Short Interruption Dip Tests IEC62052-11

The International Electrotechnical Commission (IEC) has released the edition 2 of the IEC62052-11. Release date was 29.06.2020. This edition includes several significant technical changes with respect to the previous edition.

Today we take a closer look at the chapter 9.3.2

Voltage dips and short interruptions

The intent of these tests is to ensure that the meter is immune to dipsWhat is a Voltage Dip Event? and short interruptions that commonly occur on the mains power supply.

The IEC standard provides only a table. To make the requirements more easy to understand, we have converted the table in qualitative graphics. These graphics are showing the number of cycles for AC meters with a nominal frequency of 50 Hz. For the 60 Hz values please take a look at table 16 of the IEC62052-11:2020.

General Conditions
The voltage circuits are energized with their lowest specified nominal voltage and without current.
Additionally, for three-phase meters:
The voltage interruption tests (test 1 … 4) have to be done at the same time for all three phases. The voltage dip tests (test 5 … 9) are done phase by phase (Ph – N). The other phases remain connected to the supply voltage U_n.
For three-phase three wire meters the phase-phase voltages are tested. The other phases remain connected to the supply voltage.

Voltage Interruption, Test 1

Voltage Interruption, Test 2

Voltage Interruption, Test 3

Voltage Interruption, Test 4

Voltage Dip, Test 5

Voltage Dip, Test 6

Voltage Dip, Test 7

Voltage Dip, Test 8

Voltage Dip, Test 9

Acceptance Criteria

Simplified
During the test, a temporary degradation or loss of primary functions is acceptable.
Items to monitor for evaluation:

• Energy registration
  You read the billing registers before and after each test
  The register values are not allowed to change above the critical change valueThe Critical Change Value (x)
  x = 10⁻⁶ × m × U_n × I_max
  x = critical change value in kWh or kvarh
  m = number of measurement elementsThe different current subscripts
  U_n = nominal voltage (V)
  I_max = maximum current (A)
• Indicating display
  degradation of display quality during the test is acceptable
• Load switchWhat is a Load-Switch?
  unexpected operation of the switch during the test shall not occur

Thank you for reading. You can leave a comment after the dip.