Phase Current Measuring Accuracy - Siemens SIMPRO-100 Instruction Manual

7
Commissioning
Figure 7.4 Two Voltage Source and Three Current Source Test Connections
Note: Relays equipped with ac voltage inputs
(Models SIMPRO-100-R or N-V) must be
properly grounded for accurate voltage
measurement.
7.3.2 Phase Current Measuring
Accuracy
1. Connect the current sources to the IA, IB, and
IC current inputs
(5 A or 1 A, as indicated by the ITAP setting).
2. Using the front-panel Set Relay\Relay
Elements\General Data functions or serial
port SHOW command, note the CTR and
PHROT settings.
3. Set the current source phase angles to apply
balanced three-phase currents. Refer to
Figure 7.1, page 100 for the correct phase
angles that depend on the PHROT setting.
104
4. Turn on the current sources and increase the
current applied to the relay. Use the
front-panel Meter Values\Instantaneous Meter
function to view the relay phase current
measurements. For the applied current
values shown in Table 7.3, the relay should
display phase current magnitudes equal to
the applied current magnitude times the CTR
setting.
Expected
|I| Applied Reading
(A secondary)
(CTR o |I| A
(A primary)
primary)
0.5
1.0
1.5
2.0
2.5
5.0
Table 7.3

Phase Current Measuring Accuracy

SIMPRO-100
A-Phase B-Phase C-Phase
Reading Reading Reading
(A primary) (A primary)
PRIM-2400C