Title :
400 V/1000 kVA Hybrid Automatic Transfer Switch
Author :
Bing Tian ; Chengxiong Mao ; Jiming Lu ; Dan Wang ; Yu He ; Yuping Duan ; Jun Qiu
Author_Institution :
State Key Lab. of Adv. Electromagn. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A lot of large-scale industrial critical loads suffer from voltage interruptions and sags which can cause a significant financial loss. The thyristor-based solid-state transfer switch (STS) and mechanical-based automatic transfer switch (ATS) are used to protect loads against these power quality problems. However, the STS has a great deal of loss consumption because of the forward voltage drop of the thyristors, and ATS can hardly satisfy the voltage-sensitive load due to the long transfer time. This paper proposes a 400 V/1000 kVA hybrid ATS (thyristor switch in parallel with mechanical switch) (HATS) to realize low power consumption under normal situation and transfer fast when required. The proposed HATS has four transfer strategies which can be chosen according to different applications, it realizes the overlapping transfer of the neutral wire, and it can make a decision to transfer or not according to the different fault locations (transfer on the source side and not transfer on the load side). The design details of the prototype are presented, and laboratory tests and field experiments show the prototype good performance.
Keywords :
power supply quality; thyristors; fault locations; financial loss; forward voltage drop; hybrid automatic transfer switch; mechanical switch; mechanical-based automatic transfer switch; power quality; thyristor switch; thyristor-based solid-state transfer switch; voltage 400 V; voltage interruptions; voltage sags; Circuit faults; Fault location; Switches; Switching circuits; Thyristors; Voltage fluctuations; Wires; Hybrid transfer switch; power quality; power supply reliability; transfer switch;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2013.2238872