UPS is a kind of energy conversion device which uses battery chemical energy as backup energy to continuously provide electric energy for equipment in case of power failure or abnormal grid failure. We call it Uninterruptible Power Supply (Abbreviated as UPS). UPS can be divided into backup UPS, online interactive UPS and online Dual-Transform UPS according to different working modes.
Wuhan Metro is currently using Kehua UPS, which is an online Dual-Transform power supply system with uninterrupted power frequency. The UPS signal power supply system of Wuhan Metro works uninterruptedly all year round. Whether it can prolong the service life is an important means to measure the maintenance level of technicians and power managers [1]. UPS, which is used in conjunction with intelligent power supply screen, has become an important part of urban rail transit power supply system. Therefore, the efficiency of daily maintenance and fault handling of UPS directly affects the working efficiency of the signal system. This paper will clarify the daily maintenance content of Kehua UPS, and propose common fault information and fault handling steps of Kehua UPS. According to the steps of fault treatment, the fault can be eliminated in the shortest time, so that the Kehua UPS can quickly resume its normal working state.
With the rapid development of Urban Rail Transit, the demand and service quality of communication system for the subway is higher and higher. Good communication system is an important factor to ensure the safe operation of Urban Rail Transit. Telephone Communication is the basic hand of train command in Urban Rail Transit, including public telephone and private telephone. At present, SPC Exchange Technology is adopted in public telephone and private telephone system in Urban Rail Transit while domestic essential equipment suppliers such as ZTE, Huawei and other companies, declared phasing out the production of SPC Exchange Equipment. Thus, a new idea would be put forward to solve this problem. Soft-switch Technology can support various forms of information. It is a new network technology which integrates voice, data, image and fax services. Soft-switch technology as a representative of scientific and technological innovation can be effectively integrated with Urban Rail Transit Communication System. And the quality of communication service can also be improved. Taking Wuhan Metro as an example, this paper discusses Soft-switch technology and its application in urban rail transit communication system. After successful pilot, it can be extended to other cities.
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