5.13
Date Code 20170814
Instruction Manual
SEL-700G Relay
Metering and Monitoring
Metering
Differential Metering
The differential metering function in the SEL-700G1 model reports the
fundamental frequency operate and restraint currents for each differential element
(87) in multiples of TAP. Table 5.8 shows the value reported. Figure 5.14 shows an
example of the METER DIF (differential) command report.
Harmonic Metering
The harmonic metering function in the SEL-700G1 reports the current
harmonics through the fifth harmonic and the total harmonic distortion
percentage (THD %). Table 5.9 shows the harmonic values reported. This
command is only available in the SEL-700G1 model with the differential
element. Figure 5.15 provides an example of the METER H (Harmonic)
command report.
Table 5.8
Measured Differential Meter
Relay Option
Differential Values
SEL-700G1
Operate currents IOP1, IOP2, IOP3 in pu of TAP value for
elements 87-1, 87-2, and 87-3, respectively
Restraint currents IRT1, IRT2, IRT3 in pu of TAP value for
elements 87-1, 87-2, and 87-3, respectively
IOP1F2, IOP2F2, and IOP3F2 are 2nd harmonic currents as a
percentage of IOP1, IOP2, and IOP3, respectively.
IOP1F4, IOP2F4, IOP3F4 are 4th harmonic currents as a
percentage of IOP1, IOP2, and IOP3, respectively.
IOP1F5, IOP2F5, and IOP3F5 are 5th harmonic currents as a
percentage of IOP1, IOP2, and IOP3, respectively.
=>>
MET DIF <Enter>
SEL-700G Date: 02/24/2010 Time: 15:49:20.763
GENERATOR RELAY Time Source: Internal
IOP1 IOP2 IOP3
Operate (pu) 0.01 0.01 0.02
IRT1 IRT2 IRT3
Restraint (pu) 2.01 2.01 1.99
IOP1F2 IOP2F2 IOP3F2
2nd Harmonic (%) 0.00 0.00 0.00
IOP1F4 IOP2F4 IOP3F4
4th Harmonic (%) 0.00 0.00 0.00
IOP1F5 IOP2F5 IOP3F5
5th Harmonic (%) 0.00 0.00 0.00
=>>
Figure 5.14
METER DIF (Differential) Command Report
Table 5.9
Measured Harmonic Meter Values
Relay Option
Harmonic Values
SEL-700G1 only
Fundamental and 2nd, 3rd, 4th, 5th harmonic values
magnitude (secondary A) and THD % of line currents IAX,
IBX, ICX, IAY, IBY, and ICY
Содержание SEL-700G Series
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