ABB REL-300 User manual

Instruction Manual V2.71
Relay Division
Coral Springs, FL 33065
ABB Power T&D Company Inc.
954 752-6700 800 523-2620
❖April 1996 ❖
4300 Coral Ridge Drive
40-385.7A
ABB Network Partner
REL300
Relay System

MDAR REVISION NOTICE
CHANGE SUMMARY:
A CHANGE BAR ( | ) LOCATED IN THE MARGIN REPRESENTS A
TECHNICAL CHANGE TO THE PRODUCT.
DATE REV LEVEL PAGES REMOVED PAGES INSERTED
4/96 Released

I.L. 40-385.7
iv
ItisrecommendedthattheuserofREL300equipmentbecomeacquaintedwiththeinformationinthisinstruction
leaflet before energizing the system. Failure to do so may result in injury to personnel or damage to the equip-
ment, and may affect the equipment warranty. If the REL300 relay system is mounted in a cabinet, the cabinet
must be bolted to the floor, or otherwise secured before REL300 installation, to prevent the system from tipping
over.
All integrated circuits used on the modules are sensitive to and can be damaged by the discharge of static elec-
tricity. Electrostatic discharge precautions should be observed when handling modules or individual
components.
ABB does not assume liability arising out of the application or use of any product or circuit described herein.
ABB reserves the right to make changes to any products herein to improve reliability, function or design. Spec-
ifications and information herein are subject to change without notice. All possible contingencies which may
arise during installation, operation, or maintenance, and all details and variations of this equipment do not pur-
port to be covered by these instructions. If further information is desired by purchaser regarding a particular in-
stallation, operation or maintenance of equipment, the local ABB representative should be contacted.
Copyright ©ASEA BROWN BOVERI, ABB Power T&D Company Inc.1990, 1991, 1992,1993, 1994, 1995, 1996
This document contains information that is protected by copyright. All rights are reserved. Reproduction, adapta-
tion, or translation without prior written permission is prohibited, except as allowed under the copyright laws.
ABB does not convey any license under its patent rights nor the rights of others.
Trademarks
All terms mentioned in this book that are known to be trademarks or service marks are listed below.
In addition, terms suspected of being trademarks or service marks have been appropriately capital-
ized. ABB Power T&D Company Inc. cannot attest to the accuracy of this information. Use of a term
in this book should not be regarded as affecting the validity of any trademark or service mark.
IBM and PC are registered trademarks of the International Business Machines Corporation
WRELCOM is the registered trademark of the ABB Power T&D Company Inc.
INCOM is the registered trademark of the Westinghouse Electric Corporation
!CAUTION

I.L. 40-385.7
v
PREFACE
Scope
This manual describes the functions and features of the REL300 Relay System. It is intended primarily for use
by engineers and technicians involved in the installation, testing, operation and maintenance of the REL300 sys-
tem.
Equipment Identification
The REL300 equipment is identified by the Catalog Number on the REL300 chassis nameplate. The Catalog
Number can be decoded by using Catalog Number Table 3-1 on page 3-51 of section 3.
Production Changes
When engineering and production changes are made to the REL300 equipment, a revision notation (SUB #) is
reflected on the appropriate schematic diagram, and associated parts information. Refer to I.L. 40-385.11 for
current sub number information.
Equipment Repair
Repair work is done most satisfactorily at the factory. When returning equipment, carefully pack modules and
other units, etc. All equipment should be returned in the original packing containers if possible. Any damage due
to improperly packed items will be charged to the customer.
Document Overview
The circuitry is divided into 6 standard modules and one option module. Section 1 provides the Product Descrip-
tion, which includes software functions. Section 2 presents the Specifications. Section 3 presents Pilot and Non-
Pilot applications with related Catalog Numbers for ordering purposes. REL300 Installation, Operation and
Maintenance are described in Section 4, with related Setting Calculations in Section 5. Acceptance Tests for
both Non-Pilot and Pilot System are described in Appendix A & B . The Index shows Index to Nomenclature.
System Diagrams are included in the Diagrams section at the back of the book.
Contents of Relay System
The REL300 Relay System includes the style numbers, listed below, with appropriate sub numbers (represent-
ing revision levels) for each module. Addenda pages may be included (representing future revisions).
Module Style
• Backplane 1609C23
(Sub-Backplane Xfmr) 1498B70
• Interconnect 1611C30
• Option 1608C39
• Filter 1608C38
• Microprocessor 1611C14
• Display 1609C01
• Power Supply 1608C35
Software System
REL300 software version V2.71 is included in this I.L.
Setting Nomenclature Appliques
If this I.L. is included as part of the shipment of an REL300 Relay system, the I.L. will contain setting nomencla-
ture appliques which can be placed in a convenient location, e.g., inside the two FT-14 covers. The appliques
provide a convenient (and complete) set of REL300 “settings” (see Table 4-1 on page 4-16 of section 4 for set-
ting nomenclature). There are two appliques which are printed protective sheets (contained in a plastic enve-
lope); the back of the sheets can be removed thereby exposing a stick-on surface.

