DID ISC12/12

SECTION 26 36 23

AUTOMATIC TRANSFER SWITCHES BY PASS

PART 1 – GENERAL

1.01SUMMARY

  1. This section includes automatic transfer switches by pass equipment.

1.02SUBMITTALS

  1. Product data: Include rated capacities, weights, operating characteristics, furnished specialties and accessories.
  2. Shop drawings: Dimensioned plans, elevations, sections, conductor entry provisions, installed features and devices and material lists for each switch specified.
  3. Field quality control test reports.
  4. Operation and maintenance data specified by the manufacturer.
  5. Product certificates : Signed by manufacturer certifying that products furnished comply with requirements mentioned.

1.03QUALITY ASSURANCE

  1. Comply with IEC 60947-6-1 _ Low-voltage switchgear and control gear - Multiple function equipment – Transfer switching equipment
  2. Comply with IEC 60947-3 _ Low-voltage switchgear and control gear – Switches, disconnectors, switch-disconnectors and fuse-combination units
  3. Comply with IEC 61439 _ Low-voltage switchgear and controlgear assemblies
  4. Original manufacturer of automatic transfer switches by pass equipment shall have the capacity to design, assemble, manufacture and fully test the equipments.
  5. The manufacturer shall be certified ISO 9001 : 2008 International Quality Standard and the manufacturer shall have third party certification verifying its quality assurance in design and production in accordance with ISO 9001.

PART 2 – PRODUCTS MANUFACTURERS

2.01MANUFACTURERS

  1. Manufacturers: Subject to compliance with requirements, provide products by one of the following :
  1. Automatic Transfer Switches by pass equipment:
  1. Socomec ATySBy-Pass.
  2. …..

