Page 3 - Tmax XT White Paper Smart Grid

Utility
GD
MV/LV
Tmax XT
Transformer
PV
Energy
Plant
Set
System
G
Emax 2
–
–
IPS + ID
–
–
Loads Ekip UP Storage Plant Wind Gen
Tmax XT or Emax 2 as local generation Utility
circuit breaker
In such scenario, there are loads not GD
working in islanding condition.
Tmax XT or Emax 2, installed on the
generator feeder, performs the triple MV/LV
function of Interface Protection Transformer
System, Interface Device and
Generator Device.
V
t Tmax XT
t
U9
f12
t8 t9
V
t12 Emax 2
t12
f
t GenD + IPS + ID
t
f12
Ekip UP
f13
Loads t12 –
t12
t13 f
f
t PV
Plant
V
f13 mean
t 2
U14
t V23 V12
t13
U9 f
α
α
U1 U2 f12 U3
3 V31 t8 t9 1
t12 mean V
t12
V1 f
t U14
Functions available Q t
U1 U2 f12 U3
V V3 f13 V2 P • Maximum positive-sequence voltage
t Voltage protections (ANSI 59 V0) - Function trips when the
t12
• Overvoltage (ANSI 59) with double t12 TRIP
V1
t t13 f positive-sequence voltage exceeds
U9 threshold S1, S2 - Function trips f
V when the phase voltage exceeds the t the set threshold.
t f12 t8 t9 set thresholds.
t t12 V • Undervoltage (ANSI 27) with double f(Hz) frequency V2 ROCOF (ANSI 81R)
V3
f13 mean
t12
U9
f V threshold S1, S2 - Function trips failure 2 after failure U14 • Function trips when the rate of
t13
t t f12 V23 V12 change of frequency exceeds the set
t t8 t9 V when the phase voltage falls below 50/60Hz α α f threshold.
t
t12 U9 f12 the set thresholds. U1 U2 frequency
t12
U3
after failure
f13 f 3 V31 1
t t12 f12 Time
mean
t12
t8 t9
t t13 f V Frequency protections V1
t12
t12 f12 f • Overfrequency (ANSI 81H) with U14
t f13 f double threshold S1, S2 - Function Q
t t12 trips when the frequency exceeds the RQ (ANSI 40/32R)
t12
t f13 mean f U1 U2 U3 V2 P • Function trips when the reverse
t13
V3
2 f12 f set thresholds. reactive power exceeds the set
V1
t V23 f13 V12 U14 • Underfrequency (ANSI 81L) with TRIP threshold.
t13
t12 f double threshold S1, S2 - Function
t12
α
α f13 mean f
t13
U1 U2 U3 trips when the frequency falls below
2
3 V31 1 f
t V23 V12 mean the set thresholds. V3 V2
U14
t13
after failure
α V1 f f(Hz) frequency
α f13 mean Voltage restrained failure
U14
U1 U2 2 U3
1
Q 3 V31 U14 • Maximum zero-sequence voltage 50/60Hz
t13
V23 V12 mean
U1 U2 U3 f (ANSI 59 V0) - Function is tripped frequency
after failure
V1
V3 α α V2 P when the zero-sequence voltage
U14
U1 U2 U3 Time
3 V31 1 exceeds the set threshold.
TRIP
Q V1
mean • Maximum negative-sequence voltage
U1 U2 U3
V1
V3 V2 P (ANSI 59 V0) - Function trips when
U14
TRIP
Q V1 the negative-sequence voltage
V3
V2
f(Hz) frequency exceeds the set threshold.
U1 U2 after failure
U3
V3 failure V2 P
TRIP
50/60Hz V1
V3
f(Hz) frequency V2
frequency
after failure
after failure
failure Time
50/60Hz
V3
f(Hz) frequency V2
frequency
after failure
after failure
failure Time
50/60Hz
frequency
after failure
Time