High Voltage Capacitor Online Monitoring Terminal

Model: HMJ1011-IA1

 

Product Overview

The HMJ1011-IA1 High Voltage Capacitor Online Monitoring Terminal is engineered to provide accurate, real-time monitoring of high-voltage capacitor operational parameters such as voltage and current. It enables timely detection of abnormal conditions including overvoltage and overcurrent, offering fault warnings, data collection, and transmission functionalities. This solution enhances capacitor reliability and lifespan, supporting stable reactive power compensation and voltage regulation in power systems.

 

Key Features

• High Accuracy & Reliability: Utilizes advanced sensor technology and signal processing algorithms to ensure precise and dependable measurements.
• Wide Measurement Range: Compatible with capacitors of various voltage ratings and capacities, adapting to diverse applications.
• Compact & Integrated Design: Lightweight and small form factor facilitates easy installation and maintenance.
• Strong Anti-Interference Capability: Operates reliably in complex electromagnetic environments without being affected by external disturbances.

 

Technical Specifications

Parameter	Specification
Voltage Imbalance	0.2–10 V ±0.2%
Three-Phase Voltage	2–10 kV ±0.2%
Capacitor Current	30–200 A ±0.2%
Capacitance	15–50 μF ±0.5%
Operating Temperature	-45℃ to 85℃
Operating Humidity	5% to 95% RH

Frequently Asked Questions about high-voltage capacitor online monitoring terminal

What is the high-voltage capacitor online monitoring terminal (HMJ1011-IA1) used for?

The high-voltage capacitor online monitoring terminal — model HMJ1011-IA1 is designed for continuous online monitoring of metal-oxide surge arrester condition. It is deployed in substations, switching stations and transmission line towers, where it gives maintenance teams continuous or periodic visibility of insulation condition so that defects can be identified before they develop into unplanned outages.

Why monitor resistive leakage current instead of total leakage current?

Total leakage current flowing through a metal-oxide surge arrester is dominated by the capacitive component, which changes very little as the valve blocks age. The resistive component is small but it is the part that increases when the blocks absorb moisture or deteriorate. By separating and tracking the resistive component, the HMJ1011-IA1 detects arrester ageing at an early stage — long before the total current shows a meaningful change.

Is installation possible without an outage?

In most cases yes. Because the high-voltage capacitor online monitoring 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 capacitor online monitoring 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 capacitor online monitoring terminal is used for continuous online monitoring of metal-oxide surge arrester condition. Typical installation sites include substations, switching stations and transmission line towers. 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.