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Maintenance and Troubleshooting

Inspect For

Sub-Assembly

Item

1. Cleanliness

2. Contact erosion. Note: Perform with Manual Spring Checks

3. Vacuum integrity. Note: Perform with High Potential Tests

Vacuum Interrupter

Primary Power Path

Table 7. Periodic Maintenance and Lubrication Tasks

Vacuum Interrupter
Contact Resistance

1. Record contact resistance with contacts closed, and re-check

each year to monitor condition.

Interrupter Operator
Mechanism

Cleanliness

1. Dirt or foreign material

Fasteners

1. Tightness of nuts and other locking devices.

Manual Spring Check

1. Smooth operation of manual charging, and manual

closing and tripping.

Lubrication

1. Evidence of excessive wear

2. Lubrication of wear points

Electrical Controls

Wiring

1. Mechanical damage or abrasion

Terminals and
Connectors

1. Tightness and absence of mechanical damage

Close and Trip
Solenoids, Anti-Pump
Relay, Auxiliary
Switches, Secondary
Disconnect

1. Automatic charging

2. Close and trip with control power

High Potential Test

Primary Circuit to
Ground and between
Primary Disconnects

1. 60 second withstand, 60 Hz.

Refer Table 3 for Voltage to be used.

Control Circuit
to Ground

1. 60 second withstand, 1500V, 60 Hz

Insulation

Barriers and all
Insulating Components

1. Cleanliness

2. Cracking, crazing, tracking, or other sign of deterioration

Содержание 3AH

Страница 1: ...Vacuum Circuit Breaker Operator Module Type 3AH 4 16kV to 38kV Instructions Installation Operation Maintenance SGIM 9918 Medium Voltage Equipment ...

Страница 2: ...tion with installation operation or maintenance Should further informa tion be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to the local sales office The contents of this instruction manual shall not become part of or modify any prior or existing agreement commitment or relationship The sales contract cont...

Страница 3: ...ng Figure 6 12 Manual Opening Figure 6 12 Indirect Releases Dual Trip or Undervoltage 12 Secondary Shunt Release 12 Undervoltage Release 13 Construction and Mode of Operation of Secondary 13 Release and Undervoltage Release See Figures 9 10 and 11 13 Capacitor Trip Device 13 Shock Absorber 14 Auxiliary Switch 14 Maintenance 15 Introduction and Maintenance Intervals 15 Recommended Hand Tools 15 Rec...

Страница 4: ...ords Danger Warning and Caution used in this manual indicate the degree of hazard that may be encountered by the user These words are defined as Danger Indicates an imminently hazardous situation which if not avoided will result in death or serious injury Warning Indicates a potentially hazardous situation which if not avoided could result in death or serious injury Caution indicates a potentially...

Страница 5: ...et for later use if the breaker is to be stored prior to its installation 2 Inspect for concealed damage Notification to carrier must take place within 15 days to assure prompt reso lution of claims 3 Each circuit breaker should be appropriately lifted to avoid crushing the side panels of the breaker or dam aging the primary disconnect subassemblies Type 3AH circuit breakers weigh Table A 4 4 The ...

Страница 6: ...ntenance Section of this manual Automatic Spring Charging Check Note A temporary source of control power and test leads may be required if the control power source has not been connected to the switchgear Refer to the specific wiring information and rating label for your circuit breaker to de termine the voltage required and where the control volt age signal should be applied When control power is...

Страница 7: ...ee vacuum interrupters a stored energy operating mechanism necessary electri cal controls and interlock devices disconnect devices to Figure 2 3AH Vacuum Circuit Breaker Module connect the breaker to both primary and control power and an operator housing In a typical installation in a drawout truck insulating barriers are located between the vacuum interrupters and along the sides This section des...

Страница 8: ... mary disconnects Each circuit breaker has three upper and three lower primary disconnect pad provisions to perform the connection to the switchgear Phase Barriers Plates of glass polyester insulating material are attached to the circuit breaker and provide suitable electrical insu lation between the vacuum interrupter primary circuits and the housing Stored Energy Operating Mechanism The stored e...

Страница 9: ...s the interrupter against the surrounding atmosphere Switching Operation Figure 5 When a closing command is initiated the closing spring which was previously charged by hand or by the motor actuates the moving contact through jack shaft lever in sulated coupler and angled lever The forces that occur when the action of the insulated cou pler is converted into the vertical action of the moving con t...

