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Knowledge of common low - voltage distribution
Time:2017-10-31Editor:cqyaoyangHits:
One, and the cabinet
Second, ATS automatic conversion cabinet
Third, the capacitor compensation cabinet


One, and the cabinet:
1, what is the cabinet?
When two or more generators together to load the power supply, you need to install the generator and machine cabinet, the system can meet the requirements of the joint power supply, so that the power supply system to work properly. And the cabinet is to let more than one generating units combined power supply equipment.

2, and what are the benefits of the cabinet?
 (1), improve the power supply system reliability, continuity. Because the multi-unit parallel into a power grid, the power supply voltage and frequency stability, can withstand the impact of greater load changes. At the same time not because of a certain or part of the equipment failure caused by the entire system power supply interruption.
(2), maintenance, maintenance more convenient. Multiple units in parallel use, you can focus on scheduling, you can shut down the need for maintenance or faulty generator sets for maintenance or repair without interruption of power supply.
(3), more economical. Can be based on the size of the online load, put the appropriate number of small power units to reduce the high-power unit to bring the operation of small fuel, oil waste.
(4), to facilitate the future increase in capacity. Only need to install the power required for power generation and parallel equipment, to be the future companies need to expand the capacity of the grid, then increase the generating units, and can easily achieve the expansion unit and machine. Has achieved the purpose of reducing costs.

3, different generating units to meet the conditions to be able to machine?
(1), the voltage is equal;
(2), the frequency is equal;
(3), phase sequence consistent;
(4), phase equal;
(5), the output characteristics are equal;
Only to meet the above five basic conditions can be parallel machine.

4, and the type of cabinet:
(1), manual and machine: the use of light or synchronous table instructions, the method is generally used for mechanical speed control of the old diesel generator;
(2), semi-automatic and machine: automatic and machine, manual solution, generally used for factory main or standby power supply;
(3), automatic and machine: power failure, automatically start 2 or more generating units, and the machine after the load to the power supply, electricity recovery, automatic solution, the unit automatically shut down, generally used for building spare power;
(4), peaking and the machine (automatic and machine): in the automatic and cabinet on the basis of changes in the size of the load, and the cabinet to complete multiple units of automatic input and machine, automatic solution and shutdown logic function ;
(5), three remote machine system: the use of a dedicated machine and machine system, complete and the cabinet and the generator with the PC's communication connection of the parallel system. Can achieve remote and machine function.

5, and the cabinet specifications:
 Generators and cabinet specifications are generally: 250A 400A 630A 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A

6, how to determine and cabinet specifications?
 Is determined by the maximum output current of the generator set, which is generally estimated by multiplying the generator set standby power (KW) by two. For example: a standby 310KW generator sets, and the cabinet specifications are: 310 × 2 = 620A, no 620A specifications, so we choose 630A and the cabinet.

7, how to determine the number of cabinets?
 Each generating unit is equipped with a cabinet and cabinet.

Second, ATS automatic conversion cabinet (dual power automatic conversion system)

1, what is the ATS automatic conversion cabinet? What function?
  For power systems with more stringent power interruption, the mains / generators should be switched automatically. ATS automatic conversion cabinet can achieve two-way power automatic conversion, that is, when the main power failure or failure, the standby power supply automatically return to normal power supply, and automatically restored to the main power supply.
If the original supply system if the mains, when the power failure or three-phase phase, undervoltage, the automatic switching system automatically start the generator set immediately after the start of the generator, the voltage frequency after the normal load power supply, when the electricity returned to normal Automatically switch to the mains power supply, delay stop generator sets.
The original supply system for the generating units, when the generator failure in case of failure, the automatic switching system immediately cut off the power supply and automatically switch to the mains power supply. In order to achieve the power supply system for rapid recovery and unattended function. Thus maintaining normal power supply.

2, ATS specifications are:
Generators ATS cabinet specifications are generally: 125A 160A 250A 400A 630A 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A and so on.


3, how to determine the ATS cabinet specifications?
 Is determined by the maximum output current of the generator set, which is generally estimated by multiplying the generator set standby power (KW) by two. For example: a standby 310KW generator set, and the cabinet specifications are: 310 × 2 = 620A, no 620A specifications, so we choose 630A ATS cabinet.

Third, the capacitor compensation cabinet
1, what is the capacitor compensation cabinet
1, the power system in the load type most of the emotional load, coupled with the widespread use of electricity in the power of electronic equipment, so that the power grid power factor is low. The lower power factor reduces device utilization, increases power investment, damages voltage quality, reduces device life, and greatly increases line losses. In order to improve the energy wastage caused by the low power factor of the grid and the factors of these unfavorable power supply production, the power factor of the grid must be effectively improved. Obviously, these reactive power is usually unreasonable if it is provided by the generator and transmitted over long distances. Reasonable way is to produce reactive power in the place where the reactive power, that is, increase the reactive power compensation equipment and devices.
2, the role of capacitance and capacitance compensation cabinet:
(1), reactive power compensation cabinet for low-voltage power grid reactive power compensation to improve the power factor of the grid, reduce line losses, improve power quality.
(2), you can pay less electricity.
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