Modular units

PE57172
PE88012
PE88011
PE88010
MT11325
Generalities LPCT protection chain
TLP130, CLP2 sensors and
Sepam series 20, series 40, series 80
protection units
Standard
applications
Sepam series 20
Demanding
applications
Sepam series 40
Custom
applications
Sepam series 80
AMTED398078EN.indd
DE58405EN
LPCT sensors are voltage-output current sensors (Low Power Current
Transformer) compliant with the IEC 60044-8 standard.
These sensors are designed to measure rated current between 5 A and 630 A,
with a ratio of 100 A / 22.5 mV.
Sepam series 20, series 40, series 80 protection units are at the heart
of the LPCT protection chain.
Sepam series 20, series 40, series 80 performs the following functions:
b acquisition of phase currents measured by the LPCT sensors
b utilization of measurements by the protection functions
b tripping of the breaking device in case of fault detection.
Advantages
b Consistent protection chain with the same sensor measures phase currents
from 5 A to 630 A
b Simple to install and implement:
v installation of LPCT sensors
- TLP130, TLP160 and TLP190 are installed around MV cable
- CLP2 is installed on the MV circuit
v LPCT connected directly to Sepam series 20, series 40, series 80
v accessories available to test the LPCT protection chain by secondary current
injection.
b LPCTs range of use
LPCT measuring and protection function guaranteeing the accuracy up to
the short-time current.
Following the range of use of LPCT:
v from 5 A up to 1250 A respecting the error limits imposed by the accuracy class 0,5
v from 1250 A up to 50 kA respecting the error limits imposed by the accuracy class 5P.
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
Ratio error
Protective class 5P
Measuring class 0.5
5 20 100 1000 1250 2000 3000 31500 40000 50000
b Optimized integration of functions:
v measurement of phase rated currents as of 25 A that is set by micro-switch
v monitoring of LPCT sensor by Sepam series 20, series 40, series 80 (detection of
phase loss).
Connections
1 LPCT sensor, equipped with a shielded cable fi tted with an RJ45 connector
to be connected directly to the card 3
2 Sepam series 20, series 40, series 80 protection unit
3 Card interface that adapts the voltage delivered by the LPCT sensors,
with microswitch setting of rated current.
v CCA671 card for series 80
v CCA670 card for series 20 and 40.
Testing and injection
4 CCA613 remote test plug, fl ush-mounted in front panel of cubicle, equipped
with a 3-m cord to be connected to the CCA670 connector test socket (9-pin Sub D)
5 ACE917 injection interface, used to test the LPCT protection chain with
a standard injection box
6 Standard 1A injection box.
A
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