An electrical ground that has good contact with the earth should have low resistance. Dry soil, corroded terminals or an uprooted stake may cause the resistance of the ground connection to increase. When this happens, the monitoring circuits may malfunction and not be able to protect the electrical system in case of a fault. There is also a high risk of personnel getting electrocuted when an insulator opens, therefore, it is a good idea to regularly measure the resistance of the electrical ground to ensure continuous operation of the electrical facility.
The 2, 3 or 4 wire method is a commonly utilized method of measuring resistance. However, this method can be timely and demands more effort as it is necessary to use multiple leads spaced properly to measure resistance. The multiple wire method also uses bulky test equipment which can be difficult to transport, especially in the field.
Protec offers an extensive line of Megger ground testers that can assist in the maintenance and troubleshooting of ground connections. The DET family of ground testers offers a comprehensive testing solution for ground rod and soil resistivity diagnostics.
Megger DET24C Ground Resistance Tester
An advanced clamp-on tester that sets the standards in terms of access, performance, features, simplicity of operation and safety.
Megger DET4TCR2 Ground Resistance Test Kit
A rechargeable battery powered 4-terminal tester with selectable test frequencies, greater measurement sensitivity and attached rod technique and stakeless measurement capability.
Megger DET62D Ground Resistance Test Kit
A fully automatic, three terminal instrument built into a rugged, water resistant case giving protection for outdoor use.
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