CN2162729Y

CN2162729Y - Null line breaking protection device for three-phase four-way power supply system

Info

Publication number: CN2162729Y
Application number: CN 93219619
Authority: CN
Inventors: 刘杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-25
Filing date: 1993-07-25
Publication date: 1994-04-20
Anticipated expiration: 2003-07-25

Abstract

The utility model relates to a civil protection device for a power supply system, comprising a housing, a front panel, a rear panel, an operating button, a wiring terminal, and a circuit part. The circuit part comprises a fuse, a main contactor 1 CJ, a middle contactor 2CJ and switches QA, TA. When the zero line breaks off or the live wire breaks off, the tripping operation occurs to the winding of the 2CJ because of the electricity loss, and the main contact of the 2CJ is switched off. The main contact of the 1CJ is switched off because of the electricity loss of the 1CJ, so that the loads on the whole circuit are protected.

Description

Null line breaking protection device for three-phase four-way power supply system

The utility model relates to a kind of folk power supply system protective device.

What existing three-phase four-wire system illuminating line generally adopted is that air automatic switch, plug-in strip and fuse blade switch are as electric protective device.Automatic air-break switch only plays overload, overcurrent and overvoltage protection, and plug-in strip and fuse blade switch only play short-circuit protection.(zero-line section is 1/2 of a phase line when neutral line break takes place in supply line, intensity is low), the low voltage electric network neutral point becomes earth-free operation, and the distribution of voltage will be different with the size of load, each phase load varies, exveral phenomena about voltage imbalance often exists, and under the situation of neutral line break, (refrigerator, television set, illumination all are in the star running status in all loads, cause a phase voltage low excessively, one phase voltage is too high, when surpassing given load, will cause electrical equipment to burn.In addition, will produce bigger electric current behind the neutral line break, when people and animals' process broken string pick-up point, the step voltage of generation causes danger to people and animals.Up to the present, also the protective device of not finding at the neutral line break employing.

The purpose of this utility model provides and a kind ofly is prone to this phenomenon of accident and the neutral line break protective device that designs at neutral line break.

The utility model comprises housing, front panel, rear board, action button, binding post and circuit part.Circuit part comprises fuse, main contactor 1CJ, secondary circuit control indirect tentaculum 2CJ and console switch QA, TA.Fuse is to shield when short circuit and overload, and main contactor 1CJ has the function of connecting circuit and disengagement failure.The utility model can be installed in after point of incoming cables or the kilowatt-hour meter.Under normal operation, press starting button QA, middle contactor coil 2CJ connects, adhesive armature, the main contact of connection 2CJ, main contactor 1CJ coil is charged, connects the 1CJ main contact.Press stop button TA, disconnect the 2CJ loop, the 2CJ coil disconnects and makes the 1CJ coil losing electricity, and the 1CJ main contact disconnects.

Advantage of the present utility model is: when disconnected or live wire was disconnected when zero line, the 2CJ coil tripped because of dead electricity, and the main contact of 2CJ disconnects, and the 1CJ dead electricity disconnects its main contact, thereby the load on the whole circuit is protected.

Embodiment of the present utility model is illustrated in conjunction with the accompanying drawings.

Fig. 1 is front panel of the present utility model, housing schematic diagram.

Fig. 2 is a rear board schematic diagram of the present utility model.

Fig. 3 is a circuit diagram of the present utility model.

Fig. 4 is a circuit installation diagram of the present utility model.

As shown in Figure 1 and Figure 2, the utility model comprise housing (1), front panel (2),, rear board (6), action button (3), (4) and binding post (7), (5) are hold-down screw, (8) are for the hole occurring.Circuit board is housed in the housing.

As shown in Figure 3, Figure 4, circuit part comprises fuse 1RD, 2RD, main contactor 1CJ, indirect tentaculum 2CJ.X11-X31, X12-X32, X13-X33, X4-X14 are the contact of 1CJ among the figure, and X21-X41, X22-X42 are the contact of 2CJ.The circuit loop trend is B → QA → 2CJ coil → shutdown switch TA → zero line N → 2CJ contact → 1CJ coil → 1CJ contact.

Claims

1, a kind of three phase and four wire circuit system neutral line break protective device; it is characterized in that this device comprises housing (1), front panel (2), rear board (6), action button (3), (4), binding post (7) and circuit part, but be connected to the main contactor 1CJ of fuse disengagement failure in the circuit and be used to control the contactor 2CJ of secondary circuit.