Feeder terminal unit (FTU) power supply

Abstract

The invention provides a feeder terminal unit (FTU) power supply which comprises a voltage transformer PT connected with a 10-kilovolt line. The output end of the voltage transformer PT is connected with an alternating-current transformer T through preceding stage protective resistor NR1-NR3. A secondary side of the alternating-current transformer T after being rectified and filtered through a rectifier bridge BR1 and a capacitor C1 is respectively connected with a direct current (DC) / DC voltage-stabilized power supply and a charge-discharge module. The FTU power supply has the advantages of being simple in structure, and capable of meeting requirements of equipment on a foot column to the power supply, and ensuring working performance of a feeder line distant terminal of distribution network automation terminal equipment. When the line is switched on, the DC / DC voltage-stabilized power supply provides a working power supply for the FTU, the input side is an alternating-current (AC) 220-volt electricity feeder line terminal unit power supply, and a 10-kilovolt line voltage PT (10 KV / 220V) is adopted to obtain electricity. Output voltage of the secondary side of the PT is reduced and rectified through a transformer, and provides direct current supply for a feeder line terminal unit, and electric energy is stored through the charge-discharge module connected with a direct current main loop in parallel. When the line is switched off, the charge-discharge module serving as a reserved power supply for the FTU enables a maintenance device to operate about 80 seconds after the power is off.

Description

technical field [0001] The invention relates to a power supply for FTU. Background technique [0002] The pole-mounted switchgear is installed outdoors and is subjected to harsh operating environments. The harsh working conditions include: ambient temperature of -40°C~70°C; external environments such as wind and sand, rain, fog, and corrosion; The device has strict requirements on the power supply. According to the definition of power industry standards, distribution network automation terminal equipment feeder remote terminal FTU (Feeder terminal unit), the main functions are fault detection, local protection control, status monitoring, remote control and power measurement, and communication with the main station of the distribution automation system center . Judging the fault location, isolating the fault section, and restoring the normal area consume a lot of power, and the equipment itself cannot maintain the energy required for the accident opening, which reduces the ...

AI Technical Summary

Problems solved by technology

However, if the battery runs for a long time without maintenance, the performance cannot be maintained.

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