The comprehensive error of electric energy measurement in the transformer secondary voltage drop tester is composed of the composite error of the voltage transformer, the composite error of the current transformer, the error of the electricity meter, and the measurement error caused by the voltage drop of the secondary wire of the voltage transformer. Among these four errors, the measurement error caused by the voltage drop of the secondary wire of the voltage transformer is often significant. Excessive comprehensive error in electric energy measurement is a common key problem in electric energy measurement.

The verification regulations and relevant technical regulations for electric energy metering devices stipulate that errors caused by voltage drop in the secondary circuit of voltage transformers must be accurately and quickly measured.

Product Features

1. Three phase three wire, three-phase four wire, single-phase fully automatic measurement;

2. The instrument has an automatic range switching function to ensure testing accuracy;

3. The combination of electronic principle circuits and DSP technology ensures good testing stability and strong anti-interference ability;

4. After the measurement is completed, various parameters related to load are automatically calculated for customer analysis and testing;

5. Adopting a large screen Chinese character LCD display, all operations are prompted by Chinese character menus; The data has power-off storage and browsing functions, and can be transmitted online with a computer;

6. Powered by a large capacity 7.2V11Ah lithium battery, it does not have any impact on the testing circuit and avoids system protection situations. Simultaneously use without power supply on site;

7. The secondary load test uses a clamp type ammeter to sample the current without disconnecting the secondary circuit. It can achieve uninterrupted online measurement. Automatic range switching: During the measurement process, it can be switched to different positions according to the different values of the test object, ensuring measurement accuracy and display bit count;

8. Comes with a lightweight charger for easy measurement, and can be connected to an external charger for measurement when the battery is low;

9. The instrument has a small volume and light weight;

10. Extremely wide range of secondary operating current/voltage. At a working current of 50mA, it can distinguish resistance and reactance of 1m Ω, and can test the online actual load of S-class current transformers with a secondary rated current of 5A; At a working voltage of 5V, it can distinguish conductivity and electronegativity of 0.001mS;

Technical Specifications

1. Environmental conditions

Temperature: -10 ° C to 40 ° C

Relative humidity:<85% (25 ° C)

Altitude:<2500m

External interference: no particularly strong vibrations, no particularly strong electromagnetic fields

2. Main technical indicators of the instrument during the secondary pressure drop test

⑴. Measurement range: Ratio difference: 0.001% to 19.99% Angle difference: 0.01 'to 599'

⑵. Resolution: Ratio difference: 0.001% Angle difference: 0.01 '

⑶. Basic instrument error

——DX=± (2% × X+2% × Y) ± 2 characters;

——DY=± (Y × 2%+X × 2% × 34.38) ± 2 words.

Two words - quantification error of the instrument

⑷. Voltage meter accuracy: 0.5%

⑸. Working range voltage: (50-120) V

⑹. Instrument indicates action value (error prompt)

——Error: The ratio difference is greater than 20% or the angle difference is greater than 600 '.

——Voltage: Voltage<2.0V.

3. Main technical indicators of the instrument during PT secondary load testing

⑴. PT secondary load test

——Admittance measurement range: 0.1ms-50.0ms

——Secondary voltage (50V-120V)

DX=± (2% × X+2% × Y) ± 2 words

DY=± (2% × X+2% × Y) ± 2 words

Two words - quantification error of the instrument

Attention: When the measured value is below 0.2mS, the test voltage should be kept above 50V, and at the same time, pay attention to keeping the through wire of the clamp meter centered. At this point, the quantification error of the instrument is 5 words

⑵. Voltage meter head: 0.5%

4. Main technical indicators of the instrument during CT secondary load testing

——Impedance measurement range: 0.1 Ω -50.0 Ω

——Impedance measurement accuracy:

DX=± (2% × X+2% × Y) ± 2 words

DY=± (2% × X+2% × Y) ± 2 words

Two words - quantification error of the instrument

Current meter head: 1%

Information organization: Yangzhou Topu Electric Technology Co., Ltd