-
8/10/2019 Checklist for Type Approvals of Instrument
Transformers
1/3
Physikalisch-Technische BundesanstaltBraunschweig and Berlin
AG 2.34 Type Approval & Conformi ty Assessment
Checklist for type approvals of instrument transformers
Applied national requirements and ordinances
PTB-Anforderungen 20.2Eichordnung Anlage20; Abschnitt
2PTB-Testing Instructions for Instrument Transformers
International standard:
EN 60044-1 for current transformersEN 60044-2 for inductive
voltage transformers
(1) Informal application for type approval with:
(2) Description of:
design and mode of operation of the instrument transformer
safety measures taken locations of main mark and protective
mark
(3) Informative photographs of the transformer
(4) Drawing of:
rating plate dimensional drawing sectional drawing core
(5) Block diagram indicating the terminal markings (EN
60044-1/-2)
(6) Example of a calculation of the transformer:
calculations easy to reconstruct Mllinger-Gewecke diagram
magnetization curve
(7) Technical data current and voltage transformers:
rated insulation level and class of insulation
rated primary current / voltage rated secondary current /
voltage rated output rated fequency number of measurement ranges
accuracy class extended measurement ranges (current transformer)
number of measuring cores number of cores rated short-time thermal
current Ith(current transformer) rated voltage factor; rated time;
rated thermal output (voltage
transformer)
(8) Test sample(s) in arrangement with working group 2.34
Physikalisch -Techn ische Bundesanstalt, Bundesallee 100 D-38116
Braunschweig, vers. 2008-08-05. Allrights r eserved, No part may be
reproduced without the prior wri tten permission o f PTB
-
8/10/2019 Checklist for Type Approvals of Instrument
Transformers
2/3
(9) Current transformer:
Type tests:
Short-time current tests EN 60044-1 (7.1)
Temperature rise test PTB-A 20.2 (4.6)EN 60044-1 (7.2)
Lightning impulse test EN 60044-1 (7.3.2)
Switching impulse test EN 60044-1 (7.3.3)
Wet test for outdoor type transformers EN 60044-1 (7.4)
Determinations of errors of the testsample
EO-20.2 (3.1.1)PTB-A 20.2 (4)PTB-Testing Instructions (3.4)
Routine tests:
Verifications of terminal markings EN 60044-1 (8.1)
Power-frequency withstand tests onprimary winding
EN 60044-1 (8.2.1)
Partial discharge measurement EN 60044-1 (8.2.2)
Power-frequency withstand tests onsecondary winding
EN 60044-1 (8.3/14.4.4)
Power-frequency withstand testsbetween sections EN 60044-1
(8.3/14.4.4)
Inter-turn overvoltage test EN 60044-1 (8.4/14.4.5)
Determinations of errors of the testsample
EO-20.2 (3.1.1)PTB-A 20.2 (4)PTB-Testing Instructions (3.4)
Physikalisch -Techn ische Bundesanstalt, Bundesallee 100 D-38116
Braunschweig, vers. 2008-08-05. Allrights r eserved, No part may be
reproduced without the prior wri tten permission o f PTB
-
8/10/2019 Checklist for Type Approvals of Instrument
Transformers
3/3
(10) Voltage transformer:
Type tests:
Short-circuit withstand capability test EN 60044-2 (8.2)
Temperature rise test EN 60044-2 (8.1)
Lightning impulse test EN 60044-2 (8.3.2)
Switching impulse test EN 60044-2 (8.3.3/14.4.4)
Wet test for outdoor type transformers EN 60044-2
(8.4/14.4.4))
Determinations of errors of the testsample
EO-20.2 (3.2.1)PTB-A 20.2 (4)PTB-Testing Instructions (3.5)
Routine tests:
Verifications of terminal markings EN 60044-2 (9.1)
Power-frequency withstand tests onprimary winding
EN 60044-2 (9.2)
Partial discharge measurement EN 60044-2 (9.2.4)
Power-frequency withstand tests onsecondary winding
EN 60044-2 (9.3)
Power-frequency withstand testsbetween sections EN 60044-2
(9.3)
Determinations of errors of the testsample
EO-20.2 (3.2.1)PTB-A 20.2 (4)PTB-Testing Instructions (3.5)
Physikalisch -Techn ische Bundesanstalt, Bundesallee 100 D-38116
Braunschweig, vers. 2008-08-05. Allrights r eserved, No part may be
reproduced without the prior wri tten permission o f PTB
