Siemens 3AH Instructions, Installation, Operation, Maintenance
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Siemens 3AH Instructions, Installation, Operation, Maintenance

Vacuum circuit breaker operator module 4.16kv to 38kv, medium-voltage equipment
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Vacuum Circuit Breaker
Operator Module
Type 3AH
4.16kV to 38kV
Instructions
Installation
Operation
Maintenance
SGIM-9918
Medium-Voltage
Equipment

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Summary of Contents for Siemens 3AH

  • Page 1 Vacuum Circuit Breaker Instructions Installation Operator Module Operation Maintenance Type 3AH SGIM-9918 4.16kV to 38kV Medium-Voltage Equipment...
  • Page 2 It does not relieve the user of responsibility to use sound practices in application, installation, operation, and mainte- nance of the equipment purchased. Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations.

  • Page 3: Table Of Contents

    Vacuum Circuit Breaker Operator Module Table of Contents Introduction and Safety ............3 Maintenance ................. 15 Introduction ................3 Introduction and Maintenance Intervals ......... 15 Qualified Person ............... 3 Recommended Hand Tools ............ 15 Signal Words ................3 Recommended Maintenance and Lubrication ....... 15 Checks of the Primary Power Path ........

  • Page 4: Introduction And Safety

    Introduction and Safety Introduction Signal Words The 3AH family of vacuum circuit breakers is designed to The signal words “Danger”, “Warning” and “Caution” meet all the applicable ANSI, NEMA and IEEE standards. used in this manual indicate the degree of hazard that may Successful application and operation of this equipment be encountered by the user.

  • Page 5: Receiving, Handling And Storage

    Receiving, Handling and Storage Introduction This manual covers the Receiving, Handling and Storage instructions for Type 3AH vacuum circuit breakers shipped Heavy weight. Can cause death, serious separately from the switchgear. This section of the manual injury, or property damage.

  • Page 6: Installation Checks And Initial Functional Tests

    This check assures that both the tripping and closing springs are fully dis- charged. Figure 1. Front Panel Controls of Type 3AH Circuit Breaker Hazardous voltages and high-speed moving parts. connected to the switchgear. (Refer to the specific wiring...

  • Page 7: Interrupter/Operator Description

    Introduction connect the breaker to both primary and control power The Type 3AH vacuum circuit breaker operator is intended and an operator housing. In a typical installation in a for application in a drawout truck for use in medium volt- drawout truck, insulating barriers are located between the age metal-clad switchgear.

  • Page 8: Vacuum Interrupters

    Vacuum Interrupters lation between the vacuum interrupter primary circuits and The operating principle of the 3AH vacuum interrupter is the housing. simple. Figure 3 is a cutaway view of a typical vacuum interrupter.

  • Page 9: Construction (Refer To Figures 1, 2 And 5)

    2. Mechanisms to release closing and tripping actions. 3. Means of transmitting force and motion to each of three pole positions. Figure 5. 3AH Pole Assembly 4. Operate all these functions automatically thru electri- Breaker Pole (Figure 5) cal charging motor, cutout switches, antipump relay,...
  • Page 10 Interrupter/Operator Description 50.3 50.1 62.6 62.5.2 55.2 50.2 50.3.1 62.3 62.5 68.7 62.2 53.1 55.1 50.4 54.1 68.1 50.4.1 64.1 62.8.1 64.2 64.3 61.8 62.8 62.8.2 63.5 62.8.3 (behind 62.8) Manual spring charging crank Closing spring charge indicator Jack shaft 50.1 Manual spring charging access hole Operation counter...

  • Page 11: Construction

    Interrupter/Operator Description Construction Closing (See Figure 6) The essential parts of the operating mechanism are shown If the breaker is to be closed locally, the closing spring is in Figure 6. The control and sequence of operation of the released by pressing CLOSE button (53). In the case of mechanism is described in Figure 7.
  • Page 12 Interrupter/Operator Description Figure 7. Operator Sequential Operation Diagram.

  • Page 13: Rapid Auto-Reclosing

    Interrupter/Operator Description Elementary Diagram Figure 8. Typical Elementary Diagram Rapid Auto-Reclosing Manual Opening (Figure 6) Since the closing spring is automatically recharged by the The tripping spring is charged during closing. To open the motor operating mechanism when the breaker has closed breaker, press the trip button (54) and “Open”...

  • Page 14: Undervoltage Release

    Interrupter/Operator Description Undervoltage Release Since the striker pin of the undervoltage release 3AX1103 The undervoltage release is used for continuous monitor- is latched only when the armature is attracted, this trip is ing of the tripping supply voltage. If this supply voltage provided with a screw (29) (see Figure 11), for locking the falls excessively, the undervoltage release will provide for striker pin (23) in the normal position for adjusting pur-...

  • Page 15: Shock Absorber

    Interrupter/Operator Description Shock Absorber Type 3AH circuit breakers are equipped with a sealed, oil- filled, viscous damper, or shock absorber (61.8) Figure 6. The purpose of this shock absorber is to limit overtravel and rebound of the vacuum interrupter movable contacts during the conclusion of an opening operation.

  • Page 16: Maintenance

    Periodic inspections and maintenance are essential to ob- preventive maintenance program is not intended to cover tain safe and reliable operation of the 3AH circuit breaker. reconditioning or major repair, but should be designed to reveal, if possible, the need for such actions in time to prevent malfunctions during operation.

