CN204925279U - Steal electric detection means - Google Patents

Abstract

The utility model discloses a steal electric detection means, the device include controller unit, and its triggering signal generation unit sends the alien frequencies signal to scene measurement secondary circuit, signal generating unit, its input links to each other with controller unit, and the output links to each other with scene measurement secondary circuit, signal acquisition element, it is gathered from the alien frequencies signal of on -the -spot measurement secondary circuit feedback to convey to controller unit, controller unit calculates the alien frequencies admittance value of the alien frequencies signal that signal acquisition element acquireed. The utility model discloses a device of modularized design, signal generating unit, signal acquisition element and controller unit all concentrate on in the solitary module for should prevent lacking the compact structure and the interference immunity that flow steal electric detection means and improve greatly, it is anti -electricity -theft effectual.

Description

Electricity theft detection device

technical field

The utility model relates to the field of power electronics, in particular to a power stealing detection device.

Background technique

At present, with the rapid development of my country's national economy and the improvement of people's living standards, the demand for electricity is increasing day by day. As a result, a group of illegal units or individuals have carried out stealing behaviors in pursuit of high profits. The stealing behaviors have not only seriously disrupted the normal operation order of the power supply system, but also brought huge economic losses to the country. Our country's law has not issued a specific normative system for electricity theft, and the related reward and punishment system is not perfect enough. It will take some time to rely on laws to control electricity theft.

The electric energy measurement of the electric energy meter is based on the electric energy calculation formula The purpose of stealing electricity can be achieved by changing four factors that affect electric energy, that is, changing voltage U, current I, time t, power factor Any one of them can make the measurement of the electric energy metering device inaccurate. Although there are various stealing methods at present, they can be summarized into the following five types: the method of stealing electricity under voltage, the method of stealing electricity without current, the method of phase shifting, the method of stealing electricity with increasing difference, and the method of stealing electricity without metering device.

Stealers use various means to deliberately change the correct wiring of the current loop in the electric energy metering device, or intentionally cause a fault in the current loop in the electric energy metering device, such as opening or shorting the current loop, changing the transformation ratio of the transformer, etc., affecting the power of the electric energy metering device. Correct measurement results in the lack of current in the working mode used by the electric energy meter, transformer, etc. in the electric energy metering device, resulting in the electric energy metering device under-counting or not counting the electricity. This method of stealing electricity is called the lack of current stealing method.

What needs to be explained about the current anti-theft technology is that it is impossible for any method or product to prevent all methods of electricity theft. Each anti-theft technology has certain limitations, so a variety of anti-theft technologies are required In order to achieve the best anti-stealing effect, it must be configured reasonably.

Utility model content

In order to solve the above problems, the utility model provides a electricity stealing detection device, which judges whether there is a lack of current stealing behavior by measuring the different-frequency admittance value of the loop, so as to achieve the purpose of simple structure and high detection accuracy of the detection device.

In order to achieve the above object, the utility model adopts the following technical solutions:

A power theft detection device, comprising:

The controller unit, whose trigger signal generating unit sends different frequency signals to the on-site metering secondary circuit;

The signal generating unit, whose input end is connected with the controller unit, and whose output end is connected with the on-site measurement secondary circuit;

The signal acquisition unit collects the different-frequency signals fed back from the on-site metering secondary loop and transmits them to the controller unit, and the controller unit calculates the different-frequency admittance values of the different-frequency signals acquired by the signal acquisition unit.

The anti-current stealing detection device also includes a current transformer, one end of which is connected to the signal generation unit and the signal acquisition unit respectively, and the other end is connected to the on-site measurement secondary circuit.

The signal generating unit is also provided with three-phase current connection terminals.

There are three current transformers, which are respectively connected to the A-phase, B-phase and C-phase lines of the on-site metering secondary circuit.

The signal generating unit, the signal collecting unit and the controller unit are all integrated into a single module.

The frequency at which the trigger signal generating unit of the controller unit outputs different-frequency signals to the on-site metering secondary circuit is at least in the order of kHz.

The beneficial effects of the utility model:

(1) The utility model is a modular design device, the signal generation unit, the signal acquisition unit and the controller unit are all concentrated in a single module, so that the structure of the anti-current stealing detection device is compact and the anti-interference is greatly improved Improvement, anti-stealing effect is good;

(2) The signal generation unit of the present utility model has three-phase current connection terminals, which can be conveniently connected in series with the secondary circuit of on-site measurement, and its series connection is realized through a current transformer, which effectively prevents the secondary circuit from being opened; the current transformer can collect Feedback signal of secondary loop of on-site metering.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the current-shortage-stealing anti-electricity detection device of the present invention.

