CN2086419U

CN2086419U - Anti-jointing switch with ground wire checking unit

Info

Publication number: CN2086419U
Application number: CN 91201372
Authority: CN
Inventors: 朱少武
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-24
Filing date: 1991-01-24
Publication date: 1991-10-09

Abstract

The utility model discloses a detector used for preventing the ground wire being switched on. A detecting branch circuit with a diode in a photoelectric coupler is connected in series between the input end of the power supply and a test clip; a receiving branch circuit with a triode in the photoelectric coupler is connected in series between the input end of the power supply and a ground wire; an execution circuit with a relay and an alarm circuit controlled by the relay are respectively connected between the input end of the power supply and the ground wire. When a circuit is detected, the ground connection and the short circuit to earth of three phases or any phase can be detected. After the circuit is repaired, the removal of the ground wire with three phases can be detected, and therefore, the ground wire can be effectively prevented from being switched on.

Description

Anti-jointing switch with ground wire checking unit

The utility model belongs to defeated supply line proving installation, and the defeated supply network of particularly a kind of high-low pressure prevents the switching on earth wire detecting device.

The defeated supply network of high-low pressure is when interruption maintenance, and in order to ensure personal safety, one group of ground wire all will be hung by all maintenance departments that needs, and in whole maintenance circuit, may hang with many group ground wires, and maintenance finishes, and the necessary complete removal of all ground wires just can send.If one group of ground wire is not removed and is sent electricity, the switching on earth wire accident will take place, thereby causes serious disastrous effect for defeated supply network and equipment, it is also pretty troublesome to find out the trouble spot in addition, and this influences on schedule again and send.

The purpose of this utility model provides a kind ofly can measure whether three-phase and wherein arbitrary phase ground connection good, three-phase and wherein arbitrary relatively whether short circuit, maintenance back and can measure the three-phase ground wire whether complete removal prevent the switching on earth wire detecting device.

The utility model is achieved in that it has a direct supply, the power input that links to each other with direct supply and three test clips, between power input and test clip, be serially connected with detection branch, between power input and ground wire, be serially connected with receiving branch, the warning circuit that also is connected to the executive circuit with relay respectively and controlled by relay between power input and ground wire, the output terminal of described receiving branch links to each other with the control end of executive circuit.During test, three test clips are connected on the secondary disconnecting link below of three-phase electricity respectively, when one group of ground wire is not removed, the detection branch conducting, and make the receiving branch conducting, make the relay adhesive of executive circuit, and then make the interrupted sounding alarm of warning circuit that is subjected to relay control.

Advantage of the present utility model is can detect whether three-phase and wherein arbitrary phase ground connection is good when line maintenance, three-phase and wherein arbitrary whether short circuit relatively, after maintenance, can detect whether complete removal of three-phase ground wire, thereby prevent switching on earth wire reliably, different sound and light alarms can be sent under these external different situations, power plant, high-low pressure transformer and distribution power station and the maintenance of open-air high-low pressure supply network can be widely used in.

Provide embodiment of the present utility model below in conjunction with accompanying drawing:

Fig. 1 is a circuit block diagram of the present utility model;

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

As Fig. 1, shown in Figure 2, the utility model has one by direct supply E, the power input 5 that links to each other with direct supply E and three test clip CS1～CS3, said direct supply E can be provided by 12V D.C. regulated power supply or electric battery, on power input 5, be serially connected with by current-limiting resistance R1, among the photoelectrical coupler T1 diode just-negative pole, reometer mA, potentiometer W1, one end links to each other with the other end of potentiometer W1, the detection branch 1 that the normally closed button AN1 of another termination test clip CS1～CS3～AN3 forms, at power input 5 and the ground wire 7(of system is power supply E negative pole) between be serially connected with respectively by the resistance R 2 that plays the dividing potential drop effect, the receiving branch 2 that the collection-emitter-base bandgap grading of the triode among the photoelectrical coupler T1 and resistance R 3 constitute, and penetrate-collect the executive circuit 3 that the utmost point constitutes by relay J and triode T2, the control end 6(of said executive circuit 3 is the base stage of triode T2) connect the collector of triode among the photoelectrical coupler T1, power input 5 and systematically line end 7 also be serially connected with the power indicating circuit that constitutes by resistance R 4 and pilot lamp XD respectively and by resistance R 4, the normally closed contact J2 of pilot lamp LD and relay J forms is not with the ground wire indicating circuit, at power input 5 with systematically be serially connected with respectively between the line end 7 by the resistance R 5 that plays the dividing potential drop effect, the controlling alarm branch road that the normally closed contact J2 of R6 and relay J constitutes, by hummer FM, the warning branch road that the emitter of triode T3～T4-collector constitutes, the base stage of described triode T3 links to each other with the node 8 of resistance R 5 and R6, the utility model also has another controlling alarm branch road, it is by the normally opened contact J1 between the base stage that is serially connected in power input 5 and triode T4, resistance R 7, pilot lamp HD and resistance R 8 and power end 9 connect power input 5 by normally opened contact J1, output terminal 10 link to each other with the node of resistance R 8 and pilot lamp HD by resistance R 9～R12, capacitor C 2～C3, the oscillator that triode T5～T6 forms constitutes, and described two controlling alarm branch roads and warning branch road constitute the warning circuit (4) that is subjected to relay J control.

