Current transformer selection techniques for low-voltage motor control centers

2016 ◽  
Author(s):  
Scott Manson ◽  
Ashish Upreti
Keyword(s):  
Motor Control ◽  
Low Voltage ◽  
Current Transformer

scholarly journals Reach and Operating Time Correction of Digital Distance Relay

2017 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
A N Sarwade ◽  
P K Katti ◽  
J G Ghodekar
Keyword(s):  
Low Voltage ◽  
Electrical Power ◽  
Operating Time ◽  
Current Transformer ◽  
Iron Core ◽  
Electrical Power System ◽  
Voltage Transformer ◽  
Distance Relay ◽  
Correct Operation ◽  
Secondary Current

Current and voltage signals recieved from conventional iron core Current Transformer (CT) and Voltage Transformer plays very important role for correct operation of Distance Distance Relay (DDR). Increase in secondary burden connected to CT causes it to saturate at earlier stage. The saturated CT produces distorted secondary current, causing DDR to under reach and to operate by certain time delay. Rogowski Coils (RCs) are attaining increased acceptance and use in electrical power system due to their inherent linearity, greater accuracy and wide operating current range. This paper presents use of RC as an advanced measurement device suitable for DDR. Case study for validation of use of RC is carried out on low voltage system. The simulation results of Distance protection scheme used for protection of part of 220kV AC system shows excellent performance of RC over CT under abnormal conditions.

Torque Control of Stepping Motor Drivers Using Switched Linear Control Technology

2011 ◽  
Vol 58-60 ◽  
pp. 2693-2698 ◽  
Author(s):  
Jian Jun Li
Keyword(s):  
Motor Control ◽  
High Frequency ◽  
Low Voltage ◽  
Torque Control ◽  
Linear Control ◽  
Stepper Motor ◽  
Control Technology ◽  
Control Scheme ◽  
Torque Generation ◽  
Stepper Motor Control

In this paper, a new stepper motor control scheme is proposed based on switched linear control technology for better performance of motor torque generation by using an improved decay-loop and switching between high and low voltage at high frequency. The experimental results demonstrate the effectiveness of the proposed methodology.

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