Circuit Breaker design by Engr1696220355.pdf

Circuit breaker lecture

1. CIRCUIT BREAKERS
By: Mr. SyedTahirIqbalBukhari
AM (Grids)
8/31/2023
Circuit Breaker By Mr.Syed Tahir Iqbal
Bukhari AM(Grids)

2. AGENDA
Definition
Classification
Parts
Operation
Testing
Features
SOPs
CIRCUIT BREAKERS

3. CIRCUITBREAKER ???
???

29. PARTS OF CIRCUIT BREAKER
INTERRUPTER UNIT

30. PARTS OF CIRCUIT BREAKER
INTERRUPTER UNIT
FIXED CONTACTS

31. PARTS OF CIRCUIT BREAKER
INTERRUPTER UNIT
BLAST NOZZLE

32. PARTS OF CIRCUIT BREAKER
INTERRUPTER UNIT
MOVING CONTACTS

33. PARTS OF CIRCUIT BREAKER
INTERRUPTER UNIT
MAIN CONTACT ARCING CONTACT

42. TESTING OF CIRCUIT BREAKER
Contact Resistance Test.
CB Timing Test.
Minimum Trip TestMain Tests

43. TESTING OF CIRCUIT BREAKER
SF6 Purity Test
SF6 Dew Point Test
SF6 Low Pressure
SF6 Lockout
SF6 Gas Tests

44. Testing of Circuit Breaker
DES TEST for Oil CB
VIDAR TEST for Vacuum CB
Tests

45. Testing of Circuit Breaker
ON/OFF Local.
ON/OFF Remote.
Pole Discrepancy
Anti Pumping Feature TestFunctional Tests

51. TIMMING TEST OF CB USING TM1600

56. SOPCHECKSHEET:MAINTENANCE SCHEDULEANDCHECKS/TESTSOFHVCIRCUIT
BREAKERS
DescriptionofInspectionand
MaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standard/
SafetyPrecautionsD/W M3-6Y1 Y5/10
1.Visualinspection(Awalk
aroundvisualinspectionfrom
groundlevelandkeepinginview
thesafelimitsofapproachtolive
andmovingpartstocheck
apparentcondition,abnormal
noise,rustonbodyofthe
equipmentandcomponentparts,
positionofopeningandclosing
indicators,etc.)
Yes - - - WearPPEandcarrybasic
tools,multi-meter,clip-on-
ammeter,etc.Makeentriesof
theobservationsincheck
sheets/notebook.
2.SF6GasPressure(GCB) Yes - - - ShouldbeOKasperrated
pressure/indicatorand
correctedattemperature20
°C(*).Theindicatorshould
bekeptcleanandvisible.
Shouldbenogasleakages
*(+0.025barforevery1°C)
3.OilLevel(OCB) Yes - - - ShouldbeOKasper
indicator.Theindicator
shouldbekeptcleanand
visible.Shouldbenooil
leakages

57. DescriptionofInspection
andMaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standa
rd/
SafetyPrecautions
D/WM3-6Y1 Y5/10
4.AirPressure(ABCB) Yes ShouldbeOKasperrated
pressure/indicator.The
indicatorshouldbekept
cleanandvisible.Should
benooilleakages
5.SteelStructureGround
Connections
Yes- - - ShouldbeOKasper
design
6.HVTerminalConnections- - Yes - Dismantleconnections,
cleanproperly,apply
corrosioninhibitorand
fix/tight with
recommended torque.
Shouldbenohotspot/s
(checkduringnight
patrolling/thermovision
survey)
7.PorcelainBushing
Condition
Yes- - - Shouldbecleanandno
damage
8.SupportingStructure
Nut/Bolts/Level
- Yes- - ShouldbeOKasper
design,andtightand
secured

58. DescriptionofInspection
andMaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standa
rd/
SafetyPrecautions
D/WM3-6Y1 Y5/10
ControlCubicle
9.CubicleDoors,Doorlocks,
Doorpacking,Doorstops,
Light,Cleaning,Properglands
atwiringcableentrance,
Wiringcablenumbering,
Verminproofing,Ground
connections,etc.
Yes- - - ShouldbeOKandno
defect/damage
10.Controlswitches,Key
switches, Indications,
Accessories,etc.
Yes- - - ShouldbeOKandno
defect/damage
11.Spaceheaters&
Thermostatsetting
Yes- - - Shouldbeintactand
operative
12.WiringandTerminal
Blocks
- - Yes - Shouldbetightand
secured
13.OperationCounter Yes- - - Shouldbeintactand
operative

