Laboratorio Electrotecnico AEP-7 User manual

USER MANUAL
CURRENT AND VOLTAGE
INSTRUMENT TRANSFORMERS
División Transformadore s
s
Passatge dels Rosers, s/n
08940 Cornellá de Llobregat
Barcelona (ESPAÑA)
Phone: [phone] Fax: [phone]
e-mail: [e-mail]
Website: www.lescop.com

1/6
User Manual
.
1. TECHNICAL CHARACTERISTICS
2. REGULATION
Unless the customer specifies other features and/or requests to those stipulated in the
manufacturing standards, the technical characteristics that must be established to correctly
define the equipment are given below:
Voltage transformer
•Transformation ratio. (Example: 27500: √3 / 110: √3 V)
•Insulation level. (Example: 36 kV)
•Burden and class of all secondary circuits. (e.g.: 1st sec. 10 VA Class 0.2; 2nd sec. 25 VA
Class 3P)
•Voltage factor. (Example: 1.2 in permanence, 1.9 during 8 hours, etc.))
•Rated frequency: 50 Hz, unless otherwise specified.
•Manufacturing standard or customer specification: IEC 61869.
•Simultaneous burden: NO, unless otherwise specified.
•Indoor or outdoor service.
Current transformer
•Transformation ratio. (Example: 15-30 / 5-5 A)
•Insulation level. (Example: 36 kV)
•Burden and class of all secondary circuits. (e.g.: 1st sec. 15 VA Class 0.2S; 2nd sec. 30
VA Class 5P10)
•Surge factor in permanence or extended range. (Example: 150% of In)
•Rated frequency: 50 Hz, unless otherwise specified.
•Manufacturing standard or customer specification: IEC 61869.
•Thermal short-circuit current. (e.g.: Ith= 3 kA or 200 x In A, in 1 sec)
•Dynamic short-circuit current: 2.5 Ith, unless otherwise specified.
•Safety factor (Fs), for measurement transformers: ≤ 5, unless otherwise specified.
•Protection limit factor (Flp) for protection transformers.
•Indoor or outdoor service.
The use of this equipment is limited to the following conditions:
➢Maximum installation altitude: 1000 metres above sea level.
➢Maximum variation of service temperature between +40ºC and -25ºC.
➢Not very contaminated atmosphere.
When service and/or transport conditions differ to those reflected, this must be notified and
expressly indicated when requesting the offer of the material, and in the order acceptance.
Possible damage caused to the equipment due to lack of information given to the
manufacturer in this regard will not be attributable to him or to his representatives.
The manufacture of our equipment is based on compliance with the following regulations:
▪IEC 61869-1:2010. Instrument transformers. P1: General requirements.
▪IEC 61869-2:2013. Instrument transformers. P2: Additional requirements for current
transformers.
▪IEC 61869-3:2012. Instrument transformers. P3: Additional requirements for inductive
transformers.

2/6
User Manual
3. INSTALLATION
3.1 Assembly
Indoor equipment can be mounted in any position, taking all the precautions and abiding by legal
or regulatory provisions.
Outdoor equipment must only be mounted in upright position.
VKE type models must be handled correctly in order not to damage the outer metal coating. The
transformer must be repaired if there is visible deterioration.
3.2 Installation
The equipment is intended to be installed in networks with neutral to earth (earth fault factor 
1.4). In the event that the neutral system was not effectively grounded, consult Laboratorio
Electrotécnico for the possibility of installing the equipment.
Instrument transformers must be installed in appropriate places such as fenced substations,
buildings, modules with enclosures or similar, that do not allow access to dangerous parts by
people and that protect the equipment against foreign objects.
They must also be installed so that no person can access them without first disconnecting the line
that feeds them to access safely by controlled means (blockages, operating procedures, etc.).
3.3 Connection
All the terminals corresponding to the transformation ratios requested are properly and indelibly
marked on the transformed surface, and reference is made to the necessary connection for each
ratio on the equipment name plate.
The equipment is supplied with all the necessary connection elements.
The connections will be made as indicated on the name plate, taking special care when tightening
the terminals, and in the provision of the ratio change connections for those current transformers
that have them.
The tightening torque of these terminals, depending on the metrics used, is given below:
- For M6 terminals 2.5 N.m - For M12 terminals 20 N.m
- For M10 terminals 11 N.m - For M16 terminals 45 N.m
Models VKE-24 and VKE-36 must be connected via the specific bushing.
The connection between the bushing and the transformer is made by pressure, keeping the
contact parts as clean as possible and lubricated with non-conductive silicone. The bushing will
be secured to the transformer via the hook or the screws supplied with it:

3/6
User Manual
4. HANDING AND TRANSPORTATION
Recommendations:
▪The secondary winding/s of the transformer must be connected to earth via any of its
terminals.
▪All the transformers have an earth tap in the base, and all of them must be connected to earth
via an appropriate terminal.
▪Check all connections before putting the installation into operation, or connecting it to the
mains, to make sure that they have been tightened properly and there is no element in short-
circuit or with a connection that might cause a defect.
▪Clean the parts close to all the terminals before commissioning.
WARNING!
▪In current transformers, never leave the secondary in open circuit, as this could
cause irreparable damage to the equipment.
▪In voltage transformers, never leave the secondary in short-circuit, as this could
cause irreparable damage to the equipment. Furthermore, the n terminals must
always be earthed.
4.1 Models and weights
The weights of standardised appliances are shown in the table below:
CURRENT
VOLTAGE
Model
Kg
Model
Kg
Model
Kg
Model
Kg
AEP-7
5
AED-36
55
VKPE-12
20
VKE-24
28
AED-12
16
AKWF-24/36
58
VKPE-24
25
VKE-36
40
AER-24
13
AFP-52
225
VKPE-36
30
AEB-24
16
AKBF-0.6(1)
10
VCB-7
26
VKEF-24
99
AEC-24P
25
AKBF-0.6(2)
20
VCB-12
26
VKEF-36
99
AED-24
38
AKBF-0.6(3)
25
VCF-12
33
VFP-52
127
AER-36
18
AKBF-0.6(4)
30
VCF-24
33
AEB-36
27
AKH-01
5
AEC-36
37
AKH-02
4,5
The weights indicated correspond to the maximum weights of each model, with approximately 10%
tolerance.
The weights indicated do not include packaging. Different types of packaging can be used:
cardboard box for transformers weighing less than 40 kg, without box on stretch-wrapped pallet,
wooden cage when they weigh 40 kg or more, etc.

