The HME-702 three-phase relay tester is a versatile testing device that can be used to test a wide range of protection relays, including those used in ABB's REJ series and Siemens' SIPROTEC series. Some of the key testing capabilities of the HME-702 relay tester include:

1. Trip time testing: The HME-702 can be used to test the trip time of protection relays, ensuring that they are able to operate within the required time frame in the event of a fault.

2. Pick-up and drop-off testing: The HME-702 can be used to test the pick-up and drop-off values of protection relays, ensuring that they are able to detect faults accurately and reliably.

3. Harmonic testing: The HME-702 can be used to test the harmonic response of protection relays, ensuring that they are able to detect and respond to harmonic distortions in the power system.

4. Directional testing: The HME-702 can be used to test the directional protection function of protection relays, ensuring that they are able to detect the direction of faults and operate accordingly.

5. CT and VT testing: The HME-702 can be used to test the accuracy of current and voltage transformers, ensuring that the protection relays are receiving accurate input signals.

One of the key advantages of the HME-702 relay tester is its ease of use. The device features a user-friendly interface and can be controlled using a laptop or tablet, making it easy for technicians to perform tests quickly and accurately. Additionally, the HME-702 is highly portable, making it an ideal testing solution for field technicians who need to perform tests on-site.