CN86206071U - Automatically protective switch for electric-leakage - Google Patents
Automatically protective switch for electric-leakage Download PDFInfo
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- CN86206071U CN86206071U CN 86206071 CN86206071U CN86206071U CN 86206071 U CN86206071 U CN 86206071U CN 86206071 CN86206071 CN 86206071 CN 86206071 U CN86206071 U CN 86206071U CN 86206071 U CN86206071 U CN 86206071U
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- circuit
- electric
- leakage
- electric leakage
- leakage safety
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Abstract
The utility model discloses an automatically protective switch for electric-leakage, comprising a detection circuit, a control circuit, an indication circuit and a rectification circuit. When the housing of an electric appliance generates a current leakage, the detection circuit detects a positive pulse signal and sends out the positive pulse to the trigger electrode of controlled silicon to make the controlled silicon conducted so as to make a relay act to cut off the power supply. The utility model doesn't need the human body to contact the electric appliance which leaks, and can cut off the power supply within 0.01 seconds when the housing of the electric appliance is charged. The automatically protective switch for electric-leakage has the advantages of high sensitivity, safety and low price, and besides, the automatically protective switch for electric-leakage is suitable for the industries of industry, agriculture, domestic electric appliance, etc.
Description
The utility model relates to a kind of automatic electric leakage safety cout off, belongs to the safety utilization of electric power protective device.
The electric leakage safety cout off of selling in the market and using, mostly be that a pulse voltage that produces when utilizing the two-phase unsymmetrical current to flow through instrument transformer is removed control circuit, make the relay working face cut off electric current, but the electrical equipment that all will work as human body contact electric leakage, electric current just moves after flowing through human body, to human body, particularly heart works the mischief easily like this.
The purpose of this utility model just provides a kind of human body contact electric leakage electrical equipment, the automatic electric leakage safety cout off that can cut off the electricity supply automatically of not needing in the charged centisecond of electric appliance casing.
Below with reference to accompanying drawing the utility model is described in detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the utility model replaces one-way SCR with bidirectional triode thyristor control circuit figure.
Fig. 3 is a step-less adjustment circuit diagram of the present utility model.
Fig. 4 is that the utility model utilizes instrument transformer to detect the circuit diagram of electric leakage signal.
This leakage switch basic circuit comprises testing circuit, control circuit, indicating circuit, rectification circuit, and testing circuit is by resistance R
2Form; Control circuit is made up of controllable silicon CT, relay J; The electric leakage indicating circuit is by resistance R
1, light-emitting diode (band color) D
2Form, safe indicating circuit is by capacitor C
3, resistance R
3, light-emitting diode (being with another color) D
3Form; Rectification circuit is by decompression capacitor C
1, filter capacitor C
2, voltage stabilizing didoe D
W, rectifier diode D
1Form.Among Fig. 1, A point phase-connecting wire, B point connecting to neutral line, C point circuit closer shell, R
WBe electrical appliance.
As electrical appliance R
WOuter casing electrification or when electric leakage, testing circuit detects a positive pulse signal by contact C, through resistance R
2Deliver to the trigger electrode of controllable silicon CT, trigger the controllable silicon conducting, executive component relay J action at this moment, normally closed joint disconnects, and cuts off the power supply of electrical equipment.This moment the indicating circuit energized of leaking electricity, light-emitting diode D
2Luminous (color is arranged), represent that this electrical equipment has leaky, after fault is got rid of, press the push button K that resets, at this moment controllable silicon CT trigger electrode has added a negative voltage, controllable silicon is turn-offed, the relay decompression discharges, and normally closed joint is connected, and electrical equipment gets final product operate as normal, this moment, safe indicating circuit energized made light-emitting diode D
3(being with another color) is luminous, and expression electrical equipment does not have leaky.
Fig. 2 of the present utility model for controllable silicon except that preferentially selecting for use the one-way SCR, also available bidirectional triode thyristor replaces, but also must seal in a diode D in testing circuit
4Fig. 3 is a step-less adjustment circuit, as control the break-make of the The Trigger of Bidirectional Triode Thyristor utmost point with a normally closed joint of relay, just can form a multi-functional leakage switch.This leakage switch can be used as an independent safety socket, is installed in the common tetrad socket, also can directly be contained in electrical equipment inside, or be designed to various forms.
