VAX020 - Measurement Megger - Free user manual and instructions

Product Type	High Voltage Amplifier
Brand	Megger
Model	VAX020
Application	Insulation diagnostics in electric power systems, moisture assessment for oil-immersed transformers
Output Voltage	2 kV peak (1414 V rms)
Output Current	50 mA peak (above 50 Hz), derating linearly to 30 mA below 10 Hz
Frequency Range	DC to 1 kHz
Capacitive Load	0-20 μF capability; max 80 nF at 50 Hz at 2 kV, 67 nF at 60 Hz
Mains Voltage	100-240 V AC, 50/60 Hz
Power Consumption	120 VA max
Dimensions (Instrument)	335 x 300 x 99 mm
Weight	4.4 kg (9.7 lbs) without accessories
Operating Temperature	-20°C to +55°C (-4°F to +131°F)
Storage Temperature	-40°C to +55°C (-40°F to +131°F)
Humidity	< 90% RH, non-condensing
Protection Class	IP21
Safety Features	Interlock input, protective ground terminal, overcurrent protection, safety instructions per IEEE 510-1983
Interface	Control via multi-pin connector to IDAX; interlock via 3-pole XLR
Compatible Systems	IDAX300, IDAX300S, IDAX206-FR, IDAX206, IDA200
Maintenance	Routine inspection of cables and connectors; clean with damp cloth; disconnect from mains before cleaning
Reparability	Do not attempt to service yourself; warranty void if opened; contact Megger for service

Frequently Asked Questions - VAX020 Megger

What is the VAX020 used for?

The VAX020 is a high-voltage amplifier that boosts the output voltage from an IDAX test system from 200 V to 2000 V peak for insulation diagnostics, particularly moisture assessment in oil-immersed transformers.

What is the maximum output voltage and current?

The maximum output voltage is 2 kV peak (1414 V rms) and the maximum output current is 50 mA peak above 50 Hz, derating linearly to 30 mA below 10 Hz.

How do I connect the VAX020 to an IDAX system?

Use the supplied 12-pole multi-cable to connect the VAX020 CONTROL port to the IDAX EXTERNAL port. Also connect the protective ground cable between the VAX020 ground wing nut and the IDAX ground.

What safety precautions should I take when using the VAX020?

Always ground the instrument via the protective ground terminal and the mains outlet. Use an interlock, keep clear of high-voltage circuits, and refer to IEEE 510-1983 safety practices. Never connect to energized equipment.

Can the VAX020 be used with any IDAX model?

The VAX020 is compatible with IDAX300, IDAX300S, IDAX206-FR, IDAX206, and IDA200 systems.

What is the frequency range of the VAX020?

The VAX020 operates from DC to 1 kHz.

What is the maximum capacitive load?

The VAX020 can drive capacitive loads up to 20 μF, but at 50 Hz and 2 kV the maximum is 80 nF, and at 60 Hz it is 67 nF.

How do I perform a measurement with the VAX020?

Connect the VAX020 and IDAX as instructed, turn both on, follow the IDAX setup, select 'VAX' as the voltage source, enter the desired RMS voltage (e.g., 1400 V for 2 kV peak), and proceed with the standard IDAX measurement.

What is the power requirement for the VAX020?

The VAX020 requires 100-240 V AC, 50/60 Hz, with a maximum power consumption of 120 VA.

How should I clean and maintain the VAX020?

Disconnect the instrument from mains before cleaning. Use a damp cloth; do not use liquid or aerosol cleaners. Inspect cables and connectors regularly for tightness and integrity.

USER MANUAL VAX020 Megger

High Voltage Amplifier

User's Manual

Megger

VAX020

High Voltage Amplifier

User's Manual

NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS

© 2013, Megger Sweden AB. All rights reserved.

The contents of this manual are the property of Megger Sweden AB. No part of this work may be reproduced or transmitted in any form or by any means, except as permitted in written license agreement with Megger Sweden AB. Megger Sweden AB has made every reasonable attempt to ensure the completeness and accuracy of this document. However, the information contained in this manual is subject to change without notice, and does not represent a commitment on the part of Megger Sweden AB. Any attached hardware schematics and technical descriptions, or software listings that disclose source code, are for informational purposes only. Reproduction in whole or in part to create working hardware or software for other than Megger Sweden AB products is strictly prohibited, except as permitted by written license agreement with Megger Sweden AB.

TRADEMARK NOTICES

Megger® and Programma® are trademarks registered in the U.S. and other countries. All other brand and product names mentioned in this document are trademarks or registered trademarks of their respective companies.

Megger Sweden AB is certified according to ISO 9001 and 14001.

Postal address:

Megger Sweden AB

Box 724

SE-182 17 DANDERYD

SWEDEN

Visiting address:

Megger Sweden AB

Rinkebyvägen 19

SE-182 36 DANDERYD

SWEDEN

T [phone]

F [phone]

[e-mail]

www.megger.com

Contents

1 Introduction

6

1 General....6

1.1 Description 6
1.2 Receiving instructions 6

2 Safety

8

2.1 Symbols on the instrument 8
2.2 Safety instructions....8

3 Control, indicators and connectors\_10

3.1 Front panel 10
3.2 Back panel....10

4 Run VAX020

12

4.1 Connections ...... 12
4.2 Perform a measurement....13

5 Specifications

14

1 Introduction

1 General

1.1 Description

VAX020 is a 2 kV voltage amplifier designed to work as an accessory to an IDA/IDAX test system, increasing the output voltage from 200 V to 2000 V peak (1414 V rms). The main application is insulation diagnostics in electric power systems with moisture assessment for oil-immersed transformers as a key area.

In particular, VAX020 is recommended in situations where measurements need to be performed during high interference, e.g. measuring low capacitance components in substations with severe AC and/or DC noise/offset.

1.2 Receiving instructions

Check the equipment received against the packing list to ensure that all materials are present. Notify Megger of any shortage. Telephone [phone] and ask for the Customer Service Department.

Examine the instrument for damage received in transit. If damage is discovered, file a claim with the carrier at once and notify Megger, giving a detailed description of the damage.

This instrument has been thoroughly tested and inspected to meet rigid specifications before being shipped. It is ready for use when set up as indicated in this manual.

2

Safety

2.1 Symbols on the instrument

Caution, refer to accompanying documents.

Caution, risk of electric shock.

Protective conductor terminal.

WEEE, Waste Electrical and Electronic Equipment. Please utilize your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements.

2.2 Safety instructions

Important

Read and comply with the following instructions.

Always comply with local safety regulations.

Warning

1] The test set and the specimen to which it is connected are a possible source of high-voltage electrical energy and all persons making or assisting in tests must use all practical safety precautions to prevent contact with energized parts of the test equipment and related circuits.
2] Persons actually engaged in the test must stand clear of all parts of the complete high-voltage circuit, including all connections, unless the test set is de-energized and all parts of the test circuit are grounded. Persons not directly involved with the work must be kept away from test activities by suitable barriers, barricades or warnings.
3] High-voltage discharges and other sources of strong electric or magnetic fields may interfere with the proper functioning of heart pacemakers. Persons with heart pacemakers should obtain expert advice on the possible risks before operating this equipment or being close to the equipment during operation.
4] Treat all terminals of high-voltage power equipment as a potential electric shock hazard. There is always the potential of voltages being induced at these terminals because of proximity to energized high-voltage lines or equipment.
5] The instrument is equipped with a power cord with integral safety ground pin. The equipment must be connected to a grounded mains outlet.

The instrument case must also be grounded by the separate protective ground wire with connection to the protective earth terminal on the rear panel. This is to eliminate differ-

ence in earth potential between the instrument and the device to be tested. Check the continuity of the protective ground wire before each use.

6] Do not attempt to service the instrument yourself. Opening or removing covers may expose you to dangerous voltage. If you attempt to service the instrument yourself the warranty is no longer valid.
7] Do not use any accessories that are not intended for use together with the instrument.
8] Do not use the instrument for any purpose other than indicated by the manufacturer.
9] Never connect the test set to energized equipment.
10] Operation is prohibited in rain or snow.
11] Do not use the test set in an explosive atmosphere.
12] Disconnect the instrument from the mains before cleaning. Use a damp cloth for cleaning. Do not use liquid cleaners or aerosol cleaners.

1] Always use a safety ground stick to ground the high-voltage conductor. A safety ground jumper must then be installed between all terminals of apparatus under test and ground.
2] Always disconnect test leads from power equipment before attempting to disconnect them at the test set. The ground connection must be the first made and the last removed. Any interruption of the grounding connection can create an electric shock hazard.
3] Before making connection to the power source, determine that the instrument rating matches the voltage of the power source and has a suitable two-pole, three-terminal grounding connector.
4] The power input plug must be inserted only into a mating receptacle with a ground contact. Do not bypass the grounding connection. Any interruption of the grounding connection can create an electric shock hazard. Determine that the receptacle is properly wired before inserting the plug.
5] Routine maintenance is all that is required for these test sets. The cables and connector panel should be inspected frequently to be

sure all connections are tight and all ground connections intact.

6] A qualified operator should be in attendance at all times while the test equipment is in operation.
7] Refer to IEEE 510-1983, "IEEE Recommended Practices for Safety in High-Voltage and High-Power Testing," for information.
8] Make sure that air intake and fan exhausts are not blocked
9] Avoid dusty environments and locations because the accuracy can be affected by long-term exposure to dust
10] The VAX020 is designed for indoor and outdoor use. Although a rugged instrument, it should be well protected when moved or shipped.
11] The Protective Earth/Ground (PE) of the VAX020 is connected to the earth/ground pin of the inlet, making it grounded when the mains cord is connected.
12] Connect VAX020 to ground using the ground wing nut on the front panel to ensure protective grounding independent of the mains cord being connected or not.

3

Control, indicators and connectors

3.1 Front panel

1.	ON / OFF switch
2.	Mains inlet
3.	Ground: wing nut/screw (PE)
4.	Control: multi-pin connector to IDAX
5.	Interlock: 3-pole XLR
6.	Output: red LED is lit when high-voltage output is active
7.	Output: HV connector for 0-2000 V

3.2 Back panel

■Two holes/grids for fans
Air inlet

4 Run VAX020

4.1 Connections

1] Connect VAX020 to protective ground on the IDAX using the Ground cable (green in the figure below)
2] Connect VAX020 (CONTROL) to IDAX (EXTERNAL) with the 12 pole multi-cable (blue in the figure below)
3] Connect an Interlock cable to the Interlock input (violet in the figure below)
4] Connect the VAX020 to the test object using the Generator cable (18 meter) with HV connector and clamp
5] Connect the Measure cable from the IDAX to the test object

4.2 Perform a measurement

1] Turn on the IDAX and the VAX020
2] Follow the standard IDAX procedure for measurement setup
3] When prompted to select voltage: choose VAX
4] Then add required voltage, e.g. 1400 V (RMS) (same as 2 kV peak)
5] Perform the measurement in the same way as a standard IDAX measurement. See IDAX User Manual for more details.

5

Specifications

Specifications VAX020

Environmental

Application field The instrument is intended for use in medium- and high-voltage substations and industrial environments.

Ambient temperature

Operating -20°C to +55°C (-4°F to +131°F)

Storage -40°C to +55°C (-40°F to +131°F)

Humidity < 90% RH, non-condensing

CE-marking

EMC 2004/108/EC

LVD 2006/95/EC

Category CAT 1

IP class IP21

General

Mains voltage 100-240 V AC, 50 / 60 Hz

Power consumption 120 VA (max)

Dimensions Instrument 335 x 300 x 99 mm (17.7" x 6.3" x 16.1")

Transport case 520 x 430 x 220 mm (20.5" x 17" x 8.7")

Weight 4.4 kg (9.7 lbs) without accessories

Interface

Control Connects VAX020 with IDAX

Interlock An external contact must be closed to allow the VAX020 to generate any voltage

Output HV connector that connects VAX020 to the test object

VAX020 can be used to get together with the following IDAX systems: IDAX300, IDAX300S, IDAX206-FR, IDAX206 and IDA200

Output

Voltage 2 kV (peak)

Current 50 mA (peak) above 50 Hz derating linearly to 30 mA below 10 Hz

Frequency range DC-1 kHz

Capacitive load 0-20 μF capability

Max capacitive load 80 nF at 50 Hz at 2 kV 67 nF at 60 Hz

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Megger is certified according to ISO 9001 and 14001. Megger is a registered trademark.

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Postal address:

Megger Sweden AB

Box 724

SE-182 17 DANDERYD

SWEDEN

Visiting address:

Megger Sweden AB

Rinkebyvägen 19

SE-182 36 DANDERYD

SWEDEN

T [phone]

F [phone]

[e-mail]

www.megger.com