CN2230449Y - Device for preventing fraudulent use of electricity for three-phase electric meter - Google Patents

Abstract

The utility model discloses a device for preventing fraudulent use of electricity for a three-phase electric meter, comprising a transformer, a rectification circuit, a voltage regulating circuit and a relay power amplification circuit. The device for preventing fraudulent use of electricity for a three-phase electric meter is characterized in that when the door of the three-phase electric meter case is closed, a broken gate control switch is serially connected in a base biasing circuit of the relay power amplification circuit after connected with a reed pipe which is attracted under the action of the anomalous field. A set of normally open contacts of the relay is serially connected to the power supply line of electromagnetic and counting circuit of electric larceny memory. The device for preventing fraudulent use of electricity for a three-phase electric meter has the electric larceny memory function, and hardly consumes the energy when the electric larceny happens.

Description

The three-phase kilowatt-hour meter anti-electricity-theft device

The utility model relates to a kind of improved three-phase kilowatt-hour meter anti-electricity-theft device, and it includes the 220V alternating current is become galvanic stabilized voltage supply 555 time base circuits.

China Patent No. is that 93234532.8 " multi-functional anti electric larceny three phase controllers " disclose a kind of multi-functional three-phase kilowatt-hour meter controller for preventing illegal use of electricity, it comprises power supply, signal transducer, electronic switch, control circuit and topworks, its signal transducer is by mutual inductor T1, T2, T3 and T4, T5, T6 forms, T1, T2, the former limit of T3 is connected on respectively on three preceding phase lines of ammeter table, its secondary is connected mutually, T4, T5, the former edge joint of T6 is on three phase lines behind the ammeter table, its secondary is series connection mutually also, T1, T2, secondary signal and the T4 of T3, T5, the secondary signal of the T6 two ends through be connected on a potentiometer after the rectification anti-phasely respectively forms the stealing detection signal after superposeing, cut off feed circuit by relay control, wait not have the stealing situation and recover normal power supply, the no stealing memory of this device.

Task of the present utility model provides a kind of anti-electricity-theft device of three-phase kilowatt-hour meter, this device have stealing memory (time) function, power consumption hardly when no stealing.

Task of the present utility model is finished as follows, this three-phase kilowatt-hour meter anti-electricity-theft device, it includes transformer, rectification circuit, mu balanced circuit, the relay power amplifier, have two and the thresholding amplifying circuit that connects, its input termination one can be closed the switch of thresholding amplifying circuit, one tunnel output connects 555 time base circuits, export the control end of electromagnetic registration circuit to, another road output terminal is connected to the light emitting diode that shows stealing memory indication, be serially connected in the base stage biasing circuit of relay power amplifier after the gate controlled switch that when the three-phase kilowatt-hour meter case shuts up the door carefully, disconnects and the dry-reed tube switch parallel connection that adhesive under the anomalous field effect is being arranged, one group of normally opened contact of relay is serially connected in the supply line of thresholding amplifying circuit and 555 time base circuits, when useful high-intensity magnetic field carries out stealing or the stealing of people's sled table case is arranged, the base stage biasing circuit of relay power amplifier is connected, the actuating of relay, having connected the thresholding amplifying circuit has the supply line of 555 time base circuits, make its work. electromagnetic registration circuit timing signal is provided, finish the stealing memory function, the relay power amplifier is not worked during no stealing, integrated circuit supply line is obstructed, thereby originally installs power consumption hardly when not having stealing.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is the electrical schematic diagram of the three-phase kilowatt-hour meter anti-electricity-theft device that provides of the utility model.

In Fig. 1, the 220V alternating current is through transformer T transformation. output 18V alternating current, to commutation diode D1-D4, by 4 voltage stabilizings of three-terminal voltage-stabilizing ic chip, 12V is provided direct current, relay J 1 and power tube Q1, be connected in series with resistance R 2 after gate controlled switch K and the dry-reed tube switch TH120 parallel connection, constitute the base stage biasing circuit of power tube Q1, gate controlled switch K is contained on the door of three-phase kilowatt-hour meter case, door is an off-state when shutting, at the dry-reed tube switch TH120 that has adhesive under the anomalous field effect is being arranged on the three-phase kilowatt-hour meter.Two and the thresholding amplifying circuit JC1 that connects adopt integrated of LM324, one tunnel output meets time base circuit IC2, IC2 adopts integrated of NE555, the output of IC2 is connected to the control end of electromagnetic registration circuit through resistance R 20, another road output terminal is connected to the LED 4 that shows stealing memory indication, and one group of normally opened contact JK1 of relay J 1 is serially connected in the supply line of IC1 and IC2.

