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Overhead Networks

Gridworks has a comprehensive portfolio of products to enhance Overhead Networks, from intelligent equipment that helps identify and isolate faulty sections of an overhead network, to equipment that will help to eliminate the fault safely. 

Speed up fault identification with Horstmann Fault Passage Indicators. Now available in New Zealand exclusively through Gridworks.

Horstmann Short Circuit and Earth Fault Indicators (also referred to as Fault Current Indicators) identify faults within medium voltage networks. Installing these devices at strategic points in the network quickly identifies the network section where a fault has occurred.  

Fault Passage Indicators can detect permanent and transient faults on feeder cables and overhead lines. Indication can be via the unit itself, or back to the control room via SCADA. As part of a Smart Grid system, selected units support the reporting of information such as load current and conductor temperature.


1. NAVIGATOR LED + Flag

The NAVIGATOR LED+FLAG product, based on the SMART NAVIGATOR electronics, offers a 50 A (100 ms) sensitivity with a highly visual mechanical flag and bright LED flash. The NAVIGATOR LED+FLAG is highly recommended to those looking for simple, low-cost effective visual only indicator. 

2. NAVIGATOR LM

Overhead fault passage indicators have become a major component of distribution networks as utilities try to reduce outage time and improve system reliability. The NAVIGATOR LM series of Fault Passage Indicator (FPI) offers self-adjusting trip ratings and can be used for identification of permanent or transient fault passage. These FPIs have stainless steel hardware and an ultraviolet inhibitor for long- lasting performance. 

 Features:

    • High Visibility 
    • Self-adjusting trip rating 
    • Peak Load Memory 
    • Permanent or Transient Fault indication 
    • ‘Low battery’ indication, with replaceable lithium cells (20 years monitoring life) 
    • IP68 rated 
    • Hotstick shotgun Installation 

This self-powered FPI can be installed in seconds using a shotgun insulated stick and is armed and ready to operate. 

The NAVIGATOR LM has a 100 A minimum trip rating with 0 to 30 A of load current and automatically adjusts its trip rating when load rises above 30 A. There are no settings or DIP switches – the unit adjusts automatically to the load current. 

The NAVIGATOR LM recognises peak load current and will hold that trip rating for 72 hours offering complete inrush immunity. The units are powered by four replaceable lithium cells which offer over 20 years of shelf life and 500 hours of flashing life. A low battery LED indicator give crews six months to replace the cells. 

 Six super-bright LEDs are activated upon sensing fault current. Easily visible during the day or at night, the NAVIGATOR LM quickly allows line crews to locate the fault. 

 Several options are available for both permanent and momentary fault finding. All units can be reset manually with a magnet and automatically by time. Current and voltage reset options are also available. 

 

3. SMART NAVIGATOR

The SMART NAVIGATOR overhead fault passage indicator (FPI) is designed and engineered for smart grid distribution automation applications. Installed on overhead distribution and sub-transmission lines, it transmits event-based fault information and continuous circuit status information via low power radio to a local receiver (The SMART REPORTER or KIWI REPORTER). 

The FPI design allows easy installation and/or removal with a hot stick to the overhead conductor. 

The SMART NAVIGATOR indicates a line fault locally by LED and also over a wireless radio link to the SMART REPORTER / KIWI REPORTER which makes this information available for remote monitoring via SCADA. This in turn drastically saves time in the identification of faulty line sections, by directing lines staff directly to the section, and substantially speeds up the process of restoring the power supply to the utility customers. 

The SMART NAVIGATOR also continuously monitors and transmits network information, such as load current which helps identify distribution grid capacity. Information can be used to improve grid planning and to support analysis of predictive or post-fault switching decisions. 

The FPI design allows easy installation and/or removal with a hot stick to the overhead conductor. 

SMART NAVIGATOR  HV version is available which allows conductor temperature monitoring to be reported to SCADA. 

