Module 4 Commissioning Circuit Breakers
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Transcript of Module 4 Commissioning Circuit Breakers
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04/09/23 Module Three 1
SUBSTATION COMMISSIONING COURSE
MODULE FOUR
CIRCUIT BREAKERSTESTING PROCEDURES
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04/09/23 Module Three 2
INTRODUCTION
• The electrical commissioning and acceptance testing of electric power systems is essential for the energization of any electrical system for the first time
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04/09/23 Module Three 3
INTRODUCTION
Module Four
• Discuss theory and ratings• Safety issues• Test equipment operation & hands
on testing
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04/09/23 Module Three 4
INTRODUCTION
Skills learned in MODULE FOUR:
• Acceptance testing for Circuit Breakers
• Operate Breaker analyzer• Apply safe work practices• Analyze test values• Complete test forms
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04/09/23 Module Three 5
CIRCUIT BREAKERS
North American Standards
• US Standards– NEMA– ANSI/IEEE– IEEE standards are harmonized
with IEC– IEC are harmonized with IEEE
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04/09/23 Module Three 6
CIRCUIT BREAKERS
Most Significant Standards
• C37.04 Rating Structure for AC High Voltage Circuit Breakers
• C37.06 AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis – Preferred
Ratings and Related Required Capabilities• C37.09 Standard Test Procedures for AC High
Voltage Circuit Breakers Rated on a Symmetrical Current Basis
• C37.010 Application Guide for AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis
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04/09/23 Module Three 7
CIRCUIT BREAKERS
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04/09/23 Module Three 8
CIRCUIT BREAKERS
• Maximum Voltage• Voltage range factor• Continuous current• Short circuit
– Symmetrical current– Asymmetrical current
• % DC component• Interrupting time• Maximum tripping delay
• TRV – Transient recovery voltage
• Withstand voltage– Power frequency– Lightning impulse
• Closing and latching current
Rated Characteristics
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04/09/23 Module Three 9
CIRCUIT BREAKERS
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04/09/23 Module Three 10
CIRCUIT BREAKERS
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04/09/23 Module Three 11
CIRCUIT BREAKERS
Application Considerations
• Circuit Beaker definition (IEEE C37.100)
A circuit breaker is a mechanical device capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specific time and breaking currents under specified abnormal conditions such as those of short circuit
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04/09/23 Module Three 12
CIRCUIT BREAKERS
• The upper limit of the system voltage for continuous operation
• Rated maximum voltage:– 4.76 kV– 8.25 kV– 15 & 15.5 kV– 25.8 kV– 38 kV
Maximum Voltage
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04/09/23 Module Three 13
CIRCUIT BREAKERS
• All North American Beakers are rated at 60Hz
• Manufacturers to be consulted for operation at other frequencies
Frequency
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04/09/23 Module Three 14
CIRCUIT BREAKERS
• Operating within temperature rise specification• Continuous current rating for normal operating
conditions– Ambient temperature between -30 ºC to 40 ºC– Installed above sea level and below 1000 m– Free of extreme environmental contamination– Not affected by solar radiation– Short time over current permissible for
• Motor starting, cold load pick-up, emergency conditions …
Continuous Current
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04/09/23 Module Three 15
CIRCUIT BREAKERS
• Preferred continuous current ratings:– 600 A– 1200 A– 2000 A– 3000 A
• > 3000A required force cooling for indoor metalclad
Continuous Current
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04/09/23 Module Three 16
CIRCUIT BREAKERS
• Rated constant symmetrical current rating in KA rms– Synonymous with SF6 and vacuum breakers– Older breakers rated in constant MVA (oil, air-
magnetic)• Isym = (Rated Isc) x (Rated Vmax / Vop) or• Isym = MVA / (Vop x √3)
Short Circuit Current - Symmetrical
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04/09/23 Module Three 17
CIRCUIT BREAKERS
• Multiplier factor for symmetrical current rating• Modern / future breakers will be rated at K = 1• Factor K to be eliminated in future standards• Breakers to be rated on a constant symmetrical
current rating• K Factor to address older breaker rated in constant
MVA
Voltage Range Factor K
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04/09/23 Module Three 18
CIRCUIT BREAKERS
• Asymmetrical current rating– Symmetrical rating multiplied by S– Based on % DC rating for modern breakers– %DC using standard decay curve for X/R = 17
Short Circuit Current - Asymmetrical
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04/09/23 Module Three 19
