The 3370 is a series of SF6 insulated, highly stable capacitors and is used together with a power factor / tan d measuring instrument as a comparison standard for exact measurements of capacitance and tan d of HV equipment like cables, transformers, bushings, capacitors, etc. The capacitors are provided with a top electrode making possible partial-discharge-free interconnections to other elements of the HV circuit. The SF6 insulated standard capacitor is designed for indoor service and is mobile on castors.
The capacitor is built as steel pressure vessel, with bushing for voltages up to 30 kV included. Above this voltage the measuring capacitance Cs is formed by the metallic pressure tank and the corresponding internal concentric electrode.
The electrodes are insulated from each other with SF6 gas. All capacitors are fitted with a pressure indicator and filling valve. Surge arrestors protect the measuring output from transients.

Advantages
• Can be used as references in a variety of climate conditions
• Suitable as references for power factor (tan d) measurements
• Can stay in the circuit during the partial discharge test.
• One capacitor for voltage and tan d (power factor) measurements
• Can be connected to a kilovoltmeter for AC measurement
• Protection from transients

Complimentary component options

• 3723 resistance unit
• SF6 filling device including SF6 filling device with …kg of SF6 and 1 hose connection with adapted fitting
• Set of HV connections type HSEV
• Secondary part for voltage measurements type SEK AC