CN202231406U - Earth leakage protection device with earth wire electrified protection function - Google Patents
Earth leakage protection device with earth wire electrified protection function Download PDFInfo
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- CN202231406U CN202231406U CN2011203573863U CN201120357386U CN202231406U CN 202231406 U CN202231406 U CN 202231406U CN 2011203573863 U CN2011203573863 U CN 2011203573863U CN 201120357386 U CN201120357386 U CN 201120357386U CN 202231406 U CN202231406 U CN 202231406U
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Abstract
The utility model relates to an earth leakage protection device with earth wire electrified protection function, belonging to the technical field of the electric appliances. The earth leakage protection device comprises a residual current detection device, a circuit breaking device and an operation test device, wherein the residual current detection device comprises a zero sequence current transformer, a primary winding of the zero sequence current transformer is composed of a power supply phase wire, a zero wire and an earth wire; a second winding of the zero sequence current transformer is connected with the circuit breaking device, the circuit breaking device is connected with the power supply phase wire and the zero wire; the operation test device is formed by connecting a current limiting resistor with a test button in series, one end of the operation test device is connected with the power supply phase wire and the zero wire before the zero sequence current transformer another end is connected with the power supply zero wire or phase wire behind the zero sequence current transformer. The earth leakage protection device has advantages: simple and reliable circuit, low cost, capability of reliably protecting various electric leakage, electric shock situations, especially performs the earth leakage protection when the earth wire is electrified.
Description
Technical field
The utility model belongs to the electrical appliance technical field; Be specifically related to a kind of earth leakage protective device with earth strap electric protection function; It also can play earth leakage protective function when the earth connection of electrical appliance power supply is charged except the defencive function that can realize common earth leakage protective device
Background technology
current common electrical appliance earth leakage protective device roughly can be divided into two big types by operation principle: the earth leakage protective device that detects based on residual current between phase line, zero line and based on the earth leakage protective device of electrical appliance earth strap electro-detection.
The earth leakage protective device that
are detected based on residual current between phase line, zero line uses zero sequence current mutual inductor to detect the residual current between phase line, zero line; Through amplifier amplifying signal rear drive or the mode of using senser directly to drive, driving common is basic circuit breaker with the electromagnet again.Cause producing current circuit between electrical appliance phase line and the earth when human electric shock's situation takes place electrical appliance; When perhaps producing current circuit because of leak current fault between the phase line of electrical appliance and the earth connection; Residual current will occur between the phase line of electrical appliance power circuit, the zero line, when this residual electricity flow valuve reached the earth leakage protective device preset threshold, the circuit breaker of earth leakage protective device will move; Break off the power circuit of electrical appliance, thereby the protection human body exempts from the injury of getting an electric shock.But; When the power end of electrical appliance because external cabling mistake or other reasons when causing the earth connection of power end charged; Therefore the grounding system of electrical appliance will be and passive charged; If at this moment human body touch on the electrical appliance normally should ground connection position (like shell etc.), the charged earth connection that will produce electrical appliance through human body so causes electric shock accidents to the current circuit between the earth.
are then different with the earth leakage protective device that detects based on residual current between phase line, the zero line based on the earth leakage protective device of electrical appliance earth strap electro-detection, and it uses the voltage between detection device earth connection and zero-power line to judge whether the earth connection of electrical appliance is charged.When causing the electrical appliance earth connection charged because of leak current fault or because of the external power source problem between the phase line of electrical appliance and the earth connection; Earth leakage protective device just can detect the voltage that exists between electrical appliance earth connection and the zero-power line; This voltage is direct or after processing and amplifying, be used to the drive circuit disconnecting apparatus, avoids electrical appliance to bring the injury of getting an electric shock because of leak current fault to human body.This earth leakage protective device at the power end of electrical appliance because external cabling mistake or other reasons when causing the earth connection of power end charged, can break off the electrical appliance power supply reliably, but such earth leakage protective device also exist serious problem.Usually the circuit breaker of this type earth leakage protective device is not equipped with the break function of earth connection; Therefore; When the problem of (leaking electricity between external cause but not the inner phase line of electrical appliance, earth connection) because power end when electrical appliance causes grounding system charged; The outside that the circuit off action of earth leakage protective device can not be broken off the electrical appliance earth connection connects, thus can't make the contact electrical appliance should earthing position the personnel of (like shell etc.) avoid corresponding electric shock accidents.In addition; When human body touches the phase line on the electrical appliance because of accidental cause; Or imperfect earth but when having electric leakage situation regional with phase line, the entire circuit system the leaky that this earth leakage protective device is protected can not occur on the electrical appliance, earth leakage protective device can not move yet; At this moment, electric shock accidents still can take place in party person.
