Power workers in the work, need to use microcomputer relay protection tester, to test power transformers, relays and other high voltage power equipment, balance coefficient is an important parameter need to be set up before the test, this article to explain.
General microcomputer relay protection tester, can choose four Settings: direct set the balance coefficient (generally choose this), by the rated voltage and CT ratio calculation, by a rated current calculation, by the second rated current calculation. If you choose different setting methods, the contents displayed and calculated in the parameter table above are different, which are explained as follows:
Directly set the balance coefficient: Only the Balance coefficient and secondary rated current A can be set. The balance coefficient of high and low pressure sides can be set directly. You can also directly set the secondary rated current when selecting Standard Current from the Constant Type drop-down list. The modification of the secondary rated current does not affect other parameters, such as the value of the primary rated current. When you select Named Current from the Constant Type drop-down list, the secondary rated current does not affect the test.
Calculation by rated voltage and CT ratio: the software automatically calculates the balance coefficient and primary and secondary rated current of high and low voltage sides according to the set capacity, voltage and CT ratio. When the capacity and voltage parameters are modified, the primary and secondary rated current and balance coefficient will be recalculated. If only CT ratio parameters are modified, only secondary rated current is affected. When "Standard current" is selected from the "Constant value Type" drop-down menu, the software will directly call the current calculated secondary rated current.
Calculated by primary rated current: At this time, parameters of primary rated current A and CT ratio are open. The software directly calculates the balance coefficient of high and low voltage sides from the set primary rating, and calculates the secondary rated current from the above two parameters, which can be called when "standard current" is selected from the "Fixed value Type" drop-down menu. This option is only suitable for a small part of protection where the primary rated current is used to calculate the balance coefficients of the high and low voltage sides, since most protection uses the secondary rated current to calculate the balance coefficients of the high and low voltage sides.
Calculated by secondary rated current: Only secondary rated current A is enabled. By modifying this parameter, the equilibrium coefficients of high and low pressure sides can be calculated directly. This parameter can also be invoked directly when the Value current is selected from the Value Type drop-down list.
The balance coefficient setting of microcomputer relay protection tester is often used in the process of using a setting method, power workers need to master, in order to get the correct test results in the actual work.
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