Toshiba HV6AS manual

Document: GF07Z301 Rev. 1 INSTRUCTION MANUAL INSTALLATION - OPERATION - MAINTENANCE HV6AS Vacuum Circuit Breakers – Fixed Type 4.8 & 7.2kV Voltage Classes APPLICABLE MODEL NUMBERS: (Manual Operation Types) HV6AS-U HV6AS-L (Motor Operation Types) HV6AS-MU HV6AS-ML Issued: 2/2000 Supercedes First Issue Dated 2/99.[...]

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INSTRUCTION MANUAL For the Installation, Operation and Maintenance of HV6AS Vacuum Circuit Breakers – Fixed Type 4.8 & 7.2kV Voltage Classes Never attempt to install, operate, maintain or dispose of this equipment until you have first read and understood all of the relevent product warnings and user directions that are contained in this Instr[...]

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SAFETY Page 1 IMPORTANT MESSAGES Read this manual and follow its instructions. Signal words such as DANGER, WARNING and CAUTION will be followed by important safety information that must be carefully reviewed. Indicates a situation which will result in death, serious injury, and severe property damage if you do not follow instructions. Means that y[...]

Page 2 SAFETY QUALIFIED OPERATORS ONLY Only qualified persons are to install, operate, or service this equipment according to all applicable codes and established safety practices. A qualified person must: 1) Carefully read the entire instruction manual. 2) Be skilled in the installation, construction or operation of the equipment and aware of the [...]

SAFETY Page 3 HAZARDOUS VOLTAGE will cause severe injury, death, fire, explosion and property damage. • Turn off and lock out Primary and Control Circuit Power before servicing. • Keep all panels and covers securely in place. • Never Defeat, Modify, or Bypass any Safety Interlocks • Qualified Operators only SAFETY ..........................[...]

Page 4 TABLE OF CONTENTS INTRODUCTION ............................................................................................................................... ....... 6 GENERAL DESCRIPTION ....................................................................................................................... 7 Components .....................[...]

TABLE OF CONTENTS Page 5 Inspection During Storage...................................................................................................... ..... 32 SPECIFICATIONS ............................................................................................................................... ... 33 Table 3. Ratings – Manual Operation [...]

Page 6 INTRODUCTION It is the intent of this manual to provide a guide for safely installing, operating and maintaining Toshiba vacuum circuit breakers. This manual consists of a section of general safety instructions and is marked throughout with warning symbols. Read this manual thoroughly before installation, operation and maintenance of this eq[...]

GENERAL DESCRIPTION Page 7 The Toshiba HV6AS vacuum circuit breakers described in this manual are suitable for use on systems of 4.8kV and 7.2kV voltage classes which require interrupting ratings of 16kA and 14kA respectively and a continuous current rating of 630A. The circuit breakers are intended for use in limited applications requiring small p[...]

Page 8 GENERAL DESCRIPTION SAFETY DEVICES Safety interlocks and guards are provided as an integral part of the equipment design. These devices are provided for safety to the operator. Never defeat, modify or bypass any safety devices, interlocks or operating mechanism. This would make the equipment unsafe. Fire, explosion, severe injury, death and [...]

RECEIVING, INSPECTION AND HANDLING Page 9 RECEIVING AND UNPACKING The circuit breaker units are subjected to factory production testing prior to being packed and shipped. ACCEPTANCE INSPECTION Confirm that the circuit breaker unit is complete, correct as specified and undamaged from shipment and handling. Upon receipt of the equipment, do the follo[...]

Page 10 RECEIVING, INSPECTION AND HANDLING HANDLING AND MOVING When handling and moving the circuit breaker, the techniques shown in this section may be used. Care and caution should be used when handling the circuit breaker units to avoid damage to the equipment and personal injury. Always keep the circuit breaker in a generally upright position. [...]

INSTALLATION Page 11 Do not install this equipment in areas where unusual service conditions exist. Using this equipment in other than usual service conditions can result in equipment failure. Toshiba HV6AS circuit breakers are intended for use in usual service conditions as defined in IEEE C37.20.2. The temperature of the cooling air (ambient air [...]

