On Load Tap Changer

Easun – MR (EMR) a leading manufacturer of on load tap changer is an Indo-German Joint Venture with the Maschinenfabrick Reinhausen GmbH, (MR), Germany and the Easun Group of India. Maschinenfabrick Reinhausen GmbH, (MR), Germany, the joint venture partner in EMR are the technology leaders in voltage regulation equipment and cater to the requirements of the Transformer manufacturers Worldwide.

Maschinenfabrick Reinhausen GmbH, (MR), Germany, the joint venture partner in EMR are the technology leaders in Voltage regulation equipment and cater to the requirements of the Transformer manufacturers Worldwide.

Their product range includes:

OLTC (On load tap changer)
OCTC (Off Circuit tap changer)
Motor Control Drive
Dry Type
Oil Surge Relay
Transformer Monitoring System
Retrofit Solutions for OLTC

OLTC

M-Type

Max. rated through-current (Single-phase)	350A-1800A
Max. rated through-current (three-phase)	350A-600A
Max. rated step voltage	3,300V
Max. rated switching capacity single phase	3,500 kVA
Max. rated switching capacity Three phase	1,500 kVA
Max. voltage for operational equipment Um	72.5Kv-300 kV
Operating positions without change-over selector	22 max
Operating positions with change-over selector	35 max

Benefits at your Glimpse:-
Special design are available with 700Amps,3 phase and 2100Amps, Single Phase
Both star and delta applications are available.
Diverter switch arcing contacts made of tungsten-copper alloy at 500A and above.
Long life and reduced maintenance-rapid tap change operation. Low thermal stress on the transition resistors.
High speed transition resistor type diverter switch with arcing extinction at first current zero.
Optimized integration of the change-over selector into the fine selector contact circle.

D-Type

Max. rated through-current (Single-phase)	200A-1500A
Max. rated through-current (three-phase)	200A-500A
Max. rated step voltage	2,500V
Max. rated switching capacity single phase	3,500 kVA
Max. rated switching capacity Three phase	1,500 kVA
Max. voltage for operational equipment Um	30Kv-150 kV
Operating positions without change-over selector	18 max
Operating positions with change-over selector	35 max

Benefits at your Glimpse:-
Special designs are available for 300Amps.
Both star and delta applications are available.
Over 1500’ In-Tank installation in ultra heavy duty applications which involves 500 operations per day.
Well Engineered contacts.
This Model is in Successful Service since 1974 catering to normal Network Application and to demanding Heavy Duty Furnace Applications.
Bi-directional Power Flow.

V-Type

Max. rated through-current (three-phase)	200/350/500A
Max. rated step voltage	1,500 V
Max. rated switching capacity	525 kVA
Max. voltage for operational equipment Um	40-123 kV
Operating positions without change-over selector	18 max
Operating positions with change-over selector	27 max

Benefits at your Glimpse:-
Bi-directional power flow.
Both star and delta applications are available.
Easy removal of divertor switch inserts, making it maintenance friendly.
Minimum switching time and arc energy and hence higher contact life.
10 times longer contact life compared to external mounted OLTCs.
Special designs are available for 250 and 400 Amps on request.
Designed for 5 L contact life

L-Type

Max. rated through-current	200A
Max. rated step voltage	825 V
Max. rated switching capacity Three phase	140 kVA
Max. voltage for operational equipment Um	11Kv-33 kV
Operating positions without change-over selector	9 max
Operating positions with change-over selector	17 max

OCTC

Max. rated through-current (Single-phase)	1200A
Max. rated through-current (three-phase)	800A
Max. rated step voltage	3300Kv
Max. rated switching capacity single phase	1000KVA
Max. voltage for operational equipment Um	245Kv
Operating positions without change-over selector(Linear)	10

MOTOR CONTROL DRIVE

Motor Drive Unit – MA-2 Specification

In MA-2 Step by Step Operation takes place by Snap Action Switch.
MA-2 motor drive unit can be used “D”, “3 x MI”, and “1 + 2” type OLTC models.
1Hp motor is used in MA-2.
The drive mechanisms built with a specialized series of gear to arrive at smoother Operation.
In MA-2 revolution per tap change is 33 rev.
MA-2 is tested for IP-56 Protection. Special Housing is also available for IP-65 protection.

MA-9 specification

MA-9 motor drive unit step by step operation is by CAM Action switch.
MA-9 can be used for “V”, “L” and “M III” type OLTC Model.
In MA-9 revolution per tap change is 30rev.
Less mechanical operation takes place in MA-9 gear unit.
0.75Hp motor is used in MA-9.
MA-9 is tested for IP-56 Protection. Special Housing is also available for IP-65 protection.
The drive mechanisms built with a specialized series of gear to arrive at smoother Operation.

