Medium-voltage instrument transformers
Capacitive voltage sensor
VSO 38.1
The sensor is a capacitive divider. High-voltage capacity consists of special electrodes embedded in epoxy casting material. Low voltage capacity is a capacity output cable. It comes in a length of 12 m (length can be customized, but it is necessary to realize the effect of the total cable length to nn capacity and output voltage).
As acceptance secondary voltage 138 V was chosen to load 1MOhm. The voltage can be adjusted by additional capacity according to user requirements. Output cable is protected by a built-in switching spark gap 470 V levels.
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Description
The VSO 38.1 sensor is an innovated version of the original VSO 38 type. The design improvement lies in the climatic resistance of the transmission accuracy. It is defined for freshwater rain and fog up to 1 % and for the coastal area up to 2 %.
The sensor is a capacitive divider. High-voltage capacity consists of special electrodes embedded in epoxy casting material. Low voltage capacity is a capacity output cable. It comes in a length of 12 m (length can be customized, but it is necessary to realize the effect of the total cable length to nn capacity and output voltage).
As acceptance secondary voltage 138 V was chosen to load 1MOhm. The voltage can be adjusted by additional capacity according to user requirements. Output cable is protected by a built-in switching spark gap 470 V levels.
The sensor is designed for outdoor environment with the greatest pollution (ie. 31 mm/kV to 38.5 kV).
Other technical parameters can be consulted with the manufacturer.
Other electronic devices such as RTU can also be used to measure accuracy.
Parameters
- Highest voltage for equipment: 36/38.5 kV
- Power frequency test voltage: 70/80 kV
- Lightning impulse test voltage: 170/180 kV
- Nominal primary voltage: 35/√3 kV
- Nominal secondary voltage: 0-140 V (110 V ±15 % pro zátěž 1MΩ)
- The sensing capacity C1: 30–35 pF při 50 Hz
- Capacity of shielded terminal at the meter of length C2: 280 pF/m
- Nominal frequency: 50 Hz
- Weight: 9 kg
- Thermal insulation class: E
- Operation conditions: corresponds to temperature class -40/40 according to IEC 61869-1
- Standard: ČSN EN 60044-2, IEC EN 60044-2, ČSN EN 61869-1, ČSN EN 61869-3, IEC EN 61869-1, IEC EN 61869-3
Drawing
