What Happens When Surge Arresters Are Subjected To Power Frequency Voltage For Extended Periods? You Must Understand These Potential Hazards.

Many people think that 11kv lightning arreaster price is "just installed and that's it", but that's not the case. It's on the line 24/7, constantly subjected to the power frequency voltage. The effective value of the power frequency voltage that can be continuously applied across the metal oxide 11kv surge arrester during operation is one of the fundamental parameters for measuring its stable operation. Once this value is consistently exceeded, the valve plate will slowly "give up"—heating, performance degradation, and eventually, direct damage.

In actual engineering, it's not uncommon for 120 kv lightning arrester equipment to be exposed to overvoltage environments for extended periods due to conservative selection, temporary adjustments to system operation, or delayed disconnection of single-phase ground faults.

Valve plate aging: You can't see it, but it's always happening.

The maximum continuous operating voltage of the metal oxide 12kv surge arrester is usually equal to or greater than the maximum operating phase voltage of the system. Exceeding this limit for an extended period causes the nonlinear characteristics of the surge arrester to irreversibly degrade. This manifests as follows:

• Leakage current subtly increases: Under normal conditions, the surge arrester has high resistance, and the current is negligible. However, under overvoltage, the impedance drops, the current increases, and the temperature rises accordingly.

• Thermal collapse is not an accident, but a chain reaction: heating → impedance drop → increased current → even hotter. Once this cycle starts, it becomes uncontrollable, leading to thermal breakdown.

• Lifespan is quietly shortening: By measuring the leakage current at 0.75 times the DC reference voltage, it can be determined whether the long-term allowable operating current of the 132 kv lightning arrester equipment meets the specifications, thus detecting early signs of degradation. The problem is that many devices only show these signs during routine inspections, when internal degradation has already begun.

A healthy exterior does not mean a healthy interior.

This is a common misconception in maintenance. When the surface of the surge arrester's porcelain bushing is severely contaminated, the voltage distribution becomes extremely uneven, potentially causing the parallel resistor to overheat and burn out. Abnormal vibrations, unusual sounds, or odors should prompt immediate shutdown and inspection.

Simply looking at it isn't enough. The insulation resistance of the metal oxide surge arrester and its base, as well as the DC reference voltage and leakage current, should be measured regularly. For surge arresters equipped with online monitoring instruments, data should be read and analyzed regularly to detect equipment defects early. The data from online monitoring must be actually examined and analyzed; it's not just for show.

The operation and management of surge arresters is far more than a matter of periodically "glancing at it." Selection, continuous operating voltage verification, and monitoring data tracking—every step must be implemented effectively. Feel free to leave a message if you have any specific questions, and let's discuss them together.