CN112710883A - Method for checking mutual inductor to steal electricity - Google Patents

Abstract

A method for checking mutual inductor electricity stealing is capable of accurately identifying specific abnormal users and preventing electricity stealing of high-supply high-count current mutual inductors. The method comprises the following steps: sequentially sleeving three Rogowski coils on K of three-phase current transformer of electricity consumer₁Measuring, and sequentially sleeving three Rogowski coils on a three-phase current transformer K₂End, measure again, the measuring device displays I_A/I_a，I_B/I_b，I_C/I_cChecking that the ratio is consistent with the multiplying power of the nameplate or the electric energy meter; sequentially sleeving any Rogowski coil on K of three-phase current transformer₁And K₂End, pass if the measurement device display current indication is zero; otherwise, at least one end is broken; sleeving the first Rogowski coil on the phase K of the phase A of the current transformer₁And a third Rogowski coil is sleeved on the K of the C phase of the current transformer₁A terminal; at the moment, the current value display is a B-phase secondary current value, and if the current value is consistent with the A-phase secondary current value and the C-phase secondary current value, the current value is normal; otherwise, the connection is reversed.

Description

Method for checking mutual inductor to steal electricity

Technical Field

The invention relates to a method for checking the electricity stealing of a mutual inductor, belonging to the technical field of electricity stealing prevention.

Background

With the development of the power industry and the progress of science and technology, various electricity stealing technical methods are updated. Nowadays, electricity consumers not only steal electricity on the electricity meter, but also steal electricity by using a mutual inductor (especially a current mutual inductor), and the electricity stealing phenomenon is not enough to prevent. The electricity stealing users cannot be identified timely and accurately only by the line loss monitor in the transformer area.

The transformer area line loss monitor is used for storing and performing simple power consumption analysis by collecting information of electric energy meters of power consumption customers. And analyzing whether the user uses electricity in an unconventional electricity utilization and electricity stealing mode or not according to field collected electricity utilization data by combining background analysis software, positioning the position of the user according to the table number, and further performing field check to determine the suspected user of abnormal electricity utilization. The method is not timely and accurate in judgment, and needs to find the abnormal problem in the transformer area and determine the specific power consumption customer, so that the aim of checking and stealing the electricity cannot be fulfilled.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a method for detecting the electricity stealing of a mutual inductor, which has strong universality and simple and convenient operation, can accurately identify specific abnormal users, and can prevent the electricity stealing of the high-supply high-count current mutual inductor.

The technical solution of the invention is as follows: a method for checking mutual inductor and stealing electricity is characterized in that: (1) testing whether the actual variable ratio is consistent with the nameplate of the electric energy meter, namely whether the multiplying power of the electric energy meter is correct or not;

sequentially sleeving the Rogowski coil L1, the Rogowski coil L2 and the Rogowski coil L3 on three power consumers A, B, CPhase current transformer K₁And the measuring device is utilized to start measurement, and then the three Rogowski coils are sequentially sleeved on the A, B, C three-phase current transformer K₂When the measurement is performed again, the measurement device will display I_A/I_a，I_B/I_b，I_C/I_cChecking that the ratio is consistent with the multiplying power of the nameplate or the electric energy meter;

(2) testing for phase loss

Sequentially sleeving any Rogowski coil on K of A, B, C three-phase current transformer₁And K₂End, pass if the measurement device display current indication is zero; if the display current is not zero, the phase K of the user current transformer is shown₁Or K₂At least one end of the terminal is disconnected, and the electric energy meter charges one third of the electric quantity at the moment;

(3) testing whether three-phase reverse connection phenomenon exists

Sleeving the Rogowski coil L1 on the K of the A phase of the client current transformer₁The Rogowski coil L3 is sleeved on the K of the C phase of the client current transformer₁A terminal; at the moment, the current value displayed by the display of the measuring device is a B-phase secondary current value, and if the magnitude of the current value is consistent with the A-phase secondary current value and the C-phase secondary current value, the current value is normal; if the B-phase secondary current value is 1.75 times of the A-phase or C-phase secondary current value, the A-phase and C-phase secondary terminals of the user current transformer are reversely connected.