Among them, 1. a controller unit, 2. a signal generation unit, and 3. a signal acquisition unit.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

As shown in Fig. 1, a kind of electric stealing detecting device comprises: a controller unit 1, and its trigger signal generating unit 2 outputs different frequency signals to the secondary circuit of on-site metering;

The signal generating unit 2, its input end is connected with the controller unit 1, and its output end is connected with the on-site measurement secondary circuit;

Signal acquisition unit 3, which collects the different-frequency signals fed back from the on-site metering secondary loop, and transmits them to the controller unit 1, and the controller unit 1 calculates the different-frequency admittance values of the different-frequency signals collected by the signal acquisition unit 3; the controller Unit 1 compares the calculated different-frequency admittance value with the different-frequency admittance value when the on-site metering secondary circuit is in normal operation, so as to judge whether the on-site metering secondary circuit has the behavior of electricity theft by lack of current method.

The anti-current stealing detection device also includes a current transformer, one end of which is connected to the signal generation unit and the signal acquisition unit respectively, and the other end is connected to the secondary circuit of on-site measurement.

Furthermore, high-precision CT can be selected as the current transformer, which can effectively prevent the secondary circuit from being open, and the CT can collect the feedback signal of the secondary circuit for on-site measurement.

Furthermore, there are three current transformers, which are respectively connected to the A-phase, B-phase and C-phase lines of the on-site metering secondary circuit.

Further, the signal generation unit 2 is also provided with three-phase current connection terminals; the three-phase current connection terminals of the signal generation unit 2 are respectively connected to the first high-precision CT, the second high-precision CT and the second high-precision CT.

Further, the signal generation unit 2, the signal acquisition unit 3 and the controller unit 1 are all integrated into a single module.

The frequency at which the trigger signal generating unit of the controller unit 1 outputs different frequency signals to the on-site metering secondary circuit is at least in the order of kHz.

The controller unit 1 can be realized by using a 51 single-chip microcomputer or other control processors.

The working method of the anti-current stealing detection device of the present utility model includes:

The current transformer of the anti-current stealing detection device is connected in series with the three phases A, B, and C of the on-site metering secondary circuit;

After power supply, the controller unit 1 controls the signal generating unit 2 to output 1.6kHz different-frequency voltage signals to the three-phase circuits of the on-site metering secondary circuit respectively. At this time, the entire on-site metering secondary circuit will generate current in this frequency band. Because the frequency of the signal is much higher than the fundamental frequency of 50Hz, the generated different frequency current will not affect the normal fundamental measurement current of the circuit;

The signal acquisition unit 3 collects the different-frequency current signal of the secondary circuit of on-site metering, and transmits it to the controller unit 1 for data calculation and sorting, so as to obtain the different-frequency admittance value;

The admittance value can be transmitted to the display device or other data management database through the communication interface of the controller unit 1; finally, the admittance value obtained by the test is compared with the admittance value under normal operation to determine whether there is a defect in the loop. Stream stealing behavior:

When the calculated different-frequency admittance value is larger than the different-frequency admittance value during normal operation of the on-site metering secondary circuit, a short-circuit fault occurs in the on-site metering secondary circuit;

When the calculated different-frequency admittance value is smaller than the different-frequency admittance value when the secondary circuit of on-site metering is in normal operation, an open circuit fault occurs in the secondary circuit of on-site metering.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (6)

1. a fraudulent use detection device, is characterized in that, comprising:

Controller unit, its trigger pip generating unit sends alien frequencies signal to situ metrology secondary circuit;

Signal generating unit, its input end is connected with controller unit, and output terminal is connected with situ metrology secondary circuit;

Signal gathering unit, it gathers the alien frequencies signal from situ metrology secondary circuit feedback, and is sent to controller unit, and controller unit calculates the alien frequencies admittance value of the alien frequencies signal that described signal gathering unit obtains.

2. a kind of fraudulent use detection device as claimed in claim 1, is characterized in that, described fraudulent use detection device also comprises current transformer, and its one end is connected with signal gathering unit respectively with signal generating unit, and the other end is connected with situ metrology secondary circuit.

3. a kind of fraudulent use detection device as claimed in claim 1, is characterized in that, described signal generating unit is also provided with three-phase current splicing ear.

4. a kind of fraudulent use detection device as claimed in claim 2, is characterized in that, the number of described current transformer is three, is connected respectively with the A phase of situ metrology secondary circuit, B phase with C phase circuit.

5. a kind of fraudulent use detection device as claimed in claim 1, is characterized in that, described signal generating unit, signal gathering unit and controller unit all concentrate in an independent module.

6. a kind of fraudulent use detection device as claimed in claim 1, is characterized in that, the frequency that described controller unit trigger pip generating unit exports alien frequencies signal to situ metrology secondary circuit is at least kHz magnitude.