Model: HMJ1011-WB
Product Overview
The Smart Lightning Arrester Leakage Current Sensor is a high-precision device designed for measuring microcurrents under high voltage. By monitoring the total leakage current and its resistive component, the sensor provides insight into the operational status of metal oxide arresters (MOAs), enabling early detection of issues such as moisture ingress or aging of the valve blocks. It features high accuracy, high sensitivity, and includes a lightning strike counter function.
Key Features
1.Measures total leakage current, resistive current, and lightning strike count.
2.Supports both local display and remote monitoring modes for user convenience.
3.Utilizes LoRa wireless communication for a fully integrated, cable-free installation.
4.Powered by energy harvesting with ultra-low power consumption, ensuring long product life.
5.Equipped with an LCD screen for real-time display of precise monitoring values.
Technical Specifications
| Parameter | Specification |
| Total Current Measurement Range | 100 μA – 5 mA |
| Total Current Resolution | 1 μA |
| Total Current Accuracy | ± (2% of reading + 5 μA) |
| Resistive Current Measurement Range | 10 μA – 2 mA |
| Resistive Current Resolution | 1 μA |
| Resistive Current Accuracy | ± (5% of reading + 2 μA) |
| Protection Rating | IP68 |
| Communication Protocol | Wireless: LoRa 470 / 2.4GWired: RS485 (optional) |
| Power Supply | Wireless: Self-poweredWired: DC 24V (optional) |
Frequently Asked Questions about surge arrester leakage current sensor
What is the surge arrester leakage current sensor (HMJ1011-WB) used for?
The surge arrester leakage current sensor — model HMJ1011-WB 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.
What is the total current measurement range of the HMJ1011-WB?
According to the published specification, the total current measurement range is 100 μA – 5 mA. 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.
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 (specified here as 10 μA – 2 mA), the HMJ1011-WB detects arrester ageing at an early stage — long before the total current shows a meaningful change.
How is the surge arrester leakage current sensor powered and how does it communicate?
The HMJ1011-WB uses the following interface configuration: communication is Wireless: LoRa 470 / 2.4 GWired: RS485 (optional); power supply is Wireless: Self-powered Wired: DC 24V (optional); the enclosure is rated IP68. 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 surge arrester leakage current 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 surge arrester leakage current 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 surge arrester leakage current sensor 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.
For this model the relevant interface conditions are: communication Wireless: LoRa 470 / 2.4 GWired: RS485 (optional), power supply Wireless: Self-powered Wired: DC 24V (optional).
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 surge arrester leakage current sensor
What is the surge arrester leakage current sensor (HMJ1011-WB) used for?
The surge arrester leakage current sensor — model HMJ1011-WB 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.
What is the total current measurement range of the HMJ1011-WB?
According to the published specification, the total current measurement range is 100 μA – 5 mA. 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.
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 (specified here as 10 μA – 2 mA), the HMJ1011-WB detects arrester ageing at an early stage — long before the total current shows a meaningful change.
How is the surge arrester leakage current sensor powered and how does it communicate?
The HMJ1011-WB uses the following interface configuration: communication is Wireless: LoRa 470 / 2.4 GWired: RS485 (optional); power supply is Wireless: Self-powered Wired: DC 24V (optional); the enclosure is rated IP68. 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 surge arrester leakage current 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 surge arrester leakage current 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 surge arrester leakage current sensor 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.
For this model the relevant interface conditions are: communication Wireless: LoRa 470 / 2.4 GWired: RS485 (optional), power supply Wireless: Self-powered Wired: DC 24V (optional).
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 surge arrester leakage current sensor
What is the surge arrester leakage current sensor (HMJ1011-WB) used for?
The surge arrester leakage current sensor — model HMJ1011-WB 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.
What is the total current measurement range of the HMJ1011-WB?
According to the published specification, the total current measurement range is 100 μA – 5 mA. 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.
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 (specified here as 10 μA – 2 mA), the HMJ1011-WB detects arrester ageing at an early stage — long before the total current shows a meaningful change.
How is the surge arrester leakage current sensor powered and how does it communicate?
The HMJ1011-WB uses the following interface configuration: communication is Wireless: LoRa 470 / 2.4 GWired: RS485 (optional); power supply is Wireless: Self-powered Wired: DC 24V (optional); the enclosure is rated IP68. 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 surge arrester leakage current 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 surge arrester leakage current 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 surge arrester leakage current sensor 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.
For this model the relevant interface conditions are: communication Wireless: LoRa 470 / 2.4 GWired: RS485 (optional), power supply Wireless: Self-powered Wired: DC 24V (optional).
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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