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Transformer & Substation Testing System
(TRAX)
NETA Power Test 2016
Fort Worth, TX
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TRAX
Transformer & Substation Test System
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Job Order Perform following tests on a D-Y 500 kV/138 kV 400 MVA
• Turns Ratio
• Winding Resistance
• Power Factor
• Leakage Reactance
• DRM for LTC diagnostics
Perform following test on a SF6 500 HV Circuit Breaker
• Contact Resistance
• Breaker Motion and Timing
TRAX – Instrument view (”My TRAX”)
TRAX – TTR @ 250/2000 V
TRAX – Excitation Current
TRAX – Power Factor Amplifier
TRAX – Power Factor @ 12 kV
TRAX – Winding Resistance @ 16/100 A
TRAX – Adaptive Demagnetization
Measure/calculate voltage-time integral (V*s) at high current (above
saturation current)
Create demagnetization cycles by reducing Vs value (typically 20%
reduction/step)
Effective • Verified against true AC demagnetization. Similar results in excitation current
and magnetic balance verification measurements
Fast • Significantly faster than static demagnetization algorithms for smaller
transformers (40 cycles demagnetization in less than 1 minute for 0.5 MVA
transformer)
Adaptive demagnetization
Magnetic balance after AC demag b-n Magnetic balance after adaptive demag b-n
a-n b-n c-n a-n b-n c-n
100% 68% 31% 100% 68% 31%
50% 100% 50% 50% 100% 50%
32% 67% 100% 31% 68% 100%
DRM on LTC - Patent pending Measure current , HV voltage, LV voltage (LV open)
R1 and R2 transition resistor values per tap (value/10). All within spec (± 10%)
Current
”ripple”
HV
voltage LV voltage
TRAX – Short-Circuit Impedance (Leakage Reactance)
Circuit Breaker Testing
TRAX – Contact Resistance @ 100 A
TRAX – Relay/timing
TRAX Solution – Apps!
10.4” touch screen
Dial
TRAX Top Panel
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AUX
LINK
Ethernet
MAIN FUSES
MAINS
INPUT
AUX GROUND
AC OUTPUT
200A
800A
DC OUTPUT
100A
DC
OUTPUT
16A
DC OUTPUT
300V
AC
OUTPUT
2200V
AC
OUTPUT
250V
GROUN
D
AUX
POWER
TRAX Side Panel
DC INPUTS
VOLTAGE INPUTS CURRENT INPUTS
FUSE 1-4 500
mA
LED indicators
TRAX – Top Panel - Analog Inputs
TRAX Solution – Apps!
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TRAX – Test Report w/ Nameplate Info
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Manual Operation
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TRAX Objective - Simplification
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New Megger Products
Visit us at
Booth 225
SMRT46D MWA SPI225 DLRO-100
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