SMART NAVIGATOR HV DCFI (Directional) version allows conductor temperature monitoring but in addition is a directional device , flashing RED or GREEN depending upon the fault direction. Ideal for use on ring circuits or lines with back feeds. 

 

4. SMART NAVIGATOR 2.0

The SMART NAVIGATOR 2.0 Master can be fitted with 4G SIM card to communicate fault and status information. Using low power radio the Master acts as a data concentrator for the two nearby Satellite units. This allows one ‘communication node’ per site. SMART NAVIGATOR 2.0 Master and Satellite units are line current powered with built-in rechargeable batteries.  

  • Master unit with inbuilt 4G modem – just add a SIM card to enable communication connectivity 
  • Master unit communicates with two satellite units 
  • Self-powered (rechargeable battery) [requires a 5 A current to maintain line-powered functions (with once per day communications), with greater than 25 A current, data reporting at 15-minute intervals becomes possible]. 
  • Load current and conductor temperature monitoring 
  • Directional fault indication and power flow indication 

Low power option (with above SMART NAVIGATOR 2.0): 
SMART NAVIGATOR 2.0 uses line power to recharge batteries that drive the device’s electronics. However, where the line current is below the 5 A current needed, then it is possible to install three primary battery powered Satellite units that communicate to a ‘Pole Master’, pole mounted communication device. The Pole Master can act as a hub for up to 6 Satellite units within a 50 m radius. 

5. Pole Master – SCADA Interface

The Pole Master connects via low power radio to up to 6 x SMART NAVIGATORS 2.0′ Satellite units which can be located up to 50 m away. The Pole Master has a 4G modem to allow the SMART NAVIGATORs to be monitored via DNP*/iHost SCADA systems. The Pole Master is provided with a solar panel sufficient for powering the 4G modem for once per day reporting with 100-hour battery backup. If the Pole Master is powered from an auxiliary source, the direct continuous DNP connection is possible. 

 

6. Smart Reporter & Kiwi Reporter

The SMART/KIWI REPORTER connects with up to 12 local SMART NAVIGATOR FPIs (approx. 30 m radius). This allows one SMART/KIWI REPORTER to cost effectively monitor T connections (main and spur) or double lines. The SMART/KIWI REPORTER communicates via DNP (serial or IP) allowing FPI’s to be integrated into a smart grid system. The SMART REPORTER and KIWI REPORTER are differentiated by the battery capacity, enclosure construction and power of radio/modem they can support. 

A KIWI REPORTER version is available for use with SMART NAVIGATOR 2.0s 

Event-based reporting  

Overhead SMART NAVIGATOR signals (to the SMART/KIWI REPORTER/SCADA system)  

  • Fault detection 
  • Momentary versus permanent fault detection 
  • Fault current magnitude and duration 
  • Time and date stamp 
  • Loss of current alarm 

SMART/KIWI REPORTER signals to SCADA  

  • Loss of its power supply 
  • Health check alarms 
  • Tamper detection 

Continuous Reports (every 15 minutes) 

Overhead SMART NAVIGATOR signals (to the SMART/KIWI REPORTER/SCADA system)  

  • Line current (average, max and min current each 15 minutes) 
  • Ambient temperature 
  • Conductor temperature (with ‘HV’ versions of SMART NAVIGATOR) 
  • Voltage presence (option 110 kV) 
  • Routine call 
  • Health check 
  • Battery status 

The SMART REPORTER is provided in a polyester enclosure, and supports low power modems (12V, <500 mA). An AC auxiliary supplied version and a solar powered version are available. The unit can be supplied with our recommended low power GPRS/GSM modem – or without.  

The KIWI REPORTER is supplied in a stainless-steel enclosure. Its larger battery and power supply capacity is designed to supports higher power radios (12V, 2 A) (customer supplied). An AC auxiliary supplied version and a solar powered version are also available.  

Through its predecessor, Allis Chalmers, Siemens originated the 5-8% step voltage regulator. Today, Siemens is the largest supplier of installed outdoor step voltage regulators worldwide.

