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

Abstract

The utility model provides a ring main unit earth-bound switching-on prevention protection device, which comprises a first PT mutual inductor arranged at the incoming line end of the ring main unit, a second PT mutual inductor arranged at the outgoing line end, a controller and an electric lock tongue; the controller comprises 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 mutual inductor and the second PT mutual inductor; the output end of the voltage sampling module is electrically connected with the MCU module; the wireless 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 supply. The utility model discloses whether can judge this level looped netowrk cabinet with electricity and corresponding shutting or open earthing switch's operation hole automatically during the use for the earthing switch of this level looped netowrk cabinet can not be operated to the maintainer when electrified, thereby can effectively avoid the maintainer to take place electrified closed earthing switch's maloperation, guarantee personnel's equipment safety.

Description

Ring main unit prevents taking earthing combined floodgate protection device

Technical Field

The utility model relates to a power supply line looped netowrk cabinet protection facility, concretely relates to looped netowrk cabinet prevents to take earthing combined floodgate protection device.

Background

In order to improve the reliability of power supply, power supply networks are usually connected in a ring, and this power supply mode is referred to as ring network power supply. The ring main unit is a switch cabinet arranged on each power distribution branch, and a bus of the switch cabinet is a part of a ring main line at the same time. The ring main unit is used as one of electrical equipment, plays the roles of a load switch and a fuse, and has wider and larger application range and larger role in power grid operation in China. In an electric power system, a 10kV ring main unit plays an important role in electric power transmission. For guaranteeing the normal good operation of looped netowrk cabinet, the maintenance of looped netowrk cabinet in the commissioning process is indispensable, and during the maintenance, the earthing switch of looped netowrk cabinet plays main guarantee effect to the equipment maintenance personnel personal safety. If the grounding switch is closed in an electrified way, the personal safety and the electricity utilization safety of maintainers can be seriously threatened, and a vicious liability accident is caused. If the coordination between the ring main unit positioned at the front end of the distribution line and the ring main unit positioned at the rear end to be overhauled is not good, the safety accidents are easy to occur. At present, a method for preventing a grounding switch from being closed in an electrified way when a ring main unit is overhauled mainly depends on manual operation ticket notification, site interphone communication coordination and the like, but 2 ring main units at the front end and the rear end are often far away from each other, the manual operation ticket and the interphone communication coordination are often inconvenient, manual coordination is easy to go wrong, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: in order to solve the technical problem in the background art, a ring main unit is provided with a protection device for preventing closing with grounding.

The technical scheme of the utility model is that: the utility model discloses a looped netowrk cabinet prevents to take earthing combined floodgate protection device, its structural feature is: the PT transformer control system comprises a first PT transformer, a second PT transformer, a controller and an electric lock tongue;

the first PT mutual inductor is arranged at the wire inlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire inlet end of the ring main unit; the second PT transformer is arranged at a wire outlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire outlet end of the ring main unit; the controller comprises 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 mutual inductor and the second PT mutual inductor; the output end of the voltage sampling module is electrically connected with the MCU module; the wireless communication module is electrically connected with the MCU module and is used for communication among 2 adjacent ring main units when in use; the relay is electrically connected with the MCU module; the electric lock tongue is electrically connected with the relay, and the power on and power off of the electric lock tongue are controlled by the relay; the power supply module is used for providing working power supply.

The utility model discloses has positive effect: (1) the utility model discloses a looped netowrk cabinet prevents taking earthing combined floodgate protection device, it is when using, can combine the detection information whether power transmission and this level looped netowrk cabinet self of higher level looped netowrk cabinet, judge accurately reliably whether this group's looped netowrk cabinet is in charged state, and then corresponding shutting or unblock this level looped netowrk cabinet's earthing switch's operation hole, make if electrified when the maintainer can not operate this level of looped netowrk cabinet's earthing switch, thereby can effectively avoid the maintainer to take place maloperation such as electrified closed earthing switch, guarantee personnel's equipment safety. (2) The utility model discloses a looped netowrk cabinet prevents to take earthing combined floodgate protection device, simple structure, field installation, convenient to use, the commonality is strong, is suitable for the popularization.

Drawings

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

Detailed Description

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

(example 1)

See fig. 1, the ring main unit of this embodiment prevents taking the earth to close a floodgate protection device, mainly comprises first PT mutual-inductor, second PT mutual-inductor, controller and electric bolt.

