Atec Yokogawa-WT1800 - Manual (Page 16)

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Specifications Specifications Specifications
17
Power
Item Specification
Accuracy (six-month) Conditions Same as the accuracy of the voltage and current
Frequency Accuracy
±(Reading error + Measurement range error)
DC ±(0.05% of reading + 0.1% of range)
0.1 Hz ) f < 10 Hz ±(0.3% of reading + 0.2% of range)
10 Hz ) f < 45 Hz ±(0.1% of reading + 0.2% of range)
45 Hz ) f ) 66 Hz ±(0.1% of reading + 0.05% of range)
66 Hz < f ) 1 kHz ±(0.2% of reading + 0.1% of range)
1 kHz < f ) 50 kHz ±(0.3% of reading + 0.2% of range)
50 mV, 100 mV, 200 mV range of the external current sensor input
±(0.5% of reading + 0.2% of range)
Direct input of the 50 A input element
±{(0.1 × f + 0.2)% of reading + 0.2% of range}
50 kHz < f ) 100 kHz ±(0.7% of reading + 0.3% of range)
Direct input of the 50 A input element
±{(0.3 × f - 9.5)% of reading + 0.3% of range}
100 kHz < f ) 200 kHz ±{(0.0105 × f - 0.25)% of reading + 1% of range}
Direct input of the 50 A input element
±{(0.09 × f + 11)% of reading + 1% of range}
200 kHz < f ) 500 kHz ±{(0.0105 × f - 0.25)% of reading + 1% of range}
500 kHz < f ) 1 MHz ±{(0.048 × f - 20)% of reading + 2% of range}
• Add the following value to the above accuracy for the external current sensor range.
Current DC accuracy: 50 μV
Power DC accuracy: (50 μV/External current sensor range rating) × 100% of range
• Add the following value to the above accuracy for the direct current input range.
50 A input element
Current DC accuracy: 1 mA
Power DC accuracy: (1 mA/Direct current input range rating) × 100% of range
5 A input element
Current DC accuracy: 10 μA
Power DC accuracy: (10 μA/Direct current input range rating) × 100% of range
• Accuracy of the waveform display data, Upk and Ipk
Add the following value to the above accuracy (reference value). The effective input range is within ±300% of
range (within ±600% for crest factor 6)
Voltage input: {1.5 × 3(15/range) + 0.5}% of range 3 3
Direct current input range
50 A input element; 3 × 3(1/range)}% of range + 10 mA 3 3
5 A input element: {10 × 3(10 m/range) + 0.5}% of range 3 3
External current sensor input range
50 mV to 200 mV range: {10 × 3(0.01/range) + 0.5}% of range 3 3
500 mV to 10 V range: {10 × 3(0.05/range) + 0.5}% of range 3 3
• Infl uence from a temperature change after zero level compensation or range change
Add the following value to the above accuracy.
Voltage DC accuracy; 0.02% of range/°C
DC accuracy of the direct current input
50 A input element: 1 mA/°C
5 A input element: 10 μA/°C
DC accuracy of the external current sensor input: 50 μV/°C
DC power accuracy: Infl uence from the voltage × Infl uence from the current
• Infl uence from the self-heating caused by voltage input
• Add the following value to the voltage and power accuracy.
AC input signal: 0.0000001 × U 2 % of reading
DC input signal: 0.0000001 × U 2 % of reading + 0.0000001 × U 2 % of range
U is the voltage reading (V).
The infl uence from the self-heating continues until the temperature of the input resistor decreases, even if the
voltage input changes to a small value.
• Infl uence from the self-heating caused by current input
Add the following value to the current and power accuracy of the 50 A element.
AC input signal: 0.00006 × I 2 % of reading
DC input signal: 0.00006 × I 2 % of reading + 0.004 × I 2 mA
Add the following value to the current and power accuracy of the 5 A element.
AC input signal: 0.006 × I 2 % of reading
DC input signal: 0.006 × I 2 % of reading + 0.004 × I 2 % of reading
I is the current reading (A).
The infl uence from the self-heating continues until the temperature of the shunt resistor decreases, even if
the current input changes to a small value.
