Differential Protection Relays

 

Differential Protection Relays for Transformers, Lines & Power Systems

Differential protection relays are normally specified where fast and selective protection is required for important electrical equipment such as power transformers, transmission or distribution lines, generators, motors and busbars.

ARP IMPEX supplies differential protection relays for substations, MV/HV switchgear projects, industrial power systems, retrofit jobs and replacement requirements. We handle both current relay families and older installed models where the buyer already has an existing part number or nameplate.

If you are sourcing a differential protection relay supplier in India, transformer differential relay exporter, line differential protection relay supplier, or a specific ABB, Siemens or Schneider Electric model, send us the complete ordering code, quantity and destination country.

Transformer Differential Relay Requirements

Transformer protection is one of the most common reasons buyers approach us for differential relays.

The requirement may be for a new two-winding transformer panel, a three-winding transformer scheme, an existing substation upgrade or replacement of a relay that has been in service for many years.

ABB, Siemens and Schneider Electric all have dedicated transformer differential protection ranges. ABB’s RET615, for example, is designed for protection and control of two-winding power transformers and includes transformer differential protection. Siemens offers dedicated SIPROTEC 7UT devices for two-winding, three-winding and more complex transformer applications. Schneider Electric continues to list MiCOM P63x and P64x ranges for transformer differential protection and control.

For a transformer differential protection relay quotation, the complete relay reference is the best starting point. For a new project, transformer rating, winding arrangement and CT details may also be required.

Line Differential Protection Relays

Line differential protection is used where faults within a defined feeder or line section need to be detected selectively from both ends.

ABB RED615 is a dedicated two-end line differential protection and control relay used for overhead lines and cable feeders in utility and industrial distribution systems. Communication between the relay ends can be provided through suitable communication links depending on the installation.

ABB’s newer REX615 platform also covers line differential applications as part of its wider protection portfolio.

For buyers looking for an ABB RED615 supplier in India, line differential protection relay exporter, or replacement of an existing RED-series relay, send the full ABB ordering code rather than only the model name.

ABB Differential Protection Relays

ABB has several Relion families relevant to differential protection.

Typical requirements include:

• ABB RED615 for line differential protection
• ABB RET615 for transformer differential protection
• ABB RET620 / RET630 for transformer protection applications
• ABB REX615 for configurable transformer and line differential applications
• Other Relion models depending on the protected equipment and scheme

ABB’s 615-series portfolio covers line differential and transformer protection alongside feeder, motor, generator and other protection applications.

ARP IMPEX supplies ABB differential protection relay requirements for new panels, maintenance and replacement work. If you are looking for an ABB transformer differential relay supplier, ABB RED615 exporter, or an existing RET-series replacement, send the complete model and ordering code, quantity and delivery destination.

Siemens SIPROTEC Differential Protection Relays

Siemens SIPROTEC has a strong dedicated transformer differential range.

The 7UT82 is intended for two-winding transformer differential protection, while 7UT85 provides a modular platform for two-winding applications. 7UT86 is designed for three-winding transformers, and 7UT87 covers more complex multi-winding transformer arrangements.

This makes the exact SIPROTEC reference important. A request for simply a “Siemens transformer differential relay” can refer to very different applications.

ARP IMPEX handles requirements for Siemens 7UT82, 7UT85, 7UT86, 7UT87 and other model-specific SIPROTEC differential protection relays.

For a Siemens 7UT82 supplier in India, 7UT85 differential relay quotation, or replacement SIPROTEC requirement, send the complete Siemens article number along with the quantity and destination.

Schneider Electric Differential Protection Relays

Schneider Electric offers transformer differential protection through its PowerLogic and MiCOM protection portfolio.

MiCOM P63x is associated with transformer differential protection, while MiCOM P64x covers advanced transformer protection and control requirements. Schneider Electric’s PowerLogic P5 platform also covers applications extending from overcurrent protection through differential protection, depending on the selected configuration.

We handle enquiries for Schneider Electric MiCOM differential protection relays, existing P63x/P64x installations and PowerLogic protection requirements.

