Contact-type Ultrasonic Partial Discharge Sensor

Model:
HMJ1010-WAEA

Product Overview:

The HMJ1010-WAEA Intelligent Contact-type Ultrasonic Sensor is designed to monitor AE ultrasonic signals of partial discharge (PD) in GIS equipment. It integrates a low-power LoRa module, high-precision amplification circuitry, and an industrial-grade lithium battery. This sensor effectively monitors the insulation status of operating equipment, enabling early detection of potential risks to ensure the safe and stable operation of power systems.

 

Key Features:

1、High Sensitivity

Capable of detecting minimal ultrasonic signals generated by early-stage partial discharge, enabling timely detection of potential insulation faults.

2、Strong Electromagnetic Interference Resistance

The ultrasonic-based detection is independent of electrical circuits, ensuring stable operation even in complex electromagnetic environments.

3、Contact Detection Advantage

Direct contact with equipment reduces environmental noise and external interference, ensuring higher accuracy and reliability in PD detection.

4、Adaptability to Various Insulation Materials

Suitable for a wide range of electrical equipment made with diverse insulation materials, including transformers and GIS, without material limitations.

 

Main Parameters:

Item	Technical Parameter
Frequency Range	30kHz–200kHz
Resonant Frequency	40kHz
Sensitivity	≥120dB
Dynamic Range	≥40dB
Communication Protocol	LoRa (wireless), RS485 (wired)
Power Supply	Built-in lithium battery (wireless), DC24V (wired)
Operating Temperature	-40°C to +85°C
Operating Humidity	5%–95% RH

Frequently Asked Questions about contact-type ultrasonic partial discharge sensor

What is the contact-type ultrasonic partial discharge sensor (HMJ1010-WAEA) used for?

The contact-type ultrasonic partial discharge sensor — model HMJ1010-WAEA is designed for continuous online partial discharge monitoring of HV switchgear and cables. It is deployed in HV switchgear, cable terminations, GIS and transformer bushings, where it gives maintenance teams continuous or periodic visibility of insulation condition so that defects can be identified before they develop into unplanned outages.

What is the frequency range of the HMJ1010-WAEA?

According to the published specification, the frequency range is 30kHz–200kHz. This figure is measured under the reference conditions stated in the product datasheet; for project-specific acceptance criteria please refer to the type test report supplied with the quotation.

Which detection principle does this sensor use, and how do I choose?

Different partial discharge defects are best seen with different coupling methods. UHF sensors pick up electromagnetic waves emitted by discharge inside metal-enclosed equipment and give good immunity to corona from outside; HFCT sensors couple to the pulse current flowing on the earthing or cable screen and suit cable and transformer applications; contact ultrasonic and TEV sensors are used for surface and internal discharge in switchgear. The HMJ1010-WAEA listed here applies the principle best matched to its intended installation, and multi-function versions combine several principles in one housing where the defect type cannot be predicted in advance.

How is the contact-type ultrasonic partial discharge sensor powered and how does it communicate?

The HMJ1010-WAEA uses the following interface configuration: communication is LoRa (wireless), RS485 (wired); power supply is Built-in lithium battery (wireless), DC24V (wired). This allows the same device to be fitted in both retrofitted installations and new builds; the exact combination is confirmed at order stage against the site communication architecture.

Is installation possible without an outage?

In most cases yes. Because the contact-type ultrasonic partial discharge sensor is installed on the equipment while it remains energised, the work is normally carried out as a live-line operation by qualified personnel following the site safety rules. Where a sensor must be coupled to an earthed screen, bonded connection or gas compartment, a short outage may be required — this is confirmed during the site survey.

Does HUWOR support OEM/ODM and what is the delivery lead time?

Yes. Zhuhai Huawang Technology Co., Ltd. supplies the contact-type ultrasonic partial discharge sensor under its own brand and also supports OEM/ODM supply, including private labelling, custom firmware functions and integration with the customer’s monitoring platform. Standard units are typically quoted with a lead time confirmed at order stage depending on quantity and configuration; sample and pilot orders are supported.

Applications

The contact-type ultrasonic partial discharge sensor is used for continuous online partial discharge monitoring of HV switchgear and cables. Typical installation sites include HV switchgear, cable terminations, GIS and transformer bushings. It is applied both on new assets, where the monitoring function is built into the asset from the start, and on existing assets where it is retrofitted to extend the information available to the maintenance team.

How it works

The instrument converts the physical quantity of interest into an electrical signal, conditions and digitises that signal in the field unit, and passes the result to the monitoring platform or to the operator. Condition assessment relies on the trend rather than on a single reading: the value recorded today is compared with the commissioning value and with the historical series for the same measurement point, and it is the direction and rate of change that indicate whether the asset is degrading.

Installation and commissioning

Installation follows three steps: a site survey to confirm the mounting position, the communication path and the power arrangement; mechanical fitting of the sensor or the use of the instrument on the test point; and finally commissioning, where the readings are verified against a reference and the alarm thresholds are set.

For this model the relevant interface conditions are: communication LoRa (wireless), RS485 (wired), power supply Built-in lithium battery (wireless), DC24V (wired).

Standards and documentation

Type test reports, calibration certificates and installation documentation are provided with the supply. Where a project requires the equipment to be verified against a specific national or utility standard, the applicable clauses should be stated in the enquiry so that the test scope can be confirmed at quotation stage.