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37
37
Section 7. Protection
Section 7. Protection
2.
2. Enable o
Enable or di
r disable
sable for TRIP
for TRIP or
or OPEN
OPEN to
to enable
enable
or disable the protection action selected in
or disable the protection action selected in
setting 1 for each pick or delay combination.
setting 1 for each pick or delay combination.
3.
3. Pickup
Pickup 1
1 for TRIP
for TRIP or
or OPEN
OPEN sets
sets the thr
the threshold
eshold
for the first target circuit breakers.
for the first target circuit breakers.
4.
4. Delay
Delay 1 for
1 for TRIP or
TRIP or OPEN
OPEN sets
sets the time
the time delay
delay
for the first target circuit breakers.
for the first target circuit breakers.
5.
5. Pickup
Pickup 2
2 for TRIP
for TRIP or
or OPEN
OPEN sets
sets the thr
the threshold
eshold
for the second target circuit breakers.
for the second target circuit breakers.
6.
6. Delay
Delay 2 for
2 for TRIP or
TRIP or OPEN
OPEN sets
sets the time
the time delay
delay
for the second target circuit breakers.
for the second target circuit breakers.
7.
7. Backup
Backup function
function enabled
enabled or
or disabled
disabled for
for TRIP
TRIP
or OPEN for the second group of target circuit
or OPEN for the second group of target circuit
breakers for backup of the first group.
breakers for backup of the first group.
8.
8. Backup
Backup time
time delta
delta enabled
enabled or
or disabled
disabled for
for TRIP
TRIP
or OPEN for an additional time delay before the
or OPEN for an additional time delay before the
backup group of circuit breakers is operated if
backup group of circuit breakers is operated if
the fault current continues.
the fault current continues.
9.
9. Enable
Enable or di
or disable
sable for al
for alarm onl
arm only is
y is a gl
a global
obal
command to enable or disable alarm settings.
command to enable or disable alarm settings.
10.
10. Pick
Pickup 1 f
up 1 for al
or alarm o
arm only.
nly.
11.
11. Delay
Delay 1 fo
1 for al
r alarm o
arm only.
nly.
12.
12. Pick
Pickup 2 f
up 2 for al
or alarm o
arm only.
nly.
13.
13. Delay
Delay 2 fo
2 for al
r alarm o
arm only.
nly.
The available
The available delay settings are
delay settings are the same as
the same as for the
for the
short-time and ground-fault bands. The minimum
short-time and ground-fault bands. The minimum
current pickup setting is 20% of the largest sensors
current pickup setting is 20% of the largest sensors
in the zone and the highest setting is 22,000 amperes.
in the zone and the highest setting is 22,000 amperes.
Calculations for the 87B algorithm
Calculations for the 87B algorithm
The Entellisys calculation algorithms operate on the
The Entellisys calculation algorithms operate on the
raw digitized data obtained from the current sensors.
raw digitized data obtained from the current sensors.
Because of this, the mathematical operations are
Because of this, the mathematical operations are
performed on a single sample of data from each
performed on a single sample of data from each
current used in the calculation. Since the current
current used in the calculation. Since the current
data across
data across the system
the system are
are 100% synchronized,
100% synchronized,
the calculations need not take into account the
the calculations need not take into account the
phase angle between voltage and current, and
phase angle between voltage and current, and
may be, strictly based, on the instantaneous
may be, strictly based, on the instantaneous
current magnitudes.
current magnitudes.
During each half-power cycle the CPU calculates
During each half-power cycle the CPU calculates
the mean-squared residual current for each phase
the mean-squared residual current for each phase
of the M circuit breakers in the zone. An example
of the M circuit breakers in the zone. An example
of the formula for phase A is:
of the formula for phase A is:
ΙΙ
2
2
residual,A
residual,A
=
=
2
2
Σ
Σ ((
ii
A,0,k
A,0,k
±
± ii
A,1,k
A,1,k
±…±i
±…±i
A,M-1,k
A,M-1,k
))
2
2
where
where
ΙΙ
residual,A
residual,A
is the residual current for phase A,
is the residual current for phase A,
N
N
is the number of samples per half-cycle (64),
is the number of samples per half-cycle (64),
M
M
is
is
the number of circuit breakers in the zone carrying
the number of circuit breakers in the zone carrying
current in or out, and i
current in or out, and i
A,0,k
A,0,k
…i
…i
A,M-1,k
A,M-1,k
are the
are the
kk
th samples
th samples
of phase A circuit breakers 0 through
of phase A circuit breakers 0 through
M
M
–1. The
–1. The
same calculation is performed by the CPU for all
same calculation is performed by the CPU for all
three phases simultaneously and adjustments for
three phases simultaneously and adjustments for
CT errors are performed for each phase and CT.
CT errors are performed for each phase and CT.
The total residual current for the three-phase system
The total residual current for the three-phase system
is calculated by selecting the maximum single-phase
is calculated by selecting the maximum single-phase
residual of the three residual currents. The subscript
residual of the three residual currents. The subscript
adjusted
adjusted
indicates that the residual currents have
indicates that the residual currents have
been adjusted for CT error:
been adjusted for CT error:
ΙΙ
2
2
BD
BD
=
= m
ma
axx
((
ΙΙ
2
2
residual,A,adjusted,
residual,A,adjusted,
ΙΙ
2
2
residual,B,adjusted,
residual,B,adjusted,
ΙΙ
2
2
residual,C,adjusted
residual,C,adjusted
))
If the thresholds for time and magnitude are
If the thresholds for time and magnitude are
exceeded, a command to sound alarm 1, sound
exceeded, a command to sound alarm 1, sound
alarm
alarm 2 if it
2 if it is set,
is set, trip th
trip the prima
e primary
ry targe
targets, and
ts, and
eventually trip the secondary targets is issued by
eventually trip the secondary targets is issued by
the CPU,
the CPU, as reques
as requested by the user settings
ted by the user settings..