I.L. 40-385.7
vi
• 3-Zone phase and ground distance relay, with re-
versible Zone 3 phase and ground; 4 impedance
units per zone: 3 phase-to-ground; 1 phase-to-
phase.
• Selectable Zone 1 extension
• Zone 1 timer (0 to 15 cycles)
• Independent timers for phase and ground (T2G,
T2P, T3G, T3P)
• Inverse time directional or non-directional (select-
able) ground overcurrent backup logic
• Loss of potential supervision (LOP)
• Loss of current monitoring (LOI)
• Overcurrent supervision of phase and ground dis-
tance
• Instantaneous forward directional phase and
ground highset overcurrent trip (ITP and ITG)
• Close Into Fault Trip (CIFT)
• Stub Bus Protection (89b)
• Unequal-pole-closing load pickup logic
• Selectable Loss-of-Load accelerated trip logic
• Current change fault detector (∆I)
• Voltage change fault detector (∆V)
• Line voltage, current and phase angle monitor.
• Last Fault LED now blinks once for a single fault
and twice for more than one fault. When the RE-
SET button is depressed, the flashing LED is re-
set, and the displayed data is returned to the
Volts/Amps/Angle...metering mode. REL300 fault
data memory cannot be cleared from the front
panel. Fault data can be accessed by selecting
Last Fault or Previous Fault Display Mode.
• Selectable polarizing for directional O/C ground
units (ZSEQ/NSEQ/DUAL)
• Programmable Reclose initiation and reclose
block (RB) outputs; Reclose Initiate (RI2) can be
enabled with the selection of:
– 1PR for φG fault
– 2PR for φG or φφ fault
– 3PR for φG or φφ fault or 3φfault
• Numerical (Digital) Processing
• Fault locator
• Self-checking software with Failure Alarm and
Displayed error codes
• Input contact status check for input circuits
• Push-to-close test for output contacts
• Software switches for functional tests, e.g., TK
(SEND), RS1, RS2 and RS12 (Receivers).
• Trip contact sealed by trip current, with selectable
dropout delay timer, 0/50 ms.
• Real-time clock
• 16 fault record storage with selectable capture
mode.
• 16 sets of oscillographic data and intermediate
target data. Each set includes 7 analog graphic
inputs and 24 digital intermediate targets with 8
samples per cycle. Each analog input contains 1
prefault and 7 fault cycles.
• Selectable oscillographic data capture setting
trip, Z2PU, Z2Z3 or ∆V/∆I.
• Selectable Data Capture Setting (FDAT) - TRIP,
Z2PU/TRIP, Z2Z3/TRIP.
• Logic for load restrictions
• Selectable phase sequence rotation of ABC or
ACB
• Out-of-Step block logic
Features Included in Version V2.71
The following features are standard for the Non-Pilot REL300 V2.71:

I.L. 40-385.7
vii
• All features listed as standard for the Non-Pilot
REL300 V2.70 are included in the Pilot system
• Independent pilot phase and ground distance
units
• Complete Logic and Channel Interface for:
– Permissive Overreach Transfer Trip (POTT) /
Simplified Unblocking
– Permissive Underreach Transfer Trip (PUTT)
– Directional Comparison Blocking Scheme
(BLK)
– POTT or Simplified Unblocking Weakfeed
• Instantaneous Forward Directional Overcurrent
Function for High Resistance Ground Fault
Supplement to Overreach Pilot, with adjustable
timer (from 0 to 15) in 1 cycle steps or Block
• Instantaneous Reverse Directional Overcurrent
Ground Function
– Carrier Ground Start on Blocking Scheme
– Weakfeed System Application
• Reclose Block on Breaker Failure (BF) Squelch
• 3-Terminal Line Application
• Weakfeed Trip
• Choice of rear communications port options:
RS232C W/IRIG B PORT/PONI
RS232C/PONI or
INCOM®/PONI
• Optional graphic software program (OSCAR).
• Built-in FT-14 test switches
• Optional Programmable Output Contacts. Eight
additional contacts chosen from 30 functions.
• Single-Pole-Trip (SPT) logic and outputs: Consult
Factory
Features Included in Version V2.71
The following features are standard for the Pilot REL300 V2.71:
Features Included in Version V2.71
The following features are optional for the Non-Pilot and the Pilot REL300 V2.71
1. Changed 3V0 from 3 volt to 1 volt for the direc-
tional units in order to increase the sensitivity for
Zone-2 and Zone 3 applications.
2. Changed the FDOG pickup angles, 3I0 leading
3V0 between 75 and 255 degrees to overcome
the phase shift due to the connection of ground
resistors.
3. Changed the RDOG timer from 16/0 to 33/0 ms.
For a 3-phase fault at 0% location, the RDOG
may pickup momentarily and may start the TBM
(Carrier keying); therefore, it may delay the pilot
trip action.
NOTE: for the pilot application, the setting of
FDGT must be equal to or greater than 3 cycles.
4. Changed the LOIB timer from 0.5/0.5 to 10/0.5
seconds in order to prevent the block of Z2G,
Z3G and GB tripping if the settings of T2G and/or
T3G are greater than 0.5 seconds.
5. Changed the LOPB logic by removing the lead
between LOP (8/0) and AND1G.
6. Corrected the angle display for the 1-amp ct ap-
plication. Now, the angle display is extended from
50% to 10% of the ct rating.
7. Removed the GS control function and remove
LOP and LOI from Alarm-1. Reassigned the GS
contact as LOP or LOI alarm (AL-3).
8. Extended the setting range of XPUD from 0.300 -
1.500 to 0.050 - 1.500 settings.
9. Reduced the pickup and dropout timing errors of
the PCO-4 and PCO-8 timers and limited the tol-
erance within 1 cycle of the setting values.
Significant Changes to Version 2.71 (From V2.70)

