ADVANCED OPERATION - Section 5
5-46 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
The PERMISSIVE selection sets the [AUX CONTACT_1] output open in the prefault and postfault states,
and closes approximately 30ms after entering the fault state (permissive to allow accelerated trip). The
UNBLOCK selection sets the [AUX CONTACT_1] output closed in the prefault and postfault states, and
opens approximately 30 ms after entering the fault state (removal of blocking to allow accelerated trip).
The figure below shows typical connections required when using the MTS-1710’s DC voltage option.
FIGURE 5.21 PERMISSIVE & UNBLOCK SIGNAL SIMULATOR USING AUX CONTACTS
5.15.4 Auxiliary Contact Delay
The delay time for simulating the permissive/unblock signal, using the auxiliary contacts, is programmable
via the SETTINGS MODES AUX-CONTCT AUX_CONTACT_1 DELAY selection in the front panel
menu. The default setting is 32 ms.
5.16 PHASE REVERSAL FUNCTION
The present phase angle setting (angle between the voltage and the current) can be reversed by 180° in one
step by using the EXEC REV-
Φ
selection in the front panel menu. This is useful for switching from a
forward direction fault to a reverse direction fault when testing for a directional, reverse power or distance
relay.
Relay under test
Permissive or Unblock
input
PREFAULT
FAULT
POSTFAULT
Permissive
Unblock
delay