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Type 38-3AH3 38 kV
vacuum circuit breaker
instruction manual
Installation operation maintenance E50001-F710-A238-V1-4A00
Answers for energy.
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Hazardous voltages and high speed moving parts. Will cause death, serious injury or property damage. Always de-energize and ground the equipment before maintenance. Read and understand this instruction manual before using equipment. Maintenance should be performed only by qualified personnel. The use of unauthorized parts in the repair of the equipment or tampering by unqualified personnel will result in dangerous conditions which will cause death, severe injury or equipment damage. Follo
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Table of contents Introduction 4 - 5 Note: These instructions do not purport to cover all details or variations in equipment, nor Receiving, handling and storage 6 - 8 to provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further Installation checks and functional tests 9 - 13 information be desired or should particular problems arise that are not covered sufficiently for the purchaser’s purposes, Vacuum interrupter/opera
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Introduction Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Always de-energize and ground the equipment before maintenance. Maintenance should be performed only by qualified personnel. The use of unauthorized parts in the repair of the equipment or by tampering by unqualified personnel will result in dangerous conditions that will cause death, severe injury or equipment damage. Follow all safety instructions contained herein. Introducti
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Introduction Field service operation and warranty issues Siemens can provide competent, well trained field service representatives to provide technical guidance and advisory assistance for the installation, overhaul, repair and maintenance of Siemens equipment, processes and systems. Contact regional service centers, sales offices or the factory for details, or telephone Siemens field service at +1 (800) 347-6659 or +1 (919) 365-2200 outside the U.S. For medium-voltage customer serv
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Receiving, handling and storage Heavy weight. Improper lifting or hoisting can result in death, serious injury or property damage. Obtain the services of a qualified rigger prior to hoisting the circuit breaker to assure adequate safety margins in the hoisting equipment and procedures to avoid damage. Introduction 1. When t he shipment arrives, note whether the equipment is properly This portion of the instruction manual protected from the elements. Note the covers the receiving, handl
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Receiving, handling and storage 4. Notify Siemens medium-voltage Note: Any determination as to whether the customer service immediately of any equipment was properly loaded or properly damage, at +1 (800) 347-6659 or prepared by shipper for over-the-road +1 (919) 365-2200 outside the U.S. travel cannot be made at the destination. Shipments are not released from the 5. Arrange for a carrier inspection of the factory without a clear bill of lading. damage immediately. Approved metho
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Receiving, handling and storage Storage procedure Manual spring-charging access port Manual close button 1. Whene ver possible, install the circuit breaker in its assigned switchgear enclosure for storage. Follow instructions contained in the type GM38 38 kV metal-clad switchgear instruction manual, E50001-F710- A236-V1-4A00. 2. When the circuit breaker needs to be placed on its pallet for storage, be sure the unit is securely bolted to the pallet CHARGED/DISCHARGED indicator and c
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Installation checks and functional tests Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Read instruction manuals, observe safety instructions and use qualified personnel. Introduction Spring-discharge check (refer to Figure 1: Type 38-3AH3 vacuum circuit This section provides a description of the breaker front panel controls on page 8) inspections, checks and tests to be performed on the circuit breaker prior to Perform the spring-disc
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Installation checks and functional tests Heavy weight. Can result in death, serious injury or property damage. Observe all handling instructions in this instruction manual to prevent tipping or dropping of equipment. Removal from cell in indoor switchgear Removal from cell in outdoor non-walk- if not on raised pad and Shelter-Clad in enclosures or for indoor switchgear outdoor switchgear installed on a raised pad After performing the spring discharge Removal of the circuit breaker from a non-
