Surge Arrester Monitor Calibrator 1000kV Class DC Monitor 0-30mA 55Hz Output 0.001mA Resolution | XHJS401A

The Surge Arrester Monitor Calibrator is designed specifically to cater to the requirements of DC-type arrester monitors (e.g., Model JCQ(WZ)-16) in power systems. This equipment is primarily applied to calibrate arrester monitors of the 1000kV class, ensuring that the on-line leakage current readings and action counter records provided by the monitors are accurate and trustworthy. Regular calibration of arrester monitors is an important part of preventive maintenance, because an inaccurate monitor may fail to reflect the real condition of the zinc oxide arrester and can delay the discovery of internal defects before the thunderstorm season.

To calibrate an on-line arrester monitor, the operator connects the calibrator to the current loop of the monitor and selects the output current range matching the monitor rating, from 0-5mA up to 30mA. The calibrator then injects a standard 55Hz sine wave signal, and the value shown on the monitor is compared with the known output to verify measurement accuracy. For the action counter, an instantaneous inrush current of 50A to 100A together with a DC inrush voltage of 1500V or 1800V is applied to trigger the counting mechanism, and the action count is checked in a cyclic rhythm of 1-2 seconds per action. Because the whole process runs on the built-in battery, the calibration can be performed directly at the installation site, which is especially valuable for 1000kV-class monitors distributed across wide substation and plant areas before the annual thunderstorm season.

On-line monitors can drift in accuracy over long service periods, and an inaccurate monitor may fail to reflect the real condition of the arrester. Regular calibration ensures the leakage current readings and action counts are reliable before each thunderstorm season.

It is designed for DC-type arrester monitors such as the Model JCQ(WZ)-16 series, primarily for the calibration of 1000kV-class arrester monitors, with customizable output current ranges of 0-5mA, 10mA and 30mA.

The calibrator generates an instantaneous inrush current of 50A to 100A together with a DC inrush voltage of 1500V or 1800V to trigger the counting mechanism, and verifies the action count in a cyclic mode of 1-2 seconds per action.

Yes. In the online state, the heterodyne output possesses high anti-interference performance, so the calibration can be carried out reliably without disconnecting the monitor from the live system.

It is equipped with a built-in 10.4Ah 12V battery, and outputs a standard 55Hz sine wave with a current accuracy of 0.5% plus or minus 3 digits and a resolution of 0.001mA, making it easy to operate at the installation site.