ABB ANSI - Page 26

26 ANSI MEDIUM VOLTAGE METAL-CLAD DIGITAL SWITCHGEAR
The test setup to measure the secondary output
of the sensors is shown below. EESAILEC test
socket pt#TC-E-RJ45-INF and RJ45 plug, pt#FI-
RJ45-DIA4 are used to in the illustration below.
These are specifically designed to be used with
ABB digital switchgear with sensors compliant to
the IEC standards. There may be other similar
devices available that could be used. Measuring
device can be any device capable of measuring
the recommended ranges and comply with the
proper IEC standard input parameters for
accurate measuring.
RJ45 connectors have specific pin wiring based
on the requirements of the IEC standards for the
sensors. Test personnel must ensure that any
adapters or connections using RJ45 connectors
meet these requirements.
Extensions of the CAT6 cable can be made up to
about 1 meter in length and must follow the same
pin wiring as the sensor cable.
Supervision
In the protection relay, voltage metering is
supervised by the VMMXU function. Metering
accuracy is stated in Table 5.
A measured value under the zero-point clamping
limit is forced to zero. This allows the noise in the
input signal to be ignored. Read more details in
the technical manual of the protection relay.
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
Characteristic Value
Operation
accuracy
Depending on the frequency of the
measured voltage: f

)
Voltage sensor installed in the cable
compartment
• Step 1/7
Verify sensor parameters set in the protection
relay with sensor rating plates found on the
sensors. These may be found on the circuit
breaker compartment door or in the low voltage
wiring compartment.
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40
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41
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
Function 
Three-phase voltage
measurement (VMMXU) 
Residual voltage
measurement (RESVMMXU) 
Phase sequence voltage
meas. (VSMSQI) 
On the protection relay LHMI go to -> Main Menu/
Configuration/Analog inputs/ Voltage (3U, VT)
• Primary voltage = Nominal voltage of the
network
• VT connection = Wye (star connection)
• Amplitude Corr A = sensor rating plate, phase A
• Amplitude Corr B = sensor rating plate, phase B
• Amplitude Corr C = sensor rating plate, phase C
• Division ration = 10 000
• Voltage input type = RVD sensor
• Angle Corr A = sensor rating plate phase A
• Angle Corr B = sensor rating plate phase B
• Angle Corr C = sensor rating plate, phase C
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40 Example of a
voltage sensor label
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41 Voltage sensor
parameters