[PDF] METROSIL FOR USE WITH ELECTROMAGNETS

These magnets, with ratings of tens of kilowatts, possess considerable stored magnetic energy, and it is therefore essential to provide a discharge resistor to

[PDF] Series and Parallel Experimenting with Electromagnets

Instead, they functioned only as resistance, admitting more (parallel) or less (series) current into the small electromagnet's windings

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To measure the magnetic field of the electromagnet take out the Hall Probe (InAs) from the jacket/ compartment of Gaussmeter and push back the SS cover 3 Push

[PDF] EXPERIMENT 13 – THE INVESTIGATION

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[PDF] METROSIL FOR USE WITH ELECTROMAGNETS

86778_3Metrosil_for_Electromagnets.pdf Large electromagnets are extensively used in steel works, foundries, etc., for the handling of iron and steel. Power is fed to the magnets through trailing cables from a control box. These magnets, with ratings of tens of kilowatts, possess considerable stored magnetic energy, and it is therefore essential to provide a discharge resistor to absorb this energy when the magnet is switched o?. It is usual for the discharge resistor to be situated in the control box with the rest of the control gear. Lifting magnets are often subjected to rough treatment and it is not uncommon for the cable to be broken. If this happens while it is switched on, the magnet is deprived of its discharge resistor and the final result is a breakdown of the magnet insulation, followed by a costly re-wind.

WHY METROSIL?

A special range of Metrosil discharge resistors, intended for mounting on the magnet itself, have been designed. These resistors are not intended to replace the metal linear discharge resistor in the control box; their purpose is to protect the magnet in the event of cable breakage. Of robust construction, they are permanently connected across the magnet coil and, due to their non-linear characteristics; their power consumption is negligible. Extensive tests and many years of service have shown that these units will provide ample protection against voltage surges caused by cable breakage. They will also o?er protection against surges caused by contact bounce as the contactor closes (the metal resistor is not in circuit at this time). Similarly, protection is given if the supply should, for any reason, be interrupted before the control gear has time to operate. The table above shows a list of recommended types of Metrosil assemblies for di?erent magnet ratings at 220/250V smooth dc. For di?erent supply voltages and other applications, please contact us.

METROSIL

FOR USE WITH ELECTROMAGNETS

Magnet RatingMetrosil TypeMax. Voltage

on Discharge

Up to 8 kW600A/S1/60101250V

16 kw600A/US2/P/60141250V

24 kw600A/US3/P/60041250V

32 kw600A/US4/P/60321250V

40 kw600A/US5/P/63141250V

48 kw600A/US6/P/61381250V

Figure 1 - Typical Outline Drawing

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