CN105277838A - Device for checking high-voltage electric energy metering device wiring - Google Patents

Abstract

The invention discloses a device for checking the wiring of high-voltage electric energy metering equipment, which relates to the technical field of high-voltage electric energy; the Ua, Ub, and Uc terminals of the electric energy meter are respectively connected with three-phase sinusoidal alternating voltage, and are connected with a voltage transformer, and the voltage mutual inductance The transformer is grounded through the grounding wire on the load side and forms a current loop on the high-voltage bus. A current transformer is installed on the high-voltage bus, and the current transformer is connected to the Ua and Uc terminals of the electric energy meter respectively; The sinusoidal AC voltage, read the secondary current flowing into the energy meter, and draw the voltage and current phasor diagram at the end of the energy meter to judge whether the wiring of the high-voltage electric energy metering device is correct.

Description

A device for checking wiring of high-voltage electric energy metering equipment

technical field

The invention relates to a device for checking the wiring of high-voltage electric energy metering equipment, which belongs to the technical field of high-voltage electric energy.

Background technique

The device used for high-voltage electric energy metering in the prior art is mainly a high-voltage electric energy meter, which is a kind of two single-phase high-voltage electric energy metering devices connected between the A-B and C-B phases, and all its electronic devices work at high voltage. The high-voltage side has extremely high requirements on reliability. After a fault, it must be repaired after a power outage. Moreover, it is difficult to obtain power from the high-voltage side, and reliability is difficult to guarantee.

Contents of the invention

In view of the above problems, the technical problem to be solved by the present invention is to provide a device for checking the wiring of high-voltage electric energy metering equipment.

A device for checking the wiring of high-voltage electric energy metering equipment according to the present invention, which includes an electric energy meter, a voltage transformer, and a current transformer; the Ua, Ub, and Uc terminals of the electric energy meter are respectively connected to a three-phase sinusoidal AC voltage, and are connected to the voltage mutual inductance The voltage transformer is grounded through the ground wire on the load side and forms a current loop on the high-voltage bus. A current transformer is installed on the high-voltage bus, and the current transformer is connected to the Ua and Uc terminals of the electric energy meter respectively.

The beneficial effects of the present invention are:

1. The structure is simple, the cost is low, the effect is good, the reliability is high, and it is easy to popularize and apply;

2. The wiring is simple, which solves the problems of complex wiring of traditional high-voltage electric energy metering devices, long secondary connecting wires or cables, and difficult inspection of transformer installation and wiring in high-voltage switch cabinets;

3. By applying a lower sinusoidal AC voltage at the end of the electric energy meter, reading the secondary current flowing into the electric energy meter, and drawing the voltage and current phasor diagram at the end of the electric energy meter, it is judged whether the wiring of the high-voltage electric energy metering device is correct.

Description of drawings

For ease of illustration, the present invention is described in detail by the following specific implementations and accompanying drawings.

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention is described below through specific embodiments shown in the accompanying drawings. It should be understood, however, that these descriptions are exemplary only and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

As shown in Figure 1, this specific embodiment adopts the following technical solutions: it includes an electric energy meter, a voltage transformer PT, and a current transformer CT; the Ua, Ub, and Uc terminals of the electric energy meter are respectively connected to a three-phase sinusoidal AC voltage, and Connect with the voltage transformer PT, the voltage transformer PT is grounded through the grounding wire on the load side and forms a current loop on the high-voltage bus, the current loop generates a current I1, and a current transformer CT is installed on the high-voltage bus, and the current transformers are respectively connected to the electric energy The Ua and Uc terminals of the meter are connected, and the current one I1 passes through the current transformer CT to generate the current two I2.

The working principle of this specific embodiment is: use a high-sensitivity milliampere level clamp ammeter to obtain the current I2 at the energy meter end, draw the phasor diagram of the three-phase sinusoidal AC voltage and the current II2, and pass the three-phase sinusoidal AC voltage The phasor diagram of the current two I2 can judge whether the overall wiring of the electric energy metering device is correct; by calculating the ratio of the current one I1 and the current two I2, the transformation ratio of the current transformer can also be obtained.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. A device for checking the wiring of high-voltage electric energy metering equipment is characterized in that: it comprises an electric energy meter, a voltage transformer, and a current transformer; the Ua, Ub, and Uc terminals of the electric energy meter are connected to three-phase sinusoidal alternating current voltage respectively, and Connect with the voltage transformer, the voltage transformer is grounded through the grounding wire on the load side and forms a current loop on the high-voltage bus, and the current transformer is installed on the high-voltage bus, and the current transformer is respectively connected to the Ua and Uc terminals of the electric energy meter.