Biased Differential Relay Trainer set

Biased Differential Relay Trainer set

MAKE DINESH SCIENTIFIC MODEL DS-2001

DESCRIPTION

The biased-differential relay is a low-impedance relay and compares with the high-impedance relay as follows: Advantages of biased scheme: Can operate with CTs with a lower knee point and less accuracy, since the relay is of a low-impedance type. The bias feature compensates for any CT.

Will Consist Of The Following Features:

Facilitates differential protection of transformer or using differential relay & characterization of different relay.

• Each of above trainer has built in requisite relay testing kit typically consisting of voltage injector, current injector, elapsed time counter (1 msec resolution), trip relay logic etc.
• The Trainer need a few set of associated relay testing (current / voltage injection etc.) panels (7-8 nos. typically) which are mounted in a light weight sturdy aluminum profile flat demo panel system. Do not need any separate testing kit.
• Facilitates easy & safe wiring by students due to use of 4mm sturdy Shrouded banana patch cords & shrouded socket arrange-ments for high voltage circuits
• Each panel has ABS molded plastic sturdy enclosure, & colorful screw less overlays showing circuits diagrams & its connection tag numbers for easy understanding & connection
• Useful for Post Graduate projects & research purpose.
• Set of Instructor Guide & Student Workbook

Technical Specifications of interfacing panels:

Aluminum profile sturdy Flat panel system carrying various high voltage components housed in plastic enclosures to minimize shock possibility.

Input 3 phase DOL Starter panel

Will consists of

• 4 pole MCB of 415 V/2A .
• DOL 9A Contactor with 230V / 50 Hz / 11VA COIL .
• Bimetallic thermal O/L relay with range 1.4A – 2.3A .

1 phase AC input supply panel

Will consists of

• 1 phase MCB of 4A/1.6A – 2 nos.
• Bulb load

Variable voltage & current Injector panel =2 nos.

Will consists of

• 1 phase dimmer of rating 0-230VAC/0.75A.
• Toroidal current injecting transformer of 100VA with primary 230VAC/1A, secondary-0-2- 8V/12A.
• All connections of dimmer & transformer will be brought out on shrouded sockets for easy connection.

3 Phase Bidirectional Power cum Energy meter panel = 2 Nos

Will consists of

• Bidirectional Multifunction
• 3 phase 3/4 wire, 415VAC, CT Input 5A
• LCD/LED display, Aux. supply 230V, 45-65Hz,5W,
• V, I, Hz, Pf, KVA, KW, KWH.
• Modbus RTU RS 485 connections.

Over current measurement & Elapsed time counter panel =2 nos.

Will consists of:

• AC ammeter of 0-20A range, Aux. supply 230VAC, Display: 0-19.99.
• Elapsed time counter with display range 999.999 of resolution of 1msec. Will have facility to freeze time.
• Will have start-stop push buttons, provision to connect trip NO contact from protection relay.

Differential Relay Panel

All connection of relay will brought out on this panel & will consists of:

• 2 NO Trip contacts
• Supply 110VDC/230VAC

CT panel

Will consists of

• 5/5 Amp. CT 6 Nos.
• Primary side of CTs connection will brought on 3 x 2 x 2 SBS-5 sockets.
• Secondary side of CTs will be Star connected in group of 3 & brought out on 4 x 2 SBS-5 sockets.

415/230VAC, 1KVA, Star/Delta Transformer Panel

Will consists of 415/230VAC, 1KVA, Star/Delta transformer Panel

Consists of all the connections of transformer primary & secondary will brought on SBS5 on the top of panel.

Resistor Load (Table Top panel)

Will consists of AC/DC Resistors 750E/600E/300E/212E/162E/ 125E/ 112E/100E/400W /8

taps + OFF + separate 60E tap for DC series Gen.

Resistive Load panel (Table Top panel)

Will consists of 3 nos. of 600W resistors with switch selectable 7 nos. of taps at 100, 112, 125, 150, 175, 200 & 225 Ohm

Protection relay type (Numeric) :

Will consists of Numeric type High speed biased differential relay current rating 1A, with biased setting of 15%, 30 & 45% by plug board taps, Aux. supply 110VDC. 

The above trainer will cover following experiments:

• To plot characteristics of % biased differential relay.
• Pick up test for differential relay.
• Transformer protection using differential relay for in zone trip faults.
• Transformer out zone or non trip faults.