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State of Rajasthan - Section

Section 6 in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004

6. Voltage Management.

- (1) Voltage Profile. - Licencee shall make all possible efforts to ensure that the grid voltage remain within the following voltage levells at all EHV sub-stations of its Transmission System on real time basis at SLDC. Voltage profile at each interconnection point shall be maintained as under:-
Voltage (kV rms)
Nominal Maximum Minimum
400 420 360
220 245 200
132 145 120
66 72.6 59.4
33 34.98 30.03
11 11.66 10.01
(2)Voltage Unbalance. - This performance standard shall be achieved during Final Stage (Level-3). The phase voltages of a 3-phase supply should be of equal magnitude. Deviations will result in decreased efficiency, negative torque, vibrations and overheating. Severe unbalance could lead to malfunctioning of some equipment. Some types of load like electric traction, Induction & Arc. Furnace may induce un-balance in the supply voltages. Distribution Licencee shall ensure that the loads connected at the inter-connection points are perfectly balanced. Subject to Distribution Licencee observing the Grid Code Connection Conditions in this regard the voltage unbalance expressed as the following ratio shall not exceed the values given below:-
(i) Voltage Unbalance =| Deviation between highest and lowest phase voltageAverage voltage of three phases.|
Voltage Level Limit of voltage unbalance
220 Kv and above 2%
Below 220 Kv 3%
(3)Voltage Variation Index. - This performance standard shall be achieved during Final Stage (Level-3).Voltage variation Index representing the degree of voltage variation from nominal value of over a specified period of time shall be computed by the RVPN.N∑ (Vi - Vs) 2
| VVI =| 100Vs| x square root of| i=1N
Where Vi = RMS value of voltage in KV at ith hour in the period for which VV I is computed Vs= the nominal voltage in RMS value of the system i.e. 400 KV, 220, KV and 132KV etc. as may be applicable at the inter-connection point.N = number of hourly measurements over the specified period of time.The Voltage Variatic Index (VVI) on annual basis shall not exceed the limit of 1% for voltage levels of 220 kV, 132 kV and 66 kV and in respect of 400 kV nominal voltage the WI shall not exceed the 1.125%.RVPN shall determine is index separately for higher and lower than normal system voltages. Defective metering/abnormal data will be discarded while computing the index.
(4)Current unbalance. - Current unbalance shall not be more than 3%. Current unbalance shall apply on all the feeders of a voltage class emanating from a sub-station taken as a group. In case of railway traction it shall apply on 3 sub-stations in a row taken as a group. Distribution Licencee shall be given at least 12 hours to remedy current unbalance. Failure to meet this criterion shall be discussed in committee proposed under grid code and remedial measures agreed there on.