CN201153219Y

CN201153219Y - Auto-switch-on ring network cabinet for PLC controlled double electricity supply

Info

Publication number: CN201153219Y
Application number: CNU2007201052935U
Authority: CN
Inventors: 杜显昌; 柴红连; 邹保金
Original assignee: Yunan Tongbian Electric Appliance Co High-Low Press Complex Equipment Facto
Current assignee: Yunan Tongbian Electric Appliance Co High-Low Press Complex Equipment Facto
Priority date: 2007-12-29
Filing date: 2007-12-29
Publication date: 2008-11-19
Anticipated expiration: 2017-12-29

Abstract

The utility model relates to a ring main unit of a duplicate-supply backup power auto-control device controlled by a PLC, which comprises a duplicate-supply self ringer network cabinet. The duplicate-supply self ringer network cabinet is characterized in that the PLC which has the duplicate-supply necessary-linkage in the program is adopted; the input end of the PLC has six incoming lines that are the switching value of a 1<#> breaker, the switching value of a 2<#> breaker, a fault signal of phase failure and phase lack of the three phases of a 1<#> power supply, the fault signal of phase failure and phase lack of the three phases of a 2# powder supply, the functional mode of the 1<#> power supply, and the functional mode of a 2<#> powder supply; four groups of signals comprise an opening signal and a switching signal of the 1<#> breaker, and the opening signal and the switching signal of the 2<#> breaker; the external lines of the whole PLC comprise six incoming lines and four groups of outlet lines. The ring main unit utilizes the PLC to control the duplicate-supply backup power auto-control device; the problems existing in the prior art are solved completely, and the technology of the backup power auto-control device is more perfect than the prior art; the phase failure and phase lack protection of the three phases is increased; the power supply with safer and more reliable performance is provided to a user.

Description

PLC control duplicate supply prepared auto restart ring main unit

Technical field

The utility model relates to electric apparatus control apparatus, the duplicate supply prepared auto restart (XGN15-12) of PLC control specifically ring main unit.

Background technology

The XGN15-12 type is modular, modularization sulfur hexafluoride ring network cabinet is a new generation with sulphur hexafloride circuit breaker as main switch and whole cabinet adopts air insulation, is used for power distribution automation, both open-ended metal enclosed switchgears of compactness, have simple in structure, flexible operation, interlocking reliable, easy for installation, safeguard characteristics such as simple, all can provide gratifying effect to various application scenario, different customer requirements.

Because the user is to improving constantly and the uninterrupted requirement of important department to power supply that power supply quality requires, the method that duplicate supply even multiple feed have occurred, and generally use now maximum still dual power supplies, the situation of powering simultaneously so for the two-way power supply, how to accomplish this duplex feeding power supply of automatic switching? at present use maximum control methods to have two kinds on the market, one be exactly service time relay and auxiliary relay carry out chain control; It two just is to use integrated circuit to control.In the middle of first method, owing to used a large amount of auxiliary relays and the time relay to control, the outside mode of connection is more loaded down with trivial details, the wiring tap of extracting out is a lot, has strengthened direct labor's the amount of labour in the middle of producing, and because the end of a thread is too many, the probability that breaks down is very big, the common in addition time relay is relative with the auxiliary relay accuracy relatively poor, and that wears out after frequent the use is very fast, so the fault probability is very high in the middle of this scheme.The second way is to use integrated circuit board to control, this method is used more, it all has been integrated in the connection of the outside line in the middle of first kind of control method above the wiring board, simplified outside line greatly, but because in the control of the duplicate supply of 10kV level, can provide by the PT instrument transformer to the 220V power supply that wiring board provides, because the fluctuation of voltage is very big in the fluctuation range that PT instrument transformer secondary side induces 220V voltage in the 10kV level circuit, caused the instability of power supply, well beyond the operating voltage fluctuation range of integrated circuit permission, frequently burning out of integrated circuit board can appear, situation about damaging, and producing integrated circuit board, to carry out the controlling unit of duplicate supply prepared auto restart more, increases the manufacturing cost of knowing clearly.

Summary of the invention

The purpose of this utility model provides the ring main unit that a small-sized PLC of a kind of usefulness (Programmable Logic Controller) carries out the prepared auto restart control of duplicate supply.It can solve technical problems such as common relay inaccuracy, outside line complexity and integrated circuit are not durable.

Realize the purpose of this utility model with following technical scheme:

1, only need be the working condition of the working condition of the 1# power supply of outside, 2# power supply input PLC, PLC just can realize overall monitor and the control to prepared auto restart.Possessed the necessary chain PLC of duplicate supply in the employing program, input at PLC has 6 incoming lines, that is: the fault-signal of the switching value of the switching value of 1# circuit breaker, 2# circuit breaker, the phase failure of 1# power supply three-phase, phase shortage, the phase failure of 2# power supply three-phase, the fault-signal of phase shortage, 1# power work state, 2# power work state; 4 groups of output signals: the divide-shut brake signal of 1# circuit breaker, the divide-shut brake signal of 2# circuit breaker, the outside line of The whole control have only 6 incoming lines and 4 groups of outlet lines, and with respect to control in the past, outside line has been simplified greatly.

