scholarly journals Temperature Rise Characteristics and Error Analysis of a DC Voltage Divider

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1914
Author(s):  
Zhengyun Fang ◽  
Yi Luo ◽  
Shaolei Zhai ◽  
Bin Qian ◽  
Yaohua Liao ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Measurement Accuracy ◽  
Heat Dissipation ◽  
Performance Indicator ◽  
Voltage Divider ◽  
Internal Resistance ◽  
Working Time ◽  
Internal Temperature ◽  
Dc Voltage ◽  
High Voltage Direct Current

Measurement accuracy is an important performance indicator for high-voltage direct current (HVDC) voltage dividers. The temperature rise effect for a HVDC voltage divider’s internal resistance has an adverse effect on measurement accuracy. In this paper, by building a solid model of a DC voltage divider, the internal temperature rise characteristic and error caused by the temperature rise in a resistance voltage divider were theoretically simulated. We found that with the increase in height and working time, the internal temperature of the voltage divider increased. The results also showed that the lowest temperature was near the lower flange and the highest temperature was near the upper flange in the middle of the voltage divider. The error caused by the temperature rise increased first and then decreased gradually with divider height, increasing with its working time. The measurement error caused by the internal temperature difference in steady state reached a maximum of 158.4 ppm. This study provides a theoretical basis to determine the structure and accuracy improvement for a resistive voltage divider, which is helpful for the selection of components and the optimization of the heat dissipation structure.

Blocking Analysis of HVDC Caused by DC Voltage Divider with OPDL System

2011 ◽  
Vol 354-355 ◽  
pp. 993-997
Author(s):  
Xing Qi He
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Architectural Design ◽  
Voltage Divider ◽  
Transmission System ◽  
Dc Voltage ◽  
High Voltage Direct Current ◽  
Current Voltage ◽  
Direct Current Voltage ◽  
Blocking Analysis

A blocking accident was described which was caused by the architectural design bug of high-voltage direct current voltage divider. The bug of DC voltage divider architecture design was pointed out through the analysis, and the appropriate solutions for the similar bug or hidden trouble in high-voltage DC transmission system was proposed.

Correction of temperature measurement accuracy affected by internal temperature rise in uncooled thermal imager

2018 ◽  
Vol 11 (4) ◽  
pp. 669-676
Author(s):  
张艳超 ZHANG Yan-chao ◽  
高策 GAO Ce ◽  
刘建卓 LIU Jian-zhuo ◽  
王博 WANG Bo ◽  
杨帅 YANG Shuai
Keyword(s):  
Temperature Measurement ◽  
Temperature Rise ◽  
Measurement Accuracy ◽  
Thermal Imager ◽  
Internal Temperature

Stress Analysis of a Tire Under Vertical Load by a Finite Element Method

1977 ◽  
Vol 5 (2) ◽  
pp. 102-118 ◽  
Author(s):  
H. Kaga ◽  
K. Okamoto ◽  
Y. Tozawa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Program ◽  
Temperature Rise ◽  
Strain Energy ◽  
Internal Stresses ◽  
Vertical Load ◽  
The Finite Element Method ◽  
Internal Temperature ◽  
Element Method

Abstract An analysis by the finite element method and a related computer program is presented for an axisymmetric solid under asymmetric loads. Calculations are carried out on displacements and internal stresses and strains of a radial tire loaded on a road wheel of 600-mm diameter, a road wheel of 1707-mm diameter, and a flat plate. Agreement between calculated and experimental displacements and cord forces is quite satisfactory. The principal shear strain concentrates at the belt edge, and the strain energy increases with decreasing drum diameter. Tire temperature measurements show that the strain energy in the tire is closely related to the internal temperature rise.

scholarly journals A Novel Voltage Divider Circuit

2012 ◽  
Vol 2 (5) ◽  
pp. 278-280 ◽  
Author(s):  
K. C. Selvam ◽  
S. Latha
Keyword(s):  
Voltage Divider ◽  
Acceptable Level ◽  
Dc Voltage ◽  
The Third

A novel analog divider is described in this paper. The circuit enables the division of a dc voltage with another dc voltage. The constant of the division is dependent upon a third dc voltage and a pair of resistors. Employing a precision source for the third dc voltage and matched resistors, an acceptable level of accuracy can be obtained.