DRY TYPE

AVT Specification

The on-load tap-changer VACUTAP® AVT with vacuum interrupters and integrated motor drive serves as switching element and for setting the ratio of dry-type transformers under load.

Max. rated through-current	170A
Max. rated step voltage	150V
Max. rated switching capacity	75 kVA
Max. voltage for operational equipment Um	11.5kV
Operating positions (Linear)	9max.

Benefits at your Glimpse:-

Number of Operations in Dry Type AVT is greater when compared to the oil type.
Simple handling.
Integrated voltage regulator and motor-drive unit.
Moving parts encapsulated to protect against contact.

OIL SURGE RELAY

The protective Oil Surge Relay (OSR) is used to protect the malfunction developed inside the On Load Tap Changer (OLTC). It is installed in the pipe between OLTC head and oil conservator.
Any malfunction builds pressure which leads to increased oil flow. This protective relay triggers the tripping circuit when the oil flow exceed the specified limits, thus making the transformer to be turned off and contain the damager to the OLTC and Transformer.
OSR is fitted with special Reed switch which assures rust free contacts even after decades after installation thereby is alert for operation. This OSR is designed and tested for very intensive seismic levels.
OSR is a part of the OLTC and its properties are subject to IEC 60214.

TRANSFORMER MONITORING SYSTEM

The MR make advanced Transformer Monitoring Systems which are promoted by Easun – MR monitor all parameters of transformer which can be individually adapted to your specific requirements with the option of different add-on modules. It is also possible to flexibly combine and adapt or expand the functions with customized signal assignment of board input / outputs.

In TRANSFORMER MONITORING SYSTEM following Monitoring functions are included:

Top oil temperature & Winding temperature
Ambient temperature
Tap position capture
Load current
Load voltage
Hotspot calculation
Ageing
Active power
Data logging
Number of hours per stage
Number of switch operations per stage
Number of passages through zero position

Advanced Monitoring

Additional monitoring functions (Bottom oil temperature of active part, direct measurement of winding temperature, Buchhloz relay of active part, oil conservator oil level, second ambient temperature).

Cooling System Control

Control of up to three cooling stages and inlet and outlet temperatures of coolant.

DGA

Indication of up to nine gases in oil and moisture content in oil.

Monitoring functions for MR on-load tap-changers, e.g. wear model, maintenance intervals

Potential Free inputs and outputs

Monitoring system for various signals, customer-specific sensors for analog, digital and PT 100 signals

Voltage Regulation

Voltage regulation, line drop compensation and paralleling. Our technical experts will assist you in installing the device.

RETROFIT SOLUTIONS WITH EASUN — MR OLTCS

Transformers are critical assets in the Electrical system. When a transformer unexpectedly fails due to On Load Tap Changer problem, revenues are lost as production comes to a standstill. Equipment age, extreme usage, lack of replacement parts, and declining availability of technical experts add to the growing risk of failure of transformer/ OLTCs.

A pre-emptive and well Planned OLTC Retrofit plan increases the life expectancy of your transformers and reduces total operation and maintenance costs.

An OLTC Retrofit with Easun — MR OLTCs increases the reliability of your transformer at a fraction of the cost of a new transformer. We will be able to provide the right combination of custom engineering and field expertise to design, procure, and install a replacement OLTC or to retrofit an existing OLTC.

Easun — MR will execute a comprehensive retrofit solution on end to end basis right from Oil Draining, Transformer Study, Tap Changer replacement till the Transformer is fully Restored. It is a Single Umbrella Package with no worries to the user. Just hand over transformer to us, rest we will handle.

Easun MR is providing this comprehensive retrofit package for any make Tap Changer without any exception.

We have carried out such retrofit over the past 30 years, You can fully bank on our experience.

Benefits of EMR Retrofits

A Single Source point for Retrofitting solution
Upgraded with Latest Cutting Edge OLTCs and Monitoring Systems.
Reliability & Proven technology
Increased life of transformer
Reduced down time installation
Operational reliability
Low cost of maintenance

Unit I & Marketing Office

Easun – MR Tap Changers Pvt Ltd Manufacturers of On Load Tap Changer
612, (232) C.T.H Road,
Thiruninravur – 602 024
Chennai, India.

91 – 44 26390863
91 – 44 26390881

helpdesk@easunmr.com
marketing@easunmr.com

Unit II

Manufacturers of On Load Tap Changer 20/5, Perumal Koil Street,
Thirubuvanai – 605 107
Pondicherry, INDIA

91 – 413-2907631
91 – 413-2641836

marketing@easunmr.com

http://www.easunmr.com/index.php

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