What kind of wire system is generally used for communication power supply in communication equipment

Hello, now the normal working voltage of most of the equipment in the communication room is -48V, and the alarm voltage is about one percent.

The base station is generally equipped with two sets of -48V VRLA battery packs, calculated according to the stable discharge of 10 hours, the discharge current is C10, and the stable discharge current of the two groups of batteries is 2*C10=40A (DC load 40A), C10 is 20A, so it is enough to configure two groups of 200Ah batteries. Of course, in order to enrich the later equipment with a certain capacity, the vast majority of base stations are equipped with two sets of 300ah or 500ah batteries.

We don't consider too much margin here, just consider it according to 2 groups of 300ah, when the two groups of batteries are charged, the switching power supply must provide it with a maximum charging current of 2 * C10, which is 60A, plus 40A of the load, and the switching power supply should be configured with at least 100A capacity in this period. Most of the switching power supplies configured with base stations are PS48 50 600Ah, the output voltage is -48V, the maximum output of a single module is 50A, and the system can be configured with up to 12 modules. 600a。

Considering that the rectifier module adds a backup, and 3 modules are configured in this period, 150A should be enough.

Through the above, it can be calculated that the power of the DC power system is 48V*100A=4800W, nearly 5KW. The air conditioning power is 10kw, the lighting is 1kw, and the total power consumption of the base station is 16kw. This power is active power, and the transformer provides apparent power, and the square of apparent power = square of active power + square of reactive power.

If the power factor of the system is, the rated power of the transformer should reach 20kVA (different from the unit kW of active power). On the other hand, it is also to leave a corresponding margin.

When the mains power is off, if the air conditioner cannot be stopped, then in order to ensure the normal operation of the system, the diesel generator should also be equipped with 20kw. If the air conditioner can be stopped, then the load of the system becomes 6kw, considering that the power factor of the DC power system and the lighting system is 1 (very close), the configuration of the diesel generator to 6kw is enough.

As for the power cable, the mains entry line (from the transformer to the AC distribution box in the computer room) uses 3*16+1*10 AC power cable. The 300Ah battery cable generally uses ZR-VVR 70 square mm power cable, and the 500Ah battery cable generally uses ZR-VVR 95 square mm power cable. The distance between the communication power supply and the communication equipment is 30 meters, which is a little far, and the ZR-VVR 25 or 35 square millimeters power cable can be used.

Brother, seeing that I've worked so hard for so long, even typing is tiring, give me more points!

DC power supply. AC 380V inlet DC equipment through the rectifier module set into a DC shielded circle, while carrying the electrical load, while supplying power to the battery pack, macro collapse normal operation, AC full display switch, DC output switch, battery switch, is not disconnected, battery switch is the battery in the AC loss of power supply to the load.

Load. There are many types of DC loads, usually with high and low voltage cabinet lighting, and power operation. There are also those that protect the line. The more important communication cabinets.

Communication. Generally, the AC enters the AC cabinet and is divided into many loads through the busbar, and the load is switched to the equipment used. Some of the important communication cabinets come with UPS.

Answers]: a, b, c, d

This question examines the construction technology of traffic engineering. Single-core or multi-core power cords with a cross-section of less than 10mm2 can be directly connected to the equipment, that is, make a joint ring at the end of the wire, and the bending direction of the wire head should be consistent with the direction of the fastening bolt and nut, and a gasket should be installed between the wire and the nut to tighten the nut.

Answer]: b, c, d

The AC Luxiaoyun power supply system includes AC power supply lines, fuel generator sets, low-voltage AC distribution panels, inverters, AC uninterruptible stacks (cups) and other parts.

The DC power supply system is composed of DC distribution early beam screen, liter mu rectifier equipment, battery, DC converter CDC DC) and other parts.

DC power supply. AC rotten 380V into DC equipment through the rectifier module tuning into DC out of the nucleus, while carrying the electric load, while supplying power to the battery pack, normal operation, AC full display switch, DC output switch, battery switch, is not disconnected, battery switch is the battery in the AC loss of power when the battery to the load power.

Load. There are many kinds of DC loads, usually with high and low voltage cabinet lighting, and power operation. There are also those that protect the line. The more important communication cabinets.

Communication. Generally, the AC enters the AC cabinet and is divided into many loads through the busbar, and the load is switched to the equipment used. Some of the important communication cabinets come with UPS.

Answer]: b, c, d

Rectifier equipment and DC deficiency converter (DC, DC) are the components of the communication power supply DC system, and the large closed part is cracked.