Research on Dynamic Characteristics of 10kv Three-Core Cable Layers of Material Thermal Resistance

2014 ◽  
Vol 1008-1009 ◽  
pp. 588-592
Author(s):  
Wen Xiang Li ◽  
Rui Bo Su ◽  
Gang Liu ◽  
Peng Wang ◽  
Zhen Ning Pan
Keyword(s):  
Steady State ◽  
Thermal Resistance ◽  
Dynamic Characteristics ◽  
Temperature Rise ◽  
Resistance Coefficient ◽  
Circuit Model ◽  
Cable Structure ◽  
Thermal Circuit ◽  
Current Measuring ◽  
Conductor Temperature

The paper focus on the influence of the deviation of material thermal resistance coefficient on the conductor temperature calculations, based on the three-core cable thermal circuit model. Meanwhile we also design a temperature rise test of the 10kv three-core cable in step current, measuring the temperature of the cable structure in different steady state. Then we calculate the thermal resistance of the cable body and the thermal resistance of the layer material , find the change law of the thermal resistance with the temperature and analyses the effect of the dynamic characteristic of the material thermal resistance on the conductor temperature calculations in the three-core cable thermal circuit model.

Study on the Steady State Thermal Circuit Model of 10kV Three-Core Cable Based on the Shape Factor Method

2014 ◽  
Vol 1008-1009 ◽  
pp. 593-597
Author(s):  
Wen Xiang Li ◽  
Rui Bo Su ◽  
Gang Liu ◽  
Peng Wang ◽  
Yi Xuan Chen
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Shape Factor ◽  
Field Research ◽  
Circuit Model ◽  
The Finite Element Method ◽  
Heat Transfer Characteristics ◽  
Thermal Circuit ◽  
The Core ◽  
Conductor Temperature

The core of the 10kV three-core cable is in the shape of a trefoil. Not all the radial direction of the actual heat transfer characteristics are the same. The finite element method serve as the three core cable temperature field research method in this text, in order to analyze the internal temperature distribution of three core cable, establish a steady state thermal circuit model in accordance with the characteristics of heat transfer from the cable conductor to the surface in the three-core cable , give the calculation of conductor temperature algorithm, and calculate the various parameters in the model.

scholarly journals Real-time calculation of three core cable conductor temperature based on thermal circuit model with thermal resistance correction

2019 ◽  
Vol 2019 (16) ◽  
pp. 2036-2041
Author(s):  
Qinghua Zhan ◽  
Jiangjun Ruan ◽  
Ke Tang ◽  
Liezheng Tang ◽  
Yijun Liu ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Real Time ◽  
Circuit Model ◽  
Thermal Circuit ◽  
Time Calculation ◽  
Conductor Temperature

Circuit Representation of Three-Phase Bridge Convertors

1988 ◽  
Vol 25 (4) ◽  
pp. 351-360 ◽  
Author(s):  
D. B. Watson
Keyword(s):  
Motor Control ◽  
Steady State ◽  
State Power ◽  
Circuit Model ◽  
Variable Frequency ◽  
Circuit Representation ◽  
Three Phase ◽  
Model Circuit

The paper shows that the three-phase bridge convertor can be represented in the steady state by a circuit model. Circuit models are deduced for naturally commutated and forced commutated convertors. Steady state power rectification, inversion, the d.c. link, and variable frequency motor control are described.

Study of Temperature Effect on Servovalve-Controlled Fuel Metering Unit

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Bin Wang ◽  
Haocen Zhao ◽  
Ling Yu ◽  
Zhifeng Ye
Keyword(s):  
Steady State ◽  
Temperature Variation ◽  
Dynamic Characteristics ◽  
Numerical Study ◽  
Step Response ◽  
Fuel Temperature ◽  
Wide Range ◽  
Fuel Rate ◽  
Testing Condition ◽  
The Given

It is usual that fuel system of an aero-engine operates within a wide range of temperatures. As a result, this can have effect on both the characteristics and precision of fuel metering unit (FMU), even on the performance and safety of the whole engine. This paper provides theoretical analysis of the effect that fluctuation of fuel temperature has on the controllability of FMU and clarifies the drawbacks of the pure mathematical models considering fuel temperature variation for FMU. Taking the electrohydraulic servovalve-controlled FMU as the numerical study, simulation in AMESim is carried out by thermal hydraulic model under the temperatures ranged from −10 to 60 °C to confirm the effectiveness and precision of the model on the basis of steady-state and dynamic characteristics of FMU. Meanwhile, the FMU testing workbench with temperature adjustment device employing the fuel cooler and heater is established to conduct an experiment of the fuel temperature characteristics. Results show that the experiment matches well with the simulation with a relative error no more than 5% and that 0–50 °C fuel temperature variation produces up to 5.2% decrease in fuel rate. In addition, step response increases with the fuel temperature. Fuel temperature has no virtual impact on the steady-state and dynamic characteristics of FMU under the testing condition in this paper, implying that FMU can operate normally in the given temperature range.

Sign in / Sign up

Export Citation Format

Share Document