CET Electric Technology
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4)
Logical Module
Logical Module can be programmed to trigger DO, Data Recorder or Waveform
Recorder upon becoming active. Please refer to
Section 4.5
for a detailed
description.
5)
Dip/Swell Setpoint
Dip/Swell setpoint can be programmed to trigger DO, Data Recorder, Waveform
Recorder or Alarm Email upon becoming active. Please refer to
Section 4.3.5
for
a detailed description.
6)
Transient Setpoint:
Transient setpoint can be programmed to trigger DO, Data Recorder, Waveform
Recorder or Alarm Email upon becoming active. Please refer to
Section 4.3.6
for
a detailed description.
Since there are multiple ways to trigger the Digital Outputs on the iMeter 6, a prioritized scheme has been
developed to avoid conflicts between different applications. In general, Front Panel Control has the highest
priority and can override other applications. Remote Control, Control Setpoint, Logical Module, Dip/Swell
Setpoint and Transient Setpoint share the same priority, meaning that they can all be programmed to control the
same Digital Output. This scheme is equivalent to having an implicit Logical OR operation for the control of a
Digital Output and may be useful in providing a generic alarm output signal. However, the sharing of a Digital
Output is not recommended if the user intends to generate a control signal in response to a specific setpoint
condition.
4.1.3
Energy Pulse Outputs
The iMeter 6 comes standard with one Front Panel LED Pulse Output. Energy Pulse Outputs are typically used
for accuracy testing. Energy pulsing can be enabled from the Front Panel through the
Demand & Energy
setup
parameter. The pulse constant can be configured as 1000/3200/5000/6400/12800 pulses per kWh or kvarh
through the
Pulse
Constant
setup parameters.
4.1.4
Analog Input
The iMeter 6 comes optionally with an Analog Input which can be programmed as 0mA to 20mA or 4mA to 20mA
input. There are 3 setup parameters:
Type
:
Select between 0-20mA or 4-20mA input.
AI Zero
:
This value corresponds to the minimum Analog Input of 0 mA (for 0-20mA input) or 4 mA (for
4-20mA input) and has a range of -999,999 to +999,999.
AI Full
:
This value corresponds to the maximum Analog Input of 20 mA and has a range of -999,999 to
+999,999.
For example, to measure the oil temperature of a transformer, connect the outputs of the temperature sensor
to the AI terminals of the iMeter 6. The temperature sensor outputs 4mA when the temperature is -25°C and
20mA when the temperature is 100°C. As such, the
Type, AI FULL and AI ZERO
setup parameters should be
programmed as
4-20mA
, 100 and -25, respectively. Therefore, when the output of the sensor is 20mA, the
reading will be 100.00°C. When the output is 4mA, the reading will be -25.00°C. When the output is 12mA, the
reading will be (100°C - (-25°C)) x (12mA-4mA) / (20mA-4mA) + (-25°C) = 37.50°C.
4.2
Power and Energy
4.2.1
Basic Measurements
The iMeter 6 provides the following basic measurements with 1 second update rate which are available through
the Front Panel or communications
Parameter
Phase A
Phase B
Phase C
Total
Average
Uln
●
●
●
-
●
Ull
●
●
●
-
●
Current
●
●
●
-
●
Neutral Current
-
-
-
In (Calculated)
I4 (Measured)
Residual Current
-
-
-
Ir (Calculated)
-
kW
●
●
●
●
-
kvar
●
●
●
●
-
kVA
●
●
●
●
-
Power Factor
●
●
●
●
-
Frequency
●
-
-
-
-
U Sequence
U1 (Positive Sequence)
U2 (Negative Sequence)
U0 (Zero Sequence)
I Sequence
I1 (Positive Sequence)
I2 (Negative Sequence)
I0 (Zero Sequence)
Table 4-2 Basic Measurements