While the range includes JFR single phase regulators, Siemens also produce the SFR three-phase ground mounted regulators, which are used by several New Zealand lines companies for applications where single-phase regulators are unsuitable. 

Surge Arresters are used protect HV equipment against the effects of overvoltages caused by lightning and switching. Siemens Energy Surge Arresters are exclusively available in NZ through GRIDWORKS. We offer premium products for long-life effective overvoltage protection. Contact us to discuss your network specifications so we can guide you to the optimal Surge Arrester for your applications.

Reclosers are used on overhead lines to switching normal and break fault currents. With the necessary sensors and controllers enabling automation, they be part of an automation system to trip and reclose several times, avoiding longer network interruptions. 

Gridworks carry the range of pole mount SIEMENS 3AD3 (Vacuum recloser), cross arm mount 3AD7 (Compact Module Recloser) and the Fusesaver line mounted (Vacuum Circuit Breaker, recloser or sectionaliser).

Gridworks carry the SICAME range of Connectors & Fittings

Sicame is actively involved in design & manufacturing of specialist equipment for LV & MV Overhead & Underground distribution systems, safety and personal protection, earthing, transmission line & string fittings including high temperature conductor fittings up to or exceeding 500kV

Medium voltage fuses are defined as fuses with a voltage rating greater than 1,500v and less than or equal to 36,000v (36kV).

Portable Earthing Devices (portable earths) are personal protective devices which are used to protect electrical workers if the high voltage equipment they are working on is re-energised. In the event that a conductor is energised inadvertently, the aim of a portable earth is to:  

    • provide a controlled path for the current away from an exposed worker to allow short-circuit detection equipment to operate and disconnect supply quickly 
    • to minimise the voltage rise and reduce the chance of electric shock   

Cable Networks

Gridworks has a comprehensive portfolio of product to enhance Cable Networks, from intelligent equipment that helps identify and isolate faulty sections of the cable network, to equipment for reliable jointing and connections. 

Speed up fault identification with Horstmann Fault Passage Indicators.  

Horstmann Short Circuit and Earth Fault Indicators (also referred to as Fault Current Indicators) identify faults within medium voltage networks. Installing these devices at strategic points in the network quickly identifies the network section where a fault has occurred.  

 Fault Passage Indicators can detect permanent and transient faults on feeder cables and overhead lines. Indication can be via the unit itself, or back to the control room via SCADA. As part of a Smart Grid system, selected units support the reporting of information such as load current. 

See also Fault Passage Indicators for overhead networks


 

Our separable connectors are manufactured from EPDM rubber, an extremely robust material. This thick outer conductive layer of EPDM, coupled with its overall shape and design, provides the basis for the most reliable and safe connector on the market, which is why they are approved and used in most networks across in Australia.

Separable screened connectors help eliminate the causes of outages and make restoring power easier and faster.

The Elastimold brand of Connectors using high quality EPDM materials provide a convenient method to connect/disconnect cable and equipment on power distribution systems.

  • Fully shielded
  • 100% peroxide-cured construction
  • Fully submersible molded rubber housing
  • Conductive EPDM materials
  • Provision for hot stick operation
  • Provision for ground wire connection
  • Wide cable range with minimum number of sizes

Equipment bushings are molded epoxy insulated parts for use in equipment insulated parts for use in equipment insulated with oil fluid or gas insulated, typically for transformers, switch gear, capacitors…

Straight joints are designed for jointing screened polymeric cable to be laid in air or directly buried. The product is fully screened and fully submersible. Transition joints are used to joint single and three core paper cables to three single core polymeric cables.

Terminations are used to connect polymeric insulated cable to equipment and for the outdoor terminating on to overhead lines or bus bars. Indoor terminations are designed for use indoors in controlled environmental conditions and subject to light condensation. Outdoor terminations are for outdoor use and exposure to prolonged sunshine and other weather conditions.

