Specifications
Wattmeters
Mechanical Indicators
53
Specifications
Size (width ✕ height) mm
Model name
Operation principle
Accuracy (grade)
Frequency
Scale length (mm)
Weight (kg)
Indicator rating and delivery period classification
Rectangular indicators
64✕60
YP-206NW
85✕75
YP-208NW
100✕85
YP-210NW
82✕82
YP-8NW
102✕102
YP-10NW
Page with outer dimensions drawing
Y-2N Series Y-N Series
55
0.07
70
0.1
85
0.1
50 and 60Hz
70
0.1
90
0.15
Transducer
2.5
Transducer
2.5
Rating
3635
T-150
T-150
T-150
T-150
T-150
T-150
T-150
T-150
Secondary
rating
Indicator
rating
(Po) kW
Circuit
1-phase
2-wire
1-phase
3-wire
3-phase
3-wire
3-phase
4-wire
110V 5A
220V 5A
100/200V 5A
110V 5A
220V 5A
/110V 5A
110/190V 5A
220/380V 5A
0.4~0.6
0.8~1.2
0.8~1.2
0.8~1.2
1.6~2.4
0.8~1.2
1.4~2.0
2.8~4.0
110
3
1.0
1.0
0.5
0.5
0.5
2.2
4.4
1.6
1.6
3.2
1.6
2.8
3.5
0.5
0.5
0.5
1.0
1.0
1.0
I
1
I3
I2
Voltage circuit
Delivery period
classification
Accessory
Voltage circuit
Delivery period
classification
Accessory
Voltage circuit
Delivery period
classification
Accessory
Voltage circuit
Delivery period
classification
Accessory
Voltage circuit
Delivery period
classification
Accessory
Consumption VA
Current circuit
T-150
T-150
T-150
T-150
T-150
T-150
T-150
T-150
1.0
1.0
0.5
0.5
0.5
2.2
4.4
1.6
1.6
3.2
1.6
2.8
3.5
0.5
0.5
0.5
1.0
1.0
1.0
I
1
I3
I2
Consumption VA
Current circuit
T-150
T-150
T-150
T-150
T-150
T-150
T-150
T-150
1.0
1.0
0.5
0.5
0.5
2.2
4.4
1.6
1.6
3.2
1.6
2.8
3.5
0.5
0.5
0.5
1.0
1.0
1.0
I
1
I3
I2
Consumption VA
Current circuit
T-150
T-150
T-150
T-150
T-150
T-150
T-150
T-150
1.0
1.0
0.5
0.5
0.5
2.2
4.4
1.6
1.6
3.2
1.6
2.8
3.5
0.5
0.5
0.5
1.0
1.0
1.0
I
1
I3
I2
Consumption VA
Current circuit
T-150
T-150
T-150
T-150
T-150
T-150
T-150
T-150
1.0
1.0
0.5
0.5
0.5
2.2
4.4
1.6
1.6
3.2
1.6
2.8
3.5
0.5
0.5
0.5
1.0
1.0
1.0
I
1
I3
I2
Consumption VA
Current circuit
YP-10NWYP-208NW
Remarks
(1) In regards to
“
Indicator rating (Po) kW
”
in the “Rating” column:
(2) Bidirectional deflection indicators can also be manufactured.
(3) Models with a 1A current rating can also be manufactured; the power consumption is basically the same as that of a 5A model.
The indicator rating value in this case is calculated by substituting 1A in place of 5A in the equations of Remarks (1).
(4) The T-150 rectifier is a dedicated accessory (non-compatible accessory), and thus cannot be used in combinations other than those designated for the
indicators. The distance between the indicator and the T-150 rectifier must be 5m or less, or the round-trip lead wire resistance must be 0.5Ω or less.
(5) The weight of the T-150 accessory rectifier is approximately 1kg.
(6) Use a wattmeter with an input voltage in the range of 85 to 115% of the rated value (rated voltage ±15%).
The indication may be unstable when used with an input voltage of 85% or less of the rating or the input voltage is switched on and off.
(7) Please make sure to read the “Safety Precautions” (pp.5-8) and the “Selection Precautions” (p.9) to assist in selecting the model and use specifications
suited to the application.
Scale calculation formula for wattmeter
Phase-wire system
1-phase 2-wire
1-phase 3-wire
3-phase 3-wire
3-phase 4-wire
Scale calculation formula for wattmeter
Indicator scale P (kW)=VT ratio ✕ CT ratio ✕ Po (0.4~0.6)
Indicator scale P (kW)=CT ratio ✕ Po (0.8~1.2)
Indicator scale P (kW)=CT ratio ✕ Po (0.8~1.2)
Indicator scale P (kW)=VT ratio ✕ CT ratio ✕ Po (0.8~1.2)
Indicator scale P (kW)=CT ratio ✕ Po (1.6~2.4)
Indicator scale P (kW)=VT ratio ✕ CT ratio ✕ Po (0.8~1.2)
Indicator scale P (kW)=VT ratio ✕ CT ratio ✕ Po (1.4~2.0)
Indicator scale P (kW)=VT ratio ✕ CT ratio ✕ Po (2.8~4.0)
Secondary rating
110V 5A
220V 5A
100/200V 5A
110V 5A
220V 5A
/110V 5A
110/190V 5A
220/380V 5A
110
3
Remarks
The value at the left is
multiplied by 1/5 in the case of
a CT secondary current of 1A.
Calculation example: In the case of a 3-phase, 3-wire circuit, VT 6600/110V and CT 100/5A
Indicator scale P (kW)= ✕✕Po (0.8~1.2) = 960~1440kW
Therefore, wattmeters can be manufactured with a scale of 960–1440kW.
This varies slightly according to the rating. Refer to the Wattmeter Scale Selection Reference Table on p.58 for details.
1-phase, 2-wire
wattmeters
3-phase, 3-wire
wattmeters
Po=110V✕5A=550 0.5kW (Po=0.4 to 0.6kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
Po=220V✕5A=1100 1.0kW (Po=0.8 to 1.2kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
Po= ✕110V✕5A=953 1kW (Po=0.8 to 1.2kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
Po= ✕220V✕5A=1906 2kW (Po=1.6 to 2.4kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
3
3
⎧
⎨
⎩
⎧
⎨
⎩
3-phase, 4-wire
wattmeters
Po
=
3✕ V✕5A
=
✕110V✕5A=953 1kW
(Po=0.8 to 1.2kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
Po=3✕110V✕5A= ✕190V✕5A=1650 1.7kW
(Po=1.4 to 2.0kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
Po=3✕220V✕5A= ✕380V✕5A=3300 3.4kW
(Po=2.8 to 4.0kW, taking into account adjustment range multiplying factors of 0.8 to 1.2)
3
3
3
⎧
⎪
⎨
⎪
⎩
110
3
6600
110
100
5