CN104917147A - EN voltage-dividing and sampling type leakage protector - Google Patents
EN voltage-dividing and sampling type leakage protector Download PDFInfo
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- CN104917147A CN104917147A CN201510271105.5A CN201510271105A CN104917147A CN 104917147 A CN104917147 A CN 104917147A CN 201510271105 A CN201510271105 A CN 201510271105A CN 104917147 A CN104917147 A CN 104917147A
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Abstract
The invention discloses an EN voltage-dividing and sampling type leakage protector, which comprises an amplifying circuit, a releaser, a zero-sequence current transformer, a silicon controlled rectifier and a ground wire transformer, wherein the amplifying circuit is used for triggering the silicon controlled rectifier, at least one voltage-dividing capacitor is arranged between a ground wire and a zero line, the voltage-dividing capacitor is connected with at least one resistor in series, a common connection end of the voltage-dividing capacitor and the resistor serves as a voltage-dividing end, and the voltage-dividing end is directly connected with the silicon controlled rectifier or connected with the silicon controlled rectifier through the amplifier. The EN voltage-dividing and sampling type leakage protector overcomes the defects in the prior art that a voltage mutual inductance coil needs to be additionally arranged for detecting leakage voltage of the ground wire, and detects the leakage voltage of the ground wire by utilizing a voltage dividing principle; and a voltage type mode and a current type mode of the EN voltage-dividing and sampling type leakage protector work simultaneously when a change-over switch is in poor contact, and the potential hidden dangers such as protection failure caused by poor contact of the change-over switch are removed.
Description
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to E (ground wire) N (zero line) dividing potential drop sampling type earth leakage protective device.
Background technology
Existing ground wire electrified detection loop have employed mutual induction of voltage coil, because mutual inductor processing technology is complicated, magnetic core permeability requires high, and homogeneity of product management and control requires strict, therefore, need to redesign a kind of circuit that just can detect ground wire voltage without mutual induction of voltage coil.
Summary of the invention
(1) technical problem that will solve
Object of the present invention will overcome above-mentioned shortcoming exactly, aims to provide a kind of EN dividing potential drop sampling type earth leakage protective device.
(2) technical scheme
For solving the problem; the present invention proposes a kind of EN dividing potential drop sampling type earth leakage protective device; comprise amplifying circuit, release, zero sequence current mutual inductor, controllable silicon and ground wire instrument transformer; amplifying circuit is for triggering controllable silicon; at least one derided capacitors is provided with between ground wire and zero line; described derided capacitors is in series with at least one resistor, the public connecting end of described derided capacitors and resistor as a point pressure side, described point of press bond controllable silicon or connect controllable silicon by amplifier.
Further, described amplifier comprises triode Q2 and triode Q3, the base stage of described point of pressure side connecting triode Q3, and the base stage of described triode Q2 is controlled by triode Q3; Electric capacity C1 is also provided with between described zero line and ground wire.
Further, this circuit also comprises change over switch, triode Q1 and mode indicating lamp LED3; Described change over switch comprises contact S3 and S4; Described triode Q1 and mode indicating lamp LED3 is switched by contact S4; Triode Q1 connects a point pressure side;
When contact S3 short circuit ground wire instrument transformer, S4 connects mode indicating lamp LED3, and being used to indicate current is voltage-type mode of operation;
When contact S3 disconnects, S4 connects triode Q1, and mode indicating lamp LED3 goes out, triode Q1 conducting, and described point of pressure side is electronegative potential, and ground wire instrument transformer is for responding to ground wire leakage current, and mode-conversion is current mode mode of operation.
Further, be also provided with the abnormal indicating circuit of ground wire electrification, the abnormal indicating circuit of described ground wire electrification comprises indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2, and described indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2 are connected between zero line and ground wire successively; Described indicator light LED2 is also parallel with protection diode D3.