We have available a wide range of compression and mechanical links and lugs, for low or medium voltage aluminium or copper cables.

  • Mechanical Shear off Lugs
  • Mechanical Shear off Links
  • New – Mechanical Shear off Cable Lugs with 2-hole palm

We stock a complete range of cable preparation tools to splice and terminate cable for the transmission and distribution industry and electrical construction and maintenance. All tools are designed and manufactured to meet specific cable application needs, including accurate removal of insulation, semi-conductive sheathing, protective jacketing and other materials to produce consistent, uniform preparation of cable ends for splicing and termination.

We provide custom, ready-to-install cable leads. These are available equipped with Interface A to F connectors and terminations (Heat Shrink, Cold Shrink and Slip on).

Cable types available are standard MV XLPE and Class 5 Flexible cables.

Just specify connector/termination type, cable type and length and we will take care of the rest – assembled and tested.

Testing options includes HiPot (AC withstand) and partial discharge (PD).

We offer a range of underground junction solutions for renewable projects.

Our product range includes our Australian designed and manufactured UJC (Underground Junction Chamber) which can be used as a connecting point for cable-jointing and branch applications.

Nexans Manufacture a range of LV Cable Accessories:

  • LV Joints suitable for 3, 4 & 5 core polymetric insulated cables
  • LV Mechanical shear off Lugs and Links

KOZ Products BV cable clamps were designed specifically to provide the best way of securing fitting low, medium, and high voltage cables to reduce cable equipment damage that can occur with large fault currents. 

 They can also be used for non-electrical cables such as tubes and (hydraulic) pipes. KOZ Products BV cable clamps range from 11 to 160 mm diameter. 

Compensated Networks

In New Zealand and Australia, there is an increasing demand to reduce the number of supply interruptions experienced by consumers. For Network owners there is also a statutory requirement to meet minimum SAIDI and CAIDI standards. One way of substantially improving these is to be able to operate the network safely and in continued operation in the presence of earth faults. 

Resonant Earthing solutions are now engineered and delivered as complete systems for New Zealand by Gridworks. Utilising products from A.Eberle and EGE, a Petersen coil is connected between the neutral point of the supply transformer and earth. The REG-DP/DPA controller tunes the coil to match the system capacitance, thus compensating the fault current. Each feeder circuit is monitored by an EOR-D relay which detects earth-faults on the system and provides feedback via through SCADA interface to the network control centre. 

Marketed under the name RE+DS (“Resonant Earthing + Earth-fault Detection Systems”), the individual components are also available for separate applications, such as Earth-fault detection and location on non RE+DS systems. 

EOR-D & EOR-3D 

The EOR-D relay monitors each feeder in a compensated system and provides prompt and accurate remote indication upon which feeder the earth-fault is located. The EOR-3D can be installed throughout the network to act as fault passage indicators. The EOR-3D allows line crews to quickly identify the area the fault is located within.

Services

Service offering available from Gridworks

Gridworks brings a partnering culture to the industry that sees knowledge sharing with our customers as an essential element in service provision. Our commitment to providing the expertise and training to use the products we supply is total. In doing this, we offer comprehensive training services that meet the stringent expectations of the internationally renowned brands we work with

Gridworks offers tailored Service Level Agreements (SLAs) to our customers, to reflect their specific operational requirements. Our customers find that having an SLA in place provides confidence in areas such as holding emergency spares, minimum stock levels and guaranteed delivery times.

Tools

Gridworks equips professional cable jointers with a complete range of cable preparation tools and personal safety equipment. We can advise on and supply Hotstick fittings, including hot and measuring Sticks and Hotstick-operated current and voltage detectors. Our large selection of tools for rigging, lifting and line-mechanics includes emergency universal wire cutters, tree trimmers and pruning saws. Plus our safety portfolio has everything you need, from insulated blankets, floor mats, line guards and insulating hoods to Arc flash equipment and gloves.

  • Tooling  

When it comes to making safe, dependable hot line tools and equipment, Hastings have satisfied tough customers around the world. As originators of the Tel-0-Pole telescoping hot stick and many other patented products, Hastings are proud to be the industry innovator for hot line tools and equipment.

Hastings started business in the USA, and today are a worldwide supplier with products in use in more than 50 different countries. At home and abroad, they remain focused on delivering tools that line crews can really trust.

Over the last 40 years their reputation for quality, dependability and long-lasting product life has been field-tested in all 50 US states and around the world.

Innovations and Patents

  • Originator of the Telescoping Hot Stick
  • Tel-o-Pole II the no twist stick
  • Insulated ratchet cutters
  • Sectional/telescoping shotgun sticks
  • Regulator Neutral Detector
  • Digital High Voltage Phasing Meter
  • Hot Line Indicators
  • Hot Stick Tester
  • Ground/Jumper Assembly Tester

Insulated Gloves 

 1. electrical insulating gloves 

These gloves are made of latex, which guarantees high dielectric qualities. They do not offer mechanical protection, and must be used with over gloves if there is a risk of damaging the glove during work.

 

2. Electrical insulating gloves with enhanced mechanical protection 

These gloves are made of composite material, which offers enhanced mechanical protection (optional tests in standard NF EN 60903). It is therefore unnecessary to wear over gloves. 

 

3. Over gloves 

Designed in flexible and resistant leathers, they protect insulating latex gloves from any risk of cutting or damage. Their ergonomic shape makes it possible to maintain great dexterity for low voltage work. 

Please note: It is preferable to choose over-gloves of a size above the size of the insulating gloves. Over gloves do not provide insulating protection or mechanical protection of the hand. 

 

4. Under gloves 

CATU offers under-gloves to wear under insulating gloves. In addition to being hygienic, they also offer great comfort of use by protecting from the cold or absorbing perspiration. The mittens version is particularly suitable for low voltage and for the sensitivity required for precision work.  

 

Please note, these gloves do not provide insulating protection. 

5. ARC Flash Protection

6. CAT’ARC jacket and trousers

The CAT’ARC jacket and trousers have been developed and tested in accordance with current standards whilst still being comfortable and stylish to wear. MULTI-RISK PROTECTION – CAT’ARC garments offer wide-ranging protection to wearers exposed to electric arc, heat/flames, welding and electrostatic thermal hazards.

 

These garments offer safety, comfort and durability. Both the jacket and trousers have been designed with everyday comfort in mind, utilising fabric that ensures operators are able to wear the garments for a full working day.

7. 20 CAL ARC Flash Protection CATU MO-180_Arc Helmet 

CATU MO-180-ARC is a 20 Cal arc flash protection helmet – the only all integrated helmet with ‘arc flash’ face shield on the market. The helmet with face shield weighs 1.2kg in total.  

 

20 cal/cm² refers to the units of incident energy that the face shield kit can withstand 

 

Features  

  • Mechanical & Electrical Protection helmet EN 397EN 50365 
  • Retractable face shield with high visibility and UV Protection. 
  • According to NFPA 70E ASTM F 2178 IEC 61482-2 IEC 61482-1-1 IEC 61482-1-2 class 2 GS-ET 29 
  • Light, compact and flexible protection in arc rated fabric ASTM F1959 ASTM F1506 
  • ATPV 20 Cal/cm² 

 

Earthing

Portable Earthing Devices (portable earths) are personal protective devices which are used to protect electrical workers if the high voltage equipment they are working on is re-energised.

 

Portable Earthing Devices

(portable earths) are personal protective devices which are used to protect electrical workers if the high voltage equipment they are working on is re-energised. In the event that a conductor is energised inadvertently, the aim of a portable earth is to: 

  • provide a controlled path for the current away from an exposed worker to allow short-circuit detection equipment to operate and disconnect supply quickly 
  • to minimise the voltage rise and reduce the chance of electric shock

   

Earthing and short-circuiting equipment for LV connection and network switchboards