Librairie technique Megger

The fault current is set to 80mA tosimulatethe high current generated at the intermittent earth fault. The zero voltage is set to 20V;theconfiguration ismade in13 states.The fault states and the first two memory states are set to 20ms. The memory states havetimesselected togetthetrip as close to set time 1,2s as possible. In generator configuration,set U4gen to aux voltage DC.Set “Advanced mode” in SVERKER configuration.

Lorsque des tests de claquage d'échantillons d'huile aboutissent à des résultats inattendus, les causes sont souvent liées à un manque d'attention lors d'une ou de plusieurs étapes fondamentales de préparation de la cuve d'essai

Reducing the risk of failure on high voltage instrument transformers in the transmission system using the application of narrowband dielectric frequency response (NB DFR) on HV CVTs.

This is an easy solution to measure the impedance values for cables, the values are used for calculation of compensation factor in distance protection.The compensation factor is first theoretically calculated and these values can now be compared with the measured values.

The test and maintenance of electrical components on rolling stock is not an easy job to do. Some maintainers dismount some of the parts and bring them to a central location for revision and maintenance. This is a cumbersome and time consuming exercise. In many cases, the electrical parts are replaced only when they break down and are not subject to periodical testing. This of course holds a risk as some parts, e.g. circuit breakers, are crucial for safety reasons.

The MPQ software can be configured to automatically sync the remote MPQ to the network time periodically. This saves the expense of a GPS and removes the possibility of losing the GPS signal.

The MPQ can be controlled remotely using the Metrosoft PQ PC software. This app note shows how to do this.

A Comtrade Export feature is valuable when analyzing protection devices. It can help determine why a protection device is tripping or it can help determine if the protection device will trip under particular real world conditions.The MPQ analyzer can be left in the field for months or years at a time. During this time,it will record multiple real world events. These events can then be exported as a Comtrade file and then can be played back to protection devices tosee how they react.

The power measurement for a delta configuration uses a 2 wattmeter method even thoughthereare 3 phases.When measuring a wye all the voltages are referenced to neutral, referred to as line voltages. The measured currents are also line currents. Since both the voltage and currents are line values,the measurement does not introduce any phase shift.

The power measurement for a delta configuration uses a 2 wattmeter method even thoughtheyare 3 phases. When measuring a wye,all the voltages are referenced to neutral,referred to as line voltages. The measured currents are also line currents. Since both the voltage and currents are line values,the measurement does not introduce any phase shift.