The UHF and Pulse Current Partial Discharge Sensor is designed for continuous online monitoring of partial discharge activity in medium- and high-voltage electrical equipment. By integrating Ultra High Frequency (UHF) detection technology with pulse current measurement, the sensor provides comprehensive insight into insulation degradation and potential defects before failures occur.
The sensor captures partial discharge signals across a frequency range of 300–1500 MHz while simultaneously measuring pulse current discharge levels up to 1500 pC. Collected data, including amplitude values, time-domain waveforms, PRPD (Phase-Resolved Partial Discharge) patterns, and PRPS (Phase-Resolved Pulse Sequence) spectra, are transmitted to the monitoring system through an RS485 communication interface.
With high sensitivity, excellent noise immunity, and reliable long-distance communication, the sensor is well suited for condition-based maintenance and predictive asset management in modern power systems.
Key Features
- Real-time online partial discharge monitoring
- Combined UHF and pulse current detection technology
- High sensitivity for early defect detection
- Strong anti-interference capability
- Stable performance in harsh electrical environments
- Long-distance and reliable RS485 communication
- Supports waveform, PRPD, and PRPS analysis
- Suitable for 24/7 continuous monitoring
Applications
- Gas-Insulated Switchgear (GIS)
- Medium-Voltage and High-Voltage Switchgear
- Ring Main Units (RMU)
- Power Transformers
- Power Cable Systems
- Electrical Substations
- Industrial Power Distribution Networks
Technical Specifications
| Parameter | Specification |
| UHF Frequency Range | 300–1500 MHz |
| Measurement Range | 0–75 dBm |
| Measurement Accuracy | ±1.5 dB |
| Average Effective Height | ≥10 mm |
| Detection Sensitivity | ≤6.5 mV/m (17 dBμV/m) |
| Dynamic Range | ≥40 dB |
| Pulse Current Measurement Range | 0–1500 pC |
| Pulse Current Accuracy | ±10 pC |
| Communication Interface | RS485 |
Frequently Asked Questions about UHF and pulse current partial discharge sensor
What is the UHF and pulse current partial discharge sensor used for?
The UHF and pulse current partial discharge sensor 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 this product?
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. This product 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 UHF and pulse current partial discharge sensor powered and how does it communicate?
This product uses the following interface configuration: communication is RS485. 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 UHF and pulse current 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 UHF and pulse current 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.
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.
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.
