Product Overview
The HMJ9001-J Ultrasonic Partial Discharge Detector is a portable, non-contact inspection device used to detect and locate partial discharges and other abnormal electrical discharges in high-voltage power equipment. It captures ultrasonic signals generated by corona, arcing, or insulation defects, analyzes them via advanced software, and helps maintenance personnel accurately diagnose potential faults while the system remains energized. This enhances inspection safety, improves detection efficiency, and reduces operational risks.
Key Features
- Detects partial discharge ultrasonic signals and converts them into audible output, waveforms, and dB level readings.
- Safe non-contact inspection under live conditions with a detection range of up to 30 meters.
- Lightweight and easy to operate — ideal for mobile inspections (up to 30 km/h vehicle speed).
- High directional sensitivity enables accurate pinpointing of discharge sources.
Technical Specifications
- Display Resolution: 64 × 48 pixels
- Interfaces: Headphones, USB, Data Port
- Sensor Frequency: 40 kHz (center frequency)
- Audio Recording Time: Adjustable from 1 to 10 seconds
- Volume Control: 30 levels
- Gain Adjustment: 0–80 dB
- Detection Distance: ≤30 meters
- Battery Life: ≥8 hours
- Dimensions: Φ86 × L395 mm
Frequently Asked Questions about ultrasonic partial discharge detector
What is the ultrasonic partial discharge detector (HMJ9001-J) used for?
The ultrasonic partial discharge detector — model HMJ9001-J is designed for periodic live-line partial discharge inspection and fault locating. It is deployed in substations, distribution rooms, cable tunnels and industrial plants, where it gives maintenance teams continuous or periodic visibility of insulation condition so that defects can be identified before they develop into unplanned outages.
Is this detector suitable for periodic inspection rather than permanent monitoring?
Yes. The HMJ9001-J is a portable instrument intended for periodic live-line surveys: an inspector walks the switchgear or cable route, takes readings at defined test points, and compares them against the historical trend for the same point. This approach is the standard complement to permanent online monitoring — it covers a large number of assets at low cost and identifies the few units that justify a permanently installed monitor.
Is installation possible without an outage?
In most cases yes. Because the ultrasonic partial discharge detector 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 ultrasonic partial discharge detector 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 ultrasonic partial discharge detector is used for periodic live-line partial discharge inspection and fault locating. Typical installation sites include substations, distribution rooms, cable tunnels and industrial plants. 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.
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.
Frequently Asked Questions about ultrasonic partial discharge detector
What is the ultrasonic partial discharge detector (HMJ9001-J) used for?
The ultrasonic partial discharge detector — model HMJ9001-J is designed for periodic live-line partial discharge inspection and fault locating. It is deployed in substations, distribution rooms, cable tunnels and industrial plants, where it gives maintenance teams continuous or periodic visibility of insulation condition so that defects can be identified before they develop into unplanned outages.
Is this detector suitable for periodic inspection rather than permanent monitoring?
Yes. The HMJ9001-J is a portable instrument intended for periodic live-line surveys: an inspector walks the switchgear or cable route, takes readings at defined test points, and compares them against the historical trend for the same point. This approach is the standard complement to permanent online monitoring — it covers a large number of assets at low cost and identifies the few units that justify a permanently installed monitor.
Is installation possible without an outage?
In most cases yes. Because the ultrasonic partial discharge detector 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 ultrasonic partial discharge detector 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 ultrasonic partial discharge detector is used for periodic live-line partial discharge inspection and fault locating. Typical installation sites include substations, distribution rooms, cable tunnels and industrial plants. 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.
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.
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