CN2030387U

CN2030387U - Automatic protector for 220v single-phase source

Info

Publication number: CN2030387U
Application number: CN 87204939
Authority: CN
Inventors: 汤赣生
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-03-24
Filing date: 1987-03-24
Publication date: 1989-01-04

Abstract

The utility model discloses an automatic protector for a 220v single-phase power source, which has the delaying start in 0 to 20 minutes and can normally work in the 170V to 380V changing range of alternate current voltages. The utility model can automatically cut off a power source in the voltage value of over voltage above 250V and 170V low voltage. Thus, single-phase electrical equipment, household appliance and cooling-heating electrical equipment with large power are protected. The utility model has the protecting load power under 3000W, and is provided with a protection device for external over voltages (namely lightning voltages).

Description

Automatic protector for 220V single-phase source

The utility model belongs to the automatic safety device of 220V single phase poaer supply.

Though prior art also has the 250V overvoltage; the defencive function of 170V low-voltage and 0～20 minute delayed startup; but its obvious weak point is: in the distribution system of three-phase four-wire system; when zero line and phase line misconnection; automatic protector itself holds overvoltage that can't stand 380V and burns; thereby lost single-phase electric equipment, comprise the protective effect of household electrical appliance.In addition, when lightning voltage was invaded, promptly under the situation of exterior overvoltage, automatic protector itself easily went to pot because of there not being the technical measures of lightning protection, thereby had also lost the protective effect to single-phase electric equipment.

In addition, the automatic protector of prior art mostly is just to have connecting-disconnecting function at the 200W low power range with interior, and to the high-power single-phase electric equipment more than the 200W, the perhaps high power capacity more than 200W is with uncontrollable and protection.

In the Searches of Patent Literature, Chinese patent " family expenses overvoltage protector " (patent No.: 85203948.4) though have perfect over-voltage protection function, because of it does not have low-voltage variation and delayed startup function, thereby perfect inadequately yet.

The purpose of this utility model is that to seek a kind of protection structure comprehensive, and power capacity is big, and good reliability has delayed startup and force start function, both can prevent abnormal overvoltage, can prevent the 220V single phase poaer supply automatic protector of external overvoltage again.And this automatic protector not only has and cuts off the above overvoltage of 250V, simultaneously can be under superpotential situation, and promptly in the voltage range that floats of 250V～380V, but operate as normal still, thus safety, play superpotential protective effect reliably.

This device is applicable to the single-phase electric equipment of 220V that 3000W is following, and the power supply protection aspect automatically of high-power cold-warm electric appliance equipment and household electrical appliance.

Accompanying drawing is an embodiment of the present utility model.

This automatic protector is parallel in the civil power 220V electrical voltage system, mainly by AC overvoltage holding circuit L₁, delayed startup and low voltage protection circuit L₂AC load outlet and force start circuit L₃, overvoltage signal circuit L₄, external antenna and lightning voltage discharge circuit L₅Form.

L ₁Be the AC overvoltage holding circuit, in the distribution system of three-phase four-wire system, when zero line and phase line misconnection, or because of neutral line break, cause neutral-point displacement, or because of neutral line break, the phase line broken string takes place again then, when causing the overvoltage of other two-phase 380V, J₁The actuating of relay, its normally-closed contact J₁－1，J ₁-2 return, transformer B dead electricity, J₂Relay electric-loss and disconnecting consumers, thus played the effect of overvoltage protection. At this moment, J₁Although relay bears the overvoltage of 250V～380V, at R₁Under the effect of dropping resistor, can not damage, still can work, protect reliably single-phase circuit equipment.

