CN209948519U - Ring main unit prevents taking earthing combined floodgate protection device - Google Patents

Abstract

The utility model provides a protection device for preventing grounded closing of a ring main unit, which comprises a first PT transformer arranged at the incoming line end of the ring main unit, a second PT transformer arranged at the outgoing end, a controller and an electric lock tongue; the controller comprises: voltage sampling module, wireless communication module, MCU module, relay and power supply module; the input end of the voltage sampling module is electrically connected with the first PT transformer and the second PT transformer; the output end of the voltage sampling module is electrically connected with the MCU module; wireless The communication module is electrically connected with the MCU module; the relay is electrically connected with the MCU module; the electric lock tongue is electrically connected with the relay; the power supply module is used for providing working power. When the utility model is in use, it can automatically judge whether the ring main unit of this level is live and correspondingly lock or open the operation hole of the grounding switch, so that the maintenance personnel cannot operate the grounding switch of the ring main unit of the same level when the power is on, thereby effectively preventing the maintenance personnel from being electrified. The misoperation of closing the grounding switch ensures the safety of personnel and equipment.

Description

A kind of ring network cabinet to prevent with grounding closing protection device

technical field

The utility model relates to a protection facility for a ring network cabinet of a power supply line, in particular to a protection device for a ring network cabinet to prevent grounding and closing.

Background technique

In order to improve the reliability of power supply, the power supply network is usually connected in a ring shape, which is referred to as ring network power supply for short. The so-called ring network cabinet means that each distribution branch is equipped with a switch cabinet, and the busbar of this switch cabinet is also a part of the ring trunk. As a kind of electrical equipment, ring main unit plays the role of load switch and fuse. In the power system, the 10kV ring main unit is responsible for the important function of power transmission. In order to ensure the normal operation of the ring network cabinet, the maintenance of the ring network cabinet during the commissioning process is essential. During the maintenance, the grounding switch of the ring network cabinet plays a major role in ensuring the personal safety of the equipment maintenance personnel. If the grounding switch is closed with electricity, it will seriously threaten the personal safety and electricity safety of the maintenance personnel, resulting in a vicious liability accident. During the maintenance of the ring network cabinet, if the coordination between the ring network cabinet located at the front end of the distribution line and the ring network cabinet located at the rear end to be repaired is not good, the above-mentioned safety accidents are prone to occur. At present, the method of preventing the grounding switch from being closed when the ring main unit is overhauled mainly relies on manual operation ticket notification, on-site walkie-talkie communication coordination, etc., but the two ring network cabinets at the front and rear are often far apart, and the manual operation ticket and walkie-talkie communication It is often inconvenient to cooperate, and manual cooperation is prone to errors, and there are potential safety hazards.

Utility model content

The purpose of the utility model is: to solve the technical problem mentioned in the background art, to provide a protection device for the ring main unit to prevent the closing with grounding.

The technical scheme of the present utility model is: the ring network cabinet of the present utility model is prevented from being grounded and closed, and its structural characteristics are: including a first PT transformer, a second PT transformer, a controller and an electric lock tongue;

The above-mentioned first PT transformer is set at the incoming end of the ring main unit when in use, and is used to collect the voltage signal at the incoming end of the ring main unit; the second PT transformer is placed at the outgoing end of the ring main unit when in use, and is used to collect the voltage signal of the incoming end of the ring main unit. the voltage signal at the outlet end of the network cabinet; the above-mentioned controller includes a voltage sampling module, a wireless communication module, an MCU module, a relay and a power supply module; the input end of the above-mentioned voltage sampling module is electrically connected with the first PT transformer and the second PT transformer; the voltage The output end of the sampling module is electrically connected with the MCU module; the wireless communication module is electrically connected with the MCU module, and the wireless communication module is used for communication between two adjacent ring main units; the relay is electrically connected with the MCU module; the electric lock tongue is connected with the relay Electrical connection, the power-on and power-off of the electric lock tongue is controlled by the relay; the power module is used to provide working power.

The utility model has positive effects: (1) The ring main unit of the present utility model prevents the grounding and closing protection device. When it is used, it can be combined with whether the upper-level ring main unit is powered and the detection information of the ring main unit itself. , accurately and reliably judge whether the ring main unit of this group is in a live state, and then correspondingly lock or unlock the operation hole of the grounding switch of the ring main unit of the same level, so that the maintenance personnel cannot operate the grounding switch of the ring main unit of the same level when the power is on. It can effectively avoid the misoperation of the maintenance personnel such as closing the grounding switch with electricity, and ensure the safety of personnel and equipment. (2) The ring main unit of the present utility model has the advantages of simple structure, convenient on-site installation and use, strong versatility, and is suitable for popularization.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of the present invention.

