Download METERING PROTOCOL APPENDICES A-G

ISO Tariff
Page No. 834
(a)
13.7
the accuracy of the Meter shall be tested for all combinations of the
following conditions:
i.
at ambient temperature, 85°C and -20°C;
ii.
at power factors of 100%, 50% lag and 50% lead; and
iii.
at 0% to 120% of class current;
(b)
accuracy curves shall be provided for all combinations of the conditions;
and
(c)
to pass this test, the Meter shall have the indicated accuracy at ambient
temperature for the following load conditions:
i.
± 0.2% at Full load at power factor of 100%;
ii.
± 0.25% at Full load at power factor of 50% lag;
iii.
± 0.25% at Full load at power factor of 50% lead; and
iv.
± 0.25% at Light load at power factor of 100%.
Line Voltage Variation Test
This test confirms the Meter’s correct operation under varying line voltage
conditions:
(a)
(b)
13.8
the Meter shall be tested at line voltages ranging from 80% to 120% of
rated voltage under the following load conditions:
i.
full load at power factor of 100%; and
ii.
light load at power factor of 100%; and
to pass this test the Meter shall meet the following criteria:
i.
operate as specified;
ii.
have an accuracy as specified in Section 13.6(c) throughout the
80% to 120% voltage range; and
iii.
the Power Failure Backup System shall not take over when the
voltage is above 80% and below 120% of rated.
Momentary Power Loss
This test confirms the Meter’s ability to withstand momentary power outages:
(a)
the test will be performed by opening the AC power supply input for the
specified duration;
(b)
twelve tests shall be conducted using the following sequence:
i.
energize the Meter;
ii.
simulate a power loss of 0.5 cycles at 60 hertz;
Posted April __, 1998
[Amends 1, 4, 5, 6, 7 incorporated herein]