ABB Relion 670 Series Applications Manual page 425
Bay control, version 2.1 ansi
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Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
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1MRK 511 358-UUS A
16.1.3
Zero clamping
The measuring functions, CVMMXN, CMMXU, VMMXU and VNMMXU have no interconnections
regarding any setting or parameter.
Zero clampings are also entirely handled by the
each of the functions. For example, the zero clamping of
zero clamping of I1 is handled by
Example how CVMMXN is operating:
The following outputs can be observed on the local HMI under Monitoring/Servicevalues/SRV1
S
P
Q
PF
ILAG
ILEAD
U
I
F
The settings for this function is found under Setting/General setting/Monitoring/Service
values/SRV1
It can be seen that:
•
When system voltage falls below
and F on the local HMI is forced to zero
•
When system current falls below
and F on the local HMI is forced to zero
•
When the value of a single signal falls below the set dead band for that specific signal, the
value shown on the local HMI is forced to zero. For example, if apparent three-phase power
falls below
16.1.4
Setting guidelines
The available setting parameters of the measurement function CVMMXN, CMMXU, VMMXU,
CMSQI, VMSQI, VNMMXU are depending on the actual hardware (TRM) and the logic configuration
made in PCM600.
The parameters for the Measurement functions CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,
VNMMXU are set via the local HMI or PCM600.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
Operation : Disabled / Enabled . Every function instance (CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,
VNMMXU) can be taken in operation (
Application manual
IL1ZeroDb in CMMXU ETC.
Apparent three-phase power
Active three-phase power
Reactive three-phase power
Power factor
I lagging U
I leading U
System mean voltage, calculated according to selected mode
System mean current, calculated according to selected mode
Frequency
UGenZeroDB , the shown value for S, P, Q, PF, ILAG, ILEAD, U
IGenZeroDB , the shown value for S, P, Q, PF, ILAG, ILEAD, U
SZeroDb the value for S on the local HMI is forced to zero.
Enabled ) or out of operation ( Disabled ).
ZeroDb for each and every signal separately for
U12 is handled by UL12ZeroDb in VMMXU,
Section 16
Monitoring
GUID-8DABC3F5-6615-493C-B839-A5C557A2FAE8 v2
SEMOD54481-165 v12
419
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