ABB TDO 6 Parts list manual

Type: TDO 6, TJO 6, TJO 7,
VOG-24, VOL-24, VOL-40.5
Instruction for installation,
use and maintenance
Outdoor voltage transformers

2 Instruction manual
1. General description 4
2. Service conditions 4
3. Technical details 5
4. Instruction for installation 6
4.1 General 6
4.2 Checking voltage transformers upon arrival 6
4.3 Preparations before installation of voltage transformers 6
4.4 Safety instructions 6
4.5 Mounting 7
4.5.1 Primary connection 7
4.5.2 Secondary connections 8
5. Maintenance and overviews during exploitation 10
5.1 Maintenance 10
5.2 Overviews during exploitation 10
6. Instruction for use 10
7. Package, transport and storage 11
8. Disposal 11
9. Voltage transformer handling 11
10. Normative references 12
11. Wiring diagram examples 12
12. Connections of voltage transformers – examples 14
13. Dimensional Drawings 17
TDO 6 17
TJO 6 18
TJO 7 19
VOG-24 20
VOL-24 21
VOL-40.5 22
Content

Instruction manual 3
Safety instructions
Warning – please read the notes which
aremarked with this sign carefully.
Installation, connection, operation and maintenance
should be carried out by authorized personnel only.
This manual should always be accessible for the user’s
personnel.
Voltage transformers are high voltage devices and must
be used according to the appropriate safety rules!

4 Instruction manual
1. General description
The voltage transformers are designed to supply measurement
and protection circuits in high voltage power networks (with
admissible voltage up to 40.5 kV and frequency 50 Hz or 60 Hz).
The instruction includes the following types of voltage
transformers:
– TJO 6, TJO 7, VOG-24– voltage transformers single-pole,
– TDO 6, VOL-24, VOL-40.5 – voltage transformers double-pole.
Design versions may differ depending on:
– dimensions,
– rated primary voltage (insulation level),
– secondary voltage,
– rated power in given accuracy class,
– thermal burden.
Examples of voltage transformers design (TDO 6, TJO 7 type) are
shown in the Figure No. 1 and 2.
2. Service conditions
The voltage transformers should be mounted in outdoor
conditions where the ambient air may be polluted by dust, smoke,
corrosive cases, vapours or salt. The voltage transformers are
designed for standard ambient temperature between -40°C and
+40°C and altitude lower than 1000 m above the sea level. The
average value of the ambient temperature, measured over a
period of 24 hours, should not exceed 35°C.
The transformers may be used also in higher or lower ambient
temperatures and higher altitudes when agreed between the
manufacturer and purchaser.
Figure 1. An example of the construction of a double-pole transformer
(based on transformer TDO 6)
Figure 2. An example of the construction of a single-pole transformer
(based on transformer TJO 7)
1 – Primary winding,
2 – Secondary Winding,
3 – Magnetic core,
4 – Epoxy resin housing, insulation
5 – Terminal primary winding,
6 – Terminal box of the terminals secondary windings,
7 – Steel baseplate with earthing terminal
1
5
5
3
7
7
2
6
4
1
5
3
7
2
6
4

Instruction manual 5
3. Technical details
The technical details for each individual voltage transformer are
indicated on the rating plate fastened on the voltage transformer.
Parameter values indicated on the rating plate must not be
exceeded
Description markings on the nameplate:
 SN: 1YMP015TJO00460
Type: TJO 7
Order No.:548856#130
33000:V3/110:V3/110:3 V/V/V
Prod.No.:30218656#12
 SN: 1YMP015TJO00460
Type: TJO 7
Order No.:548856#130
33000:V3/110:V3/110:3 V/V/V 1.9/8h
f:50Hz Amb.T.:40°C
a-n 33000:V3/110:V3 V/V 50VA cl.0.5
da-dn 33000:V3/110:3 V/V 100VA cl.6P
36/70/170kV
IEC 61869-3
700VA
Made by ABB
t.cl.E
2015
Figure 3a. Example of VT’s rating plate (TJO 7 type).
Figure 3b. Example of VT's rating plate (VOL-40.5).
SN: 1YMP015TJO00460 Serial number
Type: TJO 7 Transformer type code
f: 50 [Hz] Rated frequency
33000:√3/100:√3/100:3 [V] Rated voltage ratio
a-n Terminal marking for first secondary winding
da-dn Terminal marking for auxiliary secondary
winding (for open delta connection)
50VA, 100 [VA] Rated power
0.5, 6P Accuracy classes
36/70/170[kV]
Highest voltage for equipment /
power-frequency withstand voltage / rated
lightning-impulse voltage
IEC 61869-3 Standards
2015 Year of production
t.cl.E Temperature class
700 [VA] Thermal limiting output
1.9/8h Voltage factor
Amb.T.: 40°C Ambient temperature
Order No.: 548856#130 Order number
Voltage transformers weight
Voltage transformer type Weight [kg]
VOG-24 app. 39
VOL-24 app. 43
VOL-40.5 app. 70
TJO 7 app. 55
TJO 6 app. 57
TDO 6 app. 60

