L2275
Emax UL
65/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
15.2.4 Inputs/outputs
15.2.4.1
Binary opto-insulated inputs
– CB-Closed:
power circuit breaker status
– K51/SZin (K51/DFin):
SdZ S input (or FW in, for SdZ Directional function)
– K51/Gzin (K51/DBin):
SdZ G input (or BW in, for SdZ Directional function)
15.2.4.2
Binary opto-insulated outputs
– K51/SZout (K51/DFout):
SdZ S output (or FW out, for SdZ Directional function)
– K51/GZout (K51/DBout):
SdZ G output (or BW out, for SdZ Directional function)
15.2.4.3
Output contacts
– K51/p1:
relay output programmable by the user
– K51/p2:
relay output programmable by the user
– K51/
µ
P:
relay output for signaling microprocessor faulty
•
Monostable contacts, only active when there is Vaux;
•
Maximum changeover current: 3A – 250V AC (0.6A – 100V DC).
•
Contact-contact insulation voltage : 1000 V AC
– K51/Y01:
relay output for signaling “trip unit tripped”
•
Bistable contact, also active in self-supply;
•
Maximum changeover current: 0.5A – 125V AC (0.3A – 110V DC).
•
Contact-contact insulation voltage : 750 V AC
15.2.5 Communication bus
Internal RS485 bus, 38,400 bps baud rate, ABB SACE protocol.
15.2.6 Protection functions
The PR113 protection unit carries out 13 independent protection functions. In particular:
1.
Protection against overload with inverse time “L”;
2.
Protection against short circuit with adjustable delay “S”;
3.
Protection against directional short circuit with adjustable delay “ D”;
4.
Protection against instantaneous short circuit “ I”;
5.
Protection against ground fault with adjustable delay “G”;
6.
Protection against phase unbalance “U”;
7.
Protection against overtemperature “OT”;
8.
Load control protection “K” (#)
9.
Protection against undervoltage “UV”;
10.
Protection against overvoltage “ OV”;
11.
Protection against residual voltage “ RV”;
12.
Protection against reverse active power “RP”.
13.
Protection with fixed threshold against instantaneous short circuit “Iinst ”;
(#) :The K protection, used for load control, is made up of two predefined curves with threshold currents and trip times lower than those selectable
with protection “L”, which can be used for two different applications:
1. disconnection of two distinct loads;
2. connection and disconnection of a load
This protection allows single loads to be disconnected before protection for overload “L” intervenes to definitively open the power circuit breaker.
It is a function which is only available when there is an auxiliary power supply.
The PR113 unit allows current signal processing of the neutral pole with different relationships relative to the value of the phase.
N.B.: Over 15.5xIn of current on the Ne, the protection itself is considered as set to 100%.
An indication (m “emergency” LED) is provided on the unit display which is activated during a protection alarm. This is de-activated when
the alarm stops or with a protection tripped. On opening of the power circuit breaker by means of the SA (see note C to par. 11.2.2), the electrical
contact of protection tripped (K51/Y01) is closed and the corresponding yellow magnetic flag turned. When there is an auxiliary power supply,
the openings page with the data of the “trip” which has just occurred is also displayed (see par. 15.2.9.2) and the “Trip” LED is lit.
The signals (K51/Y01, flag and Trip LED ) are reset by pressing the RESET key (the Trip LED is also turned off by switching the unit off).
For the protections with fixed time with adjustable delay, the relationship implemented is the following: t = k.
For the protections with inverse time, the relationship between trip time and overcurrent is given by the formula: t = k / I
2
.
Calculation of RMS and Peak
The “L, S, D, U, G and RP” protection functions carry out the relative processing on the basis of the true rms value of the secondary currents
of the CTs up to 6 In (protection G is disabled for phase currents higher than 4xIn). For currents higher than 6xIn, and for function “I”, the processing
is carried out taking into account the peak value divided by
√
2 (the sinusoidal wave form is then considered). This is because of incompatibility
between the trip time and the rms value calculation time.
If the waveform has a deformation above the declared limit (2.1@4In), the calculation tolerance of the true rms value will increase. The UV, OV,
RV voltage protections always work on the basis of the true rms value of the secondary voltages supplied by the VTs.
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