CN202142839U - Voltage limited electric leakage protection switch - Google Patents

Abstract

The utility model discloses a voltage limited electric leakage protection switch, which relates to the electric filed. A zero-sequence current transformer is used for detecting leakage current, when the value of the leakage current is larger than or equal to that of action current, the leakage current is sent to an electronic amplifier by the zero-sequence current transformer; the leakage current is amplified by the electronic amplifier, and then the amplified leakage current is transmitted to an electric leakage tripping coil; the electric tripping coil acts to drive a tripping actuator to act; when the voltage of a voltage limited electromagnet is larger than or equal to the value of action voltage, the voltage limited electromagnet acts to drive the tripping actuator to act, and the tripping actuator disconnects a first switch and a second switch simultaneously. When electric leakage and electric shock occur, and the value of the current reaches to the action current value defined by the voltage limited electric leakage protection switch, a power supply is automatically disconnected to carry out protection; and when the voltage of the voltage limited electromagnet is larger than the service voltage of an electric apparatus by more than 10 percent, the power supply is disconnected, and the electric apparatus is protected. Due to the added overvoltage protection function of the conventional voltage limited electric leakage protection switch, the electric apparatus is prevented from being burnt out resulted from high voltage.

Description

A kind of limited pressure earth leakage circuit-breaker

Technical field

The utility model relates to electric field, particularly a kind of limited pressure earth leakage circuit-breaker.

Background technology

Electricity consumption when construction enterprises construct at the scene all is interim power supply, and especially the electricity consumption of site office electric equipment is 220V.Interim supply voltage is unstable, also because various artificial origin's voltages uprise, often burns power consumption equipment sometimes, for example: and computer, air-conditioning, printer and illuminating equipment etc., cause very big economic loss.

The utility model content

For fear of burning power consumption equipment, cause economic loss, the utility model provides a kind of limited pressure earth leakage circuit-breaker, sees hereinafter for details and describes:

A kind of limited pressure earth leakage circuit-breaker comprises: live wire, zero line, leak(age) test button and test resistance also comprise: first switch, second switch, zero sequence current mutual inductor, electron-amplifier, electric leakage tripping coil, pressure limiting electromagnet and dropout actuator,

One end of said live wire and said first switch links to each other, and the other end of said first switch links to each other with power consumption equipment; One end of said zero line and said second switch links to each other, and the other end of said second switch links to each other with said power consumption equipment, and said first switch and said second switch are closed; Said leak(age) test button is connected the back short circuit between said live wire and said zero line with said test resistance; Said zero sequence current mutual inductor detects leakage current; When said leakage current during more than or equal to the operating current value, said zero sequence current mutual inductor sends to said electron-amplifier with said leakage current; Said electron-amplifier amplifies said leakage current, and the leakage current after obtaining amplifying also is transferred to said electric leakage tripping coil; The action of said electric leakage tripping coil promotes the action of said dropout actuator; When the voltage of said pressure limiting electromagnet during, said pressure limiting electromagnet action, promote the action of said dropout actuator more than or equal to the operation voltage value; Said dropout actuator breaks off said first switch and said second switch simultaneously.

Said operation voltage value is 220 (1+10%) V.

The beneficial effect of the technical scheme that the utility model provides is:

The utility model provides a kind of limited pressure earth leakage circuit-breaker; The utility model is through being installed in the limited pressure earth leakage circuit-breaker in the low-voltage circuit; In when, electric leakage taking place and getting an electric shock when; And when reaching the operating current value that the limited pressure earth leakage circuit-breaker limited, with regard to immediately in the time that limits the action auto power off protect; Auto power off is protected when voltage surpasses electric equipment working voltage 10%, switch is protected in existing leakage added over-voltage protecting function, has avoided burning power consumption equipment, has reduced economic loss.

Description of drawings

The structural representation of a kind of limited pressure earth leakage circuit-breaker that Fig. 1 provides for the utility model.

The components listed tabulation is as follows in the accompanying drawing:

1: the first switch; 2: second switch;

3: the leak(age) test button; 4: zero sequence current mutual inductor;

5: electron-amplifier; 6: the electric leakage tripping coil;

7: the pressure limiting electromagnet; 8: dropout actuator;

9: power consumption equipment; 10: test resistance;

L: live wire; N: zero line.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model execution mode is done to describe in detail further below.

