This document discusses testing the immunity of electrical equipment to power quality disturbances. It describes different types of disturbances like voltage dips, short interruptions, and variations. It outlines two test configurations using a variable transformer or combination of transformer taps to generate the disturbances. Test procedures are specified along with preferred test levels and how to classify equipment based on its compatibility with different levels of disturbances on the power network.

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