MR VACUTAP VR I HD-Ex Installation and operation manual

On-Load Tap-Changer
VACUTAP® VR I HD-Ex
Installation and Commissioning Instructions
5293014/00 EN

© All rights reserved by Maschinenfabrik Reinhausen
Dissemination and reproduction of this document and use and disclosure of its content are strictly prohibited
unless expressly permitted.
Infringements will result in liability for compensation. All rights reserved in the event of the granting of patents,
utility models or designs.
The product may have been altered since this document was published.
We reserve the right to change the technical data, design and scope of supply.
Generally the information provided and agreements made when processing the individual quotations and orders
are binding.
The original operating instructions were written in German.

Table of contents
Maschinenfabrik Reinhausen GmbH 2017 35293014/00 EN VACUTAP® VR I HD-Ex
Table of contents
1Introduction......................................................................................................................... 8
1.1 Manufacturer....................................................................................................................................... 8
1.2 Subject to change without notice......................................................................................................... 8
1.3 Completeness...................................................................................................................................... 8
1.4 Safekeeping......................................................................................................................................... 9
1.5 Notation conventions........................................................................................................................... 9
1.5.1 Symbols................................................................................................................................................................. 9
1.5.2 Hazard communication system........................................................................................................................... 10
1.5.3 Information system.............................................................................................................................................. 11
2Safety................................................................................................................................. 13
2.1 Appropriate use................................................................................................................................. 13
2.2 Fundamental safety instructions........................................................................................................ 14
2.3 Standards and regulations................................................................................................................. 15
2.3.1 Application range of the on-load tap-changer..................................................................................................... 15
2.3.2 Standards and regulations.................................................................................................................................. 18
2.4 Measures for ensuring compliance with explosion protection requirements..................................... 18
2.4.1 Measures taken by the manufacturer.................................................................................................................. 18
2.4.2 Measures to be taken by the transformer manufacturer/operator....................................................................... 18
2.5 Personnel qualification...................................................................................................................... 22
2.6 Personal protective equipment.......................................................................................................... 23
3Product description.......................................................................................................... 25
3.1 Scope of delivery............................................................................................................................... 25
3.2 On-load tap-changer.......................................................................................................................... 25
3.2.1 Function description............................................................................................................................................ 25
3.2.2 Setup/models...................................................................................................................................................... 26
3.2.3 Name plate.......................................................................................................................................................... 31
3.3 Drive shaft......................................................................................................................................... 31
3.3.1 Function description............................................................................................................................................ 31
3.3.2 Design/Model...................................................................................................................................................... 33
3.3.3 Identification plate............................................................................................................................................... 35
3.4 Protective relay.................................................................................................................................. 35
3.4.1 Function description............................................................................................................................................ 35
3.4.2 Setup/versions..................................................................................................................................................... 36