Страница 10: ...sing spring charge indicator 59 Operation counter 61 8 Shock absorber 62 Closing spring 62 2 Crank 62 3 Cam disc 62 5 Lever 62 5 2 Latching pawl 62 6 Drive lever 62 8 Trip free coupling rod 62 8 1 Spring return latch 62 8 2 Trip free coupling link 62 8 3 Trip free coupling lever 63 Jack shaft 63 1 Lever 63 5 Lever 63 7 Lever 64 Tripping spring 64 1 Pawl 64 2 Pawl 64 3 Lever 64 3 1 Pawl roller 68 A...

Страница 11: ...ng is being charged cam disc 62 3 follows idly i e it is brought into position for closing Closing See Figure 6 If the breaker is to be closed locally the closing spring is released by pressing CLOSE button 53 In the case of remote control the spring release coil 52SRC 53 1 un latches the closing spring As the closing spring discharges the charging shaft is turned by crank 62 2 The cam disc 62 3 a...

Страница 12: ...Interrupter Operator Description Figure 7 Operator Sequential Operation Diagram 11 ...

Страница 13: ...ondi tion indicator will now read Discharged Manual Opening Figure 6 The tripping spring is charged during closing To open the breaker press the trip button 54 and Open will be dis played by indicator 58 Indirect Releases Dual Trip or Undervoltage The indirect release provides for the conversion of mod est control signals into powerful mechanical energy im pulses It is primarily used to trip mediu...

Страница 14: ...et armature 9 The arma ture 9 is pivoted in front of the poles of the U shaped magnet core 1 and is pulled away from it by the tension spring 11 If the magnet coil 7 of the shunt release 3AX1101 is ener gized by a trip signal or if the tripping pin 15 is mechani cally actuated magnet armature 9 is swung against the pole faces When this happens the latch 25 loses its sup port and releases the strik...

Страница 15: ... during the conclusion of an opening operation The shock absorber action affects only the end of an opening opera tion Auxiliary Switch Figure 6 shows the breaker mounted auxiliary switch This switch provides auxiliary contacts for control of circuit breaker closing and tripping functions Contacts are avail able for use in relaying and external logic circuits This switch is driven by linkages conn...

Страница 16: ...d safe operation The frequency of inspection periodic cleaning and preventive mainte nance schedule will depend upon the operation conditions NFPA Publication 70B Electrical Equipment Maintenance may be used as a guide to establish such a program A preventive maintenance program is not intended to cover reconditioning or major repair but should be designed to reveal if possible the need for such a...

Страница 17: ...or since charging of the springs is necessary to place the contacts in the closed position Also the vacuum integrity check is usually performed in conjunction with the High Potential tests These instructions follow the recommendation that these tests contact erosion manual spring charging check and vacuum integrity high potential tests will be combined as described Cleanliness Check Figure 2 is a ...

Страница 18: ...d Contact Erosion Checks Perform the Manual Spring Charging Check contained in the section describing the Installation Check and Initial Functional Tests The key steps of this procedure are re peated here 1 Insert the hand charging crank into the manual charge socket at the front of the operator control panel Turn the crank clockwise about 45 revolutions to charge the closing springs Continue cran...

Страница 19: ...ack Close pushbutton Nothing should hap pen The manual spring check should demonstrate smooth operation of the operating mechanism Electrical Control Checks The electrical controls of the 3AH circuit breaker should be checked during inspections to verify absence of any me chanical damage and proper operation of the automatic spring charging and Close and Trip circuits Unless otherwise noted all of...

Страница 20: ...Maintenance Figure 15 Typical Vacuum Interrupter Contact Life Curves 19 ...

Страница 21: ...ditional checks of the spring charging motor are nec essary Vacuum Interrupters The life expectancy of vacuum interrupters is a function of the number of interruptions and magnitude of current in terrupted Table 3 and Figure 15 They must also be replaced before certain amount of me chanical operations Table 5 or when the contacts have been eroded beyond allowed limits Vacuum tube replace ment proc...

Страница 22: ...ive links as well as the insulating tension struts between the upper and lower vacuum interrupter supports If these insulation components are contaminated or defective the test voltage will not be sustained If so clean or replace the affected components and retest As Found Insulation and Contact Resistance Tests As Found tests verify the integrity of the breaker insula tion system Megger or insula...

Страница 23: ...re 16 Contact resis tance should not exceed the values listed in Table 5 Table 5 Maximum Contact Resistance Inspection and Cleaning of Breaker Insulation 1 Perform the Spring Discharge Check on the circuit breaker after all control power is removed The Spring Discharge Check consists of 1 depressing the red Trip pushbutton 2 then depressing the black Close pushbutton and 3 again depressing the red...

Страница 24: ... all screw connec tions are tight Replacement of Vacuum Interrupters Replacement interrupters are furnished as a complete as sembly They have been completely tested and dielectrically and mechanically conditioned It is recommended that one interrupter be removed and replaced completely rather than removing two or more interrupters at a time The following procedure in check list format describes th...

Страница 25: ...inal clamp cannot be easily removed STOP check to be certain hardware is loose and that the clamp is not binding 2 Installing an Interrupter NOTE Replacement interrupter 30 will be received from the factory with an eyebolt 36 3 in place ad justed and torqued to specific requirements DO NOT ALTER THE ADAPTER SETTING 2 1 Inspect all silver plated connection surfaces for cleanliness Clean only with a...

Страница 26: ...n has ends which have been generously chamfered 2 12 Open and close breaker several times and then check to see that all bolted joints and devices are tight 3 Checking the Contact Stroke 3 1 Open the circuit breaker 3 2 Free insulating coupler 48 by removing pin 48 5 The interrupter contacts must now close automatically as a consequence of atmospheric pressure 3 3 Observe the terminal clamp 29 2 t...

Страница 27: ...pring Check 1 Smooth operation of manual charging and manual closing and tripping Lubrication 1 Evidence of excessive wear 2 Lubrication of wear points Electrical Controls Wiring 1 Mechanical damage or abrasion Terminals and Connectors 1 Tightness and absence of mechanical damage Close and Trip Solenoids Anti Pump Relay Auxiliary Switches Secondary Disconnect 1 Automatic charging 2 Close and trip ...

Страница 28: ...onnect contacts 13 or 15 are not engaging Check and correct as required 4 Failure of anti pump relay 52Y contacts 21 22 or 31 32 or 13 14 Check and replace as required 5 Failure of close coil solenoid 52SRC Check and replace as required 6 Auxiliary switch NC contacts 41 42 are open when breaker con tacts are open Check linkage and switch Replace or adjust as nec essary 7 Spring charged switch LS9 ...

Страница 29: ...r is closed Check linkage and switch Replace or adjust as necessary 1 Failure of tripping spring or its mechanical linkage Check and replace if required 1 Mechanical failure of operating mechanism Check and contact factory or authorized service shop 2 One or more of the vacuum in terrupters are held closed Check and replace as necessary 1 Tripping signal remains energized on secondary disconnect c...

Страница 30: ...000 3000 1200 2000 1200 2000 3000 1200 2000 3000 kA rms sym kA rms sym 29 41 33 18 28 37 21 kA rms kA peak Footnotes 1 High close and latch momentary rating available for special application 2 Maximum voltage for which the circuit breaker is designed and the upper limit for operation 3 K is the ratio of the rated maximum design voltage to the lower limit of the range of operating voltage in which ...

Страница 31: ...c Component Short Time Current I 3 seconds Closing Latching Momentary Asymmetrical 1 55 x I Closing Latching Momentary Peak 2 6 x I 1200 2000 2 2 2 2 2 2 2 2 2 2 2 31 5 40 50 40 20 25 31 5 40 50 25 31 5 47 47 47 47 47 47 47 47 47 47 47 31 5 40 50 40 20 25 31 5 40 50 25 31 5 49 62 78 62 31 39 49 62 78 39 49 82 104 130 104 52 65 82 104 130 65 82 4 76 4 76 4 76 8 25 15 0 15 0 15 0 15 0 15 0 27 0 38 0...

Страница 32: ...Interrupting Capacity in Amperes Non Inductive Inductive 20 20 10 10 5 5 20 1 5 5 3 3 120 VAC 240 VAC 48 VDC 125 VDC 250 VDC Type of Circuit to Interrupt 20 1 1 2 Contacts in series Table A 4 Circuit Breaker Weights Weights approx Lbs approx kg 1 Breaker Type Continuous Current Amperes 1200 A 2000 A 3000 A Interrupting Capability kA rms sym MVA Maximum Voltage kV rms sym 1 For shipping add 100 lbs...

Страница 33: ... 9918 9 2001 Printed in U S A 2001 Siemens Power Transmission Distribution Inc SIEMENS is a registered trademark of Siemens AG Siemens Power Transmission Distribution Inc P O Box 29503 Raleigh NC 27626 0503 ...

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