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Testing of a GEC MYTU (field failure) relay.

Testing of a GEC MYTU (field failure) relay.

Testing of a GEC MYTU (field failure) relay.

(OP)
Hi ,

Hope someone can help me.

(Z1 calculated Impedence out by more than 15%)

MYTU relay settings
Time:2sec
Z1:11Ω
Z2:176Ω

Test results
Pick up current for Z2 check _ 55Volt @ 0.149Amps were recorded.
calculated Impedence 173.56Ω   within 15%

Rest (Z1 check) _ 40V @ 3.030Amps were recorded.
calculated Impedence 6.6Ω  (<15% error)
It should  be within 15% of set value (11Ω)

have i used the correct formula for Z1

Formula used,
Z2=v/2I-Z1

Z1=v/2I

Thank you
 

RE: Testing of a GEC MYTU (field failure) relay.

I'm not sure you did the tests, but
Z1 = V/I at pickup for Z decreasing from a value >Z1
Z1+Z2 = V/I at pickup for Z increasing from a value <(Z1+Z2)
(assuming Z1 and Z2 with X<0)

Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.

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