Overview
The APD300-WP is a triple-in-one partial discharge sensor specifically designed for medium-voltage switchgear. It integrates Acoustic Emission (AE), Transient Earth Voltage (TEV), and Ultra-High Frequency (UHF) detection technologies to monitor partial discharge activity inside the cable compartment. Powered by an external DC 12-36V supply, it transmits data via LoRa wireless communication to the ATC600-PD receiver, eliminating the need for additional cabling and simplifying installation. The sensor is mounted via strong magnetic adsorption—no power outage required. With a 15-second sampling cycle, it is ideal for scenarios requiring continuous monitoring where external power is readily available. Built-in environmental sensors (noise, temperature, humidity) and configurable alarm thresholds provide reliable insulation status warnings for power systems.
Highlight
Reliable External Power
- DC 12-36V supply
- No battery replacement
- Continuous 15s monitoring
Multi-Technology PD Detection
- AE/TEV/UHF in one device
- Monitors amplitude & frequency
- Environmental compensation
Long-Range LoRa Communication
- 506.5MHz frequency band
- Works with ATC600-PD receiver
- Supports up to 40 sensors
Robust & Easy Installation
- Magnetic mount, no tools
- Wide temp -40~85℃ operation
- Compact 135×100×42mm size
Function
| AE Monitoring | Measures ultrasonic signals from partial discharges. Range: 0～60 dBμV, resonant frequency 40kHz±1kHz. Provides discharge count, amplitude, and alarm status. |
| TEV Monitoring | Detects transient earth voltage signals. Range: 0～60 dBmV, bandwidth 3MHz～100MHz. Outputs discharge count, amplitude, and alarm. |
| UHF Monitoring | Captures ultra-high frequency electromagnetic waves. Range: -70～+10 dBm, bandwidth 300MHz～1500MHz. Reports discharge count, amplitude, and alarm. |
| Environmental Monitoring | Integrated noise (30～130dB), temperature (-40～85℃), and humidity (0～100%RH) sensors for comprehensive condition assessment |
| Alarm Logic | Alarm triggered when amplitude exceeds preset threshold and discharge count >25. Three independent alarms: AE, TEV, UHF. |
| Wireless Communication | LoRa technology at 506.5MHz, transparent data transmission to ATC600-PD receiver. Each ATC600-PD can collect data from up to 40 APD300-W or APD300-WP sensors |
| External Power Supply | Powered by DC 12-36V via 2-pin terminal (port 1: GND, port 2: V+). No battery maintenance required, suitable for continuous monitoring |
| Sampling Cycle | Factory-set sampling interval: 15 seconds, enabling near-real-time PD detection |
Specification
| Parameter | Value |
| Power Supply | DC 12～36 V (external) |
| Communication | LoRa (506.5MHz), transparent to ATC600-PD |
| Sampling Cycle | 15 seconds (fixed) |
| AE Sensor | |
| – Measuring Range | 0～60 dBμV |
| – Resonant Frequency | 40 kHz ±1 kHz |
| TEV Sensor | |
| – Measuring Range | 0～60 dBmV |
| – Bandwidth | 3 MHz ～ 100 MHz |
| UHF Sensor | |
| – Measuring Range | -70 ～ +10 dBm |
| – Frequency Band | 300 MHz ～ 1500 MHz |
| – Average Equivalent Height | ≥10 mm |
| Environment Sensors | |
| – Noise Level | 30 ～ 130 dB |
| – Temperature | -40 ～ 85 ℃ |
| – Humidity | 0 ～ 100 % RH |
| Operating Temperature | -40 ～ 85 ℃ |
| Relative Humidity | ≤95 % RH |
| Dimensions (W×H×D) | 135 mm × 100 mm × 42 mm |
| Mounting | Magnetic adsorption |
| Protection Grade | IP65 (sensor head) |
| Weight | Approx. 0.5 kg |
| Compatible Receiver | ATC600-PD (supports up to 40 devices) |
| Terminal Wiring | Port 1: Power GND, Port 2: Power V+ |
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FAQ
APD300-WP is powered by an external DC 12-36V supply via terminals, requiring no battery and no maintenance.
The sampling cycle is fixed at 15 seconds, ideal for continuous monitoring requiring fast response. For longer cycles (e.g., 2 hours) to save power, consider APD300-W.
It requires the ATC600-PD wireless receiver. APD300-WP transmits data via LoRa, and ATC600-PD can receive data from up to 40 sensors simultaneously, then upload via RS485 or Ethernet to the monitoring system.
Alarm thresholds (AE, TEV, UHF) can be configured via the ATC600-PD receiver or backend software. When amplitude exceeds the threshold and discharge count >25, the internal alarm flag is set and transmitted wirelessly.
It is ideal for switchgears requiring continuous monitoring with external power available, such as substation cable compartments, industrial distribution rooms, and power plant auxiliary systems. Its 15-second fast sampling enables early detection of insulation defects.
Summary
The APD300-W is a battery-powered wireless partial discharge sensor that integrates AE, TEV, and UHF technologies into a single compact unit. Its magnetic mounting and tool‑free installation enable rapid deployment without power outage, while the replaceable battery ensures 3-4 years of maintenance‑free operation. With a 2‑hour sampling cycle and LoRa wireless communication (506.5MHz), it is ideal for hard‑to‑wire or remote switchgear locations. Data is collected by the ATC600‑PD receiver, which supports up to 40 sensors and provides RS485/Ethernet uplink for SCADA integration. The sensor’s wide temperature range (-40°C to +85°C), IP65‑rated head, and built‑in environmental monitoring (noise, temperature, humidity) make it suitable for harsh industrial environments. By providing early warning of insulation degradation, the APD300‑W helps prevent unplanned downtime and extends equipment life, offering a cost‑effective solution for utilities and industrial facilities seeking reliable partial discharge monitoring without complex wiring.
