Download
Share
Print this page
Schweitzer Engineering Laboratories SEL-787-3 Manual
  1. Manuals
  2. Brands
  3. Schweitzer Engineering Laboratories Manuals
  4. Relays
  5. SEL-787-3
  6. Manual

Schweitzer Engineering Laboratories SEL-787-3 Manual

Transformer protection relay
Hide thumbs Also See for SEL-787-3:

Advertisement

Quick Links

Download this manual
SEL-787-3, -4 Transformer Protection
Relay
SEL-787-3E Model
Major Features and Benefits
The SEL-787 Transformer Protection Relay provides unsurpassed protection, integration, and control features in a
flexible, compact, and cost-effective package. The SEL-787 offers an extensive variety of protection features, depending
on the model and options selected. In this document, SEL-787 refers to all the models in Table 1. For protection func-
tions specific to a given MOT, the relay is referred to as SEL-787-4X, SEL-787-3E, or SEL-787-3S explicitly, where
needed. Model options SEL-787-4X, SEL-787-3E, and SEL-787-3S are all considered base models. Table 2 shows the
protection features available across different models.
Table 1 Current (ACI) and Voltage (AVI) Card Selection for SEL-787 Models
Model
Description/Application
787-4X
4 Winding/Terminal Current Differential
787-3E
3 Winding/Terminal Current Differential
1 Neutral Current Input
3 Voltage Inputs (Phase)
787-3S
3 Winding/Terminal Current Differential
3 Voltage Inputs (Phase)
1 Voltage Input (Vsync or Vbat)
Schweitzer Engineering Laboratories, Inc.
SEL-787-3S Model
Slot Z Card
Slot Z Inputs
(MOT Digits)
6 ACI
IAW1, IBW1, ICW1,
(81, 82, 85)
IAW2, IBW2, ICW2
6 ACI
IAW1, IBW1, ICW1,
(81, 82, 85)
IAW2, IBW2, ICW2
6 ACI
IAW1, IBW1, ICW1,
(81, 82, 85)
IAW2, IBW2, ICW2
SEL-787-4X Model
Slot E Card
Slot E Inputs
(MOT Digits)
6 ACI
IAW3, IBW3, ICW3,
(A1, A2, A5)
IAW4, IBW4, ICW4
4 ACI/3 AVI
IAW3, IBW3, ICW3,
(72, 73, 76, 77)
IN, VA, VB, VC
3 ACI/4 AVI
IAW3, IBW3, ICW3,
(71, 75)
VS/VBAT, VA, VB,
VC
SEL-787-3, -4 Data Sheet

Advertisement

loading
Need help?

Need help?

Do you have a question about the SEL-787-3 and is the answer not in the manual?

