6. Requirements to electromagnetic compatibility of shs acs tp

SHS ACS TP shall operate in certain electromagnetic environment, not inducing unacceptable radio frequency interference to other hardware components.

Selection of the SHS devices during design of the ACS TP SS shall be carried out with the account taken of electromagnetic environment at places of their installation.

The ACS TP SHS devices shall maintain operability in radiated emission fields in accordance with the level of electromagnetic compatibility specified in SHS operating documentation.

The ACS TP SHS devices shall be tested on resistance to electromagnetic interference in accordance with IEC 61000-4 “Interference immunity tests. General Requirements”. For individual types of tests (in a greater detail) there are publications IEC 610004, IEC 255.

If the field density in the place of envisaged SHS installation exceeds the permissible value, it is required to perform mechanical and electrical calculations for determining location of positioning the equipment, and measures shall be taken to control the limiting values of susceptibility by means of cable core screening and earthing method.

7. Requirement to reliability of the acs tp software/hardware

Generally, reliability of the control system shall meet requirements of ІЕС 870-4-93, ГОСТ 27.003-90, ГОСТ 24.701-86

Required reliability of delivered hardware should be ensured by selecting the appropriate components base, methods and tools for software and hardware redundancy.

In case of failure of individual components of modules of the system should preserve the essential function of the system through their respective reservation or other modules.

The failure of any element of ACS TP in no case should not lead to the issuance of false commands (control)

The ACS TP equipment must meet the requirements for noise immunity to high-voltage, high-frequency and pulse interference in accordance with IEC 255 Publication 5.

A method for performing and mode of operation of electrical circuits from the sensor measured values to the device providing the input information in ACS TP should exclude interference; leading to a distortion of the information (the sensors must be electrically isolated from the equipment).

In case of failure and recovery of power the ACS TP equipment should not give false commands. And this software and hardware systems should provide an automatic restart of the individual components or the entire system when the power is restored. Short-term and long-term power loss on the automatic direct current shall not lead to irreversible consequences for system as a whole, and/or for individual subsystems.

The probability of failure-free operation of the system should not be worse:

0,99 – function of operational management;

0,999 – function of automatic control;

and it must be confirmed by the relevant calculation reliability.

8. Requirement to Safety

Requirements to SHS safety shall comply with requirement of Chapter 2 of GOST 24.104-85, as well as of Safety at Work regulations.

Hardware of the ACS TP SHS by method of protecting a man from electric shock is related to Class 1 and shall be manufactured according to GOST 12.2.007.0-75.

Safety earthing shall be implemented at all SHS hardware in accordance with requirements of GOST 12.2.007.0-75, GOST 25861-83 and PUE (electrical installation code) (TN-S).

Design and positioning of SHS racks (cabinets) shall meet requirements of electrical and fire safety in accordance with PTE (operational regulations), GOST 12.2.003-91. SSBT (occupational safety standards system), and GOST 12.2.007.6-93. Cable products employed in manufacturing of the communication cable lines shall have reliable protection against mechanical damage and be self-extinguishing. At personnel WS and service rooms accommodating the ACS TP equipment, it is required to limit unsafe and harmful occupational factors.