Power detection equipment to be connected to the correct use, the following example, microcomputer relay protection tester wiring steps.
choose
Open the "frequency and high-low cycle protection" test module, select the "action frequency" test item of the "low-cycle protection" test object;
Set up the
Switch to the "action frequency" test interface and set the test data
Setting value
Set according to the protection order or the protection actual setting. This setting only plays a reference role during the test and does not affect the test results.
Action frequency test range
The Test start value must be greater than the protection setting frequency, and the Test End value must be less than the setting frequency. "Change step" depends on the accuracy requirements of the test, generally the default 0.05Hz setting is ok.
Df/DT value during the test
Refers to the uniform frequency conversion rate in the first stage of frequency decline, df/ DT value should be less than the locking value set by the protection.
Frequency conversion step
Refers to the "change step" of the second stage lattice frequency conversion, the smaller the value can make the test precision higher.
The action time
Set the action time. The interval of the second stage is equal to this value plus 0.2 seconds. If this value is set too small, the protection may not be able to operate within a frequency conversion interval, so this value should be set correctly.
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