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Test Interfaces for Power Systems



The FTS is a test block for interfacing substation devices (protection relays, fault recorders, revenue meters, ... ) to the voltage and current transformers and to other equipment on the system side of a power grid.

The FTP is a test plug keyed to a particular configuration of FTS test blocks. Once inserted into the corresponding test block, the FTP plug isolates the substation devices from the system side equipment while at the same time allowing connection of test equipment for secondary injection tests.

Key Features

  • Finger safe
    There are no exposed metallic parts on the FTS test block or on the FTP test plug, greatly increasing safety during testing. Even the back-side is finger safe.
  • Patented Keyed Test Plugs
    Test plugs are keyed to the corresponding test block, preventing mistakes and errors during test.
  • Test During Operation
    The construction of the test plugs prevents contact between the test set and the current and voltage transformers during insertion or removal, a precondition for testing an asset without having to disconnect it from the grid.
  • Built-in Time Sequencing
    When a FTP test plug is inserted into a FTS test block, contacts are opened in a pre-defined sequence. This is done to prevent false trips from activating the breaker, greatly simplifying the task of testing. The intelligence is built into the plug: different length fingers create the sequence and fixed current shorting bars provide safe and reliable make-before-break current shorting. When the FTP test plug is removed from the block, contacts are closed in the reverse order, with the trips contacts being the last to close.
  • Less than 2 mΩ internal resistance
    Thanks to the patented construction, FTS / FTP test blocks have an extremely low internal resistance. This decreases the burden placed on instrumentation transformers and also reduces heat dissipation inside cabinets and panels.
  • Over 100 Models and Counting
    Models with 8, 10, 12, 14, 16, 18 or 20 poles. Any combination of currents, voltages or trip signals. Custom labeling. The right FTS test block either already exists or can easily be created.

Principle of Operation

Closed circuit
A FTS test block contains 8, 10, 12, 14, 16, 18 or 20 modular units (or poles) each allocated to a current, voltage, signal or trip circuit. Each circuit is connected through the block via two silver-plated copper contacts, pressed securely together by two pressure springs to create a highly conductive electrical connection. In this situation, an electrical connection is established between the device side (B) and the system side (A).
Open Circuit
When testing, the corresponding FTP test plug is inserted into the test block. In this position, the device and system sides of the test block are isolated from each other. The test plug includes internal shorting bridges for the current circuits. When the test plug is removed from the test block, the internal springs force the contacts back together, returning the circuits to its normally-closed position.
Signal Injection
Banana jacks in the test plug allow the connection of a test set to the device side of the test block and the associated signal injection. Access to the system side is also provided.


Cases for FTP Test Plugs
Rugged case for FTP Test Plugs with handle or Test Probes.
Current Measurement Probe
This special test probe allows the connection of current measurement device or a shunt. The AWG 13 (2.5 mm) connection cable has a length of 118.11 inch (3 meters). The test probe are available with c-hook terminals or banana plugs at the tip of the cable.
FTS 19´´ Rack Plates
SecuControl offers metal plates for installation of FTS test blocks in 19” racks that come painted in various colors and with various cutouts for FTS test blocks, in standard heights of 2U or 3U.

Please consult our manual on the download section of this site for ordering information



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