CN2728067Y - Self-reset leakage protector - Google Patents
Self-reset leakage protector Download PDFInfo
- Publication number
- CN2728067Y CN2728067Y CN 200420053999 CN200420053999U CN2728067Y CN 2728067 Y CN2728067 Y CN 2728067Y CN 200420053999 CN200420053999 CN 200420053999 CN 200420053999 U CN200420053999 U CN 200420053999U CN 2728067 Y CN2728067 Y CN 2728067Y
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- Prior art keywords
- circuit
- leakage current
- current
- leakage
- zero sequence
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Abstract
The utility model discloses a self-reset leakage protector. As a consequence that a zero sequence current transformer L3 is connected with a constant-current and alternating current biasing circuit, the magnetic core of the zero sequence current transformer L3 firstly generates a stable magnetic field, which improves the reliability of the complete machine and the detection sensitivity of the electric leakage when the small leakage current is in linear condition. As a consequence of adopting an analogue-digital conversion circuit and an indicator circuit for the leakage current, the numerical value of the leakage current is intuitively displayed, and the judgment and the eliminating of the defect are convenient; besides, a logic control circuit can control a test circuit to continuously detect whether the electric leakage is eliminated after a subscriber line circuit is cut off, which realizes the automatic resetting to supply users with current when the defect is cleared.
Description
Technical field
The utility model relates to a kind of circuit safety protective device, relates in particular to a kind of earth leakage protective device.
Background technology
In order to protect various electric equipments and personal safety, earth leakage protective device is widely used.But existing earth leakage protective device has the following disadvantages.1, can not continue to detect the releasing situation of leak current fault after the tripping operation, and automatically reset; 2, the induction magnetic flux of the zero sequence current mutual inductor of earth leakage protective device is subject to the interference of the external world and electrical equipment, is easy to generate misoperation; 3, no leakage current shows, can not judge the position that the size that breaks down and fault may occur according to the size of leakage current.
Summary of the invention
Technical problem to be solved in the utility model provides strong, the automatic detection of a kind of antijamming capability, the automatically reset earth leakage protective device that automatically resets.
For achieving the above object; the technical solution of the utility model is: the earth leakage protective device that automatically resets comprises power circuit; leakage current detection circuit; the leakage current amplifying circuit; the leakage current indicating circuit; logic control element and control relay unit; described leakage current detection circuit comprises zero sequence current mutual inductor L3; described zero sequence current mutual inductor L3 is connected with the constant current ac bias magnetic circuit that the magnetic core that makes zero sequence current mutual inductor L3 produces stabilizing magnetic field; the primary coil of zero sequence current mutual inductor L3 for from the earth leakage protective device that automatically resets output live wire and the zero line introduced; the secondary coil L32 of zero sequence current mutual inductor L3 is connected with leakage current detection circuit; leakage current detection circuit is connected with the leakage current amplifying circuit; the leakage current amplifying circuit is connected with analog to digital conversion circuit; analog to digital conversion circuit is connected with logic control element with the leakage current indicating circuit, and logic control element is connected with leakage current detection circuit with the control relay unit.
As a kind of improvement, the described constant current ac bias magnetic circuit of the magnetic core generation stabilizing magnetic field of zero sequence current mutual inductor L3 that makes comprises voltage stabilizing didoe VD1, voltage stabilizing didoe VD2, diode D1, diode D2, bridge rectifier D3, potentiometer RP1, resistance R 1 is to resistance R 4 and triode V1, triode V2, voltage stabilizing didoe VD1, voltage stabilizing didoe VD2 forms the secondary AC voltage stabilizing circuit, diode D1, diode D2 forms temperature-compensation circuit, with triode V1, triode V2 is that core is formed current stabilization circuit, potentiometer RP2, capacitor C 1 is formed phase compensating circuit.
As a kind of further improvement, described control relay unit comprises capacitor C 15, bridge rectifier D 12, bridge rectifier D 13, photo-electric control module I C7, relay J 1, relay J 2; Wherein bridge rectifier D 12, D13 connect photo-electric control module I C7, and photo-electric control module I C7 connects relay J 2, and relay J 1 is controlled by logic control element IC8.
Owing to adopt technique scheme, described zero sequence current mutual inductor L3 is connected with the constant current ac bias magnetic circuit that the magnetic core that makes zero sequence current mutual inductor L3 produces stabilizing magnetic field, make the magnetic core of zero sequence current mutual inductor L3 at first produce a stable magnetic field, hour enter linear condition at leakage current, improved the reliability of detection of electrical leakage sensitivity and complete machine; Owing to adopted analog to digital conversion circuit and leakage current indicating circuit, the numerical value of leakage current is shown intuitively, made things convenient for failure judgment and releasing; And the continuation detection whether logic control circuit controllable testing circuit leaks electricity and remove the subscriber's line after cutting off the electricity supply when fault is got rid of, can automatically reset, and is user's power supply.
