Line protection with SIPROTEC 7SA8

• #753 Course Code
• Line protection with SIPROTEC 5 7SA8 (Basic to advanced level)
• Trainer: Dr. Saeed Roostaee (Profile)
• Course creation: Feb 2025
• Last update: March 2025
• Total time till now: 7 hours & 55 minutes

Our video-recorded training on Line Protection based on SIPROTEC 5 7SA offers a convenient and flexible learning option for participants who prefer to study at their own pace. Our expert instructors deliver comprehensive training modules and cover all the essential aspects of line protection using the SIPROTEC 5 7SA8 relay IED. Participants can access the video recordings anytime, anywhere, allowing them to review the content as needed and learn at a time that suits their schedule.

The following sections provide an overview of the course structure and topics covered in our training package.

Line Protection

The training course begins by introducing the fundamental principles and concepts of line protection, including (Length: 1 hour and 54 minutes):

• Faults in transmission lines
• Over-current issues in the line protection
• Why distance protection function
• Line Distance Basic Principle
• Effect of fault resistance on distance protection function
• Distance characteristics (MHO & Quad)
• Directional determination
• Distance Measurement Principle (6 loops)
• Load area and fault area with resistance for phase-to-phase and phase-to-ground faults
• Stepped Distance
• Distance parameters in the SIPROTEC 7SA8 (an overview)
• Fault resistance with infeed effect (over-reach, under-reach)
• Zone-inclination angle
• Distance protection classic and RMD methods
• Tele-protection scheme
• Tele-protection config in SIPROTEC 5 7SA8
• Switch on to fault (SOFT)
• Auto-recloser (ANSI 79)
• STUB protection
• Power swing blocking

SIPROTEC 5 7SA Config

The second chapter provides detailed insights into SIPROTEC 7SA8 hardware and configuration with the below topics (Length: 1 hour and 12 minutes):

• SIPROTEC 5 7SA basic template
• SIPROTEC 5 7SA RMD config
• SIPROTEC 5 7SA config in 1.5 CB arrangement
• SIPROTEC 5 7SA Config case study config (functions and signals)

Distance Protection

Moving on to the next chapter, distance protection function in the SIPROTEC 7SA8 is discussed with the below highlighted topics (Length: 2 hour and 12 minutes).

• Distance Protection for Grounded Systems
• Structure of the Distance protection
• Ground-fault detection logic
• Supervision of the zero-sequence current 3I0
• Supervision of the ratio of the zero-sequence current and negative-sequence current (3I0/3I2)
• Supervision of the zero-sequence voltage V0
• Ground-fault detection parameters
• Pickup method
• Impedance pickup
• Overcurrent pickup
• V/I pickup
• V/I φ pickup
• Distance zones
• Loop Selection
• Direction determination
• Zone with Quadrilateral Characteristic
• Operate Curve with Quadrilateral Characteristic
• MHO Characteristic Curve
• Circular Characteristic Curve
• Output Logic of the Distance Protection

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Line Function Group

The Line Function Group encompasses main protection and supervision functions available in SIPROTEC 5 7SA8 relays. Grasping the logic and parameters of this function block is crucial, as they are integral to all tasks required for line protection and monitoring. This chapter provides a comprehensive explanation of the structure and blocks within the line function group, focusing on the key topics highlighted below (Length: 1 hour and 6 minutes).

• Structure of the Function Group
• Operational Measured Values
• Line data
• Operational measurement
• Inversion of Power-Related Measured and Statistical Values
• The Kr and Kx parameters
• R0 Zero-sequence system resistance
• X0 Zero-sequence system reactance
• R1 Positive-sequence system resistance
• X1 Positive-sequence system reactance
• CT saturation detection
• Series compensation
• Process monitor
• Current-Flow Criterion Logic & Parameters
• Circuit-Breaker Condition for the Line
• Closure detection Logic & Parameters
• 1-Pole Open Detector
• Voltage criterion
• Cold-load pickup detection
• Output logic of the function group

Tele-Protection

Information exchange with the remote line end is applied throughout the line length to enable selective and non-delayed fault clearance of all faults. This chapter discussed the SIPROTEC 5 7SA8 Tele-protection functions and logic with the highlighted topics below (Length: 1 hour and 12 minutes).

• Why Teleprotection?
• Permissive Underreach Transfer Trip (PUTT)
• Direct Underreach Transfer Trip (DUTT)
• Permissive Overreach Transfer Trip (POTT)
• Teleprotection with Ground-Fault Protection
• 85-67N transient blocking
• Echo and Tripping in the Event of Weak Infeed
• Weak infeed parameters
• Detection of Weak Infeed logic

Supplementary Functions

This chapter is currently being developed with the below topics and will be updated shortly. Stay tuned!

• Switch onto Fault (SOTF)
• Logic Diagram of the Stage Instantaneous Tripping at Switch onto Fault
• Power-Swing Blocking
• Functionality of Power-Swing Blocking
• Trajectory monotony
• Trajectory continuity
• Trajectory uniformity
• Fault Locator

7SA Testing & Commissioning

SIPROTEC 5 7SA8 distance protection testing

Enroll in this Training

Looking to develop your skills and knowledge? Click the button below to register now!

• SIPROTEC 7SA8 distance protection testing procedure
• How to draw SIPROTEC 7SA8 characteristics
• RIO and XRIO
• Distance RIO parameters
• Testing of the SIPROTEC 5 7SA8 relay
• SIPROTEC 7SA8 PTL

Sample Parts:

Supplementary files

Click here to download SIPROTEC 5 7SA8 Manual (Distance Protection, Line Differential Protection, and Breaker Management 7SA87, 7SD87, 7SL87, 7VK87 V9.8)

Line Differential Part 1Download

Line Differential Part 2Download

Line Differential Part 3-1Download

Line Differential Part 4Download

Line Differential Q&A Download

Training on the Line Protection based on SIPROTEC 5 7SA

Enrolling in our video-recorded training program allows participants to benefit from high-quality instruction, valuable insights, and real-world examples that will help them master line protection concepts based on SIPROTEC 5 7SA. Whether you are a busy professional seeking professional development or a student looking to enhance your knowledge, our video-recorded training is an excellent resource for expanding your skills in line protection and distance protection functions in the SIPROTEC 5 7SA8 line distance protection relays.

Training on line protection with the SIPROTEC 7SA8 relay is essential for power systems and T&C engineers, and technicians to effectively utilize its features and functionalities. This training program covers the basics and advanced line protection functions based on the SIPROTEC 5 7SA8 series.