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Notas técnicas sobre mediciones

 

Los equipos Megger son útiles en una gran variedad de aplicaciones a través de la grandes, medianas y pequeñas infraestructuras  eléctricas en multitud de sectores de la industria. Por lo tanto provee de variadas notas técnicas, acerca de dónde y cómo utilizar nuestros equipos y superar los obstáculos con los que se pueda encontrar así como también recomendar acciones que aseguren un continuo, seguro y fiable suministro eléctrico. Ingenieros y técnicos alrededor del mundo creen y confían en nuestros equipos para llevar a cabo su trabajo diario.

Si desea consultar nuestras notas técnicas, no lo dude, puede hacerlo ahora mismo o cuando quiera. Incluso puede descargarlas para leerlas con más tranquilidad en los momentos que le sean mas convenientes. En este caso todas las detalladas debajo están escritas en Inglés. Dispondrá de ellas en Español en breve.

Elija lo que más le interesa aquí:

Comprobación de Baterías

 

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Testing for ground faults on storage batteries

Identifying faults in storage batteries can be problematic. Using a test signal frequency in the range 20 Hz to 30 Hz can minimise interruption from ‘phantom’ faults in batteries.

The batteries that radar UPS systems depend on need regular testing to ensure that the skies stay safe

Batteries play a crucial role in ensuring that air traffic control systems around the world can continue to operate reliably and safely even if there is a failure of the mains supply at the radar stations on which they rely. It is imperative, therefore, that those batteries should be maintained in good condition, with potential problems detected and remedied before they can develop into outright failures.

Using battery test equipment with asset management software

Lost data records can be a problem for major power utilities. Using the right test equipment with modern asset management software can help to ensure that consumers are never without power.

Ensayo y diagnóstico de cables

 

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Experiencias en diagnóstico de DP en España

La experiencia recogida durante diversas mediciones en campo y la visión global del mercado eléctrico, nos permite decir que, por ahora, el diagnóstico de descargas parciales off-line es la mejor técnica de medida eléctrica para optimizar y exprimir las redes eléctricas de cables subterráneos.

 

La medición de descargas parciales que evita pérdidas millonarias

En esta nota podrá conocer cómo, el equipo de ingenieros de "Koopmann Energie- und Elektrotechnik" junto con el experto equipo técnico de Megger, han podido resolver con éxito, una situación de emergencia gracias a los sistemas Centrix y TDS NT de Megger para mediciones y diagnóstico de averías en cables.

No more cable cutting errors - Westnetz Case Study

Positive cable identification with suitable devices prior to work on underground cables is a compulsory requirement at Westnetz in Bad Kreuznach, as stipulated by the standard DIN VDE 0105 part 1. However, sometimes problems can arise, as it may not be possible to conclusively identify cables despite the strict compliance with regulations. Traditional cable identifiers work by relying on system properties with many fringe conditions that cannot always be complied with in practice. The cable identifier CI/LCI from Megger is the first to offer a user-friendly and safe solution.

Fault location with the ETF 3

The 3kV energy separation filter (ETF 3) is specially developed for fault location on symmetrical communication and pilot cables. This article covers the technology and best way to use the ETF 3, as well as field examples of the the system in use.

Sheath testing for fault location

Water ingress caused by damaged cable sheaths is a leading cause of faults in plastic-sheathed cables. Proper cable maintenance through sheath testing can extend the life of the cable by preventing the long term damage caused by water ingress. This article covers best practices and best equipment to use when sheath testing.

Pre-location transient methods

Learn more about the behaviour of transiet waves when a breakdown occurs at a cable fault, and understand how to evaluate and measure these transients for a more efficient fault location process. This article covers both DECAY (voltage decoupling) and ICE (current decoupling)

 

 

Pre-location pulse reflection process

Learn more about the interaction between pre-locaation and pinpointing to minimise fault location time. pre-location methods referrenced include TDR and HV methods. Additionally, this document discusses the values a fault must exhibit to be located by pulse reflection. 

Pre-location ICE method

The four most effective impulse current (ICE) methods for high resistance and intermittent power cable faults are "Direct mode", "Comparison mode", "Differential-comparison mode", Loop-on/Loop-off mode". The following document discusses the the process of each method.

Pre-location with ARM arc reflection technology

Understanding the most common fault types is critical to cable fault location. More than 80% of cable faults are high impedance faults. This document breaks down the properties of the high impedance fault, and discusses the most effective way to deal with them through Arc Reflection (ARM) technologies. 

Fault location on power cables

Gain insight into specialised fault location and pinpointing proceedures for high voltage power lines. Look at the construction of high voltage cables, as well as the methods and practices that are becoming new the standard, such as condition based preventative maintenance. 

Fault location in low voltage networks

Discover key strategies when conducting fault location on low voltage cables. Inluded are typical LV behaviours, advantages and disadvantages of LV testing, different test methods and best practices. 

Comprobaciones en baja tensión

 

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Multifunction testers were designed for residential and commercial electrical contractors, but also meet the needs of those working in utilities and industry

Multifunction testers are extremely versatile. They were designed to meet the needs of electrical contractors – rapid, accurate measurements in a tough case – but are also of direct relevance to electrical engineers working in other industries.

Análisis de Interruptores

 

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Medición de la corriente del motor de carga de resorte

Cuando se detectan posibles problemas de funcionamiento en el mecanismo de carga del resorte, puede que se estén causando desviaciones en la operación del motor. Estas desviaciones se pueden detectar si se monitoriza la corriente del motor durante la operación. A continuación se explica cómo realizar esta monitorización con el TM1700/1800 de Megger.

