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The difference between the choice of flame retardant bridge and fireproof enclosed busway

  • Categories:Zhongrui News
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  • Time of issue:2019-05-28 14:23
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(Summary description)In many large buildings or important buildings, in addition to normal power supply and distribution, diesel generators are also available as emergency power sources. Once there is a problem with the grid-powered line or a fire inside the building causes the mains to trip, the diesel generator set needs to be used for temporary power supply to ensure that important work does not stop working, or to ensure evacuation of the lighting instructions. . The electricity generated by the diesel generator needs to be fed through a part of the low-voltage distribution cabinet of the substation through the low-voltage distribution cabinet to the electrical equipment that needs emergency power. The low-voltage power distribution cabinet of the diesel generator and the substation is a power supply system that is connected by a flame-retardant bridge or a fire-resistant closed bus.

The difference between the choice of flame retardant bridge and fireproof enclosed busway

(Summary description)In many large buildings or important buildings, in addition to normal power supply and distribution, diesel generators are also available as emergency power sources. Once there is a problem with the grid-powered line or a fire inside the building causes the mains to trip, the diesel generator set needs to be used for temporary power supply to ensure that important work does not stop working, or to ensure evacuation of the lighting instructions. . The electricity generated by the diesel generator needs to be fed through a part of the low-voltage distribution cabinet of the substation through the low-voltage distribution cabinet to the electrical equipment that needs emergency power. The low-voltage power distribution cabinet of the diesel generator and the substation is a power supply system that is connected by a flame-retardant bridge or a fire-resistant closed bus.

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 14:23
  • Views:
Information
In many large buildings or important buildings, in addition to normal power supply and distribution, diesel generators are also available as emergency power sources. Once there is a problem with the grid-powered line or a fire inside the building causes the mains to trip, the diesel generator set needs to be used for temporary power supply to ensure that important work does not stop working, or to ensure evacuation of the lighting instructions. . The electricity generated by the diesel generator needs to be fed through a part of the low-voltage distribution cabinet of the substation through the low-voltage distribution cabinet to the electrical equipment that needs emergency power. The low-voltage power distribution cabinet of the diesel generator and the substation is a power supply system that is connected by a flame-retardant bridge or a fire-resistant closed bus.
 
Since the fire-resistant cable or the fire-resistant enclosed busway is used as an emergency power line in the event of a problem in the power grid or line, it is also used as a power transmission line in the event of a fire or other disaster. Therefore, fire-resistant cables or fire-resistant enclosed busbars must be able to guarantee normal power transmission at high temperatures. When the ambient temperature reaches 700 °C or above, the power supply can be operated for more than 1.5 hours without causing a short circuit between the wires due to an increase in internal insulation due to an increase in ambient temperature. Under what circumstances should fire-resistant cables be used, and under what circumstances should fire-resistant closed busbars be used? This is mainly determined by the space required for the capacity of the diesel generator set to the low-voltage distribution cabinet and the direction of the line.
 
Flame retardant bridge
 
Refer to GB12706-91 standard, the fire resistance characteristics should meet the requirements of GB12666.6-90. In the cable model, the fire resistant cable is based on NH, with 铠 (NH-YJV32) and without 铠 (NH-YJV) Two. The cable with the cable is slightly more expensive than the cable without the cable. Because their structure is different.
 
The structure with 铠 cable is divided into six layers, the middle layer is copper conductive core, the second layer outside the copper core is mica tape wrapped insulating refractory layer, the third layer is XLPE insulation layer, and the fourth layer is The inner layer is made of steel wire armor (including six copper wires) and the sixth layer is PVC sheath.
 
The fire-resistant cable structure without bismuth is divided into four layers, the first layer in the middle is a copper conductive core, the second layer outside the copper core is a mica tape wrapped insulating refractory layer, and the third layer is a cross-linked polyethylene insulating layer, fourth The layer is a PVC sheath.
 
At the same time, the flame retardant bridge is divided into two types of fire resistance grades A and B. The fire resistance temperature of the type A is 950-1000 ° C, and the fire resistance temperature of the type B is 750-800 ° C. Take the NH-YJV mica tape/cross-linked polyethylene composite insulated PVC sheathed power cable (specification 0.6/1KV4×240+1×120) as an example. This cable is not 铠, and other Compared with fire-resistant cables, it is easy to bend and easy to lay. The cable conductor allows a maximum temperature rating of 90 ° C for long-term operation and a cable short - circuit temperature of 250 ° C for a duration of no more than 5 seconds. Its fire-resistant busway environment temperature is generally 700 ~ 800 ° C, can maintain 1.5 hours of transmission operation. The current carrying capacity is generally about 450A, and the direction is relatively flexible when laying. When the transmission current reaches above 1000 amps, the number of fire-resistant cables increases.

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