Section 9(3) in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004
(3)Control and Measurement. - Harmonic measurement shall conform to IEC Std. 1000-4-7 or IEEE Std. 519. The Total Harmonic Distortion (THD) determined in accordance with IEC Std. 1000-4-7 shall not exceed 1% at the inter-connection point of EHV system in the Final Phase. The measurement should be taken at 10 minutes interval and shall last for 1 week per site. Licencee shall measure the THD at strategic such inter-connection points which it consider prone to harmonic voltage generation at regular interval of 6 months. RVPN shall intimate the programme to RVUN or Distribution Licensee as the case may be at least 7 days in advance and their representative may be present during such measurements. Wherever THD exceeds the limit or individual harmonics exceed 0.5%, RVPN shall measure harmonics with and without load/generating station to ascertain the origin. Licencee will compile a list of all metering points, which are prone to harmonic generation for taking remedial measures.