I.L. 40-385.7
viii
Please refer to system drawing 2865F41 Sub 2, in I.L. 40-385.4 and drawing 2693F60 in I.L. 40-385.6 for the
following changes.
1. GENERAL APPLICATION UPGRADES
a) CIF trip logic – Added a timer 200/0 between OR222A and AND22 by changing the setting of CIF se-
lection, e.g., the CIF trip with or without the timer is now determined by user. Refer to section 3.4.7 for
the new settings and application.
b) Added an adjustable T1 timer from 0 to 15 cycles in one-cycle steps.
c) Changed the setting ranges of PANG and GANG from 40-90 to 0-90 degrees and ZR setting from 0.1-
7.0 to 0.1-10.0 for underground cable application.
d) Changed LOPB setting from NO/YES to NO/DIST/ALL, i.e., added a setting “ALL” to block trip for LOP
condition. The setting of LOPB=DIST is equivalent to “YES”, i.e., block the distance units only.
e) Added PTRI setting (YES/NO) to control the pilot reclose.
f) Added an OR62E gate between the signal T1RI and switch Z1RI for Zone-1 and IT reclose. The
OR62E has three inputs – ITP, ITG and T1RI.
g) Correct the GB trip target error if the input trip currents are removed instantly after the closure of the
trip contacts.
h) Improved Phase Selector for single-pole trip with load current condition.
i) Added NOT logic selection in programmable contact outputs.
j) Desensitized FDOG and RDOG from 3V0 > 1 volt to 3V0 > 3 volts.
k) Can use the pre-fault phase voltages (FDOP) to supervise the Zone-1 and pilot trip for 3-phase fault
condition.
2. POTT SYSTEM IMPROVEMENTS
a) Added a path and an inverter between the output of OR16 and the input of AND45A. Removed the path
between the TBM timer (0/50) and AND45, and added a path and inverter between the TBM timer &
AND34. The TBM is now reset after the PLTG or PLTP picks up for three cycles.
b) Added a path from AND30A (PILOT) to the input of AND65A, i.e., the weakfeed application is for POTT
scheme only.
c) Changed the input of AND49A and AND49E from TRSL to TRSLA (TRSLB or TRSLC for single-pole
trip and keying application).
3. BLOCKING SYSTEM APPLICATIONS
a) Carrier keying logic was modified to speed up resetting TBM for certain types of evolving faults by
changing the input of AND24 from HST to TRSLA/TRSLB/TRSLC.
4. SINGLE-POLE TRIP LOGIC
a) Changed the faulty phase voltage from 0 to the pre-fault voltage after the single-pole trips.
b) Added a negated X2 to disable the LOIB logic and allows the 62T trip under the pole disagreement
condition.
5. SELF-CHECK
a) A self-test was added to indicate the opto-input status in the test mode.
Significant Changes to Version V2.70 (from V2.10)
(For customers who are familiar with Version 2.00 and beyond)

I.L. 40-385.7
ix
IMPORTANT APPLICATION NOTES
1. PILOT SYSTEM
a) The setting of Z3FR must be set to “REV” for system transient block and unequal pole external fault
clearing.
b) The minimum setting of FDGT should be 3 cycles unless for some special application.
c) Refer to section 3.4.7 for the setting of CIF if two REL300 relays control a single breaker and share a
common 52b output.
2. LOAD LOSS TRIP (LLT)
For a system if its maximum tapped load may exceed minimum through-load in the protected line, the set-
ting of LLT should be set to “NO”. Refer to section 3.4.9 for the detailed information.
3. PHASE ROTATION
Check JMP-3 on the Microprocessor module. Position JMP-3 is used for ACB rotation if a jumper is placed.
Normally JMP-3 should be out for a system with phase rotation ABC.
4. PANG, GANG and ZR SETTINGS
The settings of PANG and GANG have been expanded from 40-90 to 0-90 degrees and the ZR setting has
been changed from 0.1-7.0 to 0.1-10.0 for underground cable application. The setting rule of PANG, GANG
and ZR must be followed: if the setting difference of PANG and GANG is greater than 50 degrees OR the
ZR setting is greater than 7.0, the operating range of the maximum fault current should be limited to 200
amperes; otherwise, the microcontroller may give an un-predicted result.
NOTE: CONVERSION FROM REL300 FIRMWARE VERSION V2.70 to V2.71 CAN BE
ACCOMPLISHED AS FOLLOWS:
1. Standardprecautionsofstaticvoltagedischargesshouldbeobservedsuchasusingagroundedwriststrap
when handling Integrated Circuits.
2. Remove chips U103, U104, and U202 from the Microprocessor module.
3. Replace chips U103 (G19) and U104 (G20) and U202 into the sockets.
4. Check Jumper #3 on Microprocessor module for rotation ABC or ACB system which is shown on the Me-
tering mode. Normally, JMP3 should be “OUT” for ABC system. Spare jumpers should be placed on loca-
tions JMP10, 11 or 12. Remove any spare jumper (JMP10, 11 or 12) and replace it to JMP3 position for
ACB system.
5. Check Jumper #2 on Microprocessor module. Position 2-3 is used for single-pole trip logic only and posi-
tion 1-2 is used for three-pole trip or programmable output contact logic.
6. Reprogram REL300 password through INCOM®remote communication.
7. It is recommended to verify the relay’s operation per Section 2 of Appendix H (Acceptance/Maintenance
Tests).

