CN201174621Y

CN201174621Y - Automatic switching control apparatus of double power supply

Info

Publication number: CN201174621Y
Application number: CNU2008200852711U
Authority: CN
Inventors: 徐德勤
Original assignee: TIANAN (GROUP) CO Ltd NINGBO CITY
Current assignee: TIANAN (GROUP) CO Ltd NINGBO CITY
Priority date: 2008-03-28
Filing date: 2008-03-28
Publication date: 2008-12-31
Anticipated expiration: 2018-03-28

Abstract

The utility model provides a double power supply automatic switching control device, used for power supply and power distribution. The device comprises a power supply acquisition return circuit, a power supply testing circuit and a switching control unit, wherein the power supply acquisition return circuit obtains the working power supply from a No. 1 power supply or No. 2 power supply of an electric network incoming line; the power supply testing circuit tests voltages of the No. 1 power supply and the No. 2 power supply respectively; the switching control unit consists of a function select circuit, a time delay circuit and a main controller; and the main controller is the PLC-programmable controller. The device of the utility model can edit, debug and read-write logical programs by using PC software, and has the advantages of small volume, small number of elements, simple circuit structure and high reliability; under the condition of not changing hardware and wire connection, the device can change the double power supply switching control logic, so that the device has higher flexibility; the PLC outputs passive contacts to control two breakers by which an incoming line and a bus line are communicated, so that the device can be matched with all types of switches, and the application range is wide.

Description

Dual-power automatic switchover control device

Technical field

The utility model relates to the circuit arrangement technical field of power supply or distribution, especially relates to the circuit arrangement of changing automatically from standby each other power supply.

Background technology

In low-voltage distribution system, adopt the operational mode of double loop power supply inlet wire sectionalized single busbar connection to be in the great majority, as shown in Figure 1,1# power supply and 2# power supply are by two lead-in circuit breaker 1ZK, 2ZK, give two sections bus I, II power supplies respectively, two sections buses connect by bus-tie circuit breaker 3ZK again; For improving the power supply reliability of this distribution system, require under the situation of one road power supply dead electricity or fault, the bar coupler that closes is given the dead electricity bussed supply by normal power source; When switchgear house is unattended, can realize quick automatic switching by the double loop power supply automatic switching control device; At present duplicate supply is automaticallyed switch to control two kinds of schemes are arranged, a kind of is voltage relay by One's name is legion, the time relay, discrete element such as auxiliary relay is formed control circuit, the shortcoming of this scheme is that element is many, the wiring complexity, bring the reliability of control circuit to reduce thus, and the auxiliary to controlled switch requires high, as need the auxiliary contact more than the switch output fourth officer to use for control circuit, sometimes often be difficult to realize, this control circuit can only be realized the simple occasion of control logic simultaneously, not being suitable for control has relatively high expectations, the occasion of control logic complexity, and in a single day the control route finishes installation, the just very difficult change control logic of user; Another kind of controlling schemes is to use the supporting duplicate supply automatic switchover controller of part switch producer to control, the shortcoming of this scheme is to cost an arm and a leg, and volume is big, and difficulty is installed, and versatility is also poor, and the product of a brand can only be supporting with the switch of same producer.

Summary of the invention

The purpose of this utility model is the deficiency at above-mentioned prior art, provide a kind of element few, therefore volume is little, and circuit is simple relatively, can change control logic as required, antijamming capability is strong, the reliability height, cost is low, and is multiple functional, the cost performance height, the dual-power automatic switchover control device of applied range in low-voltage distribution system.

