ABB OVR-15 Operation and maintenance manual

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DISTRIBUTION SOLUTIONS
OVR-15, 27 and 38 outdoor vacuum
recloser high voltage unit with SEL-751
Instruction, operation
and maintenance manual

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2OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
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For your safety
• Ensure that the installation location and environment
are suitable for the apparatus.
• Allow installation, commissioning and maintenance
operations to be performed only by qualified
personnel with relevant knowledge of the apparatus.
• Comply with all applicable local and national codes,
standards and working procedures during
installation, commissioning and maintenance.
• Read and strictly follow the information and
instructions provided in this manual.
• Ensure that the rated performance of the apparatus
is not exceeded during service.
• Make certain this manual and the necessary
information for safety intervention are available
to all personnel operating the apparatus.

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Table of contents
1. Introduction 4
1.1. Environmental protection program 4
1.2. X-ray emission standards 4
1.3. End-of -life recycle/disposal 5
1.4. Product-related safety notices 5
1.5. Working on HV cabinets and mandatory safety procedures 6
1.6. Warning texts and symbols 6
2 Packing and transport 7
2.1 Goods marking 7
2.2 Documents 7
2.3 Transport and lifting 7
3 Receipt and storage prior to installation 8
3.1 Receipt of recloser 8
3.2 Storage of recloser 8
3.3 Handling 9
4 Technical details 10
4.1 Table 2: Technical data for OVR-15, 27 and 38 10
5 General description of OVR-15, 27 and 38 recloser 11
5.1 High voltage assembly 11
5.1.1 Housing 11
5.1.2 Recloser pole 12
5.1.3 Current and voltage sensor 12
5.1.4 Single coil magnetic actuator 12
5.1.5 Emergency manual trip (k69) handle 12
5.1.6 Mechanical ON/OFF position Indicator 12
5.1.7 Status auxiliary limit switches 12
6 Standard production tests 13
7 Installation 14
7.1 Tests before installation 14
7.1.1 Vacuum test procedure 14
7.1.2 Contact resistance 15
7.2 Mounting 15
7.2.1 Pole mounting 15
7.3 Grounding 18
7.4 Arrester protection 19
7.5 Line connections 19
7.6 Final inspections before energizing 20
8 Recloser operation 21
8.1 Closing 21
8.2 Opening 21
8.3 Mechanical (manual) opening 21
9 Inspection and maintenance 22
9.1 Activities before doing any maintenance of the recloser HV unit 22
9.2 Table 3: Recommended inspection and maintenance plan 22
10 Typical rating plate details 23
10.1 Rating plate on OVR HV cabinet 23
11 General arrangement drawings 24
11.1 OVR-15 HV cabinet general arrangement 24
11.2 OVR-27 HV cabinet with single voltage sensing general arrangement 25
11.3 OVR-27 HV cabinet with dual voltage sensing general arrangement 26
11.4 OVR-38 HV cabinet general arrangement 27
12 Recommended spare parts 28
12.1 Table 4: List of recommended spare parts for OVR-15, 27 and 38 recloser 28
12 11 07 06 05 04 03 02 010910 08

