CN2116982U

CN2116982U - Multifunctional protector

Info

Publication number: CN2116982U
Application number: CN 92213566
Authority: CN
Inventors: 宗序新
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-02
Filing date: 1992-04-02
Publication date: 1992-09-23

Abstract

The utility model discloses a multifunctional protecting device comprising a low voltage power circuit and a conversion device connected with the low voltage power circuit. The frequent opening end or hem of the conversion device is connected with a group of multifunctional protecting circuits and the frequent closing end of the conversion device is connected with an electricity utilization line. The frequent opening end or hem of the conversion device is also connected with a controlling contact point causing the stopping device of a main circuit to work. The working coil of the conversion device is connected in series with the output end of the low voltage power circuit. Every multifunctional protecting circuit comprises an electricity leakage and shock protecting circuit, an over current protecting circuit, a minimum current controlling circuit and a three-phase unbalance and phase lacking protecting circuit. The multifunctional protecting device has the advantages of low no-load loss, high safety of electricity utilization, simple structure and reliable work.

Description

Multifunctional protector

The utility model relates to the generating of electric power; emergency protective circuit device in power transformation or the distribution technique; it is a kind of automatic disconnection emergency protective circuit device that the undesirable variation that departs from the normal electrical working condition is directly reacted; specifically; overcurrent and some other unusual electric situations are reacted; in other words, under voltage or no-voltage, the emergency protective circuit device that the phase failure during as heterogeneous the application reacts.

At present; known electric protective device; mainly form by current transformer and leakage tripping device etc.; it can be when electric leakage, electric shock accidents take place, with main circuit with use the electric line disjunction, electrical appliance and people are protected; but but can not distinguish circuit is zero load or load; can not be when zero load with main circuit with use the electric line disjunction, thereby form no-load loss, can not eliminate accident before generation.

The purpose of this utility model provide a kind of can be when not electricity consumption with main circuit with use the electric line disjunction, reduce no-load loss, the multi-function protector of raising electrical safety.

Technical solution of the present utility model is: a kind of multi-function protector comprises a low-voltage power circuit; Chang Kaiduan or Bian Yuyi group multifunctional protection circuit link to each other; normal-closed end or limit are connected with low-voltage power circuit with the switching device that links to each other with electric line; the Chang Kaiduan of switching device or limit also are connected to the control contact that makes the work of main circuit break-make device, and the actuating coil of switching device is connected with the low-voltage power circuit output.

Multifunctional protection circuit in the utility model comprises leak shock protective circuit, current foldback circuit, minimum current control circuit.

Multifunction protection electrical equipment in the utility model when main circuit is three-phase electricity, also comprises three-phase imbalance and open-phase protection circuit.

Each protective circuit in the utility model is switched through parallel operation spare by forming with the corresponding release that is connected with the current transformer of main circuit coupling connection after the contact series connection of each release.

Low-voltage power circuit in the utility model is a transformer, its output safety voltage.

Switching device in the utility model, comprise a sucking coil that is connected with the low-voltage power circuit output, one is subjected to an end that has conductor insulator connecting rod in flakes of sucking coil effect that extension spring is housed, the other end is provided with connecting terminal, and having between conductor insulator connecting rod two ends in flakes has a fulcrum.Certainly, switching device also can adopt other version, as adopting relay etc.

Be connected to hookup in switching device in the utility model and the circuit that is connected with electric line.Hookup is made up of test resistance and test switch.Certainly, hookup also can not adopt or adopt other version.

The utility model has the advantages that: the circuit structure form is simple; cost is low; reliable operation, easy to use when not electricity consumption of electrical appliance; can make main circuit automatically and use the electric line disjunction; and when the electrical appliance electricity consumption; can connect automatically again, and can use electric line only to be loaded with safe voltage, keep the low-voltage variation state with electric line.Reduce no-load loss, help improving electrical safety, more effectively avoid generation with electrification.Defencive function is many, and performance is good, and applicability is strong, applied range.Also can reequip original all kinds of leakage current protectors.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is a kind of multi-function protector circuit theory diagrams of the present utility model.