For fear of burning power consumption equipment, cause economic loss, the utility model embodiment provides a kind of limited pressure earth leakage circuit-breaker, referring to Fig. 1, sees hereinafter for details and describes:

A kind of limited pressure earth leakage circuit-breaker; Comprise: live wire L, zero line N, leak(age) test button 3 and test resistance 10; Also comprise: first switch 1, second switch 2, zero sequence current mutual inductor 4, electron-amplifier 5, electric leakage tripping coil 6, pressure limiting electromagnet 7 and dropout actuator 8

Live wire L links to each other with an end of first switch 1, and the other end of first switch 1 links to each other with power consumption equipment 9; One end of zero line N and second switch 2 links to each other, and the other end of second switch 2 links to each other with power consumption equipment 9, first switch 1 and second switch 2 closures; Leak(age) test button 3 is connected the back short circuit between live wire L and zero line N with a test resistance 10; Zero sequence current mutual inductor 4 detects leakage currents, and when leakage current during more than or equal to the operating current value, zero sequence current mutual inductor 4 sends to electron-amplifier 5 with leakage current; 5 pairs of leakage currents of electron-amplifier amplify, and the leakage current after obtaining amplifying also is transferred to electric leakage tripping coil 6; 6 actions of electric leakage tripping coil promote 8 actions of dropout actuator; When the voltage of pressure limiting electromagnet 7 during more than or equal to the operation voltage value, 7 actions of pressure limiting electromagnet promote 8 actions of dropout actuator; Dropout actuator 8 breaks off first switch 1 with second switch 2 simultaneously.

Wherein, the operating current value is set according to the needs in the practical application, and when specifically realizing, the utility model embodiment does not limit this.

Wherein, in order to satisfy the extensive needs in the practical application, the operation voltage value is preferably 220 (1+10%) V.

Wherein, short circuit was used for the limited pressure earth leakage circuit-breaker is carried out self check between live wire L and zero line N after leak(age) test button 3 was connected with a test resistance 10, had improved fail safe.

When the voltage of pressure limiting electromagnet 7 during more than or equal to electrical voltage (AC220V) 10%, first switch 1 and second switch 2 automatic disconnections protected power consumption equipment 9; When power supply produced electric leakage or electric shock situation, first switch 1 and second switch 2 automatic disconnections protected power consumption equipment 9.

In sum; The utility model embodiment provides a kind of limited pressure earth leakage circuit-breaker; The utility model embodiment is through being installed in the limited pressure earth leakage circuit-breaker in the low-voltage circuit; When electric leakage taking place and get an electric shock, and when reaching the operating current value that the limited pressure earth leakage circuit-breaker limited, the auto power off that just in the time that limits, moves is immediately protected; When the voltage of pressure limiting electromagnet during more than or equal to the operation voltage value auto power off protect, switch is protected in existing leakage has been added over-voltage protecting function, avoided burning power consumption equipment, reduced economic loss.

It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, above-mentioned the utility model embodiment sequence number is not represented the quality of embodiment just to description.

The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the utility model.

Claims (2)

1. limited pressure earth leakage circuit-breaker; Comprise: live wire, zero line, leak(age) test button and test resistance; It is characterized in that, also comprise: first switch, second switch, zero sequence current mutual inductor, electron-amplifier, electric leakage tripping coil, pressure limiting electromagnet and dropout actuator

One end of said live wire and said first switch links to each other, and the other end of said first switch links to each other with power consumption equipment; One end of said zero line and said second switch links to each other, and the other end of said second switch links to each other with said power consumption equipment, and said first switch and said second switch are closed; Said leak(age) test button is connected the back short circuit between said live wire and said zero line with said test resistance; Said zero sequence current mutual inductor detects leakage current; When said leakage current during more than or equal to the operating current value, said zero sequence current mutual inductor sends to said electron-amplifier with said leakage current; Said electron-amplifier amplifies said leakage current, and the leakage current after obtaining amplifying also is transferred to said electric leakage tripping coil; The action of said electric leakage tripping coil promotes the action of said dropout actuator; When the voltage of said pressure limiting electromagnet during, said pressure limiting electromagnet action, promote the action of said dropout actuator more than or equal to the operation voltage value; Said dropout actuator breaks off said first switch and said second switch simultaneously.

2. a kind of limited pressure earth leakage circuit-breaker according to claim 1 is characterized in that, said operation voltage value is 220 (1+10%) V.

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