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3.4.3 Name plate.......................................................................................................................................................... 37
4Packaging, transport and storage................................................................................... 38
4.1 Packaging.......................................................................................................................................... 38
4.1.1 Suitability............................................................................................................................................................. 38
4.1.2 Markings.............................................................................................................................................................. 38
4.2 Transportation, receipt and handling of shipments............................................................................ 39
4.3 Storage of shipments......................................................................................................................... 40
4.4 Unpacking shipments and checking for transportation damages...................................................... 41
5Mounting............................................................................................................................ 42
5.1 Preparatory work............................................................................................................................... 42
5.1.1 Fitting mounting flange on transformer cover...................................................................................................... 43
5.1.2 Fitting stud bolts on mounting flange................................................................................................................... 43
5.2 Installing the standard version on-load tap-changer in the transformer............................................ 44
5.2.1 Fastening on-load tap-changer to transformer cover.......................................................................................... 44
5.2.2 Connecting the tap winding and on-load tap-changer take-off lead.................................................................... 56
5.2.3 Carrying out transformer ratio test before drying................................................................................................. 64
5.2.4 Measuring DC resistance on transformer............................................................................................................ 65
5.2.5 Drying on-load tap-changer in autoclave............................................................................................................. 66
5.2.6 Drying on-load tap-changer in transformer tank.................................................................................................. 68
5.2.7 Carrying out transformer ratio test after drying.................................................................................................... 89
5.3 Installing on-load tap-changer in transformer (bell-type tank version)............................................... 90
5.3.1 Inserting on-load tap-changer into supporting structure...................................................................................... 90
5.3.2 Connecting the tap winding and on-load tap-changer take-off lead.................................................................. 100
5.3.3 Carrying out transformer ratio test before drying............................................................................................... 108
5.3.4 Measuring DC resistance on transformer.......................................................................................................... 109
5.3.5 Drying on-load tap-changer in autoclave........................................................................................................... 110
5.3.6 Lifting top part of on-load tap-changer head off supporting flange (bottom part).............................................. 112
5.3.7 Fit the bell-type tank and connect the on-load tap-changer to the top part of the on-load tap-changer head... 121
5.3.8 Drying on-load tap-changer in transformer tank................................................................................................ 134
5.3.9 Carrying out transformer ratio test after drying.................................................................................................. 156
5.4 Filling the oil compartment of the on-load tap-changer with oil....................................................... 157
5.5 Fitting protective devices and drive components............................................................................. 158
5.5.1 Connecting the tap-change supervisory device................................................................................................ 158
5.5.2 Installing protective relay in piping and connecting........................................................................................... 159
5.5.3 Fitting motor-drive unit....................................................................................................................................... 168

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5.5.4 Fitting drive shaft............................................................................................................................................... 168
5.5.5 Centering on-load tap-changer and motor-drive unit......................................................................................... 192
5.5.6 Installing electrics for motor-drive unit............................................................................................................... 192
6Commissioning the on-load tap-changer at the transformer manufacturer's site... 193
6.1 Bleeding on-load tap-changer head and suction pipe..................................................................... 193
6.1.1 Bleeding on-load tap-changer head.................................................................................................................. 193
6.1.2 Bleeding suction pipe on pipe connection S...................................................................................................... 194
6.2 Grounding the on-load tap-changer................................................................................................. 194
6.3 Performing tests on motor-drive unit............................................................................................... 196
6.4 Performing trial tap-change operations........................................................................................... 196
6.5 High-voltage tests on the transformer............................................................................................. 197
7Transporting transformer to the operating site........................................................... 199
7.1 Transport with removed drive.......................................................................................................... 199
7.2 Transport with oil fill and without oil conservator............................................................................. 199
7.3 Transport without oil fill.................................................................................................................... 200
7.3.1 Emptying oil compartment via pipe connection S.............................................................................................. 200
8Commissioning the transformer at the operating site................................................ 202
8.1 Checking motor-drive unit................................................................................................................ 202
8.2 Checking protective relay................................................................................................................ 203
8.2.1 Checking protective relay (RS 2001, 2001/V, 2001/H, 2001/E, 2001/5, 2001/R, 2003).................................... 203
8.2.2 Checking protective relay (RS 2004)................................................................................................................. 204
8.3 Filling the oil compartment of the on-load tap-changer with oil....................................................... 204
8.4 Bleeding on-load tap-changer head and suction pipe..................................................................... 206
8.4.1 Bleeding on-load tap-changer head.................................................................................................................. 206
8.4.2 Bleeding suction pipe on pipe connection S...................................................................................................... 207
8.5 Performing trial tap-change operations........................................................................................... 207
8.6 Commissioning the transformer....................................................................................................... 208
9Fault elimination.............................................................................................................. 209
9.1 Tripping of the protective relay and re-commissioning the transformer........................................... 211
9.1.1 Flap valve in IN SERVICE position................................................................................................................... 212
9.1.2 Flap valve in OFF position................................................................................................................................. 212
9.1.3 Re-commissioning the transformer................................................................................................................... 212
10 Technical data................................................................................................................. 213

