Low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit and control device

Abstract

The utility model discloses a low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit and a control device. The low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit comprises a processor with an ARM framework, three groups of optocoupler circuits, a voltage sampling circuit, a switch state sampling circuit and a plurality of groups of relay output signal circuits. The processor is connected with three low-voltage automatic switches and can control two of the three low-voltage automatic switches to be switched on synchronously; the three groups of optocoupler circuits are connected to the three low-voltage automatic switches in a one-to-one manner; the voltage sampling circuit is connected to the processor; and the switch state sampling circuit is connected to the processor. The low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit provided by the utility model can realize switch operation simplification and guarantee safe use of power distribution.

Description

Technical Field

[0001] The utility model relates to power distribution automation of a power grid, in particular to an electronic three-lock and two-key anti-misoperation circuit and a control device for a low-voltage automatic switch. Background Art

[0002] A dual-main transformer distribution room has three frame-type circuit breakers: one on the low-voltage side of each transformer and one on the bus tie. The opening or closing of these three frame-type circuit breakers determines the distribution room's power supply and operation mode, as well as the mode for power outages and maintenance. To ensure safe operation, distribution rooms are typically equipped with a mechanical three-lock, two-key system. This means each of the three circuit breakers is equipped with a keylock accessory for locking the circuit breaker in the open position. Closing is permitted only when a key is inserted. Because there are only two keys, only two of the three circuit breakers can be closed simultaneously.

[0003] Since mechanical locks are complicated to install and the operation of each switch is also cumbersome, it is necessary to improve the circuit structure of the traditional mechanical three-lock and two-key system. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the technical problem to be solved by the present invention is to provide a low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit and control device. The purpose of designing the anti-misoperation circuit is to simplify the switch operation and ensure the safe use of power distribution.

[0005] In order to solve the above technical problems, the present invention is implemented through the following scheme: The present invention is a low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit, comprising:

[0006] A processor with an ARM architecture, the processor being connected to three low-voltage automatic switches, and the processor being capable of controlling the synchronous closing of two of the three low-voltage automatic switches;

[0007] Three sets of optocoupler circuits, the three sets of optocoupler circuits are connected one to one to three low-voltage automatic switches;

[0008] a voltage sampling circuit connected to the processor;

[0009] A switch state sampling circuit is connected to the processor, and the switch state sampling circuit collects the voltage value and phase on both sides of the low-voltage automatic switch, the current flowing through the low-voltage automatic switch, and the state of the low-voltage automatic switch in real time;

[0010] Multiple groups of relay output signal circuits, any group of relay output signal circuits in the multiple groups of relay output signal circuits are controlled by a processor, and each relay automatically controls the opening and closing of multiple switches in steps by receiving the processor signal.

[0011] Furthermore, the processor is a single chip microcomputer, and its model is STM32F051.

[0012] Furthermore, the three low-voltage automatic switches are set as local switches, auxiliary I switches, and auxiliary II switches;

[0013] The local switch is connected to the first optocoupler circuit;

[0014] The auxiliary I switch is connected to the second optocoupler circuit;

[0015] The auxiliary II switch is connected to a third optocoupler circuit.

[0016] Furthermore, the first optocoupler circuit includes a resistor R201 and an optocoupler U201;

[0017] The first end of the resistor R201 is connected to the local switch output terminal YX0, the second end of the resistor R201 is connected to the positive electrode of the light-emitting end of the optical coupler U201, and the negative electrode of the light-emitting end of the optical coupler U201 is connected to the DIGND ground line;

[0018] The collector of the light-receiving end of the optical coupler U201 is connected to the DIO pin of the processor, and the emitter of the light-receiving end is connected to the DGND ground line.

[0019] Furthermore, the second optocoupler circuit includes a resistor R202 and an optocoupler U202;

[0020] The first end of the resistor R202 is connected to the auxiliary I switch output terminal YX1, the second end of the resistor R202 is connected to the positive electrode of the light-emitting end of the optical coupler U202, and the negative electrode of the light-emitting end of the optical coupler U202 is connected to the DIGND ground line;

[0021] The light receiving end collector of the optical coupler U202 is connected to the DI1 pin of the processor, and the light receiving end emitter thereof is connected to the DGND ground line.

[0022] Furthermore, the third optocoupler circuit includes a resistor R203 and an optocoupler U203;

[0023] The first end of the resistor R203 is connected to the auxiliary II switch output terminal YX2, the second end of the resistor R203 is connected to the positive electrode of the light-emitting end of the optical coupler U203, and the negative electrode of the light-emitting end of the optical coupler U203 is connected to the DIGND ground line;

[0024] The light receiving end collector of the optical coupler U203 is connected to the DI2 pin of the processor, and the light receiving end emitter thereof is connected to the DGND ground line.

