
Explain leakage distance on insulators, how grooves lengthen leakage paths to raise resistance and reduce leakage current, and arcing horns that protect transformers from lightning surges.
Inspect high voltage bushings through visual checks for leakage, oil color, carbon traces, and infrared scans; perform periodic cleaning and test power factor and dissipation factor to assess health.
Examine rupture discs as a pressure safety device in transformers, noting that once operated, the disk is permanently damaged and becomes a non-recording device.
Explore how the rate-of-rise oil pressure relay protects transformers from sudden pressure spikes due to faults or short circuits. Featuring bellows, bleed valve, and temperature compensation.
Explains tap changers, their off-circuit and on-load types, how changing taps alters transformer voltage by adding or subtracting turns, and how impedance and polarity options regulate voltage and limit current.
Describe the 1927 make-before-break principle for on-load tap changers, enabling interruption-free load transfer by closing both contacts, ensuring synchronization, and limiting short-circuit current with resistors or reactors.
Explore tap changer winding arrangements and regulating windings, including normal taps, step voltages, and LTC limits, with delta and linear connections and various changeover selectors for voltage regulation.
Explore off-load no-load tap changers for distribution transformers, featuring five tap positions with zero regulation at the normal tap and plus 5 percent regulation, in linear and rotary designs.
Master the on-load tap changer (OLTC) with its external motor drive, selector and diameter switches, vacuum switch, bypass path, and current-limiting reactors.
Learn how on-load tap changer works, tracing the sequence of selector switch movements, bypass and diverter actions, and current control through limiting reactors and the ECB.
Hi,
Trainer Introduction:
Your trainer brings over 21 years of experience in operation & maintenance, erection, testing, project management, consultancy, supervision, substation automation, SCADA, and commissioning. With a background spanning power plants, high voltage substations, and HVDC installations, he has worked with renowned organizations such as Siemens Saudi Arabia. He has been involved in over 20 high-voltage substation projects across Pakistan and Saudi Arabia.
His expertise encompasses a wide range of areas including protection systems, substation automation systems, design, testing, and commissioning of power generation systems, high voltage switchgear, protection relays, and control schemes. He has a proven track record of leading testing and commissioning teams for implementing electrical infrastructure projects for industrial clients, including steel and petrochemical industries.
Mastering transformer protection is made up in total six parts, this is part 5 of 6.
Find below details of topics covered in this training.
Topics covered in Part 5:
123 Creepage Distance, Clearance Distance and arcing horn
124 HV bushing maintenance
125 Rupture Disc
126 Sudden Oil Pressure Relay
127 Tap Changers Types and requirements
128 Make before break patent of onload tap changer by Dr Janson 1927
129 Tap Changer Winding Arrangements
130 Off load tap changer
131 On Load Tap Changer
132 On Load Tap changer Working
133 OLTC Sequence of operation in detail
134 OLTC General Arrangements
135 What is the basic difference between Transition Resistance and Reactor type
136 What are the advantages of vacuum type OLTC
137 What preventive maintenance, measures can be used for improvement in life
138 Tie In Resistor in Tap Changer
139 Tap Changer Design Methodologies
140 Tap Changer Animation
141 Air Bleeding in Transformer
142 Test Performed On Transformer
144 Transformer Turn Ratio Test
145 Purpose Transformer Open circuit and short circuit test
146 Transformer Open Circuit Test
147 Short Circuit Test of Transformer
148 Impedance Test of Transformer
149 C and DF or Tan Delta Test of transformer
150 How to Predict the Result of Tan Delta Testing
151 Sweep Frequency Response Analysis Test
152 DC winding Resistance Test
153 Transformer Demagnetization after Winding Resistance Test
154 Going Through Transformer FAT Report
Regards
Elite Engineering