Guidelines for Development Near Overhead Transmission Lines in BC

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Glossary (continued) Field Strength The strength of an electric field, measured in volts per metre or of a magnetic field measured in gauss. Hazard Trees A tree which is defective, has a “target” (where it is likely to hit or damage a person or object when it fails), and has the imminent potential to fail. Legal Survey Requires a field survey and preparation of a plan by a registered certified British Columbia Land Surveyor. Reliability With regards to an electric power system, the degree to which the performance of the elements of that system results in power being delivered to consumers within accepted standards and in the amount desired. A measure of the continuity of electric service over a long period of time. Right-of-Way (ROW) A term to describe limited interests in land which provide the right to utilize the property, for specific purpose(s), without having full ownership. Limited interests are defined by statutory rights-of-way, lease, licence, permit or letter agreements. Rights for Access Construction or Permanent Access A right granted to enter onto lands outside the statutory right-of-way for the purpose of construction or maintenance of a utility’s works. Generally, access to towers, poles, guys, etc. is obtained along the statutory right-of-way. However, in situations where an alternate access is required across vacant Crown land or private property, temporary during construction and permanent rights for maintenance are obtained through a separate agreement. System Security The ability of the bulk power electric system to withstand sudden disturbances such as electric short circuits or unanticipated loss of system components. Statutory Right-of-Way A right belonging to a party to pass over the land of another. A statutory right-of-way is a right granted by statute to negotiate for easements without a dominant tenement. A limited interest in land is acquired which is registered in the Land Title Office against the fee simple title. The limited interests obtained through this form of agreement are defined within the right-of-way document. The owner of the property retains the rights and benefits or ownership. Statutory rights-ofway are used by utility companies, government agencies, Crown corporations and local governments for the purposes of constructing linear works such as highways, railways, pipelines, transmission lines, water and sewer lines. 30 Guidelines for Development Near Overhead Transmission Lines in BC
Glossary Glossary (continued) Step & Touch Potential A potential difference or voltage gradient set up in the ground as a result of a fault current. Persons walking would experience a voltage between their feet (step potential). Persons touching a grounded object with their hands would experience a voltage between their hands and feet (touch potential). Substations Transforming or switching stations to control the voltage and direction of electricity. They reduce the voltage to lower levels for distribution. Switching controls the direction of electricity and ensures fault protection. Transmission Circuits categorized 60 kV and above are referred to as transmission (e.g. 138 kV, 230 kV, 360 kV, 500 kV). Circuits operating at 60 kV are referred to as “subtransmission” and may supply bulk customers directly. In some areas of BC, the sub-transmission voltage is at 138 kV. 230 kV is the backbone of BC Hydro’s urban transmission system. Overhead lines are usually built on steel towers or steel poles, although wood poles are common in rural areas. 500 kV is the major bulk transmission voltage. Overhead lines for 500 kV are only built on steel towers. Underbuild When distribution circuits (
Page 1 and 2: Guidelines for Development Near Ove
Page 3 and 4: BC Transmission Corporation and BC
Page 5 and 6: BC Transmission Corporation and BC
Page 7 and 8: Characteristics of Transmission Tow
Page 9 and 10: Designing Around Power Lines Design
Page 11 and 12: Designing Around Power Lines Densit
Page 13 and 14: Designing Around Power Lines Alignm
Page 15 and 16: Designing Around Power Lines Alignm
Page 17 and 18: Designing Around Power Lines Landsc
Page 19 and 20: Designing Around Power Lines Commun
Page 21 and 22: Designing Around Power Lines Nature
Page 23 and 24: Public Safety and Rights-of-Way Use
Page 29: Glossary Glossary Agreement An act
Page 33 and 34: Frequently Asked Questions Frequent
Page 35 and 36: Sources & Acknowledgements Sources

Guidelines for Development Near Overhead Transmission Lines in BC

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