6.6
Verifying analog primary and secondary measurement
M11745-2 v10
Verify that the connections are correct and that measuring and scaling is done correctly. This
is done by injecting current and voltage to the IED.
Apply input signals as needed according to the actual hardware and the
application configuration.
1.
Inject a symmetrical three-phase voltage and current at rated value.
2.
Compare the injected value with the measured values.
The voltage and current phasor menu in the local HMI is located under Main menu/
Measurements/Analog primary values and Main menu/Measurements/Analog
secondary values.
3.
Compare the frequency reading with the set frequency and the direction of the power.
The frequency and active power are located under Main menu/Tests/Function status/
Monitoring/CVMMXN/CVMMXN:1/Outputs. Then navigate to the bottom of the list to
find the frequency.
Check both analog primary and secondary values, because then the CT
and VT ratios entered into the IED are also checked.
These checks shall be repeated for Analog primary values.
4.
Inject an unsymmetrical three-phase voltage and current, to verify that phases are
correctly connected.
If some setting deviates, check the analog input settings under
Main menu/Configuration/Analog modules
Measured values such as current and voltages as well as active, reactive and apparent power,
power factor phase angles as well as positive and negative and zero sequence currents and
voltages are available in the local HMI under Main menu/Tests/Function status/Monitoring.
Navigate to the measurement function that contains the quantity to be checked.
Table 2:
Measurement functions
Function
Quantity
Description
CMMXU
IL1 to IL3
amplitude, range and angle
CMSQI
3I
0
; I1 and I2
amplitude, range and angle
CVMMXN
S; P; Q; PF; Ilag; Ilead; U; I and f
amplitude, range and angle
VMMXU
UL12 to UL31 i.e. phase-to-phase
amplitude, range and angle
VMSQI
3U
0
; U1 and U2
amplitude, range and angle
VNMMXU
UL1 to UL3 i.e. phase-to-neutral
amplitude, range and angle
Also the Signal Monitoring tool in PCM600 can be used to read the measured values. In many
cases it is more convenient to use PCM600 since, among many things, reports on measured
values can be exported from the Signal Monitoring tool to other tools (for example, MS Excel)
for further analysis.
1MRK 505 293-UEN B
Section 6
Testing IED operation
Breaker protection REQ650
41
Commissioning manual
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