The invention has the beneficial effects that: the abnormal user information can be timely and accurately searched, the Rogowski coil is adopted for measurement, the abnormal electric energy change condition of the Rogowski coil is convenient to rapidly monitor, the monitoring numerical value is more accurate and rapid through a high-precision measurement mode, and the current transformer wrong wiring checking and electricity stealing mode is broken through.

Drawings

FIG. 1 is a schematic diagram of the circuit structure of the measuring device of the present invention;

FIG. 2 is an external view of the measuring device;

fig. 3 is a wiring diagram of the present invention.

Detailed Description

As shown in the figure, the method for checking mutual inductor and stealing electricity comprises the following steps:

(1) testing whether the actual variable ratio is consistent with the nameplate of the electric energy meter, namely whether the multiplying power of the electric energy meter is correct or not;

sequentially sleeving the Rogowski coil L1, the Rogowski coil L2 and the Rogowski coil L3 on the K of the three-phase current transformer of the power consumer A, B, C₁And the measuring device is used for starting measurement and consists of a signal processing module, an analog-to-digital conversion module, a main processor, a liquid crystal display module, a key processing module, a communication module and a data storage module, and then three Rogowski coils are sequentially sleeved on the A, B, C three-phase current transformer K₂When the measurement is performed again, the measurement device will display I_A/I_a，I_B/I_b，I_C/I_cChecking that the ratio is consistent with the multiplying power of the nameplate or the electric energy meter;

(2) testing for phase loss

Sequentially sleeving any Rogowski coil on K of A, B, C three-phase current transformer₁And K₂End, pass if the measurement device display current indication is zero; if the display current is not zero, the phase K of the user current transformer is shown₁Or K₂At least one end of the terminal is disconnected, and the electric energy meter charges one third of the electric quantity at the moment;

(3) testing whether three-phase reverse connection phenomenon exists

Sleeving the Rogowski coil L1 on the K of the A phase of the client current transformer₁The Rogowski coil L3 is sleeved on the K of the C phase of the client current transformer₁A terminal; at the moment, the current value displayed by the display of the measuring device is a B-phase secondary current value, and if the magnitude of the current value is consistent with the A-phase secondary current value and the C-phase secondary current value, the current value is normal; if the B-phase secondary current value is 1.75 times of the A-phase or C-phase secondary current value, the A-phase and C-phase secondary terminals of the user current transformer are reversely connected.

The above description is only exemplary of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A method for checking mutual inductor to steal electricity is characterized in that:

step 1, testing whether the actual variable ratio is consistent with an electric energy meter nameplate, namely whether the multiplying power of the electric energy meter is correct or not;

sequentially sleeving the Rogowski coil L1, the Rogowski coil L2 and the Rogowski coil L3 on the K of the three-phase current transformer of the power consumer A, B, C₁And the measuring device is utilized to start measurement, and then the three Rogowski coils are sequentially sleeved on the A, B, C three-phase current transformer K₂When the measurement is performed again, the measurement device will display I_A/I_a，I_B/I_b，I_C/I_cChecking that the ratio is consistent with the multiplying power of the nameplate or the electric energy meter;

step 2 testing whether phase failure exists

Sequentially sleeving any Rogowski coil on K of A, B, C three-phase current transformer₁And K₂End, pass if the measurement device display current indication is zero; if the display current is not zero, the phase K of the user current transformer is shown₁Or K₂At least one end of the terminal is disconnected, and the electric energy meter charges one third of the electric quantity at the moment;

step 3, testing whether three phases are connected reversely

Sleeving the Rogowski coil L1 on the K of the A phase of the client current transformer₁The Rogowski coil L3 is sleeved on the K of the C phase of the client current transformer₁A terminal; at the moment, the current value displayed by the display of the measuring device is a B-phase secondary current value, and if the magnitude of the current value is consistent with the A-phase secondary current value and the C-phase secondary current value, the current value is normal; if the B-phase secondary current value is 1.75 times of the A-phase or C-phase secondary current value, the A-phase and C-phase secondary terminals of the user current transformer are reversely connected.

Images