(3) beneficial effect
Compared with prior art, the present invention has the following advantages: instant invention overcomes prior art needs making alive mutual inductor to detect the defect of ground wire electrical leakage voltage, utilizes voltage divider principle to detect ground wire electrical leakage voltage; During change over switch loose contact, voltage-type, current mode works simultaneously, solves because of potential risks such as not protecting of causing during change over switch loose contact.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of EN dividing potential drop sampling type earth leakage protective device of the present invention;
Fig. 2 is the circuit theory diagrams of EN dividing potential drop sampling type earth leakage protective device of the present invention;
Fig. 3 is the circuit theory diagrams not comprising amplifier of EN dividing potential drop sampling type earth leakage protective device of the present invention;
Fig. 4 is the circuit theory diagrams of embodiment two;
Fig. 5 is the circuit theory diagrams not comprising amplifier of embodiment two;
Fig. 6 is the circuit theory diagrams of embodiment three;
Fig. 7 is the circuit theory diagrams not comprising amplifier of embodiment three.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
As Fig. 1, shown in Fig. 2 and Fig. 3, the present invention proposes a kind of EN dividing potential drop sampling type earth leakage protective device, comprise amplifying circuit, release, zero sequence current mutual inductor ZCT1, controllable silicon SCR 1 and ground wire E instrument transformer ZCT2, amplifying circuit is for triggering controllable silicon SCR 1, wherein, amplifying circuit comprises amplification chip IC1, at least one derided capacitors is provided with between ground wire E and zero line N, described derided capacitors is in series with at least one resistor, the public connecting end of described derided capacitors and resistor is as a point pressure side, described point of press bond controllable silicon SCR 1 or by amplifier connect controllable silicon SCR 1.
Described amplifier comprises triode Q2 and triode Q3, the base stage of described point of pressure side connecting triode Q3, and the base stage of described triode Q2 is controlled by triode Q3;
Electric capacity C1 is also provided with between described zero line N and ground wire E.
This circuit also comprises change over switch, triode Q1 and mode indicating lamp LED3; Described change over switch comprises contact S3 and S4; Described triode Q1 and mode indicating lamp LED3 is switched by contact S4; Triode Q1 connects a point pressure side;
When contact S3 short circuit ground wire E instrument transformer ZCT2, S4 connect mode indicating lamp LED3, being used to indicate current is voltage-type mode of operation;
When contact S3 disconnects, S4 connects triode Q1, and mode indicating lamp LED3 goes out, triode Q1 conducting, and described point of pressure side is electronegative potential, and ground wire E instrument transformer ZCT2 is for responding to ground wire E leakage current, and mode-conversion is current mode mode of operation.
Also be provided with the abnormal indicating circuit of ground wire electrification, the abnormal indicating circuit of described ground wire electrification comprises indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2, and described indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2 are connected between zero line N and ground wire E successively; Described indicator light LED2 is also parallel with protection diode D3.
Described resistor is one or more in resistance, electric capacity or equivalent resistance.
Instant invention overcomes prior art needs making alive mutual inductor to detect the defect of ground wire electrical leakage voltage, utilizes voltage divider principle to detect ground wire electrical leakage voltage; During change over switch loose contact, voltage-type, current mode works simultaneously, solves because of potential risks such as not protecting of causing during change over switch loose contact;
Operation principle is as follows:
Voltage-type pattern
As shown in Figure 2, connect S3, S4 synchro switch and LED3 is lighted (instructed voltage type mode of operation), Q1 ends, ZCT2 coil is forced by S3 short circuit, and no signal exports, and meanwhile, E terminal voltage is through C4, voltage-stabiliser tube DW1, R3, form loop to N end, detect voltage to take out from D4 end, when E-N terminal voltage exceeds predeterminated voltage, Q3, Q2 conducting, electric current triggers controllable silicon SCR 1 conducting through R6, causes tripping coil L1 adhesive, tripping mechanism drives the release of S1, S2 contact, and output exports without electricity; Electric capacity C1 can improve the input impedance between E-N, and its insulation impedance is infinitely great; Voltage-stabiliser tube D6 can solve when earth connection good earth, and indicator light LED2 plays bright voltage and is greater than voltage-stabiliser tube voltage, and when solving low-voltage between E-N, electrical network clutter crest voltage lights indicator light phenomenon.
Current mode pattern
Connecting S3, S4 synchro switch makes LED3 extinguish (current mode mode of operation), and Q1 saturation conduction causes D4 Non voltage output, Q3, Q2 end, meanwhile, S3 contact disconnects, the induction of ZCT2 ground line current mutual inductor exports, and when IC1 detects that ZCT2 electric current reaches preset value, IC1 output current triggers controllable silicon SCR 1 conducting through D2, cause tripping coil L1 adhesive, tripping mechanism drives the release of S1, S2 contact, and output exports without electricity.
In addition, above-mentioned Q2, Q3 can not use, and physical circuit schematic diagram is see Fig. 3, and its point of pressure side directly connects silicon controlled trigger end.
Embodiment two
Deletion voltage-stabiliser tube DW1 in the present embodiment, diode D4, increase diode D5, resistance R4 and electric capacity C3, and resistor portions forms equivalent resistance by R3, R4 and C3, and physical circuit is see Fig. 4.