CIRCUIT BREAKERS
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04/09/23 Module Three 20
CIRCUIT BREAKERS
• % DC rating related to the speed of the breaker• Fast breakers interrupt more DC current
– Peak currents can be 2X symmetrical peak value– Symmetrical current rides on decaying DC current– DC current decay based on X/R of system
• Slow breakers interrupt less DC current– Current falls towards symmetrical value
% DC
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04/09/23 Module Three 21
CIRCUIT BREAKERS
• The standard DC decay time constant can be calculated by:
τ = (X/R) / (2 π f)
for X/R ratio of 17, τ = 45 msec
Short Circuit Current - Asymmetrical
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04/09/23 Module Three 22
CIRCUIT BREAKERS
• The asymmetrical interrupting rating is calculated by: Iassym = Isym x S
S = √ [ 1 + 2 (%dc/100)2 ]
• Iassym = Isym x √ [ 1 + 2 (%dc/100)2 ]
Short Circuit Current - Asymmetrical
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04/09/23 Module Three 23
CIRCUIT BREAKERS
• Maximum allowable time between– Energization of trip coil and arc extinction time
• Rating based on:– Rated control voltage– Maximum opening mechanical pressure– Arc extinction in all 3 poles
Interrupting time
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04/09/23 Module Three 24
CIRCUIT BREAKERS
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04/09/23 Module Three 25
CIRCUIT BREAKERS
• Why Delay tripping ?– Breaker contacts works less, less wear and tear– Trade-off between increased interrupter / contact
heating and speed
• Contact heating a function of I2t
Permissible Tripping Delay T
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04/09/23 Module Three 26
CIRCUIT BREAKERS
• Asymmetrical current rating for closing unto a fault
• Enables downstream protection to operate– Can be man made faults – leaving grounds on
Closing and Latching Current
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04/09/23 Module Three 27
CIRCUIT BREAKERS
• Power Frequency (60 Hz) dielectric test• 1 minute time duration• Part of total lightning impulse tests
– Trivia: Rate of rise at 2%/sec of the 75% level– Test voltage reached between 60-70 sec, 90 sec
OK
Dielectric Withstand
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04/09/23 Module Three 28
CIRCUIT BREAKERS
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04/09/23 Module Three 29
CIRCUIT BREAKERS
• Series of factory dielectric tests– Power frequency test; dry (1 minute), wet (10 sec)– Full-wave lightning impulse– Chopped wave lightning impulse– Switching impulse
• Tests the insulation system– Phase to ground– Across open contacts
Lightning Impulse Withstand Voltage
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04/09/23 Module Three 30
CIRCUIT BREAKERS
• Voltage generated across open contact after current interruption
• Fast rise time and can peak at 2X ac crest value• Dielectric must not flash-over after contact have
stopped and parted• Contact separation is greater than required for
current interruption• Rated in dV/dT or kV peak / time to peak
TRV – Transient Recovery Voltage
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04/09/23 Module Three 31
CIRCUIT BREAKERS
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04/09/23 Module Three 32
CIRCUIT BREAKERS
• Name• Type• Serial number• Year of manufacture• Maximum voltage• Continuous current• Frequency• Withstand voltages
• Duty cycle• Interrupting time• Short circuit current• % dc• Short time current
duration
Nameplate Data
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04/09/23 Module Three 33
CIRCUIT BREAKERS
• Norm. operating pressure• Min. operating pressure• Volume of oil per tank• Weight• Instruction book number• Part list number• Capacitance current
switching• Out of phase current
switching
Nameplate Data
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04/09/23 Module Three 34
CIRCUIT BREAKERS
• Close coil volt. range• Trip coil volt. range• Closing / closing current• Motor current / voltage• Low pressure alarm / lock
out pressure operating points
• Wiring diagram number• Instruction book number• Parts list number
Mechanism Nameplate Data
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04/09/23 Module Three 35
CIRCUIT BREAKERS
• Shall include identification and pertinent operating characteristics
Accessories Nameplate Data
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04/09/23 Module Three 36
CIRCUIT BREAKERS
• Essential markings should be provided– Operating devices and
positions– Instructions for
operation– Special precautions– Environmental
warnings
Instructions and Warning Signs
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04/09/23 Module Three 37
CIRCUIT BREAKERS
Types of circuit Breakers• Air magnetic• Oil• Air blast• SF6• Vacuum
Air Magnetic• Obsolete technology for
MV class• Uses air as the dielectric• In use until 1975
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04/09/23 Module Three 38
CIRCUIT BREAKERS
Types of circuit Breakers• Air magnetic• Oil• Air blast• SF6• Vacuum
