CN2110914U

CN2110914U - Dual-power auto-interlocking switching device

Info

Publication number: CN2110914U
Application number: CN 92211064
Authority: CN
Inventors: 阎立新; 马圣祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-01-10
Filing date: 1992-01-10
Publication date: 1992-07-22

Abstract

The utility model is composed of a control screen, a voltmeter, a signal lamp, a knife, a switch, and AC contactors. The utility model uses the mutual latching of the normally-closed contacts of two AC contactors which are arranged in a control circuit to realize duplicate-supply automatic mutual-locking switching. The utility model is suitable for a generator room and a power distribution room when only one person is on duty. The utility model is particularly suitable for a power generating room and a power distribution room of a small-size oil store and a gas station or for a duplicate-supply unit.

Description

Dual-power auto-interlocking switching device

The utility model is a power transfer device, particularly a kind ofly can connect stand-by power supply automatically when grid power blackout, and behind the electrical network incoming call, stand-by power supply outage, can connect the duplicate supply self interlocking switching device shifter of electric network source again automatically.

Existing duplicate supply switches, and is with a double-throw knife switch, and when grid power blackout, double-throw switch disconnects power network line, switches to the stand-by power supply circuit, disconnects the stand-by power supply circuit again and switch to power network line behind the electrical network incoming call.

The purpose of this utility model is when electric network source has a power failure, and makes electric network source automatic disconnection loaded line, and stand-by power supply generating back is dropped into loaded line automatically.When the electrical network incoming call, after stand-by power supply had a power failure, electric network source dropped into loaded line automatically.Realize that with two A.C. contactors duplicate supply automaticallyes switch, replace the work of artificial deciliter double-throw knife switch, the sparkover when having reduced artificial deciliter disconnecting link, the switchgear house of sending out that is particularly suitable for small-sized oil depot is used.

Accompanying drawing Fig. 1 of the present utility model is electrical control circuit figure; Fig. 2 is the front schematic view of control flow 5; Fig. 3 is the schematic rear view of control flow 5.

Describing circuit of the present utility model in detail below in conjunction with accompanying drawing 1 connects.The power network line input is connected to indicator light 1, knife switch 2, the coil 6-1 of A.C. contactor 6 connects the normally opened contact 6-4 of knife switch and A.C. contactor 6, two normally-closed contact 7-2 of the other end of coil 6-1 series connection A.C. contactor 7 and 7-3, the other end of normally-closed contact 7-3 connects the normally opened contact 6-5 of knife switch 2 and A.C. contactor 6.The input of stand-by power supply circuit is connected to knife switch 4, the coil 7-1 of A.C. contactor connects the normally opened contact 7-4 of knife switch 4 and A.C. contactor 7, and two normally-closed contact 6-2 of the other end series connection A.C. contactor 6 of coil 7-1 are connected the normally opened contact 7-5 of knife switch 4 and A.C. contactor 7 with the other end of 6-3, normally-closed contact 6-3.The normally opened contact 6-4 of public output is connected normally opened contact 7-4,7-5 respectively with 6-5, at output voltmeter 3 in parallel.

Below in conjunction with Fig. 1, describe circuit working principle of the present utility model in detail.Knife switch 2 and knife switch 3 are all in make position, and normally power network line is powered.Coil 6-1 loses voltage when grid power blackout, normally opened contact 6-4,6-5 disconnects, this moment, voltmeter 3 was zero, be connected on two normally-closed contact 6-2 in the coil 7-1 loop, the 6-3 closure, at this moment after generator or another road power supply drop into, stand-by power supply send, by knife switch 4, the voltage of stand-by power supply is added on the coil 7-1, normally opened contact 7-4, the 7-5 closure, voltmeter 3 indicates the magnitude of voltage that stand-by power supply is sent to load, at this moment two normally-closed contact 7-2 in Chuan Lian the coil 6-1 loop, 7-3 disconnects, make coil 6-1 locking, even sending a telegram here again, electrical network also adds less than on the coil 6-1, normally opened contact 6-4,6-5 is not closed, the electricity of electrical network just send less than loaded line, behind the electrical network incoming call, the electric network source indicator light is bright, the operator on duty turns off generator or another road power supply, stand-by power supply has a power failure, coil 7-1 loses voltage, normally opened contact 7-4,7-5 disconnects, voltmeter is zero, instantaneous power failure, two normally-closed contact 7-2 simultaneously, the 7-3 closure, coil 6-1 obtains voltage, two normally opened contact 6-4, the 6-5 closure, voltmeter 3 indicates the magnitude of voltage that electrical network is sent into load, at this moment owing to two normally-closed contact 6-2 that are connected in the coil 7-1 loop, 6-3 disconnects, make coil 7-1 locking, even stand-by power supply send electricity also to add less than on the coil 7-1 two normally opened contact 7-4 again, 7-5 is not closed, and the electricity of stand-by power supply just adds less than on the loaded line.

The utility model under Generators situation far away, need not set up reciprocal circuit at switchgear house again, saves electric wire, and only needs a people on duty, needn't remove a deciliter double-throw knife switch to switchgear house again.With the break-make of A.C. contactor control power supply, eliminated the electric spark, safe and reliable of deciliter double-throw knife switch basically, be particularly suitable for the application that small-sized oil depot, gas station are sent out switchgear house.

Indicator light 1 is housed, voltmeter 3, power network line knife switch 2, stand-by power supply circuit knife switch 4 on the panel of the utility model control 5.A.C. contactor 6 is housed, A.C. contactor 7 in the control flow 5.Present embodiment is applicable to that the duplicate supply self interlocking of single-phase 220V alternating current circuit switches, and A.C. contactor 6,7 is selected 220V, 20A for use, and voltmeter 3 be 250V, and indicator light is 220V, 2,4, be with the knife switch that insures for 250V.

The utility model is applicable to that also the duplicate supply self interlocking of three-phase circuit switches, and circuit diagram is changed to three-phase circuit figure, and element replacement is 380V, and the current parameters of element is decided according to the watt level of load.

Claims

1, a kind of duplicate supply self interlocking switching device shifter of forming by indicator light, knife switch, voltmeter, A.C. contactor, the coil 6-1 that it is characterized in that A.C. contactor 6 connects knife switch 2 and normally opened contact 6-4, other end series connection normally-closed contact 7-2 and the 7-3 of coil 6-1, the other end of normally-closed contact 7-3 connects knife switch 2 and normally opened contact 6-5, the coil 7-1 of A.C. contactor 7 connects knife switch 4 and normally opened contact 7-4, other end series connection normally-closed contact 6-2 and the 6-3 of coil 7-1, the other end of normally-closed contact 6-3 connects knife switch 4 and normally opened contact 7-5.