Medium-voltage instrument transformers
Capacitive voltage sensor
VSO 25.1
In terms of the development this sensor features a higher level of the original VSO 25 sensor. The operational principle is base on a capacitive divider. Its high voltage (HV) sensing capacity consists of a system of electrodes arranged in a way to reduce the effects of ambient humidity (rain, mist and frost) to 7 %, at the highest. The secondary capacity consists of an output cable delivered usually in the length of 12 m (may, however, be changed).
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Description
In terms of the development this sensor features a higher level of the original VSO 25 sensor. The operational principle is base on a capacitive divider. Its high voltage (HV) sensing capacity consists of a system of electrodes arranged in a way to reduce the effects of ambient humidity (rain, mist and frost) to 7 per cent, at the highest. The secondary capacity consists of an output cable delivered usually in the length of 12 m (may, however, be changed).
The dividers may utilize the capacitive, resistive-capacitive or other type of operating principle, depending on the type of the burden connected to the secondary side and the user application chosen.
The manufacturer verifies the low voltage (LV) output by connecting voltage to resistive load of 1 MΩ (22/√3 kV), in which case the voltage value achieves approx. 100 V.
The sensor is intended for sensing or indication of high voltages ranging from 3 to 22 kV. The creepage distance corresponds to insulation voltage of 25 kV for highest pollution level (31 mm(1 kV).
The device satisfies the insulation and climatic test to CSN EN 61869-3 and GOST 15 150 standards for T1 and UCHL1.
Other engineering parameters can also be agreed, however, in consultations with the manufacturer.
Parameters
- Highest voltage for equipment: 24/25 kV
- Power frequency test voltage: 50 kV
- Lightning impulse test voltage: 125 kV
- Nominal primary voltage: 22/√3 kV
- Nominal secondary voltage: 0–230 V (100 V ±15 % for 1MΩ burden)
- The sensing capacity C1: 25 to 35 pF
- Capacity of shielded terminal at the meter of length C2: 202 pF/m
- Nominal frequency: 50 Hz
- Weight: 6 kg
- Thermal insulation class: E
- Operation conditions: corresponds to temperature class -40/40 according to IEC 61869-1
- Standard: ČSN EN 61869-1, ČSN EN 61869-3, IEC 61869-1, IEC 61869-3, GOST 15 150
Attached files
Drawing
