Iskra MT440 - 2.4 Purpose and use of measuring transducer

Basicdescriptionandoperationofmeasuringtransducer
8 User’sManual
2.4 Purpose and use of measuring transducer
The instrument is used for monitoring and measuring electric quantities of three-phase electrical
power distribution system. The meter is provided with 32 program adjustable alarms, up to four
different modules and communication. With the RS232/RS485 and USB communication, the
meter can be set and measurements can be checked. The meter also functions as an energy
counter (up to four energy counters), with the additional function of cost management by tariffs.
Supported measurements
Basic measurements
Phase
Voltage U
1
, U
2
, U
3
and U
~
Current I
1
, I
2
, I
3
, I
n
, I
t
and I
a
Active power P
1
, P
2
, P
3
, and P
t
Reactive power Q
1
, Q
2
, Q
3
, and Q
t
Apparent power S
1
, S
2
, S
3
, and S
t
Power factor PF
1
, PF
2
, PF
3
and PF
~
Power angle φ
1
, φ
2
, φ
3
and φ
~
THD of phase voltage U
f1
, U
f2
and U
f3
THD of power angle I
1
, I
2
and I
3
Phase-to-phase
Phase-to-phase voltage U
12
, U
23
, U
31
Average phase-to-phase voltage U
f
f
Phase-to-phase angle φ
12
, φ
23
, φ
31
THD of phase−to−phase voltage
Energy
Counter 1
Counter 2
Counter 3
Counter 4
Active tariff
Other measurements
MD values
Phase current I
1
, I
2
, I
3
Active power P (Positive)
Active power P (Negative)
Reactive power Q − L
Reactive power Q − C
Apparent power S
Other measurements
Measurements
Frequency
Internal temperature