Ritz Instrument Transformers GmbH

Welcome

About RitzAbout Ritz

… together with over 200 years of experience in instrument

transformer production

since 1904

since 1945 since 1945since 1945

RITZ Group RITZ Group -- OrganizationOrganization

RITZ Foundation

HeadquartersKG Ritz Messwandler GmbH & Co.

Hamburg

RITZ MarchtrenkLow and

medium voltage

RITZ Shanghai

Medium voltage

RITZ Kecskemet

Components

Ritz Wirges

Medium voltage

RITZ Dresden

Medium voltage

Duromer DresdenResin and

Cast resin products

Ritz Kirchaich

Medium voltage

RITZ Instrument Transformers GmbHRITZ Hartwell

Low voltage

Ritz & It’s SubsidiariesRitz & It’s Subsidiaries

• Headquarters• Management / Administration / Finance / Controlling / Human Resources / R&D

• Medium voltage indoor and outdoor current andvoltage transformers up to 72,5kV

RITZWirges

RITZHamburg

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

voltage transformers up to 72,5kV• Cast resin insulated distribution transformers up to 20 MVA

• Medium voltage indoor current transformer

• Fully insulated busbar systems

• Medium voltage indoor current and voltage transformers up to 36kV

• Ring core current transformers

• Customized cast resin products

Wirges

RITZDresdenDuromer

RITZKirchaich

• Iron Cores and components for CT´s

• Sub-supplier for the RITZ group

RITZKecskemét

(Hungary)

Ritz & It’s Subsidiaries Ritz & It’s Subsidiaries (Cont…)(Cont…)

RITZMarchtrenk(Austria)

• Medium voltage indoor and outdoor current and voltagetransformers up to 72,5 kV

• Complete range of low voltage current and voltage transformers

• Transformers for rail vehicels

• Sales office

• Medium voltage current and voltage transformers

• Ring core current transformers

(Hungary)

RITZShanghai

(China)

RITZ Hartwell

(USA)

• Low voltage current and voltage transformers

Low Voltage TransformersLow Voltage Transformers

- Epoxy resin current and voltage transformers- Current and voltage sensors, epoxy resin insulated- Combined current / voltage sensors

Medium Voltage Instr. Transf. Medium Voltage Instr. Transf. -- IndoorIndoor

- Epoxy resin current and voltage transformers- Designs up to 72,5 kV

Medium Voltage Instr. Transf. Medium Voltage Instr. Transf. -- OutdoorOutdoor

MetalMetal--enclosed Instrument Transformersenclosed Instrument Transformers

Generator Current TransformersGenerator Current Transformers

Special Transformers for TrainsSpecial Transformers for Trains

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

Production & Test EquipmentProduction & Test Equipment

- Insulation Test5 kV voltage tester

- Partial Discharge testTest transformer for 150 KVA AC/1AMeasuring condenserPartial Discharge Measurement Equipment

- AccuracyHigh Current Standard Transformer for 5000 ABurden according to IEC & IEEE standard

Power TransformersPower Transformers

• Glass-fibre-vacuum technology up to 36kV & 20MVA

Application range

• Power Distribution• Rectifier Drives • Generator Excitation• Transmitter Systems

Epoxy Cast Resin Power Transformers 50 kVA bis 20 MVA

RITZ manufacture dry type transformers for ratings up to 20 MVA and 36 kV

Power Power Transformers Transformers (Cont…)(Cont…)

• 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 KVAWidth: 1,80mHeight: 3,00mLength: 6,90mGewicht: 18.3 t

Power Power Transformers Transformers (Cont…)(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 Fully Insulated Bus Bar System -- SISSIS

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 SIS -- Company HistoryCompany History--MWBMWB

• 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 GmbHEstablishment 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 SIS –– Bus Bar Design PrincipleBus 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 23 4

SIS SIS –– Production ProcessProduction 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.• Total process under temperature control.

Outdoor Bus Bar – Additional Steps

• Indoor Bus bar covered by stainless steel tube.

• Adding of outdoor material.

SIS SIS –– Multiple Bus Bar ConnectionMultiple Bus Bar Connection

Performed with flexible connectors

• Allows thermal compensation.

• Compensating of installation

tolerances

Connecting Sleeve

• Fully insulated Contact Tube

Insulated Bus Bar

Insulated Connecting Sleeve

Contact Spring

Expansion Joint

• Touch safe

• Capacitive graded

• Protection class IP45, higher classes

on request

Grounding Screw

SIS SIS –– End Bus Bar ConnectionEnd 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• 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

1. Contact bolt 2. Conductor

3. Insulation 4. Metal flange

FlangeResin cone

Earthing screw

ConductorPaper resin

SpringContact bolt

SIS SIS –– FixationFixation

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.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 SIS –– ApplicationApplication

Sample of a drawing sheet

SIS SIS –– Application Application (Cont…)(Cont…)

Bus Bar Installation Example

• Taking care of intersection of other metal constructions minimum distance 300 mm

• 24 kV

• 3150 A

• Horizontal

connecting sleeveconnecting sleeve

• Vertical connecting

sleeve

SIS SIS –– ApplicationApplication (Cont…)(Cont…)

Wall bushing entering a switchgear from underneath

Connection sleeves vertical

mounted

SIS SIS –– ApplicationApplication (Cont…)(Cont…)

Connection within a compartment of an air insulated switchgear

Connection with sealing flanges

SIS SIS –– Indoor ApplicationIndoor Application

Indoor Installation

Limited space conditionsTwo Indoor Systems parallel

Indoor Installation

Bus Bar with Current Transformer Installation

SIS SIS –– Outdoor ApplicationOutdoor Application

Outdoor installation with roofing – connection to transformer

Capacitive grading of bus bar

insulation covered by cast-on

sheds to increase creepage

distance

SIS SIS –– Outdoor ApplicationOutdoor Application (Cont…)(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 SIS –– Outdoor ApplicationOutdoor Application (Cont…)(Cont…)

Outdoor InstallationSealing of a connection

sleeve (IP 64)

Outdoor Installation

Bus Bar routing

Ritz Instrument Transformers GmbH

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