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IS220PPDAH1B 336A5026ADP14 Gas turbine module

There are two ‘Trip’ signals, one for energising the tripping relay via the tripping logic and the other for controlling LED’s and signalling contacts. Start An active "Start" O/P signals that the zero-sequence current has exceeded the pick-up setting ‘I-Setting’ . This signal is only generated providing the function is not blocked.MeasFwd ‘MeasFwd’ is active when the measuring element detects a fault in the forwards direction, i.e. the settings of ‘I dir’ and ‘U setting’ have been exceeded. MeasBwd ‘MeasBwd’ is active when the measuring element detects a fault in the backwards direction, i.e. the settings of ‘I dir’ and ‘U setting’ have been exceeded. Send The ‘Send’ O/P is the signal sent to the other end of the line. Receive Inhibit The ‘Recve Inh’ signal prevents the distance function from receiving a PLC signal (see Section 3.5.28.1.). It is only generated when the parameter ‘1 Channel’ is set, the basic time has expired or the E/F protection picks up for a reverse fault. The signal ‘Recve Inh’ must be connected to the distance function I/P ‘ExtBlkHF’.

Inverse definite minimum time overcurrent function (I0-Invers) A. Application Overcurrent function with IDMT characteristic. A typical application is as back-up for the E/F protection function, in which case it measures 3 I0 either supplied from an external source or internally derived. B. Features
Tripping characteristic according to British Standard 142 (see Fig. 3.5.29.1): c = 0.02 : normal inverse c = 1 : very inverse and long time earth fault c = 2 : extremely inverse. RXIDG : logarithmic time characteristic
DC component filter
harmonic filter
external 3 I0 signal or 3 I0 internally derived from the three phase currents
wider setting range than specified in BS 142.

Reference current ‘IB-Setting’

 An IDMT overcurrent function does not have a starting current setting in the same sense as a definite time relay. Instead the position of the characteristic is chosen to be above the load current. This is achieved by setting a reference current IB1 corresponding to the load current of the protected unit. The reference current IB determines the relative position of the characteristic. The IDMT function is enabled when the current exceeds the reference current IB by a certain amount (setting of ‘I-Start'). Setting the reference current IB to correspond to the load current IB1 of the protected unit instead of its rated current enables at IB1 < rated current : greater sensitivity IB1 > rated current : full use to be made of the thermal capability of the protected unit.Protection function enable ‘I-Start’ The IDMT function starts to run when the current applied to the function exceeds the setting ‘I-Start'. ‘I-Start’ is normally set to 1.1 IB. Choice of tripping characteristic ‘c’ The shape of the IDMT characteristic is determined by the constant ‘c’. The standard IDMT characteristics according to BS 142 are: “normal inverse” : c = 0.02 “very inverse” and “long time earth fault” : c = 1.00 “extremely inverse” : c = 2.00 “logarithmic