What is an On-Load Tap Changer (OLTC) and why are vacuum interrupters required?

The On-Load Tap Changer (OLTC) is an electromechanical system that changes power transformer winding taps under load, without circuit interruption . Vacuum interrupter tubes extinguish the arc formed during tap change. Modern systems prefer vacuum: no oil contamination, silent operation, much longer life (1M cycles), environmentally friendly, maintenance-free.

Why is 1 million mechanical cycle life so important?

OLTC operation profiles are intensive: city distribution transformers do 5-15 daily tap changes, industrial 20-50, renewable energy 30-100. 30-year service life requires 100 changes/day × 365 × 30 = 1,095,000 cycles. GLVAC's 1 million mechanical cycle capacity provides 30-year maintenance-free service even in the busiest OLTC operations. Oil-insulated OLTC requires maintenance after 100,000-200,000 cycles.

Difference between 1M and 300K-400K cycle TJ tap-changer models?

Mechanical cycle count depends on rated current/voltage: 1,000,000 cycles (TJ-1.14/80G, TJ-1.14/160L, TJ-1.5/400G) — Longest life in low-mid current class. 400,000 cycles (TJ-2/400, TJ-4/600) — Mid current/voltage class. 300,000 cycles (TJ-12/400A) — High voltage class (12 kV). Higher voltage/current models use more hardened contact and mechanism design.

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GLVAC Vacuum Interrupter for Tap Changer

1.14-12 kV on-load tap changer (OLTC) core component for power transformers — 1 million cycle life

The GLVAC TJ Series tap changer vacuum interrupter tubes are vacuum interrupters specially designed for On-Load Tap Changer (OLTC) operation in power transformers.

Very high mechanical life — 1,000,000 cycles — 30-year life required
Soft arc extinguishing
High insulation class
Low noise

6 models in 5 voltage classes.

Typical customers: power transformer manufacturers (especially OLTC integrated transformers), OLTC module manufacturers, and grid equipment contractors.

Power transformer OLTC modulesGrid voltage regulation systemsIndustrial facility transformer tapWind/solar energy output transformer regulationDistribution transformer OLTC integration

01type: OLTC çekirdek bileşeni vakum kesici tüpü
02frequency: 50/60 Hz
03Current Range: 80 A – 600 A nominal
04mechanical life: 300.000 – 1.000.000 çevrim ⭐
05voltage classes: 1.14 / 1.5 / 2 / 4 / 12 kV (5 sınıf)
06withstand voltage: 10 – 42 kV (1 dakika güç frekansı)

Vacuum Interrupter for Tap Changer Series Contactor Models

Sorted by current rating (150A → 1000A)

6 MODELS

MODEL↑ current	mechanical life	rated current a	rated voltage kv	short time withstand	withstand voltage kv
TJ-1.14/160L	1000000	160	1.14	1.28 kA/10s	10
TJ-1.14/80G	1000000	80	1.14	0.64 kA/10s	10
TJ-1.5/400G	1000000	400	1.5	3.2 kA/10s	10
TJ-12/400A	300000	400	12	6 kA/10s	42
TJ-2/400	400000	400	2	4 kA/4s	20
TJ-4/600	400000	600	4	6 kA/4s	20

TECHNICAL DIFFERENTIATORS

Why KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series?

03 · CATEGORIES

Vacuum Insulation Advantages (OLTC)

No oil contamination
→ Transformer oil quality preserved.
Silent operation
→ Eco-friendly beside transformer.

Renewable Energy Compatibility

Wind/solar variable generation
→ Supports frequent tap changes.
OLTC 100 daily changes
→ Covered by 1M cycles.

1 Million Mechanical Cycle Life ⭐

TJ-1.14/80G, 160L, 1.5/400G — 1 million cycles
→ 30 years intensive OLTC operation.
Industry-unique level
→ 5-10x oil-insulated OLTCs.

DATASHEET · GUIDE · APPLICATION NOTE

KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series — Technical Resources

06 · FILES

TJ-1.14/80G Datasheet

TJ-1.14/80G DatasheetSOON

TJ-1.14/160L Datasheet

TJ-1.14/160L DatasheetSOON

TJ-1.5/400G Datasheet

TJ-1.5/400G DatasheetSOON

TJ-2/400 Datasheet

TJ-2/400 DatasheetSOON

TJ-4/600 Datasheet

TJ-4/600 DatasheetSOON

TJ-12/400A Datasheet

TJ-12/400A DatasheetSOON

FREQUENTLY ASKED QUESTIONS

About the KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI series

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RELATED INSIGHTS · KADEME-DEGISTIRICI-ICIN-VAKUM-KESICIREF · IMB · PUB · 03 ENTRIES

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RELATED INSIGHTS

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03 ENTRIES

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GLVAC Vacuum Interrupter for Tap Changer

Why KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series?

Vacuum Insulation Advantages (OLTC)

Renewable Energy Compatibility

1 Million Mechanical Cycle Life ⭐

KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series — Technical Resources

TJ-1.14/80G Datasheet

TJ-1.14/160L Datasheet

TJ-1.5/400G Datasheet

TJ-2/400 Datasheet

TJ-4/600 Datasheet

TJ-12/400A Datasheet

About the KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI series

Go deeper

OLTC (Yüklü Kademe Değiştirici) Sistemleri ve Vakum İzolasyon

Yenilenebilir Enerji Bağlantı Trafosu OLTC Tasarımı

Güç Transformatörü Bakım Stratejisi: Vakum OLTC Avantajı

GLVAC Vacuum Interrupter for Tap Changer

Why KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series?

Vacuum Insulation Advantages (OLTC)

Renewable Energy Compatibility

1 Million Mechanical Cycle Life ⭐

KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI Series — Technical Resources

TJ-1.14/80G Datasheet

TJ-1.14/160L Datasheet

TJ-1.5/400G Datasheet

TJ-2/400 Datasheet

TJ-4/600 Datasheet

TJ-12/400A Datasheet

About the KADEME-DEGISTIRICI-ICIN-VAKUM-KESICI series

01What is an On-Load Tap Changer (OLTC) and why are vacuum interrupters required?

02Why is 1 million mechanical cycle life so important?

03Difference between 1M and 300K-400K cycle TJ tap-changer models?

Go deeper

OLTC (Yüklü Kademe Değiştirici) Sistemleri ve Vakum İzolasyon

Yenilenebilir Enerji Bağlantı Trafosu OLTC Tasarımı

Güç Transformatörü Bakım Stratejisi: Vakum OLTC Avantajı