Power supply loop of transformer substation circuit breaker and control cubicle

Abstract

The utility model discloses a power supply loop of a transformer station breaker and a control cubicle, belonging to the one-key sequential control field, the power supply loop of the transformer station breaker comprises a power supply branch used for power supply connection with the breaker, and the power supply branch is provided with a bistable relay contact in series. And the bistable relay coil is controlled according to a circuit breaker power supply loop switching-on and switching-off command. When a power supply loop of an old circuit breaker is improved by utilizing the scheme, the on-off of the power supply loop of the circuit breaker can be remotely controlled only by adding a bistable relay on the power supply loop of the old circuit breaker. The closing of the original air switch on the power supply loop is equivalent to a section of line and does not need to be dismantled; the bistable relay is placed inside the control cubicle, and compared with the prior art, a hole does not need to be formed in a panel of the control cubicle, so that original equipment is hardly damaged during transformation. The problem that part of air switches are not provided with corresponding remote control operation modules when a power supply loop of an old circuit breaker is improved is solved.

Description

Technical Field

[0001] The utility model belongs to the field of one-button sequential control, in particular to a power supply circuit and a control cabinet of a transformer substation circuit breaker. Background Art

[0002] The existing substation power supply circuit is equipped with an air switch in series to control the opening and closing of the circuit breaker power supply circuit. According to the requirements of one-button sequential control, the power supply circuit can be remotely controlled, such as Figure 1 As shown, the existing air switch is generally equipped with a corresponding remote control operation module. The remote control operation module is installed on the side of the air switch and is mechanically connected to the air switch operating handle. The motor in the remote control operation module drives the air switch operating handle to achieve the purpose of controlling the opening and closing of the air switch. The remote control operation module is not a universal module. It needs to be matched with the air switch to control the air switch. The air switch is set on the control cabinet panel. Therefore, when adding the remote control operation module, it is necessary to open a hole next to the air switch on the control cabinet panel that is already in operation to facilitate the installation of the remote control operation module. Since some air switches do not have corresponding remote control operation modules, it is difficult for some circuit breaker power supply circuits to meet the requirements of one-button remote control.

[0003] In summary, when improving the power supply circuit of the old circuit breaker, there is a problem that some air switches do not have corresponding remote control operation modules, which makes it difficult to modify the power supply circuit of the circuit breaker. Utility Model Content

[0004] The purpose of the utility model is to provide a power supply circuit and a control cabinet for a substation circuit breaker, so as to solve the technical problem that when improving the power supply circuit of an old circuit breaker in the prior art, some air switches have no corresponding remote control operation modules, which makes it difficult to modify the power supply circuit of the circuit breaker.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a technical solution of a power supply circuit and a control cabinet of a substation circuit breaker:

[0006] A power supply circuit of a transformer substation circuit breaker includes a power supply branch for supplying power to the circuit breaker, an air switch is arranged on the power supply branch, and contacts of a bistable relay are also arranged in series on the power supply branch. The coil of the bistable relay is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the air switch is in a closed state.

[0007] As a further improvement, the contacts of the bistable relay are normally open contacts.

[0008] As a further improvement, the coil of the bistable relay includes 1 coil output terminal and 2 coil input terminals, the power supply, the coil output terminal and one coil input terminal constitute an input circuit, the power supply, the coil output terminal and the other coil input terminal constitute another input circuit, one input circuit is electrically conductive according to the closing command of the circuit breaker power supply circuit so that the normally open contact is closed, and the other input circuit is electrically conductive according to the opening command of the circuit breaker power supply circuit so that the normally open contact is opened.

[0009] As a further improvement, the coil of the bistable relay and the power supply branch of the circuit breaker share a common power supply.

