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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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The design is to be catered for the most adverse of the environmental and electrical conditions. Vibration levels and methods of taking measurements are given in clause of specification NES The equipment must be designed so that the maximum permissible operating temperature of components is not exceeded during normal operating conditions in a maximum ambient temperature jds specified in this specification.

The distortion levels should be minimized where possible and distortion factor should not exceed 0. The test will comprise of: The power source may operate in a degraded mode on a continuous basis where the power characteristics supplied to the utilization equipment exceed normal operation limits but remain within the limits for abnormal operation.

Compare these energy changes 1 volt means 1 joule of energy per. Recommendations for insurance holding of long lead items are also to be indicated.

Over Voltage and Under Voltage. The equipment with PCBs in place will be switched on at room temperature for hours.

Following draft documents shall be presented for approval jxs Indian Navy. Control and Protection Any correction applied for different environmental and installation conditions shall be duly notified to concerned Naval Agencies, seeking their approval. The manufacturers shall submit approval and As made drawings sufficiently detailed to show the manner of construction and operation, the method of assembly and dismantling.


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The helo starting rectifier shall be provided with a remote starting panel along with following metering facility: The first rectifier of a new design is to be subjected to type test in accordance with clause of NES Utilization equipment is that equipment which receives power from the electric power system.

The frequency converter is to be brushless excitation type.

The product offered by the manufacturers should conform to Standard Engineering practices. Cable size Size i ii No. The equipment supplied shall be warranted from defects, manufacturer and performance for the said period and cover all the defects arising from malfunction through design faults, inappropriate material, bad production and non- conformance jsz specifications.

Radio interference suppression unit shall be incorporated as per specification BS to limit the interference to 5. Cable size Gland Size i 4 pair x 1 sq. Scope Page No 1 2. Over frequency and under frequency are those frequencies which js the transient limits for normal operation and are limited by the jse of protective devices.

Normal operation includes switching of utilization equipment, prime mover speed changes, synchronizing and paralleling of power sources. However the frequency converter set should be capable of withstanding the following overload capacity: An aircraft electric power system consists of a main power source, emergency power source, power conversion equipment, control and protection devices, and an hss network wires, cables, connector, etc.

In case of motor it is to be affixed on rear of the terminal cover of the motor.

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The equipment shall be provided with the following indications: The control panel shall be designed suitable for bulkhead mounting.


Standard specification and grade of material of each component used to be indicated in the binding drawings. A transient may also occur as a result of a momentary power interruption or an abnormal disturbance such as fault clearing.

In both the cases, the voltage must be restored to and remain within 0. The major machinery elements shall be subject to post tests inspections. Unless iss specified, means are to be provided in the output of jss equipment to prevent excessive voltage rise on o-load. Workmanship shall be of highest quality and to the entire satisfaction of the inspecting authority.

Emergency operation occurs following the loss of the main generating equipment when a limited electric source, independent of the main system, is used to power a hss complement of distribution and utilization equipment selected to maintain flight and personnel safety.

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Sources of voltage modulation may include, but are not limited to, voltage regulation stability of the AC power source, generator speed variations. Steady state frequency is the time average of the frequency over a period not to exceed one second.

Wave Form Harmonic Content. The voltage limits for normal operation may be exceeded during the following starting conditions: This statement of requirement covers the manufacturing, testing and onboard commissioning of the transformer rectifier unit required to provide