Overview
The APD300-W is a triple-in-one wireless 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 circuit breaker or cable compartment. Powered by a long-life battery (3-4 years, replaceable), it transmits data via LoRa wireless communication to the ATC600-PD receiver, eliminating the need for cabling and simplifying installation. The sensor is mounted via strong magnetic adsorption—no power outage required. With a 2-hour sampling cycle, it is ideal for unattended or hard-to-wire locations. Built-in environmental sensors (noise, temperature, humidity) and configurable alarm thresholds provide reliable insulation status warnings for power systems.
Highlight
True Wireless Operation
- Battery powered, no cabling
- 3-4 years battery life
- Replaceable battery design
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 |
| Battery Management | Powered by internal replaceable battery (3-4 years life). ON/OFF button for power control, with LED indicators for run status and battery level. |
| Sampling Cycle | Factory-set sampling interval: 2 hours, balancing power consumption and monitoring continuity. |
Specification
| Parameter | Value |
| Power Supply | Internal battery, 3-4 years life, replaceable |
| Communication | LoRa (506.5MHz), transparent to ATC600-PD |
| Sampling Cycle | 2 hours (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) |
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FAQ
APD300-W is powered by an internal replaceable battery with a lifespan of 3-4 years (depending on environment), requiring no external power supply.
It requires the ATC600-PD wireless receiver. APD300-W 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.
The sampling cycle is fixed at 2 hours to maximize battery life. For more frequent monitoring, consider APD300-WP (15s sampling, external power) or the wired APD300-L.
It is ideal for switchgears where cabling is impractical or power outage is difficult, such as retrofitting old substations, temporary monitoring, or remote sites. Its wireless design and long-life battery reduce installation and maintenance costs.
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.