Page 12 INSTALLATION MOUNTING THE CIRCUIT BREAKER TO A PANEL The circuit breakers are designed to mount to a panel made from 11 ga. (.12 in.) thick steel. If the breaker must be mounted to a panel of different thickness, contact Toshiba. Panel cutout dimensions for the circuit breakers are given in Fig. 12. One cutout size is used for all breaker t[...]

INSTALLATION Page 13 Fig. 12 Panel Cutout Dimensions 10.71 0.38 RADIUS 4 PLACES 0.343 DIA 4 PLACES 0.25 0.25 0.25 0.25 8.03 Dimensions in Inches[...]

Page 14 INSTALLATION MOUNTING DIRECTLY TO A SHELF The shelf should be flat and level within ± 0.5 mm ( ± 0.02 in.). If there are any noticeable gaps between the breaker and the shelf, fill them in using flat washers as spacers. Check to make sure the breaker On-Off indicator shows OFF (green), then mount it by following the steps below: 1. Fasten[...]

INSTALLATION Page 15 MAIN CIRCUIT CABLE CONNECTIONS Cables which connect to the circuit breaker should be routed to avoid interference with sharp edges and moving parts. Minimum bending radius for the type of cable used should be observed. Power cables should be braced and/or laced to withstand short-circuit forces wherever such cables are unsuppor[...]

Page 16 INSTALLATION GROUND CONNECTIONS The circuit breaker must be grounded in accordance with the requirements of the National Electrical Code, Article 250 or applicable local standards. Proper grounding connections must be made to the circuit breaker before incoming power is applied. It is very important that the circuit breaker and its enclosur[...]

INSTALLATION Page 17 CONTROL CIRCUIT CONNECTIONS Control circuit wiring is connected to the terminal block on the top of the operating mechanism (Fig . 20 ). Connect control wires in accordance with the appropriate wiring diagram shown in Fig. 28 through Fig . 31 in the OPERATION section of this manual. On the U and MU type breakers, connections to[...]

Page 18 PRE-ENERGIZATION CHECK GENERAL BEFORE ENERGIZING THE CIRCUIT BREAKER for the first time, follow the procedure below to verify that the equipment is properly installed and functional. Hazardous Voltage. Turn off and lock out all primary and control circuit power sources prior to performing this pre-energization check. Do not operate this equ[...]

OPERATION Page 19 MANUAL OPERATION Powerful springs. Do not place your hands or any part of your body inside the circuit breaker while the indicators show CHARGED (yellow) or ON (red). To avoid damaging the mechanism, do not close the circuit breaker when the On-Off Indicator shows ON (red). MANUAL CLOSING (Motor-Operated MU and ML Types): 1. Check[...]

Page 20 OPERATION MANUAL CLOSING (Manual Spring-Operated U and L Types): 1. Check to make sure that the On-Off indicator shows OFF (green). 2. Turn the closing handle clockwise. The breaker will close (On-Off indicator changes to ON) after the handle is turned approximately 75 ° . NOTE If the handle is turned in small increments, the closing sprin[...]

OPERATION Page 21 Fig. 27 Electrical Operation Flow Chart for MU and ML Type Breakers Circuit Breaker Open Control Power Applied Motor Begins Operating Closing Springs Begin Charging Closing Springs Charged Motor Stops Closing Signal Given Motor Begins Operating Circuit Breaker Closes Auxiliary Relay Closes Anti-Pumping Circuit Completed Opening Si[...]

Page 22 OPERATION Fig. 28 125 VDC Control Circuit Sc hematic for U Type Circuit Breaker Fig. 29 125 VDC Control Circuit Sc hematic for L Type Circuit Breaker a3 a2 a1 b3 b2 b1 a6 b5 a4 a5 b6 b4 TC UV C 4 K 1 51 4 1 31 2 1 1 1 6 1 5 1 4 1 3 1 2 1 1 C04 N2 25 24 23 22 21 26 24 25 22 23 21 C04 C4 N2 K Termin al Layout ( As Vi ewed From Fron t of Circu[...]

OPERATION Page 23 Fig. 30 125 VDC Control Circuit Sc hematic for MU Type Circuit Breaker Fig. 31 125 VDC Control Circuit Sc hematic for ML Type Circuit Breaker a3 a2 a1 b3 b2 b1 a6 b5 a4 a5 b6 b4 TC UV C 4 K 1 5 1 4 1 3 1 21 1 1 61 51 41 3 1 21 1 C04 N2 25 24 23 22 21 26 24 25 22 23 21 C04 C4 N2 K Term inal Lay out (As Viewed Fr om Front of C ircui[...]