are except above two kinds of common earth leakage protective devices; Also there is mechanism's butt joint ground wire electrification problem to carry out some researchs; Like Chinese patent CN01129867.7 and Chinese patent CN201020662937.2, these two patents disclose a kind of all-purpose leakage protection plug that the ground wire electrified detection ability is kept watch on that has.This earth leakage protective device can detect because the power supply residual current that human body contact electrical appliance phase line is got an electric shock and caused also can detect because of the charged situation of power end earth connection, can avoid polytype electric leakage, electric shock accidents.But; Such earth leakage protective device has used two current transformers; And need test or monitoring arrangement be set respectively to common earth leakage protective and the charged situation of earth connection, cause the cost of earth leakage protective device to increase, and owing to had more a current transformer and a test circuit by the conventional earth leakage protective device that detects based on residual current; Make whole earth leakage protective device become more complicated, brought certain influence also for the reliability of earth leakage protective device.
In view of above-mentioned prior art, be necessary existing electrical appliance earth leakage protective device is improved, for this reason, the applicant has carried out good try, has found the way that solves the problems of the technologies described above, and the technical scheme that will introduce below produces under this background
Summary of the invention
The task of
the utility model is that a kind of earth leakage protective device with earth strap electric protection function will be provided; It can protect human body to avoid causing electric shock accidents because of touching the electric leakage of electrical appliance phase line or electrical appliance; Also can the power end earth connection because of external error or other reason avoid when charged human body because of touch on the electrical appliance should ground connection the position electric shock accidents takes place, various electric leakages, electric shock situation are all made reliably protecting.
The task of
the utility model is accomplished like this; A kind of earth leakage protective device with earth strap electric protection function; Be characterized in: comprise residual current detection device, circuit breaker and motion test device; Described residual current detection device is realized by a zero sequence current mutual inductor; Its elementary winding is made up of power supply phase line, zero line and earth connection jointly, and wherein power supply phase line, zero line be with identical direction and identical number of turns coiling, and earth connection is then with direction opposite with power supply phase line, zero line and identical or close number of turns coiling; The secondary winding of described zero sequence current mutual inductor is connected to circuit breaker as its action triggers signal; Described circuit breaker is connected with zero line to obtain working power with the power supply phase line; The all phase line of deenergization, zero line and earth connection during action keep break function when having outage simultaneously; Described motion test device is connected in series by a current-limiting resistance and a testing button and forms, and the one of which end is connected to power supply phase line or the zero line before the zero sequence current mutual inductor, and the other end is connected to zero-power line or the phase line after the zero sequence current mutual inductor.
are in a specific embodiment of the utility model; The secondary winding of described zero sequence current mutual inductor has been connected resistance R 1 and parallel connection respectively before being connected to circuit breaker resistance R 2; Wherein an end of resistance R 1 is connected with an end of zero sequence current mutual inductor secondary winding; The other end of resistance R 1 is connected with circuit breaker; One end of resistance R 2 is connected with the tie point of circuit breaker with resistance R 1, and the other end of resistance R 2 is connected with the tie point of circuit breaker with the other end of zero sequence current mutual inductor secondary winding.
The technical scheme of
the utility model is owing to only use a current sensing means and a motion test device; Just realized the required various possible electric leakage that possesses of earth leakage protective device, electrical shock protection function and complete motion test function, circuit is simple and reliable.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of the utility model.
Fig. 2 is the schematic diagram of another embodiment of the utility model.
Embodiment
Specifically describe the course of action of electrical appliance earth leakage protective device under the various electric leakages that possibly damage, contact situation below to human body; Suppose that the elementary earth connection winding turns of zero sequence current mutual inductor is identical with the winding turns of phase line, zero line, the elementary residual electricity flow valuve of instrument transformer that the action of earth leakage protective device circuit breaker sets is I
Δ
, the permeance of this residual electricity flow valuve and the elementary number of turns, instrument transformer permeability magnetic material and the trigger characteristic of circuit breaker are confirmed the secondary winding turns of zero sequence current mutual inductor jointly.
first kind of situation, the electrical appliance power end connects normal, power supply phase line, zero line normal power supply, the normal ground connection of power ground line.When there are the electric leakage situation in phase line, the earth connection of electrical appliance; If this leakage current is I; Because the elementary phase line of the zero sequence current mutual inductor of earth leakage protective device is opposite with the number of turns equidirectional of earth connection; Its elementary equivalent residual current will reach 2I, when the 2I value reaches circuit breaker specified action residual current I
Δ
, this circuit breaker will move, and uses phase line, zero line, the earth connection of appliances power source all to break off.
