background image

3

Instructions for installation, use and 

maintenance for current instrument 

transformers

1. Service conditions

The transformers need to be installed in indoor 
conditions where the ambient air is not signifi-
cantly polluted by dust, smoke, corrosive gases, 
vapor or salts.
The transformers are designed for standard ambi-
ent temperatures between -20°C and +105°C and 
altitudes below 1 000 m above sea level. The trans-
formers can also be operated at higher or lower 
ambient air temperatures and higher installation 
altitudes if such are agreed with the manufacturer. 

2. Technical details

Technical parameters and specifications of each 
of the transformers are shown on a rating plate 
fixed to the transformer body. It is not allowed to 
operate the transformer at values exceeding the 
rating plate data. 

Dimensional drawing of AT transformer is shown 
in Appendix 1. Dimensions of the transformer 
may vary and depend on required parameters and 
the application they are intended for. This is why 
the customer is required to specify the highest or 
lowest dimensions, in line with the dimensional 
drawing in Appendix 1.

Where:

1)

type code of transformer

2)

corresponding standard

3)

rated short-time thermal current

4)

rated dynamic current

5)

rated frequency

6)

terminal marking for tap of transformer

7)

rated transformer ratio

8)

extended current

9)

rated output (burden)

10)

accuracy classes

11)

year of manufacture

12)

serial number

Label abbreviation definitions

3. Instruction for installation

General information
Instrument transformer is an electrical equip-
ment and the electrical installation of the instru-
ment transformer can be done by skilled person-
nel, only. The level of experience, age and 
eligibility criteria for persons working with, on or 
near electric installations is governed by national 
legislation. If no such eligibility legislation is avail-
able the corresponding requirements can be 
found in EN 50110-1 standard.

Safety instructions
1. 

 Always consider the transformer as a 
part of electric circuit which it is con-
nected to. 
Don´t touch incoming connectors and 
terminals, or any other parts of the 
transformer, except you know for sure 
these are earthed.


01


01  Example of rating 
plate

These installation, use and maintenance instructions apply for current instrument 
transformers intended for outdoor operation. The instructions refer to current 
instrument transformers of the following types: 
AT41 –  up to 10 000 A; up to 1.2/6/- kV 40 kA(1s) and 100 kA
AT35 –  up to 5 000 A; up to 1.2/6/- kV 100 kA(1s) and 120 kA
AT38 –  up to 5 000 A; up to 1.2/6/- kV 100 kA(1s) and 120 kA

CURRENT TRANSFORMER

Type: AT41-1055/670

1

IEC 60044-1

2

1,2/6/- kV

Ith:30(1s) kA

3    

Idyn:75 kA

4

50 Hz

5

2014

11

Serial:1VLTS114000007

12

1S1-1S2

6

3 000/1A

7

ext.120%

8

3 VA

9

cl.TPY

10

Rb=3 Ohm, Kssc=10, Tp=100 ms
C-O-C-O t´-t´ al-tfr-t´´-t´´al=100-60-500-100-60 ms
Rct=10 Ohm, Ts=1,00 s, Ktd=27,2

Summary of Contents for AT35

Page 1: ... PRODUCTS FOR HIGH VOLTAGE APPLICATION AT Current Instrument Transformer Instruction for Installation use and maintenance ...

Page 2: ...ructions 4 Mounting 4 Connection of transformer primary side 4 Connection of transformer secondary side 4 4 Instructions for use 5 Routine test report 5 5 Maintenance instructions before installation 5 6 Transport Storage 5 7 Disposal 5 8 Handling 5 9 Normative references 6 10 Dimensions 5 11 Lifetime 5 12 Service 7 Appendix 1 Examples of outlets 8 Appendix 2 Dimensional drawings AT35 and AT41 Dim...

Page 3: ...ended current 9 rated output burden 10 accuracy classes 11 year of manufacture 12 serial number Label abbreviation definitions 3 Instruction for installation General information Instrument transformer is an electrical equip ment and the electrical installation of the instru ment transformer can be done by skilled person nel only The level of experience age and eligibility criteria for persons work...

Page 4: ...hreaded rots are delivered on cus tomer request Connection of transformer primary side The AT transformers don t have its own primary conductor The primary conductor is designed as a bushing with its own insulation or insulated ca ble Connection of the transformer secondary side Secondary outlets are marked by color Which color is assigned to which wire you can see in ta ble below Outlets marking ...

Page 5: ...rage the transformers have to be pro tected from direct impact of solar radiation The transformers are delivered in wooden crates or fixed on transport pallets Transported transformers must be protected to avoid any damages Right option of transport must be wisely chosen 7 Disposal Materials used in instrument transformers are considered as materials without environmental impact and materials are ...

Page 6: ...ed IEC 60044 1 IEC 60044 6 IEC 61869 2 AS 60044 1 ČSN EN 60044 1 ČSN EN 60044 6 IEEE Std C57 13 6 2005 ANSI C57 13 1978 CSA Std CAN3 C13 M83 BS EN 60044 1 When agreed transformers made in accordance with other standards can also be supplied or in accordance with other release version of the above standards 10 Dimensions Dimensions of the current transformers acc ap pendix 2 11 Lifetime The product...

Page 7: ...7 Appendix 1 Examples of outlets ...

Page 8: ...d depends on customer request The fixing parts are a part of a delivery mounting parts can be ordered separately as an attachment Testing primary Secondary outlets SIGN VALUE Variant C NOTE Variant C with optional testing primary see catalogue and optional length of secondary outlets depending on customer request The fixing part are a part of delivery mounting parts can be ordered separately as an...

Page 9: ...ry secondary outlets screening electrodes is optional and depends on customer request The fixing parts are a part of a delivery mounting parts can be ordered separately as an attachment AT38 Testing primary Secondary outlets Secondary electrodes 1000 1 0 0 0 ...

Page 10: ...le lack of information in this document We reserve all rights in this document and in the subject matter and illustrations con tained therein Any reproduction disclosure to third parties or utilization of its contents in whole or in parts is forbidden without prior written consent of ABB Copyright 2018 ABB All rights reserved C O N TA C T U S ABB s r o EPDS Brno Videnska 117 619 00 Brno Czech Repu...

Reviews: