RITZ ICO 72,5 Manuale utente

Continued safety and installation instructions

The high voltage current transformer works on the principle of the inductive transformer. The secondary side is

galvanically separated from the primary side. It is used in switchgear, switching device combinations and power

distribution systems in connection with secondary devices (relays, meters, indication instruments). The instru‐

ment transformer is designed in oil-paper insulation technology. Head housing and base are made of aluminum

and galvanised steel, the insulator is made of silicone. Refer to the rating plate on the device for the operational

specications.

1 Oil level indicator

2 Ring bolts for transport purposes

3 Primary connection

4 Insulator

5 Oil drain screw

6 Earthing bolt holes

7 Terminal box with secondary terminals

8 Rating plate

UNPACKING

Check the transformer for completeness and damage.

Pay attention to sharp edges. You could get cut on them.

If the transformer shows any signs of external damage,

there is a risk of electric shock during commissioning.

STORAGE

Store the transformer at an ambient temperature between

-25°C and +40°C.

» The transformer must preferably be stored in a ver‐

tical position and screwed to the ground.

» If you store the transformer in a lying position, the

device must stand upright for at least 24 hours before

it can be put into operation.

Secure the intrument transformer against slipping, tilting

and falling down.

TRANSPORT

The transformer must be handled by trained personnel

using suitable transport equipment (crane). Please note

the transport instructions on the Òdimensional drawing.

Observe the weight specied on the Òrating plate. Caution:

the transformer is top-heavy!

» Means of transport permitting, the transformers may

be transported in a vertical position.

» Larger transformers are transported in a horizontal

position.

If any damage occurs during transport or storage, please

Safety and installation instructions. Please read before use!

ICO

High voltage current transformer for outdoor use Page

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Version: 09/03/2020

GERMANY HAMBURG • WIRGES • KIRCHAICH • DRESDEN

AUSTRIA MARCHTRENK | HUNGARY KECSKEMÉT | CHINA SHANGHAI | USA HARTWELL

Continued on next page

Continued safety and installation instructions

NOTICE

Ensure a safe working environment during

installation, commissioning, shutdown and

during inspection work on the electrical system.

INSTALLATION

You may undertake the following installation work only if

you are a qualied electrician.

WARNING

Shut down the associated electrical system

before installation. Otherwise there is the risk of

suering an electric shock!

» Transport the transformer to the intended location.

Secure the base against movement. Bring the trans‐

former into the vertical position as described in the

ÒUser manual.

» Ensure that the mounting surface is even. Secure the

transformer using the base xture. Establish the

earthing connection at the transformer base. The

lifting xings should only be released after the trans‐

former has been fully secured!

» Avoid mechanical tension during operation. Ensure

that the instrument transformer is not subjected to

any dynamic loads such as vibrations, tensile forces or

knocks.

DANGER

You must not operate the secondary circuit of the

instrument transformer in open condition under

any circumstances. High voltages can occur at

the secondary terminals of the current trans‐

former with the secondary circuit open. There is

risk of death! The values of voltage induced in

the process also endanger the functional safety

of the instrument transformer.

COMMISSIONING

Ensure yourself that the instrument transformer is

installed properly and the secondary and primary cables

are connected correctly.

Have you checked the oil level via the oil level indicator?

Have you maintained the tightening torques specied? If

you have any questions, please ask an experienced col‐

league or contact us directly.

OPERATION

» During operation, never touch the primary or secon‐

dary terminals.

» Operate the transformer with the terminal box closed.

» Ensure that unauthorised persons and children cannot

access the instrument transformer.

» You must not operate the instrument transformer in

open condition (

Installation on page 2).

» Operate the instrument transformer only with an

intact composite insulator. Otherwise, you risk oil

leaking, greatly increased partial discharges and an

explosion of the instrument transformer.

SHUTDOWN

Shut down the associated electrical system. For your own

safety, earth the secondary circuit of the transformer.

Ensure that the system remains de-energised while

working on the instrument transformer.

DISMANTLING

Follow the work steps as described under

Shutdown

on page 2. Observe the safety instructions under

Instal‐

lation on page 2.

Then, loosen the secondary and primary terminals, the

base xtures and the earthing screws.

CLEANING

Follow the work steps as described under

Shutdown

on page 2. Observe the safety instructions under

Instal‐

lation on page 2.

» Regularly inspect the current transformer for external

soiling and damage, at least once a year and after spe‐

cial weather events (sandstorm, hail).

» Remove any soiling from the insulator at least once a

year as described in the ÒUser manual. After that, the

transformer must not be taken into use for at least

24 hours.

