Automotive Relays

We are offering Auto Recloser Control Unit (jnc257).

Features:
Three phase over current and earth fault protection.
Programmable operating charecteristics
Programmable auto reclosing facility.
Independent trip sequence setting (IDMT / Def time)
Under voltage blocking for breaker close
Trip counter.
Fault zone indication.
Breaker mal-operation indication.
Auto / Manual control.
Breaker status indication.
Trivector meter to record energy and Load parameters.
Ammeter and voltmeter with selector switch
Separate cabinets for control unit and meter unit,
which are mechanically fastened together
Cabinet suitable for different types of pole mounting.

Application:
Electrical Power for rural areas is supplied by 1 IkV overhead lines. They are exposed to several faults like, lightning, heavy wind, fall of tree branches, fault created by animals / birds etc. When a fault occurs, the
protection system trips the circuit breaker to prevent / minimize the damage. It is expected to locate the fault, clear and then restore the supply by reclosing the circuit breaker. It takes more time between power outage and restoration. More than 70% of the faults are observed to be temporary / transient in nature. Hence, power outage time can be reduced if the reclosing function is automated and carefully planned.

Principle Of Operation:
A circuit breaker whose tripping and reclosing functions are programmed and controlled automatically by an intelligent control unit is called as 'AUTO RECLOSER'. Auto Recloser can interrupt fault currents,and also programmed to reclose to restore the supply. The supply gets restored if the fault is of transient in nature. If the fault is of permanent type, the Auto Recloser tries to reclose the supply in two or three at­tempts (as set in the program) and finally goes to 'lock out' status, after which manual intervention is essen­tial.
The control unit is facilitated with manual control switches for circuit breaker trip and close operations. The circuit breaker status are indicated through indicating lamps. The operation of the circuit breaker is moni­tored by control unit after extending the trip / re-closing. The lockout contact will operate if breaker is mal-operated. The control unit has inbuilt trip counter which counts number of trips after installation. The count can be reset. The fault zone indicator is very useful only when several sectionalisers are used along the feeder. The zone numbers are based on time interval of closing the sectionahser from the time of closing of auto recloser. The zone number will be displayed on the display. Zone number gives very useful informa­tion to locate the faulty section of the feeder quickly. Inbuilt power pack will generate sufficient DC power supply required to operate circiot breaker.

The lockout contact will operate on following conditions.
1)On permanent fault.
2)Breaker mal-operation
3)Very low voltage.
4)Trip when unit is manual mode

We offers Auto Reclose Relay (JRV144).

Feature

• Software based design
• Built- in Auto / Manual selection facility
• No. of shots selectable
• High accuracy and stability

Application

The auto reclose function is normally used in feeder protection relays that are protecting an overhead line. Most of the overhead line faults are temporary in nature. Even 85% can be cleared by using the auto reclose function.

Principle of Application

The relay receives the fault initiation from the protection relay and that triggers the auto reclose function. After tripping the circuit breaker (CB), the Auto reclose function can reclose the CB. Normally , the first re­close (or shot) is so short in time that consumer cannot notice anything . However the fault is cleared and the feeder will continue in normal service. Even though the basic principle of Auto reclose is simple, there are a lot of different timers and parameters that have to be set.


TECHNICAL DATA

RATINGS

No. of shots	lshot or 2shot
Aux. Supply	1) 20 to 60V DC 2) 75 to 150V AC/DC 3) 175 to 300V DC 185 to 250V AC
SETTINGS
1 - Shot
Reclaim time	5 - 80s in steps of 5s
Dead Time	3s - 10s in steps of Is
2 - Shot
Reclaim time	20 - 320s in steps of 20s
Dead Time 1	10s - 80s in steps of 10s
Dead Time 2	30s- 170s in steps of 20s
BURDEN
Aux. Supply	Less than 5W (Non operated) Less than 7W (Operated)
ACCURACY
Operating Time	±5% or ±3 0ms whichever is higher

 

We are engaged in offering Auxiliary Relay (JRV131JRV151).

Feature

• Electromechanical design
• Plug-in construction
• Standardised contact arrangement
• Self or hand reset contacts
• Protective transparent cover for the element
• Compact panel mounting case

Application

switching functions in protection and control circuits contact multiplication.

DESCRIPTION

The auxiliary relays are electromechanical, attracted armature type, used in control and alarm circuits. There relays are designed as plug-in elements with the plug-in base having 16 terminals per element. Each element is enclosed in a dust proof moulded, transparent, polycarbonate cover. There is no hard wiring between the relay element and the rear terminals on the base. This results in a compact rugged and reliable design. Radio metal is used for the magnetic components such as the armature, the core and the yoke of the auxiliary relay to ensure good electrical performance. The contacts are made from phosphor bronze and are nickel plated. The contact tips are of pure silver. The use of these materials ensures very good contact performance.

