- ITS is a flush-mount 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.
- STP is a test plug keyed to a particular configuration of ITS test blocks. Once inserted into the corresponding test block, the STP plug isolates the substation devices from the system side equipment while at the same time allowing connection of test equipment for secondary injection tests.
- Finger-safe The front of the ITS test block and the matching STP test plug has no exposed metallic parts, greatly increasing safety during testing.
- Patented Keyed Test Plugs Test plugs are keyed to the corresponding test block, preventing mistakes and errors during testing. Current circuits are keyed different than other types of circuits, allowing the use of individual test probes while maintaining the safety benefits.
- Built-in Time Sequencing When a STP test plug is inserted into an ITS 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 STP 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, ITS / STP 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.
- Many sizes and configurations The right ITS test block for you either already exists or can easily be created. The 4600 series includes popular models with 7, 10, 14 and 20 poles. Custom configurations have 7 to 20 poles and can be built with any combination of currents, voltages or trip signals, as well as custom labeling.
- Standardized Testing Procedures Choose a few different ITS/STP configurations that cover all of your testing needs and use standard test routines for similar devices. This will save time, increase operator safety, and avoid costly errors.