Siemens SG8158-00 manual Negative Sequence Voltage 47N, Phase Sequence Voltage

Protective Function Configuration

The Undervoltage function can be enabled or disabled (2301).

The Curve parameter (2302) allows the selection of a definite time delay or a characteristic curve. When the definite time characteristic is selected, the time delay begins as soon as the device goes into pickup. The inverse time characteristic utilizes a moderate inverse curve using the time dial.

The Pickup Source Voltage parameter (2303) indicates the VT connection. If the VTs are connected line-to-ground, the device can pickup on line-to-line or line-to-ground voltages. If the VTs are connected line-to-line, the VTs can only pickup on line-to-line voltages. The maximum continuous voltage across a VT input is 150 VAC.

The pickup value (2304) is in secondary volts ranging from 60 to 250 V. The function begins timing when any individual phase voltage exceeds the pickup voltage setting.

The time delay (2305) represents the time between pickup and trip and can be set when definite time is selected. The delay can be adjusted from 0.1 to 60.0 seconds in steps of

0.01second. If the function remains in pickup for longer than the time delay, the function causes a trip. The delay can also be set to infinity so that the function never times out.

The Time Dial parameter (2306) is used for the characteristic curve. The dial allows the time-to-trip of the curve to be raised or lowered. It can be adjusted from 0.1 to 9.9 in steps of 0.1.

Each of the two waveform capture buffers (2310 and 2311) can be independently programmed to freeze snapshots on pickup or trip.

The 47 Phase Sequence Voltage function can be enabled or disabled (2401).

Each of the two waveform capture buffers (2410 and 2411) can be independently programmed to freeze snapshots on trip.

The function is able to actuate any binary output contact on pickup, and any trip or binary output contact on trip.

5.14 Negative Sequence Voltage (47N)

The Negative Sequence Voltage function operates when the percent negative sequence voltage exceeds the preset value for a specified time. This function resets instantaneously when the negative sequence voltage drops below pickup.

A2400	Negative Sequence Voltage (47N)
Address	Parameter	Option
2451	Function	Enabled or Disabled
2452	Curve	Definite or Inverse
2453	Pickup	4-40% negative sequence
		(1% steps)
2454	Time Delay (Def.)	0-100 s (0.01 s steps),
		or infinity
2455	Time Dial (Inverse)	0.1-9.9 (0.1 steps)
2456	Max Time (Inverse)	1-250 s (1 s steps)
2457	Blocked at	40-120 V (1 V steps)
2460	Freeze Wfm 2	on Pickup, on Trip, or None
2461	Freeze Wfm 2	on Pickup, on Trip, or None

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The function is able to actuate any binary output contact on pickup, and any trip or binary output contact on trip.

5.13 Phase Sequence Voltage (47)

The Phase Sequence Voltage function operates instanta- neously if the correct system voltage phase sequence defined in the hardware configuration is not present at the device voltage inputs. This function will not respond if the input to the device is less than 40 V line-to-line or 23.1 V line- to-neutral. The function operates without delay or inverse time characteristic. It responds in 100 ms or less.

The Phase Sequence Voltage function can be used to pre- vent closure of a breaker. The assigned output contact would be wired to open a contact in the breaker-close circuit and remain activated until the line rotation is normal.

A2400	Phase Sequence Protection (47)
Address	Parameter	Option
2401	Function	Enabled or Disabled
2410	Freeze Wfm 1	on Trip, or None
2411	Freeze Wfm 2	on Trip, or None

The Negative Sequence Voltage function can be enabled or disabled (2451).

The Curve parameter (2452) allows the selection of a definite time delay or an inverse curve. The inverse time characteris- tic utilizes a moderate inverse curve using the time dial.

The pickup value (2453) ranges from 4% to 40% of negative sequence voltage. The function begins timing when the per- cent of negative sequence voltage exceeds the preset value for a specified time.

The time delay (2454) represents the time between pickup and trip and can be set when definite time is selected. The delay can be adjusted from 0 to 100 seconds in steps of

0.01second. The delay can also be set to infinity so that the function never times out.

The Time Dial parameter (2455) is used for the characteristic curve. The dial allows the time-to-trip of the curve to be raised or lowered. It can be adjusted from 0.1 to 9.9 in steps of 0.1.

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