RLC Loads

The Lab-Volt 0.2 kW Electromechanical Training System (EMS) features four electrical load modules: the Resistive Load, Model 8311, Inductive Load, Model 8321, Capacitive Load, Model 8331, and the Inductive and Capacitive Loads, Model 8333.

Each model comes as half-size EMS module. The loads are identified on the module front panel by schematic symbols and enabled using toggle switches. Connections are made through 4 mm safety banana jacks.

Models 8311, 8321, and 8331 are equipped with nine load components (resistors, inductors, and capacitors respectively) arranged in three identical groups for balanced or unbalanced, 3-phase delta or star (wye) loading. Each group can be independently varied in seven steps of loading. The three groups can also be connected in parallel to create a single-phase load variable in 21 steps.

These models provide impedance levels that are adjustable for load equality, allowing students to measure the effects of indentical resistive and reactive loads on voltage and current in a circuit, as well as observe, using a wattmeter or a varmeter, the differences that each type of load has on an ac signal source. Furthermore, because complex loads are possible through the interconnection of these models, power factor correction and resonance phenomena are easily demonstrated in laboratory exercises.

The Inductive and Capacitive Loads module, Model 8333, is equipped with twelve load components (six inductors and six capacitors) and each type of load components is arranged in two identical groups. This model has been specifically designed for the Renewable Energy Training Systems (Series 8010) to familiarize students with reactive loads in single-phase ac power circuits at a reduced network voltage of 100 V.

Resistive Load

Model 8311

The Resistive Load Module, Model 8311, is equipped with 9 wire-wound power resistors. Each resistor is identified by a schematic symbol, the resistance value, as well as the current that will flow through it when connected to a nominal voltage power source. Each

resistor is within 5% tolerance of the stated resistance value.

Inductive Load

Model 8321

The Inductive Load Module, Model 8321, is equipped with 9 iron-core power inductors, which have a nominal Q of 10. Each inductor is identified by a schematic symbol, the inductance value, the inductive reactance, as well as the current that will flow through it when connected to a nominal voltage power source. Each inductor is within 5% tolerance of the stated inductance value

Capacitive Load

Model 8331

The Capacitive Load Module, Model 8331, is equipped with 9 oil-filled capacitors. Each capacitor is identified by a schematic symbol, the capacitance value, the capacitive reactance, as well as the current that will flow through it when connected to a nominal voltage power source. Each capacitor is within 5% tolerance of the stated capacitance value. A permanently connected discharge resistor reduces the voltage across each capacitor group to 5% of the applied voltage within 15 seconds after the load is disconnected from the supply.

Datasheet