JSS 0251 PDF

JSS (Revision No. 1) CONTENTS Srl. No. Page No. Appendix ‘L’ Format and Cover Page of Design Specification and Packaging Specification. JSS (Revis 29 JSS (Revision No. 1 FORMAT AND CONTENTS OF PACKAGING SPECIFICATION CONTENTS. JSS Binding data, Design Drawings and Technical documentation. Binding Drawing. The manufacturers shall submit “as built” drawings.

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Following local and remote control indication facilities are to be provided: With 10 s period: Standstill anti condensation heater suitable for operation on V, 50 HZ, 1 Ph supply is to be fitted inside the rectifier to prevent condensation when the equipment is switched off.

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The rectifier shall be manufactured to the following specifications: All tallies and diagram plates shall be of anodized aluminium alloy. Nominal voltage restored within ms.

The POR shall be at the input terminals of the line contactor connecting the power system to the load bus. Voltage modulation is the variation of AC voltage during steady state AC electric system operation. Utilization equipment is that equipment which receives power from the electric power system. Short Circuit and Over current Protection The product offered by the manufacturers should conform to Standard Engineering practices.

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Over Voltage Protection Unit. The enclosure protection of various equipment shall be as follows: The AVR is to provide all the circuitry and tuning control necessary to ensure that the converter under control of AVR, meets all the steady state, transient, short circuit, trim range and output voltage adjustment.

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02551 assemblies are to be tested for end-to-end continuity and are to meet the following requirement when tested between sockets and earth: The generator AVR and OVPU are to be designed so that the voltage protection unit does not operate under any of the following conditions: Cable size Gland Size i 4 jas x 1 sq.

All tests required are to be carried out as specified in this specification.

Any user of this Specification may propose an amendment to it. The frequency converter set design is to permit ready removability of the item without undue disturbances to the system.

Utilization equipment terminals provide the interface with the electric power system. The manufacturer is required to provide the necessary representative s to assist in carrying out inspection and supervise the work that is done on the equipment, during the following phases: Though the starting current envelope are different for different helicopters, the starting rectifier will be tested for the helicopter starting current envelope as given below: All equipment jse do jsa affect the fighting capability of the ship, come under this category.

Cable size Gland Size i 6 ii iii 3 No.

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Further all the equipment be supplied with shock mounts. This statement of requirement covers the manufacturing, testing and onboard commissioning of the transformer rectifier unit required to provide The equipment shall be made from approved material as specified in the specification NES The frequency converter is to be brushless excitation type.

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The Ordering Authority should order for supply of all the associated units along with main equipment for installation and exploitation on board ship. The following general control design principles apply: A transient may also occur as a result of a momentary jse interruption or an abnormal disturbance such as fault clearing.

Scope Page No 1 2. Voltage modulation amplitude is the difference between the maximum and minimum AC voltage values that occur in a one second period during steady state operating conditions.

Closed loop voltage control is to be provided in the rectifier for controlling the rectifier output voltage characteristic within the specified limit. The voltage phase difference is the difference in electrical degrees between the fundamental components of any two phase voltages taken at consecutive zero crossings traced in the negative to positive direction.

The following documentation or the jsss issue in effect is to form a part of this specification to the extent specified herein, except where a specific issue is indicated. The following protection principles are to apply to all rectifiers: The converter shall be manufactured to deliver AC power of singlephase or three- phase wye- connected grounded js having a nominal Voltage of Volts having following characteristics: Over Voltage and under Voltage are those voltages which exceed the transient limits for normal operation and are limited by the action of protective devices.

Maximum output voltage drop and recovery period during load state.

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