Circuit breaker position state acquisition circuit

Abstract

The utility model provides a circuit breaker position state acquisition circuit comprising three position contacts of a circuit breaker, a 220V DC power supply, a relay group, a NOT gate circuit and an AND gate circuit. A position contact of the circuit breaker is connected with the relay group in series and is connected with a 220V direct-current power supply; a connection position contact, a test position contact and an exit position contact are respectively connected with starting coils and reset coils of the first relay, the second relay and the third relay; a normally open contact of the first relay is connected with the input end of the NOT gate circuit, and the output end of the NOT gate circuit is connected with the first input end of the AND gate circuit; a normally closed contact of the second relay is connected with a second input end of the AND gate circuit; a normally closed contact of the third relay is connected with a third input end of the AND gate circuit; the output end of the AND gate circuit is connected with the acquisition port of the controller. According to the utility model, reliable acquisition of the connection position of the circuit breaker is realized, the state of the connection position is output through acquisition of different position states, and the requirements of locking and remote signaling are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement and control systems of automatic transfer switches, in particular to a circuit breaker position state acquisition circuit. Background Art

[0002] The closing circuit of two circuit breakers controlled by the low-voltage incoming line automatic transfer system is required to have an electrical interlocking (interlocking) function, that is, when one of the circuit breakers is in the closed state, the second circuit breaker cannot be electrically closed. When the circuit breaker is installed in a drawer type, the circuit breaker can be divided into three position states, namely, the connection position, the test position, and the withdrawal position. In actual application, the electrical interlocking function can be started when the two circuit breakers are in the connection position at the same time. If it is not met, the electrical interlocking stops, and the status indication signal needs to collect the position status of the circuit breaker.

[0003] Therefore, it is necessary to design a circuit for collecting the position status of a circuit breaker, and to realize reliable collection of the connection position status of the circuit breaker through electrical circuit and logic circuit design. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a circuit breaker position state acquisition circuit to realize reliable acquisition of the connection position state of the circuit breaker, specifically to select three state inputs of connection, test, and exit, and design one output as the connection position state.

[0005] In a first aspect, an embodiment of the utility model provides a circuit breaker position state acquisition circuit, based on the connection position contact, test position contact, and exit position contact of the circuit breaker, including a 220V DC power supply, a relay group, and a logic gate circuit, wherein the logic gate circuit includes a NOT gate circuit and an AND gate circuit;

[0006] The relay group includes a first relay, a second relay, and a third relay, and the first relay, the second relay, and the third relay respectively include a start coil, a reset coil, a normally open contact, and a normally closed contact;

[0007] The position contacts of the circuit breaker are connected in series with the relay group and connected to the 220V DC power supply, the connection position contacts are respectively connected to the start coil and the reset coil of the first relay, the test position contacts are respectively connected to the start coil and the reset coil of the second relay, and the exit position contacts are respectively connected to the start coil and the reset coil of the third relay;

[0008] The normally open contact of the first relay is connected to the input end of the NOT gate circuit, and the output end of the NOT gate circuit is connected to the first input end of the AND gate circuit;

[0009] The normally closed contact of the second relay is connected to the second input terminal of the AND gate circuit;

[0010] The normally closed contact of the third relay is connected to the third input terminal of the AND gate circuit;

[0011] The output end of the AND gate circuit is connected to the controller acquisition port.

[0012] Preferably, it also includes a locking node for outputting a passive, holding signal; one end of the locking node is connected to the normally closed contact of the first relay, and the other end is connected to the normally open contact of the third relay;

[0013] Among them, the normally closed contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay are connected in sequence.

[0014] Preferably, the relay group adopts an electromagnetic two-position relay. When the reset coil works, the normally open contact is disconnected and the normally closed contact is closed; when the start coil works, the normally open contact is closed and the normally closed contact is closed.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The utility model realizes reliable collection of the connection position of the circuit breaker, and through the collection of different position states, the state of the output connection position can meet the needs of locking and remote signaling, specifically, it realizes the node of output locking, completes electrical interlocking, and realizes the state collection of controller remote signaling.

[0017] Other features and advantages of the utility model will be described in the following description, and some features will become apparent from the description or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the connection between the circuit breaker and the main circuit provided in the embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the circuit connection of a circuit breaker position status node output circuit provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the connection between the circuit breaker position state node and the relay group provided in an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of a connection locking node provided for an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the connection of a first circuit breaker position status node acquisition circuit provided by an embodiment of the utility model;

[0024] Figure 6 A schematic diagram of the connection of a second circuit breaker position status node acquisition circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] To facilitate understanding of this embodiment, a circuit breaker position status acquisition circuit disclosed in an embodiment of the utility model is first introduced in detail. Based on the connection position contact CE, test position contact CT, and exit position contact CD of the circuit breaker, it includes a 220V DC power supply, a relay group, and a logic gate circuit, wherein the logic gate circuit includes a NOT gate circuit U1 and an AND gate circuit U2.

[0027] Among them, Figure 1-2 As shown, when the circuit breaker is in the connection position state, the circuit breaker is connected to the main circuit, at this time, the 311 end and the 312 end of the connection position contact CE1 are connected, and the 311 end and the 314 end are disconnected; when the circuit breaker is in the test position and the withdrawal position, the circuit breaker is disconnected from the main circuit, at this time, the 311 end and the 312 end of the connection position contact CE1 are disconnected, and the 311 end and the 314 end are connected.

[0028] In this embodiment, the relay group includes a first relay 1KM, a second relay 2KM, and a third relay 3KM, and the first relay 1KM, the second relay 2KM, and the third relay 3KM respectively include a start coil, a reset coil, a normally open contact NO, and a normally closed contact NC;

[0029] Wherein, the relay group adopts an electromagnetic two-position relay. When the reset coil works, the normally open contact NO is disconnected and the normally closed contact NC is closed; when the start coil works, the normally open contact NO is closed and the normally closed contact NC is closed.

[0030] The position contacts of the circuit breaker are connected in series with the relay group and connected to the 220V DC power supply, the connection position contacts CE are respectively connected to the start coil and the reset coil of the first relay 1KM, the test position contacts CT are respectively connected to the start coil and the reset coil of the second relay 2KM, and the exit position contacts CD are respectively connected to the start coil and the reset coil of the third relay 3KM;

[0031] Specifically, Figure 3 As shown, the terminal 311 of the connection position contact CE is connected to a 220V DC power supply, the terminal 314 is connected to the positive terminal A1 of the start coil of the first relay 1KM, the terminal 312 is connected to the positive terminal A4 of the reset coil of the first relay 1KM, and the negative terminal A2 of the start coil and the negative terminal A5 of the reset coil of the first relay 1KM are connected to the 220V DC power supply;

[0032] Terminal 911 of the test position contact CT is connected to a 220V DC power supply, terminal 914 is connected to the positive terminal A1 of the start coil of the second relay 2KM, terminal 912 is connected to the positive terminal A4 of the reset coil of the second relay 2KM, and the negative terminal A2 of the start coil and the negative terminal A5 of the reset coil of the second relay 2KM are connected to the 220V DC power supply;

[0033] Terminal 811 of the exit position contact CD is connected to a 220V DC power supply, terminal 814 is connected to the positive terminal A1 of the start coil of the third relay 3KM, terminal 812 is connected to the positive terminal A4 of the reset coil of the third relay 3KM, and the negative terminal A2 of the start coil and the negative terminal A5 of the reset coil of the third relay 3KM are connected to the 220V DC power supply;

[0034] In this embodiment, it also includes a locking node for outputting a passive, holding signal; one end of the locking node is connected to the normally closed contact NC of the first relay 1KM, and the other end is connected to the normally open contact NO of the third relay 3KM; the normally closed contact NC of the first relay 1KM, the normally open contact NO of the second relay 2KM, and the normally open contact NO of the third relay 3KM are connected in sequence.

[0035] Specifically, Figure 4 As shown, one end numbered 3 of the normally closed contact NC (connection signal 2) of the first relay 1KM is connected to one end of the locking node, and the other end numbered 4 is connected to one end numbered 5 of the normally open contact NO (test signal 1) of the second relay 2KM, the other end numbered 6 of the normally open contact NO (test signal 1) of the second relay 2KM is connected to one end numbered 9 of the normally open contact NO (exit signal 1) of the third relay 3KM, and the other end numbered 10 of the normally open contact NO (exit signal 1) of the third relay 3KM is connected to one end of the locking node.

[0036] In this embodiment, the normally open contact NO (connection signal 1) of the first relay 1KM is connected to the input terminal 1A of the NOT gate circuit U1, and the output terminal 1Y of the NOT gate circuit U1 is connected to the first input terminal A of the AND gate circuit U2; the normally closed contact NC (test signal 2) of the second relay 2KM is connected to the second input terminal B of the AND gate circuit U2; the normally closed contact NC (exit signal 2) of the third relay 3KM is connected to the third input terminal C of the AND gate circuit U2; the output terminal Y of the AND gate circuit U2 is connected to the controller acquisition port I, and the controller acquisition port I outputs a state of 0 or 1. When the state acquired by the controller acquisition port is 1, it is identified as a connection position.