I.L. 40-385.7
x
SECTION 1: PRODUCT DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
1.1 INTRODUCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
1.2 REL300 CONSTRUCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
1.3 REL300 MODULES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-2
1.3.1 Backplane Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-2
1.3.2 Interconnect Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-2
1.3.3 Option Module/Contact Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-3
1.3.4 Filter Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-3
1.3.5 Microprocessor Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-3
1.3.6 Display Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-4
1.3.7 Power Supply Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-4
1.3.8 Contact Outputs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-5
1.4 TEST ACCESSORIES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-5
1.5 FAULT DETECTION SOFTWARE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-5
1.5.1 Background Mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-5
1.5.2 Fault Mode and Restricted Fault Tests - - - - - - - - - - - - - - - - - - - - - - - - 1-6
1.5.3 Unique Qualities of REL300 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-6
1.6 SELF-CHECKING SOFTWARE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-6
1.7 UNIQUE REMOTE COMMUNICATION (WRELCOM®) PROGRAM - - - - - - - - - - - - - - 1-7
1.8 POWER SYSTEM ROTATION ABC OR ACB SELECTION - - - - - - - - - - - - - - - - - - 1-7
SECTION 2: SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
2.1 TECHNICAL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
2.2 EXTERNAL CONNECTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
2.3 CONTACT DATA - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-2
2.4 MEASUREMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-2
2.5 MEASUREMENT UNITS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-2
2.6 SETTING RANGES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-3
2.7 GROUND/ PHASE OVERCURRENTS AND UNDERVOLTAGE UNITS - - - - - - - - - - - - - 2-3
TABLE OFCONTENTS
Section Descripton Page No.

I.L. 40-385.7
xi
2.8 OPTIONAL SINGLE-POLE-TRIP LOGIC AND OUTPUTS
(Without Programmable Contact Option) 2-4
2.9 OPTIONAL PROGRAMMABLE OUTPUT CONTACTS
(Without Single-pole Trip Option) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-4
2.10 OUT-OF-STEP BLOCK - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-4
2.11 SELECTABLE PHASE SEQUENCE ABC OR ACB ROTATION - - - - - - - - - - - - - - - - 2-5
2.12 OPTIONAL COMMUNICATION INTERFACE - - - - - - - - - - - - - - - - - - - - - - - - - 2-5
2.13 CHASSIS DIMENSIONS AND WEIGHT - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-5
2.14 ENVIRONMENTAL DATA - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-5
SECTION 3: APPLICATIONS AND ORDERING INFORMATION - - - - - - - - - - - - - 3-1
3.1 NON-PILOT SYSTEM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1
3.2 LINE MEASUREMENT TECHNIQUES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1
3.2.1 Single-Phase-to-Ground - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-2
3.2.2 Three-Phase - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-3
3.2.3 Phase-to-Phase - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-3
3.3 MEASUREMENT ZONES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-3
3.3.1 Zone 1 Trip - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-3
3.3.2 Zone 2 Trip - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-4
3.3.3 Zone 3 Trip - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-5
3.3.4 Zone 1 Extension - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-5
3.4 REL300 NON-PILOT FEATURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-5
3.4.1 3-Zone Distance Phase and Ground Relay with
Reversible Zone 3 Phase and Ground - - - - - - - - - - - - - - - - - - - - - - - - 3-6
3.4.2 Directional or Non-Directional Inverse Time
Overcurrent Ground Backup Unit - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-6
3.4.3 Loss of Potential Supervision (LOP) - - - - - - - - - - - - - - - - - - - - - - - - - 3-7
3.4.4 Loss of Current Monitoring (LOI) - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-8
3.4.5 Overcurrent Supervision - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-8
3.4.6 Instantaneous Forward Directional Overcurrent
Trip/Highset Trip Logic 3-8
3.4.7 Close-Into-Fault Trip (CIFT) and Stub-Bus Protection (SBP) Logic - - - - - - - - - - 3-8
3.4.8 Unequal-Pole-Closing Load Pickup Logic - - - - - - - - - - - - - - - - - - - - - - -3-10
3.4.9 Selectable Loss-of-Load Accelerated Trip Logic (LLT) - - - - - - - - - - - - - - - -3-10

I.L. 40-385.7
xii
3.4.10 Current or Voltage Change Fault Detector (∆I, ∆V) and GS - - - - - - - - - - - - - -3-10
3.4.11 Selectable Ground Directional Unit (ZSEQ/NSEQ/DUAL) - - - - - - - - - - - - - - -3-11
3.4.12 Instantaneous Forward Directional Overcurrent Unit (FDOG)
and Phase Unit (FDOP) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-11
3.4.13 Instantaneous Reverse Directional Overcurrent Ground
Function (RDOG) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-12
3.4.14 Programmable Reclosing Initiation and Reclose Block - - - - - - - - - - - - - - - -3-12
3.4.15 Output Contact and Opto-Input Tests - - - - - - - - - - - - - - - - - - - - - - - - -3-13
3.4.16 Sixteen Fault Data - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-13
3.4.17 Out-of-Step Block (OSB) Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-13
3.4.17.1 Security Logic for Subsequent Out-of-Step (OS) Condition - - - - - - - -3-14
3.4.18 Optional Single-Pole-Trip (SPT) Logic and Outputs
Without Programmable Contact Option - - - - - - - - - - - - - - - - - - - - - - - -3-14
3.4.19 Oscillographic Data - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-14
3.5 PILOT SYSTEM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-15
3.5.1 Permissive Overreach Transfer Trip (POTT)/Simplified Unblocking - - - - - - - - - -3-15
3.5.2 Permissive Underreach Transfer Trip (PUTT) - - - - - - - - - - - - - - - - - - - - -3-18
3.5.3 Directional Comparison Blocking Scheme (BLK) - - - - - - - - - - - - - - - - - - -3-19
3.5.4 High Resistance Ground Faults - Pilot Supplement - - - - - - - - - - - - - - - - - -3-21
3.5.5 Power Reversal on POTT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-21
3.6 3-ZONE DISTANCE PHASE AND GROUND WITH
INDEPENDENT PILOT PHASE AND GROUND - - - - - - - - - - - - - - - - - - - - - - - -3-22
3.7 INVERSE TIME DIRECTIONAL OR NON-DIRECTIONAL
(SELECTABLE) OVERCURRENT GROUND BACKUP - - - - - - - - - - - - - - - - - - - -3-22
3.8 INSTANTANEOUS REVERSE DIRECTIONAL
OVERCURRENT GROUND FUNCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-22
3.8.1 Supplement to Reverse Z3G Trip - - - - - - - - - - - - - - - - - - - - - - - - - -3-22
3.8.2 Carrier Ground Start on Blocking Scheme - - - - - - - - - - - - - - - - - - - - - -3-22
3.8.3 Weakfeed System Application - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-22
3.9 LOSS-OF-POTENTIAL SUPERVISION - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.10 LOSS-OF-CURRENT MONITORING - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.11 OVERCURRENT SUPERVISION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.12 INSTANTANEOUS OVERCURRENT TRIP - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.13 HIGH-SET INSTANTANEOUS DIRECT TRIP,
INCLUDING THREE-PHASE AND ONE GROUND
OVERCURRENT UNITS FOR SPT/3PT APPLICATION - - - - - - - - - - - - - - - - - - - -3-23

