CN103066456A - Protective plug capable of checking leakage of electricity - Google Patents
Protective plug capable of checking leakage of electricity Download PDFInfo
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- CN103066456A CN103066456A CN2012104957253A CN201210495725A CN103066456A CN 103066456 A CN103066456 A CN 103066456A CN 2012104957253 A CN2012104957253 A CN 2012104957253A CN 201210495725 A CN201210495725 A CN 201210495725A CN 103066456 A CN103066456 A CN 103066456A
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention discloses a protective plug capable of checking leakage of electricity. The protective plug capable of checking leakage of electricity comprises three electrodes of a phrase line, a zero line and an earth line, an electricity leakage checking mutual inductor, a testing circuit, a release, a rectifying circuit, a power source depressurization and a controllable silicon, and the phrase line, the zero line and the earth line are respectively provided with a switch. The protective plug capable of checking leakage of electricity is further provided with a current checking mutual inductor, a voltage checking mutual inductor, a switching circuit and at least one amplifying circuit. The switching circuit is respectively connected with the current checking mutual inductor, a secondary coil of the voltage checking mutual inductor and an input end of the amplifying circuit. The switching circuit is used for choosing to connect the amplifying circuit and the voltage checking mutual inductor or to connect the amplifying circuit and the current checking mutual inductor. The output end of the amplifying circuit is connected with a controllable silicon trigger electrode, one end of the secondary coil of the voltage checking mutual inductor is connected with the ground, and the other end of the secondary coil of the voltage checking mutual inductor is connected with a big resistance value current-limiting depressurization circuit in series and then connected with the zero line. The protective plug capable of checking leakage of electricity overcomes the drawbacks that electrification of the traditional earth line induction voltage and the zero line leads to mistrip, enables functions of the protective plug capable of checking leakage of electricity to be abundant and is wide in protecting scope.
Description
Technical field
The present invention relates to the test plug technical field, particularly a kind of current leakage detection protection plug.
Background technology
Existing plug with earth wire live protector; such as all-purpose leakage protection plug; generally refer to and to disconnect when electric leakage appears in the phase zero line at protective device (plug); can disconnect when being also included within ground wire electrification; it generally comprises the phase that is connected with fixed contact by the movable contact flexure strip; zero; ground three utmost points; pass phase; zero sequence current mutual inductor between the zero line; the test loop; amplifying circuit; rectifier; controllable silicon; release; pass the zero sequence current mutual inductor of ground wire; it is except detecting the load phase; have or not outside the leakage current between the zero line; whether also detect ground wire has leakage current to pass through; work as phase line; when zero line or ground wire leakage current occurs respectively or simultaneously; two magnetic test coils all can make release immediately with phase; zero; ground wire all disconnects; namely cut off the electricity supply; thereby effectively ensured personal safety, therefore oneself is widely applied in household electrical appliance.
But above-mentioned all-purpose leakage protection plug has following two weak points:
When 1, the voltage detecting instrument transformer detected on utilizing ground wire, the electric current on user's ground wire was very complicated, produces easily induced voltage and causes mistrip.
2, when reality is used, there is the charged situation of zero line in some electric substation, and this electricity is on not impact of electrical equipment, and still the voltage detecting instrument transformer detects and causes mistrip on the easy triggering ground wire.
Summary of the invention
The technical problem that (one) will solve
The technical problem to be solved in the present invention is that the current detecting instrument transformer that is connected with ground wire will be set, and carry out the selection of instrument transformer with change-over circuit, when zero line is not charged, can select ground wire to power on and press the detection instrument transformer to detect, when zero line is with voltage, the voltage detecting instrument transformer may be malfunctioning on the ground wire, and this moment, the user can disconnect voltage detecting instrument transformer on the ground wire, selects the current detecting instrument transformer on the ground wire to detect.
(2) technical scheme
For addressing the above problem, a kind of current leakage detection protection plug that the present invention proposes, phase line L, the zero line N, ground wire E three utmost points that comprise each belt switch, detection of electrical leakage instrument transformer, hookup, release, rectification circuit, power supply step-down, controllable silicon is characterized in that: current detecting instrument transformer, voltage detecting instrument transformer, change-over circuit and at least one amplifying circuit also are set; Described change-over circuit is connected with the secondary coil of described current detecting instrument transformer, described voltage detecting instrument transformer and the input of described amplifying circuit respectively, described change-over circuit is used for selecting amplifying circuit to be connected with the voltage detecting instrument transformer or selects amplifying circuit to be connected with the current detecting instrument transformer, the output of described amplifying circuit is connected with the controllable silicon trigger electrode, primary coil one end of described voltage detecting instrument transformer connects ground wire E, and the other end is connected and is connected with zero line N behind the large resistance current limliting reduction voltage circuit.
