Problems with outdoor power lines usually leave clues—typhoons can snap wires, and lightning strikes can burn out insulators, making the fault points visible to the naked eye. However, the situation is exactly the opposite for indoor electrical distribution rooms: with their dense concentration of equipment, crisscrossing wires, and enclosed spaces, faults often develop without anyone noticing.
Statistics from the power operations and maintenance sector show that more than 60 percent of incidents in distribution rooms stem from internal equipment malfunctions rather than external impacts. Among these, overheating is the most common hazard. Long-term oxidation of switch contacts and gradual loosening of wiring terminals—these subtle changes do not immediately trigger a trip, but they cause contact resistance to rise continuously, leading to a gradual increase in temperature. If the distribution room has poor ventilation, is damp, or has accumulated dust, heat dissipation conditions worsen further, potentially causing insulation to carbonize or circuits to short-circuit, which in severe cases can directly lead to an electrical fire.
The second major category of problems is closely related to the environment. Once water seeps into or condensation forms in a power distribution room, the insulation performance of the equipment rapidly deteriorates, increasing the risk of ground faults and flashover discharges. Dust accumulation on heat sinks and insulated surfaces not only hinders heat dissipation but also alters the surface potential distribution, creating latent defects. Furthermore, since the protection parameters of some older distribution panels have drifted, protective devices may not operate correctly when a fault occurs. Failure to trip when necessary or false tripping when it is not required can both cause minor issues to escalate into major accidents.
This is precisely the core challenge of power distribution room operations and maintenance: potential hazards are invisible and intangible, and manual inspections—limited by their frequency and coverage—make it difficult to detect faults in their early stages.
Acoustic partial discharge monitoring technology offers a non-contact solution. Partial discharge is an early indicator of insulation degradation in high-voltage equipment, and the discharge process generates acoustic waves within specific frequency bands. Dinsee Smart Technology’s Visual Acoustic Partial Discharge Intelligent Inspection System DX-PDS100-SW is based precisely on this principle: it employs a 128-channel microphone array, combined with visible-light video and acoustic fingerprint recognition algorithms, to capture partial discharge acoustic signals in real time while the equipment is energized, and uploads the data to the monitoring platform via an edge computing gateway.
The system consists of two components. The wall-mounted terminal is permanently installed in the electrical distribution room, where it continuously monitors the equipment’s acoustic discharge status and environmental conditions; the 4G mobile gateway supports flexible deployment, and data is uploaded to the cloud in encrypted form, allowing users to view it via a mobile app or PC software. Compared to traditional temperature measurement and inspection methods, the key advantages of acoustic monitoring are that it requires no power outage, involves no physical contact with the equipment, and can issue early warnings before discharge signals develop into visible faults.
In settings such as residential areas and industrial facilities—where uninterrupted power supply is critical—it is more effective to pinpoint the location of a fault and address it promptly at the earliest signs of an anomaly rather than rushing to repair it after a failure has occurred. This shift from “reactive response” to “proactive early warning” represents a technological transformation currently taking place in the operation and maintenance of indoor electrical distribution rooms.
