1MAC050144-MB C
Section 7
Control functions
615 series ANSI
519
Technical Manual
In case
Syncro check mode
is set to "Asynchronous", the additional conditions must be
fulfilled
• The measured difference of the voltages is less than the set value of
Difference
voltage.
• The measured difference of the phase angles is less than the set value of
Difference
angle.
• The measured difference in frequency is less than the set value of
Frequency
difference.
• The estimated breaker closing angle is decided to be less than the set value of
Difference angle.
Figure 282:
Conditions to be fulfilled when detecting synchronism between systems
When the frequency, phase angle and voltage conditions are fulfilled, the duration of the
synchronism conditions is checked so as to ensure that they are still met when the
condition is determined on the basis of the measured frequency and phase difference.
Depending on the circuit breaker and the closing system, the delay from the moment the
closing signal is given until the circuit breaker finally closes is about 50 - 250 ms. The
selected
Closing time
of CB informs the function how long, the conditions have to persist.
The synchrocheck function compensates for the measured slip frequency and the circuit
breaker closing delay. The phase angle advance is calculated continuously with the
formula:
The closing angle is the estimated angle difference after the breaker closing delay.
φ
V_BUS
Measured bus voltage phase angle
φ
V_LINE
Measured line voltage phase angle
f
V_BUS
Measured bus frequency
f
V_LINE
Measured line frequency
T
CB
Total circuit breaker closing delay, including the delay of the relay
output contacts defined with the Closing time of CB setting
parameter value
Dead line or bus value
Live line or bus value
Difference angle
V_Bus
V_Line
Difference voltage
f
V_Bus
f
V_Line
Frequency [Hz]
'
f
=
_
f
V_Bus
-
f
V_Line
_
Rated frequency
Frequency deviation
'M
=
_
M
V_Bus
-
M
V_Line
_
Difference frequency
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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