NDDR-H Fully Automatic Capacitance and Inductance Tester

Product Introduction

       With the development of China's power industry, capacitor compensation devices have experienced unprecedented growth. However, this has been accompanied by a significant increase in capacitor accident rates, including serious group injury incidents. To prevent accidents involving shunt capacitors and ensure the safe and reliable operation of the power grid, the State Grid Corporation formulated the "Measures to Prevent Accidents in High-Voltage Shunt Capacitors." It explicitly states the need to "regularly measure the capacitance of individual capacitors in capacitor banks, recommending the use of measurement methods without disconnecting wiring to avoid faults such as bushing oil leakage caused by stress during disassembly and reassembly."

       This instrument is designed to address issues encountered during on-site measurement of high-voltage shunt capacitor banks in substations. It is developed in accordance with national standards such as GB3983.2-1989 "High-Voltage Shunt Capacitors," DL/T840-2003 "Technical Conditions for High-Voltage Shunt Capacitors," and JB5346-1998 "Series Reactors." It is primarily used for measuring high-voltage shunt capacitor banks and reactors in reactive power compensation devices.
       The instrument utilizes a new generation of high-speed hybrid microprocessors, highly integrated, to synchronously collect voltage and current signals from the test object, automatically calculating values such as capacitance, inductance, and reactive power. On-site capacitor measurement does not require disconnecting wiring, simplifying the testing process, effectively improving work efficiency, and avoiding damage to power equipment. After testing, it automatically calculates the capacity of each phase capacitor and other parameters, making it easy to identify quality changes in capacitors and connection conductor faults between devices. Additionally, the instrument features data storage and USB communication functions, eliminating the need for on-site data transcription and ensuring the integrity of measurement data.

Product Features

☆、No-Disconnection Testing: The instrument is equipped with high-precision current clamps for large currents, allowing on-site capacitor measurement without disconnecting wiring, simplifying the testing process, effectively improving work efficiency, and avoiding damage to power equipment.
☆、High Intelligence: After three-phase testing is completed, it automatically calculates parameters such as capacitance per phase and total capacitance, reactive power, etc., making it simple and intuitive, reducing the burden on testers.
☆、Four-Terminal Measurement: Utilizes four-terminal measurement technology for accurate measurements and good test repeatability.
☆、Automatic Compensation: Current is automatically segmented and compensated, with full-range linearization, enhancing the instrument's measurement accuracy.
☆、Storage Function: The instrument stores 400 data entries and features historical data query functionality.
☆、USB Communication: USB communication function, combined with PC software, enables data analysis, storage, printing, and generation of comprehensive test reports, facilitating centralized data management.
☆、Large Touchscreen: 7-inch large true-color touch LCD display, with Chinese interface, intuitive and easy to operate.
☆、Temperature Monitoring: Monitors ambient temperature, facilitating the recording of capacitor values at different temperatures.

Technical Parameters

☆、Ambient Temperature: -10℃～+40℃

☆、Relative Humidity: ≤90%

☆、Power Supply: AC220V±10%  50Hz

☆、Capacitance Range: 0.02μF～2000μF Accuracy: ±0.5%   

☆、Inductance Range: 0.1mH～2000H  Accuracy: ±0.5%

☆、Reactive Power Range: 0～20MVar  Accuracy: ±1.0%

☆、Active Power Range: 0～20kW Accuracy: ±1.0%

☆、Loss Factor Range: 0～20%  Accuracy: ±1.0%

☆、Resistance Component Range: 0～10MΩ Accuracy: ±1.0%

☆、Main Unit Dimensions: 400×290×175mm (L×W×H)      Weight: 9.5kg

      Accessory Case Dimensions: 340×260×135mm (L×W×H) Weight: 3.6kg