[0025] The utility model provides a control device, which comprises the low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The utility model low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit can simplify the switch operation and ensure the safe use of power distribution.

[0028] 2. This utility model's electronic three-lock, two-key anti-misoperation circuit for low-voltage automatic switches uses the voltage and phase values ​​on both sides of the switches, as well as the status of the low-voltage automatic switches, to ensure that only two of the three low-voltage automatic switches are closed simultaneously. The output relay contacts are fed into the low-voltage automatic switch closing circuit. If the relay contacts are closed, closing is enabled; otherwise, closing is prohibited. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a principle block diagram of the automatic switch electronic three-lock two-key anti-misoperation circuit of this utility model.

[0030] Figure 2 This is a diagram defining the pins of the processor of the present invention.

[0031] Figure 3 This is a three-phase circuit connection structure diagram for accessing power supply of the utility model.

[0032] Figure 4 This is the operational amplifier conditioning circuit diagram of this utility model.

[0033] Figure 5 This is the circuit diagram of three groups of optocouplers of the utility model.

[0034] Figure 6 This is a schematic diagram of the three low-voltage automatic switches connected to the system of the utility model.

[0035] Markings in the accompanying drawings: voltage sampling circuit 1, switch state sampling circuit 2, first controller 3, second controller 4, third controller 5. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more specific definition of the scope of protection of the present invention. Obviously, the embodiments described in the present invention are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] 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.

[0038] Example 1: The specific structure of the utility model is as follows:

[0039] Please refer to the attached Figure 1-5 The present invention provides an electronic three-lock, two-key anti-misoperation circuit for a low-voltage automatic switch. The circuit comprises an ARM-based processor, three optocoupler circuits, a voltage sampling circuit, a switch state sampling circuit, and multiple relay output signal circuits. The processor is connected to three low-voltage automatic switches and can control the synchronous closing of two of them. The processor is an STM32F051 single-chip microcomputer.

[0040] The three groups of optocoupler circuits are connected one-to-one to three low-voltage automatic switches. The three low-voltage automatic switches are respectively configured as a local switch, an auxiliary I switch, and an auxiliary II switch. The local switch is connected to the first optocoupler circuit; the auxiliary I switch is connected to the second optocoupler circuit; and the auxiliary II switch is connected to the third optocoupler circuit.

[0041] The first optocoupler circuit includes a resistor R201 and an optocoupler U201; the first end of the resistor R201 is connected to the local switch output terminal YX0, the second end of the resistor R201 is connected to the positive electrode of the light-emitting end of the optocoupler U201, and the negative electrode of the light-emitting end of the optocoupler U201 is connected to the DIGND ground line; the collector of the light-receiving end of the optocoupler U201 is connected to the DIO pin of the processor, and the emitter of the light-receiving end is connected to the DGND ground line.

[0042] The second optocoupler circuit includes a resistor R202 and an optocoupler U202; the first end of the resistor R202 is connected to the auxiliary I switch output terminal YX1, the second end of the resistor R202 is connected to the positive electrode of the light-emitting end of the optocoupler U202, and the negative electrode of the light-emitting end of the optocoupler U202 is connected to the DIGND ground line; the collector of the light-receiving end of the optocoupler U202 is connected to the DI1 pin of the processor, and the emitter of the light-receiving end is connected to the DGND ground line.

[0043] The third optocoupler circuit includes a resistor R203 and an optocoupler U203; the first end of the resistor R203 is connected to the auxiliary II switch output terminal YX2, the second end of the resistor R203 is connected to the positive electrode of the light-emitting end of the optocoupler U203, and the negative electrode of the light-emitting end of the optocoupler U203 is connected to the DIGND ground line; the collector of the light-receiving end of the optocoupler U203 is connected to the DI2 pin of the processor, and the emitter of the light-receiving end is connected to the DGND ground line.

[0044] The voltage sampling circuit 1 is connected to the processor; the electrical input terminal of the current and voltage sampling circuit 1 is connected to a three-phase power supply, and a current limiting resistor is connected to the A phase circuit of the three-phase power supply, such as Figure 3 As shown. The three-phase power supply has 12 phase voltages, which are isolated by voltage transformers. Figure 3As shown, Figure 3 Six sets of voltage transformers T301~T306 are set in the circuit. After the six sets of voltage transformers T301~T306 isolate the power supply, their output terminals are connected to the operational amplifier conditioning circuit, such as Figure 4 shown.

