ZE4124 Panel for Studying and Testing Distribution Systems (neutral point connection) Didactic Equipment Vocational Training Equipment For College INTRODUCTION This panel enables teachers to develop an exhaustive classon the state of neutral conductor in distribution systems, sothat students can easily learn and test this topic. The actualelectric devices assembled in the panel and proper educationalterminals with high protection degree against accidentalcontacts enable to assemble the various confi gurations, as wellas a sight check of the operation: tests can be carried out withtraditional instruments. PANEL FOR STUDYING ANDTESTING DISTRIBUTION SYSTEMS(neutral point connection) Demonstration panel with electric components The fore panel of insulating material is the support of thenecessary devices for the development of the trainingprogram. The apparatuses are indicated on the panel withstandard international symbols. The application fi eld of thesedevices will cover installations of both civil and business and/or production (handicraft - industrial) sectors. TRAINING PROGRAM: This panel enables to study electric power distribution systemswith reference to the following main topics: TT, RN and IT systems Protection against direct contacts Protection against indirect contacts by earthing, electricseparation, automatic differential switch Protection against over-currents, selectivity in protectionDevicesEarthing system and conductors Natural, artifi cial earth plates Checking the insulation resistance in systems insulated fromearth (IT) Suitability of materials and of equipment Protections and breaking devices Moreover, it is possible to carry out the following instrumentalmeasurements and checks: Identifi cation of neutral and ground conductors Measurement of insulation resistance Measurement of earth resistance Continuity tests of protection conductors Check of the operation of differential switches Check of the protection with automatic break Measurement of fault loop resistance / impedance Measurement of fi rst earth fault in insulated systems TECHNICAL CHARACTERISTICS: The framework is of chemically treated sheet steel, paintedwith several coats of epoxy paint. Its base is provided withrubber feet so that it can be positioned on any working top. Thepanel also includes all the necessary electrical components fora correct power supply of circuits. The main components installed on the panel and accessible viasafety terminals for plugs of Ø 4 mm, are: 1 three-phase insulation transformer of 230-400 V / 230-400 V 1500 VA 1 automatic magneto-thermal switch 4 x 6 A, C curve, withminimum-voltage releasing coil, emergency pushbuttonwith mechanical holding and warning light indicating panelin operation 1 power line of 230 Vac - 1 A for powering auxiliary devices 1 three-pole lever switch for inserting two different values of earth capacitance in IT line 1 simulation of cabin earth with resistance of 0.3 Ω, 1 Ω 1 simulation of earth plate with resistances of 2 Ω, 20 Ω,200 Ω, 2 kΩ 2 simulators of electric uses with sinusoidal or one-wayearth fault current, fault resistance of 50 kΩ, 15 kΩ, 5 kΩ,1.5 kΩ, 500 Ω, no-resistance earth fault 1 monitor for insulation control in IT systems with regulation of the value of intervention sensitivity and scale formonitoring the instantaneous value of system insulationresistance 1 automatic differential magneto-thermal switch 4 x 2 A,C curve, class AC, possibility of using only the magnetothermalswitch without the differential section 1 four-pole differential circuit breaker of 25 A / 0.3 A, classA, “S” selective 1 set of three fuse holders, with breakable neutral conductor and fuses 10.2 x 38 of 1 A and 2 A1 automatic magnetothermal differential switch 2 x 1A, curve C,class AC, with possibility of using the onlymagnetothermal switch without the differential part 1 automatic magnetothermal differential switch 2 x 1A, curve C, class A, with possibility of using the onlymagnetothermal switch without the differential part 1 differential relay coupled to a toroidal transformer withadjustable current Idn and intervention time Dimensions of panel: 800 x 600 mm Dimensions of framework: 840 x 450 x 680 mm Net weight: 45 kg REQUIRED UTILITIES (PROVIDED BY THE CUSTOMER) Power supply: 400 Vac 50 Hz three-phase - 1500 VA (Other voltage and frequency on request) OPERATIONAL HANDBOOK WITH EXERCISES ACCESSORIES: Three-phase power cord of 5 m with EEC socket and plug 20 jumpers with safety plugs of Ø 4 mm for assemblingvarious installation conditions Set of 20 various leads with safety plugs of Ø 4 mm
