CN201298751Y

CN201298751Y - Modified electricity no-voltage backup power switchover unit used in transformer station

Info

Publication number: CN201298751Y
Application number: CNU2008202167165U
Authority: CN
Inventors: 杨彪; 丁嵬
Original assignee: HONGZE POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co
Current assignee: HONGZE POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co
Priority date: 2008-11-13
Filing date: 2008-11-13
Publication date: 2009-08-26
Anticipated expiration: 2018-11-13

Abstract

The utility model discloses a modified electricity no-voltage backup power switchover unit used in transformer station. The electricity control circuit comprises a switchover loop; three-phase piezoelectric relays (1, 2) are respectively connected to the lower lead-in wires of the change-over switches (5, 6) of the incoming line I and the incoming line II; a pair of normally close contacts of the two three-phase piezoelectric relays (1, 2) are connected in series, and connected between the auxiliary contacts of the change-over switches (5, 6) and the AC contactor (3, 4). When single-phase grounding, single-phase failure or more than two phase failure happens in the incoming line II system, the 1YJ judges out the system failure phase, the normally close contact 1YJ1 closes; because the 2YJ piezoelectric relay does not work, the normally close contact 2YJ1 closes; the incoming line 1 backup power switchover circuit connects, the incoming line 1 AC contactor starts, and the incoming line 1 switches over successfully; and the switchover principle of the incoming line II is same as that of the incoming line I. The circuit in the utility model achieves the advantages of simple design, less investment, rapid effectiveness, high safety factor, low labor intensity and short construction time.

Description

Institute of modified model electric substation electricity consumption decompression is equipped with throws

Technical field

The utility model relates to institute of modified model electric substation electricity consumption decompression and is equipped with throwing.

Background technology

Create first-class enterprise, strong electrical network must be arranged as hardware support, strong electrical network must accomplish that equipment is superior, technological precedence, thus guarantee power grid security, economical operation is served high-quality and efficient.As everyone knows, the purposes of AC power supply system in electric substation is a lot, the accumulation power supply of switch, electronic disconnecting link, dc charging device power supply, service work power supply, life is illuminating all is alternating currents, and alternating current is indispensable at the day-to-day operation of electric substation with regard to its importance.We have lacked the phase shortage automatic switching function in institute's electricity consumption modular design at present, the old-fashioned used electric screen that the merchant of all manufacturing factories produces does not consider that all phase shortage is equipped with throwing, all there is the possibility of phase-deficient operation in old-fashioned used electric screen in running, need manually but to change, and the distant control function that disappeared, this makes troubles for the operation of unwatched electric substation, also is a potential safety hazard, has seriously influenced power supply reliability and corporate image.

Existing electric substation power utilization system automatic switching function is to throw the loop fully by closed connection of the 380V A.C. contactor normally closed contact dead electricity of two-way inlet wire, A.C. contactor actuating coil working power is to be connected between any two phase voltages (380V), normal used TURP changes that operation cuts off be become low-pressure side inlet wire knife switch, at this moment the A.C. contactor three-phase loses voltage simultaneously, the A.C. contactor actuating coil is to be connected on the voltage of all can losing the job between which two-phase, and normally closed contact starts throws the loop fully.And work as high-voltage wire iron-melting fusing or come off or system single-phase earth fault mutually just in time is not connect that of working power, at this moment to throw the loop fully can not start, the equipment of so full institute will move or phase-deficient operation by tape jam mutually, and the equipment that all influences is healthy to be moved.

Summary of the invention

The purpose of this utility model is: the throwing fully of a kind of modified model electric substation's institute's electricity consumption decompression is provided, increase phase shortage and throw automatic switching function fully, realize that small current neutral grounding system also can switch to back-up circuit with full institute AC system when single-phase fault takes place, avoid the phase-deficient operation of AC system, guarantee the AC system electricity consumption of full institute, improve the fail safe of institute's electricity consumption AC system.

Technical solution of the present utility model is: comprise in the used electric control loop of electric substation and throw the loop fully, it is characterized in that: the following lead-in wire place at the change over switch of inlet wire I and inlet wire II is connected the three-phase voltage relay respectively, is connected between change over switch auxiliary contact and the A.C. contactor after a pair of normally closed contact serial connection of two three-phase voltage relays.

When the above failure system phase shortage of inlet wire II system generation single-phase earthing or single-phase fault and two-phase, 1YJ judges system's phase shortage, its normally closed contact 1YJ1 closure, because the 2YJ voltage relay does not drop into, normally closed contact 2YJ1 closure, incoming power I throws the loop fully and connects, and starts inlet wire I A.C. contactor, and inlet wire I throws successfully fully; Inlet wire II throws principle fully with inlet wire I.

The utility model loop simplicity of design, small investment, instant effect, safety system height, labour intensity is low, and the engineering time is short.

Description of drawings

Fig. 1 throws the loop schematic diagram fully for the utility model 1#.

Fig. 2 throws the loop schematic diagram fully for the utility model 2#.

Among the figure: 1,2 three-phase voltage relays.3,4 A.C. contactors, 5,6 change over switches.

Embodiment

As shown in Figure 1, 2, in the used electric control loop of electric substation, comprise and throw the loop fully, it is characterized in that: be connected between change over

switch

5,6 auxiliary contacts and the A.C. contactor 3,4 be connected a pair of normally closed contact serial connection of 1,2, two three-phase voltage relays 1,2 of three-phase voltage relay respectively at the following lead-in wire place of the change over

switch

5,6 of inlet wire I and inlet wire II after.

When inlet wire II system generation single-phase earthing or single-phase fault and two-phase and above failure system phase shortage, 1YJ judges system's phase shortage, its normally closed contact 1YJ1 closure, because the 2YJ voltage relay does not drop into, normally closed contact 2YJ1 closure, incoming power I throws the loop fully and connects, and starts inlet wire I A.C. contactor, and inlet wire I throws successfully fully; Inlet wire II throws principle fully with inlet wire I.

Claims

1. institute of modified model electric substation electricity consumption decompression is equipped with throwing, comprise in electric substation and to throw the loop fully with electric control loop, it is characterized in that: the following lead-in wire place at the change over switch (5,6) of inlet wire I and inlet wire II is connected three-phase voltage relay (1,2) respectively, is connected between change over switch (5,6) auxiliary contact and the A.C. contactor (3,4) after a pair of normally closed contact serial connection of two three-phase voltage relays (1,2).