CN2081570U

CN2081570U - One-phase overload break circuit

Info

Publication number: CN2081570U
Application number: CN 90216979
Authority: CN
Inventors: 李贺功
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-08-04
Filing date: 1990-08-04
Publication date: 1991-07-24

Abstract

The utility model relates to a one-phase overload break circuit which is a one-phase overload break circuit arranged in a commercial power supply line. The one-phase overload break circuit is composed of a box body, an electromagnetic relay arranged inside the box body, and a control circuit; the normally-closed contact of the electromagnetic relay is connected in series with the live wire of the power supply; when the control circuit triggers the electromagnetic relay to attract, the normally-closed contact is switched off and the live wire is power off; when the control circuit controls the electromagnetic relay to timed release, the normally-closed contact is switched on and the live wire is time delayed to restore feeding. The utility model has the advantages of simple structure, convenient installation and operation, small electricity loss, and adjustable rated load and adjustable delaying feeding restoration. The utility model is especially suitable for power departments used for preventing electric larceny and overloaded power utilization.

Description

One-phase overload break circuit

The utility model relates to a kind of being installed in the mains supply circuit to prevent the single-phase overload breaker device of stealing or excess load electricity consumption.

In the power supply and electricity consumption of civil power, overload, short circuit and even the stealing of locality often may take place.Especially stealing electricity phenomenon and the excess load electricity consumption that takes place in China rural area seriously disturbed the normal power supply and the planned power consumption of power department, and caused waste of electric energy.Therefore, power department is sought after a kind of device that can cut off the power supply automatically when stealing electricity phenomenon or excess load electricity consumption take place.At present, though various overcurrent of the prior art or overload protection arrangement also can cut off the power supply automatically, still need manual closing operation when recovering to send electricity when overcurrent or overload.And this class device is mostly in order to protect electrical equipment or personal safety and to be that power department is powerless by user's control, so can not prevent the generation of electrical phenomena of stealing electricity phenomenon or excess load effectively.

To be that design is a kind of be installed in the mains supply circuit and by the single-phase overload breaker device of power department control, when stealing or excess load electricity consumption took place, this device can be cut off the electricity supply automatically the purpose of this utility model; After overload was eliminated, this device can recover to send automatically.

To achieve these goals, the utility model is installed an electromagnetic relay and is designed a control circuit in power circuit, and when stealing or excess load electricity consumption took place, control circuit can trigger the electromagnetic relay adhesive and make the power firestreak outage; When the time-delay of control circuit control electromagnetic relay discharged, power firestreak was connected automatically, is recovered to send.Technology spy to the single-phase overload circuit breaker of the utility model is described in further detail below in conjunction with specific embodiment.

Accompanying drawing 1 is the structural representation of single-phase overload circuit breaker box body;

Accompanying drawing 2 is the electromagnetic relay and the control circuit figure thereof of single-phase overload circuit breaker.

With reference to the accompanying drawings 1,2, the single-phase overload circuit breaker of the utility model mainly is made of box body 1 and the electromagnetic relay and the control circuit thereof that are installed in the box body.Box body 1 is a cuboid, its front have one related with variable resistor in the box body and be used to select the rated load value dial position switch 2, its underpart has two entrance holes 3 that are respectively applied for introducing power firestreak and zero line and entrance hole 4 and two and is respectively applied for the wire hole 5 and the wire hole 6 of drawing power firestreak and zero line.

Electromagnetic relay J ₁Comprise primary coil L ₁With secondary coil L ₂And normally-closed contact J _1-1, normally-closed contact J _1-1Be serially connected with in the power firestreak.When control circuit triggers J ₁During adhesive, normally-closed contact J _1-1Disconnection, live wire outage; When the time-delay of control circuit control electromagnetic relay discharges, normally-closed contact J _1-1Connection, live wire recover to send automatically.

