CN2662517Y - Special purpose leakage protector with omnibearing protection function for electric water heater - Google Patents

Abstract

The utility model relates to an all-round creepage and turnoff protector specially used in an electric water heater; the protector comprises a plurality of zero sequence current instrument transformers, a control circuit and a trip relay, and is characterized in that: at least a zero sequence current instrument transformer (Y1) is sleeved at the inlet pipe or the outlet pipe of the electric water heater; the null line (N) and the live wire (L) drill through the other zero sequence instrument transformer (Y2) at the same time; the working power supply of the trip relay and the control circuit are arranged at the null line (N) and the live wire (L) outside the touch spot of the trip relay. The trip relay is connected in series with the power supply null line (N) and the inlet wire of the live wire (L) by a polar trip relay (J2), and is connected in series with the earth wire (E) by one pole of a two-pole normally closed relay (J3) and with the coil circuit of the (J2) relay by the other pole. When the protective earth wire of the power supply is not well earthed, the electrical heat tube breaks or the live wire (L) and the earth wire (E) of the power supply are short-circuited, which causes the case of the water heater to contact human bodies and the creepage, the currents drilling through the zero sequence current instrument transformers do not balance, and the zero sequence instrument transformers output the current signal, then the signal passes the control circuit (IC1), springs the controlled silicon (S2) and (S1) and controls the trip relay (J2) and the relay (J3) to cut off the electricity. The creepage protector can provide an all-round creepage and turnoff protection to two-sided creepage such as the ubiquitous creepage phenomenon caused by being failed to connect circuits by people and the electric appliance creepage.

Description

The earth leakage protective device with omnibearing protection function of electric heater special use

Technical field: the utility model relates to a kind of earth leakage protective device with comprehensive creepage protection function of electric heater special use.

Background technology: electric heater enjoys people's favor in recent years as a kind of household appliances.Electric heater belongs to the I electric appliances, is necessary for the protection ground wire that it is provided with a special use during installation.When having good earth connection and plug to contact with socket in user's three utmost point supply sockets and being under the good situation, it is very safe that electric heater uses.But according to market survey, at present do not have good earth connection on China has many consumers the supply socket of installing, some running water pipe is used as ground wire, and some is in vacant state, some in addition the ground wire utmost point of socket is connected on the zero line or live wire of power supply.Like this, the user just exists the hidden danger that is absolutely unsafe when using electric heater.Particularly the ground wire utmost point of supply socket is attempted by on the live wire, and at this moment the shell of electric heater is just directly charged, and the user just has the danger of direct electric shock.Also have the ground wire utmost point of supply socket to be attempted by on the zero line and also be absolutely unsafe, just in case during the outdoor electricity distribution line maintenance with live wire and zero line exchange, the shell of electric heater is also just directly charged so.If moreover do not press the standard-required wiring during water heater wiring, with ground wire and zero line misconnection, ground wire and live wire misconnection all can cause Danger Electric shock risk.According to investigations, at present the annual electric heater that uses of China occurs repeatedly because of socket ground wire utmost point misconnection or the accident of getting an electric shock and dying that do not have good earth to cause, and in rising trend.In order to prevent that electric heater from the electric leakage situation in use taking place; residual current circuit breaker has also been installed additional for water heater in a lot of water heater producers; but at present in the world all various residual current circuit breaker all can only to electrical appliance itself leaked electricity the tripping operation protective effect, then can not shield to the caused leaky of power supply wiring mistake.

Summary of the invention: the purpose of this utility model just provides and a kind ofly all can provide earth leakage protective earth leakage protective device at above ubiquitous people for causing circuit misconnection leaky and electric heater self electric leakage.

