WEBTEC RMS Mors Smitt 2V75 User manual
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2V75 User Guide
Metrosil Module
RMS Mors Smitt
Advanced Protection Devices
User Guide
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2V75
User Guide
About This Manual
This User Guide covers all 2V75 relays manufactured from May 2023. Earlier products do not
necessarily incorporate all the features described. Our policy of continuous development means that
extra features & functionality may have been added.
The 2V75 User Guide is designed as a generic document to describe the common operating
parameters for all relays built on this platform.
The copyright and other intellectual property rights in this document, and in any model or article produced from
it (and including any registered or unregistered design rights) are the property of RMS Mors Smitt. No part of
this document shall be reproduced or modified or stored in another form, in any data retrieval system, without
the permission of RMS Mors Smitt, nor shall any model or article be reproduced from this document without
consent from RMS Mors Smitt.
While the information and guidance given in this document is believed to be correct, no liability shall be
acceptedfor any loss or damage caused by any error or omission, whether such error or omission is the
result of negligence or any other cause. Any and allsuch liabilityis disclaimed.
Contact Us
RMS Mors Smitt
19 Southern Court • Keysborough 3173 • AUSTRALIA
Phone 61 3 8544 1200
Email sales.rms@wabtec.com • Web http://www.morssmitt.com/rms
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Contents
Technical Bulletin ..................................................................................................................................4
User Guide ............................................................................................................................................4
Modules with Internal Shunt Wiring.......................................................................................................6
Modules Suitable for External Shunt Wiring..........................................................................................6
Safety Section .......................................................................................................................................7
Unpacking..............................................................................................................................................8
Dimensions............................................................................................................................................9
Typical Rack Mounting with 2V75 mounted into a 19” sub rack frame with rack mount bracket........10
Typical surface mounting arrangement with surface mount bracket...................................................11
Example of Rack Mounting Installation...............................................................................................12
Equipment Operating Conditions ........................................................................................................16
Equipment Connections ......................................................................................................................16
Decommissioning & Disposal..............................................................................................................17
Mechanical Inspection.........................................................................................................................18
Contents .......................................................................................................................... 3
Documentation................................................................................................................ 4
Introduction..................................................................................................................... 5
Typical Connection Diagrams........................................................................................ 6
Installation....................................................................................................................... 7
Maintenance.................................................................................................................. 18
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Documentation
Technical Bulletin
The detailed technical attributes, functional description & performance specifications for the 2V75
are described in the product Technical Bulletin.
The order of precedence for product information is as follows:
•Technical Bulletin
•User Guide
User Guide
This User Guide covers all 2V75 relay versions & describes the generic features & attributes
common across all versions.
Different relay versions are required to cater for varying customer requirements such as auxiliary
voltage range, I/O configuration, case style, relay functionality etc.
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Introduction
The 2V75 Metrosil module is designed for application with high impedance differential protection
schemes.
An external Metrosil module having a nonlinear resistance characteristic is required for each phase
element to limit the peak voltage appearingacross the secondary differential circuits under internal fault
conditions.
The Metrosil module may also be fitted with resistors either for series connection to establish the
stabilisation voltage of the high impedance scheme or shunt connection to alter the high impedance
scheme sensitivity.
The 2V75 Module provides a compact, simple & cost effective means of fitting a pre-wired Metrosil &
resistor combination into protection panels employing high impedance differential schemes.
Mounting is achieved by first fitting a special panel to the front of the cubicle. This panel is suitable for
19 inch rack or flush mounting.
TheseparateMetrosilmoduleistheninstalledfromtherearofthecubicle&latchedontotheself-aligning
rails on the front rack mounting panel. Retention screws are provided to lock the Metrosil module in
place.
The Metrosil module may, alternatively, be surfacemounted in the rear of the cubicle using the surface
mount bracket.
Heavy duty screw terminals are provided on the rear of the Metrosil module to suit ring or crimp lug
terminals. Internal wiring utilizes 2.5mm2cable.
The rear terminal door may be swung open to access the stabilizing resistors (where fitted) to allow
adjustment.
The completed installation is compact while providing safety isolation, the desired level of ventilationfor
the stabilizing resistors & a means of simple adjustment.
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Typical Connection Diagrams
Modules with Internal Shunt Wiring
Modules Suitable for External Shunt
Wiring
Note: Internal shunt wiring is only available on
variants with a Metrosil.
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Installation
Safety Section
This Safety Section should be read before commencing any work on the equipment.
The information in the Safety Section of the product documentation is intended to ensure that
products are properly installed and handled in order to maintain them in a safe condition. It is
assumed that everyone who will be associated with the equipment will be familiar with the contents
of the Safety Section.
Explanation of Symbols & Labels
The meaning of symbols and labels which may be used on the equipment or in the product
documentation, is given below.