  • Page 17: Checks Of The Primary Power Path

    • Fastener check Cleanliness Check • Manual spring charging check Figure 2 is a side view of the 3AH circuit breaker with the • Contact erosion check insulating barriers removed (if furnished) to show the vacuum interrupter, and the upper and lower primary dis- •...

  • Page 18: Fastener Check

    Maintenance 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.

  • Page 19: Electrical Control Checks

    31.5kA 15kV 40kA 40kA Electrical Control Checks 15kV 50kA 50kA The electrical controls of the 3AH circuit breaker should be 27kV 25kA 25kA checked during inspections to verify absence of any me- 38kV 31.5kA 31.5kA chanical damage, and proper operation of the automatic spring charging and Close and Trip circuits.
  • Page 20 Maintenance Figure 15. Typical Vacuum Interrupter Contact Life Curves...

  • Page 21: Electrical Close And Trip Check

    Maintenance Electrical Close and Trip Check After checking the vacuum, reconnect the lever (48.6) to (Control Power Required) the insulated coupler (48). A check of the breaker control circuits is performed while High-Potential Tests the unit is still connected to the switchgear by the plug The next series of tests (Vacuum Integrity Test and Insula- jumper.

  • Page 22: Vacuum Integrity Test Procedure

    Maintenance Figure 16. 3AH Pole Assembly / Vacuum Check Mechanical / Contact Resistance Test the insulated drive links, as well as the insulating (tension) Note: Do not use DC high potential testers struts between the upper and lower vacuum interrupter incorporating half-wave rectification.

  • Page 23: Insulation And Contact Resistance Test Procedure

    Maintenance Insulation and Contact Resistance Test Procedure Inspection and Cleaning of Breaker Insulation 1. Observe safety precaution listed in the danger and cau- 1. Perform the Spring Discharge Check on the circuit tion advisories for the Vacuum Integrity Check tests. breaker after all control power is removed.

  • Page 24: Overhaul

    They have been completely tested and dielectrically and mechanically conditioned. Circuit Breaker Overhaul Table 6 lists the recommended overhaul schedule for 3AH It is recommended that one interrupter be removed and circuit breakers operating under ANSI usual conditions. replaced completely rather than removing two or more When actual operating conditions are more severe, over- interrupters at a time.
  • Page 25 Overhaul 1.5 Free struts (28) from the upper pole support (20). 2. Installing an Interrupter Loosen the strut hardware on the lower support (40) and swing the struts forward and downward. NOTE: Replacement interrupter (30) will be received from the factory with an eyebolt (36.3) in place, ad- 1.6 Loosen screws fastening the centering ring (28.1).

  • Page 26: Hydraulic Shock Absorber

    (48.5). Apply retaining clips. Hydraulic Shock Absorber Correct pin has ends which have been generously The 3AH mechanism is equipped with hydraulic shock ab- chamfered. sorber and a stop bar that functions when the breaker opens. See item 61.8, (Figure 6). The shock absorber 2.12 Open and close breaker several times and then...
  • Page 27 Maintenance and Troubleshooting Table 7. Periodic Maintenance and Lubrication Tasks Inspect For Sub-Assembly Item Primary Power Path Vacuum Interrupter 1. Cleanliness 2. Contact erosion. Note: Perform with Manual Spring Checks 3. Vacuum integrity. Note: Perform with High Potential Tests Vacuum Interrupter 1.

  • Page 28: Maintenance And Troubleshooting

    Maintenance and Troubleshooting Table 8. Troubleshooting Problem Possible Causes and Remedies Symptoms Breaker fails to close Closing springs will not 1. Secondary control circuit is de- automatically charge energized or control circuit fuses are blown. Check and energize or replace if necessary 2.
  • Page 29 Maintenance and Troubleshooting Table 9. Troubleshooting (continued) Problem Possible Causes and Remedies Symptoms Nuisance or false close Electrical problem 1. Nuisance or false closing signal to secondary disconnect contact 13. Check relay logic. Correct as required. 2. Closing coil (52SRC) terminal A2 is shorted to ground.
  • Page 30 Appendix Table A-1a Type 3AH Circuit Breaker Ratings (Historic “Constant MVA” Rating Basis) These ratings are in accordance with the following standards: ANSI C37.04-1979 Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis ANSI C37.06-1987 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis- Preferred Ratings and Related Required Capabilities ANSI C37.09-1979...

  • Page 31: Appendix

    Appendix Table A-1b Type 3AH Circuit Breaker Ratings (New “Constant kA” Rating Basis) ANSI C37.04-1999 Standard Rating Structure for AC High-Voltage Circuit Breakers ANSI C37.06-2000 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis- Preferred Ratings and Related Required Capabilities ANSI C37.09-1999...
  • Page 32 Appendix Table A-2 Type 3AH Circuit Breaker Ratings Control Voltages, ANSI C37.06 Spring Charging Motor Nominal Close Coil Trip Coil Charging Range Amperes Close Trip Amperes Amperes Run (Avg.) Seconds 48 VDC 36-56 28-56 125 VDC 100-140 70-140 250 VDC...
  • Page 33 Siemens Power Transmission & Distribution, Inc. P.O. Box 29503 Raleigh, NC 27626-0503 SGIM-9918 (9-2001) Printed in U.S.A. © 2001 Siemens Power Transmission & Distribution, Inc. SIEMENS is a registered trademark of Siemens AG.

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