Non-power-outage bus PT capacitance current test resonance eliminator short-circuit device

Abstract

The utility model relates to an uninterruptible bus PT capacitance current test resonance eliminator short-circuit device which comprises an embedded short-circuit module and a PT neutral point current monitoring protection module. The embedded short circuit module comprises a vacuum contactor and a control panel, the vacuum contactor is in short circuit with a resonance eliminator for PT capacitance current testing, and the control panel is used for controlling opening and closing of the vacuum contactor; opening and closing of the vacuum contactor are used for controlling switching of the resonance eliminator. And the PT neutral point current monitoring protection module is used for detecting the current of a PT neutral point, and sending a control signal to the vacuum contactor when detecting that the current is abnormal, so that the resonance eliminator is put into use.

Description

Technical Field

[0001] This utility model relates to a short-circuit device for a harmonic suppressor for testing the current of a power supply busbar PT capacitor, belonging to the field of power grid busbar testing technology. Background Technology

[0002] Most 6-66kV distribution networks operate with an ungrounded neutral point. This mode, allowing short-term operation with a fault during a single-phase ground fault, significantly improves the system's power supply reliability. However, with the expansion of urban and rural power grids and the increase in cable outgoing lines, the system's ground capacitance current has increased dramatically. After a single-phase ground fault, the current flowing through the fault point is large, making it difficult to extinguish the arc and prone to intermittent arcing ground fault overvoltage. Simultaneously, the saturation of the electromagnetic voltage transformer core can easily cause resonant overvoltage, leading to a significant increase in the tripping rate. Regular testing of the system's capacitance current is necessary. Traditional busbar PT capacitance current testing requires simultaneous collaboration between dispatching, operation and maintenance, and repair teams, involving repeated power outages and restorations of the busbar PT, which is time-consuming and labor-intensive. The development of an uninterrupted busbar PT capacitance current testing harmonic suppressor short-circuit device can improve the efficiency of busbar PT capacitance current testing, optimize the testing process, and provide an uninterrupted operation method for subsequent work.

[0003] The existing traditional testing technology workflow is as follows:

[0004] 1) PT power failure;

[0005] 2) Short-circuit the harmonic suppressor;

[0006] 3) PT is powered on;

[0007] 4) Capacitor current test;

[0008] 5) PT power failure;

[0009] 6) Remove the shorting wire from the harmonic suppressor;

[0010] 7) PT is powered on;

[0011] This traditional testing technology requires the simultaneous collaboration of scheduling, operation and maintenance, and repair parties, and involves repeated power outages and restorations of the bus PT, which is time-consuming and labor-intensive. Utility Model Content

[0012] In order to solve the problems existing in the prior art, this utility model proposes a short-circuit device for the harmonic suppressor of the PT capacitor current test on the uninterruptible bus.

[0013] The technical solution of this utility model is as follows:

[0014] A short-circuit device for testing the harmonic suppressor of a non-powered busbar PT capacitor current includes:

[0015] Embedded short-circuit module and PT neutral point current monitoring and protection module;

[0016] The embedded short-circuit module includes a vacuum contactor and a control panel. The vacuum contactor is short-circuited with the harmonic suppressor for PT capacitor current testing. The control panel is used to control the opening and closing of the vacuum contactor. The opening and closing of the vacuum contactor is used to control the switching on and off of the harmonic suppressor.

[0017] The PT neutral point current monitoring and protection module is used to detect the current at the PT neutral point. When an abnormal current is detected, it sends a control signal to the vacuum contactor to activate the harmonic suppressor.

[0018] In a preferred embodiment, the control panel is mounted on the switch cabinet panel.

[0019] In a preferred embodiment, the control panel is provided with multiple indicator lights, including a closing indicator light, a opening indicator light, and a protection action indicator light.

[0020] In a preferred embodiment, the control panel is provided with a button, which is connected to the vacuum contactor and used to control the opening and closing of the vacuum contactor.

[0021] In a preferred embodiment, the PT neutral point current monitoring and protection module includes a current transformer and a protection unit. The current transformer is used to detect the current, and the protection unit sends a control signal to the vacuum contactor.