[0045] The voltage sampling circuit 1 includes a current limiting circuit connected to a power supply, a voltage mutual inductance isolation circuit connected to the output end of the current limiting circuit, an operational amplifier conditioning circuit connected to the output end of the voltage mutual inductance isolation circuit, and a filter circuit connected to the output end of the operational amplifier conditioning circuit.

[0046] like Figure 4 As shown, the op amp conditioning circuit includes a first op amp and a first resistor. The inverting input of the first op amp is connected to the voltage terminal of the voltage transformer output, the non-inverting input of the first op amp is connected to the VREF terminal of the voltage transformer, and the first resistor is connected between the inverting input of the first op amp and the non-inverting input of the first op amp. The output of the first op amp is connected to the filter circuit. There are six sets of op amp conditioning circuits, connected one-to-one with the six sets of voltage transformers. Accordingly, the six op amp conditioning circuits are connected one-to-one with the six filter circuits.

[0047] A switch state sampling circuit 2 is connected to the processor and collects, in real time, the voltage and phase values ​​on both sides of the low-voltage automatic switch, the current flowing through the switch, and the state of the switch. The switch state sampling circuit 2 includes a three-way low-voltage automatic switch connected to the processor. When powered on, the three-way low-voltage automatic switch passes 12 phase voltages and 6 phase currents. The processor samples the 12 phase voltages and 6 phase currents of the three-way low-voltage automatic switch at 32 points per cycle. The switch state sampling circuit 2 is equipped with an optocoupler isolation circuit. The optocoupler isolation circuit is connected to the switch state sampling circuit 2. The internal signal power is transmitted through the normally open passive contacts of the three low-voltage automatic switches, to the optocoupler for isolation, and then to the processor pins. The processor interrupts the sampling and, after debounce processing, transmits the open / close state of the low-voltage automatic switch.

[0048] Multiple groups of relay output signal circuits, any group of relay output signal circuits in the multiple groups of relay output signal circuits are controlled by a processor, and each relay automatically controls the opening and closing of multiple switches in steps by receiving the processor signal.

[0049] Logic Control: The processor monitors the voltage and phase on both sides of the switch, the current flowing through the switch, and the switch status in real time. When a one-touch switch linkage command is issued, it determines whether the switch is hot or cold, the transformer load, and other conditions, and automatically opens and closes multiple switches in a step-by-step manner.

[0050] Example 2:

[0051] like Figure 6 As shown, Figure 6 This is a schematic diagram of the system connecting three low-voltage automatic switches to the utility model. 1B is the 10kV / 400V transformer #1, 2B is the 10kV / 400V transformer #2, 1L is the incoming line automatic switch #1, 2L is the incoming line automatic switch #2, and ML is the busbar tie automatic switch. The three low-voltage automatic switches are connected to three controllers: the first controller 3, the second controller 4, and the third controller 5. Each controller has three lines.

[0052] Among them, two lines of the first controller 3 are connected to the closing auxiliary contacts of the 1L and 2L switches respectively, and the third line of the first controller 3 is connected in series to the closing circuit of the ML switch.

[0053] The two lines of the second controller 4 are connected to the closing auxiliary contacts of the 1L and ML switches respectively, and the third line of the second controller 4 is connected in series to the closing circuit of the 2L switch.

[0054] The two lines of the third controller 5 are connected to the closing auxiliary contacts of the 2L and ML switches respectively, and the third line of the third controller 5 is connected in series to the closing circuit of the 1L switch.

[0055] 1B is connected to 1L, 2B is connected to 2L, the input end of 1L and the output end of 2L are connected to the ML section I bus and ML section II bus respectively.

[0056] The three controllers are connected one-to-one and control the local low-voltage automatic switches. The closing status of the other two switches must be connected to the local controller (the controller that controls the local switches). In other words, when one of the controllers needs to control the corresponding low-voltage automatic switch, it needs to obtain the closing status of the other two low-voltage automatic switches as one of the conditions.

[0057] Specifically, a low-voltage automatic switch is arbitrarily selected as the local switch. The control loop formed by the local switch and its corresponding controller controls only the local low-voltage automatic switch. The controller corresponding to the local switch is connected to the other two low-voltage automatic switches to obtain the closed and open states of the two low-voltage automatic switches. The controller connected to the local switch forms a closed state acquisition loop with the other two low-voltage automatic switches. The controller connected to the local switch only obtains the closed state of the other two low-voltage automatic switches and does not control the opening and closing of the other two low-voltage automatic switches.

[0058] Figure 6 In the context of the breaker, the word "lock" means it can be locked or allowed, meaning that closing is permitted if the conditions are met. If the conditions are not met, closing is not permitted. In this state, the low-voltage recloser cannot be operated because the closing signal is blocked by the controller. The controller essentially inserts an electronic lock or watchdog into the closing circuit. If the conditions are met, the closing signal is allowed to pass; if the conditions are not met, the signal is blocked. The low-voltage recloser is electrically controlled, and the controller is connected in series to the closing circuit.

[0059] This function is designed to meet the safety requirements of low-voltage power regulation and low-voltage closing operations. It has two main functions: First, when new equipment is put into operation, the control device automatically detects whether the voltage phases on both sides of the switch are the same. If the phases are different, manual closing is blocked; if the phases are the same, manual closing is allowed. Second, when the low-voltage system requires closing operation, the controller will determine the closing conditions. If the closing conditions are met, manual closing is allowed; if not, manual closing is blocked.

[0060] In summary, the present invention's electronic three-lock, two-key anti-misoperation circuit for a low-voltage automatic switch allows only two of the three low-voltage automatic switches to be closed simultaneously, based on the voltage and phase values ​​on both sides of the low-voltage automatic switch and the switch status. The output relay contacts are fed into the switch closing circuit. If the relay contacts are closed, closing is enabled; otherwise, closing is prohibited.

[0061] Example 3:

[0062] The utility model provides a control device, comprising the low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit described in embodiment 1.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit, characterized in that: include: A processor with an ARM architecture, the processor being connected to three low-voltage automatic switches, and the processor being capable of controlling the synchronous closing of two of the three low-voltage automatic switches; Three sets of optocoupler circuits, the three sets of optocoupler circuits are connected one to one to three low-voltage automatic switches; A voltage sampling circuit (1) connected to the processor; A switch state sampling circuit (2) is connected to the processor, and the switch state sampling circuit (2) collects in real time the voltage value and phase on both sides of the low-voltage automatic switch, the current flowing through the low-voltage automatic switch, and the state of the low-voltage automatic switch; Multiple groups of relay output signal circuits, any group of relay output signal circuits in the multiple groups of relay output signal circuits are controlled by a processor, and each relay automatically controls the opening and closing of multiple switches in steps by receiving the processor signal.

2. A low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to claim 1, characterized in that: The processor is a single chip microcomputer, and its model is STM32F051.

3. A low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to claim 2, characterized in that: The three low-voltage automatic switches are set as local switch, auxiliary I switch and auxiliary II switch respectively; The local switch is connected to the first optocoupler circuit; The auxiliary I switch is connected to the second optocoupler circuit; The auxiliary II switch is connected to a third optocoupler circuit.

4. A low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to claim 3, characterized in that: The first optocoupler circuit includes a resistor R201 and an optocoupler U201; The first end of the resistor R201 is connected to the local switch output terminal YX0, the second end of the resistor R201 is connected to the positive electrode of the light-emitting end of the optical coupler U201, and the negative electrode of the light-emitting end of the optical coupler U201 is connected to the DIGND ground line; The collector of the light-receiving end of the optical coupler U201 is connected to the DIO pin of the processor, and the emitter of the light-receiving end is connected to the DGND ground line.

5. The low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to claim 3 is characterized in that: The second optocoupler circuit includes a resistor R202 and an optocoupler U202; The first end of the resistor R202 is connected to the auxiliary I switch output terminal YX1, the second end of the resistor R202 is connected to the positive electrode of the light-emitting end of the optical coupler U202, and the negative electrode of the light-emitting end of the optical coupler U202 is connected to the DIGND ground line; The light receiving end collector of the optical coupler U202 is connected to the DI1 pin of the processor, and the light receiving end emitter thereof is connected to the DGND ground line.

6. A low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to claim 3, characterized in that: The third optocoupler circuit includes a resistor R203 and an optocoupler U203; The first end of the resistor R203 is connected to the auxiliary II switch output terminal YX2, the second end of the resistor R203 is connected to the positive electrode of the light-emitting end of the optical coupler U203, and the negative electrode of the light-emitting end of the optical coupler U203 is connected to the DIGND ground line; The light receiving end collector of the optical coupler U203 is connected to the DI2 pin of the processor, and the light receiving end emitter thereof is connected to the DGND ground line.

7. A control device, characterized in that: The invention comprises the low-voltage automatic switch electronic three-lock two-key anti-misoperation circuit according to any one of claims 1 to 6.

Images