The first PT transformer is arranged at the wire inlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire inlet end of the ring main unit; the second PT mutual inductor is arranged at the wire outlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire outlet end of the ring main unit. The first PT mutual inductor and the second PT mutual inductor are both manufactured by existing products purchased in the market.

The controller mainly comprises 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 mutual inductor and the second PT mutual inductor; the output end of the voltage sampling module is electrically connected with the MCU module, and the voltage sampling module is used for sampling voltage signals detected by the first PT mutual inductor and the second PT mutual inductor and sending the voltage signals to the MCU module to carry out logical judgment on whether voltage exists or not; the wireless communication module is electrically connected with the MCU module and is used for communication among 2 adjacent ring main units at the upper and lower stages when in use; the control end of the relay is electrically connected with the MCU module, and the on-off state of the relay is controlled by the MCU; electric lock tongue is connected with the relay electricity, electric lock tongue's the electricity of getting and losing are controlled by the relay, electric lock tongue is the market purchase product, electric lock tongue during the use with the earthing switch's of looped netowrk cabinet operating hole cooperation, the action inserts earthing switch's operating hole locking with the earthing switch's of action when electric lock tongue gets the electricity, the earthing switch can not be operated to the maintainer this moment, thereby the earthing switch unblock with the looped netowrk cabinet of earthing switch's operating hole is then withdrawed from when electric lock tongue loses the electricity, the maintainer can operate earthing switch this moment. The power module is used for providing a working power supply for the device, and the power module obtains electricity from a direct current screen of the ring main unit or an instrument room.

The voltage sampling module, the wireless communication module, the MCU module and the power module of the controller are all mature functional modules in the prior art, and the specific circuit structure is not detailed.

The ring main unit of the embodiment is provided with 1 set of protection device for preventing earth-bound switching-on, when in use, at least on the ring main unit of the current stage to be overhauled and the ring main unit of the previous stage adjacent to the ring main unit of the current stage, when in use, the voltage information detected by the second PT mutual inductor arranged at the wire outlet end of the ring main unit of the previous stage is sent to the controller of the ring main unit of the current stage through the controller, the voltage information detected by the first PT mutual inductor arranged at the wire inlet end of the ring main unit of the current stage is simultaneously sent to the controller of the ring main unit of the current stage, the MCU module of the controller of the ring main unit of the current stage ensures accurate and reliable judgment whether the ring main unit of the current stage is, the MCU module of the ring main unit controller controls the relay to switch on the power supply of the electric spring bolt, the electric spring bolt is electrified and inserted into an operation hole of the grounding switch to lock the grounding switch of the ring main unit, so that a maintainer cannot operate the grounding switch; if it is uncharged to judge this level looped netowrk cabinet, MCU module control relay turn-offs electric spring bolt power, thereby electric spring bolt loses the electric operating hole that withdraws from earthing switch unblock with the earthing switch of looped netowrk cabinet, and maintainer can operate earthing switch this moment. Therefore, misoperation such as electrified closing of the grounding switch can be effectively avoided for maintainers, and safety of personnel and equipment is guaranteed.

The above embodiments are illustrative of the specific embodiments of the present invention, but not limiting to the present invention, and those skilled in the relevant art can also make various changes and modifications to obtain the equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should fall under the protection scope of the present invention.

Claims (1)

1. The utility model provides a looped netowrk cabinet prevents taking earthing combined floodgate protection device which characterized in that: the PT transformer control system comprises a first PT transformer, a second PT transformer, a controller and an electric lock tongue;

the first PT mutual inductor is arranged at the wire inlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire inlet end of the ring main unit; the second PT transformer is arranged at a wire outlet end of the ring main unit when in use and is used for acquiring a voltage signal of the wire outlet end of the ring main unit; the controller comprises 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 mutual inductor and the second PT mutual inductor; the output end of the voltage sampling module is electrically connected with the MCU module; the wireless communication module is electrically connected with the MCU module and is used for communication among 2 adjacent ring main units when in use; the relay is electrically connected with the MCU module; the electric lock tongue is electrically connected with the relay, and the power on and power off of the electric lock tongue are controlled by the relay; the power supply module is used for providing working power supply.

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