Oil (tank / minimum / bulk)• Obsolete technology
except for low voltage applications
• Cease production is the 1990’s
• Uses oil as the dielectric• Up to 230 kV• Minimum oil was a
replacement for air-magnetic in MV class
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04/09/23 Module Three 39
CIRCUIT BREAKERS
Types of circuit Breakers• Air magnetic• Oil• Air blast• SF6• Vacuum
Air Blast• Obsolete technology• Use dry air as the
dielectric• Up to 500 kV• Hi pressure up to 3600
psi
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04/09/23 Module Three 40
CIRCUIT BREAKERS
Types of circuit Breakers• Air magnetic• Oil• Air blast• SF6• Vacuum
SF6• Today’s technology• Use SF6 as the dielectric• Use in MV and HV class
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04/09/23 Module Three 41
CIRCUIT BREAKERS
Types of circuit Breakers• Air magnetic• Oil• Air blast• SF6• Vacuum
Vacuum• Today’s technology• Use vacuum as the
dielectric• Limited to MV
applications
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04/09/23 Module Three 42
CIRCUIT BREAKERS
Functions of Circuit Breakers
• Switching• Fault Interruption
– Interrupters– Current interruption
Switching• Control the flow of electrical
energy by opening or closing its main contacts
• Breaker can be controlled locally or remotely via SCADA
• Operations accomplished by energizing the tripping or closing coils
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04/09/23 Module Three 43
CIRCUIT BREAKERS
Functions of Circuit Breakers
• Switching• Fault Interruption
– Interrupters– Current interruption
Fault Interruption• The primary equipment used
for interrupting short circuit currents
• A circuit breaker used for three-phase is called a three pole breaker.
• One interrupter per pole for MV circuit breakers
• Series interrupters per pole for HV circuit breakers
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04/09/23 Module Three 44
CIRCUIT BREAKERS
Functions of Circuit Breakers
• Switching• Fault Interruption
– Interrupters– Current interruption
Interrupters• Mounted on insulators• Encloses main contacts in
an insulating medium• Moving contact connected to
an insulated operating rod• Operating rod connected to
the operating mechanism• Mechanism provides energy
to operate at rated speed
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04/09/23 Module Three 45
CIRCUIT BREAKERS
Functions of Circuit Breakers
• Switching• Fault Interruption
– Interrupters– Current interruption
Current interruption• Arcing contact separates• Arc energy used to built
dielectric pressure• Dielectric moves between
contacts at current zero crossing
• Maintained dielectric equates to current interruption
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04/09/23 Module Three 46
SAFETY CONSIDERATION
High Voltage Safety
• Electrical safety using high voltage test equipment– Testing performed by qualified personnel– Familiarization with test set operations– Know the hazards for the specific test
• Safe working practice and guidelines– Safety practice regulations– IEEE standard 510-1983; Recommended Practice
for Safety in High Voltage Testing and High Power Testing
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04/09/23 Module Three 47
SAFETY CONSIDERATION
X-Ray Radiation
• High voltage across vacuum gap can produce x-ray radiation
• Vacuum bottle integrity test voltage not to exceed manufacturer’s recommended levels or 75% of the factory dielectric test
• Indoor breaker optimally tested in the test / disconnected position for shielding
• Outdoor breakers tested at 1 metre distance with covers in place as per indoor breakers outside its cubicle
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04/09/23 Module Three 48
SAFETY CONSIDERATION
Static High Voltage
• Electrostatic charge may be retained after high voltage potential is removed
• Ground the primary bushing and mid-band ring for at least 60 seconds
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04/09/23 Module Three 49
SAFETY CONSIDERATION
Stored Energy• Mechanical adjustments and checks should only be
attempted after:– Stored energy have been discharge / isolated– Operating mechanism have been blocked
• Circuit breaker operation rely on the release / application of energy for closing and tripping operations– Charged spring / pneumatic pressure / hydraulic
pressure– Energizing large operating coils
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04/09/23 Module Three 50
CIRCUIT BREAKER TESTING
• Mechanical Testing– Inspection– Manual tripping and
closing– Mechanical interlocks– Contact timing
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
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04/09/23 Module Three 51
CIRCUIT BREAKER TESTING
• Mechanical Testing– Inspection– Manual tripping and
closing– Mechanical interlocks– Contact timing
Inspection• Verify the ratings
matches the design specifications
• Verify installed correctly• Determine of any physical
damage during installation or transport
• Check all auxiliary equipment are supplied
