This article is about SAES-T-887 which is about Telecommunications: Electrical Coordination Protection at Power Plants and Radio Stations and download SAES-T-887 PDF for telecommunication and electrical engineers, supervisors and project managers, telecom QCs, telecom QC Supervisors. This is saudi aramco standards of Telecommunication Engineering based on international codes and standards and useful for telecom and electronics engineering knowledge to get job as engineers, QC Supervisors and QC managers, Engineering managers and technicians.
SAES-T-887 PDF Download
SAES-T-887Telecommunications: Electrical Coordination Protection at Power Plants and Radio Stations
Design
The SAES-T-887 standard focuses on the electrical protection of telecommunications plant that serves or is in proximity to power facilities and communications radio stations. It establishes mandatory requirements to ensure the safety and proper functioning of the telecommunications infrastructure in these environments. Here are some key points related to the design requirements:
- Protection Measures:
- The standard defines the necessary protection measures to safeguard the telecommunications plant from electrical hazards, including power disturbances, lightning strikes, electromagnetic interference, and grounding issues.
- Power Facility Proximity:
- When the telecommunications plant is located near power facilities, such as substations or power lines, specific protection measures need to be implemented to mitigate potential risks. These measures may include proper grounding, insulation coordination, surge protection, and separation distances.
- Radio Station Proximity:
- Similar to power facilities, when the telecommunications plant is in proximity to communications radio stations, the standard outlines protection requirements to address potential electromagnetic interference issues. Proper shielding, grounding, and filtering techniques may be employed to ensure the integrity of the telecommunications signals.
- Surge Protection:
- The standard emphasizes the importance of surge protection devices to safeguard the telecommunications plant against voltage surges and transient events. It provides guidelines for the selection, installation, and testing of surge protective devices to maintain the reliability of the system.
- Grounding and Bonding:
- Adequate grounding and bonding practices are essential for the protection of the telecommunications plant. The standard defines the requirements for grounding systems, bonding conductors, and interconnection between different systems to establish a safe and reliable electrical infrastructure.
- Compliance with Applicable Codes and Standards:
- The design of electrical protection in telecommunications plant should comply with relevant codes and standards, including national electrical codes, local regulations, and industry best practices. These codes and standards provide additional guidelines and requirements for electrical safety and protection.
It is crucial to refer to the complete SAES-T-887 standard for comprehensive details and specific design guidelines to ensure compliance and the appropriate electrical protection of telecommunications plant serving or in proximity to power facilities and communications radio stations.
Industry Codes and Standards for sAES-T-887
The SAES-T-887 standard for electrical protection of telecommunications plant serving or in proximity to power facilities and communications radio stations references several industry codes and standards to ensure compliance and best practices. Here are some of the industry codes and standards mentioned in the standard:
National Fire Protection Association (NFPA):
- NFPA 70: National Electrical Code (NEC)
- NFPA 78: National Fire Protection Association
Institute of Electrical and Electronics Engineers (IEEE):
- IEEE 81: Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System
- IEEE 487: Guide for the Protection of Wire Line Communication Facilities Serving Electric Power Stations
Underwriters Laboratories, Inc. (UL):
- UL 497: Protectors for Paired Conductor Communication Circuits
- UL 497A: Secondary Protectors for Communication Circuits
- UL 497B: Protectors for Data Communication and Fire Alarm Circuits
These industry codes and standards provide guidelines and requirements for electrical protection, grounding, and communication circuit protection. By incorporating these recognized standards into SAES-T-887, the standard ensures that the electrical protection of telecommunications plant meets industry best practices and safety standards.
Design
Based on the provided information, here are the mandatory requirements for the design of telecommunications protection:
4.1 Electrical Protection Engineering Fundamentals:
- The goals of electrical protection include safeguarding life, property, and communication services.
- Telecommunication outside plant facilities should be protected from foreign voltages, such as lightning, accidental contact with light or power lines of 300 volts or more, voltages electromagnetically induced into communication lines by fault currents in paralleling power lines, voltages electrostatically induced into communication lines by normal currents in paralleling power lines, and ground potential rises due to the flow of lightning or power fault currents.
4.1.2 Ground Potential Rise (GPR):
- When a communication facility with metallic members is within 1.0 km of a power facility, a GPR analysis must be conducted.
- Based on the calculated GPR voltages, appropriate protection devices and grounding should be incorporated into the design of the communications facility.
- The cable design or location should ensure that the GPR exposure does not exceed 50% of the cable core-to-sheath dielectric rating.
- GPR calculations, grounding, and recommended protection equipment should be provided as part of the project design package.
- If there is uncertainty regarding the provided design, interpretations can be provided through the Saudi Aramco Communications Standard Committee Chairman.
- A copy of the GPR analysis should be included in the design package.
4.2 Protection Design of Communication Facilities Serving Electric Power Stations:
- Minimum protection requirements at power stations are indicated in Table 1.
- Safeguards should be provided for Class “A” or Class “B” service circuits, ensuring physical protection and identification throughout the installation.
- The services should be clearly identified and safeguarded, including providing physical protection and identification at every point in the cable distribution system where the conductors appear outside the cable sheath.
- Materials and supplies used for safeguarding these services should be red in color and include cable warning tags, labels, stenciling in red ink or red paint, binding post caps, plastic separators on connector blocks, etc.
These mandatory requirements aim to protect telecommunication outside plant facilities from foreign voltages and ensure the appropriate design and protection measures are implemented, including GPR analysis, grounding, and physical safeguards for communication facilities serving electric power stations.
FAQs about SAES-T-887 PDF Download
Q1: What are the goals of electrical protection in telecommunication outside plant facilities?
A1: The goals of electrical protection include safeguarding life, property, and communication services.
Q2: What are the foreign voltages that telecommunication outside plant facilities need protection from?
A2: The facilities need protection from various foreign voltages, such as lightning, accidental contact with light or power lines of 300 volts or more, electromagnetically induced voltages from fault currents in paralleling power lines, electrostatically induced voltages from normal currents in paralleling power lines, and ground potential rises due to the flow of lightning or power fault currents.
Q3: What is Ground Potential Rise (GPR) and when should a GPR analysis be conducted?
A3: GPR refers to the increase in ground potential caused by lightning or power fault currents. A GPR analysis should be done when a communications facility with metallic members is within 1.0 km of a power facility. The analysis helps determine the appropriate protection devices and grounding measures to be incorporated in the design to limit GPR exposure.
Q4: What are the minimum protection requirements for communication facilities serving electric power stations?
A4: The minimum protection requirements are outlined in Table 1 of the standard, which provides specific guidelines for different types of protection.
Q5: How should pair identification and physical safeguards be implemented for Class “A” or Class “B” service circuits?
A5: Physical safeguards and identification should be provided at various points in the cable distribution system where the conductors appear outside the cable sheath. This includes using red-colored materials and supplies for protection, such as cable warning tags, labels, stenciling in red ink or paint, binding post caps, plastic separators on connector blocks, etc.
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