CN2577294Y - Monitor for preventing ilegal-use of electricity - Google Patents

Abstract

The utility model relates to a monitoring alarm device for preventing the illegal-use of electricity, which belongs to the field of circuit devices. The utility model mainly comprises a device casing in which an electronic circuit board is installed; a fixing board is installed outside the device casing. The utility model is characterized in that the casing is connected under a cable in the position of a secondary low-voltage sleeve pipe of a transformer, a mutual inductor which has an identical variation ratio with that of a mutual inductor in a metering box in a circuit is sheathed with the casing, and a lead wire of the mutual inductor is directly led in the metering box. The utility model can be used for effectively preventing electricity stealing caused by short-circuiting wires, disconnecting wires, crossing TA secondary wires, crossing TA primary wires, short-circuiting TA primary wires and using a meter reversing device of high current or high voltage from the sublevel of a transformer to the front part of the metering box, and alarms can be given in time to effectively prevent electricity stealing.

Description

The anti-electric theft monitoring device

Technical field

The utility model belongs to the circuit arrangement field, specially refers to a kind of anti-electricity-theft supervising device.

Background technology

Carrying out civilization education energetically, advocate under sincere, the moral social morals situation, more should strengthen to the strong prevention of all dirty pool with stop, anti-electricity-theft work has been exactly task important, that often grab of power department, since its long term, perplexing power supply department always, so far solved completely as yet,, regrettably still do not had the real desirable anti-electricity-theft product of a kind of energy so far though there are many units successively to develop multiple anti-electricity-theft product.Current, the means of stealing are a lot, and concerning electricapparatus formula watt-hour meter, modal mode remains short circuit, disconnection, intersection TA secondary line, short circuit TA primary line (the goat's horn mutual inductor is very easily implemented); The most serious stealing mode is to utilize to show device, and watt-hour meter is reversed fast, and the short time gets final product a large amount of stealings; The most difficult strick precaution still by stealing before the batch meter, especially directly connects the load stealing at transformer secondary output; Certainly, using the kicker magnet stealing, also is extremely difficult the strick precaution.For some original stealing electricity methods, as remove watt-hour meter and link up with, disconnect the means such as curtage coil inlet wire of watt-hour meter, owing to need open watt-hour meter junction box, destroy lead sealing, can stay tangible stealing evidence, be easy to be investigated and prosecuted and track down burglar's event few people's use, and electron watt-hour meter is still not mature enough so far, thereby territory of use is few, also be difficult for generally promoting, whatsoever the electron watt-hour meter of sample for short circuit, disconnects the TA secondary line, short circuit TA primary line is especially for by before the batch meter, the transformer secondary output stealing, yet all be helpless.And the anti-electricity-theft product that has, the discovery stealing is taken precautions against cutting off the electricity supply, unallowed often, for this reason, the possibility of all kinds of stealings of the comprehensive above-mentioned generation of the inventor, develop a kind of anti-electric theft monitoring warning device, pilot signal directly is connected with the running of watt-hour meter, and when stealing took place, watt-hour meter ran well or fast turn-around, do not reach the stealing purpose, this device can also instant alarming simultaneously.

Summary of the invention

The utility model is in the prior art, anti-electricity-theft device is undesirable, or because of electron watt-hour meter powerless, or some device need be cut off the electricity supply and carried out many weak points such as anti-electricity-theft, and redesigning a kind of anti-electricity-theft monitoring alarm device, the purpose of this utility model realizes by the following technical solutions, a kind of anti-electric theft monitoring warning device, mainly comprise an apparatus housing, electronic circuit board of inner installation.Outside fixed head for installing is characterized in that this casing is connected to the below of transformer secondary output low-tension bushing place cable, and put one with circuit in the batch meter mutual inductor change than identical mutual inductor, with the direct introducing batch meter of its lead-in wire; On this electronic circuit board, be furnished with monitoring circuit.Described monitoring circuit mainly is connected to voltage comparator ic by hall device H1, H2 _1～3And relay J _1～3Transformer B ₁, by rectifier bridge Z _1～4Be connected to triode G _1～3And diode D _1～4, be connected to the BJ alarm.In the line, hall device is enclosed within current coil and the point of incoming cables of monitoring mutual inductor, IC ₁, IC ₂, IC ₃Differentiate the size of voltage on size and the zero line of signal voltage of hall device output respectively,, pass through relay J in case the generation stealing electricity phenomenon is just exported high level ₁, J ₂The control watt-hour meter runs well tongue tube K ₁Relay J is passed through in the stealing of monitoring kicker magnet when stealing takes place ₃Power transformer B ₁On big electric current be added to and make watt-hour meter fast turn-around on the watt-hour meter and report to the police.Described fixed head for installation usefulness is double-layer plate, middle and dress tongue tube, and watt-hour meter and monitoring circuit plate are all laid on it.

The beneficial effects of the utility model are, this device can prevent effectively that short circuit TA primary line uses big electric current or high voltage to show device for short circuit, disconnection, intersection TA secondary line, the TA primary line that intersects, all can in time report to the police by the stealing of transformer secondary output before the batch meter, stealing is effectively prevented.

Description of drawings

Fig. 1 is anti-electric theft monitoring warning device annexation figure in electric system

Fig. 2 is this supervising device appearance synoptic diagram

Fig. 3 is this device and watt-hour meter fixed relationship synoptic diagram

Fig. 4 is the schematic diagram of monitoring circuit.

