The boards for mast transformer stations are designated for commutation and measurement of electric power of consumers in the low voltage electric network 3x200/380 V, 50 Hz, supplied with power by an aerial transformer station with a capacity of up to 400 kVa. They are fitted directly on the pole. There is a possibility for furnishing a separate power supply section and street lighting control.
Technical Details
Voltage supply:
Degree of protection:
Temperature of environment during service use:
220/ 380 V ± 10 %, 50 Hz
IP 20 for covered installation IP 43 for open installation
-20 °C to + 40 °C in the open -5 °C to + 40 °C under cover
Degree of insulation:
Climatic performance:
Working position:
660 V
Normal
Vertical
Rated current:
Depending on the diagram
Device
The boards have been manufactured as a welded construction with a protective anticorrosive coating of polyester dust. There has been provided one-sided service at the front part of the boards, made possible through one or two doors with fitted locks. The apparatuses in the main circuits of the boards have been fitted on an installation panel with standard instruments. The symbols of the apparatuses and the connecting cables have been put on them or near them meeting the requirements of the diagrams using a secret method. The electric diagram of each board has been fitted on the inside of the door.
Working Conditions
Above sea-level height:
Up to 1000 meters
Humidity of air:
Shall not exceed 50 % at a maximum temperature of + 40 °C 90 % at a temperature of + 20 °C
Environment:
Explosion - proof, with absence of chemically aggressive gases and liquids, water vapors and current - conductive dust.