Thermal Analysis and Test for a High Speed PM Machine for Fan Application

2011 ◽  
Vol 383-390 ◽  
pp. 4727-4734 ◽  
Author(s):  
Ji Qiang Wang ◽  
Feng Xiang Wang
Keyword(s):  
Thermal Analysis ◽  
Temperature Rise ◽  
Power Loss ◽  
High Speed ◽  
Heat Dissipation ◽  
Machine Design ◽  
Test Results ◽  
Power Losses ◽  
Running Speed ◽  
High Speed Machine

For a give air flux, the higher speed the fanner is running, the smaller the fanner’s size is. It is also well known that for a given power, the higher the machine’s running speed, the smaller the machine’s size has. If the fanner is geared to a high speed machine directly, the fan set’s volume will be sharply decreased. However, the heat dissipation of the high speed machine becomes a serious problem also due to the small size and high power loss density. Therefore, how to estimate accurately the power losses and temperature rise is a key issue for the high speed machine design. In this paper, the power losses and temperature of high speed PM machine for a fanner application are thoroughly investigated. And the test results of a prototype fan set partly shown the validity of the calculation method.

scholarly journals Study on the Method of Calculating Temperature Rise of Transformer

2020 ◽  
Vol 179 ◽  
pp. 01027
Author(s):  
Tao Li ◽  
Xiaoping Du ◽  
Xuewu Sun ◽  
Yuanyuan Song
Keyword(s):  
Temperature Rise ◽  
Thermal State ◽  
Hot Spot ◽  
Scientific Basis ◽  
Internal Temperature ◽  
Insulation Aging ◽  
The Neural Network ◽  
Forecasting Method ◽  
Transformer Winding ◽  
Spot Temperature

The internal temperature of the transformer is a key parameter to measure the thermal state of the transformer. The service life of the transformer generally depends on the life of the insulating material, and high temperature is the main reason why cause insulation aging, this paper studies the temperature rise of transformer winding hot spot temperature for the key, using the neural network forecasting method, forecasts transformer winding hot spot temperature change rule, calculate the transformer internal temperature rise, provide the temperature of the scientific basis for the safe operation of the transformer.

scholarly journals A new method to calculate the friction coefficient of ball screws based on the thermal equilibrium

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882073
Author(s):  
Lu-Chao Zhang ◽  
Li Zu
Keyword(s):  
Friction Coefficient ◽  
Temperature Rise ◽  
Thermal Equilibrium ◽  
Heat Dissipation ◽  
Mechanical Efficiency ◽  
New Method ◽  
Measuring System ◽  
Ball Screw ◽  
Heat Absorption ◽  
Screw Mechanism

Based on the theory of thermal transmission, this article provides a new method to acquire the friction coefficient in ball screw mechanism. While the screw is in thermal equilibrium, the heat absorption is equal to the heat dissipation. The heat absorption is able to be achieved by calculating the heat energy due to the friction at the contact area and the heat dissipation can be calculated by the law of thermodynamics. When the temperature rise is determined, the heat dissipation can be obtained and the friction coefficient in ball screw mechanism can be calculated further. In order to confirm the validity of this method, a measuring system is constructed to obtain the temperature rise of ball screws. The experimental results show that the temperature rise has the same tendency with the theoretical values depending on this model. Therefore, it can be exploited to predict the temperature rise of ball screws in the rated life cycle when the ball screw is under the condition of thermal equilibrium. Furthermore, this model can be used to evaluate the mechanical efficiency, which is an important parameter for the performance of the ball screw.

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