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 Modeling Capacitive Low-Power Voltage Transformer Behavior over Temperature and Frequency

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1719
Author(s):  
Alessandro Mingotti ◽  
Federica Costa ◽  
Gaetano Pasini ◽  
Lorenzo Peretto ◽  
Roberto Tinarelli
Keyword(s):  
High Frequency ◽  
Renewable Energy Sources ◽  
Electronic Devices ◽  
Measurement Instruments ◽  
Voltage Measurement ◽  
Voltage Transformer ◽  
Medium Voltage ◽  
Wide Range ◽  
Power Frequency ◽  
Intelligent Electronic Devices

The use of capacitive dividers (CDs) in medium-voltage (MV) networks started as simple voltage detectors and as rough voltage measurement instruments for protective purposes. Now, with the spread of intelligent electronic devices and renewable energy sources at the distribution level, capacitive dividers are designed and installed to perform accurate voltage measurements. Such a requirement is mandatory when the power quality has to be assessed. Therefore, CDs are currently being used either for power frequency or for high-frequency (supraharmonic- or partial-discharge-level) measurements. In this paper, typical off-the-shelf CDs are studied and modeled to understand how they behave in a wide range of frequencies and when the temperature varies. To this purpose, specific setups and tests have been developed and performed. From the results, it is clear that with proper modeling of CDs, it is possible to exploit them for measuring phenomena in a wide range of frequencies, including the effects due to temperature variations and self-resonances.

A Laser Sensor Technique for Measuring 3D Surfaces Based on the Polarized Heterodyne Astigmatic Principle

2005 ◽  
Vol 295-296 ◽  
pp. 483-488
Author(s):  
L.R. Qiu ◽  
X.M. Ding
Keyword(s):  
Optical Sensing ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Laser Source ◽  
Profile Measurement ◽  
Laser Sensor ◽  
Sensing System ◽  
3D Surface ◽  
Measuring Machine ◽  
Better Than

A laser measurement technique based on polarized heterodyne astigmatic principle is proposed for high precision three-dimensional (3D) profile measurement. In the presented system, the defocus astigmatic signal coming from the polarized reflection of the detected 3D surface is used to determine the position of the surface. The work of tracing, scanning and processing of the detected 3D surface is performed by combining the system with an ultra precision laser coordinate measuring machine (CMM). Compared with the current heterodyne astigmatic measuring technique, a polarization incidence and Glan-Thompson prism (GP) is used in the novel polarized heterodyne astigmatic measuring method. The anti-interference ability of the optical sensing system is significantly improved. The undesired influence on the measurement results, caused by fluctuation of surrounding brightness, by the intensity disturbance of the laser source, and by the multi-reflection among optical elements, is effectively restrained. Experimental results show that the stability of the optical sensing system is better than 2%. The resolution of the system is better than 0.005µm.

Performance Test for Nanometer Accuracy Capacitance Displacement Sensor

2014 ◽  
Vol 609-610 ◽  
pp. 898-902 ◽  
Author(s):  
Jian Jun Cui ◽  
Xing Hua Qu ◽  
Yan Hui Kang
Keyword(s):  
Performance Test ◽  
Performance Testing ◽  
Capacitive Sensor ◽  
Measuring Method ◽  
Test Method ◽  
Displacement Sensor ◽  
Capacitance Sensor ◽  
Measurement Capability ◽  
Linearity Test ◽  
Better Than

In checking to see the performance of the nanometer accuracy capacitive sensor, some parameters, such as, the linearity, repeatability and so on are presented as the characterization parameters. Firstly, the series of test method and test devices is designed to measure and evaluate these parameters of a capacitance sensor. Secondly, the measuring setup is consisted by the traceable laser interferometer with high accuracy and nanometer micro-motion system. Finally, in order to meet the displacement linearity test, the measuring method is in line with the Abbe principle. Experimental results indicate that this approach and setup can realize in the best reference line to the minimum linearity is better than 0.01%, repeatability is better than that of 3.5nm, resolution is less than 0.3nm, measurement capability is more unwavering than 3nm. It can satisfy the measurement requirements of capacitance sensor performance testing with nanometer accuracy.

Voltage Ratio Traceability of 10 kV Low-Voltage Excited Two-Stage Voltage Transformer

2017 ◽  
Vol 66 (6) ◽  
pp. 1405-1410 ◽  
Author(s):  
Huanghui Zhang ◽  
Haiming Shao ◽  
Jiafu Wang ◽  
Wei Wang ◽  
Feipeng Lin ◽  
...  
Keyword(s):  
Low Voltage ◽  
Voltage Transformer ◽  
Two Stage ◽  
Voltage Ratio

scholarly journals Accurate Estimation of Frequency-Dependent Losses in High Voltage Test Transformers for the Assessment of Electric Discharge Powers

2019 ◽  
Vol 63 (3) ◽  
pp. 191-201
Author(s):  
Kada Laroussi ◽  
Samir Flazi
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Electrical Discharge ◽  
Voltage Source ◽  
Total Power ◽  
Accurate Estimation ◽  
Iron Core ◽  
Voltage Measurement ◽  
Voltage Transformer ◽  
Décharge Électrique

The work presented in this paper is related to the project GEMUDE (Genérateur Multifonction de Décharge Electrique) which aims to design a universal high-voltage generator for electrical discharge studies. To design this variable high voltage source that operates in the frequency range of 0 to 1 kHz, the assessment of transformer losses represents a crucial phase during the design process. These losses in the coils and iron core of the transformer are closely related to the frequency and nature of the materials used. This paper presents a comparative study of transformer losses using analytical methods and experimental calorimetry measurements. Steinmetz empirical formula is used to estimate magnetic core losses whereas coil losses are evaluated by solving Maxwell equations. The main goal is to control these losses to limit the internal temperature rise in the transformer through the implementation of an efficient cooling solution. The results obtained by the analytical method were satisfactory which confirm the feasibility of measuring the power absorbed by the various electrical discharge devices upstream of the high-voltage transformer. This is because it turns out that the power of the generator in charge is the total power of the electric discharge and the transformer losses. This method, termed Power Disparity Method (PDM). In this paper, it is an easy and reliable way as compared with high voltage measurement methods.

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