CN202034760U - Earth leakage and non-earth leakage protection circuit - Google Patents
Earth leakage and non-earth leakage protection circuit Download PDFInfo
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- CN202034760U CN202034760U CN2011200692930U CN201120069293U CN202034760U CN 202034760 U CN202034760 U CN 202034760U CN 2011200692930 U CN2011200692930 U CN 2011200692930U CN 201120069293 U CN201120069293 U CN 201120069293U CN 202034760 U CN202034760 U CN 202034760U
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- protection circuit
- leakage protection
- earth leakage
- earth
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Abstract
The utility model discloses an earth leakage and non-earth leakage protection circuit, comprising a common leakage protection circuit and a non-earth leakage detection circuit, wherein the non-earth leakage detection circuit includes two resistors R11 and R12, and two normally closed switches SW2 and SW3. The earth leakage and non-earth leakage protection circuit not only has the functions of a common leakage protector, but also additionally has the function of non-earth leakage protection. When a load has leakage danger, but a power supply and the load are not effectively earthed, the circuit of the utility model can cut off the connection of the power supply and the load, thus avoiding human body from electric shock. In addition, when the power supply of the leakage protector is not provided with an earth wire, and the earth terminal of the power supply and a live wire are short circuited, the circuit of the utility model can also cut off the connection of the power supply and the load. The technical scheme is simple, low in cost and stable in performance.
Description
Technical field
The utility model relates to the electric leakage protection technology field, relates in particular to a kind of Leaked Current of Line to Ground and non-earth leakage protection circuit.
Background technology
Existing leakage protection circuit is an earth leakage protection, and the necessary ground connection of load (electrical equipment) shell that it connects is good, just can avoid the human electric shock, otherwise, in case human body contact shell causes getting an electric shock easily.Yet in the real world applications, often see the unearthed line of load (electrical equipment) shell, the power supply that connects earth leakage protective device does not have earth connection yet, and this causes the generation of electric shock accidents easily.
Summary of the invention
The utility model provides a kind of circuit Leaked Current of Line to Ground simple, with low cost and non-earth leakage protection circuit.
A kind of Leaked Current of Line to Ground and non-earth leakage protection circuit are to have increased a non-Leaked Current of Line to Ground testing circuit (2) on the basis of general leakage protection circuit (1); General leakage protection circuit (1) is an earth leakage protection, and it has two ports of input and output, and the live wire L of input, zero line N and ground wire PE are connected to power supply, and the live wire L1 of output, zero line N1 and ground wire PE1 are connected to load; A kind of Leaked Current of Line to Ground and non-earth leakage protection circuit; it is characterized in that: non-Leaked Current of Line to Ground testing circuit (2) comprises two resistance R 11; R12 and two normally closed switch SW2; SW3; the end of R11 is connected to the zero line N of general leakage protection circuit (1) input; the other end of R11 is connected to the end of SW2; the other end of SW2 is connected to the ground wire PE1 of general leakage protection circuit (1) output; the end of R12 is connected to the zero line N1 of general leakage protection circuit (1) output; the other end of R12 is connected to the end of SW3, and the other end of SW3 is connected to the ground wire PE1 of general leakage protection circuit (1) output.
Beneficial effect:
It has kept the function of general earth leakage protective device, simultaneously it has other two functions: if its an input power supply and an output load all do not have earth connection or imperfect earth, so when load or the cable that is connected with load exist electric leakage dangerous, leakage protection circuit can disconnect being connected of civil power and load, thereby avoids getting an electric shock; If two its input power supplys do not have earth connection or imperfect earth, and when the ground wire terminals of input power supply and live wire generation short circuit, it also can disconnect being connected of civil power and load.
Description of drawings
Accompanying drawing 1 is an enforcement circuit diagram of the present utility model.
Embodiment
Referring to accompanying drawing, be described in detail below in conjunction with 1 pair of the utility model of accompanying drawing.
