remote control equipment - Indian Railways Institute of Electrical ...

viii) Harmonic Voltage Distortion
The consumer is required to carry Harmonic Analysis under full
load conditions. It is stipulated that the individual harmonic
distortion (Vn) and total harmonic voltage distortion (Vt) at the
point of supply shall not exceed 1% and 3% respectively.
V - RMS value of fundamental voltage.
Vn - RMS value of harmonic voltage of order “n”, expressed
as percentage of RMS value of fundamental and shall be
calculated using the following expression.
√ (V2 2 + V3 2 + V4 2 +…….+Vn 2 )
Vt = ------------------------------------------ x 100
V
d) The tariff charged for traction should be reviewed periodically with the
SEB. It should be ensured that the rates do not exceed those charged
in EHV tariff of the SEB applicable to other consumers.
2.3 Monthly Meter Readings
a) In earlier Railway Electrification installations, only one set of meters
owned by the Supply Authority has been installed to meters the traction
load. In later installations, a second set of meter is to be provided on
the sub-station switchboard at Railways cost. Where only one set of
meters belonging to the supply authority is installed yearly testing of
the meter should be carried out. If its accuracy is the doubt at any point
of time, the Railway is entitled to ask for testing and certification of the
meter. Where a second set of meters has been provided at Railways
cost, the figures for billing purpose should ordinarily be based on the
average readings of the two sets of meters, unless specifically provided
for otherwise the Agreement. The exact procedure covering these
aspects should be embodied in the Agreement with the Supply
Authorities.
b) The monthly meter reading should be taken on an agreed date each
month jointly by representatives of the Supply Authority and the
Railway. The meter card as well as the printomaxigraph chart reading
showing maximum demand for the month should be initiated by
representatives of both parties. Only readings jointly recorded as above
should be accepted for billing purposes.
c) When visiting the grid sub-stations for taking meter readings, the
supervisory official concerned will also obtain additional information
such as daily maximum demand for traction, power factor, load factor,
variation of voltage, changes in the system of interconnection, which
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