To achieve these goals; the utility model is taked following technical solution: 6. the earth leakage protective device with comprehensive creepage protection function of electric heater special use comprises zero sequence current mutual inductor, control circuit; tripping relay; it is characterized in that: have at least a zero sequence current mutual inductor (Y1) 7. be set in electric heater water inlet pipe 1. 3. or outlet pipe 4. go up; zero line (N) and live wire (L) pass another zero-sequence transformer (Y2) simultaneously, and the working power of tripping relay and control circuit is on the zero line (N) and live wire (L) in the outside, tripping relay contact.Described tripping relay is serially connected on zero-power line (N) and live wire (L) inlet wire by the tripping relay (J2) at the two poles of the earth, utmost point by the two poles of the earth normally closed relay (J3) is serially connected in (E) on the earth connection, and another utmost point is serially connected on the control coil of (J2) relay; When there not being good earth, 5. electrothermal tube self breaks or power firestreak (L) and ground wire (E) short circuit, cause when 2. the water heater metal inner tube contacts electric leakage with the shell that links to each other with human body, pass zero sequence current mutual inductor (Y1) or current imbalance (Y2), zero-sequence transformer just has current signal output, this signal triggers controllable silicon (S2) (S1) behind control circuit (IC1), control tripping relay (J2) and relay (J3) outage.

The following compared with prior art beneficial effect of the utility model:

When supply socket does not have effective grounding and the socket ground wire utmost point (E) and live wire (L) and connects and make outer cover of water heater charged, when constituting power circuit generation electric leakage with human body, current transformer (Y1) 7. has signal output, handle through control circuit (IC1), control relay contact (J2), (J3) disconnect, cut off power supply and dangerous earth electrode (E), play the safeguard protection effect; When power supply self has electric leakage or electric heater that electric leakage is arranged; the source current turnover of passing zero-sequence transformer (Y2) is uneven; zero-sequence transformer (Y2) has signal output; handle through control circuit (IC1); control relay contact (J2); (J3) disconnect, cut off power supply, play the safeguard protection effect.Omnibearing leakage, breaking protection is provided.

Below in conjunction with accompanying drawing the utility model is further described, and provides enforcement simultaneously.

Description of drawings:

Accompanying drawing 1: be the circuit theory diagrams of the utility model enforcement

Accompanying drawing 2: for utility model is used winding diagram

Embodiment: as shown in Figure 1, described tripping relay is serially connected on zero-power line (N) and live wire (L) inlet wire by the tripping relay (J2) at the two poles of the earth, utmost point by the two poles of the earth normally closed relay (J3) is serially connected in (G) on the earth connection, and another utmost point is serially connected on the control coil of (J2) relay; When the protection ground wire of water heater does not have good earth; 5. electrothermal tube self breaks or power firestreak (L) and ground wire (E) short circuit; cause when outer cover of water heater contacts electric leakage with human body; pass zero sequence current mutual inductor (Y1) 7., current imbalance (Y2), zero-sequence transformer just has current signal output; this signal is behind control circuit (IC1); trigger controllable silicon (S1), (S2), control tripping relay (J2) and relay (J3) outage.As shown in Figure 2, be provided with the insulation isolating joint in 3., be used for isolating the outer water pipe caused recoil leakage current that leaks electricity for some reason at water inlet pipe that water heater is connected with feed pipe.

Claims (2)

1. the earth leakage protective device with comprehensive creepage protection function of an electric heater special use; comprise zero sequence current mutual inductor, control circuit; tripping relay; it is characterized in that: have at least a zero sequence current mutual inductor (Y1) to be set on the water inlet pipe or outlet pipe of electric heater; zero line (N) and live wire (L) pass another zero-sequence transformer (Y2) simultaneously, and the working power on tripping relay and control circuit road is on the zero line (N) and live wire (L) in the outside, tripping relay contact.

2. the earth leakage protective device with comprehensive creepage protection function of electric heater special use according to claim 1, it is characterized in that: described tripping relay is serially connected on zero-power line (N) and live wire (L) inlet wire by the tripping relay (J2) at the two poles of the earth, is serially connected in (E) on the earth connection by the utmost point of the two poles of the earth normally closed relay (J3); Another utmost point is serially connected on the control coil of (J2) relay. and zero sequence current signal triggers controllable silicon (S1), (S2) behind control circuit, control tripping relay (J2) and relay (J3) outage.

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