I.L. 40-385.7
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3.14 CLOSE-INTO-FAULT TRIP AND STUB BUS PROTECTION - - - - - - - - - - - - - - - - - -3-23
3.15 UNEQUAL-POLE CLOSING LOAD PICKUP LOGIC - - - - - - - - - - - - - - - - - - - - - -3-23
3.16 SELECTABLE LOSS-OF-LOAD ACCELERATED TRIP LOGIC (LLT) - - - - - - - - - - - - -3-23
3.17 CURRENT CHANGE FAULT DETECTOR - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.18 VOLTAGE CHANGE FAULT DETECTOR - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.19 3-TERMINAL LINE APPLICATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-23
3.20 WEAKFEED TRIP APPLICATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-24
3.21 LOGIC FOR RB ON BF SQUELCH (Setting BFRB) - - - - - - - - - - - - - - - - - - - - - -3-25
3.22 OUT-OF-STEP (OS) LOGIC - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-25
3.23 OPTIONAL SINGLE-POLE TRIP (SPT) LOGIC AND OUTPUTS Without
Programmable Output Contact Option - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-25
3.24 OPTIONAL PROGRAMMABLE OUTPUT CONTACTS
WITHOUT SPT OPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-25
3.25 REL300 Ordering Information - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-26
SECTION 4: INSTALLATION, OPERATION AND MAINTENANCE - - - - - - - - - - - - 4-1
4.1 SEPARATING THE INNER AND OUTERCHASSIS - - - - - - - - - - - - - - - - - - - - - - 4-1
4.2 TEST PLUGS AND FT-14 SWITCHES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-2
4.3 EXTERNAL WIRING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-2
4.4 REL300 FRONT PANEL DISPLAY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
4.4.1 Vacuum Fluorescent Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
4.4.2 LED Indicators - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
4.4.3 Pushbutton Switches - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
4.4.4 Test Points - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-4
4.5 FRONT PANEL OPERATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-4
4.5.1 Settings Mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-4
4.5.2 Metering (Volts/Amps/Angle) Mode - - - - - - - - - - - - - - - - - - - - - - - - - - 4-5
4.5.3 Target (Last and Previous Fault) Mode - - - - - - - - - - - - - - - - - - - - - - - - 4-5
4.5.4 Test Mode (Self-Check Routine) - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-6
4.6 JUMPER CONTROLS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-7
4.6.1 Backplane Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-7
4.6.2 Interconnect Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-7
4.6.3 Microprocessor Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-7
4.6.4 Power Supply Module - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-8

I.L. 40-385.7
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4.6.5 Programmable Output Contact Module - - - - - - - - - - - - - - - - - - - - - - - - 4-8
4.7 COMMUNICATION INTERFACE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-8
4.7.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-8
4.7.2 Communication Port Options - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-9
4.7.3 Connecting Cables - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-9
4.8 SIXTEEN FAULT TARGET DATA - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-10
4.9 OSCILLOGRAPHIC DATA (Standard) (Optional Graphic Feature) - - - - - - - - - - - - - -4-10
4.10 PROGRAMMABLE CONTACT OUTPUTS (Optional Feature) - - - - - - - - - - - - - - - - -4-10
4.11 ROUTINE VISUAL INSPECTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-11
4.12 ACCEPTANCE TESTING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-11
4.13 NORMAL PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-11
4.14 DISASSEMBLY PROCEDURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-11
SECTION 5: SETTING CALCULATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
5.1 CALCULATION OF REL300 SETTINGS - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
5.1.1 Ratio of Zero and Positive Sequence Impedances- - - - - - - - - - - - - - - - - - - 5-1
5.1.2 Zone 1 Distance Unit Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-2
5.1.3 Zone 2 and Pilot Distance Unit Settings - - - - - - - - - - - - - - - - - - - - - - - 5-2
5.1.4 Zone 3 Distance Unit Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-2
5.1.5 Overcurrent Unit Setting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-2
5.1.6 OSB Blinder Settings (RT and RU) - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3
5.1.7 Overcurrent Ground Backup Unit (GB) - - - - - - - - - - - - - - - - - - - - - - - - 5-5
5.1.8 Timer Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-7
5.2 SELECTION OF REL300 SETTINGS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-7
5.2.1 The OSC setting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.2 The FDAT setting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.3 The current transformer ratio setting (CTR) - - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.4 The voltage transformer ratio setting (VTR) - - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.5 The frequency setting (FREQ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.6 The current transformer type setting (CTYP) - - - - - - - - - - - - - - - - - - - - - 5-8
5.2.7 The read primary setting (RP) - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.8 Ohms per unit distance of the line primary reactance setting (XPUD) - - - - - - - - - 5-9
5.2.9 The setting of DTYP (distance type DKM &DMI) - - - - - - - - - - - - - - - - - - - 5-9
5.2.10 The setting of TTYP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9

