Hi All,
We are making controller for 3 phase heater. It is ON/OFF controller, with heater in delta configuration with mains 400 VAC (phase to phase voltage).
Heater is always connected to one phase, while other two are controller with ST's BTA41-800BRG triacs. Problem arised during LVD pre-testing. According to the test 13.2 Electric strength - Part: Electronic disconnection from EN 60730-1 standard voltage from the Table 12 is applied between input and output. Table 12 says that for electronic disconnection, two times the maximum working voltage shall be applied. In our case (400 VAC + 10%) * 2 = 880 VAC voltage is applied for one minute. Maximum leakage current must be lower than 5 mA in order to pass the test. Maximum voltage for this test is 880 VAC * 1.41 = 1241 V that is applied directly between triac's main terminals. Applied voltage is way above Vdrm/Vrrm of the selected device.
Has anyone had experience with testing according EN 60730-1 standard? Have we understood described test setup correctly?
It is strange to us that we have to go with 1400 V triacs for this. Also, if we put any protection, they are based on the assumption that there will be short "interruption" during which triac or protective device will conduct. This is in contrast with requirement of maximum 5 mA leakage current, or 1 min test duration.
I've checked ST Community and found question related to similar (Does the BTA25 800BW triac have IEC 60730-1 and IEC 60730-2-9 certification?), but without answer.
There are similar devices in the market that are using ST triacs with 800 V Vdrm/Vrrm claiming that they are in accordance with EN 60730-1.
Regards,
Miso.