When defeated supply network and equipment interruption maintenance thereof, at first discharge, electrical verification is afterwards be sure of not have electricity and is hung up properly ground wire afterwards.Then with this detector housing (being system's ground wire) ground connection, test clip CS1～CS3 is clipped in respectively by the A of maintenance circuit, B, C three-phase electricity secondary disconnecting link below, energized then, can detect, if three-phase line is reliable ground when having one group of ground wire not remove (or shorted to earth or) all, detection branch 1 conducting, and make receiving branch 2 conductings, make the control end 6 of executive circuit 3 be low level, then relay J adhesive, the controlling alarm branch road that comprises normally closed contact J2 disconnects, the controlling alarm branch road that comprises normally opened contact J1 is connected, and described oscillator is started working, and makes triode T4 be interrupted conducting and ends, and then make the interrupted sounding of hummer FM, the luminous indication of pilot lamp HD simultaneously; If ground wire grounded not good or ground wire complete removal, then detection branch 1 not conducting, and then receiving branch 2 not conductings, not adhesive of relay J comprises the controlling alarm branch road conducting of normally closed contact J2, makes triode T3 conducting, the continuous sounding of hummer FM, the luminous indication of pilot lamp LD simultaneously.

Claims

1, a kind of switching on earth wire detecting device that prevents comprises a direct supply (E), the power input (5) that links to each other with direct supply (E) and three test clip (CS ₁～CS ₃), it is characterized in that, at described power input (5) and test clip (CS ₁～CS ₃) between be serially connected with detection branch (1), at power input (5) with systematically be serially connected with receiving branch (2) between the line end (7), at power input (5) with systematically also be connected to executive circuit (3) between the line end (7) respectively and be subjected to the warning circuit (4) of relay (J) control with relay (J), the output terminal of described receiving branch (2) links to each other with the control end (6) of executive circuit (3)

1.1 described detection branch (1) is by the current-limiting resistance (R that is serially connected on the power input (5) ₁), photoelectrical coupler (T ₁) in diode just-negative pole, reometer (mA), potentiometer (W ₁) and an end and potentiometer (W ₁) the other end link to each other, the other end meets test clip (CS respectively ₁～CS ₃) normally closed button (AN ₁～AN ₃) form;

1.2 described receiving branch (2) is by being serially connected in power input (5) and the resistance (R that plays the dividing potential drop effect between the line end (7) systematically ₂), photoelectrical coupler (T ₁) in the collection-emitter-base bandgap grading and the resistance (R of triode ₃) form;

1.3 described executive circuit (3) is by being serially connected in power input (5) and relay (J) and the triode (T between the line end (7) systematically ₂) the utmost point of penetrating-collect form;

1.4 described warning circuit (4) is by being serially connected in power input (5) respectively and systematically playing the resistance (R of dividing potential drop effect between the line end (7) ₅, R ₆) and relay (J ₁) normally closed contact (J ₂) the controlling alarm branch road that constitutes, hummer (FM), triode (T ₃～T ₄) the warning branch road that constitutes of emitter-collector and be serially connected in power input (5) and triode (T ₄) base stage between normally opened contact (J ₁), resistance (R ₇), pilot lamp (HD) and resistance (R ₈) and power end (9) by normally opened contact (J ₁) meet power input (5), output terminal (10) and resistance (R ₈) link to each other with the node of pilot lamp (HD) by resistance (R ₉～R ₁₂), electric capacity (C ₂～C ₃), triode (T ₅～T ₆) another controlling alarm branch road of constituting of the oscillator formed forms described triode (T ₃) base stage and resistance (R ₅And R ₆) node (8) link to each other.

2, the switching on earth wire detecting device that prevents according to claim 1, it is characterized in that, at power input (5) with systematically also be serially connected with the power indicating circuit formed by resistance (R4) and pilot lamp (XD) between the line end (7) respectively and be not with the ground wire indicating circuit by what the normally closed contact (J2) of resistance (R4), pilot lamp (LD) and relay (J) was formed.