ADVANCED OPERATION - Section 5
5-18 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
Turn the [MODIFY] knob to the circuit breaker advance time setting, and the
Φ
=xxx.x will indicate the
phase angle at time of breaker closure. Or turn the [MODIFY] knob until 00.0
°
is displayed, and the
required breaker advance time is shown.
The
Φ
=xxx.x or breaker phase is computed from the following formula:
Φ
breaker
=
F
gen
-
bus
+ 360(f
gen
- f
bus
)t
b
(or, in terms of the Va & Vc outputs,
Φ
breaker
=
Φ
a-c + 360 (fa-fc)t
b
)
where:
Φ
breaker
= phase angle at the time of breaker closure
Φ
gen
-
bus
= phase of the generator voltage referred to the bus voltage
t
b
= circuit breaker advance time
f
bus
= bus frequency (MTS-1710 prefault frequency setting)
f
gen
= generator frequency (MTS-1710 fault frequency)
The total error in this value is given by: ±360
∆
f ± 0.5°
f
Typical values at 60Hz: ±0.8
°
for
∆
f =.05
Hz
±1.1
°
for
∆
f = 0.1
Hz
5.6 PHASE SEQUENCE
The voltage output phase sequence can be programmed via the menu under SETTINGS MODES PHASE
PHS-SEQ.
The following choices are provided:
PHASE SEQUENCE
+ve
Selects positive phase sequence (abc). This is the default setting.
-ve
Selects negative phase sequence (acb)
In I3-WYE current mode, this feature also controls the phase sequence of the 3
Φ
current output.
5.7 DYNAMIC MEASUREMENT MODE
The dynamic measurement mode controls high speed measurement of voltage and current in FAULT state.
This is provided in the menu under SETTINGS MODES MEAS.
The following choices are provided:
DYNAMIC MEAS MODE
AUTO
Use high-speed peak responding measurement for first 240ms in FAULT state, and
RMS measurement at all other times. (This is the default setting).
RMS
Forces true RMS responding measurement all of the time.
PEAK
Use RMS measurement in PREFAULT state, and high-speed peak responding
measurement in FAULT state.
