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Related Manuals for Megger tan Delta Test Attachment
Summary of Contents for Megger tan Delta Test Attachment
- Page 1 Operating Instructions tan Delta Test Attachment Mess- und Ortungstechnik Measuring and Locating Technologies Elektrizitätsnetze Power Networks Kommunikationsnetze Communication Networks Rohrleitungsnetze Water Networks Leitungsortung Line Locating Issue: 7 (08/2015) – EN 128311098...
- Page 3 Megger All rights reserved. No part of this handbook may be copied by photographic or other means unless Megger have before-hand declared their consent in writing. The content of this handbook is subject to change without notice. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook.
- Page 4 This warranty does not apply to faults in the software supplied. During the period of warranty, Megger agree to repair faulty parts or replace them with new parts or parts as new (with the same usability and life as new parts) according to their choice.
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Page 5: Table Of Contents
Contents Safety Advices ........................6 General Notes ......................... 6 General Cautions and Warnings ....................7 Technical Description ......................8 Technical Priciples ........................8 Technical Data ......................... 9 System Description ........................ 10 2.3.1 Scope of Delivery and Accessories ................11 2.3.2 Measurement Data Unit (MDU) ..................12 2.3.3 Termination Current Unit (TCU) ................... -
Page 6: Safety Advices
Repair and maintenance Repairs and service must only be done by Megger or authorised service departments of Megger. Megger recommends having the equipment serviced and checked once per year at a Megger service location. -
Page 7: General Cautions And Warnings
1.2 General Cautions and Warnings Intended application The tan Delta test attachment can be used to measure the loss factor tanδ of cables and transformers (see section 2.3). Using the equipment for other purposes may lead to human danger and damage of equipment of involved installations. -
Page 8: Technical Description
Technical Description 2.1 Technical Priciples Requirement Underground medium and high voltage cables are continuously subject to thermal, electrical and mechanical stresses over the course of their use. This fact inevitably leads - despite the use of durable materials - to increasing damage or ageing of the cable, which in turn leads to dielectric losses. -
Page 9: Technical Data
2.2 Technical Data The tan Delta test attachment is defined by the following parameters: Parameter Value Measuring range, tanδ 1 x 10 ... 1 x 10 Measuring accuracy 1 x 10 Resolution 1 x 10 Frequency 0.01 Hz … 1 Hz... -
Page 10: System Description
PILC cables show a considerably higher dielectric loss factor. Prerequisites In order to use the tan Delta test attachment to measure the loss factor, a VLF sine wave voltage source (VLF Sinus test system) is required for applying a sinusoidal voltage to the test object. -
Page 11: Scope Of Delivery And Accessories
2.3.1 Scope of Delivery and Accessories Scope of delivery In addition to the above described main components, the tan Delta test attachment’s scope of delivery also includes the following components: • Measurement unit (MDU) • Data Reception Unit (DRU or DRU-1) •... -
Page 12: Measurement Data Unit (Mdu)
2.3.2 Measurement Data Unit (MDU) The following illustrations show the connection and operating elements of the MDU: Element Beschreibung HV connection, VLF sine wave source, Ø 10 mm HV connection test object, Ø 10 mm On/off button Status LED lit in green: operational lit in orange: charging Communications LED flashing green: Device is ready and awaiting activation (no high voltage... -
Page 13: Termination Current Unit (Tcu)
2.3.3 Termination Current Unit (TCU) The following illustrations show the connection and operating elements of the TCU: Element Beschreibung Leakage current connection (guarding) On/off button Status LED lit in green: operational lit in orange: charging Communications LED flashing blue: Communication with MDU Earthing connection TOSLINK connection sockets (IN / OUT) Holder (on both sides) -
Page 14: Setting Up The System
Setting Up the System 3.1 Connecting the DRU or DRU-1 Introduction The Data Reception Unit is available in two different models, with the respective model which best suits the system features being used. The DRU, which features a USB port, is generally used in systems which are operated using a laptop computer (e.g. -
Page 15: Power Supply
3.2 Power Supply Both the MDU and the TCU have an internal, maintenance-free nickel metal hydride battery. When the batteries are fully charged, both devices can be operated together during measurements for up to 16 hours. When the capacity is low, the respective status LED ( ) begins to flash orange. -
Page 16: Electrical Connection
The test site and the forbidden area must be made safe, fenced off and equipped with indicator lamps and warning signs according to the regulations. Before performing the actual electrical connection of the tan Delta test attachment, the VLF sine wave test system must be brought into position, secured and earthed according to the work steps described in the manual. - Page 17 • Condensation can appear if the tan Delta test attachment was stored in a cold place (e.g. overnight in the test van) and the system is afterward set up in a warm station. The condensation due to air humidity can be clearly seen and felt.
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Page 18: Electrical Connection For Measurements Without Leakage Current Compensation
3.3.1 Electrical Connection for Measurements without Leakage Current Compensation Connection of the MDU The following is an idealised illustration depicting the electrical connection of the MDU for measurements without leakage current compensation: Cable under test VLF Sinus Lock below this mark When connecting the MDU, proceed as follows: Step Description... - Page 19 Connection to the test Connect the other end of the HV cable coming from the MDU to the phase of the test object object which is to be tested, as described in the operating manual of the test voltage source. If measurements of multiple phases are planned, the numerically lowest phase should always be connected first.
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Page 20: Electrical Connection For Measurements With Leakage Current Compensation
3.3.2 Electrical Connection for Measurements with Leakage Current Compensation Connection of the MDU The following illustration depicts in a simplified manner the electrical connection of the MDU for measurements with leakage current compensation: cable under test VLF Sinus For measurements with leakage current compensation, the MDU is connected the same way as described in the previous section. - Page 21 Connection of the TCU The following illustration depicts in a simplified manner the electrical connection of the TCU for measurements with leakage current compensation. In the example shown, phase L1 is tested and the leakage current is transported from the remote termination to the test point via phase L2.
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Page 22: Starting Up The Test Attachment And The Test Voltage Source
For measurements with the TCU, turn on the TCU first, followed by the MDU. After the tan Delta test attachment has thus been made ready, the VLF Sinus test system can be connected with the mains supply and put into operation as described in... -
Page 23: Performing Measurements
Performing Measurements The actual measurement and the evaluation of the measured data are carried out either on a notebook connected to the test voltage source or on the control unit of the test van and are not covered in these instructions. For detailed information on how to perform a Tan Delta measurement, please read the operating manual of the test and diagnosis module in use or the guide “Software for remote control of a VLF Sinus test system”. -
Page 24: Concluding The Measurement
1.2 must be followed. WARNING After disassembly of the tan Delta test attachment, the optical TOSLINK- connection sockets on the MDU and TCU are to be immediately safeguarded with the supplied cover caps to protect them from dust and dirt. -
Page 25: Connection Examples
Introduction In this chapter, selected examples are used to point out possible problem areas to be considered when connecting the tan Delta test attachment. In principle, it can be said that the effects of unfavourable connection conditions are clearly less critical if higher tanδ absolute values are expected (e.g. for PILC cables). - Page 26 In particularly tight situations (such as in the following shown substation), one can undertake suitable protective measures to avoid a flashover. In this case, a semiconducting rubber mat was laid between the connection cable and the metal edge. Another point to be aware of is the connection to the phase. Special care should be taken here to ensure a PD-free connection.
- Page 27 For this connection situation, the optionally available connection set (see section 2.3.1) provides a suitable adapter used to directly plug the connection cable on the MC connector: Since this adapter ensures a secure fit, the cable can be aligned better and guided past the metallic components as shown below.
- Page 28 Using a longer Because of the height of the stand, it may be helpful in certain circumstances to use the connection cable optionally available 3 m long HV connection cable (see section 2.3.1) to ensure the necessary safety clearance to the metallic components. As a rule however, it is recommended to keep the connection length of the line as short as possible! Connection to bus...
- Page 29 Tento symbol indikuje, že výrobek nesoucí takovéto označení nelze likvidovat společně s běžným domovním odpadem. Jelikož se jedná o produkt obchodovaný mezi podnikatelskými subjekty (B2B), nelze jej likvidovat ani ve veřejných sběrných dvorech. Pokud se potřebujete tohoto výrobku zbavit, obraťte se na organizaci specializující se na likvidaci starých elektrických spotřebičů...
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