Alternating current power supply system for substation

Abstract

The invention provides an alternating current power supply system for a substation. The system comprises two transformers, two breakers and a three-position change-over switch, wherein the upper portion of each of two breakers is connected to one of the transformers, the upper portion of the three-position change-over switch is connected to the two breakers respectively, and the lower portion of the three-position change-over switch is connected to two sections of alternating current buses. The three-position change-over switch replaces two Automatic Transfer Switches (ATS) in the prior system, two transformers run in a dual active and separated mode, the problem that the system may fail to achieve the dual active mode and the circumfluence reliably is avoided effectively, the system is simplified and the reliability of the operation of the system is improved.

Description

technical field [0001] The invention relates to an AC power supply system for a substation, belonging to the field of power distribution. Background technique [0002] Substation power supply is an important part of the substation, generally divided into AC system, DC system, communication power system, UPS and so on. The substation uses AC power to power the entire substation for charging, ventilation, lighting, power, cooling, energy storage for circuit breakers, and other electrical equipment that uses AC power. With the continuous improvement of substation equipment manufacturing technology and the promotion of unattended substations, higher requirements are put forward for the safety, reliability, economy and automation of substation AC power systems. [0003] The power supply for substations should always be researched and developed based on system technology, and development ideas should be put forward according to practical problems and development status. The exis...

AI Technical Summary

Problems solved by technology

However, if the conversion of two ATSs is not synchronized, that is, one of the ATSs is successfully converted to the 2# transformer, but the other ATS fails to be converted or the conversion has a certain delay compared to the 1# ATS, the mutual backup mode cannot be reliably implemented, and If there is a tie switch between the two sections of AC bus, it will cause a circulating current between the two sections of AC bus. When the circulating current is large, it will cause a certain impact on the system, and if it is serious, it will damage the equipment, burn the transformer or cause a malfunction of the overcurrent protection.

[0005] In view of this, the present invention provides an AC power system for substations. By using a three-position transfer switch instead of two ATSs, it effectively avoids the possibility that the existing AC power systems for substations cannot reliably realize mutual backup mode and circulation. problems, while simplifying the system and improving the reliability of system operation

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