CN2041452U - Safety protection socket for electric leakage - Google Patents

Abstract

The utility model discloses a novel safety protection socket which has the electrical shock protection, the electric casing electrical leakage protection and the phasing protection. The novel safety protection socket mainly directly adopts a micro-trigger thyristor as a sensitive element for leakage current and residual current, and the circuit doesn't need other amplifying devices. The novel safety protection socket has the advantages of high reliability, low cost and good socket compatibility, so the novel safety protection socket can be used for occasions such as the school, the hospital and the family.

Description

Safety protection socket for electric leakage

The utility model is a kind of band electric shock (electric leakage) protection, electric appliance casing earth leakage protective, distinguishes protection mutually, integrates the novel protected electrical equipment that is protected in socket,

In view of China's national situation; house power distribution generally is not provided with special-purpose protection ground wire, still continues to use " fire " " zero " supply power mode in the past, and supply socket two is extremely in the majority in resident's residence; electric appliance casing can not connect with having, and this present situation requires the appearance of new protected mode undoubtedly.In addition, existing earth leakage circuit-breaker (comprising earth leakage protector) can only be to getting an electric shock and Leaked Current of Line to Ground respond, under considerable situation, be with the charged position that the people touches power supply or electrical equipment cause just execute after the electric shock fact to protect; When the electrical apparatus insulation fault causes outer casing electrification, and electric appliance casing also is failure to actuate even be connected to leakage switch in the circuit when over the ground good insulation being arranged (as being lined with plank, plastic plate, hair matter or eyeball synthetic fibre carpet etc.).

The purpose of this utility model provides a kind of except that (electric leakage) protection of getting an electric shock, and can also monitor the protected mode of electric appliance metal outer casing electrification, to remedy the deficiency of common leakage switch.In the electrical equipment use; when insulation resistance descends; (be equivalent to 220 volts of following insulation resistances of rated voltage and be lower than 0.5 megohm) when causing leakage current to surpass 0.44 millimeter; this earth leakage protective safety socket will cut off power supply automatically; further worsen to prevent to insulate, reach the purpose of protection electric equipment and personal safety.

The purpose of this utility model is finished as follows:

1, adopt little triggering thyristor directly as the sense photosensitive elements of leakage current and aftercurrent, because high (the nominal value V of little triggering thyristor trigger sensitivity _GT=0.8 ^V, I _GT=0.25mA), so that need not other amplifying device in the circuit, circuit is comparatively succinct, reliable.

2, be provided with relatively independent current mode get an electric shock (electric leakage) protection circuit, shell leakage current protection circuit, " fire ", " zero " are distinguished that the arbitrary fault in phase circuit, the pulse delay circuit all can make protector move.

Wiring and establish earth connection in addition voluntarily when 3, the utility model uses promptly can be the electric equipment that residence powers power supply and protection is provided as long as its two utmost point attaching plugs are inserted, than using commercially available leakage switch will make things convenient for manyly in the standing supply socket.

4, the utility model profile is a strip, is of a size of 342 * 53 * 45mm ³Be provided with one of two pole socket, two of oblique three pole sockets, one of straight three pole socket are to realize reaching the compatibility of new and old electrical equipment both at home and abroad; Electric power incoming line is not had the old electrical equipment that the body contact end is protected, one of body contact binding post is provided.

5, the operating voltage that the utility model was suitable for is single-phase 220 volts, and the load maximum operating currenbt is 7.5 peaces (Cos φ=1 o'clock).

The utility model can be avoided effectively owing to electric leakage, the caused accident of outer casing electrification; electric equipment and personal safety all there is good protective action; the utility model is functional strong, and easy to use, low cost of manufacture can be widely used in places such as school, hospital, family.

Shown in Figure 1 is electrical schematic diagram of the present utility model.

Below in conjunction with Fig. 1 the utility model is described in further detail:

In the electric operation process, when insulation resistance descends, leakage current will flow to N along the E utmost point, resistance 2, the resistance 3 of socket 1, along with leakage current increases to certain value (about 0.44 milliampere), resistance 3 two ends pressure drops will increase, and make diode 4 conductings, thyristor 6 triggering and conducting.

Because the conducting of thyristor 6 makes relay 8 adhesives, making contact 11 on the one hand is open mode from closure state, cuts off the socket power supply; Make contact 12 actions on the one hand, relay is converted to automatically to exchange from the direct current adhesive and keeps, and further reduces the power consumption of relay.

When electric shock accidents or Leaked Current of Line to Ground take place, current transformer 13 will produce induced potential and electric current at secondary, and this electromotive force is less, need to remove to trigger little triggering thyristor 6 by the stack of presetting the direct voltage that direct voltage output potential device 22 takes out.

When inlet wire two utmost point attaching plugs of this earth leakage protective safety socket and power supply " fire ", " zero " when the position is wrong, direct-to-ground capacitance of its shell and resistance R 17, resistance R 16 just constitute the loop with power supply L end, utilize the pressure drop of loop current on resistance R 16, just be enough to make thyristor 6 to trigger, make the power supply locking; The next little triggering thyristor of normal condition will not trigger.

Above-mentioned many circuit are all considered action delay, by resistance 2, electric capacity 5; Resistance 17, electric capacity 5; Resistance 15, electric capacity 5 are formed rc-delay circuit, and its time limit also can strengthen when needing in 10～15mS scope.

Be the reliability of safety action, by button 19, resistance 20, current transformer 13, diode 14, resistance 15, little triggering thyristor 6 compositions are checked oneself circuit, just often press the button 19, and relay 8 should move, LED luminous tube 10 is luminous; Press reset button 7 then, then relay should discharge, and LED luminous tube 10 extinguishes.This self-checking circuit is made regular check on usefulness for the user.

When the electric power incoming line of the electrical equipment (as usual electrical equipment) that uses is two utmost points; when no body contact is protected the utmost point; plug can be inserted in two pole sockets of this earth leakage protective safety socket; protect binding post 21 to link to each other with the body contact on the safety socket electric appliance casing with lead in addition, can obtain equally the earth leakage protective function of shell.

Claims (1)

1, a kind of earth leakage protective safety socket is made up of leakage switch, socket, it is characterized in that:

A, the little triggering thyristor 6 of sense photosensitive elements that has a conduct to protect;

B, be electrically connected, constitute shell earth leakage protective by resistance 2, resistance 3, diode 4, electric capacity 5, little triggering thyristor 6;

C, be electrically connected, constitute and distinguish protection mutually by resistance 16, resistance 17, diode 18, electric capacity 5, little triggering thyristor 6;

D, be electrically connected, constitute self-hold circuit by resistance 9, relay 8, contact 12, little triggering thyristor 6;

E, form socket row by oblique three utmost points, straight three utmost points, two pole sockets;

F, body contact earth leakage protective contact pin 21, fast acting fuse, test button 19, reset button 7, fault show that light-emitting diode 10 is separately fixed on end and the panel.