Embodiment

With reference to Fig. 1, Fig. 2, represent this device annexation figure and device appearing diagram in electric system.Wherein monitoring device 1, and it is connected the position of the low-tension bushing 2 of transformer B, and places the below of cable 3, in the inside of apparatus housing 1 circuit board is installed.Its disembarkation is furnished with supervisory circuit 4, and Fig. 3 represents supervising device and watt-hour meter annexation figure, among the figure, watt-hour meter 5 it and supervising device together be installed in double-layer plate fixed head 5 above, be connected with tongue tube K in the supervisory circuit ₁, with reference to Fig. 4, supervisory circuit schematic diagram on the expression wiring board, B1 is a transformer among the figure, Hall monitoring part is H ₁, H ₂, the voltage commutation bridge is Z _1～4, comparer TC _1～3, tongue tube is K ₁, BJ is an alarm, and monitoring mutual inductor JT induces current signal by transformer secondary output and sends into supervising device, and Hall monitoring part is H ₂Be enclosed within on its lead-in wire H ₁Be enclosed within the current coil point of incoming cables of watt-hour meter, H ₁, H ₂With the monitoring voltage signal respectively through rectifier bridge Z ₂, Z ₃Rectification, capacitor C ₂, C ₃Filtering is by R ₁, R ₂Output adds to voltage comparator ic ₁, when being short-circuited, disconnecting, intersecting TA secondary line (because the end of TA and the same end unification of meter current coil connect the earth, the old friend pitches the TA secondary line and equals short circuit TA secondary line), short circuit TA primary line, during the stealing of batch meter front, IC ₁The output high level is through diode D ₁, resistance R ₃, triode G ₁Make relay J ₁Adhesive, J ₁Normally closed contact disconnect the current coil of watt-hour meter, its normally opened contact can be connected and monitor mutual inductor JT, makes the watt-hour meter normal operation, IC ₁Output through R ₄, G ₂Connect alarm BJ and make it to report to the police, when utilizing big electric current to show the device stealing, IC ₂The output high level is through D ₂, R ₃, G ₁Make J ₁Adhesive makes watt-hour meter run well W ₁Give IC ₂Provide the reference voltage of watt-hour meter rated current work, IC ₂Output, also pass through D ₂, R ₄, G ₂Make alarm equipment alarm; When taking place to use high voltage to show the device stealing, capacitor C ₄After the high voltage step-down on the zero line that has raise, through rectifier bridge Z ₄Rectification, filter capacitor C ₅Filtering is by resistance R ₅Be added to voltage comparator ic ₃Signal end, IC ₃The output high level is through R ₆, G ₃Make relay J ₂Adhesive, J ₂Normally closed contact disconnect N and go up high voltage, J ₂Normally opened contact connect ground wire, make watt-hour meter run well W ₂Give IC ₂Provide a reference voltage, IC ₃Output also pass through D ₃, R ₄, G ₂Make alarm equipment alarm.

When utilizing the kicker magnet stealing, tongue tube K1 adhesive makes relay J ₃Adhesive, J ₃Normally closed contact disconnect the current coil of watt-hour meter, J ₃Normally opened contact connect the big electric current that transformer B1 produces, make watt-hour meter running at full capacity (big electric current is the rated operational current of watt-hour meter).K1 is also through D simultaneously ₄, R ₄, G ₂Make alarm equipment alarm, the specified big electric current of the secondary generation watt-hour meter of transformer B1 and 12V voltage are through rectifier bridge Z ₁, capacitor C ₁Provide+the 12V power supply to circuit after the filtering.

Among the embodiment, JT be with batch meter in the mutual inductor of the identical no-load voltage ratio of mutual inductor, voltage comparator can be used LM393, relay can be with common miniature relay (electric current that the contact allows to pass through be not less than 10A), and transformer is the 20W power transformer, and rectifier bridge is 1A, triode can be used common triode, diode can be used IN4007, C1-220 μ f, C ₂, C ₃, C ₅-10 μ f, R ₁-6-10K Ω, tongue tube 0.5A, alarm+12V gets final product.

Claims (3)

1, a kind of anti-electric theft monitoring warning device, mainly comprise an apparatus housing, electronic circuit board of inner installation, outside fixed head for installing, it is characterized in that, this casing is connected to the below of transformer secondary output low-tension bushing place cable, and put one with circuit in the batch meter mutual inductor change than identical mutual inductor, with the direct introducing batch meter of its lead-in wire; On this electronic circuit board, be furnished with monitoring circuit.

2, anti-electric theft monitoring warning device according to claim 1 is characterized in that, described monitoring circuit mainly is connected to voltage comparator ic by hall device H1, H2 _1～3And relay J _1～3Transformer B1 is by rectifier bridge Z _1～4Be connected to triode G _1～3And diode D _1～4, be connected to the BJ alarm, in the line, hall device is enclosed within current coil and the point of incoming cables of monitoring mutual inductor, IC ₁, IC ₂, IC ₃Differentiate the size of voltage on size and the zero line of signal voltage of hall device output respectively,, pass through relay J in case the generation stealing electricity phenomenon is just exported high level ₁, J ₂The control watt-hour meter runs well, and relay J is passed through in the stealing of tongue tube K1 monitoring kicker magnet when stealing takes place ₃Big electric current on the power transformer B1 is added to makes watt-hour meter fast turn-around on the watt-hour meter and report to the police.

3, anti-electric theft monitoring warning device according to claim 1 is characterized in that, described fixed head for installation usefulness is double-layer plate, middle and dress tongue tube, and watt-hour meter and monitoring circuit plate are all laid on it.

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