Title:
Study on Temperature Rise Characteristics of Contact Failure of Tulip Contacts of Medium-voltage Switchgear
Author(s):
SUN Tao ,ZHAO Lihua ,LONG Chen ,WANG Zelong ,REN Junwen ,HUANG Xiaolong
Unit:
（College of Electrical Engineering ,Sichuan University ,Chengdu 610065 ,China）
Keywords:
switchgear ;tulip contacts ;contact failure ;temperature rise characteristics ;modeling simulation
Abstract:
The heating problem due to contact failure of tulip contact of medium voltage switchgear will significantly affect electrical and insulation performance of the switchgear and cause a hidden danger to the safe and stable operation of the power system. In order to explore the temperature rise problem of MV switchgear, the temperature filed and flow field coupling MV switchgear model with complete tulip contacts structure is set up in this paper. The finite element analysis method is used to simulate and analyze the temperature field and flow field distribution in MV switchgear under normal conditions and tulip contacts failure. The results show that under normal case the highest temperature rise of the medium-voltage switchgear is in the contact of circuit breaker, and the air circulation flow direction inside the switchgear will cause the temperature rise of three-phase conductor to have difference. The temperature rise of the the fault point of tulip contacts in the case of contact fault is the highest. The influence of the fault on the temperature rise of the switchgear is bigger, but on the flow field is smaller.