Questions and answers

Related Manuals for Schweitzer Engineering Laboratories SEL-787-3

Summary of Contents for Schweitzer Engineering Laboratories SEL-787-3

  • Page 1 SEL-787-3, -4 Transformer Protection Relay SEL-787-3E Model SEL-787-3S Model SEL-787-4X Model Major Features and Benefits The SEL-787 Transformer Protection Relay provides unsurpassed protection, integration, and control features in a flexible, compact, and cost-effective package. The SEL-787 offers an extensive variety of protection features, depending on the model and options selected.
  • Page 2 Table 3 Available Differential and REF Elements Based on the Configuration of Winding 3 Elements SEL-787-3E SEL-787-3S SEL-787-4X Differential Protection Windings (Standard) REF Elements (Standard) Differential Protection Windings (Winding 3 Configured for REF) REF Elements (Winding 3 Configured for REF) SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 3 Language Support. Choose English or Spanish for your serial ports, including the front-panel serial port. The standard relay front-panel overlay is in English; a Spanish overlay is available as an ordering option. Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 4 • I/O Expansion*--Additional Contact Inputs, Contact • M Communications Outputs, Analog Inputs, Analog Outputs, and RTD Inputs IRRORED • Single or Dual Ethernet Copper or Fiber-Optic Optional Functions Communications Port* Figure 1 SEL-787-3E Functional Diagram SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 5 • I/O Expansion*--Additional Contact Inputs, Contact • M Communications Outputs, Analog Inputs, Analog Outputs, and RTD Inputs IRRORED • Single or Dual Ethernet Copper or Fiber-Optic Optional Functions Communications Port* Figure 2 SEL-787-3S Functional Diagram Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 6 • I/O Expansion*--Additional Contact Inputs, Contact • M Communications Outputs, Analog Inputs, Analog Outputs, and RTD Inputs IRRORED • Single or Dual Ethernet Copper or Fiber-Optic Optional Functions Communications Port* Figure 3 SEL-787-4X Functional Diagram SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 7 CT saturation may occur. conditions. Set second-, fourth-, and fifth-harmonic ➤ Per-phase instantaneous overcurrent (50P) elements, thresholds independently. one element per phase, that operate on the corre- sponding phase current of Winding 3 (only available Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 8 Windings 1 and 2 and Windings 3 and 4, that operate on the calculated zero- time delay, the relay asserts and typically provides an sequence current of the corresponding combined cur- rents. SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 9 Phase-to-phase undervoltage (27PP) and overvoltage frequency. All frequency elements are disabled if the (59PP) elements that operate on the measured positive-sequence voltage is less than the minimum phase-to-phase voltages. voltage threshold. Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 10 BRKR1 LOCK application. DISABLED CLOSED/OPEN SELECTED CLOSE BRKR2 CLOSE CLOSED/OPEN SELECTED BREAKER OPEN TRIP BRKR3 CLOSED/OPEN AUX1 AUX2 Figure 8 Operator Controls (787-3S/3E Models) SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 11 C-phase of Winding 3, along with the RTD thermal month, or year) and impact of external faults on the elements, to provide fan bank control and protection. Use transformer. additional RTD thermal elements to monitor load tap Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 12 200/5 A Note: The CT secondary circuit should be grounded in the relay cabinet. Figure 9 SEL-787-4X Provides 3-Winding Transformer Differential Protection, REF Protection, Overcurrent Protection, and Fan Bank Control With LTC Monitoring SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 13 138 kV SEL-787-3E Relay 250/5 A Note: The CT secondary circuit should be grounded in the relay cabinet. Figure 10 SEL-787-3E Provides Auto-Transformer Differential Protection, REF Protection, Overcurrent Protection, and Voltage-Based Protection Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 14 Measured system frequency (Hz) FREQS Measured frequency (Hz) of synchronism-check channel V/Hz Calculated volts/hertz in percent, using highest measured voltage and frequency RTDn (n = 1 to 12) RTD temperature measurement (degrees C) SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 15 Time Automation Controller (RTAC), SEL-2032, SEL-2030, or SEL-2020 Communications Processor (via Serial Port 3 on the SEL-787). (Set Point 2) (Set Point 3) kA Interrupted Figure 12 Breaker Contact Wear Curve and Settings Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 16 Alerts can be triggered through relay events and can include measured quantities by the relay. DeviceNet Allows for connection to a DeviceNet network for access to metering data, protection elements, contact I/O, targets, and setting groups. SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 17 Each timer has independent time-delay pickup and binary data to support fast acquisition of metering or dropout settings. Program each timer input with the SER data. element you want (e.g., time qualify a current ele- Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 18 Fiber-optic Ethernet cables with LC connectors (SEL-C808) for fiber-optic Ethernet ports SEL-787 SEL-787 Set Port 1 (Ethernet) settings in each relay. Figure 15 Simple Ethernet Network Configuration With Ring Structure (Switched Mode) SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 19 Additional Ordering Options ➤ The following options can be ordered for the SEL-787 Digital I/O (4 DI/4 DO, 8 DI, 8 DO, 3 DI/4 DO/1 AO, model (see the SEL-787-3,-4 Model Option Table for 4 DI/3 DO) details). ➤ Voltage input for synchronism check/station DC bat- ➤...
  • Page 20 E01 E02 E03 E04 E11 E12 Z01 Z02 Z03 Z06 Z07 Z08 Z09 Z10 Z11 Z12 XFMR 52-3 52-1 52-2 Open Delta PT Figure 17 Wiring Diagram SEL-787-3E Transformer Protection Relay SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 21 SELECTED BRKR4 AUX 1 87-3 CLOSED/OPEN Figure 18 Front Panel With Default Configurable Labels (A) Rear-Panel Layout (B) Side-Panel Layout Figure 19 SEL-787-4X With Single Copper Ethernet, 8 DI, and RTD Option Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 22 Figure 20 Front Panel With Default Configurable Labels SEL-787-3E Rear- and Side-Panel Diagrams (A) Rear-Panel Layout (B) Side-Panel Layout Figure 21 SEL-787-3E With Dual-Fiber Ethernet, EIA-232 Communication, 3 DI/4 DO/1 AO Option SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 23 (A) Rear-Panel Diagram (B) Side-Panel Diagram Figure 22 SEL-787-3S With DeviceNet and Hybrid 4 DI/4 DO Option Relay Dimensions 7.36 (187.0) 5.47 (139.0) i9089b Figure 23 SEL-787 Dimensions for Rack- and Panel-Mount Models Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 24 240 Vac 100 ms @ 250 Vac/Vdc Insulation Voltage (U 24/48 Vdc Rating (excluding EN 61010-1): 300 Vac Rated Supply Voltage: 24–48 Vdc Contact Rating Designation: B300 Input Voltage Range: 19.2–60.0 Vdc SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 25 OFF below 66 Vdc Relay Powered: 2 minutes per year, typically 48 V: ON for 38.4–60 Vdc OFF below 28.8 Vdc 24 V: ON for 15–30 Vdc OFF for below 5 Vdc Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 26 Note: LCD contrast is impaired for temperatures below –20°C and EN 60068-2-2:2007 above +70°C 85°C, 16 hours DeviceNet Communications Card Rating: +60°C (140°F) maximum Operating Environment Pollution Degree: Overvoltage Category: Atmospheric Pressure: 80–110 kPa SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 27 0.50–16.00 A, 0.01 A steps EN 61000-4-10:1993/A1:2001 100 A/m (100 kHz and 1 MHz) 1 A models: 0.10–3.20 A, 0.01 A steps Accuracy: ±5% of setting plus ±0.02 • I secondary (steady-state pickup) Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 28 ±1% of setting plus ±0.5 V RTD Protection Pickup/Dropout Time: <1.5 cycle Setting Range: OFF, 1–250°C Time Delay: 0.00–120.00 seconds, 0.01 second steps Accuracy: ±2C Accuracy: ±0.5% plus ±0.25 cycle RTD Open-Circuit Detection: >250°C SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 29 ±2% of reading for voltages Voltage: within 24–264 V 3V2 Negative-Sequence ±2% of reading for voltages Voltage: within 24–264 V Real 3-Phase Power (kW): ±3% of reading for 0.10 < pf < 1.00 Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 30 Notes SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
  • Page 31 Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet...
  • Page 32 SEL products appearing in this document may be covered by U.S. and Foreign selinc.com • info@selinc.com patents. Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in its products, including without lim- itation software, firmware, and documentation.

This manual is also suitable for:

Sel-787-4Sel-787-3eSel-787-3sSel-787-4x