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10.1 Limit values for dielectric strength and water content of on-load tap-changer oil............................ 214
10.2 Technical data for protective relay................................................................................................... 215
10.2.1 Protective relay with several dry-reed magnetic switches................................................................................. 216
11 Drawings.......................................................................................................................... 217
11.1 VACUTAP® VRC/VRE-Ex, installation drawing (899992)............................................................... 217
11.2 VACUTAP® VRC/VRE-Ex, installation drawing (743600)............................................................... 218
11.3 VACUTAP® VRD/VRF-Ex, installation drawing (899898)............................................................... 219
11.4 VACUTAP® VRD/VRF-Ex, installation drawing (743601)............................................................... 220
11.5 VACUTAP® VRG-Ex, installation drawing (899945)....................................................................... 221
11.6 VACUTAP® VRG-Ex, installation drawing (743602)....................................................................... 222
11.7 VACUTAP® VRC/VRE-Ex, installation position of tap selector connection contacts (727042)...... 223
11.8 VACUTAP® VRC/VRE-Ex, installation position of tap selector connection contacts (743603)...... 224
11.9 VACUTAP® VRD/VRF/VRG-Ex, fine tap selector connection contact and change-over selector
connection contact (899941)........................................................................................................... 225
11.10 VACUTAP® VR-Ex, special design for bell-type tank installation (720781).................................... 226
11.11 VACUTAP® VR-Ex, lifting device for bell-type tank installation (720845)....................................... 227
11.12 VACUTAP® VR-Ex, on-load tap-changer head (720847)............................................................... 228
11.13 Pipe connection Q with tap-change supervisory control (766161).................................................. 229
11.14 VACUTAP® VR-Ex, adjustment positions (728557)....................................................................... 230
11.15 VACUTAP® VRC/VRE-Ex, adjustment plan without change-over selector (719853)..................... 231
11.16 VACUTAP® VRC/VRE-Ex, adjustment plan without change-over selector (742422)..................... 233
11.17 VACUTAP® VRD/VRF-Ex, adjustment plan without change-over selector (721089)..................... 235
11.18 VACUTAP® VRD/VRF-Ex, adjustment plan without change-over selector (742423)..................... 237
11.19 VACUTAP® VRC III/VRC II/VRE III-Ex, adjustment plan with reversing change-over selector
connection (719850)........................................................................................................................ 239
11.20 VACUTAP® VRC I/VRE I-Ex, adjustment plan with reversing change-over selector connection
(719851).......................................................................................................................................... 240
11.21 VACUTAP® VRD/VRF-Ex, adjustment plan with reversing change-over selector connection
(721092).......................................................................................................................................... 241
11.22 VACUTAP® VRD/VRF-Ex, adjustment plan with reversing change-over selector connection
(745024).......................................................................................................................................... 242
11.23 VACUTAP® VRG-Ex, adjustment plan with reversing change-over selector connection (727074).......
243
11.24 VACUTAP® VRG-Ex, adjustment plan with reversing change-over selector connection (742424).......
244
11.25 VACUTAP® VRC/VRE-Ex, adjustment plan with coarse tap selector connection (719852)........... 245
11.26 VACUTAP® VRC/VRE-Ex, adjustment plan with coarse tap selector connection (742425)........... 246

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Maschinenfabrik Reinhausen GmbH 2017 75293014/00 EN VACUTAP® VR I HD-Ex
11.27 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 10, 2-5 coarse tap connections (731412)............................................................. 247
11.28 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 10, 2-5 coarse tap connections (745032)............................................................. 248
11.29 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 12, 2-5 coarse tap connections (731411)............................................................. 249
11.30 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 12, 2-5 coarse tap connections (745031)............................................................. 250
11.31 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 14, 2-5 coarse tap connections (731410)............................................................. 251
11.32 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 14, 2-5 coarse tap connections (745030)............................................................. 252
11.33 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 16, 2-5 coarse tap connections (731000)............................................................. 253
11.34 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 16, 2-5 coarse tap connections (745029)............................................................. 254
11.35 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 18, 2-5 coarse tap connections (730977)............................................................. 255
11.36 Adjustment plan VACUTAP® VRC-Ex with multiple coarse change-over selector for change-over
selector division 18, 2-5 coarse tap connections (745028)............................................................. 256
11.37 VACUTAP® VRD/VRF-Ex, adjustment plan with coarse tap selector connection (721091)........... 257
11.38 VACUTAP® VRD/VRF-Ex, adjustment plan with coarse tap selector connection (742426)........... 258
11.39 VACUTAP® VRG-Ex, adjustment plan with coarse tap selector connection (727075)................... 259
11.40 VACUTAP® VRG-Ex, adjustment plan with coarse tap selector connection (742427)................... 260
11.41 Tracing template for on-load tap-changer head (890183)............................................................... 261
11.42 Socket wrench for kerosene drain plug (723015)............................................................................ 262
11.43 Screw tools for installation and maintenance (723016)................................................................... 263
11.44 Bevel gear CD 6400, dimensional drawing (892916)...................................................................... 264

