Toshiba GR200 Series Instruction Manual page 1273

Line differential protection ied

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10.2.15 Current transformer failure (CT fail)

Detecting the failure in the CT is achieved by the operation of the CT failure detection function

(CTF†). Thus, the failure signal in the CTF is transferred to the automatic supervision function

and it is grouped into the error level together with other error signals.

†Note: For more information about the CTF function, see Chapter

failure detection

Generally, the default error level has been set at level 3 (Minor error), but the user can program

the level using setting [CHK_CTF:LVl]; then, set On for the setting [CHK_CTF:Sw]. The

manufacturer sets ten (10) seconds to detect the failure; it is reset instantly when the failure

Error message

When the function operates and detects error, an error message can be shown at the LED and

the LCD screen.

Table 10.2-31 Error messages provided by the supervisor in CHK_CTF

Message and level

Table 10.2-32 Detailed information in Hexadecimal in CHK_CTF

Display area

Meaning of the information

Detection of the failure in the CT

Minor error (Level 3)

Meaning of the detailed information

(No information is displayed)

6F2S1914 (0.49)

Relay application: CT

GRL200 (Soft 033 & 037)

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