GB 1094.11-2007 English PDF (GB1094.11-2007)

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GB 1094.11-2007: [GB/T 1094.11-2007] Power transformers. Part 11: Dry-type transformers
GB 1094.11-2007 (Renamed to GB/T 1094.11-2007)
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.180
K 41
GB 1094.11-2007
Replacing GB 6450-1986
Power transformers - Part 11: Dry-type transformers
(IEC 60076-11:2004, MOD)
ISSUED ON: APRIL 30, 2007
IMPLEMENTED ON: APRIL 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
This standard is changed into recommended
standard, from March 23, 2017. Its number is
changed to GB/T 1094.11-2007
Table of Contents
Foreword ... 6 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 10 
4 Operating conditions ... 11 
4.1 Overview ... 11 
4.2 Normal conditions of use ... 11 
4.3 Electromagnetic compatibility (EMC) ... 12 
4.4 Special conditions of use ... 12 
4.5 Transportation and storage conditions ... 13 
5 Taps ... 14 
6 Binding group ... 14 
7 Capability to withstand short circuits ... 14 
8 Rated value ... 14 
8.1 Overview ... 14 
8.2 Rated capacity ... 14 
8.3 Priority value of rated capacity ... 15 
8.4 Operation above rated voltage ... 15 
8.5 Operation during fan cooling ... 15 
8.6 Operation in the enclosure ... 15 
9 Nameplate... 16 
9.1 Nameplate fixed on the transformer ... 16 
9.2 Nameplate fixed on the transformer enclosure ... 17 
10 Signs of cooling method ... 17 
10.1 Code of signs ... 17 
10.2 Arrangement of letter codes ... 17 
11 Limit of temperature rise ... 18 
11.1 Limit of normal temperature rise ... 18 
11.2 Reduced temperature rise of transformers designed for higher cooling air
temperature or special air cooling conditions ... 19 
11.3 Correction of temperature rise at high altitude ... 19 
12 Insulation level ... 20 
12.1 Overview ... 20 
12.2 Transformers used at high altitudes ... 20 
13 Climate, environment and combustion performance class ... 21 
13.1 Climate class ... 21 
13.2 Environmental class ... 21 
13.3 Combustion performance class ... 22 
13.4 Test criteria for climatic, environmental, combustion performance class ... 22 
14 General requirements for testing ... 23 
15 Measurement of winding resistance (routine test) ... 23 
16 Measurement of voltage ratio and verification of binding group number
(routine test) ... 23 
17 Measurement of short-circuit impedance and load loss (routine test) ... 23 
18 Measurement of no-load loss and no-load current (routine test) ... 24 
19 Applied withstand voltage test (routine test) ... 24 
20 Induction withstand voltage test (routine test) ... 24 
21 Lightning impulse test (type test) ... 24 
22 Measurement of partial discharge (routine test and special test) ... 25 
22.1 Overview ... 25 
22.2 Basic measurement circuit (only typical circuit) ... 25 
22.3 Calibration of measuring circuit ... 26 
22.4 Voltage application method ... 27 
22.5 Acceptance level of partial discharge ... 28 
23 Test of temperature rise (type test) ... 28 
23.1 Overview ... 28 
23.2 Method of applying load ... 28 
23.3 Correction of winding's temperature rise under reduced current ... 32 
23.4 Determination of steady-state conditions ... 32 
24 Measurement of sound level (special test) ... 33 
25 Short-circuit withstand capability test (special test) ... 33 
26 Environmental test (special test) ... 33 
26.1 Overview ... 33 
26.2 Validity of test ... 33 
26.3 Test procedure ... 33 
27 Climatic test (special test) ... 35 
27.1 Overview ... 35 
27.2 Validity of test ... 35 
27.3 Climatic test (thermal shock test) for grade C1 transformers ... 36 
27.4 Climatic test (thermal shock test) of grade C2 transformer ... 38 
28 Combustion performance test (special test) ... 38 
28.1 Overview ... 38 
28.2 Detection of corrosive and harmful gas escape ... 38 
28.3 Combustion performance test of grade F1 transformer ... 39 
28.4 Parameters to be measured and measuring devices ... 43 
28.5 Calibration of the test chamber without the sample ... 44 
28.6 Test method ... 44 
28.7 Test report ... 45 
28.8 Evaluation criteria for test results ... 45 
29 Deviation ... 46 
30 Protection against direct contact ... 46 
31 Degree of protection of enclosure ... 46 
32 Grounding terminal ... 46 
33 Information needed for inquiries and orders ... 47 
34 Information on installation and safety ... 47 
Appendix A (Informative) Comparison of the number of chapters, clauses,
tables between this part and IEC 60076-11:2004 ... 48 
Appendix B (Informative) Technical differences between this part and IEC
60076-11:2004 and their reasons ... 49 
Appendix C (Informative) Insulation level of North America in IEC 60076-
11:2004 ... 51 
Appendix D (Informative) Installation and safety of dry-type transformers ... 52 
Foreword
Chapter 1, Chapter 2, Chapter 3, Chapter 6, Chapter 33, Chapter 34 of this
part are recommended. The rest are mandatory.
GB 1094 "Power transformers" currently contains the following parts:
- Part 1: General;
-Part 2: Temperature rise;
- Part 3: Insulation levels, dielectric tests and external clearances in air;
- Part 4: Guide to the lightning impulse and switching impulse testing - Power
transformers and reactors;
- Part 5: Ability to withstand short circuit;
- Part 10: Determination of sound;
- Part 11: Dry-type transformers.
This part is Part 11 of GB 1094. The number of the previous version of this part
is GB 6450. The corresponding IEC standard number is IEC 60726. As the
standard numbers of IEC related power transformers are now adjusted to the
IEC 60076 series, in order to be in harmony with the IEC standard numbers
AND convenient to use, this revision also adjusts the standard numbers, based
on the new IEC standard series.
This part modifies and adopts IEC 60076-11:2004 "Power transformer - Part 11:
Dry-type transformer" (English version).
This part is redrafted in accordance with IEC 60076-11:2004 in accordance with
the redrafting principles. The numbering of the figure in this part is completely
consistent with IEC 60076-11:2004, whilst the numbering of some chapters,
clauses, tables are not completely consistent with IEC 60076-11:2004. The
comparison list is given in Appendix A.
Taking into account the current conditions of China, when adopting IEC 60076-
11:2004, some technical content has been modified in this part. The differences
have been incorporated into the main text AND marked with a vertical single
line in the margins of the clauses they involve. A list of these technical
differences and their reasons is given in Appendix B, for reference.
For ease of use, this part also makes the following editorial changes to IEC
60076-11:2004:
a) DELETE the forewords of IEC 60076-11:2004;
b) USE a decimal point ".", to replace the comma "," which was used as a
decimal point;
c) According to GB/T 1.1-2000 "Directives for standardization-Part 1: Rules
for the structure and drafting of standards", MODIFY the format of Table 1
in IEC 60076-11:2004.
This part replaces GB 6450-1986 "Dry-type power transformer".
Compared with GB 6450-1986, the main changes in this part are as follows:
- ADD the "Normative references";
- CANCEL the definitions of "dry-type transformers with encapsulated coils",
"dry-type transformers with non-encapsulated coils", "sealed dry-type
transformers";
- ADD some "conditions of us...