A kind of Leaked Current of Line to Ground and non-earth leakage protection circuit are to have increased a non-Leaked Current of Line to Ground testing circuit 2 on the basis of general leakage protection circuit 1.General leakage protection circuit 1 is an earth leakage protection, and it comprises an input port, output port, sensitive current transformer CT1, controller 3, test circuit 4, relay R LY1, indicating circuit 5, piezo-resistance MOV1.The live wire L of input, zero line N and ground wire PE are connected to power supply (civil power), and the live wire L1 of output, zero line N1 and ground wire PE1 are connected to load (electrical equipment).Piezo-resistance MOV1 is connected between the live wire L and zero line N of input, for leakage protection circuit and load provide surge voltage protection.Relay R LY1 has K1, K2, three groups of normally-closed contacts of K3, and the fixed contact of K1, K2, K3 is connected respectively to live wire L1, zero line N1 and the ground wire PE1 of output.Test circuit 4 is made up of resistance R 8 and normal open switch SW1, and the end of R8 is linked the zero line N of input, and the other end of R8 is connected to the end of SW1, and the other end of SW1 is connected to the moving contact of K1.Indicating circuit 5 is made up of resistance R 9, rectifier diode D6 and LED 1, the end of R9 is connected to the zero line N1 of output, the other end of R9 is connected to the negative electrode of D6, and the anode of D6 is connected to the negative electrode of LED1, and the anode of LED1 is connected to the live wire L1 of output.When relay R LY1 adhesive, LED1 can be luminous, and the output of indication earth leakage protective device is energized.Sensitive current transformer CT1 is made up of magnet ring, elementary winding and secondary winding.The live wire L of input and zero line N pass magnet ring or on magnet ring around some number of turns, be connected respectively to the moving contact of K1 and K2 again.The ground wire PE of input is connected to the moving contact of K3.The live wire L of input and zero line N pass magnet ring or on magnet ring around the elementary winding of some number of turns as CT1, the secondary winding of CT1 is connected to controller 3, as the input signal of controller 3.The live wire and the zero line that penetrate or pass the CT1 magnet ring are connected to controller 3, for controller 3 provides working power.The output of controller 3 is connected to the coil of relay R LY1.The operation principle of general leakage protection circuit 1 is: when pressing Test Switchboard SW1 or leak current fault taking place; when causing the live wire of the elementary winding of CT1 and zero line difference between current to occur; the secondary winding of CT1 will produce the residual current signal; controller 3 compares the residual current signal of input and inner setting; if the time that residual current surpasses setting and continues to set; controller 3 will be to signal of coil output of relay R LY1; three groups of contacts of relay R LY1 are disconnected; thereby the disconnection civil power is connected with load, and LED 1 is therefore not luminous.
Non-Leaked Current of Line to Ground testing circuit 2 comprises two resistance R 11, R12 and two normally closed switch SW2, SW3; the end of R11 is connected to the zero line N of general leakage protection circuit 1 input; the other end of R11 is connected to the end of SW2; the other end of SW2 is connected to the ground wire PE1 of general leakage protection circuit 1 output; the end of R12 is connected to the zero line N1 of general leakage protection circuit 1 output; the other end of R12 is connected to the end of SW3, and the other end of SW3 is connected to the ground wire PE1 of general leakage protection circuit 1 output.When product normally used, SW2 and SW3 were in closure.When doing the safety test, need SW2 and SW3 are disconnected.R11 and the SW2 effect in circuit is: when load (electrical equipment) outer casing electrification, if the input power supply of earth leakage protective device and output load all do not have earth connection or imperfect earth, R11 and SW2 provide current path for non-Ground leakage current so, and leakage current flows along the zero line N of ground wire PE1, the SW2 of the live wire L1 of the live wire of the live wire L of input, the elementary winding of CT1, K1, output, load (electrical equipment) shell, output, R11, input; Because this leakage current flows through from the live wire of the elementary winding of CT1; but do not flow through the zero line of the elementary winding of CT1; therefore the live wire and the zero line of the elementary winding of CT1 can produce difference between current, when this difference between current greater than certain setting and during the time that continues to set, leakage protection circuit is connected with regard to deenergization and load.R12 and the SW3 effect in circuit is: when the ground wire terminals of input power supply and live wire generation short circuit, if the input power supply does not have earth connection or imperfect earth, R12 and SW3 provide current path for non-Ground leakage current so, and leakage current flows along ground wire PE1, the SW3 of ground wire PE, the K3 of the live wire L of input, input, output, R12, zero line N1, the K2 of output, the zero line of the elementary winding of CT1, the zero line N of input; Because this leakage current flows through from the zero line of the elementary winding of CT1; but do not flow through the live wire of the elementary winding of CT1; therefore the live wire and the zero line of the elementary winding of CT1 can produce difference between current, when this difference between current greater than certain setting and during the time that continues to set, leakage protection circuit is connected with regard to deenergization and load.Add in the circuit corresponding position of portable residual current circuit breaker and be connected R12 and SW3, can satisfy the leakage current testing requirement of GB4706.12 Fig. 3 single-phase water heater.