[0037] Specifically: Figure 5 As shown, when the normally open contact NO (connection signal 1) of the first relay 1KM is disconnected and the input terminal 1A of the NOT gate circuit U1 is 0, the reverse output 1Y of the NOT gate circuit U1 is 1, and the first input terminal A of the AND gate circuit U2 is 1; when the normally closed contact NC (test signal 2) of the second relay 2KM is closed, the second input terminal B of the AND gate circuit U2 is 1, and when the normally closed contact NC (exit signal 2) of the third relay 3KM is closed, the third input terminal C of the AND gate circuit U2 is 1, and when the three input terminals A, B, and C of the AND gate circuit U2 are all 1, the output terminal Y of the AND gate circuit U2 is 1, otherwise the output is 0.

[0038] like Figure 6 As shown, the normally open contact NO (connection signal 1) of the first relay 1KM is disconnected, the normally closed contact NC (test signal 2) of the second relay 2KM is closed, and the normally closed contact NC (exit signal 2) of the third relay 3KM is closed. When all three states are met, the output terminal Y of the AND gate circuit U2 is 1, otherwise the output is 0.

[0039] In this embodiment, when the circuit breaker is in the connection position, it satisfies the non-test and non-exit positions at the same time. Through the linkage of the position contacts, the reset coil of the first relay 1KM works, the start coil of the second relay 2KM works, and the start coil of the third relay 3KM works, satisfying the following contents:

[0040] 1) The normally closed contact NC (connection signal 2) of the first relay 1KM is closed, the normally open contact NO (test signal 1) of the second relay 2KM is closed, the normally open contact NO (exit signal 1) of the third relay 3KM is closed, and the connection locking node is closed;

[0041] 2) The normally open contact NO (connection signal 1) of the first relay 1KM is disconnected, the normally closed contact NC (test signal 2) of the second relay 2KM is closed, and the normally closed contact NC (exit signal 2) of the third relay 3KM is closed, and the connection logic signal is 1.

[0042] In this embodiment, an electromagnetic dual-position relay line is used to expand the contact signal of the circuit breaker position state, and two sets of contact signals are used for locking and state acquisition. When the coil is powered off, the state position can be locked to complete the circuit breaker position contact linkage conversion;

[0043] Through the design of NOT gate and AND gate logic gate circuits, the three position states of the circuit breaker are judged, the collection of three position states and the output of one state are completed.

[0044] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit breaker position state acquisition circuit, based on the connection position contact, test position contact, and exit position contact of the circuit breaker, characterized in that: It includes a 220V DC power supply, a relay group, and a logic gate circuit, wherein the logic gate circuit includes a NOT gate circuit and an AND gate circuit; The relay group includes a first relay, a second relay, and a third relay, and the first relay, the second relay, and the third relay respectively include a start coil, a reset coil, a normally open contact, and a normally closed contact; The position contacts of the circuit breaker are connected in series with the relay group and connected to the 220V DC power supply, the connection position contacts are respectively connected to the start coil and the reset coil of the first relay, the test position contacts are respectively connected to the start coil and the reset coil of the second relay, and the exit position contacts are respectively connected to the start coil and the reset coil of the third relay; The normally open contact of the first relay is connected to the input end of the NOT gate circuit, and the output end of the NOT gate circuit is connected to the first input end of the AND gate circuit; The normally closed contact of the second relay is connected to the second input terminal of the AND gate circuit; The normally closed contact of the third relay is connected to the third input terminal of the AND gate circuit; The output end of the AND gate circuit is connected to the controller acquisition port.

2. The circuit breaker position state acquisition circuit according to claim 1, characterized in that: Also included is a latching node for outputting a passive, holding signal; One end of the locking node is connected to the normally closed contact of the first relay, and the other end is connected to the normally open contact of the third relay; Among them, the normally closed contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay are connected in sequence.

3. The circuit breaker position state acquisition circuit according to claim 1, characterized in that: The relay group adopts an electromagnetic double-position relay. When the reset coil works, the normally open contact is disconnected and the normally closed contact is closed; when the start coil works, the normally open contact is closed and the normally closed contact is closed.

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