Location History:
- Corsham, GB (1981 - 1988)
- Swindon, GB (1990 - 1998)
Company Filing History:
4 out of 1,200 
2 out of 28 
1 out of 51,901 
Years Active: 1981-1998
Title: The Innovations of Allan Thomas Johns
Introduction
Allan Thomas Johns is a notable inventor based in Swindon, GB. He has made significant contributions to the field of power transmission, holding a total of 8 patents. His work focuses on methods for detecting faults in power lines and determining the position of faults, which are critical for maintaining the reliability of power transmission systems.
Latest Patents
One of his latest patents is a method of locating the position of a fault on a power transmission line. This method involves calculating the complex fault impedance at various assumed fault positions along the line. By utilizing measurements of voltage and current before and after a fault occurs, along with the line's parameters, he can identify the actual fault position where the complex fault impedance argument is closest to zero. This method is applicable to both single and multi-phase power transmission lines. Another significant patent involves a system for detecting faults in power lines. This system includes a first circuit that attenuates signals within a specific frequency band while allowing signals outside this band to pass through. A second circuit extracts signals within a frequency band that includes the first frequency, enabling the detection of faults based on the relative levels of the extracted signals.
Career Highlights
Throughout his career, Allan has worked with prominent organizations such as the National Research Development Corporation and Gec-Alsthom Limited. His experience in these companies has allowed him to develop innovative solutions that enhance the efficiency and safety of power transmission systems.
Collaborations
Allan has collaborated with notable individuals in his field, including Michael A. Martin and Raj K. Aggarwal. These collaborations have contributed to the advancement of technology in power transmission and fault detection.
Conclusion
Allan Thomas Johns is a distinguished inventor whose work has significantly impacted the field of power transmission. His innovative patents and collaborations demonstrate his commitment to improving the reliability and safety of electrical systems.