I.L. 40-385.7
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5.2.11 For an SPT application - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.12 The settings of PTRI, Z1RI, Z2RI and Z3RI - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.13 For a pilot system, set BFRB - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.14 The setting of PLT (pilot) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.15 The STYP (system type) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9
5.2.16 For the pilot REL300 only - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.17 For permissive pilot REL300 only - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.18 For application of POTT/BLK systems - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.19 The FDGT (FDOG trip delay timer) - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.20 Distance/overcurrent units- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.21 Set T1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.22 The T2P, T2G, T3P and/or T3G timer functions - - - - - - - - - - - - - - - - - - - 5-10
5.2.23 The Zone 3 distance units (Z3P and Z3G) - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.24 Set the positive sequence impedance angle (PANG) - - - - - - - - - - - - - - - - 5-10
5.2.25 Set the zero sequence impedance angle (GANG) - - - - - - - - - - - - - - - - - - 5-10
5.2.26 Set the ZR - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.27 The LV units - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10
5.2.28 The polarizing approach for DIRU - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.29 Set GDIR - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.30 Set Close-Into-Fault (CIF) and stub-bus protection functions - - - - - - - - - - - - - 5-11
5.2.31 Set LLT (Load-Loss Trip) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.32 Set LOPB to "DIST"- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.33 Set LOIB - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.34 Set AL2S - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.35 Set the SETR- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.2.36 Procedure to set the real-time clock - - - - - - - - - - - - - - - - - - - - - - - - - 5-11
5.3 GUIDANCE FOR RECLOSING INITIATION MODE PROGRAMMING - - - - - - - - - - - - - 5-12
5.3.1 For system without SPT system - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-12
5.3.2 For system with SPT system - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-12
5.4 SELECTION OF PROGRAMMABLE CONTACTS - - - - - - - - - - - - - - - - - - - - - - 5-12
APPENDICES
AFULL PERFORMANCE TESTS ........................................................A-1
BACCEPTANCE/MAINTENANCE TESTS...................................................B-1
REL300 V2.71 INDEX TO NOMENCLATURE ..........................................INDEX-1
SYSTEM DIAGRAMS..............................................................SD-1

I.L. 40-385.7
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FIGURES
DESCRIPTION OF FIGURE FIGURENO.PAGE NO.
REL300 Relay Assembly (without FT-14 Switches) (photo) - - - - - - - - - 1-1 - - - - - - - - - - - - 1-9
Layout of REL300 Modules within Inner and Outer Chassis - - - - - - - - - 1-2 - - - - - - - - - - - -1-10
INCOM/PONI Communication Interface Device (photo) - - - - - - - - - - - 1-3 - - - - - - - - - - - -1-11
Simplified Block Diagram of REL300 Relay - - - - - - - - - - - - - - - - - 1-4 - - - - - - - - - - - -1-12
REL300 Relay Program Functions - - - - - - - - - - - - - - - - - - - - - 1-5 - - - - - - - - - - - -1-13
CO-2 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-1 - - - - - - - - - - - - 2-6
CO-5 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-2 - - - - - - - - - - - - 2-7
CO-6 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-3 - - - - - - - - - - - - 2-8
CO-7 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-4 - - - - - - - - - - - - 2-9
CO-8 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-5 - - - - - - - - - - - -2-10
CO-9 Curve Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - 2-6 - - - - - - - - - - - -2-11
CO-11 Curve Characteristics - - - - - - - - - - - - - - - - - - - - - - - - 2-7 - - - - - - - - - - - -2-12
REL300 Outline Drawing - - - - - - - - - - - - - - - - - - - - - - - - - - 2-8 - - - - - - - - - - - -2-13
REL300 Backplane Drawing (Rear View) - - - - - - - - - - - - - - - - - - 2-9 - - - - - - - - - - - -2-14
REL300 Characteristics/R-X Diagram- - - - - - - - - - - - - - - - - - - - 3-1 - - - - - - - - - - - -3-27
Mho Characteristic for Phase-to-Ground Faults - - - - - - - - - - - - - - - 3-2 - - - - - - - - - - - -3-28
Mho Characteristics for Three-Phase Faults (No Load Flow)- - - - - - - - - 3-3 - - - - - - - - - - - -3-29
Mho Characteristics for Phase-to-Phase and Two-Phase-to-Ground
Faults (No Load Flow) - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-4 - - - - - - - - - - - -3-29
REL300 Zone-1 Trip Logic - - - - - - - - - - - - - - - - - - - - - - - - - 3-5 - - - - - - - - - - - -3-30
REL300 Zone-2 Trip Logic - - - - - - - - - - - - - - - - - - - - - - - - - 3-6 - - - - - - - - - - - -3-31
REL300 Zone-3 Trip Logic - - - - - - - - - - - - - - - - - - - - - - - - - 3-7 - - - - - - - - - - - -3-32
REL300 Zone-1 Extension Scheme- - - - - - - - - - - - - - - - - - - - - 3-8 - - - - - - - - - - - -3-33
Inverse Time Overcurrent Ground Backup Logic - - - - - - - - - - - - - - 3-9 - - - - - - - - - - - -3-33
Loss of Potential Logic - - - - - - - - - - - - - - - - - - - - - - - - - - -3-10 - - - - - - - - - - - -3-34
Loss of Potential Logic (System Diagram)- - - - - - - - - - - - - - - - - -3-11 - - - - - - - - - - - -3-35
AC Current Monitoring Logic - - - - - - - - - - - - - - - - - - - - - - - -3-12 - - - - - - - - - - - -3-35
Overcurrent Supervision - - - - - - - - - - - - - - - - - - - - - - - - - -3-13 - - - - - - - - - - - -3-36
Instantaneous Overcurrent Highset Trip Logic- - - - - - - - - - - - - - - -3-14 - - - - - - - - - - - -3-36
REL300 Close-Into-Fault Trip (CIFT) Logic and Stub Bus
Protection Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-15a - - - - - - - - - - - -3-37
Special Application for CIF Logic with LV Time Delay Pickup - - - - - - - 3-15b - - - - - - - - - - - -3-37
REL300 Unequal-Pole-Closing Load Pickup Trip Logic - - - - - - - - - - -3-16 - - - - - - - - - - - -3-38
Load Loss Accelerated Trip Logic- - - - - - - - - - - - - - - - - - - - - -3-17 - - - - - - - - - - - -3-39
Out-of-Step Block Logic - - - - - - - - - - - - - - - - - - - - - - - - - 3-18a - - - - - - - - - - - -3-40
Out-of-Step Block Logic (Blinder Characteristics) - - - - - - - - - - - - - 3-18b - - - - - - - - - - - -3-40
Reclosing Initiation Logic - - - - - - - - - - - - - - - - - - - - - - - - - -3-19 - - - - - - - - - - - -3-41
Single Pole Trip Logic - - - - - - - - - - - - - - - - - - - - - - - - - - -3-20 - - - - - - - - - - - -3-42
Pilot Trip Relay- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-21 - - - - - - - - - - - -3-42