second kind of situation, the electrical appliance power end connects normal, power supply phase line, zero line normal power supply, the normal ground connection of power ground line or unearthed.There are not the electric leakage situation in the phase line of electrical appliance, earth connection, the electrical appliance operate as normal.When zero line and earth connection, human body can not produce influential reaction on touching electrical appliance.On touching electrical appliance during phase line; Will constitute current circuit (do not have electric current in the power ground line this moment) through human body between power supply phase line and the earth; If this electric current is I; Then the elementary residual current of zero sequence current mutual inductor will be similarly I, when this current value I reaches circuit breaker specified action residual current I
Δ
The time, this circuit breaker will move, and uses phase line, zero line and the earth connection of appliances power source all to break off.
the third situation, the electrical appliance power end connects unusual, power supply phase line, zero line normal power supply, the power ground line is charged unusually because of outside connection error or other reasons.When having the electric leakage situation between phase line on the electrical appliance and the earth connection or between zero line and the earth connection, first kind of situation analysis of above.When between phase line on the electrical appliance and the earth connection, when not having the electric leakage situation between zero line and the earth connection, electrical appliance can operate as normal.Touch phase line on the electrical appliance like human body, second kind of situation analysis of above this moment; When touching earth connection; Because earth connection is charged on the electrical appliance at this moment; Will constitute current circuit through human body between this earth connection and the earth; If this electric current is I, then the elementary residual current of zero sequence current mutual inductor will be similarly I, when this current value I reaches circuit breaker specified action residual current I
Δ
, this circuit breaker will move, and uses phase line, zero line and the earth connection of appliances power source all to break off.
Under the general situation; Except directly being connected the special circumstances between phase line of power and the zero line; Human body touches on the electrical appliance live part to be caused getting an electric shock and all constitutes the shock current loop between this alive circuit and the earth because of human body is in; Because elementary power ground line and the phase line zero line of zero sequence current mutual inductor oppositely winds the line; Electric current in this electric shock circuit always can be at the elementary formation residual current of zero sequence current mutual inductor (see second with the analysis of the third situation), when this electric current reaches circuit operation device specified action residual current I
Δ
, this circuit breaker will move, and uses phase line, zero line and the earth connection of appliances power source all to break off, thereby from avoiding the generation of electric shock accidents to the full extent.
motion test device is for use in testing for the reliable in action property of specifying circuit breaker under the residual current condition, and the current-limiting resistance in the motion test device circuit calculates according to the residual electricity flow valuve of voltage between power supply phase line, zero line and regulation and obtains.When pressing testing button; The electric current that will occur expected design in the motion test device circuit; The circuit of describing according to the front constitutes, and obviously this electric current is detectable residual current fully concerning zero sequence current mutual inductor, and this moment can action message like circuit breaker; Corresponding electric leakage, electric shock situation when taking place in earth leakage protective device so, and certainty also can action message.
provide two kinds of embodiments of the utility model below in order more clearly to describe the technical spirit and the effect of the utility model.
Embodiment 1:
see also Fig. 1; Phase line of power L, zero line N and earth connection G on the zero sequence current mutual inductor 1 as elementary winding; Wherein the direction of winding of phase line L and zero line N is all identical with winding turns; The direction of winding of the direction of winding of earth connection G and phase line L and zero line N is opposite and winding turns is identical, and power supply phase line L, zero line N and earth connection G are connected to electrical appliance 4 behind zero sequence current mutual inductor 1 elementary winding.The secondary winding lead-out wire of zero sequence current mutual inductor 1 is connected to circuit breaker 3 as its triggering signal, whole being connected of deenergization phase line L, zero line N and earth connection G and electrical appliance 4 during circuit breaker 3 action.Circuit breaker 3 is connected to power supply phase line L and zero line N simultaneously, to obtain the power supply of circuit breaker.When various electric shocks or electric leakage situation appear in electrical appliance 4; According to top analysis; Corresponding residual current will appear in the elementary winding of zero sequence current mutual inductor 1, through the number of turns of design zero sequence current mutual inductor 1 secondary winding and the adjusting of circuit breaker, in the time of can making zero sequence current mutual inductor 1 elementary winding the residual current of regulation occur; The signal that its secondary winding occurs just can the action of circuits for triggering disconnecting apparatus, thereby all cuts off the electricity supply and being connected of electrical appliance.The motion test device is connected in series by a current-limiting resistance R and a testing button PB and forms, and the one of which end is connected to power supply phase line or the zero line before the zero sequence current mutual inductor 1, and the other end is connected to zero-power line or the phase line after the zero sequence current mutual inductor 1.