1 Introduction
Maschinenfabrik Reinhausen GmbH 20178 5293014/00 ENVACUTAP® VR I HD-Ex
Introduction
This technical file contains detailed descriptions of the safe and proper in-
stallation, connection, and commissioning of the product.
It also includes safety instructions and general information about the prod-
uct.
Information about operation can be found in the operating instructions.
This technical file is intended solely for specially trained and authorized per-
sonnel.
Manufacturer
The product is manufactured by:
Maschinenfabrik Reinhausen GmbH
Falkensteinstraße 8
93059 Regensburg, Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Further information on the product and copies of this technical file are avail-
able from this address if required.
Subject to change without notice
The information contained in this technical file comprises the technical speci-
fications approved at the time of printing. Significant modifications will be in-
cluded in a new edition of the technical file.
The document number and version number of this technical file are shown in
the footer.
Completeness
This technical file is incomplete without the supporting documents.
The following documents apply:
▪ Unpacking instructions (included in the scope of delivery)
▪ Supplement (included in the scope of delivery)
▪ Routine test report (included in the scope of delivery)
▪ Connection diagrams (included in the scope of delivery)
▪ Dimensional drawings (included in the scope of delivery)
▪ Technical data - General section (available on request)
▪ Technical data - Product-specific section (available on request)
1
1.1
1.2
1.3

1 Introduction
Maschinenfabrik Reinhausen GmbH 2017 95293014/00 EN VACUTAP® VR I HD-Ex
Safekeeping
Keep this technical file and all supporting documents ready at hand and ac-
cessible for future use at all times.
Notation conventions
This section contains an overview of the symbols and textual emphasis
used.
Symbols
Symbol Meaning
Wrench size
Tightening torque
Number and type of fastening material used
Fill with oil
Cut open, cut through
Clean
Visual inspection
Use your hand
Adapter ring
Apply a coat of paint
Use a file
Grease
1.4
1.5
1.5.1

1 Introduction
Maschinenfabrik Reinhausen GmbH 201710 5293014/00 ENVACUTAP® VR I HD-Ex
Symbol Meaning
Coupling bolt
Use a ruler
Use a saw
Hose clip
Wire eyelet, safety wire
Use a screwdriver
Apply adhesive
Lock tab
Table 1: Symbols
Hazard communication system
Warnings in this technical file are displayed as follows.
Warning relating to section
Warnings relating to sections refer to entire chapters or sections, sub-sec-
tions or several paragraphs within this technical file. Warnings relating to
sections use the following format:
WARNING Type and source of danger
Consequences
► Action
► Action
Embedded warning information
Embedded warnings refer to a particular part within a section. These warn-
ings apply to smaller units of information than the warnings relating to sec-
tions. Embedded warnings use the following format:
1.5.2
1.5.2.1
1.5.2.2

1 Introduction
Maschinenfabrik Reinhausen GmbH 2017 115293014/00 EN VACUTAP® VR I HD-Ex
DANGER! Instruction for avoiding a dangerous situation.
Signal words and pictograms
The following signal words are used:
Signal
word
Meaning
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 injury.
NOTICE Indicates measures to be taken to prevent damage to
property.
Table 2: Signal words in warning notices
Pictograms warn of dangers:
Pictogram Meaning
Warning of a danger point
Warning of dangerous electrical voltage
Warning of combustible substances
Warning of danger of tipping
Table 3: Pictograms used in warning notices
Information system
Information is designed to simplify and improve understanding of particular
procedures. In this technical file it is laid out as follows:
1.5.2.3
1.5.3

