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State of Rajasthan - Section

Section 9 in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004

9. Harmonic Distortion.

- This standard shall be achieved during Final Stage (Level-3).
(1)General. - Many loads in power system produce current and voltages at frequencies in multiple of the fundamental frequency. These multiple frequency voltage and currents are called harmonics and their ratio to the fundamental frequency is called harmonic order. Harmonics effect system operation and life of the equipments. Harmonics of add orders are more undesirable. Especially Industrial sub-stations the effect of harmonics are more severe. Some types of loads like Induction and Arc Furnace, electromagnetic equipment such as X-ray machines etc. may produce harmonics in supply voltages. Distribution Licencee shall ensure that the loads connected at the inter-connection points with Licencee not induce any harmonic voltage and distort the supply waveform. Subject to Distribution Licencee observing the Grid Code Connection Conditions in this regard, Licencee shall monitor the voltage harmonic levels at the supply points to the Users (Distribution Licencee, RVUN and major EHV consumer) and other strategic locations on the transmission system.
(2)Indicator of Quality for System Harmonics. - Harmonic contents of the supply voltage is indicated by the following indices:-
  40Vi2      
VTHD = ∑   x 100%      
V12
  i-1      
         
VTHD = Vi x 100%      
V1    
WhereV1 : ith harmonic of voltageV1 : Fundamental frequency (50 Hz) voltageVthd : Voltage total harmonic distortionVihd : Voltage distortion of ith harmonic
(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.