4-in-1 Partial Discharge Monitoring Sensor

Model:
HMJ1010-WGAT

Product Overview:

The HMJ1010-WGAT Smart 4-in-1 Partial Discharge Sensor integrates four advanced detection technologies: Ultra High Frequency (UHF), Ultrasonic (AA), Transient Earth Voltage (TEV), and Temperature & Humidity monitoring. Widely used in substations, switchgear stations, and other critical power environments, it provides comprehensive partial discharge (PD) and environmental monitoring for equipment such as ring main units (RMU), switchgears, and GIS. This ensures early detection of insulation defects and potential hazards, enhancing equipment reliability and operational safety.

 

Key Features:

1、Multi-Parameter Integrated Detection:

Combines UHF, TEV, AA, and temperature/humidity monitoring in a single device. It captures electrical signals, mechanical vibrations, and environmental data, enabling comprehensive analysis for accurate PD diagnosis and insulation assessment.

2、Strong Anti-Interference Capability:

Equipped with advanced filtering and shielding technologies to effectively suppress external electromagnetic interference and noise, ensuring stable and reliable performance even in complex power system environments.

3、Intelligent Diagnosis & Early Warning:

Built-in intelligent algorithms and data analysis modules process real-time data to automatically identify PD characteristics and patterns. It provides predictive diagnostics and early warnings based on preset thresholds, helping prevent insulation failures.

4、Easy Installation:

Designed for convenient installation, typically via magnetic mounting or other simple methods. Installation and maintenance can be performed while equipment remains live, ensuring no disruption to power supply or operations.

 

Technical Specifications:

Parameter	Technical Data
UHF Frequency Range	300–1500 MHz
UHF Measurement Range	-80 to -10 dBm
UHF Equivalent Height	≥10 mm
TEV Frequency Range	1–100 MHz
TEV Measurement Range	0–70 dB
AA Resonant Frequency	40 kHz
AA Measurement Range	-10 to 75 dB
Temperature Range	-40 to 125℃
Humidity Range	0–100% RH
Communication	Wireless: LoRa; Wired: RS485
Power Supply	Wireless: Built-in lithium battery; Wired: DC24V
Operating Temp.	-40 to +85℃
Operating Humidity	5–95% RH

 

Applications:

• Substations
• Switchgear Stations
• RMUs and Switchgears
• GIS (Gas-Insulated Switchgear)

 

Frequently Asked Questions about 4-in-1 partial discharge monitoring sensor

What is the 4-in-1 partial discharge monitoring sensor (HMJ1010-WGAT) used for?

The 4-in-1 partial discharge monitoring sensor — model HMJ1010-WGAT 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 uhf frequency range of the HMJ1010-WGAT?

According to the published specification, the uhf frequency range is 300–1500 MHz. 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-WGAT 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 4-in-1 partial discharge monitoring sensor powered and how does it communicate?

The HMJ1010-WGAT uses the following interface configuration: communication is Wireless: LoRa; Wired: RS485; power supply is Wireless: Built-in lithium battery; Wired: DC24V. 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 4-in-1 partial discharge monitoring 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 4-in-1 partial discharge monitoring 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 4-in-1 partial discharge monitoring 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 Wireless: LoRa; Wired: RS485, power supply Wireless: Built-in lithium battery; Wired: DC24V.

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.