Atec Yokogawa-WT3000 - Manual (Page 12)

12
Precision Power Analyzer WT3000
(U1+U2)/2
(I1+I2)/2
P1+P2
S1+S2
U Σ [V]
I Σ [A]
P Σ [W]
S Σ [VA]
Q Σ [var]
Pc Σ [W]
WP Σ [Wh]
WP+ Σ [Wh]
WP– Σ [Wh]
q Σ [Ah]
q+ Σ [Ah]
q– Σ [Ah]
WQ Σ [varh]
WS Σ [VAh]
λΣ
Ø Σ [˚]
3 phase, 3 wire
3 phase, 3 wire
(3 voltage 3 current) 3 phase, 4 wire
P Σ 2 +Q Σ 2
TYPE1,
TYPE2
TYPE3
TYPE1
TYPE2
TYPE3
S1+S2+S3
Q1+Q2+Q3
Q1 + Q2 + Q3
Pc1 + Pc2 + Pc3
WP1 + WP2 + WP3
WP+1 + WP+2 + WP+3
WP-1 + WP-2 + WP-3
q1+q2+q3
q+1 + q+2 + q+3
q-1 + q-2 + q-3
P1+P2+P3
N
1
Σ
N
n=1
| Q Σ (n) | × Time
N
1
S Σ
P Σ
Σ
N
n=1
S Σ ( n ) × Time
cos
- 1
S Σ
P Σ
( )
3
2
3
3
(S1+S2) (S1+S2+S3)
S Σ 2 –P Σ 2
Single-phase,
3 wire
(U1+U2+U3)/3
(I1+I2+I3)/3
Q1+Q2
Q1+Q2
Pc1 + Pc2
WP1 + WP2
WP+1 + WP+2
WP–1 + WP–2
q1 + q2
q+1 + q+2
q–1 + q-2
Q Σ ( n ) is the nth reactive power Σ function , and N is the number of data updates.
S Σ ( n ) is the nth apparent power Σ function, and N is the number of data updates.
η [%]
User-defined functions
F1–F20 Create equations combining measurement function symbols, and calculate up to
twenty numerical data.
Set a efficiency calculation up to 4
Waveform display items Voltage and current from elements 1 through 4
Motor version torque and waveform of revolution speed
WT3000 SPEC
WT3000 Specifications
Inputs
Item Specification
Input terminal type Voltage
Plug-in terminal (safety terminal)
Current
• Direct input: Large binding post
• External sensor input: Insulated BNC connector
Input type Voltage
Floating input, resistive potential method
Current
Floating input, shunt input method
Measurement range Voltage
(rated value) 15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V, 1000 V (for crest factor
3)
7.5 V, 15 V, 30 V, 50 V, 75 V, 150 V, 300 V, 500 V (for crest factor 6)
Current (2A input element)
• Direct input:
5mA, 10mA, 20mA, 50mA, 100mA, 200mA, 500mA, 1A, 2A (for
crest factor 3)
2.5mA, 5mA, 10mA, 25mA, 50mA, 100mA, 250mA, 500mA, 1A
(for crest factor 6)
• External sensor input:
50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, and 10 V (for crest
factor 3)
25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V, and 5 V (for
crest factor 6)
Current (30A input element)
• Direct input:
500 mA, 1 A, 2 A, 5 A, 10 A, 20 A, and 30 A (for crest factor 3)
250 mA, 500 mA,1 A, 2.5 A, 5 A, 10 A, and 15 A (for crest factor
6)
• External sensor input:
50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, and 10 V (for crest
factor 3)
25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V, and 5 V (for
crest factor 6)
Input impedance Voltage
Input resistance: Approx. 10 M
Ω , input capacitance: Approx. 5 pF
Current (2A input element)
• Direct input: Approx. 500 m
Ω + approx. 0.07 µ H
• External sensor input: Input resistance: Approx. 1 M Ω , input
capacitance: Approx. 40 pF
Current (30A input element)
• Direct input: Approx. 5.5 m
Ω + approx. 0.03 µ H
• External sensor input: Input resistance: Approx. 1 M Ω , input
capacitance: Approx. 40 pF
Instantaneous maximum Voltage
allowable input
Peak value of 2500 V or RMS value of 1500 V, whichever is less.