Caution: refer to product information
Caution: risk of electric shock
Functional earth terminal
Note: this symbol may also be used for a
protective/safety earth terminal if that terminal
is part of a terminal block or sub-assembly
eg. power supply.
!
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Unpacking
Upon receipt inspect the outer shipping carton or pallet for obvious damage.
Remove the individually packaged relays and inspect the cartons for obvious damage.
To prevent the possible ingress of dirt the carton should not be opened until the relay is to be used.
Refer to the following images for unpacking the relay:
Outer packing carton
showing shipping documentation pouch.
Address label on top of carton.
Inner packing carton with lid open showing
protective foam insert.
Panel mounting adapter is at the top.
1 x Front panel
4 x front panel locating thumb screws
1 x panel mount kit
1 x panel mount kit self threading screws
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Dimensions
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Typical Rack Mounting with 2V75 mounted into a 19” sub rack frame with rack mount
bracket
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Typical surface mounting arrangement with surface mount bracket
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Example of Rack Mounting Installation
1 x Front panel
4 x front panel locating thumb screws
1 x panel mount kit
1 x panel mount kit self threading screws
Panel mount plate being screwed
into 19 inch sub rack.
Rear of panel mount plate showing
fibreglass insulating plate &
location points for the Metrosil module.
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Earth connection to panel mount plate.
Connect other end to
Metrosil module earth point.
Load the Metrosil module into the rear
of the cubicle & locate onto
the panel mounting plate.
This photo shows the Metrosil module
in position viewed from the rear.
Note the clear polycarbonate terminal cover.
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This photo shows the Metrosil module
location lugs protruding through
the front mounting plate.
Screws are being fitted to
secure the Metrosil module.
Remove clear polycarbonate
terminal cover screws and
mounting pillars which hold the
rear door closed.
Swing open the rear door to
access the stabilizing resistors.
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Loosen the moving terminal to adjust
the nominal value of each resistor.
Do not attempt to force the moving
terminals to slide as this may
damage the resistance wire.
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Equipment Operating Conditions
The equipment should be operated within the specified electrical and environmental limits.
Protective relays, although generally of robust construction, require careful treatment prior to
installation and a wise selection of site. By observing a few simple rules, the possibility of
premature failure is eliminated, and a high degree of performance can be expected.
Care must be taken when unpacking and installing the relays so that none of the parts are damaged
or their settings altered and must always be handled by skilled persons only.
Relays should be examined for any wedges, clamps, or rubber bands necessary to secure moving
parts to prevent damage during transit and these should be removed after installation and before
commissioning.
The relay should be mounted on the circuit breaker or panel to allow the operator the best access
to the relay functions.
Equipment Connections
Personnel undertaking installation, commissioning or servicing work on this equipment should be
aware of the correct working procedures to ensure safety. The product documentation should be
consulted before installing, commissioning or servicing the equipment.
Terminals exposed during installation, commissioning and maintenance may present hazardous
voltage unless the equipment is electrically isolated.
If there is unlocked access to the rear of the equipment, care should be taken by all personnel to
avoid electric shock or energy hazards.
Voltage and current connections should be made using insulated crimp terminations to ensure that
terminal block insulation requirements aremaintained for safety. To ensure that wires are correctly
terminated, the correct crimp terminal and tool for the wire size should be used.
Before energising the equipment, it must be earthed using the protective earth terminal, or the
appropriate termination of the supply plug in the case of plug connected equipment. Omitting or
disconnecting the equipment earth may cause a safety hazard.
The recommended minimum earth wire size is 2.5mm2, unless otherwise stated in the technical
data section of the product documentation.
Before energising the equipment, the following should be checked:
1. Voltage rating and polarity;
2. CT circuit rating and integrity of connections;
3. Protective fuse rating;
4. Integrity of earth connection (where applicable)
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Decommissioning & Disposal
Decommissioning: The auxiliary supply circuit in the relay may include capacitors across the
supply or toearth. To avoid electric shock or energy hazards, aftercompletely
isolating the supplies to the relay (both poles of any dc supply), the capacitors
should be safely discharged via the external terminals prior to
decommissioning.
Disposal: It is recommended that incineration and disposal to water courses is avoided.
The product should be disposed of in a safe manner.
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Maintenance
Mechanical Inspection
Module Assembly
Inspect the module for obvious signs of damage or ingress of moisture or other contamination, signs of
overheating burn marks which may have been caused by overvoltage surge or transient conditions on
the protection scheme.
Test Intervals
The maintenance tests required will largely depend upon experience and site conditions, but as a
general rule it is recommended that the following inspection and tests are performed every twelve
months.
Mechanical Inspection
Check of Connections
Insulation Resistance Test
Table of contents
