A Standard 11KV/0.4KV Indoor Substation Layout According to BNBC (Bangladesh National Building Code)
In Bangladesh, the BNBC and ELB rules are generally followed for preparing an 11KV/0.4KV Indoor Substation Layout in case of commercial building. But there are so many other authorities like Accord, Alliance, IEC, NFPA etc. those have individual codes and standards for ensuring the safety in Electrical Power Distribution. In term of factories Accord and Alliance, rules should be ensured besides BNBC and ELB.
What BNBC described for preparing a layout of Substation (REF. BNBC 2006, VOL 3, SEC 1.3.23.7):
1. In general, the Substation HT to LT Transformer shall be placed in one corner of the room so that the HT side remains away from the passage of the persons.
2. The HT Metering panel shall be located near the exterior of the substation room near the exit gate and also shall be convenient for the HT cable entry.
3. The HT Panel shall be located near the exterior, just after or adjacent to the HT panel.
4. LT Panel shall remain at a sufficient distance from the Transformer but not too far away from the Transformer. On the other hand, the location of the LT panel should such that the riser main cable can have their way upward or outward within a very short distance.
5. In allocating the areas within a substation, it is to be noted that the flow of electric power is from supply company network to HT room, then to a transformer and finally to the low voltage switchgear room. The layout of the rooms shall be in accordance with this flow. All the rooms shall have significant ventilation.
6. Special care should be taken to ventilate the transformer rooms and where necessary louvers at a lower level and exhaust fans at a higher level shall be provided at suitable locations.
A standard layout has been given below for better clarification of the above points.
2. The HT Metering panel shall be located near the exterior of the substation room near the exit gate and also shall be convenient for the HT cable entry.
3. The HT Panel shall be located near the exterior, just after or adjacent to the HT panel.
4. LT Panel shall remain at a sufficient distance from the Transformer but not too far away from the Transformer. On the other hand, the location of the LT panel should such that the riser main cable can have their way upward or outward within a very short distance.
5. In allocating the areas within a substation, it is to be noted that the flow of electric power is from supply company network to HT room, then to a transformer and finally to the low voltage switchgear room. The layout of the rooms shall be in accordance with this flow. All the rooms shall have significant ventilation.
6. Special care should be taken to ventilate the transformer rooms and where necessary louvers at a lower level and exhaust fans at a higher level shall be provided at suitable locations.
A standard layout has been given below for better clarification of the above points.
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| Standard 11KV/.415KV Substation Layout |
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