Electrical properties of insulating systems change due to age and continuous electrical stress. By measuring electrical properties such as Capacitance and Tan-Delta regularly it is possible to ensure the operational reliability of H.V. insulating systems and to avoid costly breakdowns. This is particularly important for HV bushings, Power Transformers, Generators, Power Capacitors, H. T. cables etc.
Our Manual Capacitance and Tan-Delta Test System (Model HVTD-12/100) has inbuilt HV Power Source, Standard Capacitor (SF6 Gas Filled), and set of cables. The compact design of the system uses the principle of three winding differential transformer on a high permeability mu-metal core to measure the Capacitance of the object and its Tan-Delta value accurately.
The Capacitance & Dissipation Factor (Tan-Delta) Test System is contained in a sturdy metallic housing with mu-metal lining which shields it from external electromagnetic & electrostatic influences. Built-in battery powered Null indicator makes the system suitable for operation in workshop, factories, High Voltage Switch Yards etc. It is suitable for both grounded as well as ungrounded objects. The system is provided with High Voltage Protection Devices which protect the system and operator against failure of test object or standard capacitor.
The system is provided with High Voltage Protection Devices which protect the system and operator against failure of test object or standard capacitor. The other safety features are –
The set consists of heavy shielded HV transformer with required tappings and current ranges with necessary controls and protective circuits, feeding transformer and its guard circuit and auxiliary bridge, all this to eliminate any bit of stray capacitance.
Input power required- 230V AC, 50 Hz± 10% (110V, 60Hz available on special request)
Voltage Range- 0-12kV
Leakage Current- 100mA Continuous 200mA, short term for less than 15 min
Voltage Indication- 3½ digit Digital Panel Meter (DPM)
Resolution- 10 V
Accuracy- ± 1 % of the reading, ± 2 digit
Standard Capacitor- Sf6 Gas filled, 1 00pf ± 1 % , Tan ~ s 1 X 10-4
Modes for testing- UST (Ungrounded Specimen Test) GST (Grounded Specimen Test) GSTg (Grounded Specimen Test