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04/09/23 Module Three 52
CIRCUIT BREAKER TESTING
• Mechanical Testing– Inspection– Manual tripping and
closing– Mechanical interlocks– Contact timing
Manual tripping / closing• Energy storage devices• Trip / latch mechanism• Manual charging system• Operations counter
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04/09/23 Module Three 53
CIRCUIT BREAKER TESTING
• Mechanical Testing– Inspection– Manual tripping and
closing– Mechanical interlocks– Contact timing
Mechanical Interlocks• Positive interlock• Spring discharge interlock• Rating interference plate
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04/09/23 Module Three 54
CIRCUIT BREAKER TESTING
• Mechanical Testing– Inspection– Manual tripping and
closing– Mechanical interlocks– Contact timing
Contact Timing• Measure the operating
parameters– Closing / tripping time– Discrepency time– Operating rod travel
performance• Two types of timer
– Digital timer– Digital timer and travel
analyzers
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04/09/23 Module Three 55
CIRCUIT BREAKER TESTING
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04/09/23 Module Three 56
CIRCUIT BREAKER TESTING
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04/09/23 Module Three 57
CIRCUIT BREAKER TESTING
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
Insulation Resistance• DC voltage test• 100% of the Rated AC
phase-ground crest value• Crest value = 1.414 x
VAC rms• Preliminary to the
dielectric withstand test
Note: Value > NETA recommended test value
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04/09/23 Module Three 58
CIRCUIT BREAKER TESTING
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04/09/23 Module Three 59
CIRCUIT BREAKER TESTING
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
Dielectric Withstand• AC 60 Hz test at 75% of
the factory test value• Voltage applied across
open contacts • Voltage applied across
phase to ground with contacts closed
• Untested terminal grounded
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04/09/23 Module Three 60
CIRCUIT BREAKER TESTING
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04/09/23 Module Three 61
CIRCUIT BREAKER TESTING
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
Vacuum bottle integrity• AC 60 Hz test at 75% of
the factory test value• Voltage applied across
open contacts• Test time can be limited
to 10 sec for some breaker type
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04/09/23 Module Three 62
CIRCUIT BREAKER TESTING
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04/09/23 Module Three 63
CIRCUIT BREAKER TESTING
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
Contact Resistance• 100 Adc• Resistance from bushing
terminal to bushing terminal
• Using 4-wire resistance measurement test set
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CIRCUIT BREAKER TESTING
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CIRCUIT BREAKER TESTING
• Electrical Testing– Insulation resistance– Dielectric withstand– Vacuum bottle integrity– Contact resistance– Operations– PF (maintenance test
as required)
Operations• Breaker in the normal
pos’n• Control circuit wiring
tested (shorts / grounds)• Operation tests for:
– Close and trip test– Trip-free test– Ant-pump test– Anti-slam test– Interlock test
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CIRCUIT BREAKER TESTING
• Electrical Testing– PF Test– (Classified as a
maintenance test• Insulation test• Bushing test
Power Factor Test• Establish initial baseline
reading for comparison and trending
• Similar to the capacitance and power dissipation test
• Test voltage below operating phase-to-ground value
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CIRCUIT BREAKER TESTING
• Electrical Testing– PF (maintenance test
as required)• Insulation test• Bushing test
Insulation Test
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CIRCUIT BREAKER TESTING
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CIRCUIT BREAKER TESTING
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CIRCUIT BREAKER TESTING
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CIRCUIT BREAKER TESTING
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CIRCUIT BREAKER TESTING
• Electrical Testing– PF (maintenance test
as required)• Insulation test• Bushing test
Bushing Test• Hot collar test
– Non condenser bushing
– GST• Collar material
– Conducting– Uniform dimension
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CIRCUIT BREAKER TESTING
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NETA STANDARD
6. NETA Acceptance Testing Procedure
» 6.1 Visual and Mechanical Inspection
» 6.2 Electrical Test
» 6.3 Test Values
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TEST SET MANUAL
Module 4:Breaker Timing Test setPower Factor Test Set
Module 2 & 3CT Tester15 KV Insulation Resistance Test setAC High Potential Test setDC High Potential Test setDigital Low Resistance Test set
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