2.02AUTOMATIC TRANSFERSWITCH EQUIPMENT REQUIREMENTS

  1. GENERAL:
  1. The ATSE shall conform to the requirements of IEC60947-6-1 for the transfer switching equipment and 60947-3 for switches and disconnector.
  2. The ATSE shall be composed of two separate load break switches, a mechanism to operate and mechanically interlock the switches, an actuator and a 3 phase monitoring device and control module (MDCM).
  3. The ATSE shall be fully integrated in one device. No additional wiring else than the power connection and voltage sensing shall be needed to allow the proper functioning of the ATSE with the MDCM.
  1. RATINGS, TESTS:
  1. Ratings:
  1. Phase, voltage, ampere rating, number of poles, withstand rating shall be as shown on the drawings. The ampere rating shall be for 100 percent continuous load current and phase and neutral to be same rating.
  2. Ratings shall be with non-welding of contacts during the performance of withstand and closing tests.
  1. Tests:
  1. The complete ATSE shall be factory tested to ensure proper operation of the individual components together and correct overall sequence of operations. The test must also ensure that the operating transfer time, voltage, frequency and time delay settings are incompliance with the specification requirements.
  1. DESIGN REQUIREMENTS:
  1. The ATSE shall have 3 stables positions: I, O and II.
  2. The ATSE shall be of disconnector type with fully visualized breaking.
  3. The ATSE shall be electrically operated and mechanically held.
  4. The switches shall be inherently mechanically interlocked.
  5. The electrical actuator shall be a motorized unit.
  6. The ATSE shall incorporate a position indicator for the 3 stable positions.
  7. The ATSE shall have a manual and automatic mode.
  8. The neutral pole of ATSE shall be fully rated.
  9. The ATSE shall be no power consumption while in a stable position other than the one required for the control unit.
  10. The poles shall switch simultaneously with a time gap of less than 1 mS to avoid any floating neutral issue during switching ON or OFF.
  11. ATSE electrical features must withstand a rated insulation voltage (Ui) up to 1000V, an impulse voltage (Uimp) up to 12 kV and an operational voltage up to 690 Vac
  1. SAFETY REQUIREMENTS & FEATURES:
  1. It shall not be possible to connect the position I to the position II in case of any failure of the equipment.
  2. Opening and closing operations of the contacts must be independent from the handle movement and speed.
  3. In case of contacts welding, the ATSE must remain in its position.
  4. The ATSE shall have a built-in provision for padlocking in the O position. One padlock only shall be necessary, up to three can be mounted on the same ATSE.
  5. Electrical and manual commands shall be inhibited when the product is padlocked.
  6. The padlocking shall be possible only in manual position.Automatic commands are inhibited when padlocked.
  7. A handle shall be provided for manual operation.
  8. It shall be possible to block the re-transfer process via programming.
  1. OPERATIONS:
  1. Manual transfer shall be possible on load, without any upstream disconnection.
  2. The ATSE shall be supplied by any present source.
  3. The ATSE shall have a high short time current withstand capability (Icw 1s).
  4. Manual retransfer function can be inhibited and must be possible either locally or from remotely.
  5. The ATSE shall have the possibility to be electrically controlled in any of the 3 positions by mean of dry contacts.
  1. AUTOMATIC OPERATION VIA THE MDCM
  1. For critical applications, a monitoring device and control module (MDCM) shall be integrated within the ATSE. In that case the MDCM shall comply with the following standards:.
  • EN 55022 Conductor Emission
  • EN 55022 Radiated Emission
  • EN 61000-4-2 Electrostatic Discharge (ESD)
  • EN 61000-4-3 Radiated electromagnetic field
  • EN 61000-4-4 Electrical fast transient (EFT)
  • EN 61000-4-5 Surges
  • EN 61000-4-6 Conducted radio frequency field
  • EN 61000-4-8 Power frequency magnetic field
  • EN 61000-4-11 Voltage dips, short interruptions and variations
  • EN 61000-4-13 Harmonics and inter harmonics
  1. The monitoring device and control module (MDCM) must be integrated within the ATSE.
  2. Electrical control of the product position (I, O, II) must be possible locally or remotely.
  3. Parameters:
  1. The MDCM shall includes 3 phases sensing for the monitoring of voltage and frequency.
  2. Voltage settings shall be field adjustable in 1% increments.
  3. Frequency settings shall be field adjustable in 0.1% increments.
  4. All settings shall be adjustable directly from the front face.
  5. The MDCM shall have a phase sequence detection.
  6. The MDCM shall have programming for selection of network type.
  7. The MDCM shall allow the setting of the sources priority.
  1. Interface:
  1. The MDCM must be easily configurable via a HMI dialogue interface.
  2. Source status shall be clearly visible on the front of the unit.
  1. Inputs/outputs, communication:
  1. The MDCM shall be able to provide up to four Inputs and four outputs.
  2. Plug-in optional module: It should be possible to mount an optional communication module to control and state feedback of the ATS via 2 or 3 wire RS 485 link with JBus/Modbus protocol and transmission speed up to 38,400 baud.
  1. Timers settings:
  1. An adjustable timer of 0 to 60 seconds shall be provided to detect the priority network failure, to override any transient outages of the normal supply. (Main Failure Timer, MFT).
  2. A timer of 0 to 60 seconds shall be provided to validate the stability of emergency network before transfer, once the Generator Set supply is available. (Delay To Transfer, DTT).
  3. While transferring to emergency, a possibility to stay in position 0 shall be provided from 0 to 20 seconds (O Main Failure timer, 0MF).
  4. An adjustable timer of 0 to 30 minutes shall be provided to detect priority network return to normal, to override any false availability of the normal supply. (Main Return Timer, MRT).
  5. While transferring back to primary source, a possibility to stay in position 0 shall be provided from 0 to 20 seconds (O Main Return timer, 0MR).
  6. An adjustable timer of 0 to 30 minutes shall be provided to allow the generator cooling down after load retransfer from standby source to Mains source (Cool Down Timer, CDT).
  1. MAINTENANCE
  1. The ATSE shall proved the possibility to run a test ON load an OFF load.
  2. The ATSE shall not require any maintenance operation by the manufacturer once installed on site.
  3. Replacement of the electrical parts (motorization or controller) shall be possible without disconnection of the changeover switch.
  4. The replacement of the motor operated actuator shall be possible under voltage.

