Section 6 Read measured values
About this chapter
This chapter describes measurement categories and how to locate them using the
HMI. Each measurement category has a section of its own that includes a general
description of the type of quantity being measured and the path in the local HMI to
the measurement.
6.1
Overview
The measurement menu contains primarily analog measurement data. External
signals can also be viewed as they are or as they appear in the Signal Matrix Tool
(SMT). These signals are a virtual representation of the hard wired signals on the
various inputs and outputs. The SMT is only accessible via the PCM and is intended
to simplify the configuration of the IED. It allows hardware changes to made without
having to reconfigure the internal logic. Signals that can be used in the SMT are
indicated with the Suffix SMT.
The functions available under measurements are outlined below.
1. Analog primary values are the quantities measured on the primary side of the
current and voltage transformers (CTs and VTs).
2. Analog secondary values are the quantities measured on the secondary side of
the current and voltage transformers. These are the quantities measured on the
Transformer module (TRM) inputs.
3. Analog mean values are the quantities measured at the inputs of the milliampere
module (MIM).
4. Under Monitoring a number of submenus are available. These include Service
values, Current phasors, Voltage phasors, Current sequence components and
Voltage sequence components.
5. Metering displays the pulse counter function. The measurements available here
show pulse counter status data.
All measurement descriptions in this document reflect the maximum number of
hardware units possible in any application. In reality the hardware in the IED will be
chosen according to a particular application. For example, it is possible to equip a 1/1
x 19” case IED with 14 I/O modules. In reality fewer I/O modules may be installed.
In the measurements menu the operator will only see data from the hardware and
software installed.
Section 6
Read measured values
RET 670
Operator's manual
1MRK504049-UEN rev. D
25
