Leakage current analyser for surge arrestors
26 June 2013
Test & Measurement
Test Instruments Africa has launched SCOPE’s SA 30i leakage current meter to the South African market. It is a state-of-the-art, on-line test system for residual life assessment of surge arrestors that measures and directly displays the values of resistive and total leakage current.
The instrument can be pre-loaded with the identity (asset number, make, year, serial number etc.) and tests conducted on the arrestor with the same ID are saved under its own folder. Sadata trend analysis software picks up this data and files it in a similar fashion on a PC. This analysis software enables the user to take a decision to repair or replace the arrestors, while considering safety limits.
The SA 30i is designed to work under the hostile electrostatic noise found in live EHV switch yards. A built-in temperature measurement facility enables calculation of temperature compensated leakage currents. Results are displayed on an LCD, printed on an optional thermal printer and up to 1000 test records can be stored (with date and time stamp) in memory.
A special low-noise clamp-on current transducer is used to read leakage current in the earthing conductor of the arrestor. The field probe is a non-contact, remote sensing device employed to take the reference signal from the HV line to the arrestor, for measurement of phase and system harmonics.
Measurement accuracy is ±5% and resolution is 1 mA for both resistive and total currents, over a range from 100 mA to 10 mA for total leakage current, 1 mA to 10 mA for resistive leakage current and 10 mA to 1 mA for field probe current.
The meter is powered by rechargeable SLA batteries and can perform testing for a day on a single charge. It features a standard built-in calibration source and self-calibration check facility. A USB port is used to transfer data to a PC and Windows-based data management software.
For more information contact Justin Clarkson, Test Instruments Africa, +27 (0)11 608 8541, [email protected], www.testinstrumentsafrica.com
Further reading:
Real-time monitoring for smart power distribution
CST Electronics
Test & Measurement
By leveraging high-precision measurement, high-speed wave-recording, and AI-enabled analytics, the InHand Wireless Overhead-lines System empowers power utilities to accurately identify line faults and perform comprehensive load analysis.
Read more...
Compact vector network analyser
Vepac Electronics
Test & Measurement
Siglent Technologies has introduced the SNA5000X-E Vector Network Analyzer, a compact, cost-effective solution engineered to meet essential RF testing needs, while maintaining dependable performance.
Read more...
Smart digital fibre sensor
Avnet Abacus
Test & Measurement
Panasonic Industry Europe has introduced the new FX-250 digital fibre sensor designed to support users in their daily working routines as effectively as possible.
Read more...
Compact USB spectrum analyser solution
Vepac Electronics
Test & Measurement
The HAROGIC SAN Series USB Spectrum Analyser is a compact USB-based spectrum analyser and receiver that covers a broad frequency range from 9 kHz up to 9 GHz.
Read more...
B&K Precision’s Series 1820B frequency counter
Comtest
Test & Measurement
These compact and versatile instruments are designed for a wide range of frequency measurement applications, from telecommunications to verification and validation of oscillators.
Read more...
How transition-edge sensors detect microwave radiation
Test & Measurement
The elegant interplay of superconductivity, thermal physics, and precision electronics makes TES technology a cornerstone of modern low-energy photon detection.
Read more...
Compact high precision magnetometer
Future Electronics
Test & Measurement
Bosch Sensortec has introduced the BMM350, a compact 16-bit, 3-axis magnetometer engineered to deliver high accuracy, low noise, and exceptional energy efficiency in space constrained designs.
Read more...
Ultra compact NTC thermistors
RS South Africa
Test & Measurement
Murata Manufacturing Co. has expanded its compact NCU03 series of NTC thermistors with two ultra-small 0603M devices tailored for consumer and automotive designs.
Read more...
Omniflex uses LoRaWAN to track water usage
Omniflex Remote Monitoring Specialists
Test & Measurement
Omniflex has helped New South Wales Ports improve its ability to track water usage by installing remote monitoring to 38 water meters at its Port Kembla site, sending the data to the NSWPorts web portal.
Read more...
Surviving the extremes: Understanding shock and vibration in MEMS sensors
Altron Arrow
Editor's Choice Test & Measurement
By considering factors such as mechanical headroom, damping, and system-level robustness, designers can ensure that the chosen sensor not only survives, but performs reliably over time.
Read more...
printer friendly version