The anomalous field effect is arranged around three-phase kilowatt-hour meter, it is the high-intensity magnetic field stealing, when dry-reed tube switch TH120 is closed, perhaps the someone pries open the three-phase kilowatt-hour meter chamber door, gate controlled switch K closure, the base electrode bias resistance R2 of power tube Q1 inserts, make power tube D1 conducting, relay J 1 line Bao Dedian, one group normally opened contact JK1 closure, 12V voltage is supplied with ic chip 1, the IC2 supply voltage promptly is connected to 4 pin of IC1 and 8 pin of IC2, and the high level of 1 pin of IC1 output at this moment is to 4 pin of IC2, IC2 is triggered and starts working, high level of 3 pin per minutes output of IC2 promotes the power tube Q2 of electromagnetic registration circuit, and control electromagnetic registration device J work timing is by the electromagnetic registration device J memory stealing time (being the time ammeter test leakage or stealing).7 pin of IC1 are also exported a high level simultaneously, make LED 4 luminous, do stealing memory indication and use.Because relay J 1 is not worked during no stealing, JK1 cut-out DC circuit power supply, power consumption hardly when no stealing.

Present embodiment also has the three-phase kilowatt-hour meter fault detection capability: one, when the A phase current coil in the three-phase kilowatt-hour meter or A phase current mutual inductor to three-phase kilowatt-hour meter connecting line opens circuit or during loose contact, this device is connected on the K1 on the current transformer, voltage between two terminals of K2 can raise, both end voltage adds to 4 pin of the sensor TH-330 of this device, 5 pin, make LED 5 luminous, photoresistance R25 is low-resistance, the 8 pin output high level of TH-330, make switching tube Q5 conducting, switching tube Q5 conducting makes LED 3 luminous, as the current coil indicating fault, switching tube Q4 conducting simultaneously makes 5 pin ground connection of ic chip 3, IC3 adopts integrated of KD9561, IC3 work is also sent alerting signal, make triode Q3 work, send the siren chimes of doom, the B phase power coil in the same three-phase kilowatt-hour meter or B phase current mutual inductor to three-phase kilowatt-hour meter connecting line opens circuit or during loose contact by loudspeaker Y, also can send the siren chimes of doom, C mutually too.Two, when three-phase kilowatt-hour meter any one or two potential windings burn out or open circuit, the neutral point of three-phase kilowatt-hour meter is that zero line common point current potential will raise, according to this principle, it is sensor TH-440 on the zero line pin that this device has a neutral point that is serially connected in three-phase kilowatt-hour meter, do not influence the normal operation of three-phase kilowatt-hour meter after the serial connection, when the potential winding of three-phase kilowatt-hour meter has fault, light emitting diode LDE1 in the sensor TH-440 is luminous, photoresistance R21 is low-resistance, noble potential is through resistance R 29, triode Q6 conducting, make LED 2 luminous, the potential winding fault of indication three-phase kilowatt-hour meter makes switching tube Q4 conducting simultaneously, 5 pin ground connection of ic chip 3, IC3 work is also sent alerting signal, makes triode Q3 work, sends the siren chimes of doom by loudspeaker Y.

When the people strides the phase stealing, the neutral point of three-phase kilowatt-hour meter is that zero line common point current potential also can raise, light emitting diode LDE1 in the sensor TH-440 is luminous, and photoresistance R21 is low-resistance, bias current is provided for power tube Q1 through resistance R 30, make it conducting, relay J 1 gets electric, and normally opened contact JK1 closure provides power supply for IC1, IC2, the electromagnetic registration circuit is started working, and the time of phase stealing is striden in memory.When the meter reading personnel need open the three-phase kilowatt-hour meter case, available electron key S1 closes the electromagnetic registration circuit, electron key S1 is inserted lock Z, the line bag of the diode cut-in relay J2 of alternating voltage in electron key, capacitor C 8, C9 filtering, the normally opened contact JK2 adhesive of J2 makes 3 pin of JC1,5 pin are low level, close the thresholding amplifying circuit, 1 pin of IC1,7 pin output low levels, effectively close the electromagnetic registration circuit, make the automatic control timing ineffective, after three-phase kilowatt-hour meter is shut, S1 extracts this electron key, the outage of relay J 2 line bags, its JK2 is normally open, and stealing automatic control timing circuit is in normal operating conditions again.

Claims (1)

1, a kind of three-phase kilowatt-hour meter anti-electricity-theft device, it includes transformer, rectification circuit, mu balanced circuit, the relay power amplifier, it is characterized in that: have two and the thresholding amplifying circuit IC1 that connects, its input termination one can be closed the switch JK2 of thresholding amplifying circuit, one tunnel output connects 555 time base circuits, export the control end of electromagnetic registration circuit to, another road output terminal is connected to the LED 4 that shows stealing memory indication, be serially connected in the base stage biasing circuit of relay power amplifier after the gate controlled switch K that disconnects when the three-phase kilowatt-hour meter case shuts up the door carefully and the dry-reed tube switch TH120 parallel connection that adhesive under the anomalous field effect is being arranged, one group of normally opened contact JK1 of relay is serially connected in the supply line of thresholding amplifying circuit and 555 time base circuits.

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