Over Current Relays

We are offering Definite Time Single Pole Over Current Relay (JRC912).

FEATURES

• Software based design
  
• Wide auxiliary supply
  
• Low burden

We are offering Numerical Directional Over Current Relay (JNP098/096/096P).

FEATURES

• Programmable characteristic angle

• Programmable operating characteristics

• High speed directional control

• Low Burden.

• Trip test facility

• Choice of four inverse curve and definite time

• Programmable for directional / non-directional

• RS232 communication port

• RS485 communication port (optional)

• History of 5 latest faults

• Self supervision facility

APPLICATION

The relay provides time graded directional phase earth fault protection of generators, transformers, capacitors, etc.

PRINCIPLE OF OPERATION

JNP 098/096/096P provides directional over current protection for power systems. Relay operating time is determined by selecting definite time characteristics or one of the four inverse time characteristics i.e. (3s normal inverse, 1.3s normal inverse, very inverse and extremely inverse). The operating region is defined by the characteristic angle selected. The relay measures the current and voltage from each of the phases and if the phase angle in the operating zone of the relay, then the relay extends trip signal.

TECHNICAL DATA

RATINGS
Current rating	1A and 5A
Voltage rating	110V, 50Hz For Phase
	63.5V, 50Hz For E/F
Auxiliary Supply	20 to 60V DC
	75 to 150V DC
	175 to 300V DC / 185 to 250V AC

SETTINGS
Inverse time curve	1) 3 Sec normal inverse curve
	2) 1.3 Sec normal inverse curve
	3) Very inverse curve
	4) Extremely inverse curve
Definite time	0.1 to 25.0 Sec in steps of 0.1s
Directional Feature	Separate Choice of Active / Inhibit mode for over current & Hi-set.
Characteristic Angle	Phase - 30°, 45°, and 60° lead E/F - 12.5°, 30° and 45° lag

 

We offers Numerical Over Current Relay (JNC068C).

FEATURES

• Programmable for 1A / 5 A relay rating

• 3 OC + 1 EF + 1 SEF/REF

• Choice of 6 IDMT curves and definite time

• Trip test facility

• History of 6 latest faults along with settings

• Self supervision facility

• 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 and earth fault (2 stage) protection with communication facility

PRINCIPLE OF OPERATION

The relay measures the line current from each of the line CTs and if the current exceeds the set threshold, then relay extends a trip signal after an operating time. The relay's "operating time" is determined by selecting "definite time" or one of the six "inverse time" characteristics.

Input to sensitive earth fault protection can be connected in two ways. First one the residual current derived from three phase current transformers, and second is low output core balance current transformer can be connected. Input to restricted earth fault protection will be derived from neutral CT output with external stabilizing resistor.

Phase over current, Earth fault, Sensitive earth fault/Restricted earth fault protections* features can be made active or inhibit independently.

TECHNICAL DATA

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 :	1) 3.0s Normal Inverse
& Earth fault)	2) 1.3 s Normal Inverse
	3) 1.5s Very Inverse
	4) 0.8s Extremely Inverse
	5) 0.6s Extremely Inverse
	6) 13.3s Long Inverse
	7) Definite Time
Phase OC (IDMT) :	50 to 200% in steps of 5%
Phase OC (Def time) :	50 to 500% in steps of 5%

 

We are engaged in offering Single Pole Over Current Relay.

APPLICATION

The relay provides earth fault protection of Generators, Motors, Transformers, Feeder etc., and where definite time protection is required.

PRINCIPLE OF OPERATION

The relay provides single pole over current protection for power systems. Relay operating time is deter­mined by set definite time. The relay measures the current from input CT and if it exceeds the set threshold, it extends a trip signal after the operating time, which is determined by set definite time. The relay output contacts are self reset type. TEST button facilitates testing of relay

TECHNICAL DATA

RATINGS
Current rating	1A/5A
Auxiliary Supply	20 to 60V DC
	75 to 175V AC/DC
	175 to 300V DC
	185 to 250V AC

SETTINGS
JRC 012 O/C setting	50 to 200% in steps of 10 %
JRC 032 O/C setting	25 to 400% in steps of 25 % or 50 to 800% in steps of 50%
Definite time setting	0 to 25s in steps of 0.1s

OVER LOAD RATINGS
Current input	2 times Rated continuous
	20 times Rated for 3 s
	40 times Rated for Is

BURDEN
Current input	0.2VA at Rated 5A
	0.05VA at Rated 1A
Aux. Supply	Less than 3W (Non Operated)
	Less than 5W (Operated)

ACCURACY
Operating value	± 5%
Operating Time	± 5% or ±20ms
Instantaneous time	Less than 40ms