Page 24 OPERATION UNDERVOLTAGE TRIP All HV6AS fixed mounted circuit breakers are furnished with an undervoltage trip device. The undervoltage trip device operates to trip the circuit breaker OFF unless 120VAC control power is present at the terminals of relay UV. When the circuit breakers are shipped, the undervoltage trip device is defeated by a f[...]

MAINTENANCE Page 25 MAINTENANCE PROGRAM In order to ensure continued reliable and safe operation of the equipment, a program of periodic maintenance must be established. Operating and environmental conditions will usually dictate the frequency of inspection required. NFPA Publication 70B "Electrical Equipment Maintenance" may be used as a[...]

Page 26 MAINTENANCE RECOMMENDED INSPECTION AND MAINTENANCE TYPES NOTE: Refer to the SAFETY section of this manual for important information. A. Acceptance Inspection This inspection confirms that the circuit breaker unit is complete, correct as specified, and undamaged from shipment. The procedure for this inspection is outlined in the RECEIVING, I[...]

MAINTENANCE Page 27 Table 2 Check Points for Periodic Inspection Check Point Check Item Check Method Criteria Disposition Operating Mechanism Loose bolts, nuts or screws Tighten using screwdriver or wrench. Make sure all bolts, nuts and screws are tight. Tighten if loose. See Table 1 for tightening torques. Dust or foreign matter inside Visual insp[...]

Page 28 MAINTENANCE Table 2. Check Points for Inspection (cont’d) Check Point Check Item Check Method Criteria What to do Auxiliary Switch Terminals loose or disconnected Visual inspection. Tighten using a screwdriver. Make sure terminals are not loose or disconnected. Repair if disconnected. Tighten if loose. See Table 1 for tightening torques. [...]

MAINTENANCE Page 29 VACUUM CHECK A sufficient level of vacuum is necessary for proper performance of the vacuum interrupters. Although vacuum leaks are rare, the vacuum integrity should be checked periodically. The relationship between dielectric breakdown voltage of the contact gap and internal vacuum interrupter pressure has been found to be gene[...]

Page 30 MAINTENANCE CRITERIA: 1. If a current flow above 5 milliamperes is observed or if breakdown occurs, one or more of the interrupters has insufficient vacuum and must be replaced. Exception: If the current exceeds 5 milliamperes the first time the voltage is brought up, reduce the voltage to zero and increase it again. It may be necessary to [...]

DISPOSAL Page 31 DISPOSAL Contact your state environmental agency for details on disposal of electrical components and packaging in your particular area.[...]

STORAGE Page 32 STORAGE If the circuit breaker is to be stored for any length of time prior to installation, the following precautions should be taken: 1) The original packing should be restored, if possible. 2) Do not subject the equipment to moisture or sun rays. Store in cool, clean, and dry location. 3) Place a dust cover over the circuit break[...]

SPECIFICATIONS Page 33 Table 3 Circuit Breaker Ratings – Manual Operation HV6AS-U and HV6AS-L Types Rated Voltage kV, rms 7.2 4.8 Rated Low Frequency Withstand Voltage kV, rms 22 Impulse Withstand Voltage kV, crest 60 Rated Continuous Current A, rms 630 Rated Frequency Hz 50/60 Rated Short-Circuit Breaking Current kA, rms 14 16 Rated Short-Circui[...]

Page 34 WARRANTY AND LIMITATION OF LIABILITY Toshiba International Corporation ("Company") warrant s that all equipment and parts described herein will be free from defects in materials and workmanship. THIS WARRANTY WILL EXPIRE EIGHTEEN (18) MONTHS AFTER THE DATE ON WHICH SUCH EQUIPMENT AND PAR TS (EXCLUDING REPAIRED OR REPLACEMENT EQUIP[...]

TOSHIBA TOSHIBA INTERNATIONAL CORPORATION 13131 W. Little York Road, Houston, TX 77041, U.S.A. Tel: (713) 466-0277 Fax: (713) 466-8773[...]