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In the underground powerhouse warehouse power distribution design, 72 sets of wind turbines at the southern end of the warehouse are used as exhaust and exhaust fans, which are first-class loads. Considering that there are many fans and the distribution distance is far, if the end switch box is installed in each fan in the conventional way, the power distribution mode is complicated and it is not conducive to centralized management. Therefore, according to the concept of centralized control of the electric control room in the subway (that is, centralized distribution and control of the fan and damper of the HVAC, and the ring-controlled electronic control room as the terminal switching box), the side span of the Kunan end is used. Three power distribution rooms were used to realize the distribution of 72 fans at the southern end.
Each fan corresponds to one power distribution cabinet drawer chamber, that is, each fan corresponds to one power distribution circuit, the control circuit is set in the power distribution drawer, and the single loop power source is led to the fan.
Among them, two power distribution rooms are responsible for the distribution of 28 fans; the other is responsible for the distribution of 16 fans. The power supply of the power distribution room is led by a 35/0.4kV substation next to the operation library. Two power supplies are connected through the waterproof enclosed bus. Two power distribution rooms share two power sources.
The exhaust fan and the exhaust fan at the north end of the warehouse are used to set up the dispersion. Therefore, according to the load level, a dual power switch box is arranged near the exhaust fan.
The general control box power distribution is set near the exhaust fan, and the power supply is led by the relatively close 35/0.4kV substation through the cable to lead the 1 or 2 power supply, and the power is distributed according to the common power supply principle of the similar switch box.
Food additives are substances added to food to preserve flavor or enhance its taste, appearance, or other qualities. Some additives have been used for centuries; for example, preserving food by pickling (with vinegar), salting, as with bacon, preserving sweets or using sulfur dioxide as with wines. With the advent of processed foods in the second half of the twentieth century, many more additives have been introduced, of both natural and artificial origin.
Food additives can be divided into several groups, although there is some overlap because some additives exert more than one effect. For example, salt is both a preservative as well as a flavor.
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