Ritz Instrument Transformers GmbH
Welcome
About Ritz
… together with over 200 years of experience in instrument
transformer production
since 1945
since 1945
since 1945
since 1904
RITZ Group - Organization
RITZ Foundation
Headquarters
KG Ritz Messwandler GmbH & Co.
Hamburg
RITZ Marchtrenk
Low and
medium voltage
RITZ Instrument Transformers GmbH
Ritz Wirges
Ritz Kirchaich
RITZ Dresden
Medium voltage
Medium voltage
Medium voltage
RITZ Kecskemet
Duromer Dresden
Components
Resin and
Cast resin products
RITZ Shanghai
RITZ Hartwell
Medium voltage
Low voltage
Ritz & It’s Subsidiaries
Incorporated in 1945, Ritz is one of the leaders in the field of Instrument transformers and
solid insulated bus bars for the transmission of high current. Ritz production and sales
offices are located across the world
RITZ
Hamburg
• Headquarters
RITZ
Wirges
• Medium voltage indoor and outdoor current and
voltage transformers up to 72,5kV
• Cast resin insulated distribution transformers up to 20 MVA
RITZ
Kirchaich
• Medium voltage indoor current transformer
RITZ
Dresden
Duromer
• Medium voltage indoor current and voltage transformers up to 36kV
• Management / Administration / Finance / Controlling /
Human Resources / R&D
• Fully insulated busbar systems
• Ring core current transformers
• Customized cast resin products
Ritz & It’s Subsidiaries (Cont…)
RITZ
Marchtrenk
(Austria)
• Medium voltage indoor and outdoor current and voltage
transformers up to 72,5 kV
• Complete range of low voltage current and voltage transformers
• Transformers for rail vehicels
RITZ
Kecskemét
• Iron Cores and components for CT´s
• Sub-supplier for the RITZ group
(Hungary)
RITZ
Shanghai
• Sales office
(China)
• Ring core current transformers
RITZ
Hartwell
• Low voltage current and voltage transformers
(USA)
• Medium voltage current and voltage transformers
Low Voltage Transformers
Medium Voltage Instr. Transf. - Indoor
- Epoxy resin current and voltage transformers
- Current and voltage sensors, epoxy resin insulated
- Combined current / voltage sensors
Medium Voltage Instr. Transf. - Outdoor
- Epoxy resin current and voltage transformers
- Designs up to 72,5 kV
Metal--enclosed Instrument Transformers
Metal
Generator Current Transformers
Special Transformers for Trains
Production & Test Equipment
Production Equipment
- Primary Winding Machines
- Secondary Winding Machines
- Kiln for heating up process of the active part
- Casting Machine with 18 clamping machines
- Kiln for cooling down process of the product after molding process
Test Equipment
- Insulation Test
5 kV voltage tester
- Partial Discharge test
Test transformer for 150 KVA AC/1A
Measuring condenser
Partial Discharge Measurement Equipment
- Accuracy
High Current Standard Transformer for 5000 A
Burden according to IEC & IEEE standard
Power Transformers
• Glass-fibre-vacuum technology up to 36kV & 20MVA
Power Transformers (Cont…)
Epoxy Cast Resin Power Transformers 50 kVA bis 20 MVA
RITZ manufacture dry type transformers for ratings up to 20 MVA
and 36 kV
Application range
• Power Distribution
• Rectifier Drives
• Generator Excitation
• Transmitter Systems
• Earthing Systems
• Traction Supply systems
• Oil Platforms / Vessels
• Laboratory systems
Customized service
• Transformer Installation
• Disposal of existing oil
and PCB Transformers
• Start-up
30 kV; 20MVA rated power; total weight 38 t
3 phase transformer
bank
Power: 8055 KVA
Width:
1,80m
Height:
3,00m
Length: 6,90m
Gewicht: 18.3 t
Power Transformers (Cont…)
Construction
design by
application of the
latest design
systems in 2D &
3D
Winding of a
transfomer cast coil
for HV side max.
diameter 1,3m
Test facility
Thermo scan of a
5MVA power
transformer during
heat run test
Fully Insulated Bus Bar System - SIS
SIS - Solid Insulation System
Electrical Rating Parameters:
• System voltage up to 52 kV.
• Rated current up to 6.000 A single system.
• Double system up to 12.000 A.
