Transformer Protection Relay TR-7570

(FOR RESIN CAST / DRY TYPE TRANSFORMERS)

Temperature

CChannel

Set

Max.

Fault High V. High Fan

Auto

Manual

Press RESET for moreto RESET Max. Temp

than 3 secs.

R

electronicsP E C O N

Max.

Enter

Set

Reset

Transformer Protection Relay TR-7570

Power Electronics & Control,.Ahmedabad-382 330.

Func.

Esc.

+

-

23

0V

110

V

Aux.

N

RTD 1 RTD 2 RTD 3 RTD 4 Fault High Very High Fan Remoteo/p.

~ ~

Supply

Temperature

CChannel

Set

Max.

Fault High V. High Fan

Auto

Manual

Press RESET for more than 3 sto RESET Max. Temp

R

electronicsP E C O N

Max.

Enter

Set

Reset

Power Electronics & Control,.Ahmedabad-382 330.

Func.

Esc.

+

-

23

0V

110

V

Aux. Supply

N

RTD 1 RTD 2 RTD 3 RTD 4 Fault High Very High Fan Remoteo/p.

~ ~

TR-7570

Reset

Transformer Protection Relay

P E C O NR

electronics

Power Electronics & ControlAhmedabad : 382 330 Max. Temp.

Standard Features: * Single scanner unit for three windings and fan Control.

* Four output relays for Alarm (High), Trip (V.High), Fan on/off (Fan) &

to warn against sensor open or wrong sensor connection (Fault).

* Bright digital display offers accurate and unambiguous reading.

* Better vibration withstanding capability.

* µC and solid state design offers high reliability.

* IP-52 Enclosure

* Memorizes max. temperature.

* Low power requirement.

* Extremely high noise immunity.

Doc

no.

: 0

7 0

5 1

1 0

1 The model TR-7570 is designed for safe operation of medium voltage cast resin / dry type transformer. It is suitable for control room as well as marshalling box installation 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. Four numbers of Pt-100 RTD sensors allows the user to monitor the temperature of all the three phase windings plus one other critical point on the transformer like core. Alternatively, it can be used to check the ambient temperature or can be left for use as spare.

Power Electronics & Control 145/2, G.I.D.C. Estate, Naroda, Ahmedabad - 382 330 INDIA Tel: + 91 (79) 2281 3432, 2281 7892 Fax: +91 (79) 2282 1397 emai l : pecon@vsnl .com Websi te : www.pecon- ind ia .com

R

TR-7570 is programmed to note and store maximum temperature of the winding. Facility extends to recall this information and to clear it for fresh recording. The maximum Temperature is saved such that it can be recalled even after the power for the unit fails. It also has a facility to keep displaying only the maximum temperature of all the channels thereby facilitating easy supervision. Technical Specifications

Inputs : 4 RTDs (Pt-100, IEC 751) No. of Set-points : Three (High, V.High & Cooling Fan On.) Temperature indication range: - 50 OC to 300 OC Set point range : 0 to 299 OC Accuracy : ± 1 OC Dead Band (relay differential) : User settable (range: 1 - 25 OC) Display Speed : User Settable (range 1 - 60 secs) Display : 3 Seven Segment 1/2" red LEDs for displaying temperature 1 Seven segment 1/2" red LED for displaying channel no.

Mechanical Overall Dimensions : 215 (H) x 265 (W) x 130 (D) mm Mounting : Wall mounting by 3 nos. M6 Screws Weight : 3.5 kg approx. (unpacked) Enclosure : M.S. Sheet Box. with acrylic viewing window Electrical

Supply Voltage : 90-270 VAC/DC OR 20-50 VAC/DC Outputs : Four (1 C/O) Relays & 1 analog output (4 - 20 mA for 0 – 300 OC, Linearity ± 0.5%, Max. resistance load 300 ohms). Contact Racting : for res. load 5A/250VAC, 250W at 125VDC for L/R = 7 msecs, 5A/250V AC, 125W at 125VDC

Relay operations : Fault : When power is applied to TR-7570, this relay energizes. The relay will de-energize if any of the rtd is open or short or if any of the rtd is out of temperature indication range. High : To energize if any one Channel has crossed High set point V.High : To energize if any one Channel has crossed V.High set point Fan : To energize to start the cooling fan. Terminals : Screwed Caged suitable for 0.2 - 4 sq. mm solid conductors. Insulation : Insulation resistance shall be 100 Mohm or more when 500VDC is applied between each terminal in turn and enclosure. Controller will withstand 2 KV rms at 50 Hz. for 1 min., applied between all relay & supply terminals shorted together and enclosure.

Power consumption : Max. 10VA Operating conditions : Ambient Temp. : -20 OC to 50 OC. R.H. : 95% Max non-condensing.

Storage Temp. : -20 OC to 85 OC.

Test conditions : 60% ±20% R.H., Amb. Temp. 27 ±5 oC.