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SEL 735 Manual Guide

Introduction

The SEL 735 is a high-performance, multifunctional relay designed for protection, monitoring, and control of power systems. This guide provides a comprehensive overview of the SEL 735 manual, covering its features, operation, and application.

Table of Contents

1. Introduction to SEL 735
2. Key Features
3. Front Panel Description
4. LED Indicators
5. Pushbuttons and Switches
6. Serial Communication
7. Protection Functions
8. Monitoring and Control Functions
9. Settings and Configuration
10. Testing and Troubleshooting

1. Introduction to SEL 735

The SEL 735 is a microprocessor-based relay designed for use in power systems protection, monitoring, and control applications. It provides a comprehensive set of protection functions, including overcurrent, ground fault, and distance protection.

2. Key Features

• High-speed protection functions
• Advanced monitoring and control capabilities
• Flexible communication options (serial, Ethernet, and IEC 61850)
• Compact design with a large LCD display
• Easy-to-use interface with pushbuttons and LED indicators

3. Front Panel Description

The SEL 735 front panel features:

• A large LCD display (4 lines x 40 characters)
• 12 LED indicators for status and alarm indication
• 6 pushbuttons for menu navigation and control
• A serial communication port (RS-232 or RS-485)

4. LED Indicators

The SEL 735 features 12 LED indicators, which provide status and alarm indication:

• Power (green)
• Alarm (red)
• Warning (yellow)
• Trip (red)
• Close (green)
• Open (green)
• Overcurrent (red)
• Ground Fault (red)
• Distance (red)
• Communication (green)

5. Pushbuttons and Switches

The SEL 735 features 6 pushbuttons and 1 switch: sel 735 manual

• MENU: Enters the menu mode
• ESC: Escapes the current menu or function
• ENTER: Enters the selected menu or function
• UP/DOWN: Scrolls through menu options
• LEFT/RIGHT: Adjusts values or selects options
• RESET: Resets the relay

6. Serial Communication

The SEL 735 supports serial communication via RS-232 or RS-485:

• Supports ASCII and Modbus protocols
• Allows for remote configuration and monitoring

7. Protection Functions

The SEL 735 provides a range of protection functions:

• Overcurrent protection (phase and ground)
• Ground fault protection
• Distance protection (mho and quadrilateral characteristics)
• Trip and close commands

8. Monitoring and Control Functions

The SEL 735 provides advanced monitoring and control capabilities:

• Voltage and current monitoring
• Power quality monitoring (voltage swell, sag, and interruption)
• Control of external devices (e.g., circuit breakers)

9. Settings and Configuration

The SEL 735 can be configured using:

• Front panel pushbuttons and LCD display
• Serial communication ( ASCII and Modbus protocols)
• AcSELERATOR QuickSet software

10. Testing and Troubleshooting

The SEL 735 provides a range of testing and troubleshooting tools:

• Built-in test functions (e.g., injection tests)
• Event and fault report logs
• Oscillography and COMTRADE files

Conclusion

The SEL 735 is a powerful and versatile relay designed for protection, monitoring, and control of power systems. This guide provides a comprehensive overview of its features, operation, and application. By following this guide, users can effectively configure, operate, and maintain the SEL 735. SEL 735 Manual Guide Introduction The SEL 735

The SEL-735 Power Quality and Revenue Meter Go to product viewer dialog for this item.

is a precision measurement device from Schweitzer Engineering Laboratories (SEL) designed for high-accuracy energy billing and power quality monitoring. Official Documentation & Resources

For the most current technical data, you can access the SEL-735 Product Documentation directly from the manufacturer.

Instruction Manual: Provides comprehensive details on operation, including 4-quadrant metering and time-of-use reporting.

Quick-Start Guide: Useful for initial bench testing and basic setup.

Data Sheets: Summarizes key features like the 0.02% typical accuracy and high-resolution waveform capture.

Settings Sheets: Dedicated documents for configuring scaling, instrument transformer compensation, and logic. Key Technical Features

High Accuracy: Exceeds ANSI 0.1 and IEC 0.1 S accuracy class requirements.

Power Quality Monitoring: Measures harmonics up to the 63rd, flicker, and voltage disturbances.

