Grounding resistance is the resistance encountered in buildings, transmission towers, microwave towers, and lightning rods that allows strong currents to flow into the ground through grounding devices and spread further away. It is a very good protective measure. Therefore, when undergoing lightning protection testing, grounding resistance also becomes one of the testing contents. So, in the process of conducting lightning protection testing, what methods do professional testing companies usually use to detect grounding resistance? Below, the editor of graphite grounding will lead everyone to understand it together.

1. Voltammetric detection method

The editor in charge of graphite grounding has learned that this is one of the common detection methods used by professional lightning protection detection companies. When using the volt ampere detection method, lightning protection personnel will first estimate the magnitude of the current and select an insulated wire with an appropriate cross-sectional area. During the preliminary test, the current will be adjusted through a variable resistor r. When conducting the formal measurement, the variable resistor will be short circuited, and the grounding resistance will be calculated based on the values obtained from the ammeter and voltmeter. However, due to external interference, this method is usually used to detect grounding resistance in low voltage areas.

2. Measurement instrument detection method

The editor of graphite grounding reminds everyone to use professional measuring instruments to detect grounding resistance, which can obtain more accurate data. Therefore, professional lightning detection companies will equip relevant equipment, such as single (double) jaw grounding resistance testers. By using this professional measuring instrument for lightning protection detection, personnel can measure the grounding resistance of various grounding devices. This detection method can eliminate signal interference at a certain frequency during use, resulting in less external interference and more accurate measurement data. Therefore, it can effectively ensure the repeatability and stability of grounding resistance measurement values.

Both of the above methods are commonly used grounding resistance detection methods by lightning protection detection companies. The editor in charge of graphite grounding reminds everyone that generally speaking, the volt ampere detection method is simple but not suitable for ground resistance detection in high voltage areas. Therefore, reputable lightning protection detection companies usually have professional measuring instruments available. In situations where volt ampere detection is not suitable, these professional testing instruments will be used to effectively detect ground resistance to ensure stable and accurate measurements.