350 Feeder Protection System

Features related to each order number are subject to change without notice.

Arc Flash System

The 350 protection relay with Input/Output option “A” supports up to 4 Arc Flash sensors,

which are ordered separately so that the connected sensor fiber lengths can be

customized

The total sensor fiber length connected to each loop sensor must not exceed 70 meters of

single sensor fiber. Black sensor fiber is duplex, and must be doubled in calculations.

For example, a loop sensor with a 25 meter transparent sensor fiber plus a sensor fiber

extension of 10 meters would have a total of 2 x 10m + 25m = 45m of single sensor fiber.

FASTPATH: The total sensor fiber length connected to each point sensor must not exceed 35 meters of

black (duplex) cable.

NOTE

NOTE: Generally each loop sensor is used with a sensor fiber extension, in order to minimize

exposure to ambient light when running the sensor fiber between cabinets. A duplex

sensor fiber extension connects the relay to the loop sensor, and can be gently pulled

apart to connect to the loop sensor connectors if they are not adjacent. Consider your

installation needs carefully when ordering sensor and extension lengths.

Empty chassis

The 350 protection relay chassis used with a drawout relay is available separately, for use

as a partial replacement or in test environments. Many features are supported by the

cards and ports within the chassis, as is reflected in the chassis order code.

NOTE

NOTE: The chassis order code and drawout relay order code must match exactly.

FASTPATH: A drawout relay cannot be used in a chassis with different order code options.

Other accessories

• 1819-0103 350 Retrofit Kit for 735

• 1819-0102 350 Retrofit Kit for IAC Relay

• 1819-0101 350 Retrofit Kit for MDP Relay

• 1819-0100 350 Retrofit Kit for S1/S2 Cut-Out

• 18L0-0075 3 Series Depth reducing collar - 1.375”

• 18L0-0076 3 Series Depth reducing collar - 3.00”

• 18L0-0080 3 Series IP20 Kit

• 3S-NDO-STCONKIT 3 Series NDO straight terminal block kit

• 0804-0458 USB A-B configuration cable - 6’

NOTE

NOTE: Refer to the 3 Series Retrofit Instruction Manual for the retrofit of Multilin MI, MII, MLJ, and

TOV relays.

Specifications

NOTE

NOTE: Specifications are subject to change without notice.

NOTE

NOTE: All accuracies defined below are at nominal frequency (50Hz or 60Hz) unless otherwise

stated.

NOTE

NOTE: To obtain the element operating time delay, i.e. from fault injection until operation, add the

operate time to the curve time.

To obtain the total element operating time, i.e. from the presence of a trip condition to

initiation of a trip, add 8 ms output relay time to the operate times listed below, with the

exception of Arc Flash SSR loads.

Password security

PASSWORD SECURITY

Master Password: ...............................................8 to 10 alpha-numeric characters

Settings Password:.............................................3 to 10 alpha-numeric characters for local and remote

access

Control Password: ..............................................3 to 10 alpha-numeric characters for local and remote

access

Protection

BROKEN CONDUCTOR (I1/I2 OR 46BC)

Minimum operating positive current:........0.05 to 1.00 x CT in steps of 0.01 x CT

Maximum operating positive current:.......0.05 to 5.00 x CT in steps of 0.01 x CT

Pickup level:...........................................................20.0% to 100.0% in steps of 0.1%

Dropout level:........................................................97% to 98% of the pickup level

Pickup time delay:...............................................0.000 to 65.535 s in steps of 0.001 s

Timer accuracy: ...................................................± 3% of delay setting or ± ¾ cycle (whichever is greater) from

pickup to operate

Operate time:........................................................<30 ms at 60 Hz

WATTMETRIC GROUND FAULT (32N)

Measured power:................................................zero sequence

Number of elements: ........................................1

Characteristic angle: .........................................0º to 359º in steps of 1°

Pickup threshold:.................................................0.001 to 1.200 pu in steps of 0.001 pu

Pickup level accuracy: ......................................± 2% or ± 0.03 pu, whichever is greater

