Containerized energy storage system

Containerized energy storage system , also known as pre-installed substation or pre-installed substation. Is a high-voltage switchgear, distribution transformer and low-voltage distribution device, according to a certain wiring scheme arranged into one of the factory prefabricated indoor and outdoor compact distribution equipment, that is, transformer step-down, low-voltage distribution and other functions organically combined together, installed in a moisture, rust, dust, rat, fire, anti-theft, heat insulation, fully enclosed, movable steel structure box. It is especially suitable for urban network construction and transformation, and it is a new substation that rises after civil substation. Box-type substation is suitable for mines, factories, oil and gas fields and wind power stations, it replaces the original civil distribution room, distribution power station, and becomes a new complete set of transformer and distribution equipment.

European-style box
1. Box structure:

The box of European-style substation is composed of three parts: base, shell and top cover. The base is generally made of channel steel, Angle steel, flat steel, steel plate, etc., which is welded or fixed and formed by bolted connection; In order to meet the needs of ventilation, heat dissipation and inlet and outlet lines, strip holes and moderately sized circular holes should also be opened at the corresponding positions. The box shell, top cover channel steel, Angle steel, steel plate, aluminum alloy plate, color steel plate, cement board, etc. are bent, welded or connected with screws, hinges or related special accessories.

Regardless of the kind of material of the box transformer shell, according to the standard requirements must have: sun protection, rain prevention, dust prevention, rust prevention, small animals (such as snakes) and other entry of the five prevention functions. In order to prevent strong solar radiation in hot summer, the shell of European substation is generally equipped with thermal insulation materials with low thermal conductivity as filler. Commonly used fillers are: rock wool board, polystyrene foam and so on.

In the traditional “combined substation” of unified design, the insulation filler is generally filled in the housing, which is no longer used by most designers, because: Although the thermal insulation filler can prevent the hot summer strong solar radiation, but also hinder the transformer operation to produce a lot of heat dissipation, so the designers in addition to the method of retaining the louver hole on the shell, while using the method of increasing the heat dissipation area, strengthening the air convection heat dissipation, but also reduce the manufacturing cost.

European box change surface handling: European box change surface handling methods are more, most of the north of China using traditional spray painting, paint, spray and other methods for treatment; In the economically developed areas of southern China, in addition to the above methods, colored tiles are also pasted outside the shell of the cement board structure, or veneer and other methods are used for surface treatment, especially the appearance of the box in the residential community, which is more coordinated and unified with the style of local buildings.

2, high voltage distribution device structure:

European box transformer high voltage distribution device, from the way into the line is divided into: terminal type, ring network type two; From the direction of the inlet line can be divided into: from the top of the box into the overhead line (traditional box to use this method more) and the use of high voltage cable trench from the underground line, which is a more common method of modern design.

There are many SF6 series load switches with SF6 gas as the arc extinguishing medium, and its cost is higher than that of FN-10 series high voltage load switches. This type of switch structure, with a fuse, without a fuse, grounding switch, etc., but generally equipped with a live display; The operating mechanism is generally manual, but also electrically operated. With a fuse, when the circuit short-circuit fault can cut off the switch, protect the circuit and transformers, switches and other equipment.

There are vacuum switches with vacuum as the arc extinguishing medium, such switches can be used alone, can also be used with fuses, and can also be used in series with SF6 series load switches, but this will increase the cost, if the user has no special requirements, it is not necessary to use this.

High voltage metering: In the high voltage distribution device, if the user has high voltage metering requirements, the high voltage metering cabinet must be set up.

Power supply departments across China do not have uniform requirements for high or low voltage metering issues. The power supply regulations of the Northwest region stipulate that when the transformer capacity is greater than 160KVA, high voltage metering must be used; The switch of the high voltage metering cabinet must be controlled by the power supply department. Beijing, Tianjin and other North China power supply departments believe that: box-type substation metering should be good on the low voltage side, so that it can improve the reliability of power supply, reduce the instability factors brought by high voltage metering, the loss of the transformer itself can be converted into electricity costs, borne by the user.

The structure of high-voltage metering cabinet in box-type substation is generally composed of CT, PT, and metering meters, remote control, telemetry devices, etc.

3, transformer room structure:

European box transformer is equipped with an independent transformer room, the transformer room is mainly composed of: transformer, automatic temperature control system, lighting and safety guardrail.

When the transformer is running, a large amount of heat will be generated in the transformer room, so the heat dissipation and ventilation of the transformer room are the key issues that should be considered in the design of the European transformer. When the transformer is running, a large amount of heat is continuously generated, so that the temperature of the transformer room continues to rise, especially when the ambient temperature is high, the temperature rises faster, so only natural ventilation and heat dissipation often cannot guarantee the reliable and safe operation of the transformer; In the European box change design, in addition to the natural ventilation of the box change with small transformer capacity, temperature measurement protection is generally designed and solved by forced exhaust measures. The system mainly consists of measuring device, measuring transformer room temperature, oil temperature can be. Then, through the manual and automatic control circuit, whether the exhaust fan needs to be put in, according to the setting range of the transformer’s reliable and safe operating temperature.

In the European box transformer, the transformer can choose both oil-immersed transformer and dry transformer, but because the dry transformer price is higher, so in the case of no special requirements of the user, the oil-immersed transformer should be preferred to reduce manufacturing costs. Transformer capacity is generally 100-1250KVA is appropriate, the maximum should not exceed 1600KVA.

4, low pressure chamber structure design:

The low-pressure chamber of the European box should be different in design structure according to the different use occasions of industrial and mining enterprises or residential areas. Generally, for the European box changes used by industrial and mining enterprises, power supply and lighting power supply should be designed separately. In the use of low-voltage metering, under normal circumstances, the power supply bureau requires separate metering of lighting electricity, mainly because the unit price of lighting electricity is generally higher than power electricity. In the structural design of substations used in residential areas, it is not necessary to consider the problem of power consumption.

The number of output paths of the low voltage chamber varies according to the capacity of the transformer and the needs of the user. The transformer capacity is small, and the user needs fewer output routes can be set up less; The transformer capacity is large, the user requires the input outlet number, can consider the design of more ways, can also consider the layout of the corridor operation form.