As a further improvement on the present invention, the parallel connection of secondary windings of described voltage detecting instrument transformer has the first regulating resistance.
As a further improvement on the present invention, described current detecting instrument transformer is parallel with the second regulating resistance.
As a further improvement on the present invention, connect induced voltage between the input of described zero line N, ground wire E and eliminate circuit.
As a further improvement on the present invention, described induced voltage elimination circuit is electric capacity.
As a further improvement on the present invention, described large resistance current limliting reduction voltage circuit is insulation resistance or electric capacity.
As a further improvement on the present invention, the material of described voltage detecting instrument transformer and current detecting instrument transformer is iron-nickel alloy or ultracrystallite.、
As a further improvement on the present invention, described amplifying circuit is change over switch, key switch or toggle switch.(3) beneficial effect
The invention has the beneficial effects as follows: overcome the charged defective that causes mistrip of original ground wire induced voltage and zero line.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of the amplifying circuit of the single double input end of the present invention;
Fig. 2 is the circuit diagram of the amplifying circuit of the single double input end of the present invention;
Fig. 3 is the circuit theory schematic diagram of two amplifying circuits of inputting separately of the present invention;
Fig. 4 is the circuit diagram of two amplifying circuits of inputting separately of the present invention;
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Embodiment one
As depicted in figs. 1 and 2, a kind of current leakage detection protection plug, phase line L, the zero line N, ground wire E three utmost points that comprise each belt switch K, hookup, release, rectification circuit DC, power supply step-down R1, controllable silicon SCR that detection of electrical leakage instrument transformer ZCT1, R2 and AN form also arrange the amplifying circuit IC of voltage detecting instrument transformer ZCT2, current detecting instrument transformer ZCT3, change-over circuit K1 and a double input end; Described change-over circuit K1 is connected with the secondary coil of described current detecting instrument transformer ZCT3, described voltage detecting instrument transformer ZCT2 and the input of described amplifying circuit IC respectively, described change-over circuit K1 is used for selecting amplifying circuit IC to be connected with voltage detecting instrument transformer ZCT2 or selects amplifying circuit IC to be connected with current detecting instrument transformer ZCT3, the output of described amplifying circuit IC touches the SCR trigger electrode with controllable silicon and is connected, primary coil one end of described voltage detecting instrument transformer ZCT2 connects ground wire E, and the other end is connected and is connected with zero line N behind the large resistance current limliting reduction voltage circuit.
The parallel connection of secondary windings of described voltage detecting instrument transformer has the first regulating resistance R4, and described current detecting instrument transformer is parallel with the second regulating resistance R5, and R4, R5 are used for regulating the tripping voltage of zero line N and ground wire E.
Connect induced voltage between the input of described zero line N, ground wire E and eliminate capacitor C 1.
Described large resistance current limliting reduction voltage circuit R
6Be insulation resistance or electric capacity, and R
6Resistance should satisfy insulating requirements.
For sensitivity and the precision that guarantees instrument transformer, the material of described voltage detecting instrument transformer and current detecting instrument transformer is iron-nickel alloy or ultracrystallite.
Described amplifying circuit is change over switch, key switch or toggle switch.
In the not charged situation of zero line N, change-over circuit K1 in case ground wire electrification just can trigger controllable silicon SCR, makes the release tripping operation with amplifying circuit IC and voltage detecting instrument transformer ZCT2 conducting; In the charged situation of zero line, the just situation of mistrip of plugged may appear, this moment, the user was allocated to the other end with change-over circuit K1, make amplifying circuit IC and current detecting instrument transformer ZCT3 conducting, just can produce voltage by current detecting instrument transformer ZCT3 behind the ground wire electrification, thereby trigger the controllable silicon SCR tripping operation.So just overcome the charged defective that causes mistrip of original ground wire induced voltage and zero line, made the function of leakage protecting plug abundanter, protection range is wider.
Embodiment two
As shown in Figure 3 and Figure 4, compare with embodiment one, the difference of this enforcement is: adopt two separately amplifying circuit IC1 and the IC2 of input, in order to prevent the mutually mutual interference of IC1 and the reverse circuit of IC2 output, diode D1 is set between IC1 output and controllable silicon SCR especially, diode D2 is set between IC2 output and the controllable silicon SCR, detection of electrical leakage instrument transformer ZCT1 connects amplifying circuit IC1, and voltage detecting instrument transformer ZCT2 is connected change-over circuit K1 and connects IC2 with current detecting instrument transformer ZCT3.
