8.2. Protection. Entec ETMFC610

Multi-Function Control ETMFC610

8.2. Protection

http://www.entecene.co.kr

Place the curser on “PROTECTION” in GROUP# menu, press [ENT] button to move into this menu. This menu sets the protection elements that operate when the protection control type(PROTYPE) is set.

[RECLOSER]

>1.TIME OC-PHA

2.TIME OC-GND

3.TIME OC-NEQ

4.INST OC-PHA

5.INST OC-GND

6.INST OC-SEF

7.INST OC-NEQ

> 8.INRUSH RESTRAINT

9.USER CURVE

Protection Elements - ANSI Designations

In case of Protection control type, the protection elements are as follows;

Table 8-1. Protection Elements -ANSI Designations

Protective Elements

Phase time overcurrent

ANSI

Designations

51P

LCD Menu

GROUP SETTING / ... / PROTECTION / TIME OC-PHA

Ground time overcurrent

Negative sequence time overcurrent

Phase instantaneous overcurrent

Ground instantaneous overcurrent

Sensitive Earth Fault protection

Negative sequence instantaneous overcurrent

Inrush restraint

Cold load pickup

Phase directional time control

Ground directional time control

Sensitive Earth Fault directional time control

Negative sequence directional time control

51G

51Q(46)

50P

50G

50SG

GROUP SETTING / ... / PROTECTION / TIME OC-GND

GROUP SETTING / ... / PROTECTION / TIME OC-NEQ

GROUP SETTING / ... / PROTECTION / INST OC-PHA

GROUP SETTING / ... / PROTECTION / INST OC-GND

GROUP SETTING / ... / PROTECTION / INST OC-SEF

50Q(46)-1 GROUP SETTING / ... / PROTECTION / INST OC -NEQ

CLPU-1 GROUP SETTING / ... / PROTECTION / INRUSH RESTRAINT

CLPU-2

67P

67G

67SG

67Q

GROUP SETTING / ... / COLD LOAD PICKUP

GROUP SETTING / ... / DIRECTION / PHASE

GROUP SETTING / ... / DIRECTION / GROUND

GROUP SETTING / ... / DIRECTION / SEF

GROUP SETTING / ... / DIRECTION / NEG SEQ

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Multi-Function Control ETMFC610 http://www.entecene.co.kr

Protection Elements Block Diagram - ANSI Designations

Figure 8-6.

Protection Elements Block Diagram

All overcurrent protection function consist of dual-elements ((+) and (-)) of individual operations.

It can be operated in several ways depending on the configuration of the line system and the user's request. Several application example of dual overcurrent protection elements are as follows;

1) Ring Line System Application

By using directional elements and dual overccurent protection elements ((+) and (-)), it is possible to protect simultaneously both sides of the source line on ring line system operation. After setting the directional type as forward, when using the dual-elements (function is set to ENABLE), The (+) element does fault protection about the forward direction and the (-) element does the fault protection about the reverse direction.

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Multi-Function Control ETMFC610 http://www.entecene.co.kr

The (+) element operates as the setting type of the directional element, and the (-) element operates as the opposite direction to the setting type of the directional element. If the type of the directional element is set as NONE, the (+) and (-) elements operate simultaneously regardless of the direction of the fault.

Figure 8-7.

Ring Line System Application

2) Radial Line System Application

When working in a radial line system, the directional element does not work and only one of the

(+) or (-) elements is used. ((+) element is recommended)

Figure 8-8.

Radial Line System Application

3) Overcurrent Alarm elements Application

In the case of time overcurrent function, each element can be used for trip or alarm purposes. Thus, one of the dual overcurrent protection elements can be operated as the trip element and another one is operated as the alarm element.

EN HANCED TEC HNOLOGY 194