Siemens ISGS SG8158-00 User Manual download pdf (Page 32)

Protective Function Configuration

26 Siemens Energy & Automation, Inc.

The range of the pickup value (2003) depends on the sec-

ondary phase neutral CT rating (1 A or 5 A) and the value is in

secondary amperes. The function begins timing when any

individual neutral current exceeds the pickup current setting.

Note: The pickup point is 1.06 of the pickup set-

ting. Refer also to paragraph on Pickup in

Section 5.1.

The Time Dial (2005) used for the selected curve allows the

time-to-trip of the curve to be raised or lowered The dial can

be adjusted from 0.1 to 9.9 in steps of 0.1.

The Filter (2006) sets the sensing method used by the func-

tion in its pickup calculations. The rms filter uses fundamen-

tal current plus harmonics, while the fundamental filter

ignores harmonics.

Impedance (2007) sets the angle used by this function. It

determines the direction of current flow being measured and

can be set from 0 to 90 degrees. The directional characteris-

tic (line) in the complex impedance plane is shown in

Figure 5.2. The directional characteristic is always perpen-

dicular to the line impedance vector.

The sensing direction (2008) can be set to forward or

reverse. The forward setting allows the directional protection

element to pickup on fault current only in the direction of nor-

mal power flow.

Each of the two waveform capture buffers (2010 and 2011)

can be independently programmed to freeze snapshots on

pickup or trip.

The Directional Neutral or Ground Time Overcurrent function

is able to actuate any binary output contact on pickup, and

any trip or binary output contact on trip.

5.11 Overvoltage (59)

The Overvoltage function causes a trip if the rms value of any

of the line voltages exceeds a set level. This function is only

available if the voltage input option is installed.

A2200 Overvoltage (59)

Address Parameter Option

2201 Function Enabled or Disabled

2202 Curve Definite

Inverse

Moderately Inverse

Very Inverse

2203 Pickup Source V Line-to-ground

Line-to-line

2204 Pickup 60-250 V (0.1 V steps)

2205 Time Delay (Def.) 0.1-60 s (0.01 s steps),

or infinity

2205 Time Dial (Inverse) 0.1-9.9 (0.1 steps)

2210 Freeze Wfm2 on Pickup, on Trip, or None

2211 Freeze Wfm2 on Pickup, on Trip, or None

The Overvoltage function can be enabled or disabled (2201).

The Curve parameter (2202) 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 (2203) 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 (2204) 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 (2205) 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

0.01 second. 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 (2206) 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 (2210 and 2211)

can be independently programmed to freeze snapshots on

pickup or trip.

The function is able to actuate any binary output contact on

pickup, and any trip or binary output contact on trip.

5.12 Undervoltage (27)

The Undervoltage function causes a trip if the rms value of

any of the line voltages falls below a set level and can be use-

ful for capturing power quality disturbances. This function is

only available if the voltage input option is installed.

2300 Undervoltage 27

Address Parameter Option

2301 Function Enabled or Disabled

2302 Curve Definite

Inverse

Moderately Inverse

Very Inverse

2303 Pickup Source V Line-to-Neutral or Line-to-Line

2304 Pickup 40-230 V (0.1 V steps)

2305 Time Delay (Def.) 0.1-60 s (0.01 s steps),

or infinity

2305 Time Dial (Inverse) 0.1-9.9 (0.1 steps)

2310 Freeze Wfm 2 on Pickup, on Trip, or None

2311 Freeze Wfm 2 on Pickup, on Trip, or None

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