CN204228944U - A kind of typical non linear load electric energy table calibration equipment - Google Patents

Abstract

A typical non-linear load electric energy meter calibration device includes electric energy meter parameter recorder I, PC, power source and electric energy meter parameter recorder II. The electric energy meter field parameter recorder Ⅰ is connected with a PC through a communication port, and a typical nonlinear load characteristic database and a typical nonlinear measurement environment prototype database are established in the PC. The PC is connected to the input terminal of the power source, and it is controlled to send out the voltage and current waveforms required for calibration. The voltage and current output terminals of the power source are respectively connected to the corresponding terminals of the tested meter, and at the same time connected to the corresponding terminals of the electric energy meter field parameter recorder II. The low-frequency output terminal of the tested meter is connected with the pulse input terminal of the electric energy meter field parameter recorder II. The utility model can realize the simulation verification of the electric energy meter under the typical nonlinear load, and can examine the dynamic measurement characteristics of the electric energy meter.

Description

A typical non-linear load electric energy meter calibration device

technical field

The utility model relates to a calibration device for a typical nonlinear load electric energy meter, which belongs to the technical field of electrical measurement.

Background technique

There are various forms of load in the power system. In addition to the common linear load, there are also various nonlinear loads. For example: high-power silicon rectifier equipment in electrolysis plants, AC-DC electric arc furnaces in steelmaking plants, AC inverters, high-power electric drive equipment, motor frequency conversion speed control devices, etc. For these nonlinear loads, the waveform of the signal no longer presents a typical sinusoidal waveform, and its frequency and amplitude change drastically with certain rules.

The existing electric energy meter calibration device only evaluates the measurement characteristics of the electric energy meter under the linear load, and calculates the relative error according to the different errors measured by the tested meter and the standard meter under the same linear load point, and then calculates the relative error according to the According to the provisions of the corresponding verification regulations, it is judged whether the meter under inspection meets the requirements. The metering characteristics of energy meters under typical non-linear loads are not considered. At present, there is no device for calibrating the metering characteristics of electric energy meters under typical nonlinear loads.

Contents of the invention

The purpose of this utility model is, in order to overcome the deficiencies of the prior art, to provide a typical non-linear load electric energy meter verification device, which is used to verify the metering characteristics of the electric energy meter under the typical non-linear load, so as to facilitate the examination of the electric energy meter In dynamic indicators and offline verification.

The technical solution of the utility model is that a typical non-linear load electric energy meter calibration device of the present utility model includes: electric energy meter parameter recorder I, PC, power source and electric energy meter parameter recorder II. The energy meter parameter recorder Ⅰ is connected to the PC through the communication port; the output terminal of the PC is connected to the power source; the voltage output terminal of the power source is respectively connected to the tested meter and the energy meter parameter recorder II; the current output terminal of the power source is connected to the energy meter parameter Recorder II, and connected to the tested meter through the electric energy meter parameter recorder II; the inspected meter has a port directly connected to the electric energy meter parameter recorder II; the electric energy meter parameter recorder II is connected to the PC.

The PC has a built-in typical nonlinear load characteristic database and a typical nonlinear measurement environment prototype database.

The working principle of the utility model is that the electric energy meter field parameter recorder I is connected with the port of the PC through the communication port, and a typical nonlinear load characteristic database and a typical nonlinear measurement environment prototype database are established in the PC. The PC is connected to the input terminal of the power source, and the power source is controlled to send out the required voltage and current waveforms. The voltage and current terminals at the output end of the power source are respectively connected to the corresponding terminals of the meter under test, and the output of the power source is connected to the corresponding voltage and current terminals of the electric energy meter field parameter recorder II at the same time. The low-frequency output port of the tested meter is connected with the pulse input port of the electric energy meter field parameter recorder II.