The resistance of R11, R12 will be determined according to the regulation residue operating current of earth leakage protective device.
Claims (1)
1. a Leaked Current of Line to Ground and non-earth leakage protection circuit, the general leakage protection circuit (1) that comprises earth leakage protection, general leakage protection circuit (1) has input and output, the live wire L of input, zero line N and ground wire PE are connected to power supply, and the live wire L1 of output, zero line N1 and ground wire PE1 are connected to load; It is characterized in that: also comprise non-Leaked Current of Line to Ground testing circuit (2); non-Leaked Current of Line to Ground testing circuit (2) comprises two resistance R 11; R12 and two normally closed switch SW2; SW3; the end of R11 is connected to the zero line N of general leakage protection circuit (1) input; the other end of R11 is connected to the end of SW2; the other end of SW2 is connected to the ground wire PE1 of general leakage protection circuit (1) output; the end of R12 is connected to the zero line N1 of general leakage protection circuit (1) output; the other end of R12 is connected to the end of SW3, and the other end of SW3 is connected to the ground wire PE1 of general leakage protection circuit (1) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200692930U CN202034760U (en) | 2011-03-16 | 2011-03-16 | Earth leakage and non-earth leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200692930U CN202034760U (en) | 2011-03-16 | 2011-03-16 | Earth leakage and non-earth leakage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202034760U true CN202034760U (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2011200692930U Expired - Fee Related CN202034760U (en) | 2011-03-16 | 2011-03-16 | Earth leakage and non-earth leakage protection circuit |
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| Country | Link |
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| CN (1) | CN202034760U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988057A (en) * | 2015-02-09 | 2016-10-05 | 苏州益而益电器制造有限公司 | Power utilization detection circuit |
| CN108321767A (en) * | 2018-02-28 | 2018-07-24 | 厦门大学嘉庚学院 | With ground wire electric fireproof method |
| WO2021174747A1 (en) * | 2020-03-05 | 2021-09-10 | 深圳市高视达电子有限公司 | Immersion electric shock prevention circuit and method |
-
2011
- 2011-03-16 CN CN2011200692930U patent/CN202034760U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988057A (en) * | 2015-02-09 | 2016-10-05 | 苏州益而益电器制造有限公司 | Power utilization detection circuit |
| CN105988057B (en) * | 2015-02-09 | 2019-04-02 | 苏州益而益电器制造有限公司 | Use power detection circuit |
| CN108321767A (en) * | 2018-02-28 | 2018-07-24 | 厦门大学嘉庚学院 | With ground wire electric fireproof method |
| CN108321767B (en) * | 2018-02-28 | 2023-10-27 | 厦门大学嘉庚学院 | Electrical fire prevention method for earth wire |
| WO2021174747A1 (en) * | 2020-03-05 | 2021-09-10 | 深圳市高视达电子有限公司 | Immersion electric shock prevention circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20180316 |