Detailed ways

The present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

(Example 1)

Referring to Fig. 1, the ring main unit of this embodiment is protected against grounding and closing, which is mainly composed of a first PT transformer, a second PT transformer, a controller and an electric lock tongue.

The first PT transformer is set at the incoming end of the ring main unit to collect the voltage signal at the incoming end of the ring main unit; the second PT transformer is placed at the outgoing end of the ring main unit to collect the voltage signal of the ring main unit. The voltage signal at the outlet end of the network cabinet. Both the first PT transformer and the second PT transformer are existing products purchased in the market.

The controller is mainly composed of a voltage sampling module, a wireless communication module, an MCU module, a relay and a power supply module; the input end of the voltage sampling module is electrically connected with the first PT transformer and the second PT transformer; the output end of the voltage sampling module is connected with the MCU The modules are electrically connected, and the voltage sampling module is used to sample the voltage signals detected by the first PT transformer and the second PT transformer and send them to the MCU module for logical judgment of whether there is voltage; the wireless communication module is electrically connected to the MCU module, and the wireless communication module When in use, it is used for communication between two adjacent ring network cabinets located at the upper and lower levels; the control end of the relay is electrically connected with the MCU module, and the on-off of the relay is controlled by the MCU; the electric lock tongue is electrically connected with the relay, and the Electricity and loss of power are controlled by relays. The electric lock tongue is a commercially available product. When the electric lock tongue is used, it is matched with the operation hole of the grounding switch of the ring network cabinet. The grounding switch of the cabinet is locked. At this time, the maintenance personnel cannot operate the grounding switch. When the electric lock tongue loses power, it exits the operation hole of the grounding switch to unlock the grounding switch of the ring main unit. At this time, the maintenance personnel can operate the grounding switch. The power module is used to provide working power for the device, and the power module takes power from the DC panel of the ring main unit or the instrument room.

The voltage sampling module, wireless communication module, MCU module and power supply module of the controller are all mature functional modules in the prior art, and their specific circuit structures are not described in detail.

The ring main unit of this embodiment is prevented from being grounded and closed. When it is in use, at least one set is installed on the ring main unit of the current level to be repaired and the ring main unit of the upper level adjacent to the ring main unit of the same level. When the voltage information detected by the second PT transformer installed at the outlet end of the upper-level ring main unit is sent to the controller of the ring main unit at the same level through its controller, the first PT transformer installed at the incoming end of the ring main unit at the same level detects the The voltage information is sent to the controller of the ring main unit at the same level at the same time, and the MCU module of the ring main unit controller of the current level can accurately and reliably judge whether the ring main unit of the current level is live according to the received 2-channel voltage information. The MCU module control relay of the level ring main unit controller turns on the power supply of the electric lock tongue, and the electric lock tongue is energized and inserted into the operation hole of the grounding switch to lock the grounding switch of the ring main unit, so that the maintenance personnel cannot operate the grounding switch; The ring main unit at this level is not electrified, the MCU module controls the relay to turn off the power supply of the electric lock bolt, and the electric lock bolt exits the operation hole of the grounding switch when the power is lost, thereby unlocking the grounding switch of the ring main unit. At this time, the maintenance personnel can operate the grounding switch. In this way, the maintenance personnel can effectively avoid misoperations such as electrified closing the grounding switch, and ensure the safety of personnel and equipment.

The above embodiment is an illustration of the specific embodiments of the present invention, rather than a limitation of the present invention. Those skilled in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the scope of patent protection of the present invention.

Claims (1)

1. a ring main unit is prevented from band grounding closing protection device, it is characterized in that: comprise the first PT transformer, the second PT transformer, controller and electric lock tongue; The first PT transformer is set at the incoming end of the ring main unit when in use, and is used to collect voltage signals at the incoming end of the ring main unit; the second PT transformer is placed at the outgoing end of the ring main unit when in use, and is used to collect the voltage signal at the incoming end of the ring main unit. The voltage signal at the outlet end of the ring main unit; the controller includes a voltage sampling module, a wireless communication module, an MCU module, a relay and a power supply module; the input end of the voltage sampling module is electrically connected to the first PT transformer and the second PT transformer. connection; the output end of the voltage sampling module is electrically connected to the MCU module; the wireless communication module is electrically connected to the MCU module, and the wireless communication module is used for communication between two adjacent ring main units; the relay is electrically connected to the MCU module; electric lock The tongue is electrically connected with the relay, and the power-on and power-off of the electric lock tongue is controlled by the relay; the power module is used to provide working power.

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