GCB Type HEC 7S
ABB Generator Circuit-Breaker System
Solution for large power plants
Data &
Dimensions
ABB
voltage transformers, surge capacitors and
surge arrester,
• all integrated and mounted in the phase enclosures.
Applications
The HEC 7S generator circuit-breaker system has
been developed as a system suitable for application
in all types of power plants.
Modular Design Concept
The HEC 7S generator circuit-breaker is also suitable for retrofitting in existing power plants when
these are modernized, extended and/or automated.
The standard execution of the HEC 7S includes:
• SF6 circuit-breaker and disconnector
• earthing switches on one or both sides
• current transformers on one or both sides with
up to three cores
• one or two voltage transformers on one or both
sides with one or two secondary windings
• surge arrester on disconnector side
• surge capacitors on generator- and transformer
side.
The HEC 7S generator circuit-breaker system is
available for indoor installation.
Characteristics
• Three-phase system with a SF6 circuit-breaker
and disconnector in single-phase enclosures,
supplied fully assembled on a common frame,
with operating mechanisms, supervisory and
control equipment
• the phase distance can be selected to suit the
busbar in the power plant
• additional to the circuit-breaker and series disconnector, the generator circuit-breaker system
is available with earthing switches, current and
As required by the plant layout, individual components can be deleted from the standard execution.
Equipment limits
12 11
9
10
19
18
18
T
G
14
1
2
3, 4
9, 10, 11, 12
13, 14
15
16, 17
18
19
17 4
1
2
3 16 15
13
Circuit-breaker
Disconnector
Earthing switches
Voltage transformers
Current transformers
Surge arrester
Surge capacitors
Terminals (limit of supply)
System enclosure
ABB
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Technical Data
General
Rated maximum voltage:
Rated frequency
Rated continuous current
Limiting conditions for rated continuous current
• installation
• ambient temperature
• temperature of busbar conductor
• temperature of busbar enclosure
• return current in enclosure
30 kV, rms
50/60 Hz
23000/22000 A
indoor
40
90
70
> 95
°C
°C
°C
%
* Service currents for other conditions on request
Rated dielectric strength:
Power frequency, 1min
• to ground and across circuit-breaker/switch contacts
• across isolating distance of disconnector
• phase enclosure to ground
Impulse, 1.2/50µs wave
• to ground and across circuit-breaker/switch contacts
• across isolating distance of disconnector
Seismic acceleration withstand
Degree of protection
• control cubicle and mechanism
• phase enclosure
Installation, horizontal
Circuit-breaker
Peak withstand current
Closing and latching capability
Short-time current-carrying capability
Rated short-circuit current
System-source interrupting capability
• symmetrical
• degree of asymmetry
• transient recovery voltage (TRV) rating
Generator-source interrupting capability
• symmetrical
• degree of asymmetry
• transient recovery voltage (TRV) rating
Out-of-phase interrupting capability (180°)
• symmetrical
• degree of asymmetry
• transient recovery voltage (TRV) rating
Load current interrupting capability
• symmetrical
• degree of asymmetry
• transient recovery voltage (TRV) rating
Excitation current switching capability
Interrupting time (till arc extinction)
Opening time (till contact separation)
Closing time (till contact touch)
Service capability/maintenance
80 kV, rms
88 kV, rms
2 kV, rms
IEC 61166
IEC 60529
IEC 60529
150 kV, peak
165 kV, peak
Class AF5 with 5 %
damping
IP54
IP65
indoor
IEEE Std C37.013
390 kA, peak
390 kA, peak
140 kA/3s
140 kA, rms
140 kA, rms
75 %
6.0 kV/µs
130 kA, rms
110 %
2.2 kV/µs
135 kA, rms
75 %
7.4 kV/µs
23000 A, rms
0 %
1.6 kV/µs
100 A, rms
≤ 56 ms
30 ± 3 ms
75 ± 15 ms
ABB
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Technical Data
• short-circuit current interruptions, 140kA
• rated current interruptions
• no-load mechanical
• elapsed time in service
Rated duty cycles
• short-circuit
• load currents up to rated current
• mechanical
Control voltage
Operating mechanism
• type
• pump motor, 220VDC or AC
• number of stored operations
SF6 gas
• filling pressure at 20°C
• leakage rate
Noise level, 0.9 m distance
Disconnector
5
150
10000
15
CO
CO
CO
years
CO-30min-CO
CO-3min-CO
CO-30sec-CO
110/220 or 125/250 VDC
spring-hydraulic
1100 W
2 CO
620 kPa
< 0.5 %/a
< 127.6 dB, peak
IEC 62271-102
Peak withstand current
Short-time withstand current
Operating time, close or open
Operating mechanism:
Service capability
• no-load mechanical
• elapsed time in service
Earthing switch
Peak withstand current
Short-time withstand current
Operating time, close or open
Operating mechanism:
Service capability
• no-load mechanical
• elapsed time in service
Current transformer
Type
Primary current
Secondary current
Cores
Output
• IEC:
protection
metering
• ANSI: protection
metering
motor, 3x400 V, 3-phase
390
140
2
1130
kA, peak
kA/3s
s
W
10000 CO
15 years
IEC 62271-102
motor, 3x400 V, 3-phase
390
140
2
1130
kA, peak
kA/1s
s
W
5000 CO
15 years
IEC 60044-1
toroidal-core
up to 23000 A, rms
5 / 1 A, rms
1 to 3*** nos.
5P10 to 10P20 / 5A
5P10 to 10P20 / 1A
0.1 to 0.2 // 5 / 1A
C400/C800 / 5A
C400/C800 / 1A
0.3 / 5A
max.. 200*** VA
max. 100 VA
max. 60 VA
max. 100/200 VA
max. 20/40 VA
B-0.1 to B-1.8
*** depending on class
and secondary current
Voltage transformer
IEC 60044-2
ABB
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Technical Data
Type
Primary connection
Primary voltage
Secondary voltage
Secondary connection
Secondary windings
Primary fuses
Output
• IEC:
protection
metering
• ANSI:
Surge arrester
Type
Rated discharge current, 8/20µs
Impulse withstand current, 4/10µs
Line discharge according
• IEC 60099-4
• IEEE (ANSI) C62.11
Capacitor
epoxy resin
Y
max. 30/√3 kV, rms
as per request V, rms
Y / open ∆
1 or 2 nos.
optional
3P or 6P
0.2 to 3.0
0.3
0.6
1.2
max. 450 VA
max. 30 to 150 VA
WX
WX, WXY
WX, WXY, WXYZ
IEC 60099-4
POLIM-H 12...37
metal-oxide
20 kA
100 kA
class 4
station class
IEC 60358
Type
Capacitance:
• transformer side
• generator side
PCB free
260 nF
130 nF
Weight
Generator circuit-breaker system with maximum amount of equipment.
(Note: the weight depends on the detailed design of the apparatus and may
vary considerably)
to follow kg
ABB
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Dimension drawings
(Refer to Drawing No.: 1HC0025395 Rev.AA)
Remark:
In pursuance of our continuing improvement policy, technical data of equipment described in this publication is subject to change
without notification.
ABB
ABB Switzerland Ltd.
High Voltage Products
Brown Boveri Strasse 5
CH.8050 Zurich/ Switzerland
Phone: +41 58 588 34 24
E-mail: gcb_sales@ch.abb.com
www.abb.com
1HC0015509/010/AA
ABB
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