Kyoritsu Electrical Instruments Works KEW 2062, Инструкция по эксплуатации

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Power function KEW 2062/2062BT
- 43 - KEW 2062/2062BT
Power function
Active power (P) [W]
Range
40.00kW/400.0 kW/1000 kW
* Switched according to the selected current range.
Display digit
4-digit
(The LCD shows ”----” if the reading is out of the guaranteed accuracy range.)
Sampling period 1 cycle/ 500ms
Sampling frequency 32.8 kHz(30.5 μs interval)
Effective input range Effective input range of RMS voltage, and RMS current and within the
frequency range of 45 to 65 Hz.
Display range 40.00kW range : 0.00 to 44.00 kW
400.0kW range : 0.0 (36.0 kW) to 440.0 kW
1000kW range : 0 (360 kW) to 1210 kW
* Currently selected range is fixed if you select MAX, MIN, or AVG in
display mode.
* Values within parenthesis will be displayed while auto-ranging function
is activated, and “---” will be displayed when readings are out of the
display range of RMS voltage or RMS current and effective input
frequency.
Accuracy
For sine wave with power factor 1 : ±1.7%rdg±5dgt
influence of phase angle within ±3.0°
where: within the effective input range for ACV and ACA
functions, PF: 1, sine wave, and 45 – 65 Hz)
* Sum value: Total errors determined by each measurement channels.
(doubled: 3P3W, tripled: 3P4W)
Polarity sign
Consumption (flow-in): no sign, Regeneration(flow-out): -
Formula
P=
1
n
��
( V
i
×A
i
)
n-1
i=0
�
V is used as reference,
i : Sampling point No.
n : Number of samples/ cycle
Wiring system
Display value Destination
1P2W ･ 1P3W
P
1P2W:L=V1
･
A ,N=V3
1P3W: L1/L2=V1
･
A, N=V3
Balance 3P3W Psum(=Ssum×cos(θ)) R=V1 ･ A, S=V3
Balance 3P4W Psum(=P×3) R=V1
･
A, N=V3
Unbalance 3P3W
P1 ､ P2 ､ Psum(=P1+P2)
P1 :R=V1 ･ A, S=V2, T=V3
P2 :R=V1 ,S=V2, T=V3 ･ A
* Change the connected points twice
and test (2-wattmeter method)
Unbalance 3P4W
Displayed only when measureding
each phase: P1, P2, P3
Total value: Psum(=P1+P2+P3)
P1: R=V1 ･ A, N=V3
P2: S=V1 ･ A, N=V3
P3: T=V1 ･ A, N=V3
* Change the connected points three
times and test
KEW 2062/2062BT Apparent power (S) [VA]
KEW 2062/2062BT - 44 -
Apparent power (S) [VA]
Range Same as the active power
Display digit Same as the active power
Effective input range Same as the active power
Accuracy ±1dgt to the result determined by each measured value
* Sum: add errors of each channel, 3P3W: ±2dgt, 3P4W: ±3dgt
Polarity sign No sign
Formula
S=V×A
*
When P >S, P=S.
Wiring system Display value Destination
1P2W
･
1P3W S Same as the active power
3P3W (balance)
S
sum
(
＝
S×
√
3)
3P4W (balance)
S
sum
(
＝
S×3)
3P4W (unbalance)
S
sum
(
=S
1
+S
2
+S
3
)
※ S
n
: Apparent power at the
nth measurement
Reactive power (Q) [Var]
Range Same as the active power
Display digit Same as the active power
Effective input range Same as the active power
Accuracy ±1dgt to the result determined by each measured value
* ±2dgt when measuring balance 3P3W, ±3dgt when measuring balance
3P4W
Polarity sign Phase delay: no sign, Phase advance: -
Formula
Q= √ S 2 − P 2
*
Where P >S, P=S.
* Q=0 when ꞁ P ꞁ >S.
* Polarity symbol is displayed depending on the current phase angle
with the voltage phase (0°) as reference. See the followings.
0° to -90° to180° : No sign (+) Phase delay
0° to +90° to 180°: Negative (-) Phase advance
*
When |P|
＞
S, Q
＝
0.
* Polarity symbol is displayed depending on the voltage-current phase
difference ( θ ).
0° to -90° to180° : No sign (+) Phase delay
0° to +90° to 180°: Negative (-) Phase advance
Wiring system Display value Destination
1P2W
･
1P3W
Q Same as the active power
3P3W (balance)
Q
su
m
(
＝
�
S
sum
2
− P
sum
2
)
3P4W (balance)
Q
sum
(
=Q×3
)
3P4W (unbalance)
Q
sum
(
=Q
1
+Q
2
+Q
3
)
*
Q
n
: Reactive power at the
nth measurement
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