MAINTENANCE

The instrument transformer is maintenance-free with a

low pollution class and sucient ventilation (

Cleaning

on page 2).

Carry out a visual inspection at least once a year:

» Check the primary and secondary connection termi‐

nals and the screw ttings at the earthing connection.

» Check the oil level at the oil level indicator.

» Check the insulator for damage.

DO NOT RECTIFY FAULTS ON YOUR OWN!

The transformer cannot be repaired. If you suspect that the

transformer is faulty, please contact us immediately.

ICO

High voltage current transformer for outdoor use Page

2/3

Version: 09/03/2020

GERMANY HAMBURG • WIRGES • KIRCHAICH • DRESDEN

AUSTRIA MARCHTRENK | HUNGARY KECSKEMÉT | CHINA SHANGHAI | USA HARTWELL

Continued on next page

Continued safety and installation instructions

DISPOSAL

Dispose of the transformer in accordance with the regula‐

tions of the country in which the transformer is used.

We accept no liability for incorrect installation.

Manufacturer: RITZ Instrument Transformers GmbH · Wandsbeker Zollstraße 92-98 · 22041 Hamburg · Germany

ICO

High voltage current transformer for outdoor use Page

3/3

Version: 09/03/2020

GERMANY HAMBURG • WIRGES • KIRCHAICH • DRESDEN

AUSTRIA MARCHTRENK | HUNGARY KECSKEMÉT | CHINA SHANGHAI | USA HARTWELL

ICO 72,5...245

High voltage current transformer

User manual

HB ICO

Version: 01 / Stand 01.06.2021

GERMANY HAMBURG • WIRGES • KIRCHAICH • DRESDEN

AUSTRIA MARCHTRENK | HUNGARY KECSKEMÉT | CHINA SHANGHAI | USA HARTWELL

with the explicit consent of our company.

This document does not refer to patents, trademarks or other proprietary rights which

can be linked with specic terms or entries. The absence of these references, however,

does not imply that the relevant terms or entries are free from these rights. Subject to

technical modications.

Manufacturer: RITZ Instrument Transformers GmbH · Wandsbeker Zollstraße 92-98 · 22041 Hamburg · Germany

ICO 72,5...245USER MANUAL

2/47

Table of contents

1 READ FIRST, THEN TAKE ACTION! 5

1.1 About this device 5

1.1.1 What is the device? 5

1.1.2 What is the purpose of the device? 6

1.2 About this manual 7

1.2.1 Who is this manual intended for? 7

1.2.2 How is this manual set out? 7

1.2.3 How do you use this manual? 8

1.3 For your safety 8

1.3.1 When is it dangerous to use the device? 8

1.3.2 Who is allowed to work with this device? 9

1.3.3 What are the obligations of the operator of this device? 9

1.3.4 Which legal aspects should you be aware of? 10

1.3.5 What should you do in the event of damage? 10

1.4 Special equipment 11

1.4.1 Primary reconnection 11

1.4.2 Secondary tapping 11

2 HOW TO USE THIS DEVICE AS INTENDED 13

2.1 Important general safety instructions 13

2.1.1 Working disconnected from voltage 13

2.1.2 Technically awless condition of the transformer 13

2.1.3 Deviating operating conditions 13

2.1.4 Structural changes 13

2.2 Unpacking 14

2.3 Installation 15

2.3.1 Installing the device 15

2.3.2 Earthing the device 19

2.3.3 Connecting the device 20

2.4 Commissioning 22

2.5 Operating 22

2.6 Shutdown 23

3 WHEN TO INTERRUPT THE RUNNING OPERATION 24

3.1 Cleaning and maintenance 24

3.1.1 Cleaning the device 24

3.1.2 Maintaining the device 26

ICO 72,5...245 USER MANUAL

Table of contents

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3.2 Troubleshooting 30

3.3 Dismantling 32

3.4 Transport and storage 33

3.4.1 Transporting the device 33

3.4.2 Storing the device 37

3.5 Disposal 37

4 HOW WE AS THE MANUFACTURER CAN HELP 38

4.1 Repairs 38

4.2 Spare parts 38

4.3 Other queries 38

5 TECHNICAL DATA 39

5.1 Technical data 39

5.2 Environmental conditions 40

5.3 Rating plate 41

5.4 Circuit diagram 42

5.5 Technical illustration 43

6 SYMBOLS AND ABBREVIATIONS 44

6.1 Symbols and abbreviations 44

6.2 Safety labels 46

7 CONTACT / CUSTOMER SERVICE 47

ICO 72,5...245USER MANUAL

Table of contents

4/47

1 Read rst, then take action!

1.1 About this device

1.1.1 What is the device?

This device is a ICO type current transformer for outdoor use. The

current transformer is used to convert high alternating currents into

smaller, directly measurable currents according to the principle of the

inductive transformer. The secondary side is galvanically separated

from the primary side.

