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T2800 Overcurrent or Earth Fault Relay

• Protection of generators against earth

faults or overcurrent

• Visual indication of power, pick-up

and relay tripping

• Wide range of settings for current and

delay, both in two steps.

• High precision digital countdown

timer for delayed output

• Accepts high supply voltage

variations: 60 - 110%

• Cost effective and highly reliable

compact design

• 50 hours burn-in before ﬁnal test

• Operating temperature range:

-20°C to +70°C

• Flame retardant enclosure

• DIN rail or screw mounting

Application

The T2800 Overcurrent or Earth Fault

Relay has a broad application as an earth

fault or a single phase overcurrent detec-

tion relay. It has a wide setting range for

protection, control and monitoring.

The T2800 is part of the SELCO T-Line

series with modular units for protection,

control and monitoring of generators.

Function

The T2800 detects the magnitude of the

current and, if this exceeds the preset

level (0.02 - 2 x I

), the pick-up LED will

indicate and the delay timer will be

started.

After the preset time (0.1 - 10 sec.) has

expired the output relay and the

corresponding LED will be activated,

provided that the current level was

exceeded for the entire delay time.

The T2800 has a normally energized

output relay. The relay is a latching

relay which can be reset or disabled.

Installation

The supply voltage is connected to

terminals 1 and 3 or terminals 2 and 3,

according to the supply source.

The T2800 is connected to the measu-

ring current coming from the current

transducer(s) secondary via terminals

5 and 6. See application diagram.

The latching of the output relays is reset

or disabled by bridging terminals 15

and 16.

The current setting range (0.02 – 0.2 x I

)

is multiplied by 10 (0.2 – 2.0 x I

) by

bridging terminals 18 and 19.

The delay setting range (0.1 – 1.0 sec.) is

multiplied by 10 (1.0 - 10 sec.) by

bridging terminals 12 and 13.

The current setting can be calculated

according to the following example:

Overcurrent protection of a generator.

Required trip level: 110%

Generator rating: 695A

Current transformer: 800/5A

Setting: 110 x 695/800 = 96% = 0.96 x I

Troubleshooting

1) If the relay is not operating please

check that the power LED is on,

ensuring that the supply is present.

2) Measure the supply voltage which

must be compatible with the

information label on top of the

enclosure.

3) Measure the current levels in

erminals 5 and 6 and check that the

current is above setting.

For example:

0.08 x I

= 0.4A; 1 x I

= 5A

Fig. 1. Application. Earth fault detection and overcurrent detection using same transducers

1 2

Résumé du contenu

Page 1 - Troubleshooting

T2800 Overcurrent or Earth Fault Relay• Protection of generators against earth faults or overcurrent• Visual indication of power, pick-up and relay tr

Page 2 - Speciﬁcations

SpeciﬁcationsT2800 Overcurrent or Earth Fault RelayT289562EDimensions.Trip level 0.02 - 0.2 x IN or 0.2 - 2 x IN Delay 0.1 - 1.0 sec. or 1.0 - 10 se

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