ABB 3BHB005243R0105 KUC755AE105 (AC800F module) industrial control system automation spare parts

Description

KUC755AE105  The blocking from logic input, if enabled, can be tested as described in earlier tests for

other elements.

7.5.17.3 Underfrequency 2

 Disable all protection functions except the underfrequency 2 function.

 Verify that settings match in-service requirements. Enter/modify

settings and logic KUC755AE105 in the S4 ELEMENTS  FREQUENCY 

UNDERFREQUENCY 2 setpoints menu.

 Repeat the appropriate steps of Underfrequency 1 on page 7–44 for this

element.

 Compare the results to the settings for the underfrequency 2 element.

7.5.17.4 Overfrequency

 Disable all protection functions except overfrequency.

 Verify that settings KUC755AE105 match in-service requirements.

Overfrequency settings are modified in the S4 ELEMENTS 

FREQUENCY  OVERFREQUENCY settings menu.

Voltage input function (voltage input enabled):

Using the variable-frequency voltage/current source connected to terminals C11 and C12

for the voltage signal and H1KUC755AE105 and G1 for the current signal,

 Set the frequency to 60.00 Hz (or 50.00 Hz) and the voltage amplitude

to the rated VT secondary voltage.

 Set the current amplitude to rated CT secondary.

 Monitor the appropriate trip and auxiliary relays.

 Reset all alarms and indications on the relay.

The 745 display should remain unchanged with no trip indications.

 Slowly increase the frequency until the output relay(s) operate.

 Check that the frequency at which operation took place is the selected

frequency setting.

 As the frequency is varied, verify that the A2 METERING 

FREQUENCY  SYSTEM FREQUENCY actual value indicates the correct

value of system frequency.

 Slowly reduce the voltage.

 Note the voltage at which the output relay(s) reset.

 Check that this dropout voltage is equal to the S4 ELEMENTS 

FREQUENCY  OVERFREQUENCY  MINIMUM OPERATING

VOLTAGE voltage level.

Note that this level can be set down to 0.00 A, in which case the element

remains operated to a voltage KUC755AE105 level of approximately 2% of nominal.

 Slowly increase the voltage and check that the element operates when

the voltage reaches 2% above the set level.

 Return the voltage to nominal value.

 Slowly decrease the current until the element resets.

 Check that this dropout current level is equal to the S4 ELEMENTS 

FREQUENCY  OVERFREQUENCY  MINIMUM OPERATING

CURRENT setting.

If current sensing has not been enabled for this element, the element

remains operated for current levels down to 0.00 A.

 Slowly increase the current and check that the element operates when

the current reaches a value just above the setting.

 Set the current to rated CT secondary.

 Check that the Trip and Pickup LEDs are on and one of the following

trip messages is displayed:

LATCHED: Overfrequency or OPERATED: Overfrequency

 Slowly decrease the frequency until the Pickup LED and output relays

reset.

 Note the dropout level, which should be the pickup minus 0.03 Hz.

Check that the Trip LED is still on.

The trip message remains on if the OVERFREQUENCY TARGET setting is

“Latched”; if set to “Self-resetting”, the message resets when frequency

is below the setpoint.

For timing tests, the signal generator must be capable of triggering into step-wise

changing of frequency or ramping down to a pre-selected frequency in only a few

milliseconds.

 Connect the signal source and timer start triggers as shown in FIGURE

7–12: Frequency element testing on page 7–44.

 Set the voltage to rated VT secondary value, the current to rated CT

secondary, and the pre-trigger frequency to nominal frequency (60 or 50

Hz).

The current signal is not required if current sensing is not enabled for

this element.

 Set the post-trigger to 0.5 Hz above the setting of the overfrequency

element. If necessary, reset all targets and relays.

 Reset the timer.

 Initiate the frequency step and timer start.

The interval timer records the operating time of element.

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