Specifications

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14
14.1 Description
The Protective Relay Interface (PRI/PRS) Module
provides an interface for four independent bi-
directional transfer trip circuits with either
solid-state transistor (PRS) or mechanical contact
(PRI) outputs. The four trip circuits are encoded to
allow each of them to operate independently
without affecting the dependability, security, or
response time of the remaining circuits. The
circuits are also independently programmable,
allowing you to program, or configure, each
circuit for the specific function it is to perform.
The transfer trip circuits are applicable for use in:
• Direct transfer trip
• Permissive overreaching transfer trip
• Permissive underreaching transfer trip
•Directional comparison blocking
•Directional comparison unblocking
• Secure contact status transfer
All PRI/PRS inputs are optically isolated,
accepting a nominal keying voltage between 48
and 250Vdc (specify keying voltage w/order).
Both the transistor and contact outputs carry a one
amp rating. An external tripping relay is required
for direct tripping of breakers.
The module’s interface comes with two terminal
blocks with 10 positions each.
14.2 Application
You can configure each circuit, or function, on a
PRI or PRS module independently of the others.
You configure the circuits (see the FCS online
help facility: Configuring the FOCUS Channel
Modules > Protective Relay Interface Module
(PRI/PRS)…) using the FOCUS Configuration
Software (FCS). The FCS is connected to the
module via the RS-232 “craft interface” on the
front of the FOCUS chassis.
The following text describes the various setting
choices available and provides suggestions for
which settings to use for different applications.
You use the same FCS “Configuration window”
(see Fig. 14-5) for both the PRI and PRS. This is
because the two module types are identical except
for the output functions. The PRI outputs are
relays with contact outputs, whereas the PRS
outputs are solid state switching transistors. The
minimum back-to-back trip time of the PRI is
8.5ms. The PRS has a minimum back-to-back trip
time of 2 ms. Both assume a security setting of 1
ms.
The remainder of this section applies equally to
the PRI and PRS. For simplicity, we will refer to
both the PRI and PRS as simply “PRI” for the
remainder of this chapter.
14. Protective Relay Interface (PRI/PRS)
Ordered As Features ROM Version MV2 MV3 MV4 MV5 FCS Version
PRI, PRS Basic ≤ 19 YES YES NO NO ALL
PRI-A-xxx or Addressed 26 – 99 NO YES YES NO ≥ 3.7
PRS-A-xxx Redundant
PRI-A-xxx or Addressed 27 – 99 NO YES YES YES ≥ 3.12
PRS-A-xxx Redundant
PRI-M-xxx or Multi-Drop ≥ 100 NO YES YES NO ≥ 3.7
PRS-M-xxx Addr. Redundant
PRI-M-xxx or Multi-Drop ≥ 102 NO YES YES YES ≥ 3.12
PRS-M-xxx Addr. Redundant
Table 14–1. PRI ROM Compatibility