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Discussion History

On-Load Tap Changer

Assembly

Diverter and selector tap changer that adds or subtracts regulating turns under load to set the phase angle. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

On-Load Tap Changer parts and their functions

9 top-level parts · 38 parts in total · full bill of materials below
On-Load Tap Changer parts diagram: 1 OLTC diverter switch, 2 OLTC tap selector, 3 OLTC reversing selector, 4 OLTC transition resistor, 5 OLTC motor drive unit, 6 servo motor, 7 helical gear pair, 8 OLTC oil compartment, 9 OLTC position indicator. 38 parts in 9 top-level items.
On-Load Tap Changer parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 OLTC Diverter Switch 1× Diverter switch with transition resistors making and breaking load current
2 OLTC Tap Selector 1× Tap selector contacts choosing the next regulating tap
3 OLTC Reversing Selector 1× Reversing (change-over) selector giving advance and retard ranges
4 OLTC Transition Resistor 6× Transition resistors limiting circulating current during switching
5 OLTC Motor Drive Unit 1× Motor drive and gear mechanism rotating the tap shafts
6 Servo Motor 4 parts 1× Motor turning the OLTC drive shaft
7 Helical Gear Pair 2× Step-down gearing between motor and tap selector
8 OLTC Oil Compartment 1× Oil-filled diverter compartment isolated from the main tank
9 OLTC Position Indicator 1× Operation counter and position indicator

3D model

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Build & assembly graph

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Bill of materials for On-Load Tap Changer

9 top-level lines · 20 rows shown · 38 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 OLTC Diverter Switch phase-shifting-transformer-oltc-diverter 1× 1 · part
2 OLTC Tap Selector phase-shifting-transformer-oltc-selector 1× 1 · part
3 OLTC Reversing Selector phase-shifting-transformer-oltc-reversing 1× 1 · part
4 OLTC Transition Resistor phase-shifting-transformer-oltc-resistor 6× 6 · part
5 OLTC Motor Drive Unit phase-shifting-transformer-oltc-drive 1× 1 · part
6 Servo Motor 4 parts servo-motor 1× 1 24 assembly
6.1 Stator Assembly 3 parts stator-assembly 1× 1 3 assembly
6.1.1 Stator Core (laminations) stator-core 1× 1 · part
6.1.2 Copper Winding copper-winding 1× 1 · part
6.1.3 Slot Insulation stator-insulation 1× 1 · part
6.2 Rotor Assembly 4 parts rotor-assembly 1× 1 19 assembly
6.2.1 Rotor Shaft rotor-shaft 1× 1 · part
6.2.2 Rotor Core rotor-core 1× 1 · part
6.2.3 Neodymium Magnet neodymium-magnet 16× 16 · part
6.2.4 Ball Bearing ball-bearing 1× 1 · part
6.3 Encoder encoder 1× 1 · part
6.4 Motor Housing motor-housing 1× 1 · part
7 Helical Gear Pair gear-pair 2× 2 · part
8 OLTC Oil Compartment phase-shifting-transformer-oltc-compartment 1× 1 · part
9 OLTC Position Indicator phase-shifting-transformer-oltc-counter 1× 1 · part

Where the on-load tap changer is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Phase-Shifting Transformer

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳Foxconn
foxconn.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Flex (Singapore)
flex.com ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks
🇮🇳Dixon Technologies
dixoninfo.com ↗ 		Noida, IN Electronics contract mfg 1,000 pcs 6–10 wks
🇨🇳BYD Electronics
bydelectronic.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Venture Corp
venture.com.sg ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks