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DESCRIPTION
voltage sag testing
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IEC 61000 -4-11
TESTING & MEASURING TECHNIQUES
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
CONTENT
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
IEC 61000 -4-11
TEST & MEASURE
VOLTAGE DIPS/SAG
SHORT INTERRUPTION
VOLTAGE VARIATION
Sudden reduction in voltage below specified dip threshold
short period of time, follow by recovery to the original voltage
VOLTAGE DIPS/SAG
Decreased below specified interruption threshold Consider as voltage dip to zero. Usually not more then 1 minute Followed by recovery to original voltage
SHORT INTERRUPTION
Change in voltage continuouslyVOLTAGE VARIATION
Continuously varying load connecting to network
CAUSES OF VOLTAGE VARIATION
Short circuit (eg. SLG) Sudden large change of load
CAUSES OF DIP & INTERRUPTION
CASE EXAMPLE
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
TEST LEVEL
CONSIDER ANNEX B (CLASSES) & TABLE BEFORE TESTING
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
For 3 phase short interruption, it shall be tested simultaneously
DIPS
SHORT INTERRUPTIO
N
Single phase
3 phase
Single phase
3 phase
changes in supply voltage shall occur at zero crossing
Addition angel selected from 45º, 90º, 180º,225º,270º and 315º if necessary.
Test 1 by 1 phase
Recommended to use 0º for 1 of the phases
THE TEST
ADDITIONAL ANGEL OR PHASE SHIFT
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
TEST PROCEDURE (before testing) VERIFICATION GENERATOR
TEST PROCEDURE
PLANNING PRE-ANALYSIS
TEST
•EUT designation•Possible connections (eg: plug, terminal etc)•Input power port•EUT operation representative•EUT Technical specification•Setup description
Define which system configuration (next slide) to be tested to reproduce field situation RESULT/
TEST REPORT/RECORD
EUT FULL FUNCTION
CHECK
Test report & Any degradation also record
Are classified into 4 categories:
RESULT OF IMMUNITY TESTS:
2 TYPES TEST CONFIGURATION
COMBINATION OF
TRANSFORMER TAP
IMMUNITY TEST GENERATOR
USING VARIABLE TRANSFORMER
IMMUNITY TEST GENERATOR USING VARIABLE TRANSFORMER
IMMUNITY TEST USING TAPPER TRANSFORMER
TIMING OF CONTROL SIGNAL
tp1 = signal from MPU at wrong time
tp2 = signal from MPU at right time
TEST & MEASUR
E
VOLTAGE DIPS/SAG
SHORT INTERRUPTION
VOLTAGE VARIATION
SUMMARYIEC 61000-4-11
2 TYPES TEST CONFIGURATION
COMBINATION OF
TRANSFORMER TAP
IMMUNITY TEST GENERATOR
USING VARIABLE TRANSFORMER
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