1 Introduction
Maschinenfabrik Reinhausen GmbH 201712 5293014/00 ENVACUTAP® VR I HD-Ex
Important information.

2 Safety
Maschinenfabrik Reinhausen GmbH 2017 135293014/00 EN VACUTAP® VR I HD-Ex
Safety
This technical file contains detailed descriptions on the safe and proper in-
stallation, connection, commissioning and monitoring of the product.
▪ Read this technical file through carefully to familiarize yourself with the
product.
▪ This technical file is part of the product.
▪ Read and observe the safety instructions provided in this chapter in par-
ticular.
▪ Observe the warnings in this technical file in order to avoid function-re-
lated dangers.
▪ The product is manufactured on the basis of state-of-the-art technology.
Nevertheless, risks to life and limb of the user or impairment of the prod-
uct and other material assets may occur during use due to function-re-
lated dangers.
Appropriate use
The product is an on-load tap-changer and keeps the output voltage of a
transformer constant. The product is designed solely for use in electrical en-
ergy systems and facilities. If used as intended and in compliance with the
requirements and conditions specified in this technical file as well as the
warning notices in this technical file and attached to the product, then the
product does not present any danger to people, property or the environment.
This applies across the entire service life of the product, from delivery to in-
stallation and operation through to disassembly and disposal.
The following is considered appropriate use:
▪ Use the product only with the transformer specified in the order.
▪ The serial numbers of on-load tap-changers and on-load tap-changer
accessories (drive, drive shaft, bevel gear, protective relay, etc.) must
match if the on-load tap-changers and on-load tap-changer accessories
are supplied as a set for one order.
▪ You will find the standard valid for the product and the year of issue on
the nameplate.
▪ Operate the product in accordance with this technical file, the agreed-
upon delivery conditions and the technical data.
▪ Ensure that all necessary work is performed by qualified personnel only.
▪ Only use the equipment and special tools included in delivery for the in-
tended purpose and in accordance with the specifications of this techni-
cal file.
▪ The on-load tap-changer is not intended to be used with an oil filter unit.
▪ The measures described in this technical file must be taken in order to
comply with explosion protection requirements.
2
2.1

2 Safety
Maschinenfabrik Reinhausen GmbH 201714 5293014/00 ENVACUTAP® VR I HD-Ex
Fundamental safety instructions
To prevent accidents, disruptions and damage as well as unacceptable ad-
verse effects on the environment, those responsible for transport, installa-
tion, operation, maintenance and disposal of the product or parts of the prod-
uct must ensure the following:
Personal protective equipment
Loosely worn or unsuitable clothing increases the danger of becoming trap-
ped or caught up in rotating parts and the danger of getting caught on pro-
truding parts. This increases the danger to life and limb.
▪ All necessary devices and personal protective equipment required for
the specific task, such as a hard hat, safety footwear, etc. must be worn.
Observe the section "Personal protective equipment" [► 23].
▪ Never wear damaged personal protective equipment.
▪ Never wear rings, necklaces, or other jewelry.
▪ If you have long hair, wear a hairnet.
Work area
Untidy and poorly lit work areas can lead to accidents.
▪ Keep the work area clean and tidy.
▪ Make sure that the work area is well lit.
▪ Observe the applicable laws for accident prevention in the relevant
country.
Working during operation
You must only operate the product when it is in a sound operational condi-
tion. Otherwise it poses a danger to life and limb.
▪ Regularly check the operational reliability of safety equipment.
▪ Comply with the maintenance work and maintenance intervals descri-
bed in this technical file.
Explosion protection
Highly flammable or explosive gases, vapors and dusts can cause serious
explosions and fire.
▪ Do not install the product in potentially explosive areas.
Safety markings
Warning signs and safety information plates are safety markings on the
product. They are an important aspect of the safety concept.
▪ Observe all safety markings on the product.
▪ Make sure all safety markings on the product remain intact and legible.
▪ Replace safety markings that are damaged or missing.
2.2

