Differential Protection Relay
Product Code : LSK-EPS-10531
Differential Protection Relay (SKU LSK-EPS-10531) is a numerical three-phase differential relay in an educational format. Students use it to investigate the protection of transformers, auto transformers, generators and other two-winding apparatus, connecting it to the Protection Relay Test Set or other modules of the power systems range. Science Lab Supplies ships it from Ambala, India to engineering colleges, polytechnics, tender contractors and distributors.
Specifications
The relay is housed in a robust enclosure with a carrying handle and rests on the desk area of the test set or another power system product. A multi-core cable from its rear links it to that product, and 4 mm shrouded sockets on the relay take the leads to the test circuits.
| Parameter | Value |
|---|---|
| SKU | LSK-EPS-10531 |
| Relay type | Numerical three-phase differential protection, educational format |
| Protected apparatus | Transformers, auto transformers, generators and other two-winding apparatus |
| Characteristics shown | Stability during out-of-zone faults, zero-sequence filtering per winding, high-speed operation, magnetising inrush restraint, amplitude and vector matching |
| Connections | Rear multi-core cable; 4 mm shrouded sockets to test circuits |
| Programming | Keypad and display, or software on a suitable computer (computer not included) |
| Housing | Robust enclosure with carrying handle |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Differential Protection Relay
The relay makes the behaviour of three-phase differential protection visible: students apply faults inside and outside the protected zone and watch it trip or stay stable. Programming it for amplitude and vector matching also shows why transformer ratio and connection group matter in real protection schemes.
- B.E./B.Tech switchgear and protection lab: transformer differential protection.
- In-zone and out-of-zone fault tests to demonstrate relay stability.
- Magnetising inrush restraint during transformer energisation.
Fault circuits on the test set are mains-derived; connect leads with the supply off and work under qualified supervision.
Standard Scope of Supply
The Differential Protection Relay is supplied as one relay module in its enclosure with carrying handle, programmable from its own keypad. The computer is not included, and the Protection Relay Test Set or other power system product it connects to is a separate item; cables and optional accessories are listed on the quotation.
Packing, MOQ and Lead Time
Quotations can cover a single relay for a laboratory that already has the test set, or a complete protection bench. Each one lists packing, delivery time and price for the quantity you ask for, and further engineering lab equipment in India from the same range can share the quote.
Holding an Importer-Exporter Code as a registered exporter, Science Lab Supplies is able to ship to buyers in Qatar, Sri Lanka, Vietnam, Malaysia, Peru and Egypt. Send your requirement from the contact page or the enquiry cart; institutions buying by tender can start at the lab tender page.
Frequently Asked Questions
What can students protect with this relay?
It is set up for transformers, auto transformers, generators and other apparatus with two windings, covering the main differential exercises in a power systems course.
Is a computer needed to program it?
No. Settings can be entered with the keypad and display on the relay. Software on a suitable computer can also be used, but the computer is not included.
Who supplies the Differential Protection Relay?
It is supplied from Ambala, India by Science Lab Supplies, which can quote it with the test set and other relays.
Can it be tested alongside another relay?
Yes. Most tests need only one relay, but the Protection Relay Test Set has two sockets, so two relay modules can be tested at the same time.
Related Transformer Protection Items
Differential protection is usually taught on a transformer. The test set supplies the fault circuits, the mobile transformer gives a real three-phase winding to protect, and the other two relays let students compare differential protection with overcurrent and distance schemes.
- Protection Relay Test Set — desk test station that takes two relays for comparison.
- Three Phase Mobile Transformer — three-limb transformer with accessible tappings.
- Overcurrent And Earth Fault Relay — entry-level relay with 12 IDMT curves.
- Distance Protection Relay — relay for overhead transmission line protection.
Browse the full Electrical Power System range or all engineering laboratory equipment.
Last updated: 25 September 2026