[0010] The utility model also discloses a control cabinet, including a first power supply and a circuit breaker, and also includes a power supply circuit of the transformer substation circuit breaker, the power supply circuit of the transformer substation circuit breaker includes a power supply branch connected to the circuit breaker, the first power supply is arranged on the power supply branch of the circuit breaker, an air switch is arranged on the power supply branch, and contacts of a bistable relay are also arranged in series on the power supply branch, the coil of the bistable relay is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the air switch is in a closed state.

[0011] As a further improvement, the contacts of the bistable relay are normally open contacts.

[0012] As a further improvement, the coil of the bistable relay includes 1 coil output terminal and 2 coil input terminals, the second power supply, the coil output terminal and one coil input terminal constitute an input circuit, the second power supply, the coil output terminal and another coil input terminal constitute another input circuit, one input circuit is electrically conductive according to the closing command of the circuit breaker power supply circuit so that the normally open contact is closed, and the other input circuit is electrically conductive according to the opening command of the circuit breaker power supply circuit so that the normally open contact is opened.

[0013] As a further improvement, the first power supply and the second power supply are the same power supply.

[0014] The beneficial effect of the power supply circuit of the substation circuit breaker of the utility model is that when the power supply circuit of the old circuit breaker is improved by using the scheme, it is only necessary to add a bistable relay to the old circuit breaker power supply circuit, so that the on and off of the circuit breaker power supply circuit can be remotely controlled. The closing of the original air switch on the power supply circuit is equivalent to a section of line, which does not need to be removed; the bistable relay is placed inside the control cabinet, and compared with the existing technology, it is not necessary to open a hole on the control cabinet panel, so that the modification does not almost destroy the original equipment. It solves the problem that when the power supply circuit of the old circuit breaker is improved, some air switches do not have corresponding remote control operation modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a power supply circuit of the prior art;

[0016] Figure 2 It is a circuit diagram of the power supply circuit of the substation circuit breaker of the utility model;

[0017] Figure 3 The utility model is a schematic diagram of the structure of a bistable relay of a power supply circuit of a transformer substation circuit breaker. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Example of control cabinet:

[0020] The existing control cabinet includes a power supply circuit for the transformer circuit breaker, which includes a power supply and an air switch, and the on and off of the circuit breaker power supply circuit is controlled by the air switch. In order to meet the requirement of remote control of the one-button sequential control, a remote control module of a corresponding model is configured on the air switch to meet the requirement of remote control of the one-button sequential control. When using this existing solution for transformation, firstly, it is necessary to find a remote control module of the corresponding type, but some old air switches do not have a corresponding remote control module; secondly, since the remote control module and the air switch are connected through a physical line, it is necessary to open a window on the panel of the control cabinet to ensure that the remote control module can be assembled with the air switch.

[0021] In order to solve the above problems, Figure 2 , Figure 3 As shown, the control cabinet includes a first power supply, a second power supply, a circuit breaker and a power supply circuit of a transformer substation circuit breaker. The first power supply is arranged in series in the power supply circuit of the transformer substation circuit breaker. The power supply circuit of the transformer substation circuit breaker includes a power supply branch for supplying power to the circuit breaker, and an air switch is arranged on the power supply branch. Among them, a bistable relay contact is arranged in series in the power supply circuit of the transformer substation circuit breaker. The bistable relay coil is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the above-mentioned air switch is in a closed state. That is, the remote control requirement of one-button sequential control is met by adding a bistable relay to the power supply branch of the transformer circuit breaker. Preferably, the bistable relay contact is a normally open contact.

[0022] Specifically, the bistable relay coil includes 1 coil output end and 2 coil input ends, the second power supply, the coil output end and one coil input end constitute an input circuit, the second power supply, the coil output end and another coil input end constitute another input circuit, one input circuit is electrically conductive according to the closing command of the circuit breaker power supply circuit so that the normally open contact is closed, and the other input circuit is electrically conductive according to the opening command of the circuit breaker power supply circuit so that the normally open contact is opened.