2 Safety
Maschinenfabrik Reinhausen GmbH 2017 155293014/00 EN VACUTAP® VR I HD-Ex
Ambient conditions
To ensure reliable and safe operation, the product must only be operated
under the ambient conditions specified in the technical data.
▪ Observe the specified operating conditions and requirements for the in-
stallation location.
Auxiliary materials and operating materials
Auxiliary materials and operating materials not approved by Maschinenfabrik
Reinhausen GmbH could damage the product.
▪ Only use lubricants and auxiliary materials approved by the manufactur-
er.
▪ Contact Maschinenfabrik Reinhausen GmbH.
Modifications and conversions
Unauthorized or inappropriate changes to the product may lead to personal
injury, material damage and operational faults.
▪ Only modify product following consultation with Maschinenfabrik Rein-
hausen GmbH.
Spare parts
Spare parts not approved by Maschinenfabrik Reinhausen GmbH may
cause physical injury and damage the product.
▪ Only use spare parts approved by the manufacturer.
▪ Contact Maschinenfabrik Reinhausen GmbH.
Standards and regulations
The standards and regulations which apply to the explosion-protected prod-
uct are described in the following chapters.
Application range of the on-load tap-changer
The on-load tap-changer is certified for Ex II 3G Ex nAC IIC T3 Gc. Refer to
the following overview for the resulting application range.
1 2 3 4 5 6 7 8
II 3G Ex nAC IIC T3 Gc
Table 4: Example of the application range
Number Meaning
1Sign for explosion protection
2 Equipment group
3 Equipment category
2.3
2.3.1

2 Safety
Maschinenfabrik Reinhausen GmbH 201716 5293014/00 ENVACUTAP® VR I HD-Ex
Number Meaning
4Ex: Symbol for explosion-protected equipment
5 Ignition protection type
6 Explosion group
7 Temperature class
8 EPL (Equipment Protection Level)
Equipment groups (number 2)
IEquipment in this category is intended for use in under-
ground parts of mines as well as those parts of surface in-
stallations of such mines endangered by firedamp and/or
combustible dust.
II Equipment in this category is intended for use in other
areas in which explosive atmospheres may be present.
Table 5: Equipment groups
Equipment category / zone classification (number 3)
Designa-
tion for
gases
Designa-
tion for
dusts
Definition
1G
(0)
1D
(20)
Equipment in this category is intended for
use in areas in which explosive atmospheres
caused by mixtures of air and gases, vapors
or mists or by air/dust mixtures are present
continuously, for long periods or frequently.
2G
(1)
2D
(21)
Equipment in this category is intended for
use in areas in which explosive atmospheres
caused by gases, vapors, mists or air/dust
mixtures occur occasionally.
3G
(2)
3D
(22)
Equipment in this category is intended for
use in areas in which explosive atmospheres
caused by gases, vapors, mists, or air/dust
mixtures are unlikely to occur or, if they do
occur, are likely to do so only infrequently
and for a short period only.
Table 6: Equipment category / zone classification
Ignition protection types (number 5)
dPressure-proof enclosure
e Increased safety
I Intrinsic safety (ia, ib)
m Encapsulation
o Oil immersion
p Pressurized apparatus