Description of drawings
Accompanying drawing is the electrical schematic diagram of the utility model embodiment.
Embodiment
As shown in drawings; the earth leakage protective device that automatically resets comprises power circuit; leakage current detection circuit; the leakage current amplifying circuit; the leakage current indicating circuit; logic control element and control relay unit; described leakage current detection circuit comprises zero sequence current mutual inductor L3; described zero sequence current mutual inductor L3 is connected with the constant current ac bias magnetic circuit that the magnetic core that makes zero sequence current mutual inductor L3 produces stabilizing magnetic field; the primary coil of zero sequence current mutual inductor L3 for from the earth leakage protective device that automatically resets output live wire and the zero line introduced; the secondary coil L32 of zero sequence current mutual inductor L3 is connected with leakage current detection circuit; leakage current detection circuit is connected with the leakage current amplifying circuit; the leakage current amplifying circuit is connected with analog to digital conversion circuit; analog to digital conversion circuit is connected with logic control element with the leakage current indicating circuit, and logic control element is connected with leakage current detection circuit with the control relay unit.
Wherein, the described constant current ac bias magnetic circuit of the magnetic core generation stabilizing magnetic field of zero sequence current mutual inductor L3 that makes comprises voltage stabilizing didoe VD1, voltage stabilizing didoe VD2, diode D1, diode D2, bridge rectifier D3, potentiometer RP1, resistance R 1 is to resistance R 4 and triode V1, triode V2, voltage stabilizing didoe VD1, voltage stabilizing didoe VD2 forms the secondary AC voltage stabilizing circuit, diode D1, diode D2 forms temperature-compensation circuit, with triode V1, triode V2 is that core is formed current stabilization circuit, potentiometer RP2, capacitor C 1 is formed phase compensating circuit, when skew or voltage ripple of power network take place mains frequency, current stabilization circuit is carried out compensation on phase place and the voltage.
Wherein, described control relay unit comprises capacitor C 15, bridge rectifier D 12, bridge rectifier D 13, photo-electric control module I C7, relay J 1, relay J 2; Wherein bridge rectifier D 12, D13 connect photo-electric control module I C7, and photo-electric control module I C7 connects relay J 2, and relay J 1 is controlled by logic control element IC8.
Operation principle of the present utility model is:
Primary coil on the zero sequence current mutual inductor L3 be pass its magnetic core interstitial hole from the earth leakage protective device that automatically resets output live wire and the zero line introduced, secondary coil L31 makes the magnetic core of zero sequence current mutual inductor L3 produce the coil of the constant current ac bias magnetic circuit of stabilizing magnetic field, secondary coil L32 makes the coil that produces faradic leakage current detection circuit for changing when zero sequence current mutual inductor magnetic field, when secondary coil L33 disconnects output for the earth leakage protective device that automatically resets, user side is carried out leak current fault whether remove the coil that continues detection; Under the normal power supply situation, when the electric current of live wire and zero line is identical, cancel each other in the magnetic field of live wire and zero line, on secondary coil L32, can not produce induced current, and when the electric current of live wire and zero line not simultaneously, just produce magnetic field, can produce induced current on secondary coil L32, this induced current will be controlled the earth leakage protective device that automatically resets and cut off power supply; Then under the control of logic control element IC8, by power supply L2 the output live wire is powered, when leakage current generating, just produce magnetic field on the secondary coil L33, thereby make on the secondary coil L32 and produce induced current, this induced current will continue to control the earth leakage protective device cut-out power supply that automatically resets; If the influence electricity miscarriage is given birth to, then restore electricity.
By VD1, VD2, D1 to D4, RP1, RP2, it is to make zero sequence current mutual inductor L3 that R1 to R4, V1, V2, elements such as C1, C2 form constant current ac bias magnetic circuit purpose, at leakage current hour, enters linear condition, to improve detection of electrical leakage sensitivity.
Form complete machine direct current supply voltage stabilizing circuit by transformer B, D4, IC1, C3, C4 and make circuit when AC supply voltage fluctuates, entire circuit can reliablely and stablely be worked.
By R5 to R22, RP3, RP4, D5, D6, C5 to C8, V3 to V7 forms the electric leakage signal linear amplifier circuit, to promote control circuit.Be that core is formed constant-current circuit wherein, absorbing the quiescent current of V5, thereby reach the purpose of zeroing with V6, V7.
By IC2 to IC6, RP5, R23 to R33, VD4, C9 to C14, V8 forms analog to digital conversion circuit, makes leakage current become digital signal by analog signal, so that show and carry out logic control.
By D7 to D11, R31, KSA-1 form permission leakage current prewired circuit and allow leakage current in order to select suitable maximum.
