Field Calibrator of Three-Phase Electric Energy Meter DYDN-III

Product introduction
DYDN-III multi-function electric energy meter field calibrator is a high-precision testing instrument developed by our company, which integrates electric parameter measurement, electric energy meter calibration and wiring judgment. The instrument is equipped with high precision and high linearity voltage transformer and current transformer, which makes the instrument have high measurement accuracy for various parameters. At the same time, it is equipped with clamp type current transformer, which makes the field wiring simple and can be directly connected without disconnecting the current loop.

The instrument uses large screen color LCD as the display, and the Chinese graphical operation interface is equipped with Chinese prompt information and multi parameter LCD display interface. The man-machine conversation interface is friendly. The vector diagram display and wiring judgment provide a reliable basis for checking the correctness of the circuit. The full touch conductive silicone keyboard is easy to operate and learn. The instrument is built with a large capacity data memory without loss of power loss, which can save the on-site calibration data, and can store up to 1000 groups of on-site calibration results. It can provide a background computer management software, which can upload the results to the computer to achieve microcomputer based management.

The instrument adopts the engineering plastic shell independently designed and manufactured by our company. The appearance of the instrument is beautiful and practical. The on-site test operation is convenient.

Functional features

1. The instrument is a high-precision testing instrument that integrates the calibration of electric energy meters, the testing of electrical parameters and the detection of power quality problems such as waveform distortion, voltage fluctuation and three-phase imbalance in the power grid.

2. Under the condition of no power failure, no change to the measuring circuit, and no opening of the measuring equipment, the comprehensive error of the measuring equipment is detected online under the actual load.

3. Accurately measure voltage, current, active power, reactive power, phase angle, power factor, frequency and other electrical parameters, so as to calculate the measurement error of the test equipment circuit.

4. The optional virtual load box can also accurately measure the meter when the user has no load or ultra-low load.

5. It can display the vector diagram of the measured voltage and current, and the user can analyze the vector diagram to determine whether the wiring of the metering equipment is correct. At the same time, 48 connection modes can be automatically judged in three-phase three wire connection mode; The function of automatic calculation of retroactive power is convenient for users to calculate retroactive power for users with wiring problems.

6. The current circuit can be measured with clamp type transformer, and the operator can conduct the measurement conveniently and safely without disconnecting the current circuit.

7. It can calibrate voltmeter, ammeter, power meter, phase meter and other indicating instruments, as well as three-phase three wire, three-phase four wire, single-phase 1A and 5A active and reactive energy meters.

8. Photoelectric, manual, pulse and other methods can be used to calibrate the electric energy meter.

9. Measure and analyze the AC power quality supplied by the public power grid to the user, which can measure and analyze: frequency deviation, voltage deviation, voltage fluctuation, allowable three-phase voltage imbalance and grid harmonics.

10. It can display single-phase voltage and current waveforms and three-phase voltage and current waveforms at the same time.

11. Load fluctuation monitoring: measure and analyze the fluctuation of power quality of public power grid caused by various electrical equipment under different operating conditions. Record and store voltage, current, active power, reactive power, apparent power, frequency, phase and other electric parameters.

12. Power equipment adjustment and dynamic monitoring of operation process can help users solve problems in the process of power equipment adjustment and operation.

13. Test and analyze the dynamic parameters of reactive power compensation and filtering devices in power system, and make quantitative evaluation on their functions and technical indicators

14. With perpetual calendar and clock functions, it can display the date and time in real time. The test data and results can be saved at the same time of on-site verification, and uploaded to the computer through the serial port. The data can be managed through the background management software (options).

15. The imported large screen color LCD is used as the display, and the Chinese graphical operation interface is equipped with Chinese prompt information and multi parameter LCD display interface, with friendly man-machine conversation interface

16. It is small in size, light in weight and easy to carry. It can be used not only for on-site measurement, but also as standard measuring equipment in the laboratory.

Technical indicators

1. Input Properties

Voltage measurement range: 0~400V, 57.7V, 100V, 220V, 400V four gear automatic switching range.

Current measurement range: 0~5A. The built-in transformer is divided into 5A (CT). The clamp transformer has six gears: 5A (small tong), 25A (small tong), 100A (medium tong), 500A (medium tong), 400A (tong) and 2000A (tong). (Medium and large caliper meters are optional)

Phase angle measurement range: 0~359.999 °.

Frequency measurement range: 45~55Hz.

2. Accuracy

Measurement verification part:

Voltage: ± 0.05% (± 0.1%)

Current: ± 0.05% (± 0.1%) (clamp type transformer ± 0.5%)

Active power: ± 0.05% (± 0.1%) (clamp transformer ± 0.5%)

Reactive power: ± 0.3% (± 0.5%) (clamp transformer ± 1.0%)

Active electric energy: ± 0.05% (± 0.1%) (clamp transformer ± 0.5%)

Reactive electric energy: ± 0.3% (± 0.5%) (clamp type transformer ± 1.0%)

Frequency: ± 0.05% (± 0.1%)

Phase: ± 0.2 °

3. Power quality

Fundamental wave voltage and current amplitude: allowable error of fundamental wave voltage ≤ 0.5% F.S; Allowable error of fundamental wave current ≤ 1% F.S

Measurement error of phase difference between fundamental wave voltage and current: ≤ 0.5 °

Measurement error of harmonic voltage content: ≤ 0.1%

Measurement error of harmonic current content: ≤ 0.2%

Three phase voltage unbalance error: ≤ 0.2%

4. Operating temperature
Working temperature: - 10 ºC~+40 ºC

5. Insulation
(1) The insulation resistance of the voltage and current input terminals to the enclosure shall be ≥ 100MΩ.
(2) The power frequency between the input end of the working power supply and the shell is 1.5KV (effective value), and the test lasts for 1 minute.

6. Standard electric energy pulse constant
Standard electric energy pulse constant: built-in transformer constant (FL)=10000 r/kW · h,

Clamp type transformer constant (FL):

7. Weight: 2Kg
8. Volume: 32cm × 24cm × 13cm