Percentage Biased Differential Relay Trainer (Electromech / Numeric) Manufacturer,Supplier and Exporter in India
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Product Code : SCL-EELE-12855
Indian Lab Suppliers supplies the Percentage Biased Differential Relay Trainer (Electromech / Numeric) (Product ID: 12855) as part of its electronics engineering lab equipment range. It is a protection trainer for testing a percentage-biased differential relay on a three-phase transformer, with electromechanical or numerical relay options.
Quick Answer
A 415/230 V, 1 kVA star/delta transformer is protected by a high-speed biased differential relay (1 A, bias settings of 15, 30 and 45% by plug taps, 110 V DC auxiliary) fed from six 5/5 A CTs. Two voltage and current injector panels, two over-current and elapsed-time panels with 1 ms resolution and two bidirectional three-phase meters form the built-in test kit, so no separate relay test set is needed. Students plot the biased characteristic using the Merz-Price circulating-current principle, run pick-up tests, and confirm that in-zone faults trip the relay while through (out-of-zone) faults do not. The trainer works from a 415 V three-phase DOL starter panel, so tests must be run with qualified supervision.
Key Specifications
| Parameter | Detail |
|---|---|
| Relay | Biased differential, electromechanical or numerical; 1 A; bias 15/30/45%; aux 110 V DC |
| Protected transformer | 415/230 V AC, 1 kVA, star/delta |
| CTs | 6 × 5/5 A |
| Test panels | 2 V/I injectors (230 V/1 A dimmer, 0-2-8 V/12 A transformer); 2 timers with 20 A ammeter, 1 ms resolution |
| Metering | 2 bidirectional 3-phase multifunction meters (RS-485 Modbus optional) |
| Input panels | 3-phase DOL starter (415 V/2 A MCB, 9 A contactor, 1.4-2.3 A overload relay); 1-phase input with bulb load |
| Loads | Tapped AC/DC resistor bank 100-750 Ω, 400 W; 3 × 600 W resistors 100-225 Ω |
| Dimensions | 1165 (L) × 300 (W) × 990 (H) mm |
| Optional | 3-phase variac, 3 A |
Where This Is Used
Used in power system protection labs at undergraduate and postgraduate level; related trainers are the Feeder Management Relay Trainer (Numerical) (Product ID: 12858) and the Distance Protection Relay Trainer (Product ID: 12856). Related items: Differential Relay Testing System (Product ID: 12980). Browse the full Electronics Engineering Lab Equipment range or related Electricity and Magnetism products.
Frequently Asked Questions
What bias settings does the relay have?
15%, 30% and 45%, set by plug taps.
Is a separate relay test kit needed?
No, the injector and timer panels are built in.
Which faults are demonstrated?
In-zone faults that trip and out-of-zone faults that should not.
Related Categories
Electronics Engineering Lab Equipment · Electricity and Magnetism · Engineering Lab Equipment
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