ADVANCED OPERATION - Section 5
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 5-17
CU A002 15A
MANTA TEST SYSTEMS
5.5 SYNCHRONIZING MODE
Synchronizing mode is intended for testing of synchrocheck relays, reclosing relays, generator controls, and
other similar devices which require two independent frequency sources.
5.5.1 Operation
Synchronizing mode can be enabled/disabled via the menu under SETTINGS MODES FREQ
SYNCHRONIZING.
When enabled, select variable frequency mode, and set a fault frequency different from the prefault
frequency value. In the fault state, VC will run at the prefault frequency while all other outputs will run at
the fault frequency. The slip frequency is the difference between the prefault and fault frequency settings.
The standard connections, when using this mode, is shown in Figure 3.15.
5.5.2 Phase Measurement in Synchronizing Mode
When the synchronizing mode is enabled, high speed measurement of phase between two voltages is
performed (similar to the synchrocheck option on MTS-1030 Multifunction Powermeter).
To use this, turn synchronizing mode on, and select
Φ
-N C-N fault mode. In the FAULT state, VCN will
run at fault frequency.
Press [PHASE] and note that high speed phase measurement occurs. Note that the units annunciator will
read “DegVa-c”.
In the other
Φ
-N fault modes, the annunciator will read “DegVa-b” and “DegVa-a”. If the fault mode is
Φ
-
Φ
, 2-
Φ
-N, or 3-
Φ
, the phase measurement is meaningless.
In synchronizing mode, an additional feature to note is, if you operate in dynamic mode and set
POSTFAULT on, when the stop trigger occurs, the phase reading will freeze, and the phase angle between
the two voltages should also freeze at this value, allowing verification with an external phase angle meter.
After the relay has operated, the MTS-1710 enters the postfault state and freezes the phase reading. The
circuit breaker advance time, and phase angle at time of breaker closure, can be seen by selecting
SETTINGS MODES FREQ BRKR-ADV in the menu.
5.5.3 Measurement of Circuit Breaker Advance Time
To perform this test, the MTS-1710’s Vc output is connected to the relay bus voltage input, and the MTS-
1710’s VA output is connected to the relay generator voltage input, as in Figure 3.15.
After the relay has operated, the MTS-1710 enters the postfault state and freezes the phase reading. The
circuit breaker advance time, and phase angle at time of breaker closure, can be seen by selecting
SETTINGS MODES FREQ BRKR-ADV in the menu.
BREAKER ADVANCE
TIME:103ms
Φ
=+15.4°