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4OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
This manual contains the information needed
to install the high voltage (HV) unit of the OVR-15,
27 and 38 auto reclosers and put them into service.
For correct use of the product, please read this
manual carefully along with the instruction,
operation and maintenance manual for the low
voltage (LV) unit.
OVR-15, 27 and 38 reclosers are designed for
different installation configurations. However,
the mounting structure for this apparatus allows
further technical construction modifications
(at the customer’s request) to adapt to special
installation requirements. Consequently, the
information provided in this manual may not
contain instructions for special configurations.
In addition to this manual, it is, therefore, always
necessary to consult the latest technical
documentation (electric circuit and wiring
diagrams, assembly and installation drawings,
any protection coordination studies, etc.),
especially regarding any variants requested
to standardized configurations.
Only use original spare parts for maintenance
operations. For more information, please refer
to the recommended spare parts list included
in this manual.
All installation, commissioning, operation and
maintenance operations must be carried out
by skilled personnel with in-depth knowledge
of the apparatus.
1.1. Environmental protection program
The OVR-15, 27 and 38 reclosers are manufactured
in accordance with ISO 14000 standards (guidelines
for environmental management).
Production processes are carried out in compliance
with the standards for environmental protection
in terms of reduction in energy consumption as well
as in raw materials and production of waste
materials. All this is thanks to the medium voltage
apparatus manufacturing facility environmental
management system.
1.2. X-ray emission standards
One of the physical properties of vacuum is the
possibility of X-ray emission when the interrupter
contacts are open and subjected to high voltage.
Specific tests performed show that local emission
at a distance of 10 cm from the interrupter or pole
surface does not exceed 1 mSv/h. It follows that:
• At the rated service voltage, use of vacuum
interrupters is absolutely safe.
• Application of the withstand voltage at industrial
frequency, according to the IEC 62271-111
standard, is safe.
• Application of a voltage higher than the power
frequency withstand voltage at the industrial
frequency or direct current specified in the IEC
standard is outside the guaranteed operating
limits for the unit and may cause permanent
damage to the unit.
• Limitation of the above-mentioned local
phenomena, with interrupters with open
contacts, depends on keeping the specified
distance between the contacts. This condition
is intrinsically guaranteed by correct operation
of the operating mechanism and adjustments
of the transmission system.
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1 Introduction
01

5INTRODUCTION
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
Raw material Recycle Environmental effects and reuse processes
Iron Yes Separate, use instead of new source (ore)
Stainless steel Yes Separate, use instead of new source (ore)
Copper Yes Separate, use instead of new source (ore)
Brass Yes Separate, use instead of new source (ore)
Aluminum Yes Separate, use instead of new source (ore)
Zinc Yes Separate, use instead of new source (ore)
Thermoplastic Yes Make granulate, re-use or apply as energy superior
Epoxy Yes Additive in refuse incineration
Rubber Yes Cut into pieces and use as high-grade energy
Packing foil Yes Cut into pieces and use for landfills
Wooden pallet Yes High-grade energy additive in refuse incineration

ABB is committed to complying with relevant
legal and other statutory requirements for
environmental protection according to the ISO
14001 standard. It is the duty of the end user
to facilitate end-of-life recycling and disposal
according to applicable regulations.
During disposal of the product, it is important
to follow all local legal requirements in force.
Disposal can be carried out either thermally in
an incineration plant or by storing on a waste site.
Following are the methods of recycle/disposal:
01
1.4. Product-related safety notices
The OVR-15, 27 and 38 reclosers should be installed
within the design limitations as described on the
unit’s nameplate and in these instructions. In
addition, always follow your company’s safety
procedures.
This recloser should not be used by itself as
the sole means of isolating a medium voltage
circuit. For the safety of personnel performing
maintenance operations on the recloser or
connecting equipment, all components should
be electrically disconnected by means of a visible
break and securely grounded.
This manual uses the terms “ground” and
“grounding” as per IEEE. These are equivalent
to IEC terms “earth” and “earthing.”
This manual contains terms and expressions
commonly used to describe this kind of equipment.
These instructions do not attempt to provide
the user of this equipment every possible answer
to questions that may arise in the application,
operation and maintenance of the product.
Detailed descriptions of standard repair
procedures, safety principles and service
operations are not included. It is important to note
that this document contains some warnings and
cautions against some specific service methods
that could cause personal injury to service
personnel or could damage equipment or render
it unsafe. These warnings do not cover every
conceivable method in which service (whether
or not recommended by ABB) may be performed.
Secondly, ABB cannot predict or investigate all
potential hazards resulting from all conceivable
service methods. Anyone using service procedures
or tools, whether or not recommended by ABB,
must be completely certain that both their personal
safety and the safety of the equipment will not be
jeopardized by the service method or tools
selected.
All information contained in this manual is based
on the latest product information available at the
time of printing. The right is reserved to make
changes at any time without notice.
Also, as improvements in assemblies and parts
are made, some parts may differ in appearance
than that depicted in illustrations; however,
functionality will be equivalent.

