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

The Development of Precision 500/√3 kV Two-Stage Voltage Transformer with High-Voltage Excitation

2021 ◽  
pp. 1-1
Author(s):  
Hao Liu ◽  
Feng Zhou ◽  
Lixue Chen ◽  
Min Lei ◽  
Xiaodong Yin ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Transformer ◽  
Two Stage

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.

A High-Speed Fully Differential Telescopic Op-Amp for Active Filter Designs in V2X Applications

2021 ◽  
Author(s):  
Furkan Barin ◽  
Ertan Zencir
Keyword(s):  
High Speed ◽  
Low Voltage ◽  
Supply Voltage ◽  
Active Filter ◽  
Ultra Wideband ◽  
Two Stage ◽  
Fully Differential ◽  
Op Amp ◽  
Current Mirrors ◽  
Design Techniques

In this paper, an ultra-wideband fully differential two-stage telescopic 65-nm CMOS op-amp is presented, which uses low-voltage design techniques such as level shifter circuits and low-voltage cascode current mirrors. The designed op-amp consists of two stages. While the telescopic first stage provides high speed and low swing, the second stage provides high gain and large swing. Common-mode feedback circuits (CMFB), which contain five transistors OTA and sensing resistors, are used to set the first-stage output to a known value. The designed two-stage telescopic operational amplifier has 41.04[Formula: see text]dB lower frequency gain, 1.81[Formula: see text]GHz gain-bandwidth product (GBW) and 51.9∘ phase margin under 5[Formula: see text]pF load capacitance. The design consumes a total current of 11.9[Formula: see text]mA from a 1.2-V supply voltage. Presented fully differential two-stage telescopic op-amp by using low-voltage design techniques is suitable for active filter in vehicle-to-everything (V2X) applications with 120[Formula: see text][Formula: see text]m[Formula: see text]m layout area.

scholarly journals Analysis and Design of Coupled Inductor for Interleaved Buck-Type Voltage Balancer in Bipolar DC Microgrid

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2775
Author(s):  
Jung-min Park ◽  
Hyung-jun Byun ◽  
Bum-jun Kim ◽  
Sung-hun Kim ◽  
Chung-yuen Won
Keyword(s):  
Dynamic Response ◽  
Coupling Coefficient ◽  
Distribution System ◽  
Low Voltage ◽  
Magnetic Coupling ◽  
Two Stage ◽  
Dc Microgrid ◽  
Analysis And Design ◽  
Load Variation ◽  
Key Factor

A voltage balancer (VB) can be used to balance voltages under load unbalance in either a bipolar DC microgrid or LVDC (Low voltage DC) distribution system. An interleaved buck-type VB has advantages over other voltage balance topologies for reduction in output current ripple by an aspect of configuration of a physically symmetrical structure. Similarly, magnetic coupling such as winding two or more magnetic components into a single magnetic component can be selected to enhance the power density and dynamic response. In order to achieve these advantages in a VB, this paper proposes a VB with a coupled inductor (CI) as a substitute for inductors in a two-stage interleaved buck-type VB circuit. Based on patterns of switch poles under load variation, the variation in inductor currents under four switching patterns is induced. The proposed CI is derived from self-inductance based on the configuration structure that has a two-stage interleaved buck type and mathematical design results based on the coupling coefficient, where the coupling coefficient is a key factor in the determination of the dynamic response of the proposed VB in load variation. According to the results, a prototype scale is implemented to confirm the feasibility and effectiveness of the proposed VB.

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