No Load Excitation Oil Immersed Transformer Manufacturers – Off-Circuit Tap Supply
Subian Electric manufactures oil immersed transformers with no-load (off-circuit) tap changers – units that let operators adjust the ratio to match supply conditions when the transformer is de-energised. Our 50,000-square-metre factory in Xuzhou, China, has served 50+ countries since 2019.
As a factory-direct manufacturer and supplier, we build no-load tap changing units from 30 kVA to 63000 kVA with factory pricing and complete documentation.
Send your voltage, capacity and tap range. Our export team will respond with a quotation and technical proposal.
2019年以降 · 50,000m² · 350人以上のスタッフ
No Load Tap Changing Oil Immersed Transformers We Manufacture
Oil immersed distribution transformers with off-circuit (DETC) tap changers from 30 kVA to 63000 kVA, with tap ranges confirmed on drawings before production.
What Is a No Load Excitation Oil Immersed Transformer?
A no load excitation (off-circuit) tap changer adjusts the transformer ratio manually while the unit is de-energised, allowing the voltage to be matched to local supply conditions. It is the economical standard for distribution transformers where voltage is stable.
Off-circuit tap changers are specified across distribution networks where voltage variation is limited. The tap position is set during commissioning and rarely changed, keeping the transformer simple and reliable.
- Off-circuit tap changer – DETC design, ratio adjusted when de-energised.
- 30 kVA – 63000 kVA – complete distribution capacity range.
- 6-132 kV class – voltage classes for grid and industrial duty.
- 50,000m²工場 – in-house winding, vacuum drying and testing.
- 350人以上の従業員 – engineering, production and export teams.
- OEM / ODM & 卸売 – カスタムブランディング、パッケージング、ボリューム供給。.
Main Types of Tap Changing Oil Immersed Transformers
We build two tap changer configurations:
No-load (off-circuit) tap changer
Manual ratio adjustment while de-energised – the economical standard for distribution.
Fixed ratio with DETC
A small number of tap positions for fine voltage matching during commissioning.
No Load Tap Changing Transformer Specifications
| パラメータ | 仕様 |
|---|---|
| 定格電圧 | 6 kV – 132 kV class |
| 定格容量 | 30 kVA – 63000 kVA |
| Tap changer | DETC, ±2×2.5% typical |
| 周波数 | 50/60 Hz |
| 冷却 | ONAN / ONAF |
| 標準 | IEC 60076 / GB 1094 |
Manufacturing No Load Tap Changing Transformers
From winding with tap leads to vacuum drying, oil filling, assembly and testing – every unit is built and tested at our Xuzhou facility.
OEM/ODM & Wholesale Supply of Tap Changing Transformers
Distributors can brand or resell units with custom nameplates, packaging and documentation.
OEM / ODM
工場直送
当社の標準プラットフォームに基づいて構築されたカスタムブランディング、パッケージング、製品バリアント – 名札から完全な製品設計まで。.
カスタム名札 · カスタムパッケージ · 完全な試験書類
卸売供給
ボリューム価格
柔軟なコンテナ数量、コンテナごとの混合モデル、ボリュームバイヤーおよび輸入業者向けの信頼できるグローバル配送を伴う工場価格。.
コンテナMOQ · 混合モデル · グローバル配送
ディストリビューターサポート
チャンネルパートナー
ディストリビューターおよびプロジェクトクライアント向けの専任アカウント管理、技術文書、優先生産。.
アカウントマネージャー · 販売資料 · 優先リードタイム
No Load vs On Load Tap Changing Transformers
No-load tap changers are simpler, cheaper and more reliable – the right choice where voltage is stable. On-load tap changers adjust under load for networks with significant voltage variation.
We build both; the selection follows your network’s voltage profile and operational requirements.
Choosing a No Load Tap Changing Transformer Manufacturer
Tap winding quality and connection integrity are the details that matter – verify test evidence and production process control.
Subian Electricは、50,000m²の工場、350人以上の従業員、ISO9001、CEおよびUL認証を提供し、50か国以上に輸出しています。.
Request a quotation with your voltage, capacity and tap range – we confirm the design before production.
認証 & 品質保証
Our no-load tap changing transformers are produced under ISO9001, ISO14001 and ISO45001 management systems, with CE and UL certification and type test reports.
製品認証
No Load Excitation Transformer FAQ
Answers to the questions buyers ask most about off-circuit tap changing transformers.
無負荷タップチェンジャーとは何ですか？
When should I choose a no-load tap changer?
What tap ranges are available?
Can the tap be changed after installation?
What is excitation in a transformer?
最小注文数量とは何ですか？
Contact Subian
Need the Right Specification?
Tell us your target market, product type, quantity and technical requirements. Our team will help you identify a suitable configuration for your project.