Download SCHEDULE-III (Volume-A) TECHNICAL

Spec--HT TVM (DLMS)
-3-
h) Maximum attitude above mean sea level
i) Average rain fall.
j) Maximum wind pressure
k) Isoceranic level (days/ year)
l) Seismic level ( Horizontal Accn.)
m) Permitted noise level
:1000 Meters.
: 10-100 cms.
: 200Kg/ Sq. meter.
: 40
: 0.30 g.
: 45 db.
3.04 SUPPLY SYSTEM:
Rated Voltage (Vref)
(For HTTVM)
(Through PT)
Ph.)
Rated current (Ib)
(Connected through CT)
3 x 63.5 V - Phase to Neutral (3 phase 4 wire system)
3 x 110 V - Phase to Phase
Meter shall be programmed for PT ratio 11KV/110V (Ph.to
3 x -/5 Amps.
Multiplying factor to arrive at actual primary values wherever applicable shall
be calculated from the CT and PT ratio of the installed CTs and PTs/CT ratio of the
installed CT’s.
3.05 POWER FACTOR RANGE:
The meter shall be suitable for full power factor range from zero (lagging)
through unity to zero (leading). The meter should work as an active energy import
and export and reactive (lag and lead) energy meter.
3.06 POWER SUPPLY VARIATION:
The supply system shall be 3x110V Phase to Phase,3 phase 4 wires. The
extreme power supply variations for which an operating meter should withstand
without damage and without degradation of its meteorological characterstatics when
it is subsequently operated under its normal operating conditions shall be as follows:
Specified operating range
Limit range of operation
Frequency
- 0.8 to 1.15 V ref.
- 0.7 to 1.20 V ref.
- 50 Hz. +/- 5%
However, the bidder can offer meter, which can withstand higher variations. The
limit of power supply variations should be as per IS: 14697-1999.
3.07 ACCURACY:
Class of accuracy of the meter shall be 0.5S. The accuracy should not drift
with time.