Basic knowledge of communication power supply

The communication power supply is an important part of the entire communication system, just like the heart of the human body, the power supply quality and reliability of the power supply equipment will directly affect the entire communication system and its quality.

Communication power supply equipment and facilities mainly include: AC mains lead-in lines, high and low voltage power supply and distribution equipment, diesel generator sets, rectifiers, battery packs, DC converters, UPS, and various AC and DC power distribution panels, etc., forming a Complete power supply system, reasonable control, distribution, transmission, to meet the requirements of communication equipment.

Generally, the input voltage of the substation of communication enterprises is 10KV, so the high voltage transmission of high voltage transmission needs to be reduced to 10KV from 35KV to 220KV to the telecommunications enterprises.

The role of high and low voltage power distribution system equipment: to introduce high voltage (10KV) into the high voltage incoming cabinet, metering cabinet, lightning arrester, and outgoing cabinet to the high voltage side of the transformer.

The role of low-voltage power distribution equipment: the outgoing line from the low-voltage side of the transformer enters the low-voltage incoming line cabinet, passes through the capacitor compensation cabinet and several outgoing line cabinets, and the function is to concentrate and distribute electric energy.

Low-voltage (380/220) power distribution cabinet (screen)/low-voltage switchgear is a device that connects step-down transformers, low-voltage power sources and AC loads. It can complete the conversion of mains power and backup power, load shunting, protection, measurement, alarm, etc. Features.

Low-voltage (380/220) power distribution cabinet (screen)/low-voltage switchgear is a device that connects step-down transformers, low-voltage power sources and AC loads. It can complete the conversion of mains power and backup power, load shunting, protection, measurement, alarm, etc. Features.

Function introduction of each part

Substation: 10KV (6KV) is introduced from the mains to the high-voltage power distribution system cabinet (incoming line, measurement, and outgoing line)-transformer (step down to 380V)—low-voltage power distribution cabinet (incoming line, compensation, and outgoing line distribution).

Oil engine generator set: As a backup power source for the mains, output 380V AC power to the low-voltage power distribution cabinet to switch with the mains through a switch.

AC power distribution panel: distribute 380/220V AC power.

Rectifier: rectify 380/220V AC and transform it into -48V DC.

DC power distribution panel: distribute -48V DC power to each communication room equipment DC power distribution panel or DC electrical equipment.

UPS power supply: Provide uninterrupted AC power supply. Output 220V/380V AC power.

Storage battery: provide AC and DC backup power supply, provide -48V power supply for rectifier; provide 380/220V power supply for UPS.

DC converter: convert -48V power supply into DC power supply of different voltage levels required by the equipment, for example: -12V, -24V, +60, -60V, 110V, etc.