I.L. 40-385.7
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POTT/Unblocking Pilot Trip Logic - - - - - - - - - - - - - - - - - - - - - -3-22 - - - - - - - - - - - -3-43
Carrier Keying/Receiving Logic in POTT/Unblocking schemes - - - - - - - -3-23 - - - - - - - - - - - -3-43
PUTT Keying Logic- - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-24 - - - - - - - - - - - -3-44
Blocking System Logic - - - - - - - - - - - - - - - - - - - - - - - - - - -3-25 - - - - - - - - - - - -3-45
PLTG supplemented by FDOG - - - - - - - - - - - - - - - - - - - - - - -3-26 - - - - - - - - - - - -3-46
Power Reversed on POTT/Unblocking Schemes - - - - - - - - - - - - - -3-27 - - - - - - - - - - - -3-46
Unequal Pole Closing on Fault - - - - - - - - - - - - - - - - - - - - - - -3-28 - - - - - - - - - - - -3-47
Additional Logic for POTT/Unblocking Schemes on 3-Terminal
Line Application - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-29 - - - - - - - - - - - -3-47
Additional Logic for PUTT Scheme on 3-Terminal Line Application- - - - - -3-30 - - - - - - - - - - - -3-48
Weakfeed Application - - - - - - - - - - - - - - - - - - - - - - - - - - -3-31 - - - - - - - - - - - -3-49
Reversible Zone 3 Phase and Ground (Reverse Block Logic) - - - - - - - -3-32 - - - - - - - - - - - -3-49
Composited Signal for Programmable Output Contacts - - - - - - - - - - -3-33 - - - - - - - - - - - -3-50
REL300 Backplane - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1 - - - - - - - - - - - -4-13
REL300 Backplane PC Board Terminal - - - - - - - - - - - - - - - - - - - 4-2 - - - - - - - - - - - -4-14
REL300 Systems External Connection - - - - - - - - - - - - - - - - - - - 4-3 - - - - - - - - - - - -4-15
Test Connection for Single-Phase-to-Ground Faults (sheet 1 of 4) - - - - - - B-1 - - - - - - - - - - - - B-6
Test Connection for Three-Phase Faults (sheet 2 of 4) - - - - - - - - - - - B-2 - - - - - - - - - - - - B-7
Test Connection for Phase-to-Phase Faults (sheet 3 of 4) - - - - - - - - - - B-3 - - - - - - - - - - - - B-8
Test Connection for Dual Polarizing Ground Directional Unit (sheet 4 of 4)- - B-4 - - - - - - - - - - - - B-9
REL300 with Out-of-Step Block Option - - - - - - - - - - - - - - - - - - - B-5 - - - - - - - - - - - B-10
REL300 Block Diagram- - - - - - - - - - - - - - - - - - - - - - - - - - SD-1 - - - - - - - - - - - SD-2
REL300 System Logic Diagram (sheet 1 of 3)- - - - - - - - - - - - - - - SD-2 - - - - - - - - - - - SD-3
REL300 System Logic Diagram (sheet 2 of 3)- - - - - - - - - - - - - - - SD-3 - - - - - - - - - - - SD-4
REL300 System Logic Diagram (sheet 3 of 3)- - - - - - - - - - - - - - - SD-4 - - - - - - - - - - - SD-5
DESCRIPTION OF FIGURE FIGURENO.PAGE NO.

