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Internal Damped Capacitive Impulse Voltage Divider

Internal Damped Capacitive Impulse Voltage Divider
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Internal Damped Capacitive Impulse Voltage Divider - 1

Damped-Capacitive Impulse Divider Type CR Application The damped-capacitive impulse voltage dividers series CR can be used to measure full lightning impulse voltages, tail chopped impulse voltages, switching impulses and AC voltages. Depending on the voltage rating, the high voltage part of the dividers consists of one or several oil-filled capacitors which are housed in cylinders made from glass fibre reinforced epoxy resin. The damping resistance is inserted between the capacitor elements of the unit and acts as distributed internal resistive element. External damping resistances are used also above 1600 kV (included). Above 1000 kV (included) the dividers are equipped with toroidal HV electrodes to guarantee discharge-free operation. The electrode is designed depending of the rated L.I. and negative S.I. levels. The secondary unit consists of a capacitor and a damping resistor of low inductance both arranged in a coaxial design. The unit is fixed at the bottom of the divider and can easily be exchanged. The voltage divider is erected on a four-arm base equipped with castors. It is designed for indoor design. They meet all requirements of IEC 60060-2 (1994), in particular those with respect to measuring accuracy and step response. Furthermore, all HV tests are carried out in accordance to the applicable IEC 60060-2 requirements (up to the limits imposed by our test system & premises). They can be used as a basic load for impulse voltage generators. The type designation consists of the characters CR and two figures, e.g. CR 1200-700. The first figure indicated the rated L.I. voltage in kV, the second the primary capacitance in pF. Technical Data Type Rated neg. impulse voltage S.I. 250/2500 µs Rated impulse voltage L.I. 1.2/50 µs Rated RMS CapaciAC voltage, tance 50/60 Hz, cont. duty * kV pF * with adequate additional secondary part for AC voltage measurements type SEK W. CR 4000-360 divider Other ratings & positive S.I. level on request. The top electrode can be designed to reach higher S.I. levels.

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Internal Damped Capacitive Impulse Voltage Divider - 2

Dimensions, weights & clearance (approx. values) Height H Shipping volume Clearance to walls and ceiling Top electrodes Made of polished aluminium, the top electrodes are designed in accordance to the required L.I. and neg. S.I. levels, and available clearances. The given data & type are therefore purely informative. Divider Ratio The divider ratio is designed to achieve an output voltage of approx. 1400 V at rated lightning impulse voltage. This value was chosen as the standard input voltage for impulse measuring systems from Haefely Test in order to reduce the influence of electromagnetic...

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