CN2105762U

CN2105762U - Electric leakage protective unit

Info

Publication number: CN2105762U
Application number: CN 91208717
Authority: CN
Inventors: 马林格
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-28
Filing date: 1991-05-28
Publication date: 1992-05-27

Abstract

The utility model belongs to the technique of electric protective switches. An electric leakage protective unit is provided for overcoming the problems of complex structure, inconvenient maintenance and high cost existing in existing electric leakage protective switches. The utility model can be formed into a split type electric leakage protective switch by connecting with an automatic air switch, and comprises an electric leakage protective circuit, a testing device and an electromagnetic release. The appearance of the electric leakage protective unit is a plastic casing with a wire inlet end and a wire outlet end at both ends, and a wire inlet end piece has double purposes of circuit connection and fixation; the push rod of the electromagnetic release is deepened into the connected air switch, so that the releasing rod of the air switch can be pushed while acting. The utility model has the advantages of convenient operation, easy fabrication and low cost.

Description

Electric leakage protective unit

The utility model belongs to electric switch and the protective device of H01H, and it relates to a kind of novel earth leakage circuit-breaker.

At present; the existing multiple product of the earth leakage circuit-breaker that China produces; as the DZ15L series of Shanghai production and the DZL25 series of Wenzhou production; they all are the approved products of GB6829-86 of being up to state standards; but its structure more complicated; need multiple specialized apparatus in the manufacturing, midget plant is difficult to produce.In addition, this series products is all not ideal enough on use maintenance and price.A large amount of at present automatic air-break switches that use all do not have creepage protection function in the low-voltage power supply system at home, but for security needs and anticreep accident that causes and fire, it is necessary that earth leakage protective is set under most occasions, generally there are two kinds: 1. replace existing air switch with aforesaid finished product earth leakage circuit-breaker, this needs very big spending, and the improper use meeting causes waste to a certain degree; 2. with the air switch combination of leakage relay with the band shunt release, doing like this needs to give old air switch to install shunt release additional, its wiring complexity, and cost is not low yet.So aforementioned two kinds of schemes are difficult to accomplish to the general user.

The purpose of this utility model is to provide a kind of novel structural design, gives automatic air-break switch continued access one residual current protective unit, makes this switch have reliable creepage protection function, and it is easy to maintenance to be easy to produce is a kind of economically viable scheme.

According to as above design; the residual current protective unit that this programme provided; adopted the structure of unitization; automatic air-break switch continued access assembly unit with corresponding specification; its concrete feature is: its appearance is a plastic casing; the wiring end sheet that the turnover line is arranged at the two ends of housing; there is the leakage inductance protected circuit inside and by the magnetictrip of this drives; action matches with the release lever of air switch in the inside that the dual-use function that its inlet wire dististyle has that circuit connects and uses as mechanical fixation during assembly unit, its termination that is subjected to the magnetictrip push rod that the leakage inductance protected circuit controlled are deep into the automatic air-break switch of institute's continued access.

The leakage inductance protected circuit of this programme residual current protective unit adopts general circuit by conducting system; detection of electrical leakage; signal processing and amplification; experimental rig and magnetictrip are formed; detection of electrical leakage is to be overlapped the conductor of conducting system by the instrument transformer that high magnetic conduction soft magnetic material is made iron core; the magnetic potential that does not exist leaky then to pass each circuit of instrument transformer offsets at ordinary times; no signal output on the instrument transformer winding; leakage current appears on certain phase line; the magnetic potential of each line can not be offset; produce induced potential; export through the signal processing and amplifying; the work of driving magnetictrip; the push rod of release promotes the release lever of automatic air-break switch, main switch is cut off the electricity supply rapidly finish the process of protection.

The inside of general earth leakage circuit-breaker all partly is made up of main switch and earth leakage protective; this two-part structure, principle and working method are entirely different; their life-span and fault rules separately also have very big difference; yet; break down or damage and all can cause whole switch out of service in any position in service; even scrap, cause very big waste.Therefore easily the residual current protective unit that this programme provided is simple in structure, and no complicated mechanical part is made, and makes up by the easy and standardized air switch of the structure of unitization, makes air switch increase creepage protection function with the means of less expensive.

Adopt this programme and can embody following superiority: the 1. easy and standardized automatic air-break switch combination of the residual current protective unit of unitization as required, and can derive multiple use, can produce as have the split mounting type electric equipment products of defencive functions such as phase shortage, overcurrent, under-voltage, overvoltage; 2. the simple structure of residual current protective unit, production cost are low, and little factory is acceptant, and the means of available less expensive increase the creepage protection function of automatic air-break switch; 3. two kinds of purposes of connection of its inlet wire dististyle double as circuit and mechanical fixation are easy to install and use; 4. this residual current protective unit wide accommodation, can make two lines, three-way, also can make four lines, five lines.

Fig. 1 is this programme residual current protective unit and the situation that the connects schematic diagram of automatic air-break switch continued access adapted.

Fig. 2 is the schematic diagram of residual current protective unit internal structure

What embodiment: Fig. 1, Fig. 2 showed is a specific embodiment, and it is the residual current protective unit of four lines and the earth leakage circuit-breaker that DZ10-250/330 type air switch is assembled into the 250A three-phase and four-line.Among the figure: (A)-residual current protective unit; (B)-air switch; (1)-base of residual current protective unit shell; (2)-terminals of the power supply neutral line; (3)-enclosure lid; (4)-the leading-out terminal guard shield of residual current protective unit; (5)-wiring end sheet of outlet; (6)-test button; (7)-release of residual current protective unit; (8)-the inlet wire dististyle; (9)-the release push rod; (10)-release lever of air switch; (12)-control circuit of impression protection; (11)-the installation screw.

Because this programme adopts the equipped mode of continued access, in the rectification of old low-voltage power supply system, only former air switch is upgraded and be earth leakage circuit-breaker with the expense of the 30-40% that purchases leakage switch, visible social benefit is significantly.The sample of this programme is reliable and stable through trial functions, moves working properly.

Claims

1, a kind of residual current protective unit of and automatic air-break switch continued access, it includes by the leakage inductance protected circuit of conducting system, detection of electrical leakage, signal processing and amplification, experimental rig, reaches magnetictrip, the appearance that it is characterized in that it is a plastic casing, there is the wiring end sheet of turnover line at the two ends of its housing, its inlet wire dististyle has higher-strength, and its position is corresponding with each leading-out terminal of automatic air-break switch; Be deep into by the automatic switch inside of continued access after the push rod of its magnetictrip that is subjected to the driving of leakage inductance protected circuit is installed, can promote the release lever of automatic air-break switch during action.