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The minus sign ('-') front the threshold and power indicates reverse power.. fact, the case where the circuit-breaker open
and current detected, the timing leads the "alarm" state and not "TRIP".2).4 Protection "
The disable-type, fixed-time protection trips when for time higher than equal time set unbalance between two more line voltages
greater than I6, detected.
Thresholds LC1 and LC2 are expressed percentage I1(current threshold specified for protection while the "warning current" Iwis expressed
as absolute value.
13.2.2.
The current thresholds are lower than those available with the protection that the load control can used prevent tripping due overloads. therefore defined the following formula. When the circuit-breaker closed the passage current detected, you pass immediately from the state
of "alarm" "TRIP" without timing (see par.2.
13.1 Protection "UV"
When the minimum phase voltage drops below the set threshold U8the protection counts down the preset time interval and then opens.
13.9. ax. 15.9.9.9 Voltage protections "UV", "OV", "RV", "U" (PROTECTIONS AVAILABLE ONLY WITH THE ADDITIONAL PR120/V MODULE)
The PR122/P unit provides voltage protections, which can disabled, with fixed adjustable time k), active both with self-supply and with
auxiliary supply:
- Undervoltage "UV"
- Overvoltage "OV"
- Residual voltage "RV"
- Line voltage unbalance "U". 13. 3-pole CBs, presence
of neutral voltage must set the "neutral voltage present" parameter.9. tio fro 1(V12,V23,V31)
Unbalance percentage calculated follows lta ----------------------------------------------- 1----—— 23— .10 Reverse active power protection "RP"(AVAILABLE ONLY WITH THE ADDITIONAL PR120/V MODULE)
The PR122/P unit provides protection (which can disabled) with adjustable fixed time k), against reverse active power, active both with
self-supply and auxiliary supply.9.2.
When the total reverse active power (sum the power the phases) exceeds the set reverse active power threshold P11, the protection counts
down the preset time interval t11 and then opens.Load tro tio n
Single loads can enabled/disabled the load side before the overload protection intervenes and trips the circuit-breaker the supply
side.9.
13.2.2. This because the fault linked the voltages can persist even
with the circuit-breaker open.3. The allowable values are given the following table:
Warning current 0.
The residual voltage calculated vectorially summing the phase voltages.9.
13.1.
13.9.4)
The operating logic involves the activation three contacts when the preset thresholds LC1, LC2 and are exceeded.9.9.9.0 step 0.3 Protection "RV"
When the residual voltage exceeds the set threshold U10the protection counts down the preset time interval t10 and then opens. This done contactors switch-disconnectors (wired outside the release), controlled the PR122/P means contacts the PR120/
K module the PR021/K external unit.2.2 Protection "OV"
When the maximum phase voltage exceeds the set threshold the protection counts down the preset time interval and then opens.30 -h10.The threshold indicated asa percentage "Pn", where "Pn"
is the rated power the circuit-breaker Vn*In).
U U+U+U
This protection available 4-pole 3-pole CBs with neutral voltage available (as per circuit diagram page 153).
.
m (V12,V23,V31)
13.
48/158
.05xIn
Threshold LC1________________50% -h100% step xI1
Threshold LC2_______________ 50% -h100% step xI1
From the PR122/P you can associate each the PR120/K PR121/K contacts with configuration (NO NC), delay and the eventual latch.. Range: .
Apart from normal timing and "Trip" operation, the voltage protections can state defined "alarm" (with the "emergency" led and an
alarm message displayed) providing there auxiliary PR120/V module power supply.
Model L2234 Apparatus Scale
L 2778
Doc No- 2
Page No. 90% steps.
The function active when auxiliary power supply present, supply from PR120/V (see par.11 Frequency protections "UF", "OF"(AVAILABLE ONLY WITH THE ADDITIONAL PR120/V MODULE)
The frequency protections record the mains frequency variations above adjustable threshold (f12, t12) below (f13, t13), generating alarm
or the opening the circuit-breaker.
