# Sanbian 50 MVA 110/35 kV On-Load Tap-Changing (OLTC) Grid Power Transformer

> Sanbian 50 MVA 110/35 kV On-Load Tap-Changing (OLTC) Grid Power Transformer belongs to the Substation Step-Down Power Transformers (110-330 kV) category and is rated at 50 MVA with 110/35 kV primary/secondary voltage. Application: 110 kV Grid to 35 kV Industrial On-Load Regulated Step-Down Transformer. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-SANBIAN-SZ11-50M-110K | Brand: Sanbian Science & Technology | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Substation Step-Down Power Transformers (110-330 kV)

**Voltformer canonical:** https://voltformer.com/product/sanbian-50-mva-110-35-kv-on-load-tap-changing-oltc-grid-power-transformer - markdown version: https://voltformer.com/product/sanbian-50-mva-110-35-kv-on-load-tap-changing-oltc-grid-power-transformer.md

## Overview

Sanbian 50 MVA 110/35 kV On-Load Tap-Changing (OLTC) Grid Power Transformer is intended for 110 kV Grid to 35 kV Industrial On-Load Regulated Step-Down Transformer. Configured electrical data: 50 MVA, 110/35 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNd11 and short-circuit impedance 10.5%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: Ecodesign Tier 2 Compliant. These values support preliminary engineering selection; verify insulation levels, thermal limits, short-circuit duty, installation conditions and applicable standards against the manufacturer datasheet and the site study.

- **Application:** 110 kV Grid to 35 kV Industrial On-Load Regulated Step-Down Transformer
- **Target industries:** Regional Transmission Substations, Mega Industrial Zone Main Infeeds
- **Brand:** [Sanbian Science & Technology](https://voltformer.com/brand/sanbian-science-technology.md) - Manufacturer specialized in 2500 kVA 35 kV Dual LV Solar Pad-Mounted outdoor transformers, 50 MVA 110 kV grid power transformers and amorphous-core ultra-low-loss SCBH15 dry-type transformers.
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [High-Voltage & Transmission Power Transformers](https://voltformer.com/category/power-transmission-transformers.md): 5 MVA–1000 MVA 110 kV, 154 kV, 380 kV, 500 kV and 1000 kV UHV AC/DC transmission and interconnection power transformers. / [Substation Step-Down Power Transformers (110-330 kV)](https://voltformer.com/category/power-transmission-transformers/substation-step-down-power-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 50 MVA |
| Primary / secondary voltage | 110 kV / 35 kV (±8 x 1.25% OLTC) |
| Frequency / phases | 50 Hz / 3-phase - YNd11 |
| Short-circuit impedance (Uk) | 10.5% |
| No-load loss P0 | 29.00 kW |
| Load loss Pk | 185.0 kW |
| Calculated efficiency (power factor = 1) | 99.57% at 100% load; 99.7% at 50% load |
| Loss class | Ecodesign Tier 2 Compliant |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 63 dB(A) |
| Mass and dimensions | 68000 kg - 5800×3600×5100 mm |
| Enclosure | IP55 - wheel gauge: 1600 mm |
| LI / AC withstand | 550 kV peak / 230 kV rms - partial discharge: 5 pC |
| Environment | -25°C / +40°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Direct Copper Busbar Terminals (Busbar Integrated / IP00-IP31) |

## Standards

- IEC 60076
- GB/T 1094
- CE

## Accessories

**Included:** Vacuum OLTC, Buchholz Relay, Oil Level Indicator
**Optional:** DGA Gas Analyzer

## Official sources

- https://www.sanbian.cn/en/

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (On Request) - Indicative range: $360,000 – $430,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, GB/T 1094, CE. Verify applicability and conformity against the exact offered model and project jurisdiction.

## RFQ

Request a formal factory quotation via Voltformer RFQ:

```json
POST https://voltformer.com/api/v1/rfq
{"companyName":"Example Energy","email":"procurement@example.com","items":[{"skuOrId":"VF-SANBIAN-SZ11-50M-110K","quantity":1}]}
```

Full catalog JSON: https://voltformer.com/agent-catalog.json - OpenAPI: https://voltformer.com/openapi.json