6–20
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 6: ACTUAL VALUES
FIGURE 6–5: Open Delta VT Connection
The following phasor diagram presents, in graphic form, the relationship between system
quantities and how they are measured, calculated, and displayed. Note that all angles
shown are negative or lagging angles.
FIGURE 6–6: Typical Phasor Diagram for Open Delta Connection
For example, assume a balanced three phase system with a VT Turn Ratio of 35:1, VT
ratings 4200/120 V, and motor running at full load with a power factor of 0.95 (18.2° angle).
When the measured phase to phase voltage is 115 V, the following quantities are displayed
by the relay and EnerVista 469 Setup software:
In the
A2 METERING DATA
VOLTAGE METERING
menu:
VAB
: “4025 Volts”
VBC
: “4025 Volts”
VCA
: “4025 Volts”
AVERAGE LINE VOLTAGE
: “4025 Volts”
SYSTEM FREQUENCY
: “60.00 Hz”
In the
A2 METERING DATA
PHASORS
menu:
VA PHASOR
: “95.8% at 0° Lag”
VB PHASOR
: “0.0% at 48° Lag”
VC PHASOR
: “95.8% at 300° Lag”
IA PHASOR
: “100.0% at 48° Lag”
IB PHASOR
: “100.0% at 168° Lag”
IC PHASOR
: “100.0% at 288° Lag”
806560A1.CDR
806556A1.CDR
Vca
V
A =
Vab
Vbc
V
C = –
Vbc
Vac
Phase
R
otat
i
on
System Voltages:
Vab
Vbc
Vca
Measured Voltages:
Vab
=
V
A
(G
2 –
G
1
)
–
Vbc
=
V
C
(
H2 –
G
1
)
Calculated Voltage:
Vac
=
Vab
+
Vbc
Displayed Voltages:
Va
=
Vab
Vb
= 0°
Vc
= –
Vbc
Содержание Masoneilan 469 Series
Страница 4: ......
Страница 91: ...CHAPTER 3 INSTALLATION 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 3 27 3 2 14 2 Speed Motor Wiring ...
Страница 92: ...3 28 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 3 INSTALLATION ...
Страница 256: ...5 112 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 5 SETTINGS ...
Страница 298: ...6 42 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 6 ACTUAL VALUES ...
Страница 300: ...7 2 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 7 TESTING FIGURE 7 1 Secondary Injection Test Setup ...
Страница 319: ...CHAPTER 8 APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 8 7 HGF5C 808841A1 HGF8 808842A1 ...
Страница 321: ...CHAPTER 8 APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 8 9 808712A1 CDR ...
Страница 330: ...8 18 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 8 APPENDIX ...