Overload tripping circuit breaker feeder loop control circuit

Abstract

The utility model relates to a feeder loop control circuit of an overload tripping circuit breaker. A circuit breaker is arranged on a main circuit; a current transformer is arranged on the main circuit; under the induction of the current transformer, when the current of the feeder loop is overloaded, the circuit breaker trips; according to the feeder loop control circuit for the overload tripping circuit breaker, the control circuit controls the overload tripping circuit breaker, and the problems that in an existing feeder loop, under the overload condition, after the circuit breaker is heated, tripping is conducted through deformation of a main contact, overload tripping is achieved, however, when the condition happens, the circuit breaker is not prone to falling off, and the overload tripping is achieved are solved. And the circuit breaker is damaged.

Description

Technical Field

[0001] The embodiment of the utility model relates to a feeder loop control circuit, and in particular to an overload tripping circuit breaker feeder loop control circuit. Background Art

[0002] In the existing feeder circuit, in the event of an overload, the circuit breaker trips due to the deformation of the main contacts after heating up, achieving an overload trip. However, when this happens, the circuit breaker has already been damaged. Is it possible to implement a control circuit to control the overload tripping of the circuit breaker? Utility Model Content

[0003] The embodiment of the present utility model aims to provide an overload tripping circuit breaker feeder loop control circuit capable of realizing control of the overload tripping circuit breaker by the control circuit.

[0004] In order to achieve the above objectives, the embodiment of the present invention designs an overload tripping circuit breaker feeder loop control circuit, comprising:

[0005] Main circuit;

[0006] a circuit breaker, the circuit breaker being arranged on the main circuit;

[0007] A current transformer is provided on the main circuit; when the feeder loop current is overloaded under the induction of the current transformer, the circuit breaker trips.

[0008] Furthermore, in the overload circuit breaker feeder loop control circuit described in the present invention, the main circuit is a three-phase five-wire system.

[0009] Furthermore, in the overload tripping circuit breaker feeder loop control circuit described in the present invention, a control circuit is connected to the circuit breaker outlet terminal.

[0010] Furthermore, in the overload tripping circuit breaker feeder loop control circuit described in the present invention, the main circuit is connected to the incoming line terminal of the circuit breaker; and the current transformer is inserted into the outgoing line terminal of the circuit breaker.

[0011] Furthermore, in the overload tripping circuit breaker feeder circuit control circuit of the present invention, the control circuit further includes:

[0012] Control power supply;

[0013] A fuse is connected to the control power supply to the inlet terminal of the fuse; the outlet terminal of the fuse is respectively connected to the inlet terminal of the first normally open contact of the circuit breaker and the inlet terminal of the first normally closed contact of the circuit breaker, the inlet terminal of the first normally open contact of the second intermediate relay, and the inlet terminal of the multi-function meter;

[0014] The outgoing line terminal of the first normally open contact of the circuit breaker is connected to the incoming line terminal of the first intermediate relay coil and the incoming line terminal of the red indicator light; the outgoing line terminal of the first intermediate relay coil and the outgoing line terminal of the red indicator light are connected to the neutral line;

[0015] The outgoing terminal of the first normally closed contact of the circuit breaker is connected to the incoming terminal of the green indicator light; the outgoing terminal of the green indicator light is connected to the neutral line;

[0016] The outgoing terminal of the first normally open contact of the second intermediate relay is connected to the incoming terminal of the coil of the circuit breaker; the outgoing terminal of the coil of the circuit breaker is connected to the neutral line;

[0017] The output terminal of the multi-function meter is connected to the neutral line.

[0018] Furthermore, in the overload circuit breaker feeder loop control circuit described in the present invention, both ends of the coil of the second intermediate relay are connected to the output contacts of the fire-fighting equipment.

[0019] Furthermore, in the overload circuit breaker feeder loop control circuit described in the utility model, the S1 end of the current transformer is connected to the fourth, sixth and eighth terminals of the multi-function meter; the fifth, seventh and ninth terminals of the multi-function meter and the S2 end of the current transformer are short-circuited and grounded.

[0020] Furthermore, in the overload circuit breaker feeder loop control circuit described in the utility model, the eleventh, twelfth, thirteenth and fourteenth terminals of the multi-function meter are respectively connected to the main circuit, and three-phase fuses are connected to the eleventh, twelfth, thirteenth and fourteenth terminals of the multi-function meter.

