Tokyo Sangyo Co., Ltd. · TSE:8070
Tokyo Sangyo — SERGI Transformer Protector — Technical Presentation (August 2026)
19 slides from Tokyo Sangyo's technical presentation, Aug 1, 2026
Slide 1: Transformer Protector: The Only Proven Solution Against Transformer Explosion
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION Template ref: Amxae170329Fe Copyright © STP 2019 During a transformer short circuit, the TRANSFORMER PROTECTOR is activated within milliseconds by the first Doc Reference: AtTPghc16-211027Fe dynamic pressure of the shock wa
Slide 2: Copyright notice
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION The content of this PowerPoint presentation is the exclusive property of SERGI TRANSFORMER PROTECTOR. It cannot be copied or downloaded, in whole or part, without express permission from SERGI TRANSFORMER PROTECTOR. Unautho
Slide 3: Causes of transformer explosion and fire
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION Power transformers are critical elements due to the large oil volume contained in contact with high voltage elements. A broad range of events can cause the transformer explosion and fire, such as: • Design Defect • Overcurr
Slide 4: Reference to Fast Depressurization System in NFPA 850
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION Reference to Fast Depressurization System in NFPA 850 NFPA 850 Recommendation Review of the 4 defined criteria: - « A passive mechanical system » - « Fast depressurization » - « Triggered by the dynamic pressure peak genera
Slide 5: The Protector Operation
TRANSFORMER PROTECTOR TRANSFORMER THE PROTECTOR ONLY PROVEN SOLUTION Operation AGAINST TRANSFORMER EXPLOSION Template ref: Amxae170329Fe Copyright © STP 2019 During a transformer short circuit, the TRANSFORMER PROTECTOR is activated within milliseconds by the first Doc Reference: AtTPghc16-211027Fe
Slide 6: Operation: electrical arc and pressure peak
TRANSFORMER PROTECTOR • Electrical arc THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • Pressurized gas bubble • Dynamic pressure peak propagation Template ref: Amxae170329Fe Copyright © STP 2019 During a transformer short circuit, the TRANSFORMER PROTECTOR is activated within milliseconds b
Slide 7: Step 1: TP Activation
TRANSFORMER PROTECTOR • Electrical arc THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • Pressurized gas bubble • Dynamic pressure peak propagation 1 TP Activation Quick oil evacuation generating fast depressurization of the tank (within milliseconds) Template ref: Amxae170329Fe Copyright © S
Slide 8: Explosive gases remain after depressurization
TRANSFORMER PROTECTOR • Electrical arc THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • Pressurized gas bubble • Dynamic pressure peak propagation 1 TP Activation Quick oil evacuation generating fast depressurization of the tank (within milliseconds) • Explosive gases remain • Melting parts
Slide 9: Step 2: Injection of Inert Gas
TRANSFORMER PROTECTOR • Electrical arc THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • Pressurized gas bubble • Dynamic pressure peak propagation 1 TP Activation Quick oil evacuation generating fast depressurization of the tank (within milliseconds) • Explosive gases remain • Melting parts
Slide 10: Transformer safe and ready for repair
TRANSFORMER PROTECTOR • Electrical arc THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • Pressurized gas bubble • Dynamic pressure peak propagation 1 TP Activation Quick oil evacuation generating fast depressurization of the tank (within milliseconds) • Explosive gases remain • Melting parts
Slide 11: Video of TP operation
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION Template ref: Amxae170329Fe Click here to see the video Copyright © STP 2019 During a transformer short circuit, the TRANSFORMER PROTECTOR is activated within milliseconds by the first Doc Reference: AtTPghc16-211027Fe dyna
Slide 12: Physical Explanations and Testing of the TP
TRANSFORMER PROTECTOR TPhysical Explanations and Testing of the TP HE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION Simulation tool – Presentation ✓ During the 62 tests performed, electrical arcs were always ignited inside closed transformer tanks equipped with TP The TP always saved transforme
Slide 13: 7.2 MJ Fault Simulation: Not Protected by TP
TRANSFORMER PROTECTOR 7.2 MJ Fault Simulations in 400 MVA Transformer THE ONLY PROVEN SOLUTION AGAINST Not Protected by TPTRANSFORMER EXPLOSION without TP 1 ms Gas bubble under pressure The first dynamic pressure peak 4 ms propagates Reflects off the walls and 10 ms creates complex pressure waves 50
Slide 14: 7.2 MJ Fault Simulation: Protected with TP
TRANSFORMER PROTECTOR 7.2 MJ Fault Simulations in 400 MVA Transformer THE ONLY PROVEN SOLUTION Aby Protected TPTRANSFORMER EXPLOSION GAINST with TP 1 ms Gas bubble under pressure The first dynamic pressure peak 4 ms propagates The dynamic pressure peak 10 ms activates the TP Rarefaction waves are sp
Slide 15: Pressure comparison without TP and with TP
TRANSFORMER PROTECTOR 7.2 MJ Fault Simulations in 400 MVA Transformer THE ONLY PROVEN SOLUTION Aby Protected TPTRANSFORMER EXPLOSION GAINST without TP with TP AFTER 150 ms 145 Pressure (psi, absolute) 130 116 101 87 72 58 43 29 14 Average Pressure in the tank is over Average Pressure in the tank is
Slide 16: Spatially averaged pressures for 400 MVA transformer, 6.6 MJ
TRANSFORMER PROTECTOR Spatially averaged THE ONLY PROVEN pressures SOLUTION for a 400 AGAINST TRANSFORMER MVA EXPLOSION transformer subjected to a 6.6 MJ Simulation of 4 different cases Transformer 400 MVA Current (Peak) 4.5*103 A Voltage (Peak) 44.5*103 V Frequency 50.0 hz Duration 65 milliseconds
Slide 17: Transformer Protector Benefits
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION TRANSFORMER PROTECTOR Benefits • Financial consequences due to transformer explosion and fire often reach hundreds of EUR millions. • Using the Protection Financial Benefit ratio often used by Corporate Risk Managers and In
Slide 18: Summary: TP track record and installations
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION • The TRANSFORMER PROTECTOR (TP) is activated within 0.5 to 10 milliseconds by the first dynamic pressure peak of the shock wave, avoiding transformer tank rupture before static pressure increases. • The TP can be installed
Slide 19: SERGI Transformer Protector contact details
TRANSFORMER PROTECTOR THE ONLY PROVEN SOLUTION AGAINST TRANSFORMER EXPLOSION http://www.sergi-tp.com/ SERGI Transformer Protector (STP) 48-52 avenue des Châtaigniers, 95150 Taverny, France - Office: (+33) 1 39 22 48 40 Template ref: Amxae170329Fe Copyright © STP 2019 During a transformer short circu
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