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Line Protection ConceptsREx670

Parameswaran.S, Sr. Engineer, Application , PG-GAS , ABB India Ltd 13.04.2016

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Overview

Transmission Lines and Classifications

Protection Scheme

Distance Protection

Differential Protection

Power Swing Block

Back Up Protection

Directional Over Current

Over Voltage

Supplementary Functions Auto Reclose (1ph and 3 ph)

Synchro-check.

Month DD, Year | Sl ide 2

ABB Group

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Line Protection DistanceOverview

Month DD, Year | Sl ide 3

ABB Group

X X

79

21

85

68

67/67N

51/51N

50STB

DR

59/27

60

25

BUS

BPT BPT

BUS

52 52CT CT

LPT LPT

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Line Protection DifferentialOverview

Month DD, Year | Sl ide 4

ABB Group

X X

79

DR

59/27

60

25

BUS

BPT BPT

BUS

52 52CT CT

LPT LPT

87

67 / 67N

51 / 51N

DR

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Line Classification

Classification depends on

Source to Line Impedance Ratio (SIR)

Nominal Voltage

IEEE C37.113 119

Source Impedance Ratio

Month DD, Year | Sl ide 5

ABB Group

Line Type SIR

Short Line > 4

Medium Line 0.5 to 4

Long Line < 0.5

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Line Protection

Short Line

Differential Protection

Distance Protection with Permissive Over Reach or Blockingscheme.

Medium Line

Distance Protection with Permissive Under Reach or Permissive Over Reach

Back up Over current protection (Directional or Non Directional)

Optional over-voltage and differential protection

Application

Month DD, Year | Sl ide 6

ABB Group

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Line Protection

Long Line

Distance Protection with Permissive Under Reach optionalPermissive Over Reach

Back up Over current protection (Directional or Non

Directional) Over-voltage

Optional differential protection

Application

Month DD, Year | Sl ide 7

ABB Group

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DistanceMeasuring Principle

Month DD, Year | Sl ide 8

ABB Group

X X

BUS BUS

Z and the measuredzero sequence current is below the set value 3I0

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Fuse FailConfiguration and Settings

Month DD, Year | Sl ide 51 ABB Group

Settings shown areinformative only, notto be used for sitecommissioningdirectly without priorvalidationby ABB

Configuration shownare informative onlyand not to be adoptedfor commission

without prior validationby ABB

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Scheme CommunicationConfiguration and Settings

Month DD, Year | Sl ide 52 ABB Group

Settings shown areinformative only, notto be used for sitecommissioningdirectly without priorvalidationby ABB

Configuration shownare informative onlyand not to be adoptedfor commission

without prior validationby ABB

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Application ConfigurationDifferential Protection RED670

Month DD, Year | Sl ide 53 ABB Group

Configuration shownare informative onlyand not to be adoptedfor commissionwithout priorvalidation by ABB

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Parameter SettingDifferential Protection

Month DD, Year | Sl ide 54 ABB Group

Settings shown areinformative only, notto be used for sitecommissioningdirectly withoutvalidating.

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Case Study 1Normal Operation AR, Fault

Month DD, Year | Sl ide 55 ABB Group

Fault in line, and main CB not ready for AR, but Tie CBs AR issuccessful.

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Case Study 1Impedance Locus during first fault

Month DD, Year | Sl ide 56 ABB Group

Impedance Locus enters zone 1 and trips CB instantaneously

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Case Study 1Fault during reclaim time

Month DD, Year | Sl ide 57 ABB Group

Fault during reclaim time, all the three phases of Tie CB is opened

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Case Study 1Impedance Locus during second fault

Month DD, Year | Sl ide 58 ABB Group

Impedance Locus enters zone 1 and trips CB instantaneously

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Power Swing Block

Power swing may occur when

Heavily loaded line gets disconnected

A big generator trips

Wrong Synchronizing

Month DD, Year | Sl ide 59 ABB Group

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Power SwingImpedance Locus Movement

Month DD, Year | Sl ide 60 ABB Group

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