SYJZZ OLTC & Transformer — Integrated Core
• Sole voltage-regulating core: the SYJZZ vacuum OLTC is the only tap-changing executive core of this transformer. Mounted directly on the transformer tank cover, its contacts connect the multi-tap points of the HV winding. Without this switch, the transformer loses its on-load regulation capability.
• Dual oil-chamber isolation: the switch has its own sealed oil compartment, fully separated from the main-tank insulating oil. Arc-extinction impurities stay inside the switch oil only and never contaminate the main winding oil — greatly extending the transformer service life.
• Electrical interlocking control: with the matched VQC voltage & reactive power integrated controller, when the LV side voltage deviates from the set value, the controller commands the SYJZZ motor drive to complete a tap change within 3–6 seconds. Gas relay, refusal-to-operate and overcurrent faults can directly trip the transformer protection.
• Tailored structure: the 4000kVA HV winding is specially designed with ±8×1.25% regulation taps; winding insulation and ampere-turn balance are optimized for SYJZZ switching duty, greatly improving surge and short-circuit withstand capability. Ordinary off-circuit tap-changing transformers cannot be retrofitted with this switch.
Design and test standards: GB/T6451-2015, GB1094 and GB10230.
Core Technology & Manufacturing Advantages
Transformer Body Advantages
• Low-loss core system: high-permeability grain-oriented silicon steel, fully automatic 45° step-lap stacking with burr ≤ 0.01mm; multi-stage vibration-damping core clamping — remarkably reduced no-load loss and noise, lower long-term energy cost.
• High-strength oxygen-free copper windings: HV and LV windings use high-purity oxygen-free copper wire in multi-layer cylindrical structure; internal/external insulation spacers fully chamfered to optimize field distribution; ampere-turn balanced design passes national short-circuit withstand tests; whole winding vacuum-impregnated for moisture resistance and low partial discharge.
• Fully sealed anti-leakage tank: heavy-duty steel plate one-piece welding with fully automatic kerosene leak detection; oil-resistant acrylic rubber gaskets stable from -30℃ to +40℃; corrugated/finned radiators with 15% higher heat-dissipation efficiency, suiting both southern heat and northern cold; anti-corrosion epoxy coating available for coastal projects.
• Full standard safety accessories: conservator, pressure relief valve, Buchholz gas relay, oil & winding temperature controller, oil level gauge, dehydrating breather, earthing device, OLTC motor-driven operating box — all standard; optional online oil filtration, partial discharge monitoring and intelligent remote acquisition modules.
SYJZZ Vacuum OLTC Exclusive Advantages (Core Highlights)
• Vacuum-bulb arc extinction, no oil carbonization: high-durability vacuum interrupters confine the switching arc completely inside the vacuum chamber — no carbon particles contaminate the insulating oil. Compared with traditional oil-arc switches, the oil change interval is extended 3 times, drastically cutting maintenance cost.
• Central regulation, balanced field: SYJZZ central-tap design gives uniform winding voltage distribution and extremely low partial discharge, ideal for 35kV medium/high voltage duty; the double-layer clamping moving contact withstands 4kA thermal and 10kA dynamic short-circuit current.
• Independent oil chamber, double protection: the switch cavity is fully isolated with its own gas relay protection; switching faults alarm independently without affecting main transformer operation; mechanical + electronic dual tap-position indication eliminates misalignment and lost steps.
• Fully automatic intelligent control: matched VQC regulator supports local automatic, local manual-motorized and remote control; end-position locking, operation timeout protection, daily operation-count limiting and fault auto-lock functions; manual mechanical regulation available without grid supply for emergency maintenance.
• Easy maintenance for outdoor long-term service: integrated reduction-gear energy-storage mechanism with stainless steel transmission parts; reserved oil filtering/sampling ports on the switch top allow inspection and oil change without lifting the core, minimizing outage time.
Core Technology & Manufacturing Advantages
Transformer Body Advantages
• Low-loss core system: high-permeability grain-oriented silicon steel, fully automatic 45° step-lap stacking with burr ≤ 0.01mm; multi-stage vibration-damping core clamping — remarkably reduced no-load loss and noise, lower long-term energy cost.
• High-strength oxygen-free copper windings: HV and LV windings use high-purity oxygen-free copper wire in multi-layer cylindrical structure; internal/external insulation spacers fully chamfered to optimize field distribution; ampere-turn balanced design passes national short-circuit withstand tests; whole winding vacuum-impregnated for moisture resistance and low partial discharge.
• Fully sealed anti-leakage tank: heavy-duty steel plate one-piece welding with fully automatic kerosene leak detection; oil-resistant acrylic rubber gaskets stable from -30℃ to +40℃; corrugated/finned radiators with 15% higher heat-dissipation efficiency, suiting both southern heat and northern cold; anti-corrosion epoxy coating available for coastal projects.
• Full standard safety accessories: conservator, pressure relief valve, Buchholz gas relay, oil & winding temperature controller, oil level gauge, dehydrating breather, earthing device, OLTC motor-driven operating box — all standard; optional online oil filtration, partial discharge monitoring and intelligent remote acquisition modules.
SYJZZ Vacuum OLTC Exclusive Advantages (Core Highlights)
• Vacuum-bulb arc extinction, no oil carbonization: high-durability vacuum interrupters confine the switching arc completely inside the vacuum chamber — no carbon particles contaminate the insulating oil. Compared with traditional oil-arc switches, the oil change interval is extended 3 times, drastically cutting maintenance cost.
• Central regulation, balanced field: SYJZZ central-tap design gives uniform winding voltage distribution and extremely low partial discharge, ideal for 35kV medium/high voltage duty; the double-layer clamping moving contact withstands 4kA thermal and 10kA dynamic short-circuit current.
• Independent oil chamber, double protection: the switch cavity is fully isolated with its own gas relay protection; switching faults alarm independently without affecting main transformer operation; mechanical + electronic dual tap-position indication eliminates misalignment and lost steps.
• Fully automatic intelligent control: matched VQC regulator supports local automatic, local manual-motorized and remote control; end-position locking, operation timeout protection, daily operation-count limiting and fault auto-lock functions; manual mechanical regulation available without grid supply for emergency maintenance.
• Easy maintenance for outdoor long-term service: integrated reduction-gear energy-storage mechanism with stainless steel transmission parts; reserved oil filtering/sampling ports on the switch top allow inspection and oil change without lifting the core, minimizing outage time.
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