Product Introduction

        NDJBY-III Fully Automatic Relay Protection Calibrator is a newly developed intelligent and multifunctional relay protection calibrator based on the previous NDJBY-II model. This instrument adopts microcontroller technology and consists of an automatic synchronous digital millisecond meter, a logic control unit, a multifunctional digital display unit, a high-precision data acquisition and processing unit, a current and voltage output unit, and overload and over-range protection units. It features built-in printing and display functions, with fully automated testing processes, greatly improving measurement accuracy and work efficiency. The NDJBY-Ⅲ Relay Protection Calibrator is a new generation calibration device successfully developed by our company. Utilizing advanced power supply technology, it simplifies operation and enhances functionality, making it suitable for calibrating conventional relays such as current, voltage, time, intermediate, reclosing, and differential relays. With its attractive appearance, reliable performance, user-friendly operation, and comprehensive functions, it is an ideal instrument for calibrating relays and protection devices.

Product Features

☆、Thanks to the microcomputer control, the panel is equipped with only 16 touch switches, enabling convenient completion of various testing functions. This eliminates the drawback of older relay protection testers that required powering off and switching multiple switches to change power types, making operation simple. The device also includes self-check and error reporting functions, greatly facilitating inspection and maintenance.
☆、The device features comprehensive self-check and self-protection functions. Upon startup, it immediately performs a self-check. In cases of overload or over-range, the protection circuit quickly cuts off the output and provides audible and visual alerts, significantly reducing unnecessary losses caused by misoperation.
☆、The device is highly intelligent; pressing a single key can measure all parameters of general relays and automatically print all data, freeing users from tedious testing operations.
☆、The display screen includes a function display unit, clearly reflecting the device's operating status.
☆、All printed data use Chinese characters, such as "Pick-up Voltage," "Drop-out Voltage," "Normally Open Pick-up Time," etc.

Technical Parameters

☆、AC Voltage Output
      0～250V continuously adjustable, output capacity 600VA, over-range protection 260V, error ±1%.
☆、AC Current Output
      0～50A, 0～100A continuously adjustable, error ±1%.
      At 0～50A, open-circuit voltage 5V.
      At 0～100A, open-circuit voltage 10V. Overload protection trip current 120A.
☆、DC Voltage Output
       0～250V continuously adjustable, current 2A, over-range protection 260V, overload protection trip current 2.1A±5%. Error ±1% 
☆、DC Current Output

      0～200mA?0～5A continuously adjustable, error ±1%.
      At 0～200mA, open-circuit voltage 48V, overload protection trip current 230mA.
      At 0～5A, open-circuit voltage 24V, overload protection trip current 5.2A.
☆、Fixed DC Voltage Output
      When outputting 110V or 220V separately, current can reach 2.5A. However, when output simultaneously with AC voltage/current and DC voltage, the total capacity must not exceed 600VA.
☆、Digital Millisecond Meter
      Range: 999 seconds
      Resolution: 0.1 millisecond
      Accuracy: 0.1% ±1 digit
☆、Meter accuracy uses four-and-a-half-digit A/D conversion, accuracy 0.1% of reading ±1 digit
☆、Overall measurement accuracy: ≤1%
☆、Dimensions: 480×320×310 mm
☆、Weight: 18 kg