6 Instruction manual
4. Instruction for installation
4.1 General
A voltage transformer is a piece of electrical equipment and its
electrical installation shall be done by skilled person only. Observe
the provisions of local legislation regarding the minimum age and
the competence criteria for personnel working with or in vicinity of
electrical installations.
If local legislation is not applicable, the guidelines set forth in EN
50110-1 shall be observed.
4.2 Checking voltage transformers upon arrival
Inspection shall be made upon arrival of voltage transformer for
any signs of damage or tampering incurred during shipment.
Make sure that voltage transformer parameters
indicated on the rating plate comply with the
parameters specified on the order!
If:
–there are any damages in the shipment,
–voltage transformer has been damaged,
–or voltage transformer ratings do not comply with order
specification,
notify the carrier and contact the voltage transformer
manufacturer. Keep the written record of damages until complaint
resolution.
4.3 Preparations before installation of voltage transformers
Perform a visual inspection of the voltage transformer prior to
installation paying particular attention to the following points:
–cast resin (enclosure) is in good condition,
–voltage transformer terminals and surfaces of housing and base
are clean and without visible mechanical damages,
–there are no signs of moisture on the voltage transformer; in
case of visible signs of moisture, the voltage transformer must
be dried,
–voltage transformer ratings comply with technical specification of
connection.
Prior to installation of the voltage transformer perform the following
measurements:
a) measurement of insulation resistance of primary
winding:
–insulation resistance of unearthed transformer (with
two insulated primary terminals) shall not be lower than
1000MΩ, use 2,5 kV coil megaohmmeter to measure
the resistance between short-circuited terminals of
primary winding and base,
–insulation resistance of earthed transformer (with one insulated
primary terminal) shall not be lower than 200MΩ. Use 1 kV coil
megaohmmeter to measure the resistance between short-
circuited terminals of primary winding and base.
Prior to measurements of insulation resistance for
earthed transformer (with one insulated primary ter-
minal) remove an earthing screw from “N” terminal
in terminal strip and remember to reattach it after
completing measurements.
b) measurement of insulation resistance of secondary
windings:
–insulation resistance of secondary windings insulation
shall not be lower than 50 MΩ. Use 1 kV coil
megaohmmeter for measurements.
Prior to measurements of insulation resistance of se-
condary windings remove earthing screws in one of
the terminals of each secondary winding, if screwed
in. Reattach these earthing screws and ground one
of the terminals according to voltage transformer
connection diagrams.
4.4 Safety instructions
a)Installed voltage transformer shall be always considered as part
of interconnected circuit. Never attempt to touch the leads,
terminals or other parts of the voltage transformer unless they
are known to be properly connected and ground.
b)Always ground the metal base of voltage transformer.
c) If secondary winding is earthed at several points, only the same
terminal of secondary winding may be used for grounding.
Check with care if both terminals of the same secondary
winding are not grounded by accident. Grounding both
terminals of secondary winding can result in damage of voltage
transformer over a short period of time. Any claims for resulting
transformer damages will be void.
d)If auxiliary secondary windings of earthed transformers (single-
pole insulated) are connected to open delta, only one node of
open delta circuit may be earthed.
e)If two unearthed voltage transformers (double-pole insulated)
operate in V-connection, only one of the two terminals of
secondary winding may be earthed.

Instruction manual 7
4.5 Mounting
General and detailed information regarding mounting procedure
may differ depending on voltage transformer type and version.
Follow the technical specifications included in catalogues,
dimensional drawings and rating plates for specific voltage
transformer type and mounting instructions.
Outdoor voltage transformer may be mounted in vertical position
only (with terminal of primary winding facing the top). For other
mounting positions consult the manufacturer. Fasten the voltage
transformer metal baseplate using the four M10 screws with
washers or with two metal profiles and M12 screws depending on
the version of voltage transformer. An M8 or M12 earthing screw
is available on the baseplate for grounding the voltage transformer,
depending on version (see dimensional drawing for exact location).
Tightening torque for steel screws used in voltage transformers
Screw Min. Torque [Nm] Max. torque [Nm]
M5 2.8 3.5
M6 3 4
M8 16 20
M10 20 35
M12 56 70
Maximum allowed torque for primary terminals screw connections is 20 Nm.
4.5.1 Primary connection
– Terminal screw connections may be tightened with maximum
allowed torque of 20 Nm.
– Maximum allowed cantilever strength is 1000 N.
The primary terminals are located on the top surface of voltage
transformers (see dimensional drawings).
Figure 4. Primary terminals for double-pole insulated VT – TDO 6 – nuts M10.
Figure 5. Primary terminal for single-pole insulated VT – TJO 6 – nut M10.
Figure 6. Primary terminal for single-pole insulated VT – TJO 7 – nut M12.
Figure 7. Primary terminal for single-pole insulated VT – VOG-24 – nut M10.
Figure 8. Primary terminals for double-pole insulated VT – VOL-24 – nuts M10.
Figure 9. Primary terminals for double pole insulated VT – VOL-40.5 – nuts M12.

