Model:
HMJ1010-WCK
Product Overview:
The high-voltage live display partial discharge (PD) terminal is designed to reliably monitor the partial discharge of A, B, and C phase busbars in switchgear and ring main units. The monitoring terminal communicates via RS485 and supports the Modbus protocol, offering strong anti-interference capability, long transmission distance, and stable operation. The PD terminals are typically installed on the exterior of switchgear cabinets or inside relay protection rooms, with each unit connected in series across switchgear intervals.
Key Features:
- Enables online partial discharge monitoring of electrical equipment
- Data transmission via RS485 with Modbus protocol
- Long communication distance with high safety and reliability
- Strong anti-interference and stable performance
- High sensitivity for accurate PD signal detection
Technical Specifications:
| Item | Specification |
| Applicable Ceramic Capacitor Range | 20pF–400pF (≤35kV) |
| Frequency Range | 500kHz–20MHz |
| Measurement Range | 0–67dB |
| Linearity Error | ≤±15% (dynamic range 40dB) |
| PD Detection Range | 10pC–10nC |
| Sensitivity | ≥10pC |
| Power Supply | DC12V or DC24V |
| Communication Method | RS485 |
Frequently Asked Questions about high-voltage live display partial discharge terminal
What is the high-voltage live display partial discharge terminal (HMJ1010-WCK) used for?
The high-voltage live display partial discharge terminal — model HMJ1010-WCK 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 applicable ceramic capacitor range of the HMJ1010-WCK?
According to the published specification, the applicable ceramic capacitor range is 20pF–400pF (≤35kV). 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-WCK 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 high-voltage live display partial discharge terminal powered and how does it communicate?
The HMJ1010-WCK uses the following interface configuration: communication is RS485; power supply is DC12V or 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 high-voltage live display partial discharge terminal 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 high-voltage live display partial discharge terminal 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 high-voltage live display partial discharge terminal 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 RS485, power supply DC12V or 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.
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