Schlumberger Sema SMFMM-1 User Manual
Testing, Troubleshooting, and Maintenance
SENTINEL Meter Technical Reference Guide
7-7
Demand Test Method
1
Connect the meter under test and the reference standard in the same circuit
with all voltage coils in parallel and current coils in series as per standard
meter testing procedures (Figure 7.3).
with all voltage coils in parallel and current coils in series as per standard
meter testing procedures (Figure 7.3).
Figure 7.3 Test Connections
2
Apply rated voltage to the meter under test and the reference standard. Set the
test current to the desired level (FL, LL, or PF test amps or any desired level
within the meter rating). To ensure that the supply polarities are correct, check
that the Load Emulation Annunciator is traversing in the forward direction.
Switch off only the current to both the meter and the standard.
test current to the desired level (FL, LL, or PF test amps or any desired level
within the meter rating). To ensure that the supply polarities are correct, check
that the Load Emulation Annunciator is traversing in the forward direction.
Switch off only the current to both the meter and the standard.
3
Reset and enable the pulse counting device.
4
Put the SENTINEL meter into Test Mode by pressing the Test switch. Once this
has been done, push in the Demand Reset switch to zero the test registers and
start a new demand interval.
has been done, push in the Demand Reset switch to zero the test registers and
start a new demand interval.
5
Start the test by switching on the current to all meters and the reference
simultaneously.
simultaneously.
6
The End-of-Interval (EOI) flag will appear for five seconds in the display after
the end of the demand interval. At this time, switch off the current to all meters
simultaneously and stop the pulse count. Do not disconnect the voltage to the
meter.
the end of the demand interval. At this time, switch off the current to all meters
simultaneously and stop the pulse count. Do not disconnect the voltage to the
meter.
7
Record the pulse counter total and the values displayed on the SENTINEL
meter.
meter.
Table 7.2 Meter Singlephase Test Constants (SPTC)
Form
Series
A Phase Only
B Phase Only
C Phase Only
45 or 12
3Ø, 3W,
0.866
0.866
—
.866
46
1
1
2 1/2 Element Meter
3Ø, 4W,wye
1
1
1
1
9 or 16
3Ø, 3W,
0.911
.866
.0866
1
9, 16, or 14
3Ø, 4W, wye
1
1
1
1
45 or 12
3Ø, 3W, wye
1
1
—
1
∆
∆
D
ra
ft