[0022] Additional aspects and advantages of this invention will be set forth in the following description, and some of them will be obvious from the description, or may be learned by practice of the invention. Furthermore, various aspects and advantages of this invention may be realized and obtained by means of method steps and combinations particularly pointed out in the appended claims. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the device modules in an embodiment of the present utility model;

[0024] Figure 2 This is a partial circuit wiring diagram in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the control panel in an embodiment of the present utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0028] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0030] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0031] See Figure 1 This embodiment provides a short-circuit device for testing the harmonic suppressor of a non-power-off bus PT capacitor current, comprising:

[0032] Embedded short-circuit module and PT neutral point current monitoring and protection module;

[0033] The embedded short-circuit module includes a vacuum contactor and a control panel. The vacuum contactor is short-circuited with the harmonic suppressor for PT capacitor current testing. The control panel is used to control the opening and closing of the vacuum contactor. The opening and closing of the vacuum contactor is used to control the switching of the harmonic suppressor. The opening time of the vacuum contactor is ≤20ms and the closing time is ≤30ms, thereby controlling the switching of the harmonic suppressor.

[0034] The PT neutral point current monitoring and protection module is used to detect the current at the PT neutral point. When an abnormal current is detected, it sends a control signal to the vacuum contactor to activate the harmonic suppressor.

[0035] In a preferred embodiment of this invention, the control panel is disposed on the switch cabinet panel.

[0036] See Figure 3In a preferred embodiment of this invention, the control panel is equipped with multiple indicator lights, including a closing indicator light, a opening indicator light, and a protection action indicator light. These indicator lights allow the control panel to display the actual opening and closing status of the short-circuit module.

[0037] In a preferred embodiment of this invention, the control panel is provided with a button, which is connected to the vacuum contactor and is used to control the opening and closing of the vacuum contactor.

[0038] In a preferred embodiment of this invention, the PT neutral point current monitoring and protection module includes a current transformer and a protection unit. The current transformer detects the current, and the protection unit sends a control signal to the vacuum contactor. The current transformer has an input current range of 1-100A and an output signal of 0-100mA, enabling it to monitor the neutral point current. When an increasing resonance trend is detected, the protection module activates within 20ms, and the vacuum contactor controls the restoration of the harmonic suppressor to prevent temporary resonance.

[0039] For details on the main circuit wiring, please refer to [link / reference]. Figure 2 , Figure 2 In this context, PT stands for bus voltage transformer, KM stands for vacuum contactor, and CT stands for current transformer (including protection unit).

[0040] Based on this embodiment, the resonator can be switched on and off without power interruption, which can improve the efficiency of bus PT capacitor current testing, optimize the testing process, and provide a power-on operation method for subsequent work.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A short-circuit device for testing the harmonic suppressor of a non-power-off busbar PT capacitor current, characterized in that, include: Embedded short-circuit module and PT neutral point current monitoring and protection module; The embedded short-circuit module includes a vacuum contactor and a control panel. The vacuum contactor is short-circuited with the harmonic suppressor for PT capacitor current testing. The control panel is used to control the opening and closing of the vacuum contactor. The opening and closing of the vacuum contactor is used to control the switching on and off of the harmonic suppressor. The PT neutral point current monitoring and protection module is used to detect the current at the PT neutral point. When an abnormal current is detected, it sends a control signal to the vacuum contactor to activate the harmonic suppressor.

2. The short-circuit device for testing the harmonic suppressor of a non-power-off bus PT capacitor current as described in claim 1, characterized in that: The control panel is located on the switch cabinet panel.

3. The short-circuit device for testing the harmonic suppressor of a non-power-off bus PT capacitor current as described in claim 1, characterized in that: The control panel is equipped with multiple indicator lights, including a closing indicator light, a tripping indicator light, and a protection action indicator light.

4. The short-circuit device for testing the harmonic suppressor of a non-power-off bus PT capacitor current as described in claim 1, characterized in that: The control panel is equipped with buttons that are connected to the vacuum contactor and are used to control the opening and closing of the vacuum contactor.

5. The short-circuit device for testing the harmonic suppressor of a non-power-off bus PT capacitor current as described in claim 1, characterized in that: The PT neutral point current monitoring and protection module includes a current transformer and a protection unit. The current transformer is used to detect the current, and the protection unit sends a control signal to the vacuum contactor.

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