ABB HPA 12kV Guide

MV SF6 Indoor Circuit Breaker
Model HPA 12kV, 24kV & 36kV
1VDU22001-YN
Instruction for Installation, Service and Maintenance

Notice 1
Based on our own experience, you will obtain the best possible operational
reliability from our equipment by following the recommendations given in these
instructions.
The data contained herein purports solely to describe the product and is not a
warranty of performance or characteristics. It is with the best interests of our
customers in mind that we constantly strive to improve our products and keep
them abreast of advances in technology. This may, however, lead to
discrepancies between a product and this instruction.
Notice 2
Within the scope of this instruction, it is impossible to take into account every
possible eventuality which may arise with technical equipment in service. Please
consult our local agents in the event of any irregularities. Especially if not referred
to herein.
Notice 3
We expressly decline liability for any damage resulting from any incorrect
operation or wrong handling of our equipment, even if these instructions contain
no specific indication in this respect. We lay particular stress on the fact that only
genuine spare parts should be used for replacements.
Notice 4
Without our written consent it is not permissible to disclose copy or reproduce any
part of these instructions.

Contents
1.1 Data 03
1.2 Construction & Function 03
1.2.1 Breaker Poles 03
1.2.2 Operating mechanism 06
1.3 Maintenance 10
1.3.1 Maintenance schedule 10
1.3.2 Checking and refilling of SF gas 14
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1.3.3 Control of gas pressure 15
(Only for poles without pressure gauge)
1.3.4 Checking for operating speed and time 16
1.4 Service instruction 17
1.4.1 Fault finding chart 18
1.4.2 Replacement of operating coils 19
1.4.3 Replacement of micro switch 20
1.4.4 Replacement of auxiliary contacts 21
1.4.5 Replacement of motor 21
1.4.6 Replacement of damping device 21
1.4.7 Replacement of operating mechanism 22
1.4.8 Changing of breaker pole 24
1.4.9 HPA- operating gear adjustments 24
1.5 Accessories Spare parts and additional equipment 25
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HPA - BREAKER
1.1 Data
* Rated voltage kV 12 24 36
* Rated current A 1250, 1600, 1250, 2000, 1250,
2000, 2500, 2500 1600,
3000 2000
* Rated breaking current kA 40 26.3 26.3
* Rated making current (peak) kA 100 66 66
¨Short time rated current, 1/3 sec kA 40 26.3 26.3
¨Sf pressure, (over pressure) bar 2.5 2.5 2.5
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¨Electrical endurance, (number of
interruptions at rated breaking current) No 6 25 10
¨Mechanical endurance (number of
interruptions at rated current) No 10000 10000 5000
With maintenance as detailed in this manual.
2.2 Construction and function
The circuit breaker type HPA operator on the puffer principle.
2.2.1 Breaker poles
The breaker pole contains Sf gas (sulphur hexafluoride). This gas in many
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respects is one of the best media for circuit breaker in use for several decades
and its excellent performance is demonstrated by experience.
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Fig - 1
Structure of SF molecule
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The main characteristics of Sf gas are:
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¨The gas is neither combustible nor toxic.
¨It is chemically stable and will not age with time.
¨Breaking capacity of Sf6 gas is high even at relatively low pressure, because of
its superior dielectric and thermal properties.
¨The interruption in Sf gas is not forced and thus no over voltages are
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generated. No damping resistor or surge arrestor is needed, not even when
controlling small motors.
¨The dielectric strength at the relevant pressure is about 3 times higher than air
and is roughly at par with oil.
¨Any leakage is easily detected. To provide an extra margin of safety, the
breaker is capable of interrupting its rated current at rated voltage even at
atmospheric pressure.
The Sf breaker type HPA operates on what is usually referred to as the puffer
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principle. This involves compressing the gas between a static piston and a movable
cylinder during the interruption action. The compressed gas is then blown through a
nozzle in which the arc is taking place. A combination of careful attention to design
and the use of proven components has meant that arcing times in the new HPA
breaker have been reduced to a minimum. As a result, the new breaker contacts will
normally not need replacement during the service life of the breaker. The breaker pole
operation is shown in fig. 2.
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Fig - 2
(The Puffer Principle)