Q2, Q3 are deleted in the basis of Fig. 4, and physical circuit is see Fig. 5.
Embodiment three
On Fig. 4 basis, resistance C3 electric capacity C7 substitutes, and resistor portions forms equivalent resistance by C7, R4 and C3, and physical circuit is see Fig. 6.
Q2, Q3 are deleted in the basis of Fig. 6, and physical circuit is see Fig. 7.
Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing 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 (4)
1. an EN dividing potential drop sampling type earth leakage protective device; comprise amplifying circuit, release, zero sequence current mutual inductor, controllable silicon and ground wire instrument transformer; amplifying circuit is for triggering controllable silicon; it is characterized in that: between ground wire and zero line, be provided with at least one derided capacitors; described derided capacitors is in series with at least one resistor; the public connecting end of described derided capacitors and resistor as a point pressure side, described point of press bond controllable silicon or connect controllable silicon by amplifier.
2. EN dividing potential drop sampling type earth leakage protective device according to claim 1, it is characterized in that: described amplifier comprises triode Q2 and triode Q3, the base stage of described point of pressure side connecting triode Q3, the base stage of described triode Q2 is controlled by triode Q3; Electric capacity C1 is also provided with between described zero line and ground wire.
3. EN dividing potential drop sampling type earth leakage protective device according to claim 1, is characterized in that: this circuit also comprises change over switch, triode Q1 and mode indicating lamp LED3; Described change over switch comprises contact S3 and S4; Described triode Q1 and mode indicating lamp LED3 is switched by contact S4; Triode Q1 connects a point pressure side;
When contact S3 short circuit ground wire instrument transformer, S4 connects mode indicating lamp LED3, and being used to indicate current is voltage-type mode of operation;
When contact S3 disconnects, S4 connects triode Q1, and mode indicating lamp LED3 goes out, triode Q1 conducting, and described point of pressure side is electronegative potential, and ground wire instrument transformer is for responding to ground wire leakage current, and mode-conversion is current mode mode of operation.
4. the EN dividing potential drop sampling type earth leakage protective device according to any one of claims 1 to 3, it is characterized in that: be also provided with the abnormal indicating circuit of ground wire electrification, the abnormal indicating circuit of described ground wire electrification comprises indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2, and described indicator light LED2, voltage-stabiliser tube D6 and electric capacity C2 are connected between zero line and ground wire successively; Described indicator light LED2 is also parallel with protection diode D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510271105.5A CN104917147B (en) | 2015-05-25 | 2015-05-25 | Ground wire zero curve partial pressure sampling type earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510271105.5A CN104917147B (en) | 2015-05-25 | 2015-05-25 | Ground wire zero curve partial pressure sampling type earth leakage protective device |
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| Publication Number | Publication Date |
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| CN104917147A true CN104917147A (en) | 2015-09-16 |
| CN104917147B CN104917147B (en) | 2018-04-13 |
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| CN201510271105.5A Active CN104917147B (en) | 2015-05-25 | 2015-05-25 | Ground wire zero curve partial pressure sampling type earth leakage protective device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070177325A1 (en) * | 2004-04-19 | 2007-08-02 | Sandro Zandonella Balco | Method and safety device for ground fault circuit |
| CN201781263U (en) * | 2010-05-10 | 2011-03-30 | 厦门振泰成科技有限公司 | Electric-shock protection wall overcurrent leakage protection circuit of wall switch |
| CN102324717A (en) * | 2011-10-05 | 2012-01-18 | 刘睿刚 | Leakage protection device |
| CN104577971A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Outage trip protection plug |
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN204720959U (en) * | 2015-05-25 | 2015-10-21 | 余姚市嘉荣电子电器有限公司 | EN dividing potential drop sampling type earth leakage protective device |
-
2015
- 2015-05-25 CN CN201510271105.5A patent/CN104917147B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070177325A1 (en) * | 2004-04-19 | 2007-08-02 | Sandro Zandonella Balco | Method and safety device for ground fault circuit |
| CN201781263U (en) * | 2010-05-10 | 2011-03-30 | 厦门振泰成科技有限公司 | Electric-shock protection wall overcurrent leakage protection circuit of wall switch |
| CN102324717A (en) * | 2011-10-05 | 2012-01-18 | 刘睿刚 | Leakage protection device |
| CN104577971A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Outage trip protection plug |
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN204720959U (en) * | 2015-05-25 | 2015-10-21 | 余姚市嘉荣电子电器有限公司 | EN dividing potential drop sampling type earth leakage protective device |
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| CN104917147B (en) | 2018-04-13 |
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