1,000+ Electrical Transformers (7.2–34.5 kV, 25–3000 kVA) — UL Evaluated, Certificate of Compliance Available — In Stock & Ready to Ship from Houston, CA & Florida. Contact Us Today!
Primary Voltage Ratings: 66 kV
Secondary Voltage Ratings: 33 kV
H.V. TAP RANGE: -10 % to +15 %
TYPE: Sealed Power Transformer
Standards: AS
Application: Battery Energy Storage System
Power Rating: 146 MVA
Cooling Method: ONAN
The 146 MVA transformer is specifically engineered for Battery Energy Storage System (BESS) power stations. Designed with a double-split configuration, it mitigates electromagnetic interference and circulating currents, thereby reducing harmonics and enhancing power quality. With an IP56 protection rating, it is suitable for outdoor installation and can operate within a maximum 72.5 kV system.
| Rating | 146 / 73 / 73 MVA |
| Phase | 3 |
| Frequency | 50 Hz |
| Nominal primary voltage | 66 000 V |
| Nominal secondary voltage | 33 000 V / 33 000 |
| Vector group | YN0d11d11 |
| Impedance | 12.0% |
| Operating mode | Duty |
| Location | Outdoor |
| Degree of protection | IP56 |
| Full load temperature rise | 65℃ |
| Mean sound level at 1 metre | 70.2 dB |
| Harmonics compliance | As per design |
Contact Daelim Transformer for special requirements
| System highest voltage – primary | 72.5 kV |
| System fault level – primary | TBC |
| Method of earthing – primary | Solid |
| System Highest Voltage – Secondary | 36 kV |
| System fault level – secondary | 1000 A (TBC) |
| Method of earthing – secondary | Impedance Earthed |
| Core 1 – Differential CT – Set 1 | 300-1000/1A 0.06PX600R3.5 AT 1000/1A |
| Core 2 – Differential CT – Set 2 | 300-1000/1A 0.06PX600R3.5 AT 1000/1A |
| Core 3 – Metering CT | 300-1000/1A 0.5M 15VA |
| Core 4 – Feeder CT – Set 2 | 300-1000/1A 0.06PX600R3.5 AT 1000/1A |
| Core 5 – Feeder CT – Set 1 | 300-1000/1A 0.06PX600R3.5 AT 1000/1A |
| Secondary CT – WTI | As per design |
| Type | OLTC on Primary winding |
| Tapping Range | -10 % to +15 % |
| Principal tap | 66,000 V |
| Number of tap positions | 21 |
| Change per step | 1.25% |
The transformer featuring a sealed tank and layered winding structure crafted from copper, ensures durability and reliability. Equipped with an on-load tap changer at high voltage, it allows for seamless voltage adjustments without interrupting power supply or load equipment operation. With 21 gear settings, each providing a voltage adjustment value of 1.25%, the transformer offers a range of voltage adjustments from -10% to +15% of the rated voltage value, adapting flexibly to line voltage fluctuations.
The transformer is equipped with an externally readable oil level gauge featuring a low oil level alarm and trip mechanism, along with an oil temperature gauge incorporating a high oil temperature alarm and trip function. Additionally, it includes winding temperature RTDs and an oil temperature gauge with winding temperature alarm and trip capabilities. An automatic pressure relief device is also integrated into its design. Moreover, the main oil tank is fitted with a Buchholz relay for enhanced safety and monitoring.
With an A-class insulation level, the primary side of the transformer boasts an insulation level of 72.5 kV (rms), a power frequency withstand voltage of 140 kV (rms), and a lightning impulse withstand voltage of 325 kV. Similarly, the secondary insulation level is rated at 36 kV (rms), with a power frequency withstand voltage of 70 kV and a lightning impulse withstand voltage of 170 kV.
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