(1s or less) Current (2A input element)
• Direct input: Peak value of 9 A or RMS value of 3 A, whichever is
less.
• External sensor input: Peak value less than or equal to 10 times
the measurement range.
Current (30A input element)
• Direct input: Peak value of 150 A or RMS value of 50 A,
whichever is less.
• External sensor input: Peak value less than or equal to 10 times
the measurement range.
Continuous maximum Voltage
allowable input Peak value of 1600 V or RMS value of 1100 V, whichever is less.
Current (2A input element)
• Direct input: Peak value of 6 A or RMS value of 2.2 A, whichever
is less.
• External sensor input: Peak value less than or equal to 5 times
the measurement range.
Current (30A input element)
• Direct input: Peak value of 90 A or RMS value of 33 A, whichever
is less.
• External sensor input: Peak value less than or equal to 5 times
the measurement range.
Continuous maximum common mode voltage (50/60 Hz)
Voltage input terminals, current input terminals
1000 Vrms
External current sensor input connector
600 Vrms
Rated voltage to ground Voltage input terminals, current input terminals
1000 V
External current sensor input connector
600 V
Influence from common mode voltage
Apply 1000 Vrms with the voltage input terminals shorted and the
current input terminals open.
• 50/60 Hz:
± 0.01% of range or less
• Reference value up to 200 kHz
Voltage:
± 3/range × f% of range or less. However, 3% or less.
Current direct input and current sensor input:
± (max. range/range) Ч 0.001 Ч f% of range or less.
However, 0.01% or more. The units of f are kHz. The max. range
within equations is 30 A or 2 A or 10 V.
Line filter Select OFF, 500 Hz, 5.5 kHz, or 50 kHz.
Frequency filter Select OFF, or ON
A/D converter Simultaneous voltage and current conversion and 16-bit resolution.
Conversion speed (sampling rate): Approximately 5
µ s. See
harmonic measurement items for harmonic display.
Range switching Can be set for each input element.
Auto range functions Increasing range value
• When the measured values of U and I exceed 110% of the range
rating
• When the peak value exceeds approximately 330% of the range
rating (or approximately 660% for crest factor 6)
Decreasing range value
• When the measured values of U and I fall to 30% or less of the
range rating, and Upk and Ipk are 300% or less of the lower
range value (or 600% for crest factor 6)
Display
Display 8.4-inch color TFT LCD monitor
Total number of pixels* 640 (horiz.) x 480 (vert.) dots
Waveform display resolution
501 (horiz.) x 432 (vert.) dots
Same as the data update rate.
Exceptions are listed below.
• The display update interval of numeric display (4, 8, and 16 items) is 250 ms when the
data update rate is 50 ms or 100 ms.
• The display update interval of numeric display (ALL, Single List, and Dual List) is 500 ms
when the data update rate is 50 ms to 250 ms.
• The display update rate of the trend display, bar graph display, and vector display is 1 s
when the data update rate is 50 ms to 500 ms.
• The display update interval of the waveform display is approximately 1 s when the data
update rate is 50 ms to 1 s. However, it may be longer depending on the trigger setting.
* Up to 0.02% of the pixels on the LCD may be defective.
Calculation Functions
Note1) The instrument’s apparent power (S), reactive power (Q), power factor (l), and phase
angle (Ø) are calculated using measured values of voltage, current, and active power.
(However, reactive power is calculated directly from sampled data when TYPE3 is
selected.) Therefore, when distorted waveforms are input, these values may be different
from those of other measuring instruments based on different measuring principals.
Note 2) The value of Q in the Q Σ calculation is calculated with a preceding minus sign (-) when
the current input leads the voltage input, and a plus sign when it lags the voltage input,
so the value of Q
Σ may be negative.
Waveform Display (WAVE display)