1.9
Date Code 20081022 Instruction Manual SEL-787 Relay
Introduction and Specifications
Specifications
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for
thermal dissipation):
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
NOTE: Per IEC 60255-23:1994, using the simplified method of
assessment.
NOTE: Make rating per IEEE C37.90-1989.
Optoisolated Control Inputs
When Used With DC Control Signals
250 V:
ON for 200–275 Vdc
OFF below 150 Vdc
220 V:
ON for 176–242 Vdc
OFF below 132 Vdc
125 V:
ON for 100–135.5 Vdc
OFF below 75 Vdc
110 V:
ON for 88–121 Vdc
OFF below 66 Vdc
48 V:
ON for 38.4–52.8 Vdc
OFF below 28.8 Vdc
24 V:
ON for 15–30 Vdc
OFF for <5 Vdc
When Used With AC Control Signals
250 V:
ON for 170.6–300 Vac
OFF below 106 Vac
220 V:
ON for 150.2–264 Vac
OFF below 93.3 Vac
125 V:
ON for 85–150 Vac
OFF below 53 Vac
110 V:
ON for 75.1–132 Vac
OFF below 46.6 Vac
48 V:
ON for 32.8–60 Vac
OFF below 20.3 Vac
24 V:
ON for 14–27 Vac
OFF below 5 Vac
Current draw at
nominal dc voltage:
2 mA (at 220–250 V)
4 mA (at 48–125 V)
10 mA (at 24 V)
Rated Impulse Withstand
Voltage (U
imp
): 4000 V
Analog Output (Optional)
1A0 4A0
Current: 4–20 mA ±20 mA
Voltage: — ±10 V
Load at 1 mA: — 0–15 kΩ
Load at 20 mA: 0–300 Ω 0–750 Ω
Load at 10 V: — >2000 Ω
Refresh Rate: 100 ms
Error: < ±0.55%, Full Scale, at 25°C
Select From: Analog quantities available in the relay
Analog Inputs (Optional)
Maximum Input Range: ±20 mA
±10 V
Operational range set by user
Input Impedance: 200 Ω (current mode)
>10 kΩ (voltage mode)
Accuracy at 25°C:
With user calibration:
0.050% of ±20 mA (current mode)
0.025% of ±10 V (voltage mode)
Without user
calibration:
0.050% of ±20 mA (current mode)
0.25% of ±10 V (voltage mode)
Accuracy Variation With
Temperature:
±0.015% per °C of full-scale
(±20 mA or ±10 V)
Frequency and Phase Rotation
System Frequency: 50, 60 Hz
Phase Rotation: ABC, ACB
Frequency Tracking: 20–70 Hz (requires ac voltage inputs
option)
Time-Code Input
Format: Demodulated IRIG-B
On (1) State: V
ih
≥ 2.2 V
Off (0) State: V
il
≤ 0.8 V
Input Impedance: 2 kΩ
Accuracy: Relay time is synchronized to within ±5
ms of time-source input
Communications Ports
Standard EIA-232 (2 ports)
Location:
Front Panel
Rear Panel
Data Speed: 300–38400 bps
EIA-485 Port (optional)
Location: Rear Panel
Data Speed: 300–19200 bps
Ethernet Port (optional)
Single/Dual 10/100BASE-T copper (RJ-45 connector)
Single/Dual 100BASE-FX (LC connector)
Standard Multimode Fiber-Optic Port
Laser/LED:
Class 1 LED
Complies with IEC 60825-1:1993
+ A1:1997 + A2:2001
Optional Communications Cards
Option 1: EIA-232 or EIA-485 communications card
Option 2: DeviceNet communications card
Communications Protocols
SEL, Modbus, DNP, FTP, TCP/IP, Telnet, IEC 61850, MIRRORED
B
ITS, EVMSG, C37.118 (synchrophasers), and DeviceNet. See
Table 7 .3 for details.
Operating Temperature
IEC Performance Rating: –40° to +85°C (–40° to +185°F)
(per IEC/EN 60068-2-1 & 60068-2-2)
UL/CSA Safety Rating: +70°C (158°F) maximum
DeviceNet
Communications
Card Rating: +60°C (140°F) maximum
Operating Environment
Pollution Degree: 2
Overvoltage Category: II
Atmospheric Pressure: 80–110 kPa
Relative Humidity: 5–95%, noncondensing
Maximum Altitude: 2000 m
Dimensions
144.0 mm (5.67 in.) x 192.0 mm (7.56 in.) x 147.4 mm (5.80 in.)
Weight
2.0 kg (4.4 lbs)
Terminal Connections
Current Inputs Terminal Block Tightening Torque
Minimum:
0.9 Nm (8 in-lb)
Maximum:
1.4 Nm (12 in-lb)
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