8 Instruction manual
4.5.2 Secondary connections
Terminals, terminal screws, nuts and washers are made of brass
or stainless steel. The terminal box is provided with one or two
PG21 cable gland. The secondary terminals are provided with
M6 screws for wiring connections. The cover of the terminal box
is provided with lead seal lock. In outdoor voltage transformers
degree of IP54 protection for terminal boxes.
Figure 10. Examples of voltage transformers terminal boxes – TDO 6.
Fig. 10a. Designation of the secondary windings
Figure 11. Examples of voltage transformers terminal boxes – TJO 6.
Fig.11a. Designation of the secondary windings
Figure 12. Examples of voltage transformers terminal boxes – TJO 7.
Fig.12a Designation of the secondary windings

Instruction manual 9
Figure 13. Examples of voltage transformers terminal boxes – VOG-24.
Fig.13a. Designation of the secondary windings
Figure 14. Examples of voltage transformers terminal boxes – VOL-24.
Fig.14a. Designation of the secondary windings
Figure 15. Examples of voltage transformers terminal boxes with fuse as
option – VOL-40.5.

10 Instruction manual
5. Maintenance and overviews during exploitation.
5.1 Maintenance
Excessive dust or other kind of pollution must be brushed off the
transformer. Polluted transformers can be cleaned with spirit,
petrol or toluene. Traces of arcs and minor surface damages can
be easily removed with sandpaper after which the surface is to be
treated by applying a thin layer of silicone paste on it. Instruction
for repairing greater surface damages must be requested from the
manufacturer.
5.2 Overviews during exploitation
Medium voltage instrument transformers in resin insulation are
maintenance-free. However, because of work under different
environmental conditions during the transformer operation it is
advisable to carry out:
– overview of the instrument transformer during operation – only
visual control,
– overview of the instrument transformer disconnected from
power supply.
Time periods between inspections is regulated by standards,
by operation and maintenance manual of switchgears or user
requirements.
Overview of the instrument transformer during operation
The review is based on visual control in accordance with the
principles of safety. During the inspection should pay attention to:
– condition of resin body,
– condition of primary terminals,
– condition of support structures.
Overview of the instrument transformer disconnected from
power supply
The overview should be done every time before restarting. The
overview should include:
– cleaning the surface of instrument transformer,
– checking condition of the transformer resin body surface,
– checking condition of mounting screws and checking the
condition of all electrical connections (on primary and secondary
terminals and earthing terminals),
– measurement of main insulation resistance,
– measurement of secondary winding insulation resistance.
Cut off the power supply of transformer before
attempting cleaning or repairing operations.
6. Instruction for use
The main tasks of voltage transformers are:
– to transform voltages from a usually high value to a value easy to
handle for relays and instruments, while maintaining appropriate
accuracy class, and to power supply to the metering circuit,
– to insulate the metering circuit from the primary high voltage
system,
– supply other low voltage devices do not require a high standard
of accuracy, such as disconnectors drives
For applications that use a power supply
transformer, the transformer is recommended to
use double-pole voltage transformer. In the case
of single-pole voltage transformer secondary side
can rise to 190% of rated voltage, which can cause
permanent damage to the powered device and the
transformer. Using double-pole voltage transformer
should be one of the ends secondary winding
grounded. An example of such a connection is
shown below in Fig. 16.
Using voltage transformers for purposes other than described
above is forbidden, if not otherwise agreed with its manufacturer.
Figure.16. An example of connecting the receiver to the secondary terminal
winding of the double-pole voltage transformer.

Instruction manual 11
7. Package, transport and storage
Admissible temperature range for storage and transport of voltage
transformers is -40°C to +70°C. Voltage transformers must be
protected from exposure to direct sunlight during transport and
storage. Voltage transformers shipped for domestic customers
are packed in wooden crates or according to customer’s
specification. Voltage transformers shipped for abroad customers
are packed in wooden crates. Voltage transformer should be
shipped in position according to symbols and marks indicated on
its packing case and protected against weather conditions. They
should be stored in dry and clean places, protected from direct
exposure to precipitation and solar radiation
8. Disposal
Materials used in instrument transformers are considered as
materials without dangerous environmental impact and materials
are not toxic. Disposal of instrument transformers is controlled by
national legislation of communal waste.
9. Voltage transformer handling
Voltage transformers equipped with eye bolts may be handled by
means of chains and crane. Screw the eye bolts directly to the
U profile or the baseplate and attach to the crane’s hook using
chains. This handling method is recommended for the majority
of voltage transformers equipped with baseplate and weight
exceeding 25 kg, mainly types: TDO 6, TJO 6, TJO 7, VOG-24,
VOL-24, VOL-40.5 (see figure 17).
Figure 17. Example of handling voltage transformer VOL-24.

