Eaton IQ 250, Руководство пользователя и инструкция по установке

Страница: 54 / 142

6-12
IB02601006E
www.eaton.com
Chapter 6:
Using the IQ 250/260 IQ 250/260 Meter
Performing Watt-Hour Accuracy Testing (Verification)
To be certified for revenue metering, power providers
and utility companies must verify that the billing energy
meter performs to the stated accuracy. To confirm the
meter’s performance and calibration, power providers use
field test standards to ensure that the unit’s energy
measurements are correct. Since the IQ 250/260 is a
traceable revenue meter, it contains a utility grade test pulse
that can be used to gate an accuracy standard. This is an
essential feature required of all billing grade meters.
• Refer to Figure 6.5 for an example of how this process works.
• Refer to Table 6.1 for the Wh/Pulse Constants for Accuracy Testing.
Table 6.1: Infrared & KYZ Pulse Constants for Accuracy Testing - Kh Watthour per pulse
Input Voltage Level Class 10 Models Class 2 Models
Below 150V 0.500017776 0.1000035555
Above 150V 2.000071103 0.400014221
NOTE: Minimum pulse width is 90 milliseconds.
Figure 6.5: Using the Watt-Hour Test Pulse
Figure 6.4: Watt-Hour Test Pulse
Watt-Hour
Test Pulse