Fig. 2 is used for the multi-function protector circuit theory diagrams of three-phase circuit for another kind of the present utility model.

Fig. 3 is a kind of change-over switch arrangement schematic diagram of the present utility model.

Fig. 1 has described an embodiment of the present utility model.The power transformer B of an output safety voltage (as 12V) is connected on (after the kilowatt-hour meter) on the main circuit, and the secondary end of power transformer B connects the contact 3,7 of changing K switch through a sucking coil D1, and the secondary other end connects the conversion K switch _oContact 5,9, change over switch K _oContact 1,2 connect a line of main circuit break-make device C and main electrical equipment respectively, two switch contact C1-1, the C1-2 of main circuit break-make device C are connected in the main circuit, on main circuit (after the switch contact of break-make device C), coupling is joining leak shock current transformer Q1, overload detection current transformer Q2 respectively, minimum current detects current transformer Q3, current transformer Q1, Q2, Q3 connect with corresponding release D2, D3, D4 respectively, 11,12,13,14,15, the 16 series connection backs and change over switch K, contact of release D2, D3, D4 ₀Contact 4,6 link to each other change over switch K ₀8,10 of contacts with link to each other with electric line, at change over switch K ₀Contact 8,10 and be provided with the test electrical verification road of forming by button T, resistance R 2, variable resistor R1 with the line between electric line, whether its effect is normal for checking circuit work.

When the electricity consumption K switch disconnected, no current passed through in the main circuit, thereby made change over switch K ₀Sucking coil D1 lose its reliss change over switch K because of transformer B time level no current ₀Under spring action; break contact 3 and 4 and 5 and 6; and contact 1 and 2; break-make device C dead electricity is cut off main circuit, simultaneously; protective circuit part (being the contact 11,12,13,14,15,16 of release) disconnects with transformer secondary output; and contact 7 and 8,9 and 10 is connected, thereby makes B level of transformer and be connected with electric line, uses electric line to be in the low-voltage variation state.When the electricity consumption K switch was closed, B level of electrical appliance S and transformer formed loop, change over switch K ₀Sucking coil D1 in have electric current to pass through to produce attraction, the active force that this attraction produces has overcome spring resistance, makes change over switch K ₀Break contact 7 and 8,9 and 10, and connect 1 and 2,3 and 4,5 and 6, main circuit promptly is switched on, normal power supply, and protective circuit also is connected with B level of transformer simultaneously.In case when leak shock is arranged, leak contact current instrument transformer Q1 and produce induced current, the effect by coupled leak shock protection release D2 makes protection contact 11,12 disjunctions, and B level of transformer becomes to open circuit change over switch K ₀Sucking coil D1 no current by losing its reliss, thereby cut off main circuit (being break contact 1 and 2), reach the protection purpose.Equally, when overload taking place, produce induced current among the overload current instrument transformer Q2, make protection contact 13,14 disjunctions, reach the protection purpose of cutting off main circuit too by overload protection release D3 with electric line.Minimizing along with power consumption; diminish with electric current in the electric line; when electric current is reduced to a certain degree; minimum current Control current instrument transformer Q3 is by the effect of the release D4 that is attached thereto; the effect that produces can not be kept contact 15,16 closures; also can cut off main circuit, and, reach the protection purpose for providing low-voltage variation with electric line.When load being arranged with electric line, decompression, under-voltage appears, and secondary, the primary voltage of power transformer B all reduce, change over switch K ₀Sucking coil D1 reaction force attenuation, by spring action, make contact 1 and 2,3 and 4,5 and 6 disjunctions, cut off main circuit; When occurring opening circuit with electric line, if load is arranged, minimum current control protection is had an effect, if non-loaded, the same when then disconnecting with the electricity consumption K switch, use electric line to keep unloaded low-voltage variation state.

