Numerical Current & Auto Recloser JNC 268

OVERVIEW

    Features

  • Suitable for 1A / 5A relay rating
  • Choice of 5 IDMT curve and definite time
  • Programmable Over current relay or Over current relay with multi shot auto re-close
  • Trip test facility
  • History of 6 latest faults
  • Self supervision facility
  • Independent trip sequence setting (IDMT / Def. time)
  • Breaker status monitoring
  • Standard dimension – 144mm x 144mm
  • Disturbance records (DR) in IEEE COMTRADE format
  • Event Records ( ER )
  • MODBUS open protocol over RS – 485 port
  • MODBUS protocol over RS – 232 port
  • Draw out facility with inbuilt CT shorting
  • Standard dimension – 144mm x 144mm

Application:

The relay provides time graded phase, earth fault protection along with multi shot auto re-closer and SCADA capability.

Numerical Current
& Auto Recloser
JNC 268

Principle of Operation:

The relay measures the line current from each of the phases and if it exceeds the set threshold, then relayextends a trip signal after an operating time. The relay's operating time is determined by selecting definite time OR one of the five inverse time characteristics.

Multi shot auto-re-closer facilitates automation related to closing of a breaker. Auto re-closer functionality can be programmed to provide a maximum of five shots. Dead time starts only when phase or earth fault trip occurs. After an elapse of a time interval equal to dead time, closing command will be extended. The reclaim time timer starts at the instant the dead time timer expires. If, after extending the “breaker close” signal an over current fault was detected before the reclaim time timer reached its terminal count, then the relay understands that the fault in the system is still persisting and the over current relay will issue a trip signal. The relay tries to close the breaker for a maximum of the programmed number of shots beforeit choses to lockout.

 

SPECIFICATIONS

Ratings:

Current rating ( In )

:

1A / 5A ( Site selectable)

Aux. Supply

:

1) 20 to 60V DC
2) 80 to 260V AC / DC

     

Settings:

Operating characteristics
(Separate for Phase &
Earth fault)

:

3.0s Normal Inverse
1.3s Normal Inverse
1.5s Very Inverse
0.8s Extremely Inverse
13.3s Long Inverse
Definite Time

Relay Configuaration

:

Over Current & EF relay (OCEFR)
OCEFR with Auto-re-closer

Phase O/c (IDMT)

:

50 to 200% in steps of 5%

Phase O/c (Def time)

:

50 to 500% in steps of 5%

Earth fault (IDMT)

:

15 to 80% in steps of 1%

Earth fault (Def. time)

:

15 to 100% in steps of 1%

TMS (Ph & E/F)

:

0.02 to 1.0 in steps of 0.01

Definite time
(Phase, E/F)

:

0.1s to 25.0s in steps of 0.1s

Phase Hi-set

:

200 to 3200% in steps of 100%

Earth fault Hi-set

:

50 to 1000% in steps of 50%

Hi-set operating time

:

0 to 500ms in steps of 50ms
(0 – Instantaneous)

Max. Shots (reclosing)

:

Maximum of 5

Dead time 1 to 5

:

0.5 to 250s In steps of 0.1s

Reclaim time

:

10 to 250s in steps of 1s

Cold load pickup (CLP)

:

2 to 16 times the O/c (IDMT)

CLP Delay

:

0.05s to 1.0s in steps of 0.01s

Line CT Primary

:

In to 2500A

Line CT Secondary

 

1A or 5A (relay rating)

breaker monitoring (Site
selectable)

:

52a monitoring or
52b monitoring or
None

Protection

Ph

:

Only Phase protection enabled

EF

:

Only E/F protection enabled

Both

:

Both Phase and E/F enabled

RS232 communication

:

MODBUS Protocol 9-Pin D
type connector at relay front face

Rs485 communication

:
:

MODBUS Protocol Isolated
Rs485 terminals at relay rear end

No. of Disturbance records
(DR)

:

Two

 

 

 

 

Mechanical Design :

Weight

:

2.5 Kgs.(Approx)

Case Size

:

Fascia 144mm x 144mm
depth 232mm

Installation

:

Flush mounting

Panel cutout

:

138mm x 138mm

     

Accuracy:

Operating
value(IDMT)

:

105% to 125%

Operating value
(Def time)

:

95% to 115%

Hiset operating
value

:

±7% or ±30ms whichever is higher

Drop-off / pick-up

:

Between 70% to 98%

Operating time

:

±5% or ±30ms whichever is higher
±7% or ±30ms whichever is higher,
for 0.8s EI, 1.5s VI & 13.3s LI characteristics.

     

Contact Ratings:

Trip / Lockout

:

10A at 24V DC / 230V AC

Self Supervision

:

10A at 24V DC / 230V AC

Breaker close
relay

:

10A at 24V DC / 230V AC

     

Contact Durability :

Loaded contact

:

100,000 operations minimum

Unloaded contact

:

1000,000 operations minimum

     

Over Load Rating:

Current input

:

2 times rated continuous
20 times rated for 3s
40 times rated for 1s)

 

 

 

Burden:

Current input

:

0.4VA per phase (Rated 5A)
0.05VA per Phase (Rated 1A)

Aux. Supply

:

Less than 8W (Non operated)
Less than 12W (Operated)

     
 

Numerical Current
& Auto Recloser
JNC 268

 

DOWNLOADS

Numerical Current & Auto Recloser JNC 268

Catalogues:

DOWNLOAD

Operating Manual:

DOWNLOAD

 

Numerical Current
& Auto Recloser
JNC 268

 

ORDERING INFO.

Ordering Information:

Relay type

:

JNC 268

Auxiliary supply

:

20 to 60V DC
80 to 260V AC / DC

 

 

 

 

Numerical Current
& Auto Recloser
JNC 268

 

A WebSpotLight creation by Netsoft.