Spring operating mechanism for high voltage circuit breakers
Model FSA 1
3
Introduction
Main features and advantages
n
The immediate availability of stored energy without any loss ensures constant contact travel behaviour
n A minimum number of mechanical components increas the reliability n No als or valves
n Accessible and clear arrangement of components in the operating mechanism cubicle n Easy access to all components without
obstruction, after lowering the outer housing n The closing spring can be tensioned manually n Maximum availability and reliability n中午的英语
Minimal maintenance costs
Design
The principal components and the design can be en in Figure 1. The well-sized position and spring tension indicators are readily visible through the obrvation window in the door, and allow positive identification of the breaker position, and of the state of tension of the closing spring. The electrical monitoring and control units are easily accessible after opening the door. The electrical leads are all taken to the terminal blocks. The sheet metal housing including the door, can be removed for ready access to all the internal components. The closing and opening springs are arranged on the two sides. All movements are frictionless damped by means of a dashpot.
Mode of operation
The spring operating mechanism, the design of which is shown schematically in Figure 2, consists esntially of two tension spring systems. Closing spring(5) is tensioned by means of the motor(13),over the worm gear drive(21). This provides the energy for a closing operation, which will tension the opening spring(6) during the closing operation.
Charging of closing spring
The main shaft(1) is rotated through 180 degrees via the worm gear drive(21), by means of the motor(13) or the hand crank(14), in this way tensioning the closing spring(5).
Availability is of paramount importance for efficient electricity supply. Reliability of lines, relays and high voltage apparatus are important factors which increa availability. With improved designs of SF6high voltage circuit breakers, incread attention is paid to reliability. International statistics, like Cigre’s report, have shown that 80% of the failures in a circuit breaker are of mechanical origin. Most of the failures have been traced to the operating mechanisms. The dynamic mechanical and
electrical performance of a circuit breaker is complicated. Within milliconds, the
operating mechanism has to change the circuit breaker from a perfect conductor to a perfect
insulator. A failure in the operating mechanism may result in a failure of the total breaking operation. The FSA 1 operating mechanism is characterid by an especially robust, simple, and thereby functionally reliable design. It is suitable for three pole as well as single pole application.
作业简笔画Closing operation
On a closing signal, the locking latch(7) is
relead from the main shaft and closing spring(5)discharges itlf. In this way the transfer cams rotate via the transfer lever(9). Switching shaft(2)is actuated and the breaker clos,
simultaneously tensioning and locking the opening spring(6). The motor(13) tensions the closing spring(5) are every closing operation. It is stopped via the motor limit switch(16).
Opening operation
写人记事On an opening signal, locking latch(8) is relead from switching shaft(2) and the opening spring(6)discharges, thereby opening the breaker.Auxiliary contacts(15) are mechanically linked to the switching units and follow the breaker operation exactly.
Mounting of the operating mechanism
The operating mechanism cubicle (Figure 1),
containing the spring operating mechanism FSA 1as well as the control and monitoring units is easily attached to the circuit breaker. After mounting, the mechanism cubicle to the pole support the operating rod is coupled to the
breaker poles. In ca of single pole operation the control and monitoring elements are positioned in each mechanism cubicle. Special provisions for supporting the operating mechanism during asmbly are not required.
Maintenance
With minimal maintenance, the spring operating mechanism FSA 1 offers distinct advantages,which contribute to a reduction in operational costs.
Lubrication of the transmission shafts and worm-gears as well as the gear wheels is required for the first time only after 2500 CO switching operations, while an overhaul of the complete operating mechanism should be carried out after 5000 CO operations.
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1Main shaft 2Switching shaft 3Hydraulic damper 4Discharge lever 5Closing spring 6
Opening spring
Fig. 1
Design and internal view of the spring operating mechanism FSA 1.
References to Figures 1 and 27 C locking latch 8O locking latch 9 C transfer lever 10 C relea coil 11O trip coil
毕加索简介及代表作品12
Breaker operations counter
13Motor
14
Hand crank (for manual operation)15Auxiliary contacts 16Motor limit switch 17 C manual operation
18O manual operation 19
Spring tension indicator for the CO spring 20Position indicator 21Worm gear drive
Rear View Front View
214
13
15
19
210
35
121920171018
12192
11
6
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Fig. 2
Schematic layout of the spring operating mechanism FSA1. Reference as given on Page 4.
5
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Optional features
Auxiliar Auxiliary contacts. y contacts. y contacts. The operating mechanism can be supplied with 6 N/O plus 7 N/C additional auxiliary contacts.
Pr Protective cover otective cover otective cover for the terminals (only for the
incoming AC cables). Made of transparent plexiglass.Lockable cover Lockable cover for control panel. A hinged lockable cover protects the entire operator’s panel.
Lighting ar Lighting arrangement for cubicle illumination.rangement for cubicle illumination.Fus. Fus. UK 10,3-HESi or HRC fu link. Quantity,type and position in circuit diagram to be stated when ordering.
Central contr Central control cubicl ol cubicl ol cubicle. This is needed if three pole operation is required for single pha operated breakers.
Technical data
Motor
Universal ries motor for voltage 110-125 V or 220-250 V . a.c
Starting
Normal Rated current
current voltage Instantaneous V approx A approx A 220204110
40
8美丽的人
Spring charging time 15 c. max.如何泡红茶
Operating coils
Operating Rated voltage Power
龙的英文coil
V , d.c
consumption approx. W
Closing coil 110-125, 220-250500Opening coil
110-125, 220-250
500
Voltage operating range for the motors and the operating coils meet the requirements in IEC 62271-100.
Auxiliary contacts
Breaking current Rated Rated DC AC
voltage current 20 ms cosø = 0,95V A A A 11020420220
20
2
20
The operating mechanism normally includes 6 N/O and 7 N/C spare auxiliary contacts.
Heating elements
Power consumption Continuously Thermostatically Rated voltage connected controlled V , AC W W 210-24070140110-127
70
140
Power frequency test, 50 Hz as per IEC 60694
Auxiliary circuit 2.0 kV Motor
1.5 kV
Degree of protection as per IEC 529 IP 55Terminal blocks Through 6 mm² block Cable-entry plate
Size 135 x 200 mm
Testing
The spring mechanism has pasd type testing according to IEC 62271-100. Mechanical life test is
performed up to 10,000 operations. Before delivery each operating mechanism has to pass rigorous routine testing. For each breaker a routine test report is issued showing the actual test result.