Auxiliary relays are available in the following versions

Contact and flag arrangement	No. of elements/ relay type
	1	2	3
S/R contact and S/R or H/R or no flag or reverse flag	JRV 151	JRV 152	JRV 153
H/R contact and H/R flag	JRV 161	JRV 162	JRV 163
2 pairs S/R+2 Pairs H/R Contacts and H/R flag	JRV 131	JRV 132	JRV 133

TECHNICAL DATA

RATINGS
Rated voltage	24,30, 48, 110, 220 V DC or 63.5, 110 or 230v, 50Hz AC
Operating range	75-120% of rated voltage for DC relays 80-115% of rated voltage for AC relays
Reset value	Above 10% of the rated voltage
Burden	4 watts(maximum) at rated voltage
Operating time	Less than 20 ms at rated voltage(nominal)
Reset time	less than 10 ms

 

We are offering Pt Fuse Failure Relay (JRV123).

Feature

• Solid state reliability
• High speed operation
• Very high load impedance operation

Application

The relay monitors the healthiness of PT fuses.

PRINCIPLE OF OPERATION

The relay consists of sensing the voltage across each of the fuses separately. In normal condition, the poten­tial across the fuses is nearly zero. On opening out of the fuse the potential across the particular fuse goes up. This potential drives current through the LED of the opto-coupler. The opto-coupler gets switched on due to the current in the opto-coupler provides circuit path for external LED indication and as well for the electromagnetic relay. The sensing circuit comprising of the opto-coupler and the associated driving circuit is separate for each phase. However, the electromagnetic relay providing potential free contacts for alarm and control is common for all the 3 phases.

TECHNICAL DATA

RATINGS
Rated voltage	110VAC, 50Hz. 3 phase
Load impedance	Load impedance between phases should not be more than 2 OK Ohms
Operating time	Less than 10 milli seconds between the opening of fuse and closing of the open contact of electromagnetic relay
Auxiliary Supply	20 to 60V DC
	75 to 150V AC/DC
	175 to 300V DC / 185 to 250V AC

OVER LOAD RATINGS
Voltage	120% of rated voltage continuously

BURDEN
Input voltage	4 VA (maximum) at 110 V AC with zero load impedance
Aux. Supply	Less than 3W (Non Operated)
	Less than 6W (Operated)

CONTACT RATINGS
Rating	10A at 24V DC/230V AC

We are offering High Speed Tripping Relays (JRV171JRV181).

Feature

• Electromechanical design
• Plug-in modules
• Screw terminals
• Self or hand reset contacts
• Protective transparent cover for the element
• Compact flush mounting case

APPLICATION

High speed tripping functions requiring a number of simultaneous switching operations, interlocks in control and closing circuits

Description

High speed tripping relays are electromechanical, attracted armature type, used in control and alarm cir­cuits. There relays are designed as plug-in elements with the plug-in base having 16 terminals per element. Each element is enclosed in a dust proof moulded, transparent, polycarbonate cover. There is no hard wiring between the relay element and the rear terminals on the base. This results in a compact rugged and reliable design. Radio metal is used for the magnetic components such as the armature, the core and the yoke of the relay to ensure good electrical performance. The contacts are made from phosphor bronze and are nickel plated. The contact tips are of pure silver. The use of these materials ensures very good contact perfor­mance. Each element can be offered as - 3 NO + 1 NC or 2 NO + 2 NC to be specified while ordering.

High speed tripping relays are available in the following versions :

Contact and flag arrangement	No. of elements/ relay type
	1	2	3
S/R contact and S/R flag	JRV 171	JRV 172	JRV 173
H/R contact and H/R flag	JRV 181	JRV 182	JRV 183

TECHNICAL DATA

RATINGS
Rated voltage	24,30, 48, 110, 220 or 250 V DC
Operating range	50-120% of rated voltage
Burden	25 watts (maximum) at rated voltage
Operating time	Less than 10 ms at rated voltage (nominal)
Operation indicator	Hand reset mechanical flag
Contacts	4 NO + 1NC or 2NO + 3NC S/R or H/R
CONTACT RATING
Make & Carry continuous (AC - DC)	2500 VA with maxima of 5 A and maxima of 660 V AC
	2500 W with maxima of 5 A and maxima of 660 V DC