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6OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
1.5. Working on HV cabinets and mandatory
safety procedures
When work on HV and/or LV units is required,
observe the following mandatory minimum
procedures:
a. Isolate the recloser from the power system
on both sides. Put recloser in OPEN condition
by operating the yellow emergency manual
trip handle. Once the recloser is opened, the
handle locks and blocks close operation both
electrically and mechanically until the handle
is reset to its original (not operated) position.
b. Confirm the OPEN status of the recloser from
the mechanical ON/OFF indicator and from
the indication LEDs on the SEL-751.
c. Switch off all MCBs on LV unit’s swinging door.
d. Follow the safety warning instructions on
various warning labels provided on the LV
and HV units.
e. Remove the control cable from both the HV
and LV cabinets, and cover the 24-pin male
connectors with the plastic caps provided.
Although hazard warnings relate to personal injury,
it is also important to understand that under
certain operational conditions, operation of
damaged equipment may result in degraded
process performance, potentially leading to
personal injury or death. Therefore, comply fully
with all warning and caution notices.
1.5. Warning texts and symbols
Warning texts and symbols are based on different
degrees of urgency, which must be observed
carefully. These are described below.
Danger indicates a hazardous situation which,
if not avoided, will result in death or serious
injury.
Warning indicates a hazardous situation which,
if not avoided, could result in death or serious
injury.
Caution indicates a hazardous situation which,
if not avoided, could result in minor or
moderate injury.
Notice is used when there is a danger that can
lead to equipment damage only.
IMPORTANT
Important indicates an operation
or a suggestion for handling.
Warning symbols
The following warning symbols may appear
on warning labels on the product itself.
The electrical warning icon indicates
the presence of a hazard that could
result in electrical shock.
Dangerous voltages can occur on the
connectors even though the auxiliary
voltage has been disconnected.
Only a competent electrician must
be allowed to carry out the electrical
installation.
National and local electrical safety
regulations must always be followed.
Non-observance can result in death,
personal injury or substantial property
damage.
The warning icon indicates the presence
of a hazard that could result in personal
injury.
The equipment contains components
that are sensitive to electrostatic
discharge. Unnecessary touching of
these electronic components must,
therefore, be avoided.
01

7INTRODUCTION, PACKING AND TRANSPORT
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2 Packing and transport
2.1 Goods marking
The recloser is transported in “Contact OPEN”
position. The HV unit of the factory-assembled
recloser may be transported in a different packing
case than the LV unit and mounting brackets.
Each case is marked on two sides with indelible
black ink. Case markings include information
such as case number, gross weight, etc.
Optional accessories, such as auxiliary power
voltage transformer, terminal connectors, etc.,
may also be transported in a separate case.
In addition to the above, the cases are marked with
the following symbols. These should be observed
when choosing lifting equipment.
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01
2.2 Documents
Documents provided with the recloser during
dispatch include:
• Instruction manual
• Routine test certificate
• Drawings
• Packing list
• Other documents as mutually agreed in contract
with ABB
2.3 Transport and lifting
The recloser must be transported in packed
condition only. Before lifting the case, observe the
information on it (such as symbols, weight, etc.).
The following precautions are to be taken during
lifting:
• Ensure that packing cases are not placed
on wet surfaces/waterlogged areas.
• Reclosers should not be stacked on top
of one another.
• Reclosers should be lifted by a lifting device
equipped with forks or slings. If a crane is used,
slings must be used. The units must not be rolled
or dropped.
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02
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01 General symbols
on packing case
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02 Packing case
lifting arrangement
02

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8OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
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3 Receipt and storage prior to installation
3.1 Receipt of recloser
Each recloser is assembled and tested at the
factory. Prior to shipment, the equipment is
thoroughly inspected to ensure a quality product
free from defects. If damage is noticed, call the
carrier at once for inspection, and request an
inspection report. Afterwards, file a formal claim
with the carrier, supported with the airway/
roadway bill.
Each delivery, on receipt, should be checked for:
• Shortages and discrepancies (verify against
order and delivery documents)
• Any transit damage and material losses
Abnormality, if any, must be reported immediately
to ABB, forwarding agents and the insurance
company.
Instructions and literature packed with the recloser
should be kept with the unit. Additional copies may
be obtained upon request from the local ABB sales
office. Following are the typical parts with which
reclosers are generally shipped from factory.
Default shipment High voltage (HV) cabinet
Control cable (length as per
order-specific drawings)
Optional items
(Only if ordered separately)
Mounting brackets
Auxiliary power cable