By D12, D13, D14, IC7, C15, R34 to R36, V9, V10, J1, J2 form detection of electrical leakage, cut off the power supply, send electric executive circuit.Under the circuit normal condition, the J2 adhesive, J1 discharges, under detected state, the J1 adhesive, J2 discharges.Wherein IC7, C15, V9 form the energy-saving circuit of J2, after the J2 adhesive, make its generation keep electric current, to reach minimum power consumption state.
Finish the complete machine logic control by logic control element.Concrete logical program is: relay J 1 adhesive, enter detection, and ifs circuit is normal, or in allowing maximum leakage current scope, then J1 discharges, and data latching shown in the display is delayed time by the internal monostable circuit then, after 5 to 10 seconds, 9 pin output high level, the V9 conducting makes the J2 adhesive by IC7, complete machine enters the leakage current that normally send electricity condition, display to begin to show current circuit.Ifs circuit exceeds the maximum leakage current that allows; then complete machine is in detected state always, after circuit enters normal or allowing within the maximum leakage current scope, delays time and send; the size of delay time is determined on a case-by-case basis, and is traditionally arranged to be 5 to 30 seconds and is advisable.After pressing stop button AN2, no matter whether line electrical leakage, all enters off-state, cuts off and send electricity, and display stops leakage current in the circuit constantly with demonstration simultaneously, and latchs; After pressing reset button AN1; complete machine is introduced into detection; if circuit is normal or within the scope that allows maximum leakage current; after time-delay; the J2 adhesive; enter and send electricity condition, if circuit is undesired or leakage current has exceeded the maximum leakage current of permission, then complete machine is in detected state always.
The utlity model has highly sensitive, outage rapidly, antijamming capability is strong, electric leakage is from motion tracking, the tripping operation back is detected automatically, automatically resets, leakage current adopts numeral to show that working stability is reliable, the electric leakage situation of whole circuit can come into plain view.
Claims (3)
1. earth leakage protective device automatically resets; comprise power circuit; leakage current detection circuit; the leakage current amplifying circuit; the leakage current indicating circuit; logic control element and control relay unit; it is characterized in that: described leakage current detection circuit comprises zero sequence current mutual inductor L3; described zero sequence current mutual inductor L3 is connected with the constant current ac bias magnetic circuit that the magnetic core that makes zero sequence current mutual inductor L3 produces stabilizing magnetic field; the primary coil of zero sequence current mutual inductor L3 for from the earth leakage protective device that automatically resets output live wire and the zero line introduced; the secondary coil L32 of zero sequence current mutual inductor L3 is connected with leakage current detection circuit; leakage current detection circuit is connected with the leakage current amplifying circuit; the leakage current amplifying circuit is connected with analog to digital conversion circuit; analog to digital conversion circuit is connected with logic control element with the leakage current indicating circuit, and logic control element is connected with leakage current detection circuit with the control relay unit.
2. the earth leakage protective device that automatically resets as claimed in claim 1; it is characterized in that: the described constant current ac bias magnetic circuit of the magnetic core generation stabilizing magnetic field of zero sequence current mutual inductor L3 that makes comprises voltage stabilizing didoe VD1; voltage stabilizing didoe VD2; diode D1; diode D2; bridge rectifier D3; potentiometer RP1; resistance R 1 is to resistance R 4 and triode V1; triode V2; voltage stabilizing didoe VD1; voltage stabilizing didoe VD2 forms the secondary AC voltage stabilizing circuit; diode D1; diode D2 forms temperature-compensation circuit; with triode V1; triode V2 is that core is formed current stabilization circuit, potentiometer RP2; capacitor C 1 is formed phase compensating circuit.
3. the earth leakage protective device that automatically resets as claimed in claim 1 or 2 is characterized in that: described control relay unit comprises capacitor C 15, bridge rectifier D 12, bridge rectifier D 13, photo-electric control module I C7, relay J 1, relay J 2; Wherein bridge rectifier D 12, D13 connect photo-electric control module I C7, and photo-electric control module I C7 connects relay J 2, and relay J 1 is controlled by logic control element IC8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053999 CN2728067Y (en) | 2004-09-20 | 2004-09-20 | Self-reset leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053999 CN2728067Y (en) | 2004-09-20 | 2004-09-20 | Self-reset leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2728067Y true CN2728067Y (en) | 2005-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420053999 Expired - Fee Related CN2728067Y (en) | 2004-09-20 | 2004-09-20 | Self-reset leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2728067Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970288A (en) * | 2015-09-15 | 2017-07-21 | 三垦电气株式会社 | Earth detector |
| CN112147403A (en) * | 2020-09-16 | 2020-12-29 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Method and system for improving temperature adaptability of residual current detection device |
-
2004
- 2004-09-20 CN CN 200420053999 patent/CN2728067Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970288A (en) * | 2015-09-15 | 2017-07-21 | 三垦电气株式会社 | Earth detector |
| CN112147403A (en) * | 2020-09-16 | 2020-12-29 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Method and system for improving temperature adaptability of residual current detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |