IEC 60044-3:2002 pdf download

IEC 60044-3:2002 pdf download.Instrument transformers – Part 3: Combined transformers.
Special test
A test other than a type or a routine test, agreed on by manufacturer and purchaser.
6.2 Type tests
The following tests are type tests: for details, reference should be made to the relevant subclauses
a) short-time current test on current transformers (see 7.1 of IEC 60044-1):
b) temperature-rise test (see 7.2):
C) lighting impulse test (see 7.3 and also 7.3.2 of IEC 60044-1 for current transformers and 8.3.2 of IEC 60044-2 for voltage transformers);
d) switching impulse test (see 7.3 and see also 7.3.3 of IEC 60044-1 for current transformers and 8.3.3 of IEC 60044-2 for voltage transformers);
e) wet test for outdoor transformers (see 7.4 of IEC 60044-1 for current transformers and 8.4 of IEC 60044-2 for voltage transformers);
f) short-circuit withstand capability test on voltage transformers (see 8.2 of IEC 60044-2):
g) determination of errors (see Clause 11):
h) measurement of the radio interference voltage (RIV) (see 8,5 of IEC 60044-2).
All the dielectric type tests shall be carried out on the same transformer, unless otherwise specified.
After the transformer has been subjected to the dielectric type test of this subclause. It shall be subjected to all the routine tests of 6.3,
6.3 RoutIne t.sts
The following tests apply to each individual transformer:
a) verification of terminal marking (see 8.1 of IEC 60044-1 for current transformers and 9.1 of IEC 60044-2 for voltage transformers);
b) power-frequency withstand test on the primary winding (See 8,2 and see also 8.2 of IEC 60044-1 for current transformers and 9.2 of ICC 60044-2 for voltage transformers):
c) partial discharge measurement for voltage transformers (see 9.2.4 of ICC 60044-2);
d) power-frequency withstand test on secondary windings (see 8.3 of IEC 60044-1 for current transformers and 9.3 of IEC 60044.2 for voltage transformers):
e) power-frequency withstand test between sections (see 8.3 of IEC 60044-1 for current transformers and 9.3 of IEC 60044-2 for voltage transformers);
f) inter-turn overvoltage test for current transformers (see 8.4 of IEC 60044-1):
g) determination of errors (See 11.4).
The order of the tests is not standardized but the determination of errors shall be performed after each test.
Repeated power-frequency tests on primary windings should be performed at 80 % of the specified test voltage.
6.4 SpecIal tests
The following tests shall be performed upon agreement between manufacturer and purchaser:
a) chopped impulse test on the primary winding (see 7.3 and also 9.1 of IEC 60044-1 for current transformers and 10,1 of IEC 60044-2 for voltage transformers):
b) measurement of capacitance and dielectric dissipation factor (see 9.2 and also 9.2 of IEC 60044.1 for current transformers and 10.2 of IEC 60044.2 for voltage transformers):
C) multiple chopped Impulse tests on the primary winding for current transformers (see 7.3 and also annex B of IEC 60044.1):
d) mechanical test for voltage transformers (see 10.3 of IEC 60044-2):
e) transmitted overvoltage measurement (see 9.3).
7 Type tests
7.1 General
For the purposes of this part of IEC 60044, Clause 7 of IEC 60044-1 and Clau5e 8 of IEC 60044-2 apply to the current and voltage transformer respectively, unless otherwise specified below.
7.2 Temperature-rIse test
A test shall be made in order to prove compliance with 4.2. For the purpose of this test. combined instrument transformers shall be considered to have attained a steady-state temperature when the rate of temperature rise does not exceed 1 K/h, The ambient temperature may be between 10 C and 30 C.
When there is more than one secondary winding, the tests shall be made with the appropriate rated burden connected to each secondary winding unless otherwise agreed between manufacturer and user. For the test, the transformer shall be mounted in a manner representative of the mounting in service. The prescribed current and voltage are applied simultaneously to the combined instrument transformer For this purpose, it is necessary that the primary winding and the secondary winding of the transformer generating the high current which excites the current transformers are insulated in relation to one another for the full voltage of the network.
If such a transformer is not available, two other test arrangements are recommended.