Electrical Control And Protection Part 4

This course introduces electrical control & protection systems which are a critical part of any electrical network

Last updated 2022-01-10 | 4.7

- Why we use interlocking on electrical substations
- Where to put metering in electrical networks
- How to read and understand protection and control drawings

What you'll learn

Why we use interlocking on electrical substations

Where to put metering in electrical networks

How to read and understand protection and control drawings

How to use test plugs and sockets and where to put them in the protection system

Why trip relays are needed on the protection system

How to use interposing relays

How mechanical interlocking is used to ensure that equipment is switched in a safe sequence

How we connect meters to current transformers & voltage transformers

How to define the ferruling for different types of circuits

Explain the different types of relay flags & contacts

* Requirements

* None

Description

Electrical control & protection systems are a critical part of the distribution & transmission systems that feed power to our cities & industries.

The fourth part of this protection course focuses on the building blocks of a protection system and the feeder protection systems that we use on high voltage networks

The course will go into detail for the following key topics :-

Introduce the general principles behind the different types of drawings we use and how we read them
Show how we apply ferruling to the different circuits on the protection system
Look at all of the different types of auxiliary relays that we use including trip relays, flag relays and interposing relays
Look at test blocks and test plugs and show how we integrate them into different types of circuits.
Introduce the principles behind interlocking, and develop the logic for some typical circuits
Show how we apply electrical interlocking to the substation systems
Introduce the ideas behind mechanical interlocking and provide some working examples of how it can be applied to a typical circuit.
Look at the principles behind metering, what equipment we use and how we define the current transformers and voltage transformers
Look in detail at power factor compensation and how we protect the capacitor banks that we use for these systems.

By the end of the course the student will be able to identify all of the key components of a protection & control system and understand how all of these components fit together to create a fully integrated system.

Who this course is for:

Electrical Engineers
Students
Electricians
Anyone interested in electrical design

Course content

1 sections • 13 lectures

Electrical control and protection part 4 13 lectures

Introduction Preview 03:32

Electrical protection is a key element in all electrical systems, and ensures that the electrical network can operate safely and efficiently.

Part 4 of this protection course will introduce you to some more protection systems, with a focus on interlocking, metering, ferruling and drawings.

Ferruling part 1 Preview 08:59

This particular lecture introduces the principles of ferruling which is used widely inside substations to identify the location of the individual connections that we need for any electrical protection system.

By the end of this lecture you will understand the different types of ferruling that we use and introduce a simple methodology for applying it to all protection systems.

Ferruling part 2 Preview 09:33

Ferruling is critical to the electrical system as it clearly identified every single signal in the substation, making it possible to operate the system safely, and allow it to be modified easily at a future date

This particular lecture shows how the ferruling system identified in the last lecture can be applied to various types of circuits

By the end of this lecture you will understand how the ferruling system operates, which will then allow you to apply it easily to any type of circuit you come across

Test blocks Preview 11:38

Substations have to be fully maintained and tested throughout their lives, so we need to build into them systems that allow the engineers to test individual circuits, without taking the main primary plant out of service and disconnecting the customers.

One way we do this is to install test blocks

By the end of this lecture you will understand the basic philosophy behind test blocks and test plugs, and how we identify the best locations for the test points in some common circuits.

Auxiliary relays part 1 Preview 11:04

Auxiliary relays are used throughout the electrical protection system for repeating signals, opening and closing the equipments and tying all of the different protections together into one fully functioning system.

By the end of this lecture you will understand the common features of all auxiliary relays and know what details you need to provide when you specify or order an auxiliary relay.

Auxiliary relays part 2 Preview 14:08

In this lecture will look at some of the common auxiliary relays that are used inside substations, and see how they can be applied.

By the end of this lecture you will understand the common features of trip relays, interposing relays and flag relays

Interlocking part 1 Preview 13:46

Safety of personnel and the health of the equipment's is the main priority on all electrical substations.

Interlocking is one of the ways in which we ensure that the system is operated safely and in a controlled manner, so that it is impossible to place the system and personnel in harms way.

By the end of this lecture you will understand all about the different types of interlocking that we use on substations, and how the different interlocking systems fit together into one operational network.

Interlocking part 2 Preview 10:47

The other main way that we control the safe operation and sequencing of the substation equipment is mechanical interlocking

By the end of this lecture you will know which understand the basic principles behind mechanical interlocking and understand how it can be applied in a practical way to different circuit configurations

Drawings Preview 15:52

Most transmission substations have hundreds of design and operational drawings, all of which work together to make sure that the substation is built as planned and can be operated and maintained safely.

By the end of this lecture you will understand the different types of drawings that we require on substations, the common features that appear on all drawings and how to read the drawings to get the information that you require

Metering part 1 Preview 09:41

In most parts of the works electricity has to be paid for and in this lecture we look at how this is achieved using metering systems.

By the end of this lecture you will understand the common features of metering systems at all voltage levels and know how the different types of power affect the system

Metering part 2 Preview 13:53

You should now know the theoretical principles behind metering and the different types of power that we need to measure

In this lecture we will look at the more practical aspects of metering and see how we connect the meters to the current and voltage transformers, and how we ensure that the meters are accurate.

Power factor compensation Preview 13:09

The power factor is a critical factor in the electrical network and affects how much customers pay for their electricity and how the network equipment is sized, in the lecture we look at how to improve the power factor using capacitors.

By the end of this lecture you will understand the basic principles behind power factor correction and how we protect the capacitor banks that we use in these systems.