Terminal connectors for main
power cable connections
Insulating boots for main
power connections
Auxiliary power voltage
transformers
Any additional spares
3.2 Storage of recloser
The recloser with complete packing should always
be stored indoors to protect it from direct sunlight,
rain or snow. The recloser should be stored in its
original transport units, where they are well
protected from damage.
Reclosers can be stored up to three months from
date of shipment from the factory. For longer
storage, the packing must be removed and the
recloser must be kept under controlled
environmental conditions.
We define storage in controlled conditions
as a place with:
• Leak-proof roof
• Solid, flat ground
• Relative humidity less than 50%
• 
• The heating elements must be connected to the
electric supply to protect the control equipment
from corrosion or freezing damage.
Structures may be stored outdoors with proper
care by avoiding any water accumulation or soil
deposition. Spare parts should be stored indoors
in their original packing.
IMPORTANT
The HV cabinets must be stored in the upright
position to avoid moisture accumulation.
Recommended storage temperature range

If the recloser is not placed into service
immediately, it is essential that proper care
be exercised in handling and storage to ensure
good operating condition in the future. Please
consult ABB if the recloser will be in storage for
an extended period of time before installation.
03

9RECEIPT AND STORAGE PRIOR TO INSTALLATION
3.3 Handling
Each HV cabinet comes with lifting brackets
on the sides of the cabinet for lifting. A four-point
lift using the loops in these brackets is strongly
recommended. The approximate mass in kg
is indicated on the rating plates on HV cabinets.
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03
Exercise care during lifting to avoid damage
to the poles.
Do not place the recloser HV unit on an uneven
surface. Placing the HV unit on an uneven
surface may cause tilting/galling of the HV
unit, causing damage to the equipment and
injuries to nearby personnel.
A spreader bar should be used if necessary
to ensure lifting straps do not press against
and damage the poles or mechanical ON/OFF
indicator.
Do not use a forklift to move the recloser
because it may damage the mechanical
ON/OFF position indicator, yellow trip handle
and associated interlock.
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03 HV cabinet
lifting details
03

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10 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
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4 Technical details
These operating instructions are applicable
to the HV unit of the OVR-15, 27 and 38 medium
voltage, three-phase, mechanically gang-operated
vacuum reclosers.
Each OVR-15, 27 and 38 recloser has three vacuum
interrupters, each assembled in a pole cast from
an advanced hydrophobic cycloaliphatic epoxy
polymer (HCEP). Together with the specialized
control functions, the recloser will sense a pickup
current (or other pre-configured condition) and
automatically open, or “trip.”
After a pre-configured open interval time, the
recloser will close again. If the tripping condition
still exists, the recloser will trip again and reclose.
The OVR-15, 27 and 38 recloser can reclose up to
three times in one operating cycle.
The standard OVR-15, 27 and 38 recloser control,
SEL-751, will allow up to three closing operations
before the recloser will “lock out” in the open
position.
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
No. Technical characteristic   
Installation Outdoor, pole/substation mounting
Suitable as standard 
Rated system voltage   
Rated frequency 
    
Short time current withstand capability   
Fault current breaking capability   
Making current capability   
One-minute power frequency withstand
capability (dry/wet )






 Lightning impulse voltage
withstand capability
  
 Switching of line-charging current   
 Switching of cable-charging current   
 Operating sequence
(reclosing sequence)

 Closing time 
 Opening time 
 Number of operations at rated current 

 Insulating material of poles Hydrophobic cycloaliphatic epoxy polymer (HCEP)
 Type of operating mechanism Magnetic actuator
 Minimum creepage distance   
 Center-to-center distance
between phases
  
 Mass of the auto recloser HV unit
excluding mounting frame (approx.)
  
 Protection class for cabinet (HV and LV) 
 Maximum load on foundations
(inclusive of the mass of the recloser)


 Suitable for wind speed up to 
 Ambient temperature range 
For other technical details, please refer to the order-specific drawings.
04

11TECHNICAL DETAILS, GENERAL DESCRIPTION OF OVR-15, 27 AND 38 RECLOSER
—
5 General description of OVR-15,
27 and 38 recloser
5.1 High voltage assembly
The high voltage assembly of the OVR-15, 27 and 38
consists of three poles mounted onto a common
housing. Each of the poles is a separate assembly
consisting of a vacuum interrupter assembled in
an HCEP molded pole. All three poles are gang
operated by a single coil magnetic actuator through
a common operating shaft.
5.1.1 Housing
The HV unit housing is a stainless steel enclosure
with a removable bottom cover. This housing is
provided with legs for safe transportation and
storage. However, these legs are not intended to
be used for mounting the recloser on its structure.
The HV unit has a dedicated name plate, showing
important rating information, serial number and
manufacturing year, mounted on the front side
of the HV cabinet. The ON/OFF position indicator
is also on the front side and is visible from ground.
A 50 W heater is provided in the HV cabinet
to prevent condensation. The heater must
be energized at all times.
—
04 OVR-15 HV
cabinet overview
—
05 OVR-27/38 HV
cabinet overview
—
05
—
04
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12 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
5.1.2 Recloser pole
Each of the three recloser poles consists of a
vacuum interrupter inside a pole cast from an
advanced hydrophobic cycloaliphatic epoxy
polymer (HCEP). The upper and lower terminals
for connecting medium voltage power conductors
are made of ETP copper.
5.1.3 Current and voltage sensor
Current (I) sensing uses a current transformer
(CT), and voltage (U) sensing uses a voltage divider.
The sensor secondary connections are brought out
of the pole via shielded cables. OVR-15 and 27 offer
the option for either single or dual voltage sensing
per pole.
5.1.4 Single coil magnetic actuator
The recloser is operated by a single coil magnetic
actuator. One actuator gang operates all three
poles through a common shaft mechanism.
The magnetic actuator is bi-stable and does
not require any continuous power to hold it
in the ON or OFF position.
• Disassembly of the magnetic actuator is not
allowed. Lubrication or maintenance is not
required and will void the warranty.
• Should an actuator fail to operate, contact
ABB Customer Service.
5.1.5 Emergency manual trip (K69) handle
A yellow handle on the side of the HV cabinet
housing is provided for mechanically opening the
recloser in an emergency. When viewed from the
front of the cabinet (with rating plate visible), this
handle can be seen on the right-hand side of the
housing. The recloser can be mechanically opened
by pulling this handle from ground level with a
standard hook stick. See the mechanical opening
information in the Operation section of this manual
for details.

The HV cabinet includes a mechanical ON/OFF
position indicator that can be viewed easily from
ground level. The general color convention is:
Close Open
Default color coding Red Green
Option available on request* Green Open
* Please check the order-specific documents to confirm color coding.
5.1.7 Status auxiliary limit switches
The status limit switches are mounted inside the
HV cabinet housing. They are wired to provide
recloser status information to the protection
and control in the LV control cabinet.
05
—
06 OVR-15 pole with
single voltage sensor
—
07 OVR-15 pole with
dual voltage sensor
—
08 OVR-27/38 pole with
single voltage sensor
—
09 OVR-27 pole with
dual voltage sensor
—
08
—
06
—
09
—
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13GENERAL DESCRIPTION OF OVR-15, 27 AND 38 RECLOSER, STANDARD PRODUCTION TESTS
—
6 Standard production tests
Routine tests are performed on the OVR-15, 27
and 38 reclosers with the HV unit connected to its
dedicated LV unit. The standard factory production
tests include:
1. Verification of wiring as per approved wiring
diagram.
2. Electrical operation:
a. Close and open in local/remote modes
b. Overcurrent response and automatic
reclosing through primary injection.
3. Functional checks of manual controls (K69)
and associated electrical and mechanical
close block.
4. Contact resistance measurements on poles.
5. One-minute power frequency voltage withstand
test on primary circuit of HV unit.
6. Partial discharge test.
7. Minimum trip and time-current test.
8. No-load mechanical operation test.
The routine test report with a summary of results
is shipped as a part of the documentation package.
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14 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
—
7 Installation
The OVR-15, 27 and 38 recloser can be installed in a
substation frame or pole-mounting frame, or it can
be mounted into a customer-supplied structure.
Regardless of the frame or structure, all mounting
methods require the recloser to be vertical, leveled
and securely fastened. Follow your company
guidelines and applicable codes for setting the
height of the recloser, securing the frame to the
pole or foundation and making connections.
Before shipping from the factory, the OVR-15,
27 and 38 recloser HV unit is tested as a system
with its dedicated LV control cabinet. The HV unit
and LV control cabinet that were tested together
must be installed together. These units can be
properly matched by the serial number indicated
on each unit’s rating plate.
• All metal mounting frames and structures
must be commonly grounded to the
grounding grid at the installation site.
• For proper operation of the electronic
components, the total impedance of the
grounding grid on site must be less than