[0021] Compared with the prior art, the implementation method of the present invention adopts a method of arranging a circuit breaker on the main circuit; arranging a current transformer on the main circuit; under the induction of the current transformer, when the current of the feeder circuit is overloaded, the circuit breaker trips; and realizing an overload tripping circuit breaker feeder circuit control circuit that realizes the control circuit to control the overload tripping circuit breaker, thereby solving the technical problem that in the existing feeder circuit, in the case of overload, the circuit breaker trips by deforming the main contacts after heating up, thereby realizing overload tripping, but when this happens, the circuit breaker has already been damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the main circuit of the utility model;

[0023] Figure 2 It is a structural diagram of the control circuit of the utility model;

[0024] Figure 3 This is a schematic diagram of the external fire signal of the control circuit of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the current detection of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of voltage detection of the utility model. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be achieved.

[0028] The embodiment of the present utility model relates to an overload tripping circuit breaker feeder circuit control circuit, such as Figures 1 to 2 As shown, including:

[0029] The main circuits L1, L2, L3, and N serve as the main circuits of the feeder loop control circuit of the overload tripping circuit breaker in this embodiment;

[0030] A circuit breaker QF is provided on the main circuits L1, L2, L3, and N. The circuit breaker QF is used to control the on / off of the feeder circuit of the overload trip circuit breaker in this embodiment.

[0031] Current transformers TA1-TA3 are installed on the main circuits L1, L2, L3, and N. When the feeder circuit current is overloaded, the circuit breaker QF trips under the induction of the current transformers TA1-TA3. The current transformers TA1-TA3 are used to sense the currents in the main circuits L1, L2, L3, and N. When the feeder circuit current is overloaded, the circuit breaker QF trips. This implements an overload tripping circuit breaker feeder circuit control circuit that controls the overload tripping circuit breaker. This solves the technical problem in existing feeder circuits where, in an overload situation, the circuit breaker trips due to heating and deformation of the main contacts, achieving overload tripping. However, by the time this occurs, the circuit breaker has already been damaged.

[0032] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the main circuit L1, L2, L3, and N are three-phase five-wire systems.

[0033] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the control circuit is connected to the QF output terminal of the circuit breaker.

[0034] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the main circuits L1, L2, L3, and N are connected to the incoming terminals of the circuit breaker QF. Current transformers TA1 to TA3 are inserted into the outgoing terminals of the circuit breaker QF. The current transformers TA1 to TA3 are used to sense the current in the feeder loop control circuit of the overload tripping circuit breaker in this embodiment.

[0035] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the control circuit further includes:

[0036] The control power supply L1 serves as the control power supply for the feeder loop control circuit of the overload trip circuit breaker in this embodiment;

[0037] Connect the control power supply L1 to the incoming terminal of the fuse FU1; the outgoing terminal of the fuse FU1 is respectively connected to the incoming terminal of the first normally open contact QF-1 of the circuit breaker, the incoming terminal of the first normally closed contact QF-2 of the circuit breaker, the incoming terminal of the first normally open contact KA2-1 of the second intermediate relay, and the incoming terminal of the multi-function meter PJ; the fuse FU1 is used for short-circuit protection.

[0038] The outgoing line of the first normally open contact QF-1 of the circuit breaker is connected to the incoming line of the first intermediate relay coil KA1 and the incoming line of the red indicator light HR; the outgoing line of the first intermediate relay coil KA1 and the outgoing line of the red indicator light HR are connected to the neutral line N; the first normally open contact QF-1 of the circuit breaker is used for closing indication.

[0039] The outgoing line of the first normally closed contact QF-2 of the circuit breaker is connected to the incoming line of the green indicator light HG; the outgoing line of the green indicator light HG is connected to the neutral line N; the first normally closed contact QF-2 of the circuit breaker is used for opening indication.

[0040] The output terminal of the first normally open contact KA2-1 of the second intermediate relay is connected to the coil input terminal of the circuit breaker QF; the coil output terminal of the circuit breaker QF is connected to the neutral line N; the first normally open contact KA2-1 of the second intermediate relay is used for fire protection tripping.

[0041] The output terminal of the multi-function meter PJ is connected to the neutral line N. Power is provided to the multi-function meter PJ.

[0042] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, both ends of the coil of the second intermediate relay KA2 are connected to the fire equipment output contacts FK.

[0043] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the fourth, sixth, and eighth terminals of the multi-function meter PJ are connected to the S1 terminals of the current transformers TA1-TA3. The fifth, seventh, and ninth terminals of the multi-function meter PJ and the S2 terminals of the current transformers TA1-TA3 are short-circuited and then grounded. This circuit implements the current measurement circuit of the multi-function meter PJ in the feeder circuit control circuit of the overload tripping circuit breaker in this embodiment, and is used for circuit testing of the multi-function meter PJ.

