Product Standards - Schweitzer Engineering Laboratories SEL-787-2 Manual

Transformer protection relays

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Table Of Contents

Table of Contents

Frequency and Phase Rotation

System Frequency:

50, 60 Hz

Phase Rotation:

ABC, ACB

Frequency Tracking:

15–70 Hz (requires ac voltage inputs)

Time-Code Input

Format:

Demodulated IRIG-B

On (1) State:

0.8 V

Off (0) State:

Input Impedance:

2 k

Synchronization Accuracy

Internal Clock:

±1 µs

Synchrophasor Reports

(e.g., MET PM):

±10 µs

All Other Reports:

±5 ms

SNTP Accuracy:

±2 ms

PTP Accuracy:

±1 ms

Unsynchronized Clock

Drift Relay Powered:

2 minutes per year, typically

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 (RJ45 connector)

Single/Dual 100BASE-FX (LC connector)

Standard Multimode Fiber-Optic Port

Location:

Front Panel

Data Speed:

300–38400 bps

Fiber-Optic Ports Characteristics

PORT 1 (or 1A, 1B) Ethernet

Wavelength:

1300 nm

Optical Connector Type:

Fiber Type:

Multimode

Link Budget:

16.1 dB

Typical TX Power:

–15.7 dBm

RX Min. Sensitivity:

–31.8 dBm

Fiber Size:

62.5/125 µm

Approximate Range:

~6.4 km

Data Rate:

100 Mbps

Typical Fiber Attenuation: –2 dB/km

PORT 2 Serial (SEL-2812 Compatible)

Wavelength:

820 nm

Optical Connector Type:

Fiber Type:

Multimode

Link Budget:

8 dB

Typical TX Power:

–16 dBm

RX Min. Sensitivity:

–24 dBm

Fiber Size:

62.5/125 µm

Approximate Range:

~1 km

Data Rate:

5 Mbps

Typical Fiber Attenuation: –4 dB/km

SEL-787-2, -3, -4 Data Sheet

2.2 V

Optional Communications Cards

Option 1:

EIA-232 or EIA-485 communications

card

Option 2:

DeviceNet communications card

Communications Protocols

SEL, Modbus RTU and TCP/IP, DNP3 serial and LAN/WAN, FTP,

Telnet, SNTP, IEEE 1588-2008 firmware-based PTP, IEC 61850

Edition 2, IEC 60870-5-103, EtherNet/IP, PRP, M

Communications, EVMSG, IEEE C37.118 (synchrophasors), and

DeviceNet

Operating Temperature

IEC Performance Rating:

–40 to +85C (–40 to +185F)

(per IEC/EN 60068-2-1 and 60068-2-2)

Note: Not applicable to UL applications.

Note: The front-panel display is impaired for temperatures below

–20°C and above +70°C.

DeviceNet

Communications

Card Rating:

+60°C (140°F) maximum

Optoisolated Control

As many as 26 inputs are allowed in

Inputs:

ambient temperatures of 85°C or less.

As many as 34 inputs are allowed in

ambient temperatures of 75°C or less.

As many as 44 inputs are allowed in

ambient temperatures of 65°C or less.

Operating Environment

Insulation Class:

Pollution Degree:

Overvoltage Category:

Atmospheric Pressure:

80–110 kPa

Relative Humidity:

5%–95%, noncondensing

Maximum Altitude Without

Derating (Consult the

Factory for Higher

Altitude Rating):

2000 m

Dimensions

144.0 mm (5.67 in) x 192.0 mm (7.56 in) x 147.4 mm (5.80 in)

Weight

2.7 kg (6.0 lb)

Relay Mounting Screws (#8–32) Tightening Torque

Minimum:

1.4 Nm (12 in-lb)

Maximum:

1.7 Nm (15 in-lb)

Terminal Connections

Terminal Block

Screw Size:

Ring Terminal Width:

0.310 in maximum

Terminal Block Tightening Torque

Minimum:

0.9 Nm (8 in-lb)

Maximum:

1.4 Nm (12 in-lb)

Compression Plug Tightening Torque

Minimum:

0.5 Nm (4.4 in-lb)

Maximum:

1.0 Nm (8.8 in-lb)

Compression Plug Mounting Ear Screw Tightening Torque

Minimum:

0.18 Nm (1.6 in-lb)

Maximum:

0.25 Nm (2.2 in-lb)