For achieving the above object, the technical solution adopted in the utility model is such: a kind of dual-power automatic switchover control device comprises that power supply obtains the loop, power sense circuit, switch control unit; In switch control unit, adopt the PLC---programmable controller as master controller, to carry out logical storage, logic determines and output signal control; By no two inlet wires of source contact control of PLC output and bus-tie circuit breaker; Comprise also that in switch control unit a change over switch HK is as the function selecting element, change over switch is connected to the input of master controller, the user can select " hauling oneself willingly into runback ", " manually ", " hauling oneself willingly into not runback " three kinds of mode of operations by change over switch, after the input of master controller identification change over switch device is placed the corresponding work mode operation; Also comprise a time relay as delay cell in switch control unit, time relay output connects the master controller input, can be switched after how long power failure prolongs by on-the-spot setting of user, to take into account fail safe; Said power supply obtains the loop, and its function is to obtain the AC220V working power, uses for the PLC in the master controller; Said power sense circuit is connected to the input of master controller, master controller is by the operating state of the monitoring of the voltage relay in power sense circuit two-way power supply, when the operating state of power supply changes, voltage relay sends corresponding power supply dead electricity or gets the signal of telecommunication to master controller, and master controller responds according to the logic of setting.

Owing to adopted technique scheme, a kind of dual-power automatic switchover control device of the present utility model, because of the PLC standardization level is good, available PC software editing, debugging, read-write logical program not only make device volume little, number of elements is few, circuit is simple, the reliability height, and can be under the situation that does not change any hardware and wiring, change the duplicate supply switch control logic, make device that greater flexibility be arranged; No two inlet wires of source contact control of PLC output and bus-tie circuit breaker make device can be used applied range with the switch of disposable type structure.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the single-trunk segmental wiring figure in the background technology.

Fig. 2 is a circuit block diagram of the present utility model.

Fig. 3 is the winding diagram that the utility model is formed 6 switch control units.

Fig. 4 is that the

utility model forms

4,1# power sense circuit schematic diagram.

Fig. 5 is that the utility model forms 5,2# power sense circuit schematic diagram.

Fig. 6 is that the

utility model composition

1,2,3 power supplys obtain the winding diagram in loop.

Embodiment

Shown in accompanying drawing 2, a kind of dual-power automatic switchover control device comprises that the power supply of being made up of device working power acquisition cuicuit 1 and device electric power loop 2,3 obtains the loop,

power sense circuit

4,5, switch control unit 6; Said switch control unit 6 is made up of function selector circuit 7, delay circuit 8, master controller 9; Said master controller 9 is to adopt the PLC---programmable controller to carry out logical storage, logic determines and output signal control; By no source contact control two lead-in circuit breaker 1ZK, 2ZK of PLC output and bus-tie circuit breaker 3ZK; Said function selector circuit 7 is as the function selecting element with change over switch HK, change over switch HK is connected to the input of master controller 9, the user can select " hauling oneself willingly into runback ", " manually ", " hauling oneself willingly into not runback " three kinds of mode of operations by change over switch, after the input of master controller identification change over switch device is placed the corresponding work mode operation; As delay cell, time relay 1SJ output connects master controller 9 inputs to said delay circuit 8 with time relay 1SJ, can be switched after how long power failure prolongs by on-the-spot setting of user, to take into account fail safe; Said power supply obtains

loop

1,2,3, and its function is to obtain the AC220V working power, uses for the PLC in the master controller; Said power supply detects the input that loop 4,5 is connected to master controller 9, master controller 9 is by the operating state of the monitoring of the voltage relay in power sense circuit two-way power supply, when the operating state of power supply changes, voltage relay sends corresponding power supply dead electricity or gets the signal of telecommunication to master controller, and master controller responds according to the logic of setting.