• It is also mandatory to ensure that all
grounding connections to the welded star
grounding pad inside the LV cabinet are
always intact and secured.
• Be careful not to bend the cable beyond
a radius of 12 inches to avoid damage
to the cable.
7.1 Tests before installation
7.1.1 Vacuum test procedure
It is recommended to conduct a one-minute
power frequency voltage withstand test on each
interrupter to verify that there has been no loss
of vacuum during transportation or handling.
Experience indicates that a vacuum interrupter
with vacuum seal intact will withstand 40 kV AC
(80% of 50 kV) for OVR-15, 45 kV AC (80% of 60 kV)
for OVR-27 and 56 kV AC (80% of 70 kV) for OVR-38
across the open contacts. The same interrupter
with leaked vacuum (open to normal atmosphere)
will flashover at the gap at a much lower voltage.
Radiation warning
High voltage applied across an open gap in a
vacuum can produce X-ray radiation. However,
no radiation is emitted when the recloser is
closed because no gap exists. Also, X-ray
radiation at one meter is below the concern
level when the recloser is open to the specified
contact spacing during testing (within
specified voltages) or in normal service
conditions. Danger could exist at voltages
above those specified on the rating plate.
For testing, with recloser in open position, connect
all the three upper terminals together with jumpers.
Connect all three lower terminals together with
separate jumper, and ground them to cabinet
housing. Connect the high voltage to the top
terminals.
During testing, it is mandatory that:
• HV and LV cabinets are connected properly
with the control cable.
• Both HV and LV cabinets are securely grounded.
• LV cabinet is placed at least three meters away
from HV cabinet.
• Personnel must stand at least three meters away
from the apparatus before energizing the high
voltage source.
• Do not apply voltage for more than 60 seconds.
If internal flashover occurs, isolate the phases,
and test each one independently to identify
the defective interrupter. Any defective pole
assembly must be replaced prior to the recloser
being installed and placed into service.
07