2, adopt PLC to carry out the prepared auto restart control of duplicate supply, at first to solve the power supply problem of PLC, because power supply is to be used as the power supply of PLC and the divide-shut brake power supply of circuit breaker by being installed in the transformer induced 220V power supply that goes out of PT in the middle of the electric power incoming line cabinet, as long as the 10kV side fault or the outage of incoming line cabinet, the transformer induced 220V power supply that goes out of PT is also just along with disappearance.Therefore, all added the PT instrument transformer at main power supply and stand-by power supply side, after the main power supply dead electricity, to power to PLC by the 220V power supply that stand-by power supply induces, the working power that disconnects main power supply and close stand-by power supply is provided simultaneously, and the PT power supply that carries out this two-way 220V with a common auxiliary relay switches mutually.

The utility model uses PLC to control the prepared auto restart of duplicate supply, has solved problems of the prior art fully, and the technology of prepared auto restart is than more perfect in the past.Increased the three-phase phase failure of power supply, the protection of scarce elephant, the power supply of safety and reliability is provided for the user.Mode compared with the common time relay and the chain control of auxiliary relay is more accurate, perfect, is more conducive to the batch process of producer.Its stability and reliability have also surmounted the integrated circuit control mode greatly.Make product have more the market competitiveness.

Description of drawings

Fig. 1 is a duplicate supply prepared auto restart ring main unit main power source input circuit schematic diagram of the present utility model;

Fig. 2 is a duplicate supply prepared auto restart ring main unit stand-by power supply input circuit schematic diagram of the present utility model;

Among Fig. 1, Fig. 2, S1 is Switch main body combined floodgate limit switch, and S2 is Switch main body separating brake limit switch, and S3 is cabinet gate interlock auxiliary switch, and M is Switch main body on/off switch motor, annotates 1 and is the locked loop that switch closes a floodgate.

Embodiment

1, working power:

All added the PT instrument transformer at main power supply and stand-by power supply side, after the main power supply dead electricity, to power to PLC by the 220V power supply that stand-by power supply induces, the working power that disconnects main power supply and close stand-by power supply is provided simultaneously, and the PT power supply that carries out this two-way 220V with a common auxiliary relay switches mutually.The voltage that main power supply PT collects is L1, N1, the voltage that stand-by power supply collects is L2, N2, L1, N1 seals in the coil of auxiliary relay KA, and L1, N1 inserts the normally opened contact of auxiliary relay, L2, N2 inserts the normally-closed contact of auxiliary relay, work as L1, in the time of N1 normal power supply (being that main power supply is normal), the adhesive of auxiliary relay coil, its normally opened contact closure, normally-closed contact disconnects, by L1, N1 deciliter provides working power, L1 for PLC and circuit breaker, in the time of N1 dead electricity (being the main power supply fault), the KA coil losing electricity, often opening gets an electric shock often to become opens, and it is normally closed that normally closed electric shock recovers, and this moment will be by L2, N2 deciliter provides working power by normally-closed contact for PLC and circuit breaker, so just well solved the switching problem between the two-way working power, PLC and equipment all have normal working power.

2, dual-power automatic switching control:

At first in the middle of the program of PLC inner setting, possessed the chain of duplicate supply necessity, only need be the fault-signal of the fault-signal of the switching value of the switching value of the working condition of the working condition of the 1# power supply of outside, 2# power supply, 1# circuit breaker, 2# circuit breaker, the phase failure of 1# power supply three-phase, phase shortage, the phase failure of 2# power supply three-phase, phase shortage input PLC, 1# power work state, 2# power work state; Output at PLC, 4 groups of signals have only been exported, that is: the divide-shut brake signal of the divide-shut brake signal of 1# circuit breaker, 2# circuit breaker, PLC just can realize overall monitor and the control to prepared auto restart, has only 6 incoming lines and 4 groups of outlet lines so be equivalent to the outside line of our The whole control.That is: PLCX ₀Be 1# power work status signal input; PLCX ₁Be 2# power work status signal input; PLCX ₂Be 1# mains switch switching value input; PLCX ₃Be 2# mains switch switching value input; PLCX ₄Be disconnected of 1# power supply, default phase signal input; PLCX ₅Be disconnected of 2# power supply, default phase signal input.PLC output: PLCY ₀End is 1# power supply, switching signal output; PLCY ₁End is 1# power supply, switching signal output (among Fig. 1); PLCY ₂End is 2# power supply, switching signal output; PLCY ₃End is 2# power supply, switching signal output (among Fig. 2).Charged show circuit is continued to use prior art.

Claims

1, a kind of PLC control duplicate supply prepared auto restart ring main unit, comprise duplicate supply prepared auto restart ring main unit, it is characterized in that having possessed in the employing program the necessary chain PLC of duplicate supply, input at PLC has 6 incoming lines, that is: the switching value of 1# circuit breaker, the switching value of 2# circuit breaker, the phase failure of 1# power supply three-phase, the fault-signal of phase shortage, the phase failure of 2# power supply three-phase, the fault-signal of phase shortage, 1# power work state, 2# power work state, 4 groups of output signals: the divide-shut brake signal of 1# circuit breaker, the divide-shut brake signal of 2# circuit breaker, the outside line of The whole control have 6 incoming lines and 4 groups of outlet lines.