PFEA111-20 original guarantee ABB equipped with optical disc tension controller PLC system spare parts

Description

PFEA111-20 Provided that the operate times are not scattered over a wide range, it may be desirable to

repeat this test several times and average the results.

If there is a wide scatter, verify the test PFEA111-20setup and ensure the signal source behaves in a

consistent manner.

Current input function (voltage input disabled):

PFEA111-20 If the voltage input is disabled, the frequency elements use the winding 1 phase A current

signal as a source. Verify the operation of the element using the procedure below.

 Using the variable-frequency current source connected to terminals H1

and G1, no voltage connections, frequency at 60.00 Hz (or 50.00 Hz),

and the amplitude to rated CT secondary current.

 Monitor the appropriate trip and auxiliary relays.

 Reset all relay alarms and PFEA111-20 indications.

The relay 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.

 Slowly reduce the current.

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

 Check that this dropout current is the minimum operating current

selected in the settings.

If current sensing has been PFEA111-20 disabled for this element, then operation

continues down to 0.00 A.

 Increase the current back to nominal.

 Check that the relay(s) operate.

 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 turns on 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 stays on if the OVERFREQUENCY TARGET setting is

Latched; if it is 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 current to rated CT secondary value, no voltage connection, and

the pre-trigger frequency to the nominal frequency (60 or 50 Hz).

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

element.

 Reset all targets and relays, if necessary.

 Reset the timer.

 Initiate the frequency step and timer start.

The Interval Timer records the element operating time.

 Compare this time to the S4 ELEMENTS  FREQUENCY 

OVERFREQUENCY  OVERFREQUENCY DELAY setting:

Provided that the operate times are not scattered over a wide range, it may be desirable to

repeat this test several times and average the results.

If there is a wide scatter, verify the test setup and ensure the signal source behaves in a

consistent manner.

Note

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

other elements.

7.5.17.5 Frequency Decay Rate

Note

A high-quality programmable function generator is required to verify this element. Since

the frequency rates of change are measured over a narrow range, the test

instrumentation must accurately simulate frequency decay rates without any significant

jitter. It is the experience of GE Multilin that some commercial dedicated relay test

equipment with built-in frequency ramping functions is not accurate enough to verify the

745 performance.

 Disable all protection functions except the Frequency Decay function.

 Verify that settings match in-service requirements.

The settings are entered and modified in the S4 ELEMENTS 

FREQUENCY  FREQUENCY DECAY setpoints menu.

The following procedures are for the frequency decay rate 1 element. They can be applied

to the frequency decay rate 2, 3, and 4 elements as well, making the necessary changes

where appropriate.

Voltage input function (voltage input enabled):

 Use a frequency-ramping programmable voltage/current source

connected to terminals C11 and C12 for the voltage signal and H1 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 (Note: if current

sensing is disabled for this element, the current signal is not required for

the tests).

 Monitor the appropriate trip and auxiliary relays.

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