For long-distance equipment such as cables and GIS, the dual-end positioning accuracy is typically required to be ≤1 meter. Under laboratory conditions, the PDL-8100 partial discharge detector achieves a measured positioning error of ≤0.8 meters. The device's time synchronization error is ≤10 nanoseconds, and the sampling rate is 200 MS/s, allowing it to resolve the time difference between two adjacent discharge pulses and thereby calculate the discharge source location. For short cables (length <100 meters), single-end positioning accuracy can reach ±0.5 meters. These parameters provide a clear quantitative basis for design and selection, avoiding the expansion of maintenance scope caused by ambiguous positioning.
The device employs a combined UHF and ultrasonic detection method. The UHF channel has an average equivalent height of ≥12 millimeters, and the ultrasonic channel has a center frequency of 40 kHz. The minimum detectable discharge amount is 5 picocoulombs under laboratory calibration conditions, with a dynamic range of 60 dB. This indicator means that in the strong electromagnetic interference environment of a substation, it can still capture initial weak discharge signals. The device has a built-in adaptive filtering algorithm that can suppress periodic interference such as from mobile phones and radio, improving the signal-to-noise ratio by approximately 20 dB. For design and selection personnel, attention should be paid to the relationship between sensitivity indicators and on-site background noise. It is recommended to measure the background noise level on site before selection.
The PDL-8100 provides 2 UHF input channels, 2 ultrasonic input channels, and 1 high-frequency current transformer input channel. Data storage uses a solid-state drive with a capacity of 128 GB, capable of continuously recording raw waveforms for 72 hours. Communication interfaces include Gigabit Ethernet, USB 3.0, and RS-485. The device supports the IEC 61850 protocol, facilitating integration into substation automation systems. These interface designs reduce the need for additional protocol converters and lower system integration complexity.
The operating temperature range is -20°C to 55°C, relative humidity ≤95%, and protection rating IP54. Power supply is AC 220 V ±10% or DC 110 V to 220 V, with power consumption ≤35 W. The device weighs 4.2 kg and has dimensions of 320 mm × 260 mm × 120 mm, suitable for on-site handheld or fixed installation. For high-altitude areas (altitude >2000 meters), derating is required; refer to the product manual for specific derating coefficients.
Suitable for partial discharge detection and positioning of power cables, GIS, transformers, and switchgear at voltage levels from 6 kV to 500 kV. At locations prone to insulation defects such as cable joints and terminations, the dual-end positioning method can be combined to quickly determine the discharge location. For equipment in operation, it is recommended to conduct a detection every quarter and establish a discharge amount trend file.