This electric leakage safety cout off does not need the electrical equipment of human body contact electric leakage, can cut off the electricity supply automatically in the charged centisecond of electric appliance casing.When being connected to, electric appliance casing is failure to actuate when the zero line of protecting ground wire or electrical equipment is run into shell; faint induced electricity (as the weak induced electricity of electric fan) can not move yet; have only when live wire is run into electric appliance casing or outer casing electrification and just can move, the height of operation voltage is by detecting resistance R
2Resistance decision, adjust R
2Resistance just can adjust the height of operation voltage.
As will be with this leakage switch during as total electric leakage safety cout off (be installed in electric supply meter then insert again indoor), as long as between controllable silicon trigger electrode and zero line, insert a current transformer, see Fig. 4, so no matter to be that electric appliance casing is charged, or human body is run into the electric wire that leaky is arranged accidentally.Or during the lamp holder live wire, all can cut off the electricity supply automatically.D point connecting to neutral line among Fig. 4, E point phase-connecting wire (live wire), B ', A ' are received B point and the A point of Fig. 1 respectively.
This leakage switch applied range, civilianly all can use worker, agricultural, can be used as movable electrical appliances (such as electric fan, electric drill, building trade electric electromagnetic shaker commonly used etc.), the fixing earth leakage protective device of electrical equipment (such as lathe, centrifuge, pump etc.). This gfci circuit is simple, and cost is low. About about 6～7 yuan, easy to use, highly sensitive, safe and reliable.
Claims (6)
1, a kind of automatic electric leakage safety cout off is characterized in that: be made up of testing circuit, control circuit, indicating circuit and rectification circuit.As electrical appliance R
WOuter casing electrification the time, do not need human body contact, testing circuit is just measured a pulse signal by contact C, removes to trigger controllable silicon CT and makes its conducting, thereby promote the action of executive component relay J, cuts off the electricity supply.
2, automatic electric leakage safety cout off according to claim 1 is characterized in that testing circuit is by resistance R
2, diode D
4Form.
3, automatic electric leakage safety cout off according to claim 1 is characterized in that control circuit is made up of controllable silicon CT, relay J.
4, automatic electric leakage safety cout off according to claim 1, the indicating circuit that it is characterized in that leaking electricity is by resistance R
1, light-emitting diode D
2Form.Safe indicating circuit is by capacitor C
3, resistance R
3, light-emitting diode D
3Form.
5, automatic electric leakage safety cout off according to claim 1 is characterized in that rectification circuit is by capacitor C
1, C
2, diode D
W, D
1Form.
6, automatic electric leakage safety cout off according to claim 1 when it is characterized in that as total electric leakage safety cout off, inserts a current transformer between controllable silicon CT and zero line D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86206071 CN86206071U (en) | 1986-08-15 | 1986-08-15 | Automatically protective switch for electric-leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86206071 CN86206071U (en) | 1986-08-15 | 1986-08-15 | Automatically protective switch for electric-leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86206071U true CN86206071U (en) | 1987-09-12 |
Family
ID=4808793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86206071 Withdrawn CN86206071U (en) | 1986-08-15 | 1986-08-15 | Automatically protective switch for electric-leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86206071U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105396703A (en) * | 2015-11-30 | 2016-03-16 | 惠州学院 | Variable-frequency centrifuge control system |
| CN106607974A (en) * | 2017-01-21 | 2017-05-03 | 向奕铭 | Safety protection device for electric circular saw and method thereof |
-
1986
- 1986-08-15 CN CN 86206071 patent/CN86206071U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105396703A (en) * | 2015-11-30 | 2016-03-16 | 惠州学院 | Variable-frequency centrifuge control system |
| CN106607974A (en) * | 2017-01-21 | 2017-05-03 | 向奕铭 | Safety protection device for electric circular saw and method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |