Automatic Ct Detection Procedure; Manual Ct Detection Procedure; Step 6: Before Starting The Filter - Hitachi PQF Quick Start Up Manual

Power quality filter

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Figure 23: Basic CT configuration in the case of a multi-unit filter arrangement

5.5.2.

Automatic CT detection procedure

The filter injects a small amount of current and detects the CT ratio through the feedback circuit. In most of the cases,

the CT ratios are correctly detected and stored as the installation parameter. Under certain circumstances, the auto-

matic CT detection does not work. In such cases, the CT ratio needs to be entered manually.

NOTE: When the automatic CT detection procedure is started, the filter will automatically deactivate all user

requirements for filtering, reactive power compensation and balancing. After the procedure has finished, the

user has to reprogram these parameters into the filter.

5.5.3.

Refer to the Chapter 4 of the detailed manuals for guidelines on how to enter data when using the manual CT setup.

The following procedure will allow you to check the CT connection. This step only has to be executed if the CT setup

could not be detected automatically. For filters consisting of more than one unit, it is necessary to check the CT con-

nections for each individual unit.

Before switching the filter ON, ensure that all harmonics and reactive power compensation/balancing options have

been deselected.

– For deselecting all harmonics of the main filter settings at once go to [/Welcome/Settings/Customer set./Main set-

tings/Deselect all].

– For deselecting all harmonics of the auxiliary filter settings at once go to [/Welcome/Settings/Customer set./Auxil-

iary settings/Deselect all].

– For deselecting the reactive power compensation option of the main filter settings disable the option 'PFC type' in

[/Welcome/Settings/Customer set./Main settings/Main PFC/Bal.].

– For deselecting the load balancing option of the main filter settings disable the option 'Balance load' in [/Wel-

come/Settings/Customer set./Main settings/Main PFC/Bal.].

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