59. DescriptionofInspectionand
MaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standard/
SafetyPrecautions
D/W M3-6Y1 Y5/10
MotorSpringOperatingMechanism
14.CubicleDoors,Doorlocks,
Doorpacking,Doorstops,Light,
Cleaning,Properglandsatwiring
cableentrance,Wiringcable
numbering,Verminproofing,
Groundconnections,etc.
Yes - - - ShouldbeOKandno
defect/damage
15.Controlswitches,Key
switches, Indications,
Accessories,etc.
Yes - - - ShouldbeOKandno
defect/damage
16.Spaceheaters&Thermostat
setting
Yes - - - Shouldbeintactandoperative
17.WiringandTerminalBlocks- - Yes - Shouldbetightandsecured
18.OperationCounter Yes - - - Shouldbeintactandoperative
19.Cleaning Yes - - - ShouldbeOKneatandclean
20.ClosingSpringMotor
ChargingTime
- - Yes - Shouldbe OK as
recommended(usually<
15sec)

60. DescriptionofInspection
andMaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Stan
dard/
SafetyPrecautions
D/WM3-6Y1Y5/10
MotorSpringOperatingMechanism
21.Lubricationof
moving/sliding/rollingparts
- - Yes- ShouldbeOKasper
recommendations
22.ClosingDashPotOil
Level
- - Yes- ShouldbeOKasper
design
23.OpeningDashPotOil
Level
- - Yes- ShouldbeOKasper
design
24.ManualChargingof
ClosingSpring
- - Yes- ShouldbeOKasper
design
25.SupportingStructure
Nut/Bolts/Level
- Yes- - ShouldbeOKasper
design,tightandsecured
26.CBClose/Openor
ON/OFF Indication
(electrical/mechanical
indicators)
Shouldbeinaccordance
withtheactualposition
ofCBandOKasper
design

61. DescriptionofInspection
andMaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standa
rd/
SafetyPrecautions
D/WM3-6Y1 Y5/10
HydraulicOilPressureOperatingMechanism
27.CubicleDoors,Doorlocks,
Doorpacking,Doorstops,
Light,Cleaning,properglands
atwiringcableentrance,
Wiringcablenumbering,
Verminproofing,Ground
connections,etc.
Yes- - - ShouldbeOKandno
defect/damage
28.Controlswitches,Key
switches, Indications,
Accessories,etc.
Yes- - - ShouldbeOKandno
defect/damage
29. Space heaters
&Thermostatsetting
Yes- - - Shouldbeintactand
operative
30.WiringandTerminal
Blocks
- - Yes - Shouldbetightandsecured
31.OperationCounter Yes- - - Shouldbeintactand
operative

62. DescriptionofInspectionand
MaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standard/
SafetyPrecautions
D/W M3-6Y1 Y5/10
HydraulicOilPressureOperatingMechanism
32.HydraulicOilLevel Yes - - - ShouldbeOKasperdesign
33.HydraulicOilReplacement- - - Yes Shouldbereplacedasper
recommendations
34.HydraulicOilPressure Yes - - - ShouldbeOKasperdesign
35.HydraulicOilLeakages Yes - - - Shouldbenoleakages
36.N
2GasPressure - - Yes - ShouldbeOKasperdesign
37.HydraulicOil:LowPressure
AlarmandLockoutCheck
- - Yes - ShouldbeOKasperdesign
andremoteindications
38.HydraulicOilFilterCheck - - Yes - ShouldbeOKasperdesign,
cleanorreplacethefilteras
perrecommendations
39.HydraulicOilPressureSafety
ValveFunctionCheck
- - Yes - ShouldbeOKasper
recommendations
40.HydraulicOilPump:Cut
IN/OUTPressureValueCheck
- - Yes - ShouldbeOKasper
recommendations
41.HydraulicOilPumpand
AccessoriesMountingStructure
Nut/Bolts/Level
Yes - - - ShouldbeOKasperdesign,
Tightandsecure

63. DescriptionofInspectionand
MaintenanceWork
SpecifiedTimePeriod Remarks/Criteria/Standard/
SafetyPrecautionsD/W M3-6Y1 Y5/10
PneumaticOperatingMechanism
42.CubicleDoors,Doorlocks,
Doorpacking,Doorstops,Light,
Cleaning,properglandsatwiring
cableentrance,Wiringcable
numbering,Verminproofing,
Groundconnection,etc.
Yes - - - ShouldbeOKandno
defect/damage
43.Controlswitches,Key
switches,Indications,Accessories,
etc.
Yes - - - ShouldbeOKandno
defect/damage
44.Spaceheaters&ThermostatYes - - - Shouldbeintactandoperative
45.WiringandTerminalBlocks- Yes - - Shouldbetightandsecured
46.OperationCounter Yes - - - Shouldbeintactandoperative
47.RatedAirPressure Yes - - - ShouldbeOKasperdesign
48.RatedAirPressure:Low
PressureAlarmandLockout
Check
- - Yes - ShouldbeOKasperdesign
andremoteindications
49.AirCompressor:AirIntake
FilterCheck
- Yes - - ShouldbeOKasperdesign,
cleanorreplacefilterasper
recommendations

