METREL MI 3399, Instruction Manual With Exercises

Page: 163 / 272

Power and Voltage Quality Trainer AD 2
– MI 3399
163
4.4 Exercise 4
– Voltage Interrupts
In this exercise, we will show how the instrument should be setup in order to capture
and observe a voltage interrupt. Voltage interrupt is a large reduction of the voltage
magnitude on all phases, at a point in the electrical system below given limit. Actually,
an interrupt is a special case of a voltage dip. Before start, please set the switch S3 in
the Application Trainer to ON as shown in the table below. The remaining switches
should be set to OFF.
Switch Description State
S3 Interrupt
ON
The Application Trainer will simulate an electrical system with the following
parameters:

Fundamental voltage: 230V

Fundamental current: 1000A

Load type: Inductive

Load character: Load (Consumption of electrical power)

Frequency: 50/60 Hz

Voltage interrupt, 5 periods long voltage interrupt is present on all phases. The
interrupt is repeated every 10 seconds.
4.4.1 Instrument setup for Interrupt capturing
The Power Master MI 2892 should be connected to the Application Trainer and set up
as described in section 3.2 Instrument Setup. It is good practice to observe the
Connection Check status in the MEASRUEMENT SETUP

CONNECTION SETUP
menu. If it is marked with an OK sign ( ), you can start observing measurements.
For observing voltage interrupts, it is necessary to set up an interrupt threshold voltage.
If the voltage on all phases falls below the threshold, the voltage interrupt will be
recorded. Limits are set up in the MEASRUEMENT SETUP

EVENT SETUP menu
as shown in the figures below.
Figure 4-32: Interrupt threshold setup
Parameters need to be set:

Swell: 110% - this event will be detected, if an increase of more than 10% of the
nominal voltage occurs on the input channel,Dip: 90% - this event will be