During the manufacture of the breaker pole, it is dried internally through vacuum
pumping. The breaker pole is then pressurized and also tested against leaks. Inside
the pole there is an absorption medium for the decomposition products of the gas. The
breaker poles should only be opened up by trained service personnel at the
manufacturing factory. The locking screws are tightened up to a predetermined
torque at the factory and must not be opened. If it is assumed that moisture has
entered (gas pressure = atmospheric 0) the pole, the same should be returned to the
factory for repair.
SF gas which has been exposed to arcs contain components which combined with
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moisture become corrosive. Filling up of gas should always be carried out according
to section 2.3.2 “Checking and Refilling of Sf gas”.
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Fig - 3a
(HPA breaker pole for 12 kV / 24 kV)

Fig - 3b
(HPA breaker pole for 36 kV)

1.2.2 Operating mechanism
The operating mechanism has a spring charging device which can be
operated by motor or by hand. Once a closing command has been given it is always
completed by the breaker; this is important in the event of short circuit. Since, the
circuit breaker closes completely before it opens, the correct contact speed and full
breaking capacity are obtained. The operating device has compression springs for
closing and opening. The opening spring is charged automatically when the breaker
is closed. A closed breaker with charged closing springs can be operated open - close
- open without intermediate motor or manual charging and the breaker can therefore
be used for auto re-closing. Charging of the closing spring can be discharged by
disconnecting the voltage to the motor and manually operate the breaker close -
open.
An indication shows whether the closing spring are charged or not and the number of
opening operations are recorded on a counter.
The motor can be supplied via a station battery, a network or via a voltage transformer
with a limit load of at least 300 VA. The motor starts after each closing operation and
charges the closing springs within 9 seconds. The breaker is fitted with a knob for
mechanical openings and with magnetic coils for closing and openings. The same
operating mechanism is used for all types of HPAbreaker.
The construction of the operating mechanism is shown in fig. 4. The device has two
shafts. The lower shaft (6) is connected to the breaker poles via links and is directly
actuated by the openings springs (5). The upper shaft (3) is connected directly to the
closing spring (11). These two shafts are linked via the driving disc (9) and the link
(12), and by the trip free device (14). The upper shaft is also connected to the charging
device via the trip-free device (1) and the link (4).
The latching and trip-free devices (1) and (14) are of the same type that have been
used inABB equipment since 1950 and have proven extremely reliable.
The motor operated unit consists of a toothed transmission gear with an eccentrically
driven tooth wheel as a last step. The operating device also contains auxiliary
contacts and trip coils.
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Fig - 4
(Principle diagram of Circuit Breaker)

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Fig - 5
(Circuit Breaker)

SPRING MECHANISM
SR. NO. ITEM DESCRIPTION PART NO.
1 & 2 Trip free device top IN 5436 0001 -A
3 Upper shaft assembly IN 5439 0002 - D
4 Link or pull rod IN 2104 00101 -AK
5 Opening spring IN 2192 0002 - D
6 Bottom shaft assembly IN 5439 0002 - B
7 Insulating links will not be supplied loose
8 Spring IN 2192 0001 - 21
9 Driver IN 2184 0002 - 34
10 A) Stopper or M16 X 50
Hex socket head
Grub screw IN 2122 2768 - 50
B) M16 nut IN 2126 2768 - 124
C) M16 spring washer IN 2154 2022 - 9
11 Closing spring IN 2192 0002 - B
12 Link IN 2194 0001 -AE
13 Contact will not be supplied loose
14 & 15 Trip free device (bottom) IN 5436 0001 - B
OPERATING MECHANISM
SR. NO. ITEM DESCRIPTION PART NO.
1 Closing coil IN 5274 0001 -A*
2 Closing Damping device IN 5256 0711 - 4
3 Micro switch IN 5445 0744 -A
4 Fixing bolts for
Operating device tripping coil IN 5274 0001 -A*
5 Short cover IN 5428 0002 - 2@
6 ‘O’ ring IN 2152 2018 - 10@
7 Density switch IN 5663 0162 - 1
8 Auxiliary contact IN 5218 0004 - 1
9 Motor IN 4461 0002 - E*
10 Indicating plate assly. IN 5428 0001 - M
11 Counter IN 5692 0501 - 2
*Please specify voltage.
@ If density Switch is used, short cover will be supplied in place of refilling vent
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