1、Design,material,construction and operation and maintenance of the main reference standards

★Design：

GB/T 32512 Technical requirements for protection of photovoltaic power station against lighting

GB/T 50064 Code For design of overvoltage protectionand insulation coordination for AC electrical installations

GB/T 50065 Code for Earthing Design of ac Electrical Installations

GB 50650 Code for design protection of petrochemical plant against lightning

GB 50689 Code for design of lightning protection and earthing engineering for telecommunication bureaus（stations）

DL/T 1678 Technical specification for reducing resistance in power engineering

DL/T 1682 Guide for safety in AC substation grounding

DL/T 2049 Guide for the material selection of grounding device in power engineering

DL/T 2094 Anti-corrosion technical specification for grounding of AC electrical engineering

NB/T 35050 Earthing design guide for hydropower station

NB/T 31056 Technical specification of earthing for wind turbine generator system

Technical Code for lightning protection and earthing of railway

YD/T 5068 Specifications on lightning protection and earthing design for mobile communication base stations

IEEE Std 80 Guide for Safety in AC Substation Grounding

★Material：

DL/T 380 Technical condition of material for reduced ground resistance

DL/T 1312 Specifications for copper-clad steel in power engineering grounding

DL/T 1314 Technical condition of sustained release ion grounding device in power engineering

DL/T 1315 Technical permission of flux for exothermic welding in power engineering earthing installation

DL/T 1342 Specifications for electrical grounding engineering materials and connection

DL/T 1457 Technical specification for zinc-clad steel in power engineering grounding

DL/T 1675 Technical specification for feeding rod of HVDC ground electrode

DL/T 1677 Technical specification for grounding module in power engineering

DL/T 1678 Technical specification for reducing resistance in power engineering

DL/T 1679 The technical conditions for calcined petroleum coke of HVDC earth electrode

IEC/BS EN 62561 Lightning Protection System Components(LPSC)

IEEE Std 837 Standard for Qualifying Permanent connections Used in Substation Grounding

UL 467 Grounding and Bonding Equipment

★Construction：

GB 50169 Code for construction and acceptance of groundingconnection electric equipment installation engineering

DL/T 2309 Construction technology guide for sustained release ion grounding device in power engineering

DL/T 5168 Code for construction quality inspection and evaluation of 110kV~750kV overhead transmission line

DL/T 5733 Construction technology guid for the grounding module of overhead transmission line

★Operation and maintenance：

DL/T 475 Guide for measurement of grounding connection parameters

DL/T 1532 Technical guide for corrosion diagnosis of grounding grid

DL/T 1554 Guide for evaluation of soil corrosivity on grounding grid

DL/T 1680 Guide for condition evaluation of large grounding grid

TB/T 3233 Measurement method for railway integrated grounding system

2、Design ideas

Through soil environmental corrosivity evaluation,grounding material selection,thermal stability check of life cycle,grounding network construction,grounding grid security simulation calculation and evaluation(CDEGS),the requirements of grounding material size,technical parameters,grounding device structure layout and so on are put forward.

Grounding design principles are as follows:

▲For areas with low soil resistivity,the corrosion resistance of grounding materials should be considered

▲For areas with high soil resistivity,the resistance reduction measures of grounding devices should be considered

▲Check the thermal stability of grounding materials

▲Check grounding grid structure safety

3、Products provided by GREAT NORGA

Chengdu GREAT NORGA Science and Technology Co.,Ltd.provides complete grounding technology solutions,our company can customize products and services according to customer needs.GREAT NORGA brand products provides include:

Grounding principal material:the conductor material that provides the current channel.The grounding principal material provided by GREAT NORGA can meet the grounding of equipment and buildings in various environments:

▲NJ-CCS copper-clad steel grounding material(including copper-clad steel round wire,copper-clad steel bar,copper-clad steel tape,etc.),our products compliance with DL/T 1312;IEC/BS EN 62561-2;BS7430;UL 467,etc.

▲NJ-ZCS zinc-clad steel grounding material(including zinc-clad steel round wire and zinc-clad steel bar),our productscompliance with GB 50650 and DL/T 1457.

▲Grounding auxiliary material:Grounding material used to reduce the grounding resistance of the grounding device.

▲GREAT NORGA provides NJ-SIG slow-release ion grounding device,NJ-TED transmission line tower special grounding device,NJ-PHY-M physical resistance reducing agent and NJ-PHY-MM physical grounding module.Our products compliance with DL/T 1314;DL/T380;DL/T 1677;UL 467.

▲Electrical connection:Materials used for connecting metal conductors,it require stable and reliable electrical conduction and maintenance-free joints.

▲GREAT NORGA provides simple on-site operation,light and portable electrical connection products,including:NJ-EWM series exothermic welding(electronic ignition device and physical ignition device).Our products compliance with DL/T 1315;IEEE Std.837;UL467.

▲Test instrument：

    NJC-910 grounding grid corrosion state monitoring device,NJ-GTRF free line grounding resistance measuring instrument,Petrochemical station grounding grid performance monitoring device.

▲Grounding accessory:

    Grounding Test Well;Grounding Busbar;Equipotential Bonding Box;Subway Grounding Exi-device,etc.

▲Technical service:

    Sichuan Leijing Science and Technology Co.,LTD.(GREAT NORGA Holdings)is a professional engineering service enterprise,It has waterproof,anti-corrosion,thermal insulation engineering grade II qualification and special lightning protection engineering qualification.The company's professional engineering experience can provide grounding overall technical service chain,Including:grounding area survey,grounding engineering design,construction of grounding device,Anti-corrosion engineering of grounding device,condition evaluation of grounding grid,etc.