• Partial discharge free up to 1,5x phase to ground
voltage
System Specific Benefits
• Compact design
• Low space requirement
• Small bending radii
• 3-dimensional geometric shape
• No maintenance
Production Length
• 13 m x 3 m x 3 m
SIS - Company HistoryHistory-MWB
•
Established 1946 by Dr. Ing. Friedrich Raupach
•
1956 first fully resin insulated instrument transformer
•
1965 first resin insulated outdoor instrument transformer
-
In 1984, Ritz produced first installation of SIS bus bars
•
1989 MWB is split into three different companies Establishment of MWB Mittelspannung GmbH
•
1992 sale of MWB Mittelspannung to Sadtem
•
1999 establishment of MWB Messwandler GmbH as 100%
daughter of WTW Wirges GmbH
•
2007 merger of the companies WTW, MWB and Ritz to
RITZ Instrument Transformers GmbH
SIS – Bus Bar Design Principle
1
Aluminum or copper conductor.
2
The main insulation consists of epoxy resin impregnated crepe paper.
The impregnation process is performed under vacuum.
3
Capacitive graded area – implementing of capacitive layers by using semi-conductive
crepe paper.
4
The last layer is grounded and ensure touch-safe bus bar.
1
3
2
4
SIS – Production Process
Indoor Bus Bar
•
•
•
•
Paper insulated conductor, vacuum sealed by
using a shrinking sleeve.
Drying process under vacuum.
Impregnation process conducted under
vacuum.
Total process under temperature control.
Outdoor Bus Bar – Additional Steps
•
•
Indoor Bus bar covered by stainless steel tube.
Adding of outdoor material.
SIS – Multiple Bus Bar Connection
Insulated Bus Bar
Insulated Connecting Sleeve
Performed with flexible connectors
• Allows thermal compensation.
• Compensating of installation
tolerances
Connecting Sleeve
• Fully insulated
• Touch safe
• Capacitive graded
• Protection class IP45, higher classes
on request
Contact Spring
Expansion Joint
Contact Tube
Grounding Screw
SIS – End Bus Bar Connection
•
Conductor end with flat terminal according DIN
42 206
•
Conductor end with round bolt
•
•
According to customer’s specification
Gas-tight connection to GIS switchgear
- Metal flange fixed on the beginning of the
grounded part of the bus bar
- Connection by using contact bolts – standard
- Customized design
Resin cone
1. Contact bolt
2. Conductor
3. Insulation
4. Metal flange
Flange
Earthing screw
Conductor
Contact bolt
Spring
Paper resin
SIS – Fixation
Flexible mounting system – Ritz design
• Aluminum C-profiles
• Standard angles
• Hammer head screw (T-screw)
• Fixing clamps
- Fixed bearing
- Slide bearing to allow axial move to
allow movement caused by thermal
expansions.
Calculation Criteria
• Short circuit forces
• Natural system frequency & its harmonics
to avoid resonances
• Bus bar diameter
• Phase distance
• Mass of bus bar
• Bending strength
SIS – Application
Sample of a drawing sheet
SIS – Application (Cont…)
Bus Bar Installation Example
• Taking care of intersection of other metal constructions
minimum distance 300 mm
• 24 kV
• 3150 A
• Horizontal
connecting sleeve
• Vertical connecting
sleeve
SIS – Application (Cont…)
Wall bushing entering a switchgear from underneath
Connection sleeves vertical
mounted
SIS – Application (Cont…)
Connection within a compartment of an air
insulated switchgear
Connection with sealing flanges
SIS – Indoor Application
Indoor Installation
Limited space conditions
Two Indoor Systems parallel
Indoor Installation
Bus Bar with Current Transformer
Installation
SIS – Outdoor Application
Outdoor installation with roofing – connection to transformer
Capacitive grading of bus bar
insulation covered by cast-on
sheds to increase creepage
distance
SIS – Outdoor Application (Cont…)
Outdoor Installation
Connection of a Power
Transformer with High Flexible
Connectors
Outdoor Installation
Sealing of a connection point
(transformer box) with rubber
bellows (IP64)
SIS – Outdoor Application (Cont…)
Outdoor Installation
Sealing of a connection
sleeve (IP 64)
Outdoor Installation
Bus Bar routing
Ritz Instrument Transformers GmbH
Thank You for
Your
Attention