64. DescriptionofInspectionandMaintenance
Work
SpecifiedTimePeriod Remarks/Criteria/Standard/
SafetyPrecautionsD/W M3-6 Y1Y5/10
PneumaticOperatingMechanism
50.AirCompressor:LubricationOilLeveland
ConditionCheck
- Yes - -ShouldbeOKasperdesign,replaceoilas
recommended
51.AirCompressor:OperationHoursCounterCheckYes- - -Shouldbeintactandoperative
52.AirPressure:SafetyValveFunctionCheck - - Yes ShouldbeOKasperrecommendations
53.AirCompressorandAccessoriesMounting
StructureNut/Bolts/Level
- Yes - -ShouldbeOKasperdesign,andtightandsecured
Tests
54.TestOperation:ON/OFFLocal/Remote/Auto- - Yes- Shouldbeintactandoperativealongwithremote
indications
55.CBPositionMechanicalIndication(ON/OFF) Yes- - - Shouldbecorrectasperactualposition
56.OilDESTest(OCB) - - Yes- DESvalueshouldbe>40KVat2.5mmgap,Replace
oilafter10tripping
57.SF6GasPurityTest(GCB) - - Yes- Purityshouldbe>97%
58.SF6DewPoint/MoistureContentsTest(GCB) - - Yes- Dewpointshouldbe>-15°CorMoisturecontents
shouldbe<50PPm
59.ContactResistanceTest - - Yes- ShouldbeOKasrecommended
60.Close/OpenTimeTest - - Yes- ShouldbeOKasrecommended.Thepermissible
differencesbetweentimingsof3-polesandbetween
timingsofbreakswithin1-poleare:
Closingtime:5ms(1/4cycle)
Openingtime:3.33ms(1/6cycle)
Withinbreaksof1-pole:2.5ms(1/8cycle)
61.Anti-PumpingFeatureCheck - - Yes- ShouldbeOKandintact
62.PoleDiscrepancyControlFeatureCheck
(applicableinsingle-poleoperatedCBs)
- - Yes- ShouldbeOKandintact,remoteindication
63.MinimumVoltageClose/OpenTest - - Yes- TheCBshouldopenat50-75%voltageofratedvalue
andcloseat80%voltageofratedvalue
64.SF6Gas:LowPressureAlarmandLockout
Check
- - Yes- ShouldbeOKasperdesignandremoteindications

66. 500KVCIRCUITBREAKERSTIMINGANDCONTACTRESISTANCEVALUES(H:Hydraulic,
S:MotorSpring,P:PneumaticOperatingMechanisms)
Sr.
No.
Make Type ClosingTime
(ms)
(Maximum)
OpeningTime
(ms)
(Maximum)
Contact
Resistance
microΩper
Pole
(Maximum)
1 SIEMENS(H)SF
6 3AT5(4Breaks
perPole)
90±10 18±3 240
2 SIEMENS(H)SF
6 3AT4(4Breaks
perPole)
90±10 18±3 240
3 SIEMENS(H)SF
6 3AT3E1 (2
BreaksperPole)
80±6 18±2 75±5
4 SIEMENS(H)SF
6 3AT2E1 (2
BreaksperPole)
80±6 18±2 75±5
5 SIEMENS(H)SF
6
(GIS)
8DQ14 (2
BreaksperPole)
80±6 18±2 75±5
6 MERLINGERIN(H)SF
6FA4(4Breaks
perPole)
42±4 19±4 250
7 MERLINGERIN(H)SF
6FA4R(4Breaks
perPole)
42±4 19±4 250
8 MERLINGERIN(H)SF
6GFA2R (4
BreaksperPole)
42±4 19±4 250
9 MERLINGERIN(H)SF
6GFA4R (4
BreaksperPole)
42±4 19±4 250
10TOSHIBA(H)SF
6 GSR-500R2 100 18 100
Table-9h: 500KV CIRCUIT BREAKERS TIMING AND CONTACT RESISTANCE DATA

67. 11TOSHIBA(H)SF
6 GSR-500R2C100 18 100
12HITACHI(H)SF
6 OFTB
500/40L
13GECALSTHOM(H)
SF
6
FX32D
14GECALSTHOM(H)
SF
6
FX22Z
15MITSUBISHI(P)SF
6500
SFMT/50B
16ABB(S)SF
6 HPL550B2
(4Breaksper
Pole)
65 19±3 80
17AEG(P)SF
6 S4M-550P100 25 200
18AREVA(S)SF
6 GL317D
(FK3-4)
19ASEA(S)SF
6 HPL 550/
4004LT
20DELLE ALSTHOM
(ABCB)
PK6C 450