Introduction; Using This Manual; Definitions Of Terms - Siemens 7UT51 Instruction Manual

7UT51 v3
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Introduction

1.1

Using This Manual

This operator's manual provides the information
required to install and operate a Siemens 7UT51
Differential Protective Relay. In addition to describing
how to interface with the relay, the manual offers
general information about the functions and features,
along with some application examples.
This manual assumes the operator is using the 7UT51
relay's operator panel to program, maintain, and
operate the relay; however, the manual gives a
general overview of using a PC interface along with
WinDIGSI and WinDIGSI software. Refer to the
WinDIGSI User's Manual or the WinDIGSI Instruction
Manual for more detailed instructions.
Event annunciations and setting options for the
addresses mentioned are as they appear in the
WinDIGSI software or the relay front panel. The titles
can vary between the software and the front panel of
the 7UT51.
1.2

Definitions of Terms

Adaptation factor – See Matching Factors
CT – Current Transformer
CTR – Current Transformer Turns Ratio
Cross-Block – Harmonic blocking across phases
Discrete Input – Binary Input
ENABLED/DISABLED – The available protective and
additional functions can be programmed "Enabled/
Existent". Functions which are configured "Disabled"
will not be processed. There will be no annunciations
and the associated setting parameter will not be
requested during setting.
Password – A password is required to change any
settings, or to run any test routines. A password is not
required to view annunciation logs, measured values,
or settings. The password is six zeroes: 000000
In or I – Nominal rated current of the monitored
N
winding or side of the transformer
PRIM-2330C
I – Rated secondary current of winding x or side
NsecWx
x.
I – Rated secondary current of the virtual object.
Objsec
IxLy – Winding x (or Side x), Phase y
Marshalling – A special-use term that refers to the
programming assignment of a set of logical functions
to various physical I/O devices.
Matching Factors – (see Section 4.1.1 on page 39
and Figure 4.3 on page 41) Based on the transformer
setting information entered into Address Block 1100,
the relay will match the currents to be process by the
relay. The relay matches these currents
mathematically for any chosen vector group (see
Table 4.1 on page 46 and Table 4.2 on page 47).
Note: The "k" matching factors are calculated by the
relay from the entered rated data and can be
read out in the operational annunciation in
Address Block 5100.
Megger – A high-range ohmmeter having a built-in,
hand-driven generator as a direct voltage source,
used for measuring insulation resistance values and
other high resistances. Also used for continuity,
ground, and short circuit testing in general electrical
power work.
MMI – Man machine interface, example the relay front
panel or PC.
Nonexistent/Existent – The available protective and
additional functions can be programmed "Disabled/
Nonexistent". Functions which are configured
Disabled will not be processed. There will be no
annunciations and the associated setting parameter
will not be requested during setting.
NV-RAM – Non-volatile random access memory
Parameterizing – Setting up/programming the
parameters of the relay.
RGF or REF – Restricted ground-fault.
Star-point – The common point or the non-polarity
connection of a "Y" connected transformer.
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Introduction
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