CN202395250U

CN202395250U - Ungrounded earth leakage protection plug

Info

Publication number: CN202395250U
Application number: CN2011205019133U
Authority: CN
Inventors: 曾肖锦; 胡志恒
Original assignee: Individual
Current assignee: Hu Zhiheng
Priority date: 2011-12-06
Filing date: 2011-12-06
Publication date: 2012-08-22
Anticipated expiration: 2021-12-06

Abstract

The utility model discloses an ungrounded earth leakage protection plug, comprising a plug housing, phase/zero/ground three-pole copper plug pins, a zero sequence current transformer arranged between a phase line and a zero line, a zero sequence current transformer arranged on a ground line, a test circuit, an amplification circuit, a free tripper, a silicon-controller rectifier, a dual comparator used for detecting leakage of the ground line, and a no-ground-line earth leakage protection circuit. The ungrounded earth leakage protection plug of the utility model has the beneficial effects that: when a user is ungrounded, if electric leakage occurs on an electrical product, and a leakage voltage value exceeds a human safe voltage value of 36V or exceeds a set voltage value, the earth leakage protection plug can normally break the three poles, so as to effectively protect the human body; when the user is well grounded, the ungrounded earth leakage protection plug has two protection ways as follows: (1) when a voltage value of the ground line exceeds the human safe voltage value of 36V or exceeds the set voltage value, the three poles break; and (2) when a leakage current value of the ground line is larger than 15mA or a set current value, the ungrounded earth leakage protection plug act to break the three poles; the two protection ways operate at the same time, thereby effectively putting an end to any electric leakage phenomena which bring damages to the human body.

Description

Absence-of-ground leakage protection plug

Technical field

The utility model relates to a kind of leakage protecting plug, and especially a kind of electrical network does not have ground connection or ground connection when undesired, the leakage protecting plug that leakage protecting plug still can operate as normal.And electrical network has ground connection, and ground connection just often has drain voltage to detect protection and leakage current detection protection duplicate protection.

Background technology

At present, the leakage protecting plug of selling on the market all requires the user when using installation, must have the good ground wire of ground connection.Do not have in use under the unusual situation of ground wire or ground connection, leakage protecting plug is failure to actuate, and does not have effective protection.Under the situation of no ground connection, if the electric equipment products electric leakage when causing product shell or associated fitting charged, can cause danger or constitute injury human body.But existing leakage protecting plug can not break off, and therefore can not play effective protective effect.

The utility model content

To the deficiency of above existing leakage protecting plug, the purpose of the utility model provides a kind of new type electric leakageproof plug product, and this leakage protecting plug can not have ground connection or ground connection when undesired when the household electrical network, and leakage protecting plug still can operate as normal.

Absence-of-ground leakage protection plug, comprise plug body and phase, zero, three utmost point copper insert, be located at the zero sequence current mutual inductor between the phase zero line; Zero sequence current mutual inductor on the ground wire, test loop, amplifying circuit; The trip free device, controllable silicon, and also be provided with no ground wire leakage protection circuit.When no ground wire or ground wire connect when bad, this leakage protecting plug still can operate as normal, when electrical leakage, when electrical leakage voltage surpassed 36V or set point, leakage protecting plug can break off by three utmost points, plays the effect of effective protection.

Optimal technical scheme as the utility model; Said leakage protection circuit is under the situation of no earth connection or circuit when electric leakage takes place; With electrical equipment feed back to current leakage protection circuit from the PE buttock line with institute is with voltage, make resistance (R16, R18, R20, R21) carry out the dividing potential drop sampling over the ground, the Vpe point magnitude of voltage that obtains of dividing potential drop over the ground is higher than the reference voltage level that comparator sets; Comparator output high level triggers controllable silicon, the earth leakage protective relay is threaded off protect.

As the optimal technical scheme of the utility model, said leakage protecting plug is externally under the electrical network ground connection good situations, plays ground wire electrification and presses and detect and the dual earth leakage protective of ground wire electrification stream detection; When ground wire ground connection just often, if leak electricity, body and socket ground wire form the loop; The electric current that is produced is through detecting through instrument transformer (L2); The reference voltage level that sets when the magnitude of voltage of instrument transformer (L2) output and comparator (U2A) relatively, as when being higher than with reference to point value, the high electricity of this comparator output triggers controllable silicon frequently and moves; Make the release action, three utmost points break off; When ground wire ground connection just often; If leak electricity, ground wire institute is with voltage to feed back to current leakage protection circuit, makes resistance (R16, R18, R20, R21) carry out the dividing potential drop sampling over the ground; The Vpe point magnitude of voltage that obtains of dividing potential drop over the ground is higher than the reference voltage level that comparator (U2B) sets; This comparator output high level triggers controllable silicon, the earth leakage protective relay is threaded off protect, and three utmost points break off.

Optimal technical scheme as the utility model; Said absence-of-ground leakage protective circuit is taked the dual comparator protective circuit; Be that drain voltage detects protective circuit and leakage current detects protective circuit; Said two groups of circuit separately and play a protective role simultaneously, thereby any one group all can be moved when reaching setting with reference to drain voltage or leakage current value and plays a protective role.

The beneficial effect of the utility model is: when the user does not have under the ground connection situation, if the electric equipment products electric leakage, when surpassing human safety voltage 36V or when surpassing the voltage of setting, leakage protecting plug can break off by normal three utmost points, plays the effective protective effect to human body.

