CN2457729Y

CN2457729Y - Single phase leakage braker

Info

Publication number: CN2457729Y
Application number: CN 00263352
Authority: CN
Inventors: 徐忠
Original assignee: WENZHOU WATER HEATER GENERAL FACTORY
Current assignee: WENZHOU WATER HEATER GENERAL FACTORY
Priority date: 2000-12-17
Filing date: 2000-12-17
Publication date: 2001-10-31
Anticipated expiration: 2010-12-17

Abstract

The utility model relates to a single phase electric leakage breaker, particularly an electric leakage breaker which is suitable for the electric leakage protection of I type domestic electric appliances. The utility model is provided with a shell body, an operating mechanism, an in-out wire connecting terminal, an electric leakage signal detection member, a wave filtering slicer circuit, a tripping mechanism, a moving contact, and a static contact. The utility model is characterized in that the utility model is also provided with a passage, an electric leakage signal detection member of the passage, and a wave filtering slicer circuit; the passage is formed by the connection in series of the in-out wire connecting terminal, the moving and the static contacts; the electric leakage signal detection member is used for detecting the passage; the in-out wire connecting terminal of the passage is respectively connected with a protective earth wire and a casing of an electric appliance. When a power cord is wrong connected or is connected in parallel with a protective earth wire to bring about the electric shock, after detected and magnified, the electric leakage signal of the passage controls the tripping mechanism to cut off power supply. The utility model overcomes the defect that the existing single phase electric leakage breaker does not prevent the electric shock which is resulted by the power cord is wrong connected or is connected in parallel with a protective earth wire.

Description

Single-phase residual current circuit breaker

The utility model relates to a kind of single-phase residual current circuit breaker, in particular for the earth leakage protective residual current circuit breaker of I class family expenses in electrical equipment.

Resemble many I class household electrical appliance such as split-type air conditioner, electric heater; according to national Specification; all on its metal shell or metal inner tube, be provided with the protective earthing line; correspondingly three-way form is also adopted in its supply socket; but present quality reason owing to user or installation personnel; with the three-way wrong of supply socket; even will protect ground wire and phase line or zero line and the phenomenon that connects also occurs now and then; touch the electrical appliance metal parts if any the people and just may get an electric shock this moment, and the existing single-phase residual current circuit breaker of TW two wire can not play detection and protective effect to above-mentioned situation.

The purpose of this utility model is to provide a kind of residual current circuit breaker that electric shock that existing single-phase residual current circuit breaker defencive function causes again can be to the three-way wrong of I class household electrical appliance supply socket the time detects and protects that promptly has for the defective that overcomes above-mentioned prior art.

The purpose of this utility model can reach by following scheme: single-phase residual current circuit breaker also is provided with a path that is composed in series by turnover line binding post and dynamic and static contact; and be provided with the electric leakage signal of electric leakage signal detection part and filtering amplitude limiter circuit detection path; the output of filtering amplitude limiter circuit is connected with tripping mechanism; moving contact and the interlock of all the other moving contacts, path turnover line binding post is connected with protection ground wire and electrical appliance shell respectively.

Owing to adopt such scheme, when the three-way misconnection of electrical appliance, particularly will protect ground wire and live wire or zero line and when connecing, when in a single day human body touches the electric appliance metal parts, just constitute the galvanic circle with the earth, just there is electric current to flow through on the protection ground wire, protects the electric leakage signal detection part on the ground wire action of detected signal amplification control tripping mechanism will be driven switch with three-way cut-out simultaneously at this moment, thereby play a protective role; When the supply socket wiring is correct; no matter whether protective earthing line ground connection is good; will not produce electric current on the protection ground wire; and another electric leakage signal detection part can leak electricity to power line the time human electric shock detect and protect, so the utility model has reached and has promptly had the purpose that existing single-phase residual current circuit breaker defencive function can be protected the electric shock that the three-way misconnection of I class household electrical appliance supply socket causes again.