Shown in accompanying drawing 3, switch control unit 6 of the present utility model adopts the PLC---programmable controller as master controller 9, and the L1 of PLC end and N end are the working power input, and wherein the L1 end joins through protection fuse 1RD and little bus KMB; It is 12 tunnel inputs that the PLC minimalist configuration requires, 8 tunnel outputs; 12 tunnel inputs are respectively: I1, I2, I3, I4, I5, I6, I7, I8, I9, I10, I11, I12, wherein I1, I2, I3 respectively with two lead-in circuit breaker 1ZK, 2ZK, and bus-tie circuit breaker 3ZK connects the input switching signal; I4, I5, I6 and change over switch HK join, and select " hauling oneself willingly into runback ", " manually ", " hauling oneself willingly into not runback " three kinds of mode of operations; I7, I8 are connected in series 11YJ after meeting voltage relay 12YJ respectively, and are connected in series 21YJ after meeting voltage relay 22YJ, gather the power work state; I9 meets time relay 1SJ, the input time delay signal; I10, I11, I12 respectively with two lead-in circuit breaker 1ZK, 2ZK, and bus-tie circuit breaker 3ZK connects monitoring inlet wire fault; Said 8 tunnel outputs are respectively: Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, and wherein Q1, Q2 tap into line circuit breaker 1ZK respectively, the action of instruction divide-shut brake; Q3, Q4 tap into line circuit breaker 2ZK respectively, the action of instruction divide-shut brake; Q5, Q6 meet network interconnecting circuit 3ZK respectively, the action of instruction divide-shut brake; Q7 meets time relay 1SJ, and start-up time, relay was delayed time; Q8 connects the conversion switch, the action of instruction automatic bus;

Accompanying drawing 6 is seen in said little bus KMB wiring, this figure is that power supply obtains the loop, A, the C of the lead-in circuit breaker 1ZK of 1# power supply goes up mutually auxiliary relay 1ZJ is installed, auxiliary relay 1ZJ serial connection protection fuse 11RD, 12RD, little bus KMB is connected with the B of lead-in circuit breaker 1ZK by the three secondary normally opened contacts of auxiliary relay 1ZJ, and be connected serial connection protection fuse 9RD, 10RD respectively on line with the B of 2# electric power incoming line circuit breaker 2ZK by the three secondary normally-closed contacts of auxiliary relay 1ZJ; To increase switching capacity, when the 1# power failure, the three secondary normally opened contact disjunctions of auxiliary relay 1ZJ, three secondary normally-closed contact closures are connected the 2# power supply;

By shown in Figure 4,1# power sense circuit 4 is connected with A, the B of the lead-in circuit breaker 1ZK of 1# power supply through protection fuse 3RD, 4RD by voltage relay 11YJ, voltage relay 12YJ is connected with B, the C of the lead-in circuit breaker 1ZK of 1# power supply through protection fuse 4RD, 5RD, receives the PLC input in the switch control unit behind the contact polyphone of voltage relay 11YJ and 12YJ; When the arbitrary phase voltage of 1# power supply is unusual, the relevant voltage relay just can move, and the PLC in switch control unit sends power failure signal;

By shown in Figure 5,2# power sense circuit 5 principles and 4 together, be connected with A, the B of 2ZK through 6RD, 7RD by voltage relay 21YJ, voltage relay 22YJ is connected with B, the C of 2ZK through 7RD, 8RD, receives the PLC input in the switch control unit behind the contact polyphone of voltage relay 21YJ and 22YJ.

Claims

1, a kind of dual-power automatic switchover control device, comprise that power supply obtains the loop, power sense circuit (4,5), switch control unit (6), it is characterized in that: said power supply obtains the loop, is the working power from the 1# power supply or the 2# power supply acquisition device of electrical network inlet wire; Said power sense circuit (4,5) is to detect 1# power supply, 2# power source voltage respectively by voltage relay 11YJ and 12YJ and 21YJ and 22YJ, and testing result is transported to switch control unit (6); Said switch control unit (6) is made up of function selector circuit (7), delay circuit (8), master controller (9); Said master controller (9) is to adopt the PLC---programmable controller, and PLC connects 1# power supply and 2# power supply two lead-in circuit breaker 1ZK, 2ZK and bus-tie circuit breaker 3ZK respectively, and also linkage function is selected circuit (7) and delay circuit (8) simultaneously.

2, a kind of dual-power automatic switchover control device according to claim 1 is characterized in that: it is 12 tunnel inputs that said PLC minimalist configuration requires, 8 tunnel outputs.