5.3
Date Code 20170814
Instruction Manual
SEL-700G Relay
Metering and Monitoring
Metering
➤
Demand and peak demand metering
➤
Synchrophasor metering
➤
Differential metering
➤
Harmonic metering (differential)
Fundamental
Metering
details each of the fundamental meter data types in the SEL-700G.
Section 8: Front-Panel Operations and Section 7: Communications describe
how to access the various types of meter data by using the relay front panel
and communications ports.
NOTE:
Phase-to-phase voltages for wye-
connected PTs are available in Appendix K:
Analog Quantities and can be displayed on
the front panel.
NOTE:
If the winding phase CTs are delta
connected, the primary currents displayed
are derived from the secondary values by
multiplying them with CTR (CT ratio) and
dividing them by the square root of 3. The
phase angles shown are the same as the
secondary values. If the CT connection
type is known (DAB or DAC), the phase
angles could be corrected by the user.
The MET response is meant to show
steady-state primary values. During
unbalanced conditions it is not possible to
reproduce the primary line currents
accurately because the delta-connected
CTs filter out the zero-sequence
component of the line current.
Wye connected CTs do not have any such
issue.
Table 5.1
Measured Fundamental Meter Values
(Sheet 1 of 2)
Relay Option
Fundamental Meter Values
X-Side Quantities
(model dependent)
➤
Input currents IAX, IBX, and ICX magnitudes (A primary) and phase angles (degrees)
➤
Calculated currents IGX (IGX = 3I0 = IAX + IBX + ICX), positive-sequence current I1X, and nega-
tive-sequence current 3I2X magnitudes (A primary) and phase angles (degrees)
➤
Wye-connected input voltages (with respect to neutral):
➢
VAX, VBX, and VCX magnitudes (V primary) and phase angles (degrees)
➢
Calculated voltages VGX (VGX = 3V0 = VAX + VBX + VCX), positive-sequence voltage V1X
and negative-sequence voltage 3V2X magnitudes (V primary) and phase angles (degrees)
➤
Delta-connected input voltages:
➢
VABX, VBCX, and VCAX magnitudes (V primary) and phase angles (degrees)
➢
Calculated positive-sequence voltage V1X and negative-sequence voltage 3V2X magnitudes (V
primary) and phase angles (degrees)
➤
Power and Power Factor (single phase quantities for wye-connected PTs only):
➢
Single-phase (PAX, PBX, PCX) and three-phase (P3X) real power (kW)
➢
Single-phase (QAX, QBX, QCX) and three-phase (Q3X) reactive power (kVAR)
➢
Single-phase (SAX, SBX, SCX) and three-phase (S3X) apparent power (kVA)
➢
Single-phase (PFAX, PFBX, PFCX) and three-phase (PF3X) power factor (lead/lag)
➤
Frequency (FREQX) in Hz.
➤
Volts/Hertz in %.
Y-Side Quantities
(model dependent)
Input currents IAY, IBY, and ICY magnitudes (A primary) and phase angles (degrees)
Calculated currents IGY (IGY = 3I0 = IAY + IBY + ICY), positive-sequence current I1Y, and negative-
sequence current 3I2Y magnitudes (A primary) and phase angles (degrees)
Wye-connected input voltages (with respect to neutral):
➢
VAY, VBY, and VCY magnitudes (V primary) and phase angles (degrees)
➢
Calculated voltages VGY (VGY = 3V0 = VAY + VBY + VCY), positive-sequence voltage V1Y
and negative-sequence voltage 3V2Y magnitudes (V primary) and phase angles (degrees)
➤
Delta-connected input voltages:
➢
VABY, VBCY, and VCAY magnitudes (V primary) and phase angles (degrees)
➢
Calculated positive-sequence voltage V1Y and negative-sequence voltage 3V2Y magnitudes
(V primary) and phase angles (degrees)
Содержание SEL-700G Series
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