15INSTALLATION
7.1.2 Contact resistance
Close the recloser with the help of the LV unit
and associated connecting cable. Measure contact
resistance with suitable equipment rated not less
than 100 A DC. The value of contact resistance
for each phase should not exceed 40 micro-ohms.
Ensure that the contact resistance measurement
kit’s current-injection leads are connected only
across the incoming and outgoing terminals
of the pole.
If the vacuum interrupter/complete pole
needs to be replaced, please contact ABB.
7.2 Mounting
The HV cabinet is shipped with mounting frame
as per the type of mounting agreed upon at time
of order. For details, refer to recloser mounting
documents supplied with the order-bound
drawings.
Do not use a forklift to move the recloser
because it may damage the mechanical ON/
OFF position indicator, yellow manual trip
handle and associated interlock.
7.2.1 Pole mounting
For pole-mounting frames, perform the following:
1. Attach the lifting hooks on the sides of the
recloser as indicated in section 3, Handling.
2. Complete the HV cabinet mounting on pole,
as per detailed procedure in this manual.
3. If voltage transformers (VTs) are used, it is
recommended to install the frame without
the VTs and then install them after the recloser
and VT mounting brackets are on the pole.
4. Make sure all hardware is fastened securely.
Do not exceed 750 N cantilever force on any of
the bushing terminals in any direction. Failure
to comply will result in permanent damage.
Follow your company’s procedures for
electrical products/assemblies. This operation
should be performed only after it has been
determined there is no hazardous or unsafe
condition for the operator, such as energized
or live conductors.
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16 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
—
10 General arrangement
for OVR-15, flag-type
mounting structure
—
10
The height of the pole structure and recloser
location shown are for reference only. These
will vary depending on the user’s installation.
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17INSTALLATION
—
11 General arrangement
for OVR-27 and
38 with flag-type
structure mounting
—
11
The height of the pole structure and recloser
location shown are for reference only. These
will vary depending on the user’s installation.
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18 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
7.3 Grounding
IMPORTANT
Always follow international, national, local and
company-specific regulations when grounding
the equipment.
All metal mounting frames and structures must be
commonly grounded to the grounding grid on the
installation site. Grounding is important to ensure
proper operation of all electronic components, as
well as to prevent penetration of EMC noise and
other transients into the sensitive electronic
circuits (SEL-751 relay, ACM, radios, etc.). Each
HV cabinet includes two stainless steel welded
grounding pads for grounding. Each pad has an
internal threaded hole (M8 for HV unit) as shown
in the figure below. 80 sq. mm cross-section, solid
copper strip/equivalent is recommended for
grounding.
If auxiliary power voltage transformer is used, it
should be grounded to the main ground conductor
leading from the recloser HV cabinet to ground. It is
mandatory that the HV cabinet is firmly grounded
as shown in this section when installed.
For the proper operation of electronic components,
the total impedance of the on-site grounding grid

Grounding pad
—
12
1. Surge arrestors not indicated on drawing must
be provided on incoming and outgoing medium
voltage terminals of the recloser.
2. All devices interfacing with the LV cabinet,
including HV cabinet (recloser), auxiliary power
transformer (PT), surge arrestors, etc., must
be connected to the same pole ground.
3. All connections of the LV cabinet must be routed
in close proximity to and parallel with their
corresponding ground paths for adequate
surge protection.
4. The LV control cabinet must be grounded
to its own pole ground.
5. The neutral of the secondary winding
of the auxiliary pole-mounted transformer
must be grounded at the transformer level.
6. The pole-grounding conductor must
be a continuous conductor.
—
13
The grounding cables used must be the same
for all components.
—
12 Provisions for
grounding connections
on HV cabinet
—
13 Grounding
connections proposed
for OVR-15, 27, 38 pole-
mounted arrangement
07