Each residual current is provided with a cooling
Each residual current is provided with a cooling
algorithm to allow for the thermal characteristics of
algorithm to allow for the thermal characteristics of
the buses and integrate intermittent faults over time.
the buses and integrate intermittent faults over time.
Table 7.12
Table 7.12
Available Relay Function Settings
Available Relay Function Settings
1
1
The undervoltage relay has the capability for a fixed or inverse time delay. The accuracy of the inverse time delay is ±4%.
The undervoltage relay has the capability for a fixed or inverse time delay. The accuracy of the inverse time delay is ±4%.
2
2
Pickup may occur at no more
Pickup may occur at no more than 10 Hz below the nominal system frequency and never below 45 Hz. The setting range on 5
than 10 Hz below the nominal system frequency and never below 45 Hz. The setting range on 5 0 Hz systems is 45–50 Hz.
0 Hz systems is 45–50 Hz.
3
3
Pickup may occur at no mor
Pickup may occur at no moree than 10 Hz above
than 10 Hz above the nominal system frequency, which is 70 Hz
the nominal system frequency, which is 70 Hz for 60 Hz systems and 60 Hz
for 60 Hz systems and 60 Hz for 50 Hz systems.
for 50 Hz systems.
4
4
LTPU = long-time pickup setting. This relay is for alarm use only.
LTPU = long-time pickup setting. This relay is for alarm use only.
C
Ca
ap
pa
ab
biilliitty
y
O
Ovve
errvvo
olltta
ag
ge
e
U
Un
nd
de
errvvo
olltta
ag
ge
e
U
Un
nd
de
errffrre
eq
qu
ue
en
nccy
y
O
Ovve
errffrre
eq
qu
ue
en
nccy
y
P
Ph
ha
asse
e LLo
ossss
P
Po
ow
we
er R
r Re
evve
errssa
all
H
Hiig
gh C
h Cu
urrrre
en
ntt
S
Sy
yn
ncch C
h Ch
he
ecckk
A
Alla
arrm
m
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
TTrriip
p//O
Op
peen
n
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
N
No
o
YYeess
P
Piicckku
up
p
1
10
05
5––1
12
25
5%
% 1
1%
%
5
50
0––9
95
5%
%
5
50
0––6
60
0 H
Hzz,
, 0
0..1
1 H
Hzz
2
2
50–70 H, 0.1 Hz
50–70 H, 0.1 Hz
3
3
8-
8-50
50%,
%, 1%
1%
10
10–9
–990
90 kW
kW 10
10 kW
kW 50
50–2
–200
00% L
% LTP
TPU 5
U 5%
%
4
4
0–90 V
0–90 V,, 0.5 V
0.5 V,, 02 Hz,
02 Hz,
0.1 Hz, 0–60 D, 1D
0.1 Hz, 0–60 D, 1D
A
Accccu
urra
accy
y
±
±2
2%
%
±
±2
2%
%
±
±0
0..1
1
H
Hzz
±
±0
0..1
1
H
Hzz
±
±2
2%
%
±
±2
2%
%
±
±1
10
0%
%
±
±2
2%
%
TTim
ime d
e del
elay
ay
0.
0.5–
5–60
600
0 s,
s, 0.
0.5
5 ss
0.
0.5–
5–60
600 s
0 s, 0
, 0.5
.5 ss
1
1
0
0..5
5––6
60
00
0 ss,
, 0
0..5
5 ss
0
0..5
5––6
60
00
0 ss,
, 0
0..5
5 ss
0
0..5
5––6
60
00
0 ss,
, 0
0..5
5 ss
0
0..5
5––6
60
00
0 ss,
, 0
0..5
5 ss
1
1––1
15
5 ss,
, 1
1 ss
N
N//A
A
A
Accccu
urra
accy
y
±
±0
0..1
1
ss
±
±0
0..1
1
ss
1
1
±
±0
0..1
1
ss
±
±0
0..1
1
ss
±
±0
0..1
1
ss
±
±0
0..5
5
ss
±
±1
1 ss
N
N//A
A
D
Drro
op
p o
ou
utt
9
97
7%
% TTh
hrreessh
ho
olld
d
1
10
03
3%
% TTh
hrreessh
ho
olld
d
1
10
03
3%
% TTh
hrreessh
ho
olld
d
9
97
7%
% TTh
hrreessh
ho
olld
d
9
97
7%
% TTh
hrreessh
ho
olld
d
9
97
7%
% FFrreeq
qu
ueen
nccy
y
9
97
7%
% TTh
hrreessh
ho
olld
d
N
No
on
nee
B
Bllo
occkkiin
ng
g
V
Vo
olltta
ag
gee
N
No
on
nee
5
5––7
75
5%
%
5
5%
%
5
5%
%
5
5%
%
N
No
on
nee
N
No
on
nee
D
Deea
ad
d
B
Bu
uss
FFlleex
x
llo
og
giic
c
cco
on
nttrro
oll
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
YYeess
Ν
Ν
k=
k=0
0
N/2-1
N/2-1
Содержание Entellisys 4.0
Страница 4: ...2 Notes ...
Страница 6: ...4 Notes ...
Страница 8: ...10 Notes ...
Страница 38: ...108 Notes ...
Страница 39: ...109 Entellisys Low Voltage Switchgear Appendix D Time Current Curves ...
Страница 40: ...110 Appendix D Time Current Curves ...
Страница 41: ...111 Appendix D Time Current Curves ...
Страница 42: ...112 Notes ...