• Addition to the accuracy according to the data update rate
Add 0.1% of reading when the data update rate is 50 ms and 0.05% of reading when 100 ms.
• Range of guaranteed accuracy by frequency, voltage, and current
All accuracies between 0.1 Hz and 10 Hz are reference values.
If the voltage exceeds 750 V at 30 kHz to 100 kHz, the voltage and power values are reference values.
If the current exceeds 20 A at DC, 10 Hz to 45 Hz, or 400 Hz to 100 kHz, the current and power accuracies are
reference values.
• Accuracy for crest factor 6: Same as the range accuracy of crest factor 3 for twice the range.
Item Specification
Infl uence of power factor ( λ)
When λ = 0
Apparent power reading × 0.1% for the range from 45 to 66 Hz
For frequencies other than the above (Reference values)
5 A input element and external sensor inputs:
Apparent power reading Ч (0.1 + 0.05 Ч f (kHz))%
Direct input of the 50 A input element:
Apparent power reading Ч (0.1 + 0.3 Ч f (kHz))%
When 0 < λ < 1
Power reading × [(Power reading error %) + (Power range error %) ×
(Power range/Apparent power reading) + {tan Ш Ч (Infl uence % when
λ = 0)}]
Ø is the phase angle between the voltage and current.
Infl uence of line fi lter When the cutoff frequency (fc) is 100 Hz to 100 kHz
Voltage/current
Up to (fc/2) Hz: Add 2 × [1 -
3{1/(1 + (f/fc) 3 3 4 }] Ч 100 + (20 Ч f/300 k)% of reading
Power
Up to (fc/2) Hz: Add 4 × [1 -
3{1/(1 + (f/fc) 3 3 4 }] Ч 100 + (40 Ч f/300 k)% of reading
When the cutoff frequency (fc) is 300 kHz and 1 MHz
Voltage/current
Up to (fc/10) Hz: Add (20 × f/fc)% of reading
Power
Up to (fc/10) Hz: Add (40 × f/fc)% of reading
Lead/lag phase detection (D (LEAD)/G (LAG) of the phase angle)
The phase lead and lag can be detected correctly when the voltage and current
input signals are as follows.
• Sine wave
• 50% or more of the measurement range (100% or more for crest factor 6)
• Frequency: 20 Hz to 10 kHz
• Phase angle: ±(5° to 175°)
Symbol s for the reactive power Q ∑ calculation
The symbol s shows the lead/lag of each element, and “-” indicates leading.
Temperature coeffi cient ±0.03% of reading/°C at 5 to 18°C or 28 to 40°C
Effective input range Udc and Idc: 0 to ±110% of the mea easurement range
Urms and Irms: 1 to 110% of the measurement range t
Umn and Imn: 10 to 110% of the measurement range
Urmn and Irmn: 10 to 110% of the measurement range
Power
DC measurement: 0 to ±110%
AC measurement: ±110% of the power range when the voltage and current
range is 1 to 110%.
However, the synchronization source level shall meet the input signal level of
frequency measurement. Each of the lower limits is doubled for crest factor 6.
Max. display value 140% of the voltage and current range rating
Min. display value Displays the following values relative to the measurement range.
• Urms, Uac, Irms, Iac: Up to 0.3% (up to 0.6% for crest factor 6)
• Umn, Urmn, Imn, Irmn: Up to 2% (up to 4% for crest factor 6)
Below that, zero suppress.
Current integration value q also depends on the current value.
Measurement lower limit frequency
Data update rate: 50 ms 100 ms 200 ms 500 ms
Measurement lower limit frequency: 45 Hz 25 Hz 12.5 Hz 5 Hz
Data update rate: 1 s 2 s 5 s 10 s 20 s
Measurement lower limit frequency: 2.5 Hz 1.25 Hz 0.5 Hz 0.2 Hz 0.1 Hz
Accuracy of apparent power S
Voltage accuracy + Current accuracy
Accuracy of reactive power Q
Accuracy of apparent power + ( (1.0004 - λ 2 ) - (1 - λ 2 )) × 100 % of range
Accuracy of power factor λ
± [( λ - λ /1.0002) +|cosØ -cos {Ø+ sin -1 (infl uence of power factor of power when
λ = 0%/100)}|] ±1 digit when voltage and current is at rated input of the
measurement range. Ø is the phase difference of voltage and current.