The course of work is identical with embodiment one, and both in the not charged situation of zero line N, change-over circuit K1 in case ground wire electrification just can trigger controllable silicon SCR, made the release tripping operation with amplifying circuit IC2 and voltage detecting instrument transformer ZCT2 conducting; In the charged situation of zero line, the just situation of mistrip of plugged may appear, this moment, the user was allocated to the other end with change-over circuit K1, make amplifying circuit IC2 and current detecting instrument transformer ZCT3 conducting, just can produce voltage by current detecting instrument transformer ZCT3 behind the ground wire electrification, thereby trigger the controllable silicon SCR tripping operation.So just overcome the charged defective that causes mistrip of original ground wire induced voltage and zero line, made the function of leakage protecting plug abundanter, protection range is wider.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. current leakage detection protection plug, phase line L, the zero line N, ground wire E three utmost points that comprise each belt switch, detection of electrical leakage instrument transformer, hookup, release, rectification circuit, power supply step-down, controllable silicon is characterized in that: current detecting instrument transformer, voltage detecting instrument transformer, change-over circuit and at least one amplifying circuit also are set; Described change-over circuit is connected with the secondary coil of described current detecting instrument transformer, described voltage detecting instrument transformer and the input of described amplifying circuit respectively, described change-over circuit is used for selecting amplifying circuit to be connected with the voltage detecting instrument transformer or selects amplifying circuit to be connected with the current detecting instrument transformer, the output of described amplifying circuit is connected with the controllable silicon trigger electrode, primary coil one end of described voltage detecting instrument transformer connects ground wire E, and the other end is connected and is connected with zero line N behind the large resistance current limliting reduction voltage circuit.
2. current leakage detection protection plug according to claim 1, it is characterized in that: the parallel connection of secondary windings of described voltage detecting instrument transformer has the first regulating resistance.
3. current leakage detection protection plug according to claim 1, it is characterized in that: described current detecting instrument transformer is parallel with the second regulating resistance.
4. current leakage detection protection plug according to claim 1 is characterized in that: connect induced voltage between the input of described zero line N, ground wire E and eliminate circuit.
5. current leakage detection protection plug according to claim 4 is characterized in that: it is electric capacity that described induced voltage is eliminated circuit.
6. current leakage detection protection plug according to claim 1, it is characterized in that: described large resistance current limliting reduction voltage circuit is insulation resistance or electric capacity.
7. such as each described current leakage detection protection plug of claim 1 to 6, it is characterized in that: the material of described voltage detecting instrument transformer and current detecting instrument transformer is iron-nickel alloy or ultracrystallite.
8. current leakage detection protection plug according to claim 1, it is characterized in that: described amplifying circuit is change over switch, key switch or toggle switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210495725.3A CN103066456B (en) | 2012-11-27 | 2012-11-27 | Protective plug capable of checking leakage of electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210495725.3A CN103066456B (en) | 2012-11-27 | 2012-11-27 | Protective plug capable of checking leakage of electricity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103066456A true CN103066456A (en) | 2013-04-24 |
| CN103066456B CN103066456B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210495725.3A Active CN103066456B (en) | 2012-11-27 | 2012-11-27 | Protective plug capable of checking leakage of electricity |
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| Country | Link |
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| CN (1) | CN103066456B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474955A (en) * | 2013-09-27 | 2013-12-25 | 余姚市嘉荣电子电器有限公司 | Earth leakage protection plug |
| CN103490237A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug having over-temperature detecting function |
| CN103490238A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protecting plug |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| CN1848580A (en) * | 2006-03-03 | 2006-10-18 | 广东珠江开关有限公司 | Leakage plug with fireproof function |
| CN202142737U (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Earth leakage protection plug |
| CN202424123U (en) * | 2012-01-13 | 2012-09-05 | 钱加灿 | Electric leakage protector with high-sensitivity ground wire electrification protection function |
| CN202917763U (en) * | 2012-11-27 | 2013-05-01 | 钱加灿 | Electric leakage detection protection plug |
-
2012
- 2012-11-27 CN CN201210495725.3A patent/CN103066456B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| CN1848580A (en) * | 2006-03-03 | 2006-10-18 | 广东珠江开关有限公司 | Leakage plug with fireproof function |
| CN202142737U (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Earth leakage protection plug |
| CN202424123U (en) * | 2012-01-13 | 2012-09-05 | 钱加灿 | Electric leakage protector with high-sensitivity ground wire electrification protection function |
| CN202917763U (en) * | 2012-11-27 | 2013-05-01 | 钱加灿 | Electric leakage detection protection plug |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474955A (en) * | 2013-09-27 | 2013-12-25 | 余姚市嘉荣电子电器有限公司 | Earth leakage protection plug |
| CN103490237A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug having over-temperature detecting function |
| CN103490238A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protecting plug |
| CN103490238B (en) * | 2013-09-27 | 2016-06-29 | 余姚市嘉荣电子电器有限公司 | Leakage protecting plug |
| CN103490237B (en) * | 2013-09-27 | 2016-07-06 | 余姚市嘉荣电子电器有限公司 | Leakage protecting plug with overtemperature detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103066456B (en) | 2014-12-10 |
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