2.03BY PASS / ISOLATION SWITCHES

  1. GENERAL:
  1. The ATSE shall have an option By-Pass (BP).
  1. DESIGN REQUIREMENTS:
  1. By-Pass ATSE equipment shall be divided in proper functional compartments: the Automatic Transfer Switch Equipment (ATSE), the Manual Transfer Switch Equipment (MTSE) and the Load Break Switch (LBS).
  2. Each functional units of the By-Pass shall be individually operable in order.
  3. By-Pass shall be fully integrated in one enclosure, no additional wiring else than the power connection shall be needed.
  4. The By-Pass shall allow a complete removal in safe conditions of the ATSE in any position with a maximum of 2 operations, without interrupting the equipment or any other device upstream and downstream in the installation.
  5. By-passing of the ATSE shall be possible with the ATSE in any position, without having to change the ATSE position.
  6. 3 handles shall allow the following functions independently:
  7. Source selection
  8. Transfer to By-Pass
  9. ATSE disconnection
  10. The By-Pass shall have the possibility to have a direct handles or external handles, door mounted.
  11. The degree of protection shall be IP 42 defined in compliance with standard IEC60529.
  12. The low-voltage electrical switchboards:
  13. - shall enable low-voltage switchgear and controlgear assemblies up to 1000 V AC;
  14. - shall have a rated insulation voltage of 800 V AC
  15. - shall have a rated operational voltage of 690 VAC
  16. The low-voltage electrical switchboards shall comply with standard IEC60068.2.30 (hot and damp climates) and with standard IEC60068.2.11 (salt mist).
  17. The low-voltage electrical switchboards shall be compatible with all system earthing arrangements defined in standard IEC60984 (IT, TT or TN).
  18. Provisions must be made, around the equipment critical zones, for visual/infrared inspection during equipment operation.
  1. CONSTRUCTION
  1. The compartments shall be located inside a metal enclosure with walls providing protection against direct contact with live parts and guaranteeing a degree of protection IP 2X.
  2. The frame, the external panels (doors, side and rear panels, tops) and internal elements (ducts) shall be made of 2 mm thick steel sheet metal and protected by an epoxy-paint coating.
  3. The switchboards shall be suitable for installation side by side and back to back and capable of receiving lateral bottom entry ducts for busbars, cables and terminals.
  4. The switchboard cover panels shall be removable.
  5. It shall be possible to position switchboards back to back.
  1. OPERATION:
  1. 3 modes shall be available for full exploitation of the By-Pass ATSE equipment : ‘Normal’, ‘By-Pass’ and ‘Test’.
  2. The By-Pass shall allow a selection of the sources before of after by-passing the ATSE.
  3. The By-Pass ATSE equipment shall have a high short time current withstand capability (Icw 1s).
  1. AUTOMATIC OPERATION VIA THE MDCM
  1. All settings of the By-Pass ATSE equipment shall be adjustable through a remote display available on the front panel.
  1. SAFETY REQUIREMENTS:
  1. The By-Pass panel shall be a fully type tested assembly, equipped with copper busbarscomplying with IEC 61439-1.
  2. The By-Pass shall allow a selection of the sources before or after by-passing the ATSE.
  3. Each external handle shall allow the opening of the door only if the corresponding switch is OFF.
  4. In case of external handle, it shall be possible to open the door without switching off the equipment by mean of a defeater. The defeater must be activated only with a tool (i.e.: screw driver).
  5. power and control circuits shall be separate and completely isolated;
  6. auxiliary circuits shall be of the extra-low voltage type
  1. MAINTENANCE
  1. Switches part of the By-Pass ATSE equipment shall be maintenance free

PART 3 – EXECUTION

3.01INSTALLATION

  1. Preparation shall be in accordance with reviewed product data, final shop drawing and manufacturer’s recommendations.
  2. Installation shall be in accordance with manufacturer’s instructions.
  3. Identify components according to Division 26 section “Identification for Electrical Systems”.

3.02CONNECTION

  1. Connect wiring shall be in accordance with manufacturer’s instructions.
  2. Connect wiring according to Division 26 section “low-Voltage Electrical Power Conductors and cables”.

3.03MAINTENANCE & TRAINING

  1. Operation and Maintenance Instruction: Personnel shall also be formally trained by the manufacturer’s authorized representative as to the proper operation and maintenance of the automatic transfer switches equipment.

3.04TESTING

  1. The ATSE shall be declared conform to the IEC standards by a testing laboratory having the CBTL qualification (Certification Body Testing Laboratory) delivered by a National Certification Body under the IEC Electrotechnical Equipment (IECEE) certification body scheme.
  2. After installing equipment, execute test reports in accordance with manufacturer’s instructions.

END OF SECTION 26 36 23