Accuracy of phase angle Ш
± [| Ш – {cos-1 ( λ /1.0002)| + sin -1 {(infl uence of power factor of power when
λ = 0%)/100}] deg ±1 digit, when voltage and current is at the rated input of the
measurement range.
One-year accuracy Multiply the reading error of the six-month accuracy by a factor of 1.5
Functions
Measurement Functions and Conditions
Item Specification
Crest factor 300 (relative to the minimum valid input)
3 or 6 (when inputting the rated values of the measurement range)
Measurement period Interval for determining the measurement function and performing calculations.
• The measurement period is set by the zero crossing of the reference signal
(synchronization source) excluding watt hour WP and ampere hour q during DC mode
• Harmonic display
The measurement period is from the beginning of the data update interval to 1024
or 8192 points at the harmonic sampling frequency.
Wiring 1P2W (single-phase, two-wire), 1P3W (single-phase, 3-wire), 3P3W (3-phase,
3-wire), 3P4W (3-phase, 4-wire), 3P3W (3V3A) (3-phase, 3-wire, 3-volt/3-amp
measurement)
However, the number of available wiring systems varies depending on the number of
installed input elements.
Scaling When inputting output from external current sensors, VT, or CT, set the current
sensor conversion ratio, VT ratio, CT ratio, and power coeffi cient in the range from
0.0001 to 99999.9999.
Averaging • The average calculations below are performed on the normal measurement
parameters of voltage U, current I, power P, apparent power S, and reactive power Q.
Power factor
λ and phase angle are determined by calculating the average of P and S.
• Select exponential or moving averaging.
Exponential average
Select an attenuation constant from 2 through 64.
Moving average
Select the number of averages from 8 through 64.
• Harmonic measurement
Only exponential averaging is available.
Data update rate Select 50 ms, 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, or 20 s.
Response time At maximum, twice the data update rate (only during numerical display)
Hold Holds the data display.
Single Executes a single measurement during measurement hold.
Zero level compensation/Null
Compensates the zero level. Null compensation range: ±10% of range
Null can be set individually for each of the following input signals.
• Voltage and current of each input element
• Rotation speed and torque
• AUX1 and AUX2
Frequency Measurement
Item Specification
Number of measurement Select up to three frequencies of the voltage or current input to the input elements
for measurement. If the frequency option is installed, the frequencies of the voltages
and currents being input to all input elements can be measured.
Measurement method Reciprocal method
Measurement range Data update rate Measuring range
50 ms
100 ms
200 ms
500 ms
1 s
2 s
5 s
10 s
20 s 45 Hz ) f ) 1 MHz
25 Hz ) f ) 1 MHz
12.5 Hz ) f ) 500 kHz
5 Hz ) f ) 200 kHz
2.5 Hz ) f ) 100 kHz
1.25 Hz ) f ) 50 kHz
0.5 Hz ) f ) 20 kHz
0.25 Hz ) f ) 10 kHz
0.15 Hz ) f ) 5 kHz
Accuracy ±0.06% of reading ±0.1 mHz
When the input signal level is 30% or more of the measurement range
(60% or more for crest factor 6). However:
The input signal is 50% or more of the range.
• The frequency is smaller or equal to 2 times of above lower frequency
• 10 mA range setting of 5 A input element
• 1 A range setting of 50 A input element
The 100 Hz frequency fi lter is ON at 0.15 Hz to 100 Hz, and the 1 kHz frequency fi lter
is ON at 100 Hz to 1 kHz.
Display resolution 99999
Min. frequency resolution 0.0001 Hz
Frequency measurement fi lter
Select OFF, 100 Hz or 1 kHz
Integration
Item Specification
Mode Select a mode from Manual, Standard, Continuous (repeat), Real Time Control
Standard, and Real Time Control Continuous (Repeat).
(