Metering Function - Toshiba GRL100-701B Instruction Manual

3.5 Metering Function

The GRL100 performs continuous measurement of the analog input quantities. The
measurement data shown below is updated every second and displayed on the LCD of the relay
front panel or on the local or remote PC.
- Magnitude and phase angle of phase voltage (V a , V b , V c )
- Magnitude and phase angle of phase current at the local terminal (I a , I b , I c )
- Magnitude and phase angle of phase voltage for autoreclose (V s1 , V s2 )
- Magnitude and phase angle of symmetrical component voltage (V 1 , V 2 , V 0 )
- Magnitude and phase angle of symmetrical component current at the local terminal (I 1 , I 2 ,
I 0 )
- Magnitude and phase angle of positive sequence voltage at the remote terminal 1 and 2 (V 11 ,
V 12 )
- Magnitude and phase angle of phase current and residual current at the remote terminal 1
(I a1 , I b1 , I c1, I 01 )
- Magnitude and phase angle of phase current and residual current at the remote terminal 2
(I a2 , I b2 , I c2, I 02 )
- Magnitude of phase differential current (I da , I db , I dc )
- Magnitude of residual differential current (I d0 )
- Percentage of thermal capacity (THM%)
- Pickup current of segregated-phase current differential element (I pua , I pub , I puc )
- Restraining current of segregated-phase current differential element (I ra , I rb , I rc )
- Telecommunication delay time 1 at the remote terminal 1
- Telecommunication delay time 2 at the remote terminal 2
- Magnitude of parallel line zero sequence current (I 0m )
- Resistive and reactive component of phase impedance (R a , R b , R c , X a , X b , X c )
- Resistive and reactive component of phase-to-phase impedance (Rab, Rbc, Rca, Xab, Xbc,
Xca)
- Active power and reactive power
- Frequency
Phase angles above are expressed taking that of positive sequence voltage or positive sequence
current at the local terminal when the voltage is small or no voltage is input) as a reference phase
angle, where leading phase angles are expressed as positive, (+). When electrical quantities at the
local terminal are "0", electrical quantities at the remote terminal are displayed as " − ".
The above system quantities are displayed in values on the primary side or on the secondary side
determined by the setting. To display accurate values, it is necessary to set the CT ratio and VT
ratio as well. For the setting method, see "Setting the line parameters" in 4.2.6.7.
The signing of active and reactive power flow direction can be set positive for either power
sending or power receiving. The signing of reactive power can be also set positive for either
lagging phase or leading phase. For the setting method, see Section 4.2.6.6.
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