4/6
User Manual
5. MAINTENANCE
6. GUARANTEE
7. ENVIRONMENT INFORMATION
DANGER
This electrical device is connected to dangerous voltages and contains
moving parts that act at high speed. Contact with these risks can result in
death, serious injury or damage to the equipment.
Only qualified personnel can install, operate and maintain this equipment. Always comply
with the “5 golden rules” for electrical work: disconnect; prevent any possible feedback; verify
the absence of tension; ground and short; and protect against live elements and signal the
area. The use of unspecified or unauthorized parts to repair the equipment or the trapping of
safety devices may result in dangerous conditions that can cause death, serious personal
injury or damage to the equipment. Follow all safety instructions contained in this manual.
8. ELECTRIC RISK
4.2 Elevation and transportation means
Outdoor appliances that require a mechanical elevation system due to their weight, incorporate
adequate elements. Eyebolts that adapt to the metrics of the equipment terminals in question can
be used to lift all other appliances, using the actual transformer terminals as the fastening base to
elevate them.
Given the construction characteristics of these appliances, precautions must be taken with
respect to the possibility of the blows being received by the fragile parts of the bobbins and of the
primary terminals.
Model AFP-52 is packed in wooden cages, which protect the porcelain from any impact. Do not
take the transformer out of the cage until it is absolutely necessary. The appliance comes with
transport anchor points on the base, which must be used to secure the transformer. The
appliance must be secured with a flexible transport element that does not harm the porcelain and
that is sufficiently resistant (refer to weight table). Some eyebolts are placed in the transformer
terminals. The fastening element must be passed through these eyebolts to prevent the
transformer from swaying during transportation and location. Once in the definite location the
eyebolts must be removed.
WARNING! Never transport the appliance via the eyebolts in the terminals.
These appliances do not require maintenance, unless installation conditions, such as the
accumulation of damp, dust, ice, chemical residues, etc. on the surface can cause a reduction
of the electrical distance of the equipment, and therefore represent an operating danger. In this
case, the surface must be periodically cleaned.
It is advisable to verify the correct state of the contacts of the primary and secondary terminals
from time to time as well as their grip quality.
The equipment must be totally disconnected, with all the supply-free terminals earthed, to carry
out any maintenance operations.
Provided that the conditions indicated above are respected and against any manufacturing
defect:
•2-year guarantee from the moment the appliance leaves the factory.
Electric and electronic appliances are contaminating material controlled by the Regional Ministry
for the Environment of each Community. At the end of the working life of the transformers, they
must be managed as indicated in the European Waste Catalogue for the CER corresponding
to the group of “Waste electrical and electronic equipment”.

5/6
User Manual
PRIMARY
SECONDARY
P1
P2
SINGLE PRIMARY RATIO
DOUBLE PRIMARY RATIO
Series Parallel
1 SECONDARY
2 SECONDARIES
1 SECONDARY WITH TAP (*)
3 SECONDARIES (**)
P2
P1
P2
P1
C2
C1
C2
C1
2S2
2S1
P1
P2
1S2
1S1
P1
P2
S1
S2
S3
S2
P1
P2
S1
2S2
2S1
P1
1S2
1S1
P2
3S2
3S1
(*) When S1 -S3 is connected,
S2 must remain on air.
Short-circuit those secondaries not in use.
9. CONNECTION DIAGRAM CURRENT Transformers

6/6
User Manual
ONE INSULATED POLE TWO INSULATED POLES
PRIMARY
SECONDARY
SECONDARY
T
S
R
A
N
PRIMARY
T
S
R
A
B
A
N
a
n
1 SECONDARY
dn
da
A
N
n
a
1 SECONDARY +
1 SEC for RESIDUAL VOLTAGE
2 SECONDARIES
2n
2a
A
N
1n
1a
2 SECONDARIES +
1 SEC for RESIDUAL VOLTAGE
2n
2a
A
1n
1a
N
dn
da
1 SECONDARY WITH TAP
n
a2
A
N
a1
RESIDUAL VOLTAJE
SECONDARY CONNECTION
da
dn
da
dn
da
dn
resistance
Phase R
Phase S
Phase T
1 SECONDARY
A
B
a
b
2 SECONDARIES
2b
2a
A
B
1b
1a
1 SECONDARY WITH TAP
b
a2
A
B
a1
In voltage transformers, never short-circuit the secondaries.
10. CONNECTION DIAGRAM VOLTAGE Transformers

User Manual
TRANSFORMERS DIVISION
Passatge dels Rosers, s/n
08940 Cornellà de Llobregat
Barcelona (ESPAÑA)
Telf.: 93 376 31 00 Fax: [phone]
e-mail: [email protected]
web: www.lescop.com
TR122019.0