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GPS
Aerial
IRIG-B
10 MHz
GPS
Receiver
1 pps
Figure 3-5. Simplified Block Diagram of the 6135A/PMUCAL
Time to Complete a UUT Calibration
To fully calibrate a UUT, each UUT configuration must be tested. A UUT configuration
consists of one nominal frequency setting, one reporting rate setting, and one class
setting. If one of these settings changes, it is considered a configuration change. On
average, 6 hours to 10 hours of continuous automated testing is necessary to verify the
performance of one configuration. M Class UUTs and UUTs with higher reporting rates
take longer to test because they have more tests to run.
Some UUTs have a configurable range of nominal frequencies, reporting rates, and
classes that can be changed in the UUT configuration. These additional configurations
must be tested and verified to certify the UUT.
Calibration Test Measurements
The measurements in this section are unique to UUT calibration. A simplified definition
of each measurement is in the Glossary of this Operators Manual and expanded
definitions are in IEEE C37.118.1a-2014, Synchrophasor Measurements for Power
Systems Specification. The test report and interactive graph uses these measurements to
show errors between the reference and measured data.
The common measurements are:
•
Total Vector Error (TVE)
•
Frequency Error (FE)
•
Rate of Change of Frequency Error (RFE)
•
Step test results:
o Response Time
o Delay Time
o Overshoot
Refer to the Glossary for definitions of each common measurement.
STU_T0 and STU_TRefp
Hardware Trigger
Ref
p
Nominal
30 MHz
System
Clock
Timing Unit
(STU)
Aux(T
)
0
IRIG-B
"True"
Synchophasor
Mathematical
Model
Fluke
6135 A
Analogue
Signals
PMU
Measured
Synchophasor
Software Operation
UUT Calibration Procedure
Results =
Computed
PMU Errors
gtu177.emf
3
3-7
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