19INSTALLATION
7.4 Arrester protection
Surge arresters can be connected on both high
voltage (source and load) sides of the recloser.
It is recommended that the arrester grounds be
connected to the recloser ground and continued
to the pole ground.
The leads connecting the arresters to the recloser
pole terminals should be as short as possible
to limit stray inductance and to maximize the
arresters’ effectiveness.
7.5 Line connections
The recloser is connected in series with the line.
The medium voltage line conductors are to be
connected to the OVR terminals H1 and H2 via
suitable terminal connectors/clamps. Both these
terminals are silver-plated copper. The fasteners
use for connectors must be torqued between 50
to 60 NM (442 to 531 inch-lb). Respective H1 and H2
terminal line connections for OVR-15 and OVR-27/38
are shown in the figures below.
The general convention for power connection is H1
terminal on the source side and H2 terminal on the
load side. However, the terminals can be connected
in reverse order if site requirements dictate.
If a voltage transformer (PT) is used for providing
external AC auxiliary power to the LV cabinet, it is
recommended to connect the PT on the source side
of the recloser so that auxiliary power is available
even if the recloser is in open condition during
service. This will avoid unnecessary draining of
recloser battery backup power.
—
14 Line connections
for OVR-15 pole
—
15 Line connections
for OVR-27 SVS pole/
OVR- 38 pole
—
16 Line connections
for OVR-27 DVS pole
26 | Page
Instruction Manual for HV Unit of OVR-15, 27 & 38
LLIINNEECCOONNNNEECCTTIIOONNSS
The recloser is connected in series with the line. The medium voltage line conductors are to be connected to the OVR terminal H1
& H2 via suitable terminal connector/clamp. Both these terminals are silver plated copper. The fasteners use for connectors must
be torqued between 50 to 60 NM (442 to 531 inch lbf). Respective H1 and H2 terminals Line connections for OVR-15 and OVR-
27/38 are shown in the below pictures
General convention proposed for power connection is H1 terminal should be on the source side and H2 on load side. However,
based on site requirements, these terminals can be connected in reverse order as well.
Fig-17: Line connections for OVR-15 Pole
Fig-17.1: Line connections for OVR-27 SVS Pole / OVR- 38 Pole
Plain terminal Dia. 1”
Plain terminal Dia. 1”
27 | Page
Instruction Manual for HV Unit of OVR-15, 27 & 38
If a voltage transformer (PT) is used for providing external AC auxiliary power to the LV cabinet, then it is recommended to
connect this PT on the source side of the recloser so that auxiliary power is available even if the recloser is in open condition
during service. This will avoid unnecessary draining of recloser battery back-up power.
FFIINNAALLIINNSSPPEECCTTIIOONNSSBBEEFFOORREEEENNEERRGGIIZZIINNGG
The recloser should be tested for mechanical and electrical operation before it is energized in the power system. It is to be noted
that the recloser is shipped in OPEN (OFF) condition from the factory.
Do not ground either side of the battery or attach ground to the terminals of the actuator
operating coils. This will result in permanent damage to the unit.
When the recloser has been installed completely with all mechanical and electrical connections completed, conduct following
mandatory inspection before energizing the recloser on the main lines;
1. Ensure the recloser is properly levelled and securely anchored.
2. Make a final check of tightness of all hardware.
3. Securely tighten terminals and ground connections.
4. Check control cable is properly connected, routed and secured.
5. Ensure both the HV & LV cabinets are grounded as mentioned in this manual.
CCaauuttiioonn
Fig.-17.2: Line connections for OVR-27 DVS Pole
26 | Page
Instruction Manual for HV Unit of OVR-15, 27 & 38
LLIINNEECCOONNNNEECCTTIIOONNSS
The recloser is connected in series with the line. The medium voltage line conductors are to be connected to the OVR terminal H1
& H2 via suitable terminal connector/clamp. Both these terminals are silver plated copper. The fasteners use for connectors must
be torqued between 50 to 60 NM (442 to 531 inch lbf). Respective H1 and H2 terminals Line connections for OVR-15 and OVR-
27/38 are shown in the below pictures
General convention proposed for power connection is H1 terminal should be on the source side and H2 on load side. However,
based on site requirements, these terminals can be connected in reverse order as well.
Fig-17: Line connections for OVR-15 Pole
Fig-17.1: Line connections for OVR-27 SVS Pole / OVR- 38 Pole
Plain terminal Dia. 1”
Plain terminal Dia. 1”
—
14
—
15
—
16
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20 OVR-15, 27 AND 38 OUTDOOR VACUUM RECLOSER HIGH VOLTAGE UNIT WITH SEL751
7.6 Final inspections before energizing
The recloser should be tested for mechanical and
electrical operation before it is energized in the
power system. Note that the recloser is shipped
in the OPEN (OFF) condition from the factory.
Do not ground either side of the battery or
attach ground to the terminals of the actuator
operating coils. This will result in permanent
damage to the unit.
Once the recloser has been installed fully with all
mechanical and electrical connections completed,
conduct the following mandatory inspection before
energizing the recloser on the main lines:
1. Ensure that the recloser is properly leveled
and securely anchored.
2. Perform a final check to ensure all hardware
is tightened.
3. Securely tighten terminals and ground
connections.
4. Verify that control cable is properly connected,
routed and secured.
5. Ensure that both the HV and LV cabinets
are grounded as described in this manual.
07