TR-7576-C Transformer Protection Relay with 6 Channel Temperature Scanner

The model TR-7576 is designed for safe operation of medium voltage cast resin / dry type transformer. It is suitable for control room as well as marshalling box installations and is built for long and trouble-free operation under extreme conditions of service associated with transformer.
Three numbers of user settable set-points can be used to control the cooling fan, to warn the user of high temperature and to shut down the transformer in case of excessive heating.
Six nos. of Pt-100 RTD sensors allow the user to monitor the temperatures of six windings located suitably in transformer.
TR-7576 is programmed to note and store maximum temperature of the winding. Facility extends to recall this information and to clear it for fresh recording.
TR-7576 has one analog output signal (4-20mA). This can be configured to represent the temperature of any of the six channels or the temperature of the hottest channel.
TR-7576-C is provided with facility for computer communication using RS-485 with MODBUS RTU slave protocol, in lieu of 4-20mA signal.

Technical Specifications

Inputs : 6nos. of RTD sensors [Pt-100, IEC-60751)
No. of Set-points : Three (Alarm, Trip & Fan On.)
Temperature indication range: -20 to 250°C
Set point range : 20to 220°C
Accuracy : 41°C
Dead Band [relay differential): Fan &Trip:8°C, Alarm:5°C (Factory set}
Display Speed : 4seconds [Factory set]
Display : 1Seven Segment 1/2" displays for displaying channel number
3 Seven Segment 1/2" displays for displaying Temperature

Mechanical

Overall Dimensions : 215 (H) x 265 (W) x 130 (D) mm
Mounting : Wall mounting by 3 nos. Mé Screws
Weight : 3.5 kg approx. (unpacked)
Enclosure : M.S. Sheet Box, powder coated, with acrylic viewing window (IP-52])

Electrical

Supply Voltage : 90-270 VAC/DC [Optionally 20 - 50 VAC/DC)
Outputs : - Four relay contacts (N/O contact} - Fault, Fan, Alarm & Trip
- One analog 4-20mA output in TR-7576 (corresponding to 0 to 200 °C
max. load 300 ohms, linearity 0.5% w.r.t. local indication)
- RS-485 communication (1KVDC isoated) with MODBUS RTU slave
protocol in model TR-7576-C.
Contact Racting : For resistive load, 5A @ 230VAC & 0.5A @ 125VDC
For inductive load, 5A @ 230VAC (coso = 0.4) & 0.3A @ 125VDC (L/R=7msec).
Relay operations _: Fault: Will energize after few seconds of power-on and de-energinze on de-tecting fault condition. Fault relay will remain on in normal conditions.
Fan: Will energize if any channel's tmeperature reaches fan set point .
This relay will also turn on as per fan exerciser set timings, if this
function is enabled.
Alarm: Will energize if any channel's temperatrure reaches alarm set point.
Trip : Will energize if any channel's temperature reaches trip set point.
Terminals : Screwed Caged suitable for 2.5 sq. mm solid conductors.
Insulation : Insulation resistance shall be 100 Mohm or more when 500 VDC is
applied between each terminal shorted together and earth.
Controller will withstand 2 KV rms at 50/60 Hz. for1 min., applied
between all relay & supply terminals shorted together & earth.
Power consumption : Max. 15VA
Environmental
Operating conditions : Amb.Temp. : -20 °C to 70°C, R.H. : 95% Max non-condensing.
Storage Temp. : -20°C to 85°C
Test conditions : Amb. Temp. : 27 °C+5°C, R.H. : 20 - 80% non-condensing.
Vibration : 10-150 Hz, 0.004" displacement