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Installation checks and functional tests Heavy weight. Can result in death, serious injury or property damage. Do not transport a circuit breaker using a lift truck with the lift truck in the raised position. Figure 2: Type 38-3AH3 vacuum circuit breaker racking 5. Mo ve the circuit-breaker release latch Racking crank engagement procedure (on the floor of the cell near the right A crank for racking the circuit breaker is side of the circuit breaker) to the left provided as a standard acc
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Installation checks and functional tests The suggested procedure to engage the Physical inspections racking mechanism is as follows: 1. Verify the rating of the circuit breaker is 1. The circuit breaker must be OPEN. (The compatible with both the system and racking shroud cannot be moved if the the switchgear. circuit breaker is CLOSED.) 2. P erform a visual-damage check. Clean 2. Hold t he socket-end of the crank in one the circuit breaker of all dust, dirt and hand and the crank
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Installation checks and functional tests Note: Secondary-disconnect terminals are Final mechanical inspections without numbered 1-16, from right to left. control power The automatic spring-charging features of 1. Mak e a final mechanical inspection of the circuit breaker must be checked. the circuit breaker. Verify the contacts Control power is required for automatic are in the OPEN position, and the spring-charging to take place. closing springs are DISCHARGED. 1. Open control-power c
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Vacuum interrupter/ operator Figure 8: Front view of type 38-3AH3 vacuum circuit breaker with front panel removed Gearbox Opening spring Secondary disconnect Push-to-close Closing spring Spring-charging Auxiliary motor behind switch limit switches CHARGED/ Close coil DISCHARGED Trip coil indicator Push-to-trip OPEN/CLOSED indicator Mechanism- Operations operated cell counter (MOC) switch operator Capacitor trip (optional) Jack shaft Closed circuit- Trip-free interlock Ground discon
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Vacuum interrupter/ operator Introduction The type 38-3AH3 vacuum circuit breaker is of drawout construction designed for use in medium-voltage, metal-clad Fixed contact-current connection switchgear. The 38-3AH3 circuit breaker Ceramic insulator conforms to the requirements of ANSI and IEEE standards, including C37.20.2, C37.04, C37.06, C37.09 and C37.010. A type 38-3AH3 vacuum circuit breaker Arc shield Fixed contact consists of three vacuum interrupters, a stored-energy operating mecha
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Vacuum interrupter/ operator There are three insulating push rods. Each push rod connects the movable contact of one of the vacuum interrupters to the jack shaft driven by the closing and tripping mechanism. Flexible connectors provide secure electrical connections between the movable contacts of each vacuum interrupter and its bottom-primary disconnect. Phase barriers Figure 11: Type 38-3AH3 vacuum circuit breaker with inter-phase and outer-phase barriers installed on page 17 is a re
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Vacuum interrupter/ operator The vacuum circuit breaker consists of two sub-assemblies. The "interrupter/operator" module is a unitized assembly of the three vacuum interrupters, primary insulators and operating mechanism. The second module, the "vehicle", is the supporting drawout-structure module for the operating mechanism. The vehicle provides primary-stud extensions, closed circuit-breaker racking interlocks, closing spring discharge feature and other requirements needed to ensur
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Vacuum interrupter/ operator Current-path assembly Refer to Figure 14: Type 38-3AH3 vacuum circuit breaker pole section on page 19. The current-path assembly consists of the upper terminal and pole support (20.0), the stationary contact (31.0) and the 53.0 moving contact (36.0), that is connected with the lower terminal (29.0) by terminal 55.0 54.0 clamp (29.2) and a flexible shunt (29.1). 58.0 59.0 Vacuum interrupter Refer to Figure 9: Vacuum interrupter cutaway view on page 15. The mo
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Vacuum interrupter/ operator Figure 14: Type 38-3AH3 vacuum circuit breaker pole section 20.0 16.0 60.0 16.0 - Insulator 20.0 - Pole head 27.0 - Upper-connection terminal 28.0 - Strut 28.1 - Centering ring 27.0 29.0 - Lower-connection terminal 31.2 29.1 - Flexible connector 29.2 - Terminal clamp 30.0 - Vacuum interrupter 31.0 - Stationary contact 31.2 - Upper-terminal bolt 34.0 - Bellows (not shown) 30.0 31.0 35.0 - Guide bushing (not shown) 36.0 36.0 - Moving contact 28.0 36.3 - Eye bolt 40.0 -
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Vacuum interrupter/ operator Figure 15: Stored-energy operating mechanism 55.2 50.3 50.3.1 62.3 62.6 62.5 62.5.2 62.2 50.2 68.0 50.1 53.0 55.1 62.0 53.1 54.1 50.4.1 55.0 54.0 64.2 50.4 68.1 58.0 63.7 59.0 63.1 60.0 61.8 64.0 63.5 62.8 64.3 64.3.1 63.0 50.1 - Manual-spring charging port 55.0 - Spring-charge indicator 62.6 - Driver lever 50.2 - Charging-mechanism gear box 55.1 - Linkage 62.8 - Trip-free coupling rod 50.3 - Charging flange 55.2 - Control lever 63.0 - Jac