Electric energy meter field parameter recorder Ⅰ is used to collect on-site load waveforms, store the data of typical nonlinear load waveforms, and then transmit the data to a PC through the communication port for analysis and processing. After the PC receives the data and completes the analysis and processing, two typical nonlinear load databases are established respectively, namely: typical nonlinear load characteristic database and typical nonlinear metering environment prototype database. When calibration is required, the PC retrieves data from the above-mentioned database and controls the power source to output the corresponding typical nonlinear load waveform. Energy meter parameter recorder II records the waveform specific parameters of voltage and current at this time, and at the same time receives the low-frequency pulse signal transmitted to it by the measured energy meter and transmits it to the PC through the communication port, and the PC analyzes and processes it to obtain the measured electric energy. Metrological characteristics of the meter under typical nonlinear loads.

Compared with the prior art, the beneficial effect of the utility model is: the present invention analyzes and processes the typical nonlinear load collected on site through a PC, and establishes a corresponding typical nonlinear load characteristic database and a typical nonlinear metering environment prototype database , by calling the waveform data in the database, the simulation and restoration of the on-site dynamic load measurement environment is realized, and finally the verification of the electric energy meter under the typical nonlinear load of electric energy is realized.

Description of drawings

Fig. 1 is a structural schematic diagram of a typical non-linear load electric energy meter calibration device of the present invention.

Detailed ways

The specific embodiment of the utility model is as shown in Figure 1.

A typical non-linear load electric energy meter calibration device in this embodiment includes: electric energy meter parameter recorder I, PC, power source and electric energy meter parameter recorder II. The energy meter parameter recorder Ⅰ is connected to the PC through the communication port; the output terminal of the PC is connected to the power source; the voltage output terminal of the power source is respectively connected to the tested meter and the energy meter parameter recorder II; the current output terminal of the power source is connected to the energy meter parameter Recorder II, and connected to the tested meter through the electric energy meter parameter recorder II; the inspected meter has a port directly connected to the electric energy meter parameter recorder II; the electric energy meter parameter recorder II is connected to the PC. The PC has a built-in typical nonlinear load characteristic database and a typical nonlinear metering environment prototype database.

Electric energy meter parameter recorder Ⅰ collects the waveform of the typical non-linear load on site and saves the data. The electric energy meter parameter recorder Ⅰ is connected with the PC through the communication port, and transmits the typical nonlinear load data recorded and saved from the field to the PC. Through the processing and analysis of the data, the PC sets up the typical nonlinear load characteristic database and the typical nonlinear metering environment prototype database respectively.

When the power source retrieves data from the typical nonlinear load characteristic database and outputs a specific load waveform, the simulation of the typical nonlinear load measurement environment can be realized at this time. The low-frequency signal output by the watt-hour meter under such load is transmitted to the parameter recorder II of the watt-hour meter, and then transmitted to the PC through the signal port. dynamic metering characteristics.

When the power source retrieves data from the typical nonlinear metering environment prototype database and outputs specific load waveforms, the typical nonlinear load metering environment can be reproduced at this time. The low-frequency signal output by the tested electric energy meter under such a load is transmitted to the electric energy meter parameter recorder II, and then transmitted to the PC through the signal port, and the PC will analyze and process the data, and then obtain the measured The dynamic metering feature of the table.

Claims (2)

1. a typical non linear load electric energy table calibration equipment, is characterized in that, described device comprises parameters of electric energy meter registering instrument I, PC, power source and parameters of electric energy meter registering instrument II; Parameters of electric energy meter registering instrument I connects PC by communication port; PC exports termination power source; The voltage output end of power source connects tested table and parameters of electric energy meter registering instrument II respectively; The current output terminal of power source connects parameters of electric energy meter registering instrument II, and connects tested table by parameters of electric energy meter registering instrument II; Tested table has Single port direct connection parameters of electric energy meter registering instrument II; Parameters of electric energy meter registering instrument II connects PC.

2. a kind of typical non linear load electric energy table calibration equipment according to claim 1, is characterized in that, described PC built-in typical non linear load profile storehouse and typical non linear metering environment prototype data storehouse.