Data Storage: Includes 1 GB of onboard memory for up to 20 years of load profile logging.

Interface Options: Available with a standard three-line LCD or an optional 5-inch color touchscreen. SEL-735 Power Quality and Revenue Meter - Documentation

SEL-735 Power Quality and Revenue Meter is a high-accuracy device designed for utility and industrial applications. Its official instruction manual provides comprehensive guidance on installation, advanced power quality monitoring, and complex revenue metering. selinc.com Core Functionality & Accuracy Revenue Metering: Introduction to SEL 735 Key Features Front Panel

Exceeds ANSI C12.20-2015 Class 0.1 and IEC 62053-22 Class 0.1 S accuracy requirements. Power Quality (PQ) Compliance: Fully compliant with IEC 61000-4-30 Class A

, enabling reliable measurement of harmonics (up to 63rd), flicker, interharmonics, and unbalance. Advanced Recording:

Includes independent load profile recorders for up to 512 channels and a voltage sag, swell, and interruption (VSSI) recorder with 1 ms resolution. Schweitzer Engineering Laboratories Setup & Installation The meter supports multiple form factors, including an Easily Extractable Meter (EXM)

option for retrofitting draw-out meters in less than one minute. selinc.com SEL-735 Power Quality and Revenue Meter - Documentation

For technical documentation on the SEL-735 Power Quality and Revenue Meter, the official resources provided by Schweitzer Engineering Laboratories (SEL) include comprehensive instruction manuals, quick-start guides, and specific application notes.  Core Documentation Links 

Official SEL-735 Documentation Portal: The primary source for the latest Instruction Manual, Data Sheets, and firmware updates.

SEL-735 Quick-Start Guide: Ideal for initial wiring and basic setup.

Installation Guide: Detailed instructions for surface mounting, portable versions, and easily extractable meter (EXM) options.  Manual Content Overview 

The standard SEL-735 instruction manual typically includes the following sections:  SEL-735 Power Quality and Revenue Meter - Documentation

9. Common Settings (Simplified Table)

| Parameter | Default | Typical Change | |-----------|---------|----------------| | PT ratio | 1:1 | 4160:120 | | CT ratio | 1:1 | 200:5 | | Demand interval | 15 min | 15 or 30 min | | Sag threshold | 90% of nominal | 90% | | Swell threshold | 110% | 110% | | THD alarm level | 5% | 8% per IEEE 519 |

4. Communications: The "ACSELERATOR" Advantage

The SEL-735 manual really shines in the communications section. This device supports multiple protocols simultaneously (Modbus TCP/IP, DNP3, and IEC 61850).

However, setting up an IP address and a subnet mask is just the beginning. The manual covers SEL Protocol and ACSELERATOR QuickSet. If you aren't using QuickSet software to configure the meter, you are doing it the hard way. The manual provides the specific database addresses (data points) for pulling data via Modbus, which is essential if you are integrating this into a legacy SCADA system.

How to configure Load Profile (from manual Setting LP1):

1. LP1 INT = 15 (15-minute intervals).
2. LP1 PAR = "KW,KVAR,PF,VLN" (What channels to log).
3. LP1 TRIG = "TIMED" (Log at interval end).

To export the load profile via serial: Use the LPD command.

Modbus Mapping (Section 8.3):

• Status Register 30001: Phase A voltage (scaled by 10).
• Floating Point Registers 40001-40002: Total kWh (IEEE 754 floating point).

Error Code: Access Level 1

• Meaning: You are in read-only mode.
• Fix: Type 2ACC (Access Level 2) and enter the password.

1. The Bread and Butter: Metering Setup

The first stop for most engineers is the metering configuration. The SEL-735 manual does an excellent job of breaking down wiring diagrams.

• The Basics: Are you setting up a 3-wire or 4-wire system? The manual provides clear connection diagrams (found in the Installation chapter) for standard potential transformer (PT) and current transformer (CT) configurations.
• The "Gotcha": One of the most common mistakes is incorrect phase rotation or CT polarity. The manual’s section on Verification is crucial here. Before you even think about communications, use the front panel to verify that your watts, vars, and VA are measuring positive (assuming load is flowing correctly) and that the phasors look right.