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TABLES
DESCRIPTION OF TABLE TABLE NO.PAGE NO.
REL300 CATALOG NUMBERS-----------------------3-1--------------3-51
REL300 ACCESSORIES -------------------------3-2--------------3-52
SINGLE-POLE-TRIP OPERATING MODES ------------------3-3--------------3-52
REL300 PROGRAMMABLE OUTPUT CONTACTS---------------3-4--------------3-53
SETTING DISPLAY ----------------------------4-1--------------4-16
METERING DISPLAY ---------------------------4-2--------------4-19
TARGET (FAULT DATA)DISPLAY ---------------------4-3--------------4-20
RECOMMENDED JUMPER POSITIONS (V2.2X) ---------------4-4--------------4-22
OUTPUT CONTACT SELECTION ----------------------4-5--------------4-23
COMMUNICATIONS CABLE REQUIREMENTS -----------------4-6--------------4-24
DIP SWITCH SETTING CHART -----------------------4-7--------------4-24
CURRENT TRANSFORMER SETTINGS--------------------5-1--------------5-12
RECLOSING INITIATION MODE PROGRAMMING ---------------5-2--------------5-13
TRIP TIME CONSTANTS FOR CURVES -------------------5-3--------------5-13
PRESENT REL300 SETTINGS (PILOT SYSTEM)---------------A-1------------- A-27
TRIP TIME CONSTANTS FOR CO CURVES -----------------A-2------------- A-27
FAULT TYPES APPLIED TO REL300 --------------------A-3------------- A-28

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Section 1. PRODUCT DESCRIPTION
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.

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1.3 REL300 MODULES
The inner and outer chassis, together, contain 6 standard modules, plus the option module for
single pole trip applications (see Figure 1-2). The Backplate is connected to the Backplane
module (outer chassis). The remaining modules are attached to the inner chassis:
• Interconnect module
• Option module or Contact module
• Filter module
• Microprocessor module
• Display module
• Power Supply module
Circuit descriptions for each module, may be found in Appendices A thru G, in accordance with
the list in the Preface to this document (see “Contents of Relay System”).
1.3.1 Backplane Module
The Backplane Assembly includes three voltage transformers, four current transformers, two
filter chokes and several surge protection capacitors.
The Backplane Module (see Appendix A) receives all external connections (with or without the
FT-14 switch option), and connects directly to the Interconnect module, thru plug-in connectors
(J11, J12, J13) which provide the connection between outer and inner chassis.
The female parts of the connectors are mounted on the Backplane module, which is part of the
outer chassis. The male parts of the connectors are mounted on the Interconnect module,
which is part of the inner chassis.
The INCOM®or RS232 PONI1(see Figure 1-3) is mounted on the Backplate of the outer chas-
sis and is connected to the Backplane module.
1.3.2 Interconnect Module
The Interconnect module (see Appendix B) becomes the floor of the REL300 inner chassis; it
provides electrical connections from and to all other modules: from the Backplane (at the rear),
to the Filter and Power Supply modules (at left and right, respectively), and to the Microproces-
sor and Display modules at the front of the inner chassis.
The Interconnect module receives inputs VAN, VBN, VCN, IA, IB, IC, IPfrom the Backplane mod-
ule and feeds them to the Filter module. The IPinput is used for zero-sequence dual-polarizing
ground current measurement; the input is from the power transformer neutral ct. Also, seven
opto-couplers, on the Interconnect module, send the following signals to the Microprocessor
module:
• External Reset - resets the target display.
• 52b - used for close-into-fault (CIF) detection, load loss trip (LLT) and carrier-start and stop
control in a pilot system.
1. “INCOM “stands for INtegrated COMmunications. The “
PONI ” acronym stands for Product Operated Network Interface.

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• 52a (for single-pole trip option; i.e., for pole disagreement).
• Pilot Enable - should be “ON” for the pilot system option.
• Receiver #1 (for Pilot option) - carrier receiver for two terminal application.
• Receiver #2 (for Pilot option) - second carrier receiver for three-terminal application.
• SBP (89b) for stub bus protection.
1.3.3 Option Module/Contact Module
For single-pole tripping applications, an Option module (see Appendix C) is added with extra
tripping and reed relays. The Option module plugs into the Interconnect module.
For 3-pole tripping application, an optional Contact module can be plugged into the connector
and provide 8 additional programmable output contacts.
1.3.4 Filter Module
The Filter module (see Appendix D) band-limits the seven inputs from the Interconnect module:
VAN, VBN, VCN, IA, IB, IC, IP. These inputs are fed to the Microprocessor module (analog signal
multiplexer).
1.3.5 Microprocessor Module
The Microprocessor module (see Appendix E) includes the following subsystems:
•Microprocessor - Intel 80C196, a 16-bit microcontroller operating with a 10 MHz clock.
•EPROM - Program memory in separate, easily-replaced EPROM chips.
•PROM - Programmable read-only memory.
•RAM - Volatile read-write memory, for working storage.
•NOVRAM (EEPROM) - Non-volatile memory for storing settings and fault-data targets when
the REL300 relay is deenergized.
•A/D Converter - The seven inputs from the filter module are analog-multiplexed to a single
sample/hold circuit. The output of the sample/hold is fed to the Analog-to-Digital Converter
through an auto-ranging circuit which shifts gain by a factor of eight.
•Digital I/O Circuitry - Status inputs from breaker auxiliary contacts (52a and 52b), and Ex-
ternal Reset signal are interfaced to the microprocessor via optical isolators (Figure 4-2). The
microprocessor executes control outputs using dry contacts. Output relays (Figure 4-2) are
used for breaker tripping, breaker failure initiation (BFI), reclose initiation (RI), and reclose
blocking (RB). GS (AL-3) contact is provided for LOP/LOI alarm. Trip and relay-failure alarm
contacts are included. Reed relays in the trip circuits sense trip coil current flow and feedback
target information to the microprocessor.
For the option of Contact module, eight additional output contacts are provided and can be pro-
grammed from 30 functions shown in Table 3-4.
NOTE: JMP3 should be “OUT” for normal ABC rotation. Insert a jumper into JMP3 position for
ACB phase rotation system application.