 

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Mediciones de temporización en GIS

En la siguiente nota técnica sobre medición de temporización en GIS, se explica la medición del tiempo, usando TM1700/1800 con medición capacitiva dinámica (DCM) en interruptores (CB) aislados por gas (GIS) conectados a tierra en ambos extremos usando conmutadores conectados a tierra.

 

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Circuit breaker diagnostic testing

The paper provides a simple explanation of vibration testing and the type of diagnostic information it can produce. Care must be taken in setting up and carrying out the tests if accurate and dependable results are to be obtained. Users should also be aware of electrical interference such as induction, which is always present in electrical substations.

With extreme care and a suitably qualified person, circuit breaker test sets can perform online condition assessments.

First trip analysis is a crucial tool to anticipate faults before they become critical, and to minimise disruption. Today’s circuit breaker analysers are very versatile. They can be configured to suit specific requirements, ensuring that users never pay for features they don’t need.

ODEN primary current injection test system used to test MCCBs in situ

A US based nuclear power generator needed some particularly robust test equipment to cope with testing MCCBs. By working collaboratively with Megger, Diablo Canyon has saved significant costs in its testing regime

Comprobaciones de Tierra

 

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Earth testers have undergone a fundamental redesign with users’ needs given priority

The latest earth testers were designed after intensive research, observing the challenges that field engineers have had to put up with. The critical issues have been addressed, and you can now get earth testers with increased user safety and providing huge savings in time and aggravation.

Mediciones de Aislamiento

 

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Diagnostic insulation tests for condition assessment of electrical assets have been redesigned to eliminate the shortcomings of older test equipment

Portable high voltage diagnostic insulation testers feature automatic voltage dependence detection and are much lighter and easier to use than previously. They also provide comprehensive facilities for archiving, analysing and reporting results.

Insulation testing requirements for telecommunications twisted pair cables

Accurately determining the insulation condition in twisted copper cable pairs is an essential requirement in the CATV and telecommunications sectors. Selecting test equipment that is tough, easy to use and capable is now possible.

Interpreting long-term insulation resistance trends

Having good insulation on electrical equipment is rather like having a water tank in your loft that’s actually watertight. In both cases, the cost of repairing an actual fault – whether it’s poor insulation or a leaking tank – is likely to be much less than the cost of repairing the damage caused by the fault. Nevertheless, how many people actually take the trouble to look occasionally at their water tanks to check that they are in good order? Not many, I suspect, even though doing so could potentially save a lot of money and heart-ache.

Mediciones en Relés de Protección

 

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Advice on the right time to buy a protective relay test set

The new generation of IEC 61850-ready test sets are designed to meet the needs of protection testing on the smart grid. The latest products are smaller, lighter and more powerful than previous generations and have been designed with increased productivity in mind

Mediciones de Transformadores

 

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Corrección de temperatura individual

Las técnicas de pruebas dieléctricas en los dominios de frecuencia y tiempo son cada vez más utilizadas por los fabricantes de transformadores, empresas de servicios públicos e investigadores para la evaluación de la condición del sistema de aislamiento de aceite-papel de transformadores. Desde 1997, cuando se lanzó al mercado el primer instrumento de medición portátil diseñado para llevar a cabo pruebas de respuesta dieléctrica del dominio de frecuencia en el campo se dio un paso muy importante en la evolución de este tipo de pruebas, incorporándole nuevas características. Una de esas características se está convirtiendo en una herramienta "imprescindible" para la evaluación de la condición dieléctrica del transformador de potencia: la corrección de temperatura individual.
 

Por el Dr. Diego Robalino, Megger

TRANSFORMERS MAGAZINE | Volume 2, Issue 3 | pp 42-47

Reliable transformer diagnostics are essential for efficient maintenance of ageing energy infrastructure

Dielectric Frequency Response (DFR/FDS) measurement is a technique for general insulation testing and diagnostics. In comparison with standard 50/60 Hz dissipation factor measurements, DFR measurements has many advantages.

Predictive diagnostic testing of electrical apparatus including transformers

Electric apparatus sometimes fails because of insulation deterioration. A proactive approach using Tan delta/power factor diagnostic testing is the key to monitoring the integrity of the insulation system and preventing or at least anticipating such failures. Understanding the impact of these parameters will help in obtaining accurate measurements that can be relied upon in the decision making process.

SFRA testing on transformers

Dismantling a power transformer to determine its condition is hardly ever a practical possibility. By using the latest proven SFRA test techniques, it is possible to accurately assess transformer condition without dismantling it.The latest SFRA test sets make these techniques more accessible, more convenient and more dependable that ever.

FRAX: Clamps and connections

Otras notas interesantes

 

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Wind turbine test leads for low resistance ohmmeter

Robust test leads have been specially designed for low resistance testing of wind turbines. The new leads lead to more accurate and repeatable results.

Electric and hybrid vehicles need a special testing regime

Insulation test instruments for use in garages on electric vehicles need to be both physically tough because of the environment in which they are used, and to provide accurate diagnostic information. Wireless data communication ensures that faults and critical trending information are diagnosed rapidly.

Using a TDR to find cable faults without applying a high voltage

Although you will still need a combination of test instruments including an insulation test set, in the right circumstances, a TDR can sometimes locate cable faults without the need to apply a high voltage to the cable.

Storing thermal images with asset maintenance information

Using asset management software together with thermal imaging cameras can result in more cost effective maintenance and fault finding on electrical equipment.

Electrical testing on rail systems is essential for safety and reliability

Standard ohmmeters are inadequate to accurately determine the resistance of high-current connections and a digital low resistance ohmmeter should be used. Modern TDRs can locate able faults at distances up to 20 km from the point at which the instrument is connected and some types feature dual channel operation, which allows faults between cables to be rapidly localised.

   

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