Hardware Modifications; General - Siemens Siprotec 7UM611 Manual

3 Mounting and Commissioning
resistance. The higher secondary voltage thereby resulting can be reduced by a
voltage divider. Address 223 UE CONNECTION is set to neutr. transf..
Figure "Voltage Transformer Connections for Two Voltage Transformers in Open Delta
Connection (V Connection)" in Appendix A.3 shows how a connection is made with
only two system-side voltage transformers in open delta connection (V connection).
Figure "Asynchronous Motor" in Appendix A.3 shows a typical connection of the pro-
tection relay to a large asynchronous motor. The voltages for voltage and zero voltage
monitoring are usually taken at the busbar. Where several motors are connected to
the busbar, the directional earth fault protection detects single-pole earth faults and
can thus open breakers selectively. A toroidal transformer is used for detection of the
earth fault current.
Factor 213 FACTOR IEE considers the transformation ratio between the primary and
the secondary side of the summation current transformer when using current input I
Binary Inputs and Allocation possibilities of binary inputs and outputs, i.e. the individual matching to the
Outputs system are described in the SIPROTEC 4 System Description /1/. The presettings of
the device are listed in Appendix A, Section A.4. Check also whether the labelling cor-
responds to the allocated message functions.
Changing Setting If binary inputs are used to switch setting groups, the following must be observed:
Groups
• If the configuration is performed from the operator panel or using DIGSI
• One binary input is sufficient for controlling 2 setting groups, ">Param. This is
• If the binary input is configured as a make circuit, i.e. as active when voltage is
• The control signal must be continuously present or absent in order that the selected
Trip Circuit Moni- A circuit with two binary inputs (see Section 2.29) is recommended for trip circuit mon-
toring itoring. The binary inputs must have no common potential, and their operating point
must well below half the rating of the DC control voltage.
Alternately when using only one binary input, a resistor R is inserted (see Section
2.29). Please note that the response times are as long as approx. 300 s. Section
2.29.2 shows how the resistance is calculated.
3.1.2

Hardware Modifications

3.1.2.1

General

General Subsequent adaptation of hardware to the power system conditions can be necessary
for example with regard to the control voltage for binary inputs or termination of bus-
capable interfaces. The specifications of Section
cases whenever hardware modifications are made.
236
address 302 CHANGE the option must be set using Binary Input.
">Param.Selection1", since the nonallocated binary input " "Param.Selection2" is
considered as not activated.
applied (H active), the significance is as follows:
- not activated: Parameter set A
- activated: Parameter set B
setting group remains active.
EE
®
, at
should be observed in all
7UM61 Manual
C53000-G1176-C127-3
.