For a replacement, send the full MiCOM or PowerLogic reference from the existing relay. That is more useful than specifying only “Schneider transformer protection relay.”

Existing Differential Relay Failed or Became Obsolete?

Many differential relay enquiries come from older substations and industrial installations where the original relay is no longer available or the exact replacement is unclear.

The best starting point is the existing relay. Send us the manufacturer, complete relay model, full ordering code, nameplate photograph, quantity and destination country.

If available, also share the CT details, auxiliary supply, communication requirement and protected equipment information.

For transformer protection requirements, the transformer rating, winding arrangement and existing protection application can also help when an older relay needs to be checked against a current model.

We handle replacement enquiries for older ABB RET relays, Siemens 7UT differential relays, Schneider Electric MiCOM transformer protection relays and other installed differential protection models.

Differential Protection Relays for Substation & Industrial Projects

We work on differential relay requirements for:

• Power and distribution transformers
• Utility substations
• Industrial substations
• Overhead lines and cable feeders
• Captive power plants
• Generator-transformer units
• Steel plants
• Cement plants
• Mining operations
• Oil & gas installations
• Process industries
• Large industrial power systems

Project quantities and single replacement units are both handled, depending on the specific relay and availability.

If the consultant, EPC contractor or switchgear manufacturer has already specified a model, send us the complete BOM reference or relay ordering code and we can quote against that requirement.

Differential Protection Relay Supply from India to International Markets

Differential protection relay enquiries are usually highly model-specific, so we quote against the exact brand and relay reference rather than offering a generic substitute.

Requirements can be handled for substations and industrial projects in the UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, Egypt, Israel, Jordan and Lebanon.

We also work on ABB, Siemens and Schneider Electric protection relay requirements for Kenya, Nigeria, Ghana, Tanzania, Senegal, Uganda, Zambia, South Africa, Morocco, Tunisia, Mauritius, Rwanda, Botswana, Namibia, Eswatini and Lesotho.

European buyers can send model-specific requirements from Germany, the United Kingdom, France, Italy, the Netherlands, Spain, Belgium, Poland, the Czech Republic, Sweden, Denmark, Finland, Portugal, Hungary, Slovakia, Slovenia, Romania and Austria.

For Asia and other international markets, we quote requirements for Singapore, Malaysia, Vietnam, Indonesia, Thailand, the Philippines, Bangladesh, Sri Lanka, Nepal, Japan, South Korea, the United States, Canada, Mexico, Brazil, Chile, Colombia, Peru, Panama, Australia and New Zealand.

Have the Differential Relay Part Number?

If you already know the relay you need, send, Brand + Complete Model / Ordering Code + Quantity + Destination Country

For replacement or retrofit work, add, Nameplate Photo + CT Details + Auxiliary Supply + Communication Requirement

REQUEST A DIFFERENTIAL PROTECTION RELAY QUOTE

 

Differential Protection Relay FAQs

Which differential protection relay brands do you supply?

We handle model-specific differential protection relay requirements from ABB, Siemens and Schneider Electric for transformer, line and other applicable protection schemes.

Can you supply ABB RED615?

Yes. ABB RED615 is a dedicated two-end line differential protection and control relay for overhead line and cable feeder applications. Send the complete ABB ordering code for quotation.

Can you supply ABB RET615 transformer protection relays?

Yes. ABB RET615 is used for two-winding transformer protection and includes differential protection. Requirements should be sent with the full ABB ordering code.

Do you supply Siemens 7UT82, 7UT85, 7UT86 and 7UT87?

Yes. These SIPROTEC relays cover different transformer differential applications, from two-winding through more complex multi-winding transformer arrangements.

Can you supply Schneider Electric MiCOM P63x and P64x?

Yes. Schneider Electric lists MiCOM P63x for transformer differential protection and P64x for advanced transformer protection and control.

Can you help with an older differential protection relay?

Yes. Send the existing relay model, full ordering code and nameplate photo. Where available, include CT details, auxiliary supply and transformer or line information so the requirement can be checked more accurately.