The electromagnetic relay control circuit comprises sensor trigger circuit, relay J ₃And the time relay.Sensor trigger circuit is by current transformer, diode d ₂, capacitor C ₄, controllable silicon TD, variable resistor R ₃With the single contact relay J ₄Form the primary coil L of current transformer ₁Be serially connected with in the power firestreak diode d ₂, relay J ₄With controllable silicon TD successively with the secondary coil L of current transformer ₂Serial connection, d ₂Negative pole and J ₄Join C ₄With L ₂And d ₂Parallel connection, R ₃Be serially connected with in the control extremely of TD J _4-1And J _2-2With J ₁Primary coil L ₁Series connection.When load surpasses rated load, L ₂In induced current through d ₂And C ₄Trigger the TD conducting after the rectification and make J ₄Fixed fire 0.1 second, J _4-1Make J ₁Energising and adhesive, J _1-1Disconnection, live wire outage.Variable resistor R ₃Related with group position switch 2 of box body front, manual adjustment is dialled position switch 2 can change R ₃Resistance and and then change the rated load value.

Relay J ₃With bridge rectifier G ₁Pass through J _2-1With electromagnetic relay J ₁Secondary coil L ₂Serial connection, J _3-1And J _2-2With L ₁Series connection, J ₄Fixed fire makes J ₁During adhesive, L ₂The middle induced current that produces makes J after the G1 rectification ₃Adhesive, J _3-1Connect and make J ₁Keep attracting state, thus the time J _4-1Fixed fire disconnects after 0.1 second.

The time relay is by bridge rectifier G ₁, filter capacitor C ₃, resistance R ₁, variable resistor R ₂, capacitor C ₁, unijunction transistor BT and relay J ₂Form G ₁, BT and J ₂Through J _2-1Be serially connected R ₂With C ₂Series connection back and BT and J ₂Parallel connection, R ₁, C ₃All with BT and J ₂Parallel connection, R ₂With C ₂Interface and BT base stage join C ₁With C ₂In parallel.Work as J ₁When adhesive, live wire outage, L ₂The induced current that is produced is through G ₁Rectification and C ₃Trigger J by the time-delay of RC delay circuit after the filtering ₂Adhesive, J _2-1And J _2-2Make J ₃And J ₁Discharge J simultaneously _1-1Connection, live wire automatic time delay recover to send.Overload is eliminated as yet when sending electricity as recovery, then J ₁With adhesive once more, delay recovery send again then.So repeat adhesive and discharge, eliminate until overload.Adjust R ₂Resistance can change and recover to send electricity time-delay length.

The utility model structure and circuit are all very simple, easy to install and use, and electricity decreases little, and rated load value and recovery send the electricity time-delay all can be controlled by power department.Therefore, the utility model is particularly suitable for power department as the device that prevents stealing and excess load electricity consumption.

Claims

1, a kind of single-phase overload circuit breaker that is installed in the mains supply circuit is characterized in that it is to be made of box body and the electromagnetic relay and the control circuit thereof that are installed in the box body; Described box body is a cuboid, its front have one related with variable resistor in the box and be used to select group position switch of rated load value, its underpart has two entrance holes and two wire holes, and power firestreak and zero line insert circuit breaker by two entrance holes respectively and drawn by two wire holes respectively; Described electromagnetic relay comprises primary coil, secondary coil and normally-closed contact, and its normally-closed contact is serially connected with in the power firestreak.

2, circuit breaker according to claim 1 is characterized in that described electromagnetic relay control circuit is by sensor trigger circuit, relay J ₃Form with the time relay; Described sensor trigger circuit is by current transformer, diode d ₂, capacitor C ₄, controllable silicon TD, variable resistor R ₃With the single contact relay J ₄Form the primary coil L of current transformer ₁Be serially connected with in the power firestreak d ₂, J ₄With TD successively with the secondary coil L of current transformer ₂Serial connection, d ₂Negative pole and J ₄Join C4 and L ₂And d ₂Parallel connection, R ₃Be serially connected with in the control extremely of TD; Relay J ₃With bridge rectifier G ₁Pass through relay J ₂Normally-closed contact J _2-1With electromagnetic relay J ₁Secondary coil L ₂Serial connection; The time relay is by bridge rectifier G ₁, filter capacitor C ₃, resistance R ₁, variable resistor R ₂, capacitor C ₁, unijunction transistor BT and relay J ₂Form G ₁, BT and J ₂Through J _2-1Serial connection, R ₂With C ₂Series connection back and BT and J ₂Parallel connection, R ₁, C ₃All in parallel with BT and J2, R ₂With C ₂Interface and BT base stage link C ₁With C ₂In parallel.