Q: How is a partial discharge detector applied in on-site substation inspections?
A: According to the detection sensitivity requirements of GB/T 7354—2018 "High-voltage test techniques—Partial discharge measurements," the pulse current method can achieve 0.02 pC to 0.1 pC under laboratory conditions. In actual inspections, portable devices must balance sensitivity and interference immunity. The PD-8800 adopts multiple detection methods including the pulse current method, UHF, TEV, and HFCT, and its built-in battery supports single-person handheld operation. It is suitable for live detection and periodic inspections of switchgear, GIS, transformers, and other equipment in substations, helping operation and maintenance personnel identify insulation defects.
Q: How does the device ensure data validity during live detection of outdoor lines?
A: The outdoor electromagnetic environment is complex, so the device requires filtering and shielding design. The PD-8800 provides multiple filter levels that can be adjusted according to on-site noise levels; the UHF sensor frequency band covers 300 MHz to 1.5 GHz, the TEV sensor measurement range is 0 to 60 dBmV, and the HFCT sensitivity is ≤5 pC, adapting to different equipment types. The operation interface guides parameter settings, reducing human error.
Detection channels: 2/4 channels optional; pulse current method sensitivity 0.1 pC; UHF detection sensitivity ≤1 pC; TEV measurement range 0 to 60 dBmV; HFCT detection sensitivity ≤5 pC; battery endurance ≥8 hours; storage capacity supports ≥1000 data sets. The device weighs approximately 1.5 kg and has a protection rating of IP54.
If the device cannot be powered on, first check the battery voltage and test with a replacement adapter; if it still does not work, contact after-sales service. If the screen is black, try a forced restart. If data is abnormal, confirm whether the sensor connection is secure. For daily maintenance, regular calibration is recommended, and the device should be kept dry and clean.
