A coupling capacitor (C C) is a very common coupling method when performing a PD measurement as described in the IEC 60270 standard. When a partial discharge event occurs, the coupling capacitor provides the devices under test (DUT) with a displacement current, which is measurable at the coupling devices (CPL).
Typically, one coupling capacitor per phase is installed at the phase exits of the machine. For larger machines, it is recommended to install an additional coupling capacitor at the neutral point. High frequency current transformers are commonly used whenever an existing high voltage capacitance is available.
When a partial discharge event occurs, the coupling capacitor provides the devices under test (DUT) with a displacement current, which is measurable at the coupling devices (CPL). Such an approach provides additional information about the test discharge (PRPD) measurement. OMICRON ofers standard coupling capacitors from 12 kV up to 100 kV.
Fit a crossbar in the pit. Fit the stationary part of the auto coupling on top of the crossbar. Fit the adapted piece of pipe for the movable part of the hookup auto coupling to the pump discharge port. Fasten a shackle and a chain to the movable part of the hookup auto coupling. Clean out debris from the pit before lowering the pump.
discharge (PRPD) measurement. OMICRON ofers standard coupling capacitors from 12 kV up to 100 kV. When using a coupling capacitor without an integrated measuring impedance, the low side of the coupling capacitor has to be connected to the input of the CPL measuring impedance (basic test setup with measurement on ground potential).
Sparks Instruments coupling capacitors are designed for heavy industrial environments and meet international safety standards, such as creeping distances, impulse lightning, and over voltage width. They have quadrupole build-in at the bottom and over voltage protection for instrument and personnel safety. These coupling capacitors are designed for the function.