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ML0044B December 1, 2017 Copyright 2017 Bitronics, LLC
3.2 VT Inputs – VA, VB, VC, VN (See Appendix A1 and Section 1.3)
The PPX II is capable of monitoring two voltage buses, designated as Bus 1
(Terminals 3-6) and Bus 2 (Terminals 7-10). Voltage signals are measured using a
12.06Mohm (12Mohm/60.3Kohm) resistor divider with a continuous voltage rating of
7kV. This ideal impedance provides a low burden load for the VT circuits supplying
the signals. Grounding of VT & CT signals per ANSI/IEEE C57.13.3-2005 is
recommended. The polarity of the applied signals is important to the function of the
instrument.
3.3 CT Inputs – IA, IB, IC (See Appendix A1 and section 1.3)
The instrument should be connected directly with the secondary of an external current
transformer (CT). Connections to the measurement Current (CT) signal inputs on the
PPX II are made at terminals 11-16. The current terminals require the use of #10
rings lugs.
The 5 Amp current inputs feature 10-32 terminals to assure reliable connections. This
results in a robust current input (CT) connection with negligible burden to ensure that
the user’s external CT circuit can’t ever open-circuit, even under extreme fault
conditions. Grounding of CT signals per ANSI/IEEE C57.13.3-2005 is required.
Current inputs: The current inputs are 5 Amp nominal input with internal current
isolation transformer, constructed with 10-32 studs as the current terminals. It is
intended that this meter connect to the output from the secondary circuit of
permanently installed Current Transformers (CTs).
WARNING: Current transformer circuits:
Do not open the secondary circuit of a live CT since the high voltage produced
may be lethal to personnel and could damage insulation.
WARNING: DO NOT loosen existing 10-32 hardware that secures the current input
studs to the front panel. When making connections to the current input studs, use #10
ring lugs. Fasten ring lugs with the 10-32 bagged hardware (flat washer, lock washer,
and nut) provided. DO NOT OVERTORQUE. HAND Tighten with a standard nut
driver. 12 inch-pounds (1.36 N-m) is recommended, MAXIMUM torque is 15 inch-
pounds (1.69 N-m). .
3.4 Ethernet – with built in port switches
The PPX II Ethernet ports meet or exceed all requirements of ANSI/IEEE Std 802.3
(IEC 8802-3:2000) and additionally meet the requirements of part 8-1 TCP/IP T-profile
for physical layer 1 (Ethernet copper interface).
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