Protection Relays Application

The Protection Relays Test Application, is one of the most advanced and safe equipment in the market for studying the operation of protection relays used in real electrical substations.

ATENG 11593 — Protection Relays Application

• The “ATENG 11593” application consists of the following elements:
• ERP-UB. Protection Relays Test Base Unit.
  The Protection Relays Test Base Unit, “ERP-UB”, has been designed for
  comprehensive investigations into the theory and practice of electrical power
  system protection.
  This unit is common for the relays type “ATENG 11593” and can use one or more
  relays.
  Floor-standing unit, mounted in anodized aluminum frame and panels of
  painted steel, enabling wide range of protection relay investigations.
  It uses genuine industrial application relays, not simulations, with full range
  of safety features incorporated throughout.
  Diagrams on the unit enable students to set up and perform practices and
  experiments with minimal supervision.
  Comprehensive controls, transformers, supplies and instrumentation.
  Modern, ergonomic and practical design which includes desk space for
  users or students to work on, and mounting area for relays.
  It is supplied with relay support software.
  Selection of up-to-date numerical protection relays, specially adapted for
  educational use (see required and recommended relays).
• This unit consists of this main parts:
• Main connections, control and measurement board:
• This board has two parts: left hand, right hand and common emergency
  stop switch in the centre of them.
• Elements of the board left hand part: ERP-UB
  Input/output signals exchange connector and relay trip indicator.
  Fixed three-phase voltage output terminals.
  Power supply security connection key switch.
  Second fixed three-phase voltage output terminals.
• Variable three-phase voltage output terminals. (0 – 400 VAC).
  Measurements power analyzer.
• Variable three-phase current output terminals. (0 – 10 ATENG 11921).
  Six current transformers with transformation relation 50/5 CT= 10.
• Three voltage transformers with transformation relation:
  Primary= 400/√3.
  Secondary= 110/√3.
  PT= primary/secondary= 3.64.
  Emergency stop switch.
• Elements of the board right hand part:
  Input/ouput signals exchange connector and relay trip indicator.
  Fixed three-phase voltage output terminals.
  Power supply security connection key switch.
  Second fixed three-phase voltage output and transformer input terminals.
  Transformer primary voltage tap changer selector.
• Transformer secondary connection type selector: star/delta.
  Measurements power analyzer.
  Transformer three-phase voltage output terminals.
• Load connection type selector: star/delta.
  Delta and star load terminal connectors.
  Six current transformers with transformation relation 10/5 CT= 2.
• Three voltage transformers with transformation relation:
  Primary= 400/√3.
  Secondary= 110/√3.
  PT= Primary/Secondary= 3.64.
  Emergency stop switch.
  Three-phase voltage regulation dial selector.
  5

Specifications

Three-phase load regulation dial selector.

• Unit power supply and protection:
  Three-phase power supply.
  Current source overload thermal protection.
  Left board part magnetoghermal protection.
  Right board part magnetothermal protection.
  Left board part voltage measurement circuit protection.
  Right board part voltage measurement circuit protection.
  Control circuits magnetothermal protection.
• Required elements to operate with “ERP-UB” (Not included):
• ERP-MF. Fault Injection.
  It enables the injection of different types of short circuits, in any point of the Protection Relays Test
  Base Unit, “ERP-UB”. It is req uired line unit, directly or through a variable pure resistive element.
  Employing this element we can analyze the different protection elements functionality with different
  fault intensity.
• The short-circuit injection possibility are:
  Three-pole short-circuit.
  ERP-MF
  Two-pole short-circuit.
  Two-pole ground short-circuit.
  Single-pole ground short-circuit.
• Test circuits:
  Configurable power transformer test circuit.
  Configurable load test circuit.
  Configurable measurement test circuit.
  Relays test area.
• AE1. Transmission Lines Simulation Unit.
  This unit represents basic concepts of the electric energy high voltage three-phase transmission
  lines operation. It simulates a value modifying concentrated parameter line that allows different
  configurations and consists on three conductor line (L1, L2, L3) and a neutral or return line (N).
  Each of the phases is represented, following the concentrated parameters theoretical model,
  through a resistance series association and inductance, along with a parallel association
  between each one of them in a capacitance effect.
  A way to reduce the earth short circuit current is to have impedance in the neutral to ground
  connections. This impedance has no repercussion in the normal functioning of the network
  but they introduce a repercussion in the increase of 3 x Zo (impedance on the zero sequence AE1
  component), which reduces the short circuit current.
  The return line is simulated through small value impedance that has a resistive inductive
  characteristic. To simplify the effect, being a negligible inductance, it will be simulated with a pure
  10 Ω resistance.
  The phases have two terminals at the input and two at the output, and they are connected at the
  interior. Through one of them the unit will be supplied. Through the last one the natural circuit
  will continue to the load module, the busbar module, the transformer, etc. There are additional
  terminals for assembly of protection relay or other parallel configurations.
  The supply of this unit will be done through line terminals (L1, L2, L3) and the neutral (N) through
• a 400 V three-phase supply and it will be controlled by any power circuit breaker of 4 poles placed
  between the supply and the lines section.
  In the phases we can distinguish different resistance and inductance values, being able to simulate
  different length transport lines.
  The resistive part is formed by two resistance values of 15 Ω and 33 Ω, with the possibility
  of making parallel series connections between them, obtaining two additions resistive values of
  10.31 Ω and 48 Ω.
  The inductive part consists on a multistage coil of despicable resistance. In which it is possible to
• choose one of the following values: 33 mH, 78 mH, 140 mH, 193 mH, 236 mH.
  The capacitive part will be divided into capacitance between conductors and capacitance between
  line and ground.
  6

Specifications

The capacitance between conductors is simulated with a pair of capacitors at the beginning

• and at the end of the line with different values: 0.5 µF and 1 µF for each conductor.
  The capacitance between conductor and ground is 1 µF and 2 µF, also at the beginning and
  at the end of the line.
  With all these values it is possible to simulate a great number of line configurations, beginning
  with different line distances with different types of conductor, through the unbalanced lines with
  different conductors groups (simplex, duplex, triplex and cuadruplex). At the same time it is
  possible to simulate transient state with different short circuits injection using the fault injection.
  This unit is protected with a ground connection that comes from the metallic frame and that is
  accessible through a terminal in the front of the unit.