In high or medium voltage power systems, relays are frequently found device. Their main purpose is to isolate a faulty section just within few cycles but by ensuring minimum interruption to healthy sections. An ideal relay is a unit that acts while overcoming the costs of damage to imperfect section. With usage, the connections of relay get contaminated or deteriorated with carbon particles, etc. Therefore, it is advisable in the interest of both the manufacturer as well as the end user to check the behavior of the relay after time intervals.
With time, relay technology has evolved and so is relay testing. A good number of computer aided testing systems for latest microprocessor relays are developed. When it comes to the incomparable, smallest and lightest relay test set, Amperis provide the best tools you need to test your protective relays and meters. The equipments are capable of dealing with all types of tasks which were earlier conducted by big equipments.
Today’s protection relays offer multiple protection functions that require a new level of refined test software and hardware that can completely analyze the operation of the unit in “real life” situation. Relay testing and it's every facet can be easily handled with advanced relay test equipments. Previously, Relay testing equipments were associated with large size and heavy weight. In that condition, carrying the relay testing equipments to the work site, seems to be the job of physically strong men. But now, with advancement of technology, the relay testing equipments are smaller in size and easy to use.
With the comprehensive and sophisticated line of relay test equipment from Amperis, each and every facet of relay testing can be handled effectively. In that sense, Amperis offers the powerful range of relay testing equipments that can live up to its reputation as a colossus. Relay testing equipments by Amperis include:
- 3-Phase Relay testing AK-6
- 3-Phase Relay testing AK-30
- 3-Phase Relay testing AK-10
- Primary Current Injection Source APCI-600
- Relay testing ARFD 200
- Molded Case Circuit Breaker Tester AMCCB250
Purpose of Relay Testing:
Relays are discrete devices, unlike integrated circuits; they are used to facilitate a low power logic signal to control much higher power circuit. The relay helps to isolate the high power circuit from the low power logic circuit in order to protect the low power circuit. For accomplishing this, relay provides a small electromagnetic coil for the logic circuit to control, and when the coil is energized; it results in a high power capacity magnetized switch that activates the high power circuit.
The relay that provides a high amount of current to the headlights of an automobile is an example of this. At the time of relay controlling, the low power logic circuitry from the dashboard of the car activates the headlights.
Relay testing equipments:
A relay is usually accompanied with a coil, a set of contacts and a pole terminal. There are two types of contacts in the relay testing: normally open and normally closed. normally open (N/O) are the set of contacts that are open when the relay is not energized and normally closed (N/C) contacts are the set of contacts that are closed when the relay is not energized.
Using relay testing equipments requires a desired knowledge. The equipments need an understanding about their usage. There are many new products for relay testing available, each accompanied with user manual to understand the workings.
Modern relay test equipments typically incorporate the features like:
- Linear amplifiers with feedback or switch mode,
- Protection for open current channels, over temperature, shorted voltage channels, and internal fault conditions.
- They are designed with intelligent control system which realistically simulates the power system.
To avoid damage and for better performance of relay test equipments, it is essential to know the equipment basics before usage:
- Make sure you properly store and transport your test set.
- Do not try to push 1800 watts forcefully through a 100’ 14awg extension cord or undersize bench wiring.
- Be aware of condensation conditions.
- Keep proper care of ventilation openings or do not allow foreign material to enter the test set.
- Never try to connect a current amplifier to external voltage source like a station battery or any other source.
- Do not try to trip a breaker, roll a lockout or power any significant load with the contact output.