B0431
Emax X1-Tmax T7-Tmax T8
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Apparatus
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3.3.1. Protections
Depending on the version, the adjustable protections available are:
Symbol
Protection against
L
overload with inverse long time delay
S
short-circuit with adjustable delay
I
instantaneous short-circuit
G
earth fault with adjustable delay
U
phase unbalance
OT
temperature off range
MCR
closing on short-circuit
MM
Instantaneous short-circuit (maintenance mode)
Rc
Residual current
NOTE: protection MCR is available with SACE Emax X1 circuit-breakers. Release PR332/P MM has MM protection but not Rc
protection.
PR333/P includes 2 further basic protections:
Symbol
Protection against
S2
short-circuit with adjustable delay
D
directional short-circuit with adjustable delay
Presence of the PR330/V module allows further protections to be controlled for both protection releases:
Symbol
Protection against
UV
undervoltage
OV
overvoltage
RV
residual voltage
RP
reverse active power
UF
underfrequency
OF
overfrequency
U
phase-to-phase voltage unbalance (as an alternative to phase currents)
In addition, PR332/P and PR333/P provide fixed protection against instantaneous short-circuits at high currents, known as Iinst.
3.3.2. Functions
PR332/P and PR333/P include various different functions, depending on the version and configuration chosen:
- Runtime measurement of the main electrical quantities available: phase current, peak factor, mains frequency, phase-to-phase
voltages, power, energy, power factor, harmonic distortion;
- Programmable measurements: periodic storage of maximum and minimum signals, waveforms and datalogger;
- Autotest: continuous monitoring of the main connections to the release, among which: current sensors, trip coil, rating plug,
circuit-breaker state.
- Maintenance information and counters: number of operations, estimated contact wear, events log.
3.3.3. Inputs/Outputs
Depending on the versions, PR332/P and PR333/P are equipped with:
- K51/, 5 contacts (2 inputs, 2 outputs and one common contact) for the S, G and D selectivity functions.
- S51/P1, output contact of the Open/Close type configurable by the customer, for monitoring one or more state or alarm events.
The exception is PR332/P MM, which replaces S51/P1 and K51/ with other contacts for the MM function:
- K14/K15, input contact for activating protection MM.
- 95S/98S: output contact which supplies the state of protection MM.
Consult chapter 3.8.4 Zone selectivity, 3.8.5 S51/P1 and 3.8.6 Function MM for further details.
B1751
