1. Safety technical requirements for distribution transformers installed on poles.
(1) The base of the transformer shall not be less than 2.5m from the ground, and all iron parts shall be grounded.
(2) The height of the exposed conductive part from the ground should be above 3.5m
(3) The transformer base should be fixed with the bench, and the upper part should be fixed with the pole.
(4) The upper and lower leads of the transformer should adopt multi-strand insulated wires. The distance between the high-voltage drop fuse and the ground shall not be less than 4m, the distance between the middle phase and the edge phase of the high-voltage fuse shall not be less than 0.5m, and the included angle between the center line of the porcelain bottle of the high-voltage fuse and the vertical line shall be 250 ~ 300.
5] "No climbing, high pressure is dangerous!" Warning signs.
2. Safety technical requirements for distribution transformers installed in the open air.
(1) The foundation of the floor transformer shall be 0.2m higher than the ground. For example, in the stagnant water area, the transformer should be located around the drain; Masonry fence should be set around the transformer, and the height of the fence should not be less than1.8m. The fence door should be made of refractory material, designed on the low voltage side of the transformer, and opened and locked outwards. Bamboo fence is not suitable.
(2) The transformer is installed on a platform (pier), and the height of the platform (pier) should not be less than 2.5m
(3) Two or more transformers should be installed outdoors, and the distance between their shells should not be less than1.25m.
(4) transformer shell should be properly.
5] The distance between transformer and combustible building should not be less than 5m, and the distance between transformer and refractory building should not be less than 3m.
[6] On the fence or platform (pier), hang the warning sign "Stop, high pressure danger".
3, indoor installation of distribution transformer safety technical requirements
(1) There should be good natural ventilation in the room.
⑵ The fire resistance rating of the transformer room should be Grade I. ..
(3) The clear distance between the transformer side and the back wall and side wall should not be less than 0.6m, and the clear distance between the transformer side and the door should not be less than 0.8m；; The doors and windows of the distribution room should be opened outwards, and there should be shutters below the doors and windows.
Extended data:
Daily management:
1. Reasonable selection of installation position of distribution transformer
The installation of distribution transformer should meet the requirements of user voltage. Try to avoid installing distribution transformer in barren hills, which is easy to be struck by lightning and far away from residential areas, which is not convenient for operators to maintain regularly and manage staff.
2. Reasonable selection of distribution transformer capacity
It is also very important to choose the capacity of distribution transformer reasonably, which can neither cause overload and burn-out of distribution transformer, nor cause waste of large horse-drawn cars. The capacity of distribution transformer should be reasonably selected according to the user load and statistical capacity. For example, a100kVA distribution transformer can carry 85kW load with a power factor of 0.85.
3. Strengthen the measurement of power load.
During the peak period of power load, the load measurement of each distribution transformer should be strengthened, and the number of measurements should be increased if necessary. The distribution transformer with unbalanced three-phase current should be adjusted in time to prevent the neutral line current from being too large, which is easy to burn out the lead and cause the user equipment to burn out.
4. Avoid installing low-voltage metering box on distribution transformer.
The low-voltage metering box installed in the distribution transformer station area in remote mountainous areas should be gradually dismantled and installed indoors as far as possible. For example, a few years ago, when our bureau eliminated rural areas without electricity, low-voltage metering boxes were installed in remote mountainous areas to facilitate management and prevent power loss. Due to long-term operation, the glass of metering box or the low-voltage pile head of distribution transformer cannot be replaced in time, which leads to the damage of distribution transformer due to rain and other reasons.
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