L ₂Be delayed startup and under-voltage protection circuit, the former limit of power transformer B is at J ₁-1, J ₁Under the control of-2 contacts, be subjected to 220V voltage, pair limit of transformer B is direct current 12V through rectification.C ₁Be the ac filter electrochemical capacitor.By resistance R ₄With electrochemical capacitor C ₂Form RC delay circuit (delay time is 0～20 minute).During work, because of C ₂Charging finishes, to T ₁Double-basis utmost point tube discharge, T ₁Double-basis utmost point pipe conducting work, its pulse is through adjustable resistance R ₇, trigger controllable silicon, start J ₂Relay is finished the delayed startup program.

Under-voltage protection is by D ₂The puncture voltage of voltage-stabiliser tube determines.Voltage-stabiliser tube D ₂Be serially connected in+DC circuit of 12V in, when the primary alternating voltage was lower than 170V, transformer secondary output had only 9V, was lower than the puncture voltage of voltage-stabiliser tube, voltage-stabiliser tube oppositely ends ,+12V is in off-state, entire circuit quits work.(more than the 170V, 250V is following) could work when this circuit only was worth more than exchanging 170V, thereby played under-voltage protection and delayed startup effect reliably.

L ₃Be AC load outlet and force start circuit, the J in the circuit ₂-1, J ₂The-2nd, the contact of direct control load, when load characteristic under situation about still can work below the 165V, the perhaps artificial overvoltage that do not need, when under-voltage protection and delayed startup, can be with control switch K ₁Press the position of " opening ", i.e. short circuit J ₂-1, J ₂Load is directly connected with power supply in-2 contacts, has promptly removed overvoltage, under-voltage protection and delayed startup this moment.For the sake of security, though press the force start K switch ₁, but when overvoltage, still can send the overvoltage alarm signal.

L ₄Be the overvoltage alarm circuit, just often, because of J ₁-3 contacts disconnect, signal lamp D ₁Do not work.When the above overvoltage of 250V is arranged in the power supply, J ₁The relay contact adhesive, J ₁-3 close logical, signal lamp D ₁Lamp is bright, sends alarm signal, D ₁Signal lamp is in resistance R ₂Effect down can be in the voltage range of 250V-380V operate as normal, can not burn because of bearing overvoltage.

L ₅Be external antenna and thunder discharge circuit, BL ₁Be connected to the live wire of single phase poaer supply, just often BL ₁Discharge tube is in the disconnection cut-off state, in case when being higher than the lightning voltage of 550V and invading, puncture discharge over the ground immediately, thereby play the protective effect of exterior overvoltage, when lightning voltage disappears, the discharge tube attitude that promptly restores to the original state.

BL ₂Being the discharge tube that is used for external antenna, being connected to the downlead of external antenna, normally is cut-off state.When antenna is subjected to the thunder and lightning intrusion, BL ₂Promptly punched discharge over the ground, played the lightning protection effect of external antenna.

The utlity model has overvoltage protection (250V～380V), under-voltage protection (165～185V), delayed startup (0～20 minute) and prevent the defencive function of lightning voltage (being exterior overvoltage).And under the over-voltage condition of 380V, still can work as usual, automatic protector itself can not burn, damage because of overvoltage, thereby plays the protective effect of single phase poaer supply effectively.

Claims

1, a kind of 220V single phase poaer supply automatic protector that has 0～20 minute delayed startup and can operate as normal in exchanging 170V～380V regulation of line voltage is by AC overvoltage protective circuit L ₁, delayed startup and under-voltage protection circuit L ₂, AC load outlet and force start circuit L ₃, overvoltage signal circuit L ₄, external antenna and lightning voltage discharge circuit L ₅Form, it is characterized in that the J in the AC overvoltage protective circuit ₁The normally-closed contact of relay is connected on two ends of transformer B primary coil.

2, according to claim 1,220V single phase poaer supply automatic protector is characterized in that the live wire of load power source and ground wire are connected to J in delayed startup and the under-voltage protection circuit ₂On the normally opened contact of relay.

3, according to claim 1,220V single phase poaer supply automatic protector is characterized in that the J in delayed startup and the under-voltage protection circuit ₂The bearing power that the normally opened contact of relay is controlled is below 3000W.