Vacuum Circuit-Breakers, Type HVX 12 – 24 kV, of cassette ...

1 Vacuum Circuit-Breakers, Type HVX12 24 kV, of cassette design , cassette with motor driveOperating InstructionsNo. 531 321, Edition 09/003 Table of Contents1 Operating Conditions42 design , supplementary Accessories and Method of Supplementary accessories available on Method of operation63 Transport, Reception and Storage84 Assembly and Assembly of circuit-breaker types Test Commissioning95 Operating Operating instructions for circuit-breaker types Operating instructions for the spring mechanism106 Operating Errors117 parts148 Malfunctions159 Circuit-Breakers and Spring Mechanisms - Drawings and Keys Circuit-breaker drawing and key (630 A) Circuit-breaker drawing and key (1250 A) Circuit-breaker drawing and key (1600 A, 2000 A, 2500 A)

2 Mechanism of cassette with motor drive drawing and Spring mechanism drawing and Rack-in / rack-out mechanism drawing and Drawing with reference dimensions for rail2310 Inspection Record for Vacuum Circuit-Breaker HVX 244 The HVX series circuit-breakers arevacuum circuit-breakers forapplication in 12 to 24 kV indoorswitchgear conditionsThe circuit-breakers operateperfectly under the following climateconditions corresponding to IEC60694 ambienttemperature The maximum temperature of theambient air is 40 C, the averagemeasured over a 24 h period notexceeding max.

3 35 C. The minimum temperature of theambient air is -5 altitudeThe circuit-breakers can be installedat altitudes up to 1000 m above sealevel. At higher installation altitudesreduced withstand voltage must betaken into account. It may benecessary to use circuit-breakers ofthe next-higher voltage air pollutionThe ambient air is not essentiallypolluted by dust, smoke, corrosive orinflammable gases and vapours, orby atmospherichumidity The average relative humidity,measured during a 24 h period,does not exceed 95 %.

4 The average vapour-pressure,measured over a 24 h period,does not exceed 22 mbar. The average relative humidity,measured over a one-monthperiod, does not exceed 90 %. The average vapour pressure,measured over a one-monthperiod, does not exceed18 mbar. Under these conditions condensation may occur: -Condensation must be expectedif sudden temperaturefluctuations occur in periods withhigh atmospheric can be preventedby appropriate design andventilation of the building andheating the switchgear, or bymeans of dehydrators.

5 These measures are recom-mended if an atmospherichumidity in excess of 75 % is tobe If circuit-breakers are to be usedunder conditions differing fromthose described above, themanufacturer must be consulted!Attention:It is essential that no changes are made to the circuit-breaker !Important instructions are marked .Numbers and capital letters indicated in brackets refer to the illustrations on pages 16 to completeThe circuit-breaker consists of thedrive housing (127), the three poleswith current path (104-108, 123-124), the three switchingmechanisms (112-119), the cassettewith motor drive (128) and thespring mechanism (102).

6 CasingThe drive casing (127) accom-modates the main shaft with thespring mechanism (102), controland operating devices and theconnection elements to the threepole frames (101). with current pathThe primary current path (104-108,123-124) consists of the upperconductor (104), the vacuuminterrupter (105), the shield or thecontact terminal (106), the flexibleconnector (107), the lowerconductor (108), the isolatingcontact (123) and the insulatingconduit (124).

7 MechanismThe switching mechanism (112-119)consists of the spacer with screw(112), the contact pressure spring(113), the spacer (114), the pressurerod (115), the bearing (116), thelever (117), the connection to thedrive unit (118) and the coupling(119). with motor -driveThe cassette with motor drive (128)accommodates the rack-in andrack-out mechanism, the connectorcarrier (201) with connector and theinterlock between the rack-in andrack-out mechanism and the springmechanism (102). mechanismThe HVX circuit-breakers are drivenvia a motorized spring mechanismFK equipmentEvery FK drive is equipped with thefollowing mechanical elements.

8 Hexagon socket for manualcharging of the spiral spring ON pushbutton (10) OFF pushbutton (12) Circuit-breaker position indicator Closing spring position control of the circuit-breaker driveThe electrical equipment for thespring mechanism (102) FK 2-01 isdescribed in the circuit diagramsupplied with the , protectionThe drive FK 2-01 can be used forauto-reclosing (OFF-reclosing). Inconjunction with the appropriateelectrical equipment, a controlsystem can be designed togetherwith the secondary and to illustration on page spindle (208) is located in thecassette with motor drive (128) andthe spindle bearing (205), where it isalso held axially by means of alocking ring.

9 The two interlockrockers (205) are slipped on thecassette with motor drive (128) forlongitudinal protection, andsuspended on the 2 journals (206). to illustration on page multi-stage spur reductiongearing (210) is fixed in the cassettewith motordrive (128) via the spindle(208) which is mounted to thegearing. The motor is fixed in thegearing (210). An auxiliary crank forHVX (306) can be slipped onto oneshaft of the bearing (210) (refer toillustration on page 22).The 2nd gearing stage is designed asan overload coupling.

10 This allowsthe final stops of the spindle (208) tobe approached without damagingthe spindle or the gearing (210). control of the rack-inand rack-out motorThe contactors K1 K2 control themotor. They are mounted onto thehead plate of the circuit-breakerdrive. The limit switches S4 and S5are mounted to the gearing (210).(Refer to corresponding diagrams).2 design , supplementary Accessories and Method of carrierRefer to illustrations on page connector carrier (201) is screw-fastened tightly in the cassette withmotor drive (128).