Hysteresis:..............................................................3% or 0.001 pu, whichever is greater

Pickup delay: .........................................................Definite Time (0.00 to 600 .0 s in steps of 0.1 s), Inverse Time,

or Flexcurve

Inverse time multiplier:.....................................0.01 to 2.00 in steps of 0.01

Curve timing accuracy: ....................................± 3.5% of operate time or ± ¼ cycle (whichever is greater)

from pickup to operate

Operate time:........................................................<30 ms at 60 Hz

Mechanical installation

This section describes the mechanical installation of the 350 system, including dimensions

for mounting and information on module withdrawal and insertion.

This equipment is Suitable for mounting on the flat surface of a Type 1 Enclosure

Dimensions

The dimensions of the 350 are on the following pages. Additional dimensions for mounting

and panel cutouts are shown in the following sections.

1. Mount the collar of required depth (1.375” or 3”) to the unit (captive or non-drawout)

using 4 screws (see above).

2. Mount the combination of unit and collar to the panel using 4 screws as shown above.

Figure 2-7: Mounting tabs (optional)

1. From the front of the panel, slide the empty case into the cutout until the bottom tab

clicks into place (see above).

2. From the rear of the panel screw the case into the panel at the 8 screw positions

shown above.

3. If added security is required, bend the retaining "V"tabs outward, to about 90°. These

tabs are located on the sides of the case and appear as shown above.

The relay can now be inserted and can be panel wired.

BOTTOM

To avoid the potential for personal injury due to fire hazards, ensure the unit is

mounted in a safe location and/or within an appropriate enclosure.

The adaptor plate for mounting the 350 directly over the existing S1/S2/MDP/IAC or SR735

mounting plate, is shown below:

IP20 Cover (optional)

The IP20 cover minimizes potential dangers to users by preventing finger contact with

electrical connections at the back of the 3 Series drawout units.

Attaching the cover

The steps for attaching the IP20 cover (optional) to the drawout unit are as follows:

Figure 2-13: IP20 Cover mounting - Drawout unit only

1. Place 4 custom standoffs (item#1) using the suggested tightening torque of 8lb-in in

the following order:

A. Remove the 2 mounting screws near letters A and C, of label ABC (item#2), and

mount 2 standoffs.

B. Remove the 2 mounting screws near the letters B and E, of label ABCDE (item#3),

and mount 2 standoffs.

2. Place the IP20 cover (item#4) and secure it with 4 screws (item#5) using the suggested

tightening torque of 8lb-in.

NOTE

NOTE: Make sure the device terminals are wired before placing the cover. Use the 5 slots located

on each side of the cover to guide the wires outside of the cover.

Retrofit kit for IP20

Before attaching the cover, remove the old labels from the device (see item#2 and item#3)

and replace them with the new labels from the retrofit kit. Attach the cover as described in

the previous section.

Arc flash sensors

Arc flash sensors house the fiber optics that are used to detect the arc flash. Mounting

details depend on the sensor type (point or loop).

For detailed installation, testing and maintenance guidance for Arc Flash sensors, see GET-

20057 3 Series Arc Flash Application Note.

If the relay is used in the computation for reducing the Hazard Reduction Category

code, operands for sensor failures must be assigned to an auxiliary output relay which

must be connected into the control logic of the breaker equipment to ensure safe

operations when the output relay is asserted. In the event of this assertion, the Hazard

Reduction Category code cannot be maintained unless backup protection is continuing

to maintain it.

CAUTION: This product uses optical electronic devices (line or point sensors) to sense arc flash

fault conditions. It is recommended to follow proper housekeeping measures &

establish a regularly scheduled preventive maintenance routine to ensure proper

device operation. For maintenance recommendations, see GET-20057 3 Series Arc

Flash Application Note

Arc flash sensors are available in two different configurations, point and loop. Loop sensors

can be used with a black-coated sensor fiber extension to connect the ends of the loop

sensor to the 350 relay through panels up to 51 mm (2 inches) thick