[0023] like Figure 2 As shown, in this embodiment, A1 and A2 are coil input terminals, and A3 is coil output terminal. When the circuit receives the circuit breaker operation first power supply closing command, the input circuit where A1 and A3 of the bistable relay KC are located is energized and turned on, the KC bistable relay normally open contacts (13, 14) are energized, the circuit breaker power supply circuit is turned on, and the circuit breaker is energized; when the circuit receives the circuit breaker operation first power supply remote control sub-command, the input circuit where A2 and A3 of the bistable relay KC are located is energized and turned on, the KC relay normally open contacts (13, 14) are reset, the circuit breaker power supply circuit is disconnected, and the circuit breaker loses power.

[0024] In order to improve the space utilization efficiency and power utilization rate of the control cabinet, the bistable relay coil and the power supply branch of the circuit breaker share a power supply, that is, the first power supply and the second power supply are the same power supply; there is no need to add an additional power supply for the bistable relay.

[0025] When using this solution for transformation, firstly, since the bistable relay only needs to be placed inside the control cabinet, there is no need to open a window on the control cabinet panel; secondly, the original air switch does not need to be removed, and the air switch can be directly closed and used as a conducting circuit. Compared with the existing transformation scheme, the scheme of this application hardly needs to destroy the original circuit and equipment, and the transformation using the scheme of this application is more convenient and faster.

[0026] Example of power supply circuit of substation circuit breaker:

[0027] The power supply circuit of the substation circuit breaker includes a power supply branch for supplying power to the circuit breaker, an air switch is arranged on the power supply branch, and a bistable relay contact is arranged in series on the power supply branch. The bistable relay coil is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the air switch is in a closed state. This embodiment is implemented with reference to the power supply circuit embodiment of the substation circuit breaker, and will not be described in detail here.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A power supply circuit of a substation circuit breaker, comprising a power supply branch for supplying power to the circuit breaker, wherein an air switch is arranged on the power supply branch, characterized in that: The power supply branch is also provided with contacts of a bistable relay in series, the coil of the bistable relay is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the air switch is in a closed state.

2. The power supply circuit of the substation circuit breaker according to claim 1, characterized in that: The contacts of the bistable relay are normally open contacts.

3. The power supply circuit of the substation circuit breaker according to claim 2, characterized in that: The coil of the bistable relay includes one coil output end and two coil input ends, the power supply, the coil output end and one coil input end constitute an input circuit, the power supply, the coil output end and the other coil input end constitute another input circuit, one input circuit is electrically conductive according to the closing command of the circuit breaker power supply circuit so that the normally open contact is closed, and the other input circuit is electrically conductive according to the opening command of the circuit breaker power supply circuit so that the normally open contact is opened.

4. The power supply circuit of the substation circuit breaker according to claim 2, characterized in that: The coil of the bistable relay and the power supply branch of the circuit breaker share a power supply.

5. A control cabinet, comprising a first power supply and a circuit breaker, characterized in that: It also includes a power supply circuit of a substation circuit breaker, which includes a power supply branch connected to the circuit breaker. A first power source is arranged on the power supply branch of the circuit breaker, an air switch is arranged on the power supply branch, and contacts of a bistable relay are also arranged in series on the power supply branch. The coil of the bistable relay is controlled according to the opening and closing command of the circuit breaker power supply circuit, and the air switch is in a closed state.

6. The control cabinet according to claim 5, characterized in that: The contacts of the bistable relay are normally open contacts.

7. The control cabinet according to claim 6, characterized in that: The coil of the bistable relay includes 1 coil output end and 2 coil input ends, the second power supply, the coil output end and the one coil input end constitute an input circuit, the second power supply, the coil output end and the other coil input end constitute another input circuit, one input circuit is electrically conductive according to the closing command of the circuit breaker power supply circuit so that the normally open contact is closed, and the other input circuit is electrically conductive according to the opening command of the circuit breaker power supply circuit so that the normally open contact is opened.

8. The control cabinet according to claim 6, characterized in that: The first power source and the second power source are the same power source.

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