2 Safety
Maschinenfabrik Reinhausen GmbH 2017 175293014/00 EN VACUTAP® VR I HD-Ex
q Powder filling
nIgnition protection type "n" (only zone 2)
n A: non-sparking equipment
n C: sparking equipment with special protection for con-
tacts
n R: vapor-protected housing
Table 7: Ignition protection types
Explosion group (number 6)
EN/IEC Gases, vapors (examples) Min. ignition energy
(mJ)
IIA Ammonia -
IIA Acetic acid, acetone, benzene,
diesel, ethane, ether, fuel oil, hex-
ane, methane, petrol, petroleum,
propane
0.18
IIB Ethylene, isoprene, town gas 0.06
IIC Acetylene, carbon disulfide, hy-
drogen
0.02
Table 8: Explosion groups
Temperature classes (number 7)
Tempera-
ture class
Maximum equipment surface
temperature
Ignition tempera-
ture of the flamma-
ble substances
T1 450 °C > 450 °C
T2 300 °C > 300 °C < 450 °C
T3 200 °C > 200 °C < 300 °C
T4 135 °C > 135 °C < 200 °C
T5 100 °C > 100 °C < 135 °C
T6 85 °C > 85 °C < 100 °C
Table 9: Temperature classes
Equipment protection level (EPL) (number 8)
The EPL indicates the level of protection defined for a device based on the
level of probability of ignition and taking account of the differences between
potentially explosive gas atmospheres, potentially explosive dust atmos-
pheres, and potentially explosive atmospheres in mine workings affected by
firedamp.

2 Safety
Maschinenfabrik Reinhausen GmbH 201718 5293014/00 ENVACUTAP® VR I HD-Ex
Standards and regulations
The following standards and regulations apply to explosion-proof on-load
tap-changers:
▪ EN 60079-0: Equipment – General requirements
▪ EN 60079-15: Equipment protection by type of protection "n"
▪ Additional requirements apply to vacuum interrupters, as these are her-
metically sealed devices that generate arcs, sparks or hot surfaces.
▪ Additional requirements apply to the diverter switch oil compartment, as
this is a sealed or encapsulated device that generates arcs, sparks or
hot surfaces.
Measures for ensuring compliance with explosion
protection requirements
Measures taken by the manufacturer
Maschinenfabrik Reinhausen has taken the following measures for ensuring
compliance with explosion protection requirements. You do not need to take
any special measures in this regard.
Quality of the insulating oil in the on-load tap-changer
The quality of the insulating oil required by IEC 60296 and the quality of the
synthetic esters required by IEC 61099 in the oil compartment of the on-load
tap-changer is ensured by using vacuum cells in transition resistors.
Monitoring the oil temperature in the diverter switch oil compartment
A temperature sensor is provided in the on-load tap-changer head cover for
monitoring the oil temperature in the diverter switch oil compartment. The
corresponding temperature monitoring relay is in the TAPMOTION® ED-Ex.
Temperature monitoring prevents further switching of the on-load tap-chang-
er when the maximum permitted temperature is reached. This maximum per-
mitted temperature is factory-configured for each specific order for all on-
load tap-changer types (maximum 130 °C) and secured against accidental
incorrect adjustment.
Measures to be taken by the transformer manufacturer/operator
The following measures for ensuring compliance with explosion protection
requirements must be taken by the transformer manufacturer/operator.
2.3.2
2.4
2.4.1
2.4.1.1
2.4.1.2
2.4.2

2 Safety
Maschinenfabrik Reinhausen GmbH 2017 195293014/00 EN VACUTAP® VR I HD-Ex
Prescribed protective and drive components
Operate the on-load tap-changer only in conjunction with the following com-
ponents:
▪ Ex protective relay
▪ Ex motor-drive unit
▪ Ex drive shaft
2.4.2.1

2 Safety
Maschinenfabrik Reinhausen GmbH 201720 5293014/00 ENVACUTAP® VR I HD-Ex
Setting up the on-load tap-changer oil system
Operate the on-load tap-changer only with a suitable oil system. This divert-
er switch oil system consists of the diverter switch oil compartment, protec-
tive relay, and oil conservator of the on-load tap-changer. It ensures that
enough insulating oil is present in the diverter switch oil compartment at all
times.
Figure 1: On-load tap-changer oil system
1 Diverter switch oil compart-
ment
5 Signaling contacts
2 Temperature sensor 6 Oil conservator
3 Protective relay 7 Dehydrating breather
4 Level indicator
Oil conservator to be used
The oil conservator of the on-load tap-changer ensures that sufficient insu-
lating oil is present in the on-load tap-changer oil system at all times during
operation.
Therefore, operate the on-load tap-changer only with a oil conservator that
fulfills the following requirements:
2.4.2.2
2.4.2.3