12 Instruction manual
Load capacity for chains/loops/crane must be no
less than 200 kg. Always make sure that chains/
loops are properly and safely attached to the crane’s
hook and that the voltage transformer is properly
secured.
Observe the work safety rules during voltage trans-
former handling operations. Never stay under the
suspended loads. Always make sure that the voltage
transformer is safely attached to the crane’s hook
and there is no risk of load falling or tipping over.
10. Normative references
Voltage transformers are: designed, tested and manufactured
according to international or national standards specified by cus-
tomers and confirmed by manufacturer. Normative reference for a
given voltage transformer is always indicated on the transformer’s
rating plate.
Standard examples:
IEC 61869-1; IEC 61869-3; IEC 60044-2; GOST 1983-2001.
On requests, voltage transformers may be designed and
manufactured in accordance with other revisions of standard
or standards specified above upon a prior agreement between
manufacturer and purchaser.
11. Wiring diagram examples
Figure 18. Electric schemes
a) Single-pole insulated voltage transformer with one secondary winding
b) Single-pole insulated voltage transformer with one secondary, tapped
winding
c) Single-pole insulated voltage transformer with one secondary winding and
one auxiliary winding (for open delta connection)
d) Single-pole insulated voltage transformer with two secondary, tapped
windings

Instruction manual 13
e) Single-pole insulated voltage transformer with two secondary windings and
one auxiliary winding
f) Single-pole insulated voltage transformer with two secondary windings
g) Single-pole insulated voltage transformer with three secondary windings
h) Single-pole insulated voltage transformer with two secondary, tapped wind-
ings, one of which is auxiliary winding (for open delta connection)
i) Double-pole insulated voltage transformer with one secondary winding
j) Double-pole insulated voltage transformer with one secondary, tapped
winding
k) Double-pole insulated voltage transformer with two secondary windings
l) Double-pole insulated voltage transformer with two secondary, tapped
windings

14 Instruction manual
12. Connections of voltage transformers - examples
Connection name Wiring diagram Application
With one
double-pole transformer
Line voltage measurement.
Both poles of the transformer have to be fully
insulated.
With one
single-pole transformer
Line to ground voltage measurement.
One pole of the transformer should be fully
insulated.
Star connection with
broken delta system
Line to ground voltage and residual voltage
measurement.
One pole of the transformer should be insulated.
Star connection
Line to line voltage measurement.
Connection may have an broken delta system for
residual voltage measurement.
One pole of the transformer should be insulated.

Instruction manual 15
Star connection Line to line and line to ground voltage
measurement.
Connection may have an broken delta forresidual
voltage measurement.
One pole of the transformer should be insulated.
Receivers are connected for line to ground
measurement.
Both poles of the transformer have to be fully
insulated.
Receivers are connected for line to line voltage
measurement.
Both poles of the transformer have to be fully
insulated.
Connection name Wiring diagram Application

16 Instruction manual
Two receivers are connected for line to line
voltage measurement.
Both poles of the transformer have to be fully
insulated.
Connection name Wiring diagram Application

Instruction manual 17
330
30
340
67
30
474
325
499
M10
IP54
Rating
plate
300
180
230
175
4x 14
50
320
450
410
M12x30
PG21
M6
Weight: 60kg
Creepage distance: 1250mm
13. Dimensional Drawings
TDO 6

18 Instruction manual
512
30
340
30
67
325
486
Rating
plate
M10
IP54
50
412
PG21
M12x30
M6
300
175
180
332
230
4x 14
Weight: 57kg
Creepage distance: 1250mm
TJO 6

Instruction manual 19
55
33
450
170
680
637
375
M12
IP54
Rating
plate
5
R125
115
PG21
M6
M8
310
190
220
340
4x 12
Weight: 52-55kg
Creepage distance: 1120mm
55
33
450
170
680
637
375
M12
IP54
Rating
plate
5
R125
115
PG21
M6
M8
310
190
220
340
4x 12
Weight: 52-55kg
Creepage distance: 1120mm
TJO 7

20 Instruction manual
36
19
339
188
290
480
507
452
M10
IP54
145
198
Rating
plate
PG21
M8
M6
375
250 300
305
4x 12x25
Weight: 39kg
Creepage distance: 800mm
VOG-24