Other special properties of the ICO type current transformer are:

» The transformer is oil-paper insulated and hermetically sealed.

This protects the oil-paper insulation from external inuences and

oil maintenance is not required. A high-quality PCB-free insulating

oil in accordance with IEC and ASTM is used for insulation.

» The external insulation is provided by a polymer hollow core insu‐

lator. This consists of a glass-bre reinforced inner tube to which

silicone shields with aluminium anges are attached on the out‐

side. The screws on the insulator ange and the ttings at the top

and bottom are made of stainless steel and are tightened at the

factory according to the specications.

»Composite and porcelain insulators are available to cope with dif‐

ferent degrees of pollution and load classes. The standard model is

already designed for 31 mm/kV and load class 2.

» Corrosion-resistant components, a stainless steel expansion cell

and chambered O-ring seals ensure that it is maintenance-free

over the entire product life cycle.

»High-voltage windings with double enamel-coated magnet wire

ensure insulation between the windings.

» To change or vary the transformation ratio of a transformer, the

secondary windings can optionally be tapped (special equipment,

Chapter 1.4.2 Secondary tapping on page 11)

» The secondary connections are located in the marine-grade cast

aluminium terminal box at the front of the transformer base. A

removable and eld drillable aluminium plate is available on the

underside of the terminal box for the customer's cable glands. The

terminal box is prepared for the operation of an optional condensa‐

tion heating element.

» The electrical congurations from 72 kV nominal voltage up to the

voltage series listed on the device, maximum 245 kV, allow connec‐

tion to digital and conventional measuring and protection devices

such as switchgear, switching device combinations and power dis‐

tribution systems in connection with secondary devices (relays,

meters, indication instruments).

ICO 72,5...245 USER MANUAL

Read rst, then take action!

5/47

» An oil drain screw enables access to the oil chamber in the trans‐

former base. The oil level indicator on the head of the transformer

is optimised for the operator's viewing angle.

» Four transport eyes on the transformer base facilitate proper han‐

dling during installation.

For further information or details regarding the shield shape, ash‐

over distance and creepage path, please refer to the

Dimensional

drawing.

The device meets the relevant VDE-, IEC- and EN-standards. You will

nd the electrical data on the

Rating plate.

The type designation and specication of the device can be found

on the

Datasheet and the device's

Rating plate. The rating

plate is usually located at the front of the secondary terminal box.

Upon request, the ICO type transformer will be factory designed to

meet all national and international standards including IEEE /

ANSI, CSA, IEC as well as all customer requirements.

1.1.2 What is the purpose of the device?

The task of the current transformer is to transfer currents proportion‐

ally and phase-true such that they are detectable for measuring equip‐

ment at low potential.

The current transformer translates high currents into lower, directly

measurable currents, which are adapted to the downstream secondary

technology. The electrical congurations are suitable for digital and

conventional measuring and protection devices.

- Depending on the version, - the ICO type current transformer is suit‐

able for use at a maximum voltage for operating equipment (Um) of

72,5 kV, 123 kV, 145 kV, 170 kV or 245 kV.

The ICO type current transformers can be equipped with windings for

measuring and protection purposes. They are intended for use in

» switchgear, switching device combinations,

» power distribution systems in connection with secondary devices

(relays, meters, indication instruments).

ICO 72,5...245USER MANUAL

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6/47

1.2 About this manual

1.2.1 Who is this manual intended for?

The target group includes everyone involved in the installation,

operation and maintenance of this device.

NOTICE

Please read this user manual carefully before commissioning the

device and observe all the regulations and information. This helps

prevent personal injury and damage to property.

1.2.2 How is this manual set out?

The theory section gets you ready to use the device safely and

correctly.

The practical section shows you how to connect the device and when to

disconnect it from the mains.

The fourth section deals with questions about repair and service.

Some of the information and illustrations in this manual may

dier from the features of your device. This includes details of

special equipment, abstractions and example illustrations.

The safety instructions are dierentiated according to the type and

severity of the hazard:

DANGER

Danger to life

WARNING

Warning of serious injury

Fig. 1: Read this user

manual rst than take

action!

Layout of the manual

Layout of the safety

instructions

ICO 72,5...245 USER MANUAL

Read rst, then take action!

7/47

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