Analog Inputs; Introduction; Setting Guidelines; Setting Of The Phase Reference Channel - Hitachi Relion 670 Series Applications Manual

1MRK511407-UUS Rev. N
Section 4
4.1

Introduction

Analog input channels must be configured and set properly in order to get correct measurement results
and correct protection operations. For power measuring, all directional and differential functions, the
directions of the input currents must be defined in order to reflect the way the current transformers are
installed/connected in the field ( primary and secondary connections ). Measuring and protection
algorithms in the IED use primary system quantities. Setting values are in primary quantities as well and
it is important to set the data about the connected current and voltage transformers properly.
An AISVBAS reference PhaseAngleRef can be defined to facilitate service values reading. This analog
channel's phase angle will always be fixed to zero degrees and remaining analog channel's phase angle
information will be shown in relation to this analog input. During testing and commissioning of the IED,
the reference channel can be changed to facilitate testing and service values reading.
4.2

Setting guidelines

4.2.1

Setting of the phase reference channel

All phase angles are calculated in relation to a defined reference. An appropriate analog input channel is
selected and used as phase reference. The parameter PhaseAngleRef defines the analog channel that is
used as phase angle reference.
4.2.1.1

Example

Usually the A phase-to-ground voltage connected to the first VT channel number of the transformer input
module (TRM) is selected as the phase reference. The first VT channel number depends on the type of
transformer input module.
For a TRM with 6 current and 6 voltage inputs the first VT channel is 7. The setting PhaseAngleRef=7
shall be used if the phase reference voltage is connected to that channel.
Phasor measurement unit RES670
Application manual

Analog inputs

The IED has the ability to receive analog values from primary equipment, that are sampled by
Merging units (MU) connected to a process bus, via the IEC 61850-9-2 LE protocol.
The availability of VT inputs depends on the ordered transformer input module (TRM) type.
The available setting parameters related to analog inputs are depending on the actual
hardware (TRM) and the logic configuration made in PCM600.
If a second TRM is used, at least one TRM channel must be configured to get the service
values. However, the MU physical channel must be configured to get service values from that
channel.
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Section 4
Analog inputs
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