1. RBM
Outdoor Bulk metering unit
Oil immersed
Catalogue
11kV,….33kV ONLY
2002/7
Rockwell Transformer Co., Ltd.

2. 1. General
The outdoor metering unit of type RBM are intended for outdoor installation for metering power grid. The
products mainly consists two parts, combined transformers and watt-hour meter there. The former is made
up to two or three single-phase voltage transformer and current transformer, which adopts 25# transformer
special oil as insulation medium and whose primary and secondary line ends are both installed one panel
by porcelain bushing.
Watt-hour meter tank is fixed on the flank of combined transformer and comprises one active metering
meter and reactive KWH meter, which has high precision measurement, light weight, convenient and low
lose functions.
This outdoor power metering unit is applicable to 3 phase and 50Hz, 6kV up to 40.5kV power grid.
The products are widely compliance with relating IEC/ANSI internationalstandard.
2. Using condition
Ambient temperature: -40℃~+85℃, day temperature difference:25℃；
Altitude:≤3000m area;
Wind speed no exceeds 35m/s;
No normally intensity vibration
No intensity erosion gas, medium place (for example acid, alkali, smother eg.)
Pollution class: IVclass;
Charge temperature -40℃~+85℃。
3. Technical parameter
VT accurate
Durban (VA)
CT accurate
Durban (VA)Type
Voltage
Ratio
(kV)
Current
Ratio (A)
Frequency
(HZ)
CL0.2 CL0.5 CL0.2 CL0.5
Insulation
level (kV)
RBM-11 11/0.11 5-300/5(1) 50 25 25 10 10 11/42/75/95
RBM-33 33/0.11 5-300/5(1) 50 50 50 10 10 33/95/185/200
4. Wiring principle

3. 5. External form diagram of electric meter tank
11/15kV metering unit
30/33kV metering unit
Best solution for your power!