The establishment of 10-500/√3kV power frequency voltage ratio standard apparatus and study of the calibration method

1994 ◽  
Vol 43 (4) ◽  
pp. 671-675
Author(s):  
Guanggan Gao ◽  
Baowang Zhao
Keyword(s):  
Calibration Method ◽  
Standard Apparatus ◽  
Voltage Ratio ◽  
Power Frequency

Measure Characteristic of UHV Power Frequency Voltage Ratio Standard

2011 ◽  
Vol 354-355 ◽  
pp. 1210-1215
Author(s):  
Feng Zhou ◽  
Min Lei ◽  
Xiao Dong Yin ◽  
Shu Han Zhang
Keyword(s):  
Measuring Method ◽  
Voltage Measurement ◽  
Voltage Transformer ◽  
Ratio Measurement ◽  
Measurement Traceability ◽  
Voltage Ratio ◽  
Voltage Coefficient ◽  
National Power ◽  
Power Frequency ◽  
Better Than

In order to meet the urgent needs of voltage measurement traceability and transfer in the construction of ultra-high voltage power grid, 1000kV series standard voltage transformer is developed as the standard instrument, and then its measurement characteristics is tested. According to the theory and construction of the series power frequency voltage ratio standard, semi-insulating transformer voltage summation is proposed to make the voltage ratio measurement of SSTV whose accuracy can reach the 0.02 level trace to the source of national power frequency ratio standard of 500kV successfully. The compatibility is better than compared to traditional voltage coefficient measuring method.

A Design of Circuit and its Application of the Power Frequency Voltage Linear Superposition Method

2012 ◽  
Vol 220-223 ◽  
pp. 1564-1572
Author(s):  
Qiang Song ◽  
Feng Pan
Keyword(s):  
Measuring Circuit ◽  
Superposition Method ◽  
Linear Network ◽  
Voltage Transformer ◽  
Linear Superposition ◽  
Voltage Ratio ◽  
Voltage Coefficient ◽  
In Series ◽  
Power Frequency ◽  
Calibration Techniques

In order to improve the power frequency voltage ratio standard calibration techniques to meet the application of UHV power grid，a measuring circuit based on power frequency voltage linear superposition method was proposed. A three-port network was fromed by connecting two shielding voltage transformer with the same rated voltage ratio in series. The voltage coefficient of a voltage transformer was tested by double voltage method based on the proportionality and superposition of the linear network. The measuring circuit based on power frequency voltage linear superposition method can prevent the shielding error of the voltage transformer during the mearurment, making it used in voltage ratio standard self-calibration system with higher voltage and precision. The test has proved the feasibility and accuracy of circuit of power frequency voltage linear superposition method.

scholarly journals Reducing the uncertainty of strain gauge amplifier calibration

ACTA IMEKO ◽  
2017 ◽  
Vol 6 (4) ◽  
pp. 69 ◽  
Author(s):  
Miha Hiti
Keyword(s):  
Strain Gauge ◽  
Low Voltage ◽  
Reference Value ◽  
Calibration Method ◽  
Standard Uncertainty ◽  
Relative Standard Uncertainty ◽  
Voltage Ratio ◽  
Relative Standard ◽  
Lower Uncertainty

<p class="Abstract">The article presents a method for calibration of strain gauge bridge amplifiers with improved uncertainty in low voltage ratio range. The procedure is based on combining traditional calibration of the amplifier at one point and linearity determination of the rest of the range. Traditional calibration is performed by a calibrated strain gauge bridge simulator at a reference value where measurement uncertainty is adequate, and the linearity is determined by a combinatorial calibration method with lower uncertainty, employing a special resistance circuit. Uncertainty in the lower part of the amplifier range can be significantly improved, resulting in a combined relative standard uncertainty below 2.5x10<sup>-5</sup> for the range from 0.04 mV/V to 2.5 mV/V.</p>

New requirements for power frequency electric field and induced current personal protective equipment

2020 ◽  
Vol 60 (11) ◽  
pp. 849-852
Author(s):  
Sergey Yu. Perov ◽  
Tatyana A. Konshina ◽  
Elena N. Makarova-Zemlyanskaya
Keyword(s):  
Electric Field ◽  
Personal Protective Equipment ◽  
Occupational Safety ◽  
Protective Equipment ◽  
Safety Standards ◽  
Emergency Situations ◽  
Step Voltage ◽  
Power Frequency ◽  
Staff Protection ◽  
Frequency Electric Field

In conditions of exceeding the maximum permissible levels of power frequency electric field, the staff must use personal protective equipment. Requirements for such means are regulated by the system of occupational safety standards. The goal of this work is analyzed new requirements for power frequency and induced personal protective equipment in the regulatory interstate standards GOST 12.4.172 and GOST 12.4.283. The personal protective equipment new requirements for various types of work are substantiated to electrical personnel health safety during the maintenance and operation of power grid facilities. Increasing requirements for personal protective equipment improves the staff protection at ground potential and at wire potential, including in emergency situations such as induced and step voltage.

Sign in / Sign up

Export Citation Format

Share Document