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2.6
SEL-787 Relay
Instruction Manual
Date Code 20081022
Installation
I/O Configuration
Current/Voltage Card
(1 ACI/3 AVI or 1 ACI)
Supported in Slot
E
only, order this card option when you have either single-
or three-phase (wye or delta) PTs and/or neutral ac current input (1 A or 5 A
nominal). With this card installed, the SEL-787 tracks the frequency (using
positive-sequence voltage) and samples at 16 times a cycle—
see Processing
for more information. The pin connections remain
the same for the 1 ACI card, which only supports the neutral current input.
Analog Input/Output
Card (4 AI/4 AO)
Supported in any one of the nonbase unit slots (Slot
C, D,
or
E
), this card has
four analog inputs (AI) and four analog outputs (
AO
shows the
terminal allocation.
I/O Input Card
(3 DI/4 DO/1 AO)
Supported in one nonbase unit slot (Slot
C
,
D
, or
E
), this card has three digital
inputs, four digital outputs, and one analog output.
shows the
terminal allocation.
Table 2.4
Current/Voltage Card Terminal Allocation
Terminal Number
Designator
Description
01
VA
Phase A voltage input
02
VB
Phase B voltage input
03
VC
Phase C voltage input
04
N
Return for VA, VB, VC
09, 10
IN1
Neutral current input 1
NOTE:
The relay tracks the
frequency if 3V1 is greater than 0.75 V.
Table 2.5
Four Analog Input/Four Analog Output (4 AI/4 AO) Card Terminal
Allocation
Terminal Number
Software Reference, Description
a
a
x = 3, 4, or 5 (e.g., AI401, AI402, etc., if the card was installed in Slot D).
01, 02
AO
x
01, Analog Output number
x
01
03, 04
AO
x
02, Analog Output number
x
02
05, 06
AO
x
03, Analog Output number
x
03
07, 08
AO
x
04, Analog Output number
x
04
09, 10
AI
x
01, Transducer Input number
x
01
11, 12
AI
x
02, Transducer Input number
x
02
13, 14
AI
x
03, Transducer Input number
x
03
15, 16
AI
x
04, Transducer Input number
x
04
Table 2.6
I/O (3 DI/4 DO/1 AO) Card Terminal Allocation
Terminal Number
Software Reference, Description
a
a
x = 3, 4, or 5 (e.g., OUT401, OUT402, etc., if the card was installed in Slot D).
01, 02
OUT
x
01, driven by OUT
x
01 SEL
OGIC
equation
03, 04
OUT
x
02, driven by OUT
x
02 SEL
OGIC
equation
05, 06
OUT
x
03, driven by OUT
x
03 SEL
OGIC
equation
07, 08
OUT
x
04, driven by OUT
x
04 SEL
OGIC
equation
09, 10
AO
x
01, Analog Output Number 1
11, 12
IN
x
01, drives IN
x
01 element
13, 14
IN
x
02, drives IN
x
02 element
15, 16
IN
x
03, drives IN
x
03 element
Содержание SEL-787
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