ABB Emax E1 Installation And Service Instructions Manual

ABB Emax E1 Installation And Service Instructions Manual Manual pdf 40 page image

L6555 Emax40/74Doc. no.Model Apparatus ScalePage No1SDH000460R0002- when the unit is off, it allows the last event recorded by the relay to be checked (when pressed for about 1 second). The functionis available for 48 hours after the relay has been switched off (absence of internal or external poser supply).- with the unit powered by PR030/B alone and with the CB off, it allows the relay to be installed in the CB (see sect. 12.6 ).- with the unit powered by PR030/B and the CB closed, it allows the LED test (when pressed for 3 seconds) and the trip coiloperating mechanism (when pressed for 7 seconds) to be tested, with consequent opening of the CB.- It allows the Trip signal to be reset (when pressed for about 1 second) after a tripping event, with the unit on.WARNING: in the case of operating temperatures between -40°C and -25°C, in versions where this is envisaged,the information only remains stored for 24 hours.12.3.5. Test connectorInstalled at the front on the relay, the connector allows PR030/B modules to be connected for temporary power supply of the relay,and BT030-USB, PR010/T, Ekip T&P for powering, communication and testing via a PC (or via the unit itself in the case of PR010/T).Consult the chapters dedicated to the accessory modules for further details.12.4. PROTECTION FUNCTIONSDepending on the model, relay PR121/P handles up to 5 independent protection functions.Current signalling from the current sensors is processed by the microprocessor of the relay which, depending on the protectionlevels and time settings, gives alarms, accomplishes timing processes and sends commands.All the adjustable protections process according to the true root mean square value of the current values read by means of thecurrent sensors.A time indication (“alarm” led) is available on the front of the unit and activates during an alarm for each protection.It deactivates when the alarm ceases or if the protection trips.WARNING: when activated, the protections must guarantee the following rule:I1(protection L)  I 2(protection S) and I2(protection S)  I3(protezione I).Incorrect protection settings lead to an error signal from the relay (inconsistent settings).The unit is equipped with a “protection-backup” function. If the first command transmitted to the trip coil fails to open the circuit-breaker immediately (TC partially faulty) further commands are transmitted to the trip coil until the circuit-breaker opens.12.4.1. Protection L- Protection L is the only adjustable protection that cannot be disabled since it is for self-protection against overloading of therelay itself.- - The type of curve setting is t=k/I2 and the tripping time is calculated according to the value of If:- - For fault currents If 12ln, the tripping time of the protection is given by the expression: t(s)= (I /I )f 1 219·t . If the calculated valueis less than 1 second, the real tripping time is forced to 1 second (t(s)= 1s.)- - For fault currents If > 12ln, the tripping time is always t(s)= 1s.NOTES:- t(s)= envisaged tripping time;- If= fault current; given in [In] (example: 0.7In)- I 1 , t1= protection L parameters set by the user, given in [In] and [s]Protection L has 3 operation conditions established by the primary current level If and by the setting of the protection itself I1:If 0.9 xI1 No alarm, all settings possible. No time setting in progress.0.9 xI 1 < If < (1.05...1.2)xI1Prealarm L signal, all settings possible. No opening time setting in progress.(1.05...1.2) xI1 < I f Alarm L signal, no setting possible. Opening time setting in progress.WARNING: the protection L threshold range ensures that:- the relay does not set to the alarm status for current values of less than 1.05 xI1 ;- the relay will set to the alarm status for current values exceeding 1.2 xI1.12.4.1.1. Thermal memory LThe thermal memory function can be enabled to protect the cables. It is based on the “L” parameter defined as trip time of thecurve (t1) selected @1.25xI1. This function can be enabled through PR010/T, or Ekip Connect.The trip time of the release surely is 100% of the time selected after a L time has elapsed from the last overload or last trip, orelse trip time will be reduced depending on the overload and time elapsed.IPR121/P is equipped with two instruments to make up this thermal memory. The first one is only effective when the release ispowered (it also records overloads that have not lasted long enough to trip the release); the second operates even when the releaseis not powered, reducing any trip times when it closes again straight after and is enabled as soon as the circuit-breaker is tripped.The PR121/P release determines which one to use according to the situation.12.4.2. Protection SThe protection, which can be disabled, can be the fixed time (t=k) or inverse time (t=k/I2 ) type.The tripping time with inverse time curve is given by the expression: t(s)=(I )f 22100 t . If the calculated value is less than t2, the