Overview
CBMV transformer containers are built to specifications to connect to 1 to 4 BESS containers. It includes:
The main transformer - three-phase double winding 10kV~35kV Oil immersed type transformer with optional integrated oil pool/recovery system.
Switch cabinet with 4 LV Automatic circuit breakers + 1 MV Circuit breakers and Power Distribution system.
200kVA Auxiliary Transformer to provide auxiliary power to its controller and to the 4 BESS containers (each requiring a maximum of 44 kVA).
Integrated Smart Energy Meter, UPS, SPD.
We provide 2 variants: 3300kVA, 6600kVA for 2, 3 or 4 units of 20C1600K.
For systems installed starting January 2026, we have a new version with SF6 free switchgears. This is available for order starting August 2025..
Specifications
Overview
Model | CBMV3300K | CBMV6600K |
Rated power | 3300kVA | 6600kVA |
Transformer type | Oil-Immersed | Oil-Immersed |
LV/MV voltage | 0.69kV/10kV ~ 35kV | 0.69kV/10kV ~ 35kV |
Transformer vector | Dy11 – y11 | Dy11 – y11 |
Rate grid frequency | 50Hz/60Hz | 50Hz/60Hz |
Protection
AC input protection | ACB (1,600A/3P)×2 | ACB (1,600A/3P)×4 |
Transformer protection | Oil-temperature | Oil-temperature |
AC MV output protection | MV Vacuum circuit breaker | MV Vacuum circuit breaker |
General
Ingress protection rating | IP54 - C5M | IP54 - C5M |
Auxiliary power supply | Standard: 100kVA | Standard: 200kVA |
Operating temperature | -40~+60°C | -40~+60°C |
Relative humidity | 0~95% | 0~95% |
Max. altitude | 1,000m | 1,000m |
Cooling type | ONAN | ONAN |
Communication port | Ethernet Modbus | Ethernet Modbus |
Dimensions (W*D*H) | 6,058x2,438x2,591mm | 6,058x2,438x2,591mm |
Weight (kg) | ＜16T | ＜25T |
Standard compliance | IEC 62271-202, EN 50588-1, IEC 60076, IEC 62271-200, IEC 61439-1 | IEC 62271-202, EN 50588-1, IEC 60076, IEC 62271-200, IEC 61439-1 |
Inrush current
Inrush current i the high current that a transformer draws when it is first energized. This current is caused by the sudden change in magnetic flux in the transformer's core, and is proportional to the current flowing through the primary winding of the transformer.
model | CBMV3300K 20kV | CBMV6600K 20kV |
rated current | 95.26A | 190.53A |
inrush current factor | 5.19 | 5.12 |
Inrush current | 494.5A | 975A |
Decay time | 252ms | 256ms |
Transformer connection options
The CBMV6600K can be connected to either:
two or four containers with one or two containers per transformer side.
three containers with one container on one side and two containers on the other loop. This is a special configuration available on demand.