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. It can be used to investigate the protection of transformers, auto transformers, generators and other two-winding apparatus, connected to the Protection Relay Test Set or other modules of the power systems range. Power systems laboratories in engineering colleges and polytechnics, as well as tender contractors and distributors, can source it from Science Lab Supplies, whose Ambala, India office prepares the quotation and dispatch.
Specifications
The rows below break the differential relay down one feature at a time. In short, it is a numerical module in a robust carrying enclosure that rests on the desk of the test set or another power system product, takes its supply through a rear multi-core cable and reaches the test circuits through 4 mm shrouded sockets.
| Specification | Value |
|---|---|
| SKU | LSK-EPS-10531 |
| Relay type | Numerical three-phase differential protection relay, educational format |
| Protected apparatus | Transformers, auto transformers, generators and other two-winding apparatus |
| Out-of-zone faults | High stability |
| Zero-sequence current filtering | For each winding |
| Operating speed | High-speed operation |
| Magnetising inrush | Restraint function |
| Matching | Amplitude and vector matching |
| Compatible equipment | Protection Relay Test Set and other modules of the power systems range |
| Mounting | Desk area of the test set or other power system product |
| Supply connection | Multi-core cable from the back of the relay |
| Test circuit connection | 4 mm shrouded sockets |
| Programming | Keypad and display on the relay |
| Software programming | Software on a suitable computer (computer not included) |
| Simultaneous testing | Test set has two sockets for two relay modules |
| 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.
- Generator protection exercises, linked to machine theory taught on the Salient Pole Generator.
- Contrasting differential protection with the fuses and circuit-breakers tested on the Circuit Breaker Trainer.
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. Tell us which test set or power system product the relay will join through the contact page, or list it in the enquiry cart; tender buyers will find the process on 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, from inrush restraint to in-zone and out-of-zone fault tests.
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?
The relay is quoted and dispatched by Science Lab Supplies from Ambala, India. It can be priced alone for an existing protection bench or listed together with the test set and the other relays of the range.
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 and Protection Equipment
A two-winding transformer is a natural object for differential protection. The test set supplies the fault circuits, the transformers and trainer give real windings to protect, and the other relays let students compare differential protection with overcurrent, feeder and distance schemes on one quotation.
- Protection Relay Test Set — takes two relays at once for discrimination experiments.
- Three Phase Mobile Transformer — three identical transformers on a common core forming a three-limb unit.
- Single Phase Mobile Transformer — three separate transformers with tertiary windings, usable singly or as one three-phase bank.
- Transformer Trainer — one delta-star, one three-phase educational and three single-phase educational transformers.
- Overcurrent And Earth Fault Relay — adds thermal overload, broken conductor detection and undercurrent functions.
- Distance Protection Relay — protection and monitoring of overhead transmission lines.
- Feeder Management Relay — four overcurrent stages, the first two settable to any of ten IDMT curves.
Browse the full Electrical Power System range, the Electrical and Electronics range, or all engineering laboratory equipment.
Last updated: 22 October 2026