Simultaneously, like user's ground connection when good, can play ground wire electrification and press and detect and the dual earth leakage protective of ground wire electrification stream detection.When ground wire ground connection just often, if leak electricity, electric conductor and socket ground wire form the loop; The electric current that is produced detects through instrument transformer L2; The reference voltage level that sets when the magnitude of voltage of instrument transformer L2 output and U2A comparator relatively, as when being higher than with reference to point value, the high electricity of comparator output triggers controllable silicon frequently and moves; Make the release action, three utmost points break off.

When ground wire ground connection just often; If leak electricity, ground wire electrification is pressed and is fed back to current leakage protection circuit, makes resistance R 16, R18, R20, R21 carry out the dividing potential drop sampling over the ground; The Vpe point magnitude of voltage that obtains of dividing potential drop over the ground is higher than the reference voltage level that comparator sets; Comparator U2B output high level triggers controllable silicon, the earth leakage protective relay is threaded off protect, and three utmost points break off.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model absence-of-ground leakage protection plug.

Embodiment

Be described further in the face of the utility model earth leakage protective plug down:

As shown in Figure 1, absence-of-ground leakage protection plug, comprise plug body and phase, zero, three utmost point copper insert; Be located at the zero sequence current mutual inductor between the phase zero line, the zero sequence current mutual inductor on the ground wire, test loop; Amplifying circuit; The trip free device, controllable silicon, and also be provided with no ground wire leakage protection circuit.When no ground wire or ground wire connect when good, this new type electric leakageproof plug still can operate as normal, when electrical leakage, when electrical leakage voltage surpassed 36V or set point, leakage protecting plug can break off by three utmost points, plays the effect of effective protection.

Do not have as the user under the situation of ground wire; When electric leakage takes place in electrical equipment; With electrical equipment feed back to current leakage protection circuit from the PE buttock line with institute is with voltage, make resistance R 16, R18, R20, R21 carry out the dividing potential drop sampling over the ground, the magnitude of voltage that Vpe point dividing potential drop over the ground obtains is higher than the reference voltage level that comparator sets; So comparator output high level triggers controllable silicon, makes the earth leakage protective relay thread off and protects.When ground connection was good, this leakage protecting plug can play effective earth leakage protective through two kinds of protected modes: one, when ground wire institute value with voltage surpassed 36V human safety voltage or setting voltage value, three utmost points broke off.Two, when ground wire leakance electric current>15mA or when setting current value, the leakage protecting plug action, three utmost points break off.Two kinds of protected modes work simultaneously, can effectively stop any leaky generation that human body is constituted injury.

Claims

1. absence-of-ground leakage protection plug, comprise plug body and phase, zero, three utmost point copper insert, be located at the zero sequence current mutual inductor between the phase zero line, the zero sequence current mutual inductor on the ground wire; The test loop, amplifying circuit, trip free device; Controllable silicon, the dual comparator to the ground wire detection of electrical leakage is characterized in that: said plug also is provided with the absence-of-ground leakage protective circuit; When no earth connection or ground wire are connected when bad, this leakage protecting plug still can operate as normal, when electrical leakage; When electrical leakage voltage surpassed 36V or set point, leakage protecting plug can break off by three utmost points, plays effective protective effect.

2. absence-of-ground leakage protection plug according to claim 1; It is characterized in that: said leakage protection circuit externally electrical network does not have when electric leakage takes place circuit under the situation of earth connection; With electrical equipment feed back to current leakage protection circuit from the PE buttock line with institute is with voltage; Make resistance (R16, R18, R20, R21) carry out dividing potential drop sampling over the ground, the Vpe point is when the magnitude of voltage that obtains of dividing potential drop is higher than the reference voltage level that comparator sets over the ground, and comparator output high level triggers controllable silicon; The earth leakage protective relay is threaded off protect, this setting reference voltage level is worth 36V or other arbitrary voltage setting value for the human safety voltage.

3. absence-of-ground leakage according to claim 1 protection plug is characterized in that: said leakage protecting plug is externally under the electrical network ground connection good situations, plays ground wire electrification and presses and detect and the dual earth leakage protective of ground wire electrification stream detection; When ground wire ground connection just often, if leak electricity, electric conductor and socket ground wire form the loop; The electric current that is produced is through detecting through instrument transformer (L2); The reference voltage level that sets when the magnitude of voltage of instrument transformer (L2) output and comparator (U2A) relatively, as when being higher than with reference to point value, the high electricity of this comparator output triggers controllable silicon frequently and moves; Make the release action, three utmost points break off; When ground wire ground connection just often, if leak electricity, ground wire institute is with voltage to feed back to current leakage protection circuit; Make resistance (R16, R18, R20, R21) carry out the dividing potential drop sampling over the ground; The Vpe point is when the magnitude of voltage that obtains of dividing potential drop is higher than the reference voltage level that comparator (U2B) sets over the ground, and this comparator output high level triggers controllable silicon, makes the protection of threading off of earth leakage protective relay; Three utmost points break off, and this setting reference voltage level is worth 36V or other arbitrary voltage setting value for the human safety voltage.

4. according to claim 2 or 3 described absence-of-ground leakage protection plugs; It is characterized in that: said absence-of-ground leakage protective circuit is taked the dual comparator protective circuit; Be that drain voltage detects protective circuit and leakage current detects protective circuit; Said two groups of circuit separately and play a protective role simultaneously, thereby any one group all can be moved when reaching setting with reference to drain voltage or leakage current value and plays a protective role.