Measurements; Definition; Sampling; Sampling Period - AEMC PEL 102 User Manual

A.1 Measurements
A.1.1 Definition
Calculations are done according to IEC 61557-12 and IEC 61010-4-30.
Geometric representation of active and reactive power:
Diagram in accordance with clauses 12 and 14 of IEC 60375.
Reference of this diagram is the current vector (fixed on right-hand line).
The voltage vector V varies its direction according to the phase angle ϕ.
The phase angle ϕ between voltage V and current I is taken to be positive in the mathematical sense (counter-clockwise).
A.1.2 Sampling
A.1.2.1 Sampling Period
Depends on main frequency: 50Hz, 60Hz or 400Hz
Sampling period is calculated every second
■
Main frequency f = 50Hz
- Inside 42.5 to 57.5Hz (50Hz ±15%), sampling period is locked to main frequency.
128 samples are available for each main cycle.
-
Outside 42.5 to 57.5Hz, sampling period is 128*50Hz.
■
Main frequency f = 60Hz
-
Inside 51 to 69Hz (60Hz ±15%), sampling period is locked to main frequency.
128 samples are available for each main cycle.
-
Outside 51 to 69Hz, sampling period is 128*60Hz.
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APPENDIX A

Source
Export active power
2
CAP
Import
reactive
power
Export
reactive
IND
power
3
Source
Figure 70
Q
Load
Import active power
1
IND
S
Q
φ
P
P
CAP
4
Load
Power & Energy Logger Model PEL 102 and PEL 103