[0044] In order to achieve the above technical effects, the overload tripping circuit breaker feeder circuit control circuit in this embodiment is as follows: Figures 1 to 2 As shown, the eleventh, twelfth, thirteenth, and fourteenth terminals of the multi-function meter PJ are connected to the main circuits L1, L2, L3, and N, respectively. Three-phase fuses FU2, FU3, and FU4 are also connected to the eleventh, twelfth, thirteenth, and fourteenth terminals of the multi-function meter PJ. The voltage measurement circuit of the multi-function meter PJ in the overload tripping feeder circuit control circuit of this embodiment is used to detect the voltage of the multi-function meter PJ.

[0045] In this embodiment, the overload tripping circuit breaker feeder circuit control circuit trips the circuit breaker via the first normally closed contact QF-2 when the current increases. This first normally closed contact QF-2 is connected in series with the control circuit to control the overload tripping circuit breaker. This changes the existing technology, which uses deformation of the main contacts to trip the circuit breaker to achieve overload tripping. However, by the time this occurs, the circuit breaker has already been damaged. Simultaneously, current changes can be monitored using a multi-function meter PJ.

[0046] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An overload trip circuit breaker feeder circuit control circuit, characterized in that: include: Main circuit (L1, L2, L3, N); a circuit breaker (QF), the circuit breaker (QF) being provided on the main circuit (L1, L2, L3, N); Current transformers (TA1-TA3) are provided on the main circuits (L1, L2, L3, N); when the feeder loop current is overloaded under the induction of the current transformers (TA1-TA3), the circuit breaker (QF) trips.

2. The overload tripping circuit breaker feeder circuit control circuit according to claim 1, characterized in that: The main circuit (L1, L2, L3, N) is a three-phase five-wire system.

3. The overload tripping circuit breaker feeder circuit control circuit according to claim 1, characterized in that: A control circuit is connected to the outgoing terminal of the circuit breaker (QF).

4. The overload tripping circuit breaker feeder circuit control circuit according to claim 1, characterized in that: The main circuit (L1, L2, L3, N) is connected to the incoming line terminal of the circuit breaker (QF); the outgoing line terminal of the circuit breaker (QF) is penetrated by the current transformer (TA1-TA3).

5. The overload tripping circuit breaker feeder circuit control circuit according to claim 3, characterized in that: The control circuit further includes: Control power supply (L1); A fuse (FU1) is connected to the control power supply (L1) at the incoming line terminal of the fuse (FU1); the outgoing line terminal of the fuse (FU1) is respectively connected to the incoming line terminal of the first normally open contact (QF-1) of the circuit breaker, the incoming line terminal of the first normally closed contact (QF-2) of the circuit breaker, the incoming line terminal of the first normally open contact (KA2-1) of the second intermediate relay, and the incoming line terminal of the multi-function meter (PJ); The outgoing line end of the first normally open contact (QF-1) of the circuit breaker is connected to the incoming line end of the first intermediate relay coil (KA1) and the incoming line end of the red indicator light (HR); the outgoing line end of the first intermediate relay coil (KA1) and the outgoing line end of the red indicator light (HR) are connected to the neutral line (N); The outgoing terminal of the first normally closed contact (QF-2) of the circuit breaker is connected to the incoming terminal of the green indicator light (HG); the outgoing terminal of the green indicator light (HG) is connected to the neutral line (N); The outgoing terminal of the first normally open contact (KA2-1) of the second intermediate relay is connected to the incoming terminal of the coil of the circuit breaker (QF); the outgoing terminal of the coil of the circuit breaker (QF) is connected to the neutral line (N); The output terminal of the multi-function meter (PJ) is connected to the neutral line (N).

6. The overload tripping circuit breaker feeder circuit control circuit according to claim 5, characterized in that: Both ends of the coil of the second intermediate relay (KA2) are connected to the fire-fighting equipment output contacts (FK).

7. The overload tripping circuit breaker feeder circuit control circuit according to claim 1, characterized in that: The S1 terminal of the current transformer (TA1-TA3) is connected to the fourth terminal, the sixth terminal, and the eighth terminal of the multi-function meter (PJ); the fifth terminal, the seventh terminal, the ninth terminal of the multi-function meter (PJ) and the S2 terminal of the current transformer (TA1-TA3) are short-circuited and then grounded.

8. The overload tripping circuit breaker feeder circuit control circuit according to claim 7, characterized in that: The main circuit (L1, L2, L3, N) is connected to the eleventh, twelfth, thirteenth and fourteenth terminals of the multifunction meter (PJ), respectively, and three-phase fuses (FU2, FU3, FU4) are connected to the eleventh, twelfth, thirteenth and fourteenth terminals of the multifunction meter (PJ).

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