Glossary
| ACCR | Aluminium Conductor Composite Reinforced |
| ACRE | Area, Corridor, Route, Easement (methodology) |
| AIL | Agricultural Investments Limited |
| AIS | Air-Insulated Switchgear. A high-voltage substation using atmospheric air as the main source of insulation |
| Alzheimer’s disease | a disease of the brain, which is the most common form of dementia |
| amyotrophic lateral sclerosis (Lou Gehrig’s disease) | a degenerative disease of the motor neurons, the nerve cells that control voluntary muscle movement |
| ARI-PAK A line | Arapuni-Pakuranga A double-circuit 110-kV line |
| ARPS | Auckland Regional Policy Statement |
| AS/NZS | Australian Standard / New Zealand Standard |
| bias | any trend in the collection, analysis, interpretation, publication or review of data that can lead to false conclusions |
| CAA | Civil Aviation Authority of New Zealand |
| carcinogen | a cancer-causing agent |
| case control study | an observational study which compares past exposure to factors of interest of people with a particular disease (cases) to generally similar people who do not have the disease (controls) |
| CHHL | Carter Holt Harvey Limited |
| CHL | Camperdown Holdings Limited |
| CMA | Coastal Marine Area (section 2 RMA) |
| CMP | Construction Management Plan |
| cohort study | an observational study which compares health outcomes in two or more similar groups with different exposure to a factor of interest |
| confounding | distortion in the estimate of effect due to the effect of an extraneous factor. For example, two occupational groups may have different lung cancer death rates because the proportion of cigarette smokers is much higher in one group than the other. |
| COPTTM | Code of Practice for Temporary Traffic Management |
| corona (corona discharge) | a low-energy plasma produced by the ionisation of nitrogen and oxygen in the air by the electric field at the surface of conductors of a high-voltage transmission line. It can produce audible noise and radio interference, and results in a small loss of the energy being transported by the transmission line |
| DDL | Drummond Dairy Limited |
| duplex | two conductors per phase bundle in an overhead transmission line or underground cable |
| duplexing | the replacement of a single conductor with two conductors per phase bundle |
| earthwire | a wire to bond all the structures together and protect the conductors from lightning strikes |
| EHV | Extra High Voltage |
| electric field (EF) | is present in proximity of charged conductors. It occurs whether or not there is current flowing in the conductors |
| ELF EMF | extremely low-frequency electric and magnetic fields |
| EMF | electric and magnetic fields. These are intrinsic attributes of any physical electrical system comprising conductors with voltages and currents. Sometimes known as electromagnetic fields |
| epidemiology | the study of the distribution and determinants of disease in populations |
| GIT | Grid Investment Test |
| GIS | gas-insulated switchgear. Metal-enclosed switchgear in which the insulation and arc extinction is obtained by an insulating gas, usually sulphur hexafluoride (SF6). GIS has no electrical conductors exposed to the atmosphere, except at the points where overhead transmission lines are connected to it. (The usual meaning of the acronym: Geographic Information System does not apply in this report.) |
| GPS | Government Policy Statement (The usual meaning of the acronym: Global Positioning System does not apply in this report.) |
| GRS | Grid Reliability Standards |
| haematological | relating to haematology, the branch of medicine which studies blood and blood-forming tissues |
| HFML | Hancock Forest Management (NZ) Limited |
| HGMPA | Hauraki Gulf Marine Park Act 2000 |
| HPVRA | Hunua and Paparimu Valley Residents’ Association |
| HVAC | High-voltage, alternating-current (line) |
| HVDC | High-voltage, direct-current (line) |
| IARC | International Agency for Research on Cancer |
| ICAO | International Civil Aviation Organisation |
| ICNIRP | International Commission on Non-Ionising Radiation Protection |
| IEEE | Institute of Electrical and Electronic Engineers |
| in vitro | studies undertaken in a controlled environment outside of a living organism or cell |
| kV | kilovolt: one thousand volts |
| LFL | Lichfield Farms Limited |
| leukaemia | cancers of the blood or bone marrow characterised by an abnormal proliferation of typically white blood cells. In children the most common type is acute lymphoblastic leukaemia |
| melanoma | a malignant tumour most commonly arising in the skin |
| meta-analysis | a structured systematic integration of data or results from different epidemiological studies of the same problem |
| MF | magnetic field. The force experienced in a region of space around a current carrying conductor. It is measured in amperes per metre (A/m). The density of this field is often expressed in the unit microtesla (μT) |
| MRP | Mighty River Power Limited |
| MVA | Megavolt-ampere. A measure of the capacity of electrical equipment, or the level of power that is being generated, transmitted or used by the equipment |
| MVAr | megavolt-ampere reactive. A measure of the reactive capacity of electrical equipment, or the level of reactive power that is being generated, transmitted or used by the equipment |
| MW | megawatt. A measure of the useful capacity of electrical equipment, or the level of useful power that is being generated, transmitted or used by the equipment |
| NPS | National Policy Statement |
| NZCPS | New Zealand Coastal Policy Statement |
| NZEECS | New Zealand Energy Efficiency and Conservation Strategy |
| NZES | New Zealand Energy Strategy |
| NZHPT | New Zealand Historic Places Trust |
| NZS | New Zealand Standard |
| NZTA | New Zealand Transport Agency |
| OLS | Obstacle Limitation Surfaces |
| ONL 62 | Outstanding Natural Landscape no. 62 |
| osteosarcoma | a malignant tumour of bone |
| OTA-WKM A, B and C lines | Otahuhu-Whakamaru A, B and C double-circuit 110-kV lines |
| pooled analysis | analysis of combined original data from different epidemiological studies of the same problem; a type of meta-analysis |
| RMA | Resource Management Act 1991 |
| RPS | Regional Policy Statement |
| SDL | Scenic Dairy Limited |
| simplex | a phase consisting of a single conductor per phase |
| SLCA | Special Landscape Character Areas |
| SOO | Statement of Opportunities |
| stray voltage | unwanted voltage occurring in equipment. In a domestic, commercial or industrial situation this is usually due to inadequate main switchboard earthing, poor earth and neutral connections, electrical leakage from equipment (eg, hot-water cylinder heaters, and lack of equipotential bonding in facilities (eg, dairy sheds) |
| SWP | Site Works Plan |
| thermal uprating | a process to increase the maximum operating temperature of a transmission line. This may involve undertaking remedial works in spans that would not otherwise meet statutory clearance requirements under the increased conductor temperature |
| TMP | Traffic Management Plan |
| transmission losses | the energy or power losses on a transmission circuit that are caused by the resistance of the conductor material. This energy/power is converted to heat and dissipates to the air (or ground in the case of underground power cables) |
| Transpower | Transpower New Zealand Limited |
| triplex | an arrangement of three conductors per phase on an overhead transmission line. Commonly called a ‘triplex bundle’ |
| WHO | World Health Organization |
| WRPS | Waikato Regional Policy Statement |
This glossary is mainly derived from the ‘Glossary of Terms’ prepared by Transpower and provided to the Board on 25 March 2008.
