Siemens SG8158-00 manual High-Set Instantaneous Phase Overcurrent 50HS

Protective Function Configuration

5

5.3High-Set Instantaneous Phase Overcurrent (50HS)

The High-Set Instantaneous Phase Overcurrent function causes an undelayed trip when any individual measured phase current exceeds the preprogrammed threshold (pickup value). The relay will trip at 100% of the set pickup point.

A1500	High-SetInstantaneous Phase Overcurrent (50HS)
Address	Parameter	Option
1551	Function	Enabled or Disabled
1552	Pickup	5A	CTs: 5-120 A or
		1A	CTs: 0.2-24 A
		(0.1 A steps)
1560	Freeze Wfm1	on Trip, or None
1561	Freeze Wfm2	on Trip, or None

The Instantaneous Neutral or Ground Overcurrent function can be enabled or disabled (1601). The form of protection provided depends on the manner in which the external CTs are connected to the ISGS relay. Figure 4.5 in Chapter 4 shows correct CT connections and polarities.

The range of the pickup value (1602) depends on the sec- ondary neutral CT rating (1 A or 5 A) and the value is in sec- ondary amperes.

The time delay (1604) represents the time between pickup and trip and can be adjusted from 0 to 60 seconds in steps of 0.1 second. If the function remains in pickup for longer than the time delay, this parameter causes a trip. The delay can also be set to infinity so that the function never times out.

Each of the two waveform capture buffers (1610 and 1611) can be independently programmed to freeze snapshots on pickup or trip.

The function can be enabled or disabled (1551). The range of the pickup value (1552) depends on the secondary phase CT rating (1 A or 5 A) and the value is in secondary amperes.

Each of the two waveform capture buffers (1560 and 1561) 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.

5.4Instantaneous Neutral or Ground Overcurrent (50N)

The Instantaneous Neutral or Ground Overcurrent function has an adjustable delay whose input is the current measured by the neutral CT. It begins timing when the neutral or ground current exceeds the pickup value. The ISGS relay will pickup at 100% of set pickup point and drop out at 95% of the pickup point.

A1600	Instantaneous Neutral or Ground Overcurrent
	(50N)
Address	Parameter	Option
1601	Function	Enabled or Disabled
1602	Pickup	5 A CTs: 1-120 A or
		1 A CTs: 0.2-24 A
		(0.1 A steps)
1604	Time Delay	0-60 s (0.01 s steps)
1610	Freeze Wfm1	on Pickup, on Trip, or None
1611	Freeze Wfm2	on Pickup, on Trip, or None
1612	Blocked by	None, 50HS & 50HSN, 50HSN,
		or 50HS

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

5.5High-Set Instantaneous Neutral or Ground Overcurrent (50HSN)

The High-Set Instantaneous Neutral or Ground Overcurrent function causes an undelayed trip when any individual mea- sured phase current exceeds the preprogrammed threshold (pickup value). The relay will trip at 100% of the set pickup point.

A1600	High-Set Instantaneous Neutral or Ground
	Overcurrent (50HSN)
Address	Parameter	Option
1651	Function	Enabled or Disabled
1652	Pickup	5 A CTs: 5-120 A or
		1 A CTs: 0.2-24 A
		(0.1 A steps)
1660	Freeze Wfm1	on Trip, or None
1661	Freeze Wfm2	on Trip, or None

The High-Set Instantaneous Neutral or Ground Overcurrent function can be enabled or disabled (1651).

The range of the pickup value (1652) depends on the sec- ondary phase CT rating (1 A or 5 A) and the value is in sec- ondary amperes.

Each of the two waveform capture buffers (1660 and 1661) 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.

22 Siemens Energy & Automation, Inc.