Energy Meter Manual

A-2
IM 77C01E01-01E
Appendix 1 Specifications of PR300
*: The setting of the voltage range can be changed.
**: The primary voltage of VT.
Power Items and Equations
Phase and wire system
Single-phase two-wire
system
Single-phase three-wire
system
Three-phase three-wire
system
Three-phase four-wire
system
Three-phase four-wire
system (2.5 element)
Apparent Power
VA = V×A
VAi = Vi×Ai
i = 1, 2 ΣVA = VA1+VA2
VAi = Vi×Ai
i = 1, 3 ΣVA = 3/2(VA1+VA3)
VAi = Vi×Ai
i = 1, 2, 3 ΣVA = VA1+VA2+VA3
VAi = Vi×Ai
i = 1, 3 ΣVA = 3/2(VA1+VA3)
Reactive Power
(without using reactive power meter method)
Q = ((VA)
2
−P
2
)
Qi = ((VAi)
2
−Pi
2
)
i= 1, 2 ΣQ=Q1+Q2
Qi = ((VAi)
2
−Pi
2
)
i=1, 3 ΣQ=Q1+Q3
Qi = ((VAi)
2
−Pi
2
)
i=1, 2, 3 ΣQ=Q1+Q2+Q3
Qi= (
3/2
(VAi)
2
−Pi
2
)
i=1, 3 ΣQ=Q1+Q3
Power Factor
ΣP/ΣVA
(without using reactive
power meter method)
(V and A are rms values.)
* For distorted wave input, there may be differences between the PR300 and a measuring instrument that uses a different measurement principle.
Input Specifications
Phase and wire system
Universal three-phase three-wire system (switch the setting from single-phase two-wire system,
single-phase three-wire system, or three-phase three-wire system)
Universal three-phase four-wire system (switch the setting from single-phase two-wire system,
single-phase three-wire system, three-phase three-wire system, or three-phase four-wire system)
Three-phase four-wire system (2.5 element)
Frequency 45 to 65Hz
Rated input voltage 120 V; voltage range: 150 V
(*)
: 900kV
(**)
240 V; voltage range: 300 V
(*)
: 1800kV
(**)
480 V; voltage range: 600 V
(*)
: 3600kV
(**)
Allowable input voltage Within the voltage range
Rated input current 1 A; current range: 1 A (fixed): 32kA
(***)
5 A; current range: 5 A (fixed): 160kA
(***)
Allowable input current 1.2 times the current range (continuous); twice the current range (10 seconds); 10 times the
current range (3 seconds)
Rated input power and measuring range (when VT and CT are used, their respective secondary values)
Input
(AC)
120V/1A
120V/5A
240V/1A
240V/5A
480V/1A
480V/5A
Rated power
100W
500W
200W
1000W
400W
2000W
Input
measuring
range
–120 to 120W
–600 to 600W
–240 to 240W
–1200 to 1200W
–480 to 480W
–2400 to 2400W
Approximate consumed VA
Voltage
0.2VA
0.4VA
0.8VA
Current
0.2VA
Input
(AC)
120V/1A
120V/5A
240V/1A
240V/5A
480V/1A
480V/5A
Rated power
200W
1000W
400W
2000W
800W
4000W
Input
measuring
range
–240 to 240W
–1200 to 1200W
–480 to 480W
–2400 to 2400W
–960 to 960W
–4800 to 4800W
Approximate consumed VA
Voltage
0.2VA/
phase
0.4VA/
phase
0.8VA/
phase
Current
0.2VA/
phase
Input
(AC)
120V/1A
120V/5A
240V/1A
240V/5A
480V/1A
480V/5A
Rated power
300W
1500W
600W
3000W
1200W
6000W
Input
measuring
range
–360 to 360W
–1800 to 1800W
–720 to 720W
–3600 to 3600W
–1440 to 1440W
–7200 to 7200W
Approximate consumed VA
Voltage
0.2VA/
phase
0.4VA/
phase
0.8VA/
phase
Current
0.2VA/
phase
Input
(AC)
240V/1A
240V/5A
Rated power
200W
1000W
Input
measuring
range
–240 to 240W
–1200 to 1200W
Approximate consumed VA
Voltage
0.2VA/
phase
Current
0.2VA/
phase
Single-phase two-wire system Single-phase three-wire system
Three-phase three-wire system Three-phase four-wire system
*
*
*
*
Input specification of 1A AC is not available for 2.5 element.
When VT and CT are used, the input measuring range of the primary input power is smaller
than 10 GW, and the value calculated by the following equation is within the input measuring
range above.
Input measuring range (W) =
Primary input power (W)
VT ratio  CT ratio
***: The primary current of CT.