Sphere Gaps

Product Introduction

The sphere gaps can be used for Impulse, AC or DC voltage calibration according to the IEC 60052 recommendation. The sphere-gap presents the undeniable advantage of a direct and

straightforward voltage measurement, where only the sphere diameter and their distance gives a voltage measurement within ± 3 % accuracy.

As both spheres are mounted on columns of insulating material on the horizontal sphere gaps,it’s possible to superimpose impulse, alternating and direct voltages for special tests. For the

chopping of lightning impulses, the sphere gap can be equipped with the optional chopping

device .

Product Features

• Designed for indoor operation. The measuring spheres are made of highly polished copper with small manufacturing tolerances.

• In the horizontal design, they are mounted together with the adjusting gear on supportingcolumns. The adjusting gear consists of a hand~wheel and precision scale for adjustment of the sphere gap (accuracy 0,5 mm).

• The vertical, motorized design includes the sphere drive placed on the base frame. The sphere distance is controlled by the impulse generator controls or by a specific control unit

Technical Parameter

Trigger Device

This triggering device is recommended for chopping lightning impulses on the tail. It is

available for both the vertical and horizontal sphere gaps. This way the chopping system can

be controlled by an electronic triggering device and allows wave~chopping with a maximal dispersion of approx. 0.1 ms. The chopping device requires a power supply of 230 V, 50 or 60 Hz.

The trigger device consists mainly of :

a. Impulse Amplifier with an adjustable delay time between 1 µs - 5 µs, in 8 steps (set byjumpers)

b.Trigger sphere with a built-in ignition rod (this sphere must be exchanged with one of the

measuring spheres for chopping operation).

Sphere Gap Distance Control Unit

This simple control unit is designed for the sphere gap distance measurement & control of

motorized, vertical sphere gaps type HSG V.

It ensures an autonomous setting of the sphere gap distance, independent from the existing

control unit.

The desk top unit contains the power supplies for the sphere gap DC motor drive and the sphere gap distance measuring system. A multiple digit display shows the sphere distance. The distance is adjusted by means of two push buttons.

The control unit also supplies the trigger amplifier of the sphere gap with mains power should the sphere gap be used with the above described chopping device.