2.19
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Installation
Rear-Panel Connections
Step 10. Set the respective gain and offset channels using the SET
command with the calculated values.
Step 11. Verify the calibrated accuracy for each channel.
Step 12. Repeat this process for each channel
RTD Inputs
The device supports as many as ten PT100, NI100, NI120, or CU10 type RTD
inputs with a measurement range of –50°C to 250°C. Inputs are divided into two
isolated banks of five channels each. See Specifications on page 1.7 for type test
performance and compliance.
Each channel provides a plus, minus, and return (COMP/SHLD) terminal that
will accept wire as large as 18 AWG. The return lead provides a means for lead-
resistance compensation. For best lead-resistance compensation, all three leads
should be the same length and wire gauge. Maximum lead resistance is 25 Ω. Use
18 to 24 AWG wire gauge for the leads. SEL recommends that you use Belden
8771 or similar cable. Cable shield should be connected to ground at the device
(use the COMP/SHLD terminal for shield grounding). Performance to all specifi-
cations is guaranteed only when you use shielded RTD cables (twisted leads) no
longer than 10 meters. When RTD cables longer than 10 meters are used, confor-
mance to IEC 60255-22-1 and IEC 60255-22-5 is no longer guaranteed. The
RTD probe should accommodate any additional isolation necessary for voltages
greater than ±2500 Vdc at the tip/measuring point.
Be sure to connect wiring to the RTD inputs with the correct polarity. The 3-wire
configuration illustrated in Figure 2.14 applies to both the RTD card and Univer-
sal Temperature card.
Current Connections
The default Measurement Category for SEL Products is Measurement Category
II (CAT II). For rated maximum voltage and rated maximum current see
Section 1: Introduction and Specifications. Figure 2.15 shows a three-phase
power transformer with the three-phase CTs from the transformer connected to
the phase CTs of the device, and the neutral CT from the transformer connected
to the neutral CT of the device.
Figure 2.14 RTD Card and Universal Temperature Card 3-Wire RTD Wiring
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