synchronously and output a closing signal when closed. The simulated circuit breaker opening control circuit includes a manual opening switch, a second adaptive voltage regulation 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; the third and fourth contacts of the second double-coil magnetic latching relay operate synchronously and output a trip signal when closed; The permanent magnet mechanism control circuit includes a third adaptive voltage regulation circuit, the two output ends of the third adaptive voltage regulation 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 operate asynchronously, and output a closed position signal or an open position signal according to the closed contact; 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 electrode 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; 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 operating voltage of the magnetic latching relay, and the output voltages of the third and fourth adaptive voltage regulating circuits are consistent with the operating voltage of the magnetic latching relay; 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 fourth contact and the third 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 connected to the second opening indicator light and the second closing indicator light respectively; 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 remote signal closing signal and remote signal opening signal.

2. 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.

3. The simulated circuit breaker according to claim 1 or 2, characterized in that: The first adaptive voltage regulating circuit and the second adaptive voltage regulating circuit are series transistor voltage stabilizing circuits.

4. The simulated circuit breaker according to claim 1 or 2, 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.

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

6. 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.

7. A debugging method for a simulated circuit breaker of an adaptive distribution network protection device, characterized in that: After the simulated circuit breaker according to any one of claims 1 to 6 is powered on, distribution network protection debugging is performed through the opening / closing switch or the opening / closing control signal of the permanent magnet mechanism.

8. The method according to claim 7, 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 relay initial state 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 relays is preset through the opening control circuit.

Images