CN215835189U

CN215835189U - Electrical control cabinet used in pit

Info

Publication number: CN215835189U
Application number: CN202121881242.8U
Authority: CN
Inventors: 何亮; 隰桂吉; 钱忠; 张正国; 刘国海
Original assignee: NANJING GAOLI ENGINEERING MACHINERY CO LTD
Current assignee: NANJING GAOLI ENGINEERING MACHINERY CO LTD
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2022-02-15
Anticipated expiration: 2031-08-11

Abstract

The utility model discloses an electric control cabinet suitable for a pit, which comprises: the device comprises a dual-power automatic transfer switch, a PLC control module, a relay, a wiring terminal, a standby power supply and a common power supply. According to the utility model, the dual-power automatic transfer switch and the standby power supply are installed, when the ring main unit fails and has power failure, the electrical control cabinet can be effectively converted into the standby power supply to enable the standby power supply to continue to operate, the PLC in the ring main unit is well protected, and the practical range is wider.

Description

Electrical control cabinet used in pit

Technical Field

The utility model relates to the field of sunk-well type ring main units, in particular to an electrical control cabinet used in a well pit.

Background

With the development of automation technology, the automation degree of various devices is higher and higher, the automation technology plays an increasingly significant role in the process of human transformation, and the electrical control cabinet is generated under the large environment.

Under the background of the development of automation technology, the electrical control cabinet is rapidly developed and more applied in the field of electrical automation. The control cabinet is mainly characterized in that switch equipment, measuring instruments, protective electrical appliances and auxiliary equipment are assembled in a closed or semi-closed metal cabinet or on a screen according to the electrical wiring requirements, the arrangement of the control cabinet meets the requirements of normal operation of an electric power system, the control cabinet is convenient to overhaul, and the safety of surrounding people and equipment is not damaged.

The electric control cabinet is internally provided with various electric elements for protection and control, and under the protection and control of the electric elements, the electric automation equipment can safely, stably and reliably provide services for people. However, if the power failure phenomenon occurs in the ring main unit in the pit, the electric control cabinet cannot be electrified, and the maintenance personnel cannot control the lifting platform to check the problems and maintain the ring main unit.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides the following technical scheme:

an electrical control cabinet suitable for a well pit comprises a dual-power automatic transfer switch, a PLC control module, a relay, a wiring terminal, a standby power supply and a common power supply. The common power supply and the standby power supply are respectively connected to the double-power-supply automatic transfer switch; the PLC control module is used as a core module of the control system; the relay is connected to the lower end of the PLC control module and serves as a transfer station of an output port of the PLC control module. The wiring terminal is used for connecting the inside and outside electricity of the electrical cabinet, and maintenance is facilitated.

When the power failure condition of the common power supply occurs, the operation is switched to the standby power supply, and the following steps are carried out:

the method comprises the following steps: when the common power supply fails, the dual-power automatic transfer switch disconnects the common power supply end breakers one by one;

step two: the dual-power automatic transfer switch knob is switched to the standby power supply end, starts the standby power supply and is connected with the standby power supply end circuit breaker.

The detailed steps are as follows:

first, when power is lost due to a cause and power cannot be recovered in a short time, the standby power supply must be started:

firstly, all circuit breakers powered by a common power supply are cut off, a double-throw reverse-feeding prevention switch is pulled to one side of a standby power supply, and the standby power supply circuit breaker in a double-power supply switching box is kept in a disconnected state.

Secondly, the standby power supply is started, and when the standby set operates normally, the air switch of the generator and the circuit breakers in the standby power supply control cabinet are closed in sequence.

And thirdly, closing all the standby power supply circuit breakers in the power supply switching box one by one and transmitting power to all the loads.

And fourthly, during the operation of the standby power supply, the operator on duty does not leave the generator set, and timely adjusts the voltage, the plant frequency and the like according to the change of the load, so as to timely deal with the abnormity.

Secondly, when the power supply of the common power supply is recovered:

firstly, the circuit breakers of the standby power supply are disconnected one by one in sequence, wherein the sequence is as follows: the circuit breaker of the standby power supply of the double power supply switching box → each circuit breaker of the standby power supply distribution cabinet → the main switch of the generator → the double throw switch is pushed to the power supply side of the common power supply.

Secondly, closing the circuit breakers one by one from the common power supply main switch to the shunt switches in sequence, and placing the common power supply circuit breakers of the double-power supply switching box at a closing position.

Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

the required roughly of normal electrical control cabinet is empty to open, PLC, relay, binding post etc. and this time to having added dual supply automatic transfer switch, when making electrical control cabinet in the pit, can not lead to PLC in the cabinet to go wrong because of the outage, can not be because of having a power failure stop work to the electrical apparatus that electrical control cabinet controlled moreover, very big has made things convenient for relevant personnel in time to monitor and maintain.

Drawings

Fig. 1 is a schematic diagram of an electrical control cabinet suitable for use in a well.

Fig. 2 is a schematic diagram of a 3P dual power transfer switch.

Fig. 3 is a schematic diagram of a 4P dual power transfer switch.

Wherein N1 and N2 are zero lines, and U1, U2, V1, V2, W1 and W2 are live lines.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, an electrical control cabinet suitable for use in a pit includes: the system comprises a dual-power automatic transfer switch, a PLC control module, a relay, a wiring terminal, a common power supply and a standby power supply.

The common power supply and the standby power supply are respectively connected to the double-power-supply conversion switch, and only the common power supply is switched on under the normal condition; when the common power supply fails and stops, the dual-power transfer switch is switched to the standby power supply.

The PLC module is connected behind the dual-power transfer switch, and can be called as a PLC module, all kinds of operations of the electrical cabinet are controlled mainly by an internal program, and the electrical cabinet needs stable performance, reliable operation, high cost performance, simplicity and practicability.

Basically, the PLC module is connected with a relay, and generally, the PLC module can directly send instructions to a control loop, but the PLC module can also be transferred by the relay firstly.

The wiring terminal is arranged behind the relay, is an indispensable object for each electrical cabinet and can be equipped according to the number of signals.

Referring to fig. 2 and fig. 3, the dual power automatic transfer switch is connected to the incoming and outgoing lines U1, V1, W1 and the neutral line N1 of the common power supply, the incoming and outgoing lines U2, V2, W2 and the neutral line N2 of the standby power supply, the outgoing lines L1, L2 and L3 of the two circuit breakers are connected in parallel, and the phase sequence must be kept consistent according to the wiring requirement.

As shown in fig. 3, the four-pole (4P) dual-power automatic transfer switch has the zero (N) lines separated individually and connected to the zero (N) lines of the main power grid and the standby power grid respectively.

The zero line of the three-pole (3P) dual-power automatic transfer switch shown in fig. 2 has two connections: one is that the zero (N) lines of the regular power supply and the standby power supply are separately separated. And the other is that the zero lines of the common power supply and the standby power supply are connected together. When the zero lines of the common power supply and the standby power supply are communicated together, the circuit of the common power supply or the circuit of the standby power supply cannot be provided with the residual current operated circuit breaker at the upper stage of the dual-power automatic transfer switch, otherwise, the residual current operated circuit breaker can automatically trip when the dual-power automatic transfer switch is switched.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An electrical control cabinet used in a pit is characterized by comprising a dual-power automatic transfer switch, a PLC control module, a relay, a wiring terminal, a standby power supply and a common power supply; the common power supply and the standby power supply are connected to the dual-power-supply change-over switch, the PLC module is connected to the lower end of the dual-power-supply change-over switch, the relay is connected to the lower end of the PLC module, and the wiring terminal is connected with the inside and outside electric of the electric cabinet.