APD Partial Discharge Detector for MV Switchgear

Product Overview

The APD series is an intelligent monitoring terminal designed for medium-voltage switchgear insulation safety. By integrating Ultra-High Frequency (UHF), Transient Earth Voltage (TEV), and Acoustic Emission (AE) sensor technologies, it captures partial discharge signals in real-time, identifies insulation risks, and provides early warnings. This enables a shift from reactive maintenance to proactive prevention, ensuring safe, reliable, and continuous power system operation.

Application

Highlight

What’s the Highlight of Acrel APD Partial Discharge Detector for MV Switchgear?

Triple-in-One Sensor

UHF + TEV + AE in one
Covers all discharge types
No need for multiple devices
Accurate fault diagnosis
Integrated reliable design

Flexible Deployment

Wired RS485 connection
LoRa wireless option
Battery-powered model available
Adapts to any site condition
New build or retrofit ready

Magnetic Mounting

No drilling required
Preserves cabinet integrity
Fast, one-person installation
Secure and stable attachment
No equipment downtime

Built for Harsh Environments

-40℃ to +85℃ operation
IP65 protection rating
Withstands dust and sand
High humidity tolerance
Reliable in extreme heat

Network

How does the Acrel APD Partial Discharge Detector for MV Switchgear works?

Working Principle

Method	Core Value	Best For
Ultrasonic (Acoustic Emission, AE)	Pinpoint LocalizationFinds exactly where the discharge is	On-site troubleshooting after alarm
Transient Earth Voltage (TEV)	Quick Screening Easy, non-intrusive check of overall PD activity	Routine monitoring, large-scale surveys
Ultra-High Frequency (UHF)	Deep Diagnosis Identifies defect type (void, surface, etc.)	Critical asset monitoring, failure prediction

UHF = Diagnosis– Tells you what the problem is.
TEV = Screening – Tells you if there is a problem.
AE = Location– Tells you where the problem is.

Function

Feature	Description
Multi-Parameter Monitoring	Monitors discharge amplitude, frequency, environmental noise, temperature, and humidity.
Intelligent Alarm Logic	Dual-criteria logic (amplitude + discharge count) minimizes false alarms from transient interference.
Wireless Communication (LoRa)	Supports LoRa wireless transmission for simplified cabling, with a range of several kilometers.
Wired Communication (RS485)	Supports standard Modbus-RTU protocol for seamless integration into existing power monitoring systems.
Local Data Management	With the ATP series HMI, users can view data, configure parameters, and check alarm records on-site.
Centralized Management	The ATC600 series receivers manage up to 80 sensors, enabling unified monitoring across large facilities.

Specification

Parameters			APD300-L	APD300-W	APD300-WP
Power			DC12-36V	Battery	DC12-36V
Battery life			—	3-4years,replaceable	—
Communication			RS485(MODBUS-RTU)	LORA(506.5Mhz)	LORA(506.5Mhz)
Sampling			4s	2h	15s
PD monitoring sensors	AE	Measuring range	0～60dBμV
		Resonant frequency	40kHz±1kHz
	TEV	Measuring range	0～60dBmV
		Bandwidth	3MHz～100MHz
	UHF	Measuring range	-70～10dBm
		Bandwidth	300MHz～1500MHz
		Average equivalent height	≥10mm
	Environment	Noise measuring range	30dB~130dB
		Temp measuring range	-40℃~85℃
		Humidity measuring range	0～100%RH
Usage environment		Temperature	-40℃~85℃
		Relative humidity	≤95%RH
Size		Terminal form factor	135mm100mm42mm
Installation		Installation	Magnetic

System

FAQ

Got a Question? Get your Answer

Partial discharge is an early indicator of insulation degradation. Left undetected, it can lead to insulation breakdown and equipment failure. The APD series detects these risks early to prevent unplanned outages.

The APD300-WP model uses a high-performance battery. Under standard operating conditions, its battery life reaches 3-4 years and can be easily replaced on-site.

No. The APD series uses a dual-criteria logic (amplitude + count). An alarm is only triggered when discharge signals continuously exceed the set threshold, effectively preventing false alarms.

The APD series supports the standard Modbus-RTU protocol. Whether via RS485 wired connection or through the ATC600 receiver, data can be easily uploaded to your SCADA, DCS, or cloud platform.

Summary

The APD series partial discharge detector offers comprehensive monitoring, flexible deployment, and high environmental adaptability, providing solid protection for the safe operation of medium-voltage switchgear. Whether for new projects or retrofits, complex environments or power-free areas, we can provide the most suitable partial discharge monitoring solution for you.

Contact us today for a customized solution and quote, and ensure the safety and reliability of your power system.

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