YOKOGAWA 2042, User Manual

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— 4 — IM 2042-01
1. 結線方法
(1) 三相電力測定
Fig. 2-1 のように電圧の “P
1
” , “P
3
” を負荷側にして “P
1
” と R 相
の “A”，“P
3
” と T 相の “A” を結線します。
負荷電力 (Watt) ＝ 計器の読み×乗数
(2) 電流が定格値をこえる場合の三相電力測定
Fig. 2-2 のように電流回路に計器用変流器（CT）を接続します。
負荷電力 (Watt) ＝ 計器の読み×乗数×変流比
(3) 電圧が定格値をこえる場合の三相電力測定
Fig. 2-3 のように電圧回路に計器用変圧器（VT）を接続して測定
します。
負荷電力 (Watt) ＝ 計器の読み×乗数×変圧比
1. Connections
1. Three-phase power measurement
As shown in Figure 2-1, connect the “P
1
” terminal to the R-phase terminal “A”
and the “P
3
” terminal to the T-phase terminal “A”, making sure that both of
these voltage terminals “P
1
” and “P
3
” are connected to the load side
Measured power (watt)
= indicator reading × range multiplier
2. Three-phase power measurement where the current exceeds the rated value
Connect a current transformer (CT) to a current circuit as shown in Figure
2-2.
Measured power (watt)
= indicator reading × range multiplier × CT ratio
3. Three-phase power measurement where the voltage exceeds its rated value
Connect a voltage transformer (VT) to a voltage circuit as shown in Figure
2-3.
Measured power (watt)
= indicator reading × range multiplier × VT ratio
±
±
Fig. 2-1
±
±
Fig. 2-2
±
±
Fig. 2-3
電源
Power Source
R
S
T
負荷
Load
電源
Power Source
R
S
T
負荷
Load
L K
k
CT
CT
L K
k
電源
Power Source
R
S
T
負荷
Load
V
v
U
u
V
v
U
u
VT VT