Fig. 2 has described another embodiment of the present utility model.This embodiment describes is the situation of the utility model when being applied in the three-phase electricity circuit, among this embodiment except have with previous embodiment in the same break-make device C, power transformer B, change over switch K ₀, sucking coil D1, change over switch K ₀Contact 1; 2; 3; 4; 5; 6; 7; 8; 9; 10; current transformer Q1; Q2; Q3; release D2; D3; D4; release contact 11; 12; 13; 14; 15; 16; the electricity consumption K switch; test button T; test resistance R1; outside the R2; increased the current transformer Q4 of one group of three same specification in addition; Q5; Q6; and the release D5 that is attached thereto, the protection contact 17 of release D5; 18 also connect with the protection contact of other release, to play the three-phase imbalance protective effect; as situations such as phase shortages; when load is arranged, if three-phase does not weigh current transformer Q4; Q5; the induced current vector that produces among the Q6 and; release D5 is had an effect; contact 17; 18 disjunctions, thus main circuit is cut off, play a protective role.Protection three-phase electrical appliance such as three phase electric machine 3D etc.

Fig. 3 has described a kind of change over switch that is adopted in the utility model.There is one to have conductor insulator connecting rod 33 in flakes in this switch, the one end is connected with an extension spring 31, the other end is in

contact

1,2,3,4,5,6 with

contact

7,8,9, between 10, the parts 32 as fulcrum are equipped with in connecting rod 33 inboards near dress extension spring 31 places, connecting rod 33 inboards between supporting point part 32 and contact are provided with sucking coil D1, when attracting line chart D1 to have electric current to pass through, produce attraction, with connecting rod 33 inside laybacks, make

contact

1 and 2,3 and 4,5 and 6 connect, and sucking coil D1 no current by the time, then conductor connecting rod 33 makes contact 7 and 8 under the effect of

extension spring

31,9 and 10 connect.

Claims

1, a kind of multi-function protector; it is characterized in that: comprise a low-voltage power circuit; Chang Kaiduan or Bian Yuyi group multifunctional protection circuit link to each other; normal-closed end or limit are connected with low-voltage power circuit with the switching device that links to each other with electric wire; the Chang Kaiduan of switching device or limit also are connected to the control contact that makes the work of main circuit break-make device, and the actuating coil of switching device is connected with the low-voltage power circuit output.

2, multi-function protector according to claim 1 is characterized in that: multifunctional protection circuit comprises leak shock protective circuit, overload protecting circuit, minimum current control circuit.

3, multi-function protector according to claim 2 is characterized in that: when main circuit was three-phase electricity, multifunctional protection circuit also comprised three-phase imbalance and open-phase protection circuit.

4, according to claim 2 or 3 described multi-function protectors, it is characterized in that: each protective circuit is switched through parallel operation spare by forming with the corresponding release that is connected with the current transformer of main circuit coupling connection after the contact series connection of each release.

5, according to claim 1 or 2,3 described multi-function protectors, it is characterized in that: low-voltage power circuit is a transformer, its output safety voltage.

6, multi-function protector according to claim 4 is characterized in that: low-voltage power circuit is a transformer, its output safety voltage.

7, according to claim 1 or 2,3 described multi-function protectors; it is characterized in that: switching device comprises a sucking coil that is connected with the low-voltage power circuit output; one is subjected to an end that has conductor insulator connecting rod in flakes of sucking coil effect that extension spring is housed; the other end is provided with connecting terminal, and having between conductor insulator connecting rod two ends in flakes has a fulcrum.

8, according to claim 1 or 2,3 described multi-function protectors, it is characterized in that: in switching device and the circuit that is connected with electric line, be connected to hookup.

9, multi-function protector according to claim 8 is characterized in that: hookup is made up of test resistance and test switch.