scholarly journals Test equipment and its effect on the calibration of instrument transformers

2018 ◽  
Vol 7 (1) ◽  
pp. 339-347
Author(s):  
Enrico Mohns ◽  
Peter Räther
Keyword(s):  
Uncertainty Budget ◽  
Current Transformer ◽  
National Standards ◽  
Test Equipment ◽  
Management Systems ◽  
Testing Instrument ◽  
Quality Management Systems ◽  
Ratio Error ◽  
Instrument Transformers ◽  
A Current

Abstract. State-approved test centres in Germany supplying accuracy tests for instrument transformers must, in the future, provide measurement uncertainty budgets for their quality management systems. In this work, the cause of ratio error and phase displacement of instrument transformers are therefore discussed. The traceability to the national standards of PTB, the attainable uncertainty, and the permitted error limits of test equipment for testing instrument transformers are presented. Finally, an example of an uncertainty budget for a current transformer of the class 0,2 S is given.

The Impact of Quality Standards on the Business Performance of Small, Medium and Micro-Sized Enterprises in Kwazulu-Natal: Selected Cases in the Durban Metropolitan Area

2021 ◽  
Author(s):  
Phindile B. Chili ◽  
Noluthando S. Matsiliza
Keyword(s):  
Quality Management ◽  
Small Business ◽  
South African ◽  
Business Performance ◽  
Quality Standards ◽  
National Standards ◽  
Management Systems ◽  
The South ◽  
Quality Management Systems ◽  
Small Business Performance

In the last decade, scholars showed an interest in alluding to compliance as a necessity to support small business performance in the last decades. Over the years, organisations have been frequently criticised for failing to comply with the quality standards such as the South African National Standards (SANS) 9001/ISO 9001 require effective implementation of Quality Management Systems and SANS 342, which provides specifications for diesel fuel products. Quality standards matrix adopted by the South African Bureau of Standards (SABS) is frequently used as a set of detailed specifications, requirements, various guidelines and characteristics to assure that the product, service or process is fit for purpose. Even though public and semi-autonomous institutions understand the value of subscribing and complying with quality standards, there is still a gap in the literature regarding the enforcement and compliance of quality standards in small business practices. There is a relationship between the adoption of quality standards and business excellence. Government can tap on the competitiveness of small, medium and micro-sized enterprises (SMMEs) and address their challenges and barriers that limit SMMEs to acquisition and compliance of statutory quality management systems.

Ratio Error Reduction of a Current Transformer Using Multiple Winding Technique

2019 ◽  
Vol 14 (2) ◽  
pp. 645-651
Author(s):  
Seung-Jae Lee ◽  
Hyun-Kyo Jung ◽  
Tae-Kyung Chung ◽  
Yoon-Sun Lee ◽  
Jong-Suk Ro
Keyword(s):  
Current Transformer ◽  
Error Reduction ◽  
Ratio Error ◽  
A Current

scholarly journals Calibration of a Digital Current Transformer Measuring Bridge: Metrological Challenges and Uncertainty Contributions

Metrology ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 93-106
Author(s):  
Guglielmo Frigo ◽  
Marco Agustoni
Keyword(s):  
Ad Hoc ◽  
Uncertainty Budget ◽  
Current Transformer ◽  
Point Of View ◽  
Generation Process ◽  
Main Challenge ◽  
Instrument Transformers ◽  
Conventional Instrument ◽  
Technical Specifications ◽  
Commercial Device

In this paper, we consider the calibration of measuring bridges for non-conventional instrument transformers with digital output. In this context, the main challenge is represented by the necessity of synchronization between analog and digital outputs. To this end, we propose a measurement setup that allows for monitoring and quantifying the main quantities of interest. A possible laboratory implementation is presented and the main sources of uncertainty are discussed. From a metrological point of view, technical specifications and statistical analysis are employed to draw up a rigorous uncertainty budget of the calibration setup. An experimental validation is also provided through the thorough characterization of the measurement accuracy of a commercial device in use at METAS laboratories. The proposed analysis proves how the calibration of measuring bridges for non-conventional instrument transformers requires ad hoc measurement setups and identifies possible space for improvement, particularly in terms of outputs’ synchronization and flexibility of the generation process.

Quality management in medical laboratories

2010 ◽  
Vol 30 (02) ◽  
pp. 55-62
Author(s):  
M. Fritzer-Szekeres
Keyword(s):  
Quality Management ◽  
Medical Laboratory ◽  
Management Systems ◽  
The European Union ◽  
Quality Management Systems ◽  
Iso 17025 ◽  
Iso 15189 ◽  
Medical Laboratories ◽  
Systems Quality ◽  
Standard Iso 15189

SummaryDuring the 20th century understanding for quality has changed and international and national requirements for quality have been published. Therefore also medical branches started to establish quality management systems. Quality assurance has always been important for medical laboratories. Certification according to the standard ISO 9001 and accreditation according to the standard ISO 17025 have been the proof of fulfilling quality requirements. The relatively new standard ISO 15189 is the first standard for medical laboratories. This standard includes technical and management requirements for the medical laboratory. The main focus is the proof of competence within the personnel. As this standard is accepted throughout the European Union an increase in accreditations of medical laboratories is predictable.

REGULARITIES OF THE PREPARATION OF RUSSIAN ENTERPRISES FOR CERTIFICATION OF COMPLIANCE WITH ISO 9000 SERIES

2019 ◽  
Vol 6 (3) ◽  
pp. 54-60
Author(s):  
Mikhail Jurievich Rudiuk ◽  
Anastasiia Vladislavovna Gerasimova ◽  
Ekaterina Mikhailovna Pomozova
Keyword(s):  
Quality Management ◽  
Iso 9000 ◽  
World Market ◽  
Practical Significance ◽  
Management Systems ◽  
Quality Management Systems ◽  
Strict Adherence ◽  
The World ◽  
Legislative Framework ◽  
Current Stage

The authors' task was to analyze the development of quality management systems at the current stage in Russia, as well as at the previous stage in the USSR. As a result, we came to the conclusion that the factors stimulating the implementation of ISO 9000 standards are the need to promote products on the world market, as well as the possibility of receiving orders from the state. In the future, strict adherence to these standards will allow enterprises to significantly reduce the likelihood of lawsuits from consumers, which is important in the context of the development of the legislative framework and increased control over the business. The practical significance of the article is the possibility of familiarizing management and personnel with quality services, whose task is to prepare for certification for compliance with ISO 9000 standards in how this process took place in other companies. The originality of this work is to summarize the experience of implementation of ISO 9000 standards at enterprises and to analyze the factors contributing to or hindering this process.

Sign in / Sign up

Export Citation Format

Share Document