voltage sag testing

3.  Voltage dips
 Short interruption
 Voltage variation
 Interruption, voltage dips and voltage
variation causes
 Test level and preferred test level
 Test procedure
 2 types test configuration
 Summary

4.  The immunity test method and range of test
level applies to electrical/electronic
equipment which:
Irated ≤ 16A/phase for connection to
50Hz/60Hz ac network

5. VOLTAGE SHORT
DIPS/SAG INTERRUPTION
TEST &
MEASURE
VOLTAGE
VARIATION

6.  Sudden reduction in voltage below specified dip
threshold
 short period of time, follow by recovery to the
original voltage

8.  Decreased below specified interruption threshold
 Consider as voltage dip to zero.
 Usually not more then 1 minute
 Followed by recovery to original voltage

10.  Change in voltage continuously

11.  Continuously varying load connecting to
network

12.  Short circuit (eg. SLG)
 Sudden large change of load

14.  For equipment that has Vrated range; if the
voltage range do not exceed 20% of the lower
Vrated, a single voltage may be specified as
test level UT

15.  Class 1 – compatibility level < public network level
◦ Sensitive disturbance to ps (ups necessary)
 Class 2 - compatibility level = public network level
 Class 3 - compatibility level > public network level
◦ Large motor frequently start
◦ Welding machines are present
◦ Major part of the load is fed trough converter
◦ Load vary rapidly

17.  changes in THE Recommended
supply voltage
shall occur at TEST to use 0º for 1
zero crossing of the phases
 Addition angel
selected from SHORT
45º, 90º, INTERRUPTION
180º,225º,270º
and 315º if
necessary.
DIPS 3 phase
Single
phase
3 phase  For 3 phase
Single
phase short
interruption,
 Test 1 by 1 it shall be
phase tested
simultaneou
sly

20.  Output voltage of generator at no
load:
 80% of nominal value verified in
maximum duration of 5s
 70% and 40% of nominal value
verified in maximum duration of 3s
 Power source within ±2% of frated
 Shortest ps cable as specified by EUT
manufacturer

21. PRE- TEST
PLANNING
ANALYSIS
Define which EUT FULL
•EUT designation system FUNCTION
•Possible configuration CHECK
connections (eg: (next slide) to
plug, terminal etc) be tested to
•Input power port reproduce field
•EUT operation situation
representative RESULT/
•EUT Technical TEST
Test report & Any
specification REPORT/
degradation also
•Setup description
record RECORD

22.  Are classified into 4 categories:

23. 2 TYPES TEST
CONFIGURATION
IMMUNITY TEST
GENERATOR
USING VARIABLE
TRANSFORMER
COMBINATION
OF
TRANSFORMER
TAP

29. 2 TYPES TEST
CONFIGURATION
VOLTAGE IMMUNITY TEST
DIPS/SAG GENERATOR
USING VARIABLE
TRANSFORMER
TEST & SHORT
MEASURE INTERRUPTION COMBINATION
OF
TRANSFORMER
TAP
VOLTAGE
VARIATION