2.11 Methods of presenting test results
A report of the impulse tests conducted on equipment can be very useful to
A report of the impulse tests conducted on equipment can be very useful to the purchaserthe purchaser. It provides the pur-. It provides the pur-chaser with a permanent record of the tests performed. If the purpur-chaser does not witness the factory tests, the chaser with a permanent record of the tests performed. If the purchaser does not witness the factory tests, the report provides the source
report provides the source of information regarding the tests of information regarding the tests performed. Wperformed. Well prepared reports can ell prepared reports can be usefulbe useful to the purchaser in educating inspectors or
to the purchaser in educating inspectors or others who witness factory tests.others who witness factory tests.
Figure 20ÑCurrents Figure 20ÑCurrents
Figure 21ÑVolta
Figure 21ÑVoltages and ges and currentscurrents
T
To be useful to o be useful to the purchaser the test results should include the the purchaser the test results should include the following minimum data:following minimum data:
a)
a) GenerGeneral infal informaormation, ttion, that is, that is, type and rype and ratinating of equig of equipment pment testetested, serid, serial numbal numberer, date of t, date of test, wiest, wit- t-nesses to the test, etc. See the suggested form in Þgure 33.
nesses to the test, etc. See the suggested form in Þgure 33.
b)
b) A tabuA tabulatilation shoon showing imwing impulse tpulse tests coests conductnducted on each ted on each termierminal incnal includiluding type anng type and magnid magnitude of ttude of testest waves. The connection of untested terminals of all windings should be
waves. The connection of untested terminals of all windings should be described as outlined in Þgure described as outlined in Þgure 33.33.
c)
c) ReproReproductiductions of thons of the pertie pertinent renent recordicordings takngs taken durien during the teng the tests arsts are an impe an importanortant part of t part of the testhe testt report. When speciÞed, these recordings should be properly identiÞed and arranged so that the report. When speciÞed, these recordings should be properly identiÞed and arranged so that the nec-essary comparisons between full waves, chopped waves, and front-of-wave can be easily made.
essary comparisons between full waves, chopped waves, and front-of-wave can be easily made.
Copies of recordings taken on 35 mm Þlm should be enlarged to a size that permits direct visual Copies of recordings taken on 35 mm Þlm should be enlarged to a size that permits direct visual inspection.
inspection.
Figure 22ÑVolta
Figure 22ÑVoltages and ges and currentscurrents
Figure 23ÑVolta
Figure 23ÑVoltages and ges and currentscurrents
d)
d) It is preIt is preferreferred that thd that the recore recordings odings of wavf waves to be comes to be comparepared be overd be overlaid. laid. A less desA less desirablirable altee alternatirnative isve is to reproduce the recorded Þlms of
to reproduce the recorded Þlms of waves to be compared as closely together waves to be compared as closely together as possible in a as possible in a verticalvertical array.
array.
Figure 24ÑVolta
Figure 24ÑVoltages and ges and currentscurrents
Figure 25ÑCurrents Figure 25ÑCurrents
Figure 26ÑFront-of-wave Figure 26ÑFront-of-wave
e)
e) TimTiming waing waves or tves or timiniming pips mag pips may be on each ry be on each recordecording so pling so placed taced that the that the test waest wave is nove is not obsct obscured.ured.
Acceptable substitutes would be to mark the time
Acceptable substitutes would be to mark the time scale on the recordings.scale on the recordings.
f)
f) RecorRecordings dings to demto demonstronstrate thate that the at the transtransformformer has er has succesuccessfulssfully witly withstoohstood all td all the requhe required iired impulsmpulsee tests generally are included in
tests generally are included in the Þnal test report. Where the Þnal test report. Where the manufacturer has conducted additionalthe manufacturer has conducted additional tests to explain discrepancies, etc., the pertinent recordings also should be
tests to explain discrepancies, etc., the pertinent recordings also should be included in the report.included in the report.
Figure 27ÑVolta
Figure 27ÑVoltages and ges and currentscurrents
Figure 29ÑVolta
Figure 29ÑVoltages and ges and currentscurrents
Figure 30ÑVolta
Figure 30ÑVoltages and ges and currentscurrents
Figure 31ÑVolta
Figure 31ÑVoltages and ges and currentscurrents
Figure 32ÑVolta
Figure 32ÑVoltages and ges and currentscurrents
Name of
Name of Manufacturer ___________________________________________Manufacturer _________________________________________________________________________________________
Purchaser_____________________________________________________________________________
Purchaser_____________________________________________________________________________
Date of
Date of TesTest___________________ PurchaserÕt___________________ PurchaserÕs Order s Order No. ______________ No. ______________ MfrÕMfrÕs Ref.______________s Ref.______________
Serial
Serial Number(s) Number(s) ______________________________________________________________________________________________________________________________________________
H wi
H windndining __g ___________________ k_ kVVA A WWinindiding _ng ______________________ k_ kVVAA Y wY winindiding ng ______________________ __ kVkVAA ___________V
___________V ____________ ____________ V V ____________ V____________ V ___________
___________ BIL BIL ____________ BIL ____________ BIL ____________ ____________ BILBIL
NOTEÑAdditional sheets need only repeat this table plus purchaser
NOTEÑAdditional sheets need only repeat this table plus purchaser Õs order number and manufacturerÕs reference number.Õs order number and manufacturerÕs reference number.
Tes
Test witnessed t witnessed by_____________________________________by___________________________________________ Date ______ Date ______________________________________________
I hereby certify that this is a
I hereby certify that this is a true report based on factory test made in true report based on factory test made in accordance with IEEE Std C57.12.00-1993.accordance with IEEE Std C57.12.00-1993.
Signed _________________________________ Date
Signed _________________________________ Date _______________ Approved ________________________________ Approved _________________
Terminal
aaReduced full-wave voltage (RWF), reduced full-wave current (RFWC), full-wave voltage (FW), full-wave currentReduced full-wave voltage (RWF), reduced full-wave current (RFWC), full-wave voltage (FW), full-wave current (FWC) chopped-wave voltage (CW), and front-of-wave voltage (FOW).
(FWC) chopped-wave voltage (CW), and front-of-wave voltage (FOW).
b
bTerminals grounded (GRD), terminals connected to arresters (ARR), and terminals connected to ground throughTerminals grounded (GRD), terminals connected to arresters (ARR), and terminals connected to ground through linear resistance (RES).
linear resistance (RES).
Figure 33ÑTransf
Figure 33ÑTransformer lightning impulse ormer lightning impulse test reporttest report