Embodiment 2:
see also Fig. 2, and this embodiment serves as that the basis constitutes with first kind of embodiment.This embodiment compares with first kind of embodiment; Before the secondary winding of zero sequence current mutual inductor 1 is connected to circuit breaker 3; The resistance R of having connected respectively 1 with parallel connection resistance R 2, wherein an end of resistance R 1 is connected with an end of zero sequence current mutual inductor 1, the other end of resistance R 1 is connected with circuit breaker 3; The two ends of resistance R 2 all are connected with circuit breaker 3, are used for the susceptibility of 3 pairs of zero sequence circuit of regulating circuit disconnecting apparatus instrument transformer, 1 secondary winding output signal.Wherein the resistance of R1 may diminish to zero, and is promptly straight-through; The resistance of R2 can be very big, until breaking off (being equivalent to infinity).In actual production, because the needed signal strength signal intensity of action of circuit breaker has certain dispersion, the corresponding selection through R1, R2 can make the performance of earth leakage protective device reach consistent basically.
Listed the use-case of the utility model at single phase circuit above
, but the utility model does not receive the restriction of single phase circuit, the utility model is suitable for for three-phase circuit too.When the phase line indication in each embodiment was whole triple line of three phase mains, all discussed same the establishment front of the utility model.Simultaneously, when the three-phase electrical appliance used phase three-wire three connected mode and earth connection, all discussed establishment equally after using the three-phase phase line to substitute phase line and zero line the front of the utility model.These all should be regarded as the equivalent transformation of the utility model.
In sum, the technical scheme that the utility model provides has remedied the shortcoming in the prior art, has reached goal of the invention, has embodied non-obvious technique effect
Claims (2)
1.
A kind of earth leakage protective device with earth strap electric protection function; It is characterized in that: comprise residual current detection device, circuit breaker and motion test device; Described residual current detection device is realized by a zero sequence current mutual inductor; Its elementary winding is made up of power supply phase line, zero line and earth connection jointly, and wherein power supply phase line, zero line be with identical direction and identical number of turns coiling, and earth connection is then with direction opposite with power supply phase line, zero line and identical or close number of turns coiling; The secondary winding of described zero sequence current mutual inductor is connected to circuit breaker as its action triggers signal; Described circuit breaker is connected with zero line to obtain working power with the power supply phase line; The all phase line of deenergization, zero line and earth connection during action keep break function when having outage simultaneously; Described motion test device is connected in series by a current-limiting resistance and a testing button and forms, and the one of which end is connected to power supply phase line or the zero line before the zero sequence current mutual inductor, and the other end is connected to zero-power line or the phase line after the zero sequence current mutual inductor
2.
A kind of earth leakage protective device according to claim 1 with earth strap electric protection function; The secondary winding that it is characterized in that described zero sequence current mutual inductor before being connected to circuit breaker, connected respectively resistance R 1 with parallel connection resistance R 2; Wherein an end of resistance R 1 is connected with an end of zero sequence current mutual inductor secondary winding; The other end of resistance R 1 is connected with circuit breaker; One end of resistance R 2 is connected with the tie point of circuit breaker with resistance R 1, and the other end of resistance R 2 is connected with the tie point of circuit breaker with the other end of zero sequence current mutual inductor secondary winding
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203573863U CN202231406U (en) | 2011-09-22 | 2011-09-22 | Earth leakage protection device with earth wire electrified protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203573863U CN202231406U (en) | 2011-09-22 | 2011-09-22 | Earth leakage protection device with earth wire electrified protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231406U true CN202231406U (en) | 2012-05-23 |
Family
ID=46081980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203573863U Withdrawn - After Issue CN202231406U (en) | 2011-09-22 | 2011-09-22 | Earth leakage protection device with earth wire electrified protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231406U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354947A (en) * | 2011-09-22 | 2012-02-15 | 常熟市天银机电股份有限公司 | Leakage protection device with protection function in case of live grounding wire |
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
| CN104466942A (en) * | 2014-12-11 | 2015-03-25 | 乐清市中贸智能科技有限公司 | Electricity leakage protection circuit |
| CN108469550A (en) * | 2017-02-23 | 2018-08-31 | 西门子公司 | Device and method for the ground lead resistance for determining charging unit |
-
2011
- 2011-09-22 CN CN2011203573863U patent/CN202231406U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354947A (en) * | 2011-09-22 | 2012-02-15 | 常熟市天银机电股份有限公司 | Leakage protection device with protection function in case of live grounding wire |
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
| CN104466942A (en) * | 2014-12-11 | 2015-03-25 | 乐清市中贸智能科技有限公司 | Electricity leakage protection circuit |
| CN104466942B (en) * | 2014-12-11 | 2018-02-09 | 浙江中富电气有限公司 | A kind of leakage protection circuit |
| CN108469550A (en) * | 2017-02-23 | 2018-08-31 | 西门子公司 | Device and method for the ground lead resistance for determining charging unit |
| CN108469550B (en) * | 2017-02-23 | 2021-04-16 | 西门子公司 | Device and method for determining the resistance of the ground line of a charging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120523 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |