Download Specification for Impulse Voltage Generator

Specification for Impulse Voltage Generator
(3200kV Impulse Voltage Generator for Large Power
Transformers)
And
(1200kV Impulse Voltage Generator for Medium Power
Transformers)
Compiled by: Rodger Moore
Rotek and Roshcon T&SS
Engineering Department
Date 2014-12-13
Number of pages 7
1
CONTENTS
1. Background
3
2. Objective
3
3. Test bay upgrade requirements of equipment
3
3.1
Engineering Philosophy
3
3.2
Maintenance Philosophy
3
3.3
Operating Philosophy
3
3.4
Project Management Philosophy
3
4.
Scope
4
4.1
Minimum requirements
4
4.2
Main Components
5
4.3
Power supply requirement
5
5.
Standards, Codes and Specifications
5
6.
Guarantees
6
7.
Testing and Inspection
6
8.
Quality Management
6
9.
Safety Management
6
10.
Environmental Management
7
2
1. Background
Rotek Engineering’s Transformer and Switchgear Services Division is an
organisation specialising in the repairs of transformers. Its workshop is
situated in Johannesburg, South Africa at an altitude of 1800 metres above
sea level. It is equipped to manufacture replacement windings for three phase
transformers up to 800 MVA with voltages ranging up to 765 kV.
The type of repairs carried out on the transformers necessitates HV electrical
testing to prove the repairs and serviceability of the units. At present Rotek is
able to carry out routine and temperature rise tests on Power and furnace
transformers as required by IEC 60076, part 1, 2 and 3 but requires to
upgrade the Impulse Voltage Generators and new 132kV bushing test facility.
Provision of the required power supply, including power cable and switchgear,
must be included in the tender.
2. Objective
Procure the necessary equipment to facilitate Impulse tests on medium and
large power transformers up to 800 MVA and voltages ranging up to 400 kV
and 765 kV.
Impulse Voltage test is described in IEC 60076 part 3 documentation.
3. Test Bay Impulse Voltage Generator upgrade requirements
3.1
Engineering Philosophy
The various equipment and associated auxiliaries should be designed in
accordance with internationally accepted standards.
3.2
Maintenance Philosophy
Maintenance of the equipment and associated auxiliaries should be kept at a
minimum.
3.3
Operating Philosophy
The equipment and associated auxiliaries should be designed in such a
manner as to cost effectively improve safety, reliability and production.
3.4
Project Management Philosophy
The project must be tendered on the bases of a “Turnkey” project. It is
required that the supplier/contractor takes total responsibility the civil design,
electrical
design,
manufacture,
test,
deliver,
erection/installation,
commissioning and civil works of the transformer under test and is covered by
Professional and Contractors Liability Insurance.
3
4.
Scope
4.1
Minimum requirements
The scope of work includes the following:
 Trenching, Installation and commissioning of the required supply cable
(400V) to the to the impulse voltage generator.
 Design, manufacture, test, deliver, erection/installation, commissioning
and demonstration of all equipment to facilitate impulse voltage testing of
medium and large power transformers.
 Installation of all required protection systems.
 Contractor must indicate the required area needed for installation (an
outline drawing of the current layout of the workshop will be provided on
request).
 Contractor supervision during installation.
 Indication must be stated regarding the delivery and installation time of
equipment.
 Operating and maintenance manuals to be supplied with all equipment.
 OEM / Contractor to provide training of Rotek test staff to conduct impulse
voltage testing, use of Glaninger circuit and overshoot compensating
capacitor.
 Training must be carried out on a transformer to simulate a real
experience (Transformer will be supplied by Rotek).
 Equipment insulation must be suitable rated for operation at 1800m above
sea level.
 Adequate kilo-joule (kJ) rating to test to IEC 60076 part 3 Specification
 PLC based control Technique, with simple and reliable structure.
 Fiber-optic control system, ensuring safety at high voltages.
 Stage capacitor grounding circuit, ensuring safety to personnel when
altering internal resistors.
 Protective grounding device operating automatically at power outages.
 Reliable and accurate triggering system.
 Series resistors must be interchangeable with one another as well as
parallel resistors.
 Short reconfiguration times (internal ladder, internal platforms, handy plugin resistors and connections, special resistor support compartments on
every stage).
 Expandable Stage capacity.
 An overshoot compensating capacitor to test very high capacitive loads
still according to standard IEC impulse specifications.
 Glaninger circuit to test very low inductive loads.
 Equipment must be able to test power transformers with lightning and
switching impulses.
 Front, tail and termination resistors according to IEC 60076-3 for switching
impulse
4
4.2
Main components








4.3
3200kV impulse voltage generator with air cushion.
Charging unit
Impulse voltage divider
Chopping gap
Computer measuring and fiber-optic control system with operating desk
Load capacitor for wave shape correction with switching impulses
Shunts for current measurement
Front, tail and termination resistors for wave shape correction with
switching impulses
Power Supply Requirement
Tender to specify the specific power supply requirements for:
 Impulse voltage generator for large power transformers
 Impulse voltage generator for medium power transformers
5.
Standards, Codes and Specifications
Whenever reference is made to a code or standard, it shall be understood that
the latest edition as of the date of contract award shall govern.
In the event of conflicts between this specification and other documents, the
most stringent code or standard shall apply.
The following standards and specifications shall apply;








IEC 60060-1, High-voltage test techniques – Part 1: General definitions
and test requirements
IEC 60060-2, High-voltage test techniques – Part 2: Measuring
systems
IEC 60076-1,Power transformers – Part 1: General
IEC 60076-3, Power transformers – Part 3: Insulation levels, dielectric
tests and external
IEC 61083-1, Instruments and software used for measurement in highvoltage impulse tests –
Part 1: Requirements for instruments
IEC 61083-2, Digital recorders for measurements in high-voltage
impulse tests – Part 2:
Evaluation of software used for the determination of the parameters of
impulse waveforms
5
6.
Guarantees
The equipment supplied is guaranteed against faulty material or workmanship
for a period of 12 months after handing-over of the equipment. The
performance of equipment supplied including capacity, charge/discharge
conditions, efficiency and outputs meet design intent.
7.
Testing and Inspection
The manufacturer shall submit an Inspection and Test Plan which shall be
reviewed and approved by Rotek prior to start of fabrication.
Test and inspection of the equipment is required at the manufacturer’s
premises to ensure the equipment supplied will meet its design intent.
8.
Quality Management
Quality management
The Contractor defines the level of QA/QC or inspection imposed on his SubContractors and suppliers.
The test equipment is manufactured in accordance with a quality assurance
management system complying with ISO 9001:2000 and approved by the
Employer. The Employer reserves the right to conduct surveillance and
periodic inspections at the Contractor’s Works during the manufacturing
phase.
The programming of inspections, hold and witness points needs to be
incorporated in the Quality plans and is agreed between the Employer and the
Contractor prior to undertaking any work.
9.
Safety Management
Safety Management
The health and safety requirements are as per Rotek Standard EQH-I011
HEALT AND SAFETY SPECIFICTION FOR CONTRACTORS.
The Contractor takes every precaution to ensure safety and to protect the
Works and temporary works.
The Contractor is responsible for the safety and security of his personnel,
materials on site and the Works at all times.
Any electrical equipment, or appliances, used by the Contractor conforms to
the applicable OHS ACT safety standards and is maintained in a safe and
proper working condition.
6
The Contractor adheres to the safety regulations pertaining to the Rotek
workshops in addition to all requirements of the Occupational, Health and
Safety Act of 1993 and all later revisions thereof.
The Contractor provides all the required safety and personal protective
equipment to his staff for the duration of the contract. Safety barriers and
access scaffolding is temporary works and are the responsibility of the
Contractor.
The Contractor complies with the requirements of the Construction
Regulation, 2003 No. R1010 of the Act, and forwards proof of Notification of
Construction Works to the Department of Labour as required in the
Construction regulations.
The Contractor and his personnel attend an induction meeting on site and
sign the attendance sheet provided as proof of attendance .
10.
Environmental Management
Environmental Management
All environmental requirements shall be adhered to as per ISO 14001:2004.
The Contractor acquaints himself with all statutory and local environment
regulations and adheres to these without exception.
The Contractor complies with the Hazardous Chemical Regulations when
using any hazardous chemicals, as well as complying with the requirements
of the National Environmental Management Act of 1988.
7