Section 9 in Tamil Nadu Electricity Regulatory Commission Tamil Nadu Electricity Distribution Code
9. Distribution Systems protection arrangement.
(1)Protection of the distribution system and the consumer's system shall be well coordinated. Individual protection schemes shall have adequate selectivity, sensitivity and reliability and speed of operation to disconnect the faulty equipment/circuit from the healthy system. No item of electrical equipment shall be allowed to remain connected to the distribution system unless it is covered by appropriate protection scheme.(2)In the distribution system protection for lines / U.G cables, transformers and other equipments shall be followed by the Licensee, and by the consumers of the distribution system as well in accordance with the provisions made in TNEGC. The distribution system relay setting shall be coordinated with that of STU and it shall be endorsed by STU and SLDC.(3)Every consumer within the area of supply of the Licensee who are availing / desire to avail of supply at 66KV, 110 KV, 230 KV level shall furnish the details of their equipment protection schemes to the Licensee and get approved before the connection is effected. On demand, the Licensee shall provide similar protection data relating to their distribution systems to any consumer seeking the above connection.(4)The Licensee and the EHT consumers of the distribution system shall attend the protection co-ordination meetings as and when called upon to do so by the STU / SLDC to discuss all related issues and take remedial measures as discussed and agreed to in such meetings.
