Section 1: Product Description; Introduction; Rel300 Construction - ABB REL300 Instruction Manual

1.1

INTRODUCTION

The REL300 relay assembly (Figure 1-1) is a numerical transmission line protection system,
with three zones of distance protection. All measurements and logic are performed by digital
means, using a microprocessor. Self-checking and line monitoring techniques are included.
REL300 is primarily recommended for application on non-series compensated lines.
The non-pilot REL300 relay system is standard (see Section 3); an optional pilot REL300 relay
system is also available (in Section 3).
1.2

REL300 CONSTRUCTION

The standard nomenclature for ABB relay protection equipment is as follows:
• Cabinet - contains fixed-racks, swing-racks, or open racks
• Rack - contains one or more chassis (e.g., the REL300)
• Chassis - contains several modules (e.g., Microprocessor or Power Supply)
• Module - contains a number of functional circuits (on printed circuit board)
• Circuit - a complete function on a printed circuit board (e.g., analog-to-digital conversion)
• The REL300 relay assembly consists of an outer-chassis and an inner-chassis which slides
into the outer-chassis. The REL300 conforms to the following dimensions and weight (see
also Section 2):
• Height 7" (requires 4 rack units; 1.75" each)
• Width 19"
• Depth 13.6"
• Weight 35 Lbs
All of the relay circuitry, with the exception of the input isolation transformers and first-line surge
protection, are mounted on the inner chassis, to which the front panel is attached. The outer
chassis has a Backplate, which is a receptacle for all external connections, including a commu-
nication adaptor (see Figure 4-1). Two FT-14 switches may be included, as options, in the two
peripheral areas of the outer chassis. The FT-14 switches permit convenient and safe discon-
nection of trip, ac and dc input circuits, and provide for injection of test signals.
The REL300 relay provides the following contact outputs:
• 4 make contacts (2 trip, 2 BFI); 8 additional optional contacts when single pole trip option is
used.
• Single pole reclose initiate (2 Form A)
• Three pole reclose initiate (2 Form A)
• Reclose block (2 Form A)
• General Start (1 Form A)
• System failure alarm (1 Form C)
• Trip alarm (1Form C; 1 Form A is available if SBP is not used).
• 8 additional programmable contacts when the Contact module is used.
Section 1. PRODUCT DESCRIPTION
I.L. 40-385.7
1-1