Resistive impulse voltage dividers

APPLICATION
The resistive impulse voltage measuring dividers are used to convert the high
lightning (LI), chopped lightning (LIC) impulse voltages from peak voltages up to 800 kV into a measureable and processable value for a transient recorder or peak voltmeter.
The performance of a resistive divider is mainly determined by the design of the high- voltage circuit.
Dividers are designed to fulfill all requirements of IEC standard 60060-2.

GENERAL DESIGN
The high-voltage branch is made with nickel-chrome wire.
The wire is placed over a fiber-glass cylinders with metal flanges.
The low-voltage branch is located at the lower end of the HV resistive branch.
Its compact and coaxial design and its parallel configuration of low-voltage resistors, provides a very low inductance value and high protection against electrical noise.
The termination resistor for the connection of a 75 Ω measuring cable (triaxial) is included.
The divider has to be connected to a high-impedance measuring system (transient recorder or peak voltmeter ≥ 1 MΩ, ≤ 100 pF).
On the low voltage resistive branch is located the earthing terminal that is realized with 2 metallic plates to optimize the connection to the earth through copper strips.
At the top of the resistive branch there is the top electrode that as standard is realized with a single toroid.
Over the toroid of the top electrode is placed the external damping resistor. The divider can be equipped with additional taps for partial operation.
This item allows the optimum adaptation to the relevant test voltage level.
The top electrode is designed and optimized for the rated voltages and wave shapes.

ROUTINE TESTS AND TYPE TEST
A.M.E. certifies the divider performance by different internal test and calibration procedures according to IEC 60060-2. In addition to the internal test report, A.M.E. can provide an official calibration certificate issued by the RSE calibration laboratory
The RSE calibration laboratory is accredited by the Italian Accreditation Body ACCREDIA.

ELECTRICAL MAIN PARAMETERS

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