Accompanying drawing 1 is the utility model embodiment theory diagram;

Accompanying drawing 2 is the utility model embodiment electrical schematic diagram;

Accompanying drawing 3 is the utility model example structure figure.

Further set forth the utility model and provide embodiment of the present utility model simultaneously below in conjunction with accompanying drawing.

In the present embodiment, still comprise housing, operating mechanism, tripping mechanism, be provided with three groups of turnover line terminals, three pairs of dynamic and static contacts and two groups of electric leakage signal detection part ZCT ₁, ZCT ₂And 3,4, three groups of inlet wire terminals of filtering amplitude limiter circuit are connected with protection ground wire E with power supply phase line L, zero line N respectively, and three groups go out terminals and are connected with electrical appliance 6 power lines and shell thereof respectively, and three groups of moving contacts are linkage structure, two groups of electric leakage signal detection part ZCT ₁, ZCT ₂Be made of annular core and coil, the path of power supply phase line L and zero line N passes ZCT simultaneously ₁The unbalanced power supply electric current is detected, and protection ground wire E is by passing ZCT ₂Protection ground wire E electric current is detected the coil of tripping relay J and bridge rectifier D ₁-D ₄Be connected across on the outlet terminals of phase line L and zero line N bridge rectifier electric current D after the series connection ₁-D ₄Be connected between the positive-negative output end by unidirectional controllable silicon S CR ₁, SCR ₂Bing Lian branch road in the same way, filtering amplitude limiter circuit 3,4 is by voltage stabilizing didoe Z, resistor R ₁And by capacitor C ₁, C ₂And resistor R ₂The π type filter circuit of forming is in parallel and constitute, and 3,4 outputs of filtering amplitude limiter circuit are connected with the one-way SCR trigger electrode, when the electric leakage signal detector is examined signal, and the single-phase silicon-controlled SCR of triggering behind the filtering amplitude limit ₁Or SCR ₂Make tripping relay J adhesive, and then 5 actions of control tripping mechanism drive K switch deenergization and earth connection.

Claims

1; a kind of single-phase residual current circuit breaker; has housing; operating mechanism; turnover line binding post; the electric leakage signal detection part; the filtering amplitude limiter circuit; tripping mechanism and moving; fixed contact; moving contact is a linkage structure; after electric leakage signal amplifies with the filtering amplitude limiter circuit after testing; the control tripping mechanism is threaded off and is cut off the electricity supply; it is characterized in that: described single-phase residual current circuit breaker also is provided with one by turnover line binding post and moving; fixed contact (7; 8) path that is composed in series (G); and be provided with the electric leakage signal of electric leakage signal detection part (2) and filtering amplitude limiter circuit (3) detection path (G); filtering amplitude limiter circuit (3) output is connected with tripping mechanism (5); moving contact (7) and all the other moving contact interlocks, path (G) turnover line binding post is connected with protection ground wire (E) and electrical appliance (6) shell respectively.

2, single-phase residual current circuit breaker according to claim 1 is characterized in that: described tripping mechanism (5) is by tripping relay (J), bridge rectifier (D ₁-D ₄) and single-phase silicon-controlled (SCR ₁, SCR ₂) constitute the coil of tripping relay (J) and bridge rectifier (D ₁-D ₄) be connected to by one-way SCR (SCR between the positive-negative output end ₁, SCR ₂) branch road in parallel in the same way, filtering amplitude limiter circuit (3,4) is by voltage stabilizing didoe (Z), resistor (R ₁) and by capacitor (C ₁, C ₂) and resistor (R ₂) the π type filter circuit formed is in parallel and constitute, filtering amplitude limiter circuit (3,4) output respectively with one-way SCR (SCR ₁, SCR ₂) trigger electrode connect.

3, single-phase residual current circuit breaker according to claim 1 and 2 is characterized in that: described electric leakage signal detection part (1,2) is by annular core and twine the zero-sequence transformer that the coil on it constitutes and constitute.