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FUNCTION CHARACTERISTICS

The ﬁrst threshold trip (U<) may be inhibited by start of the second threshold (U<<) by setting ON

the U< Disabling by U<< start (U<disbyU<<) parameter available inside the Set \ Proﬁle A (or B) \

Undervoltage-27 \ U<< Element \ Setpoints menu.

User can disable both 27 protection thresholds from the keyboard. During this command, the trip

output relay (U <and / or U << thresholds) are forced to reset state, the message “27 Disabled” is

displayed and all LEDs blink until the end of the command.

Breaker failure (BF)

Each thresholds ( U <, U <<) can be associated to BF (H) and BF (L) protection by activating the rel-

ative parameter in the matrices “Selection of function tripping for BF (H)” or “Selection of function

tripping for BF (L)” in relevant BF menus

[1]

• Set \ Proﬁle A (or B) \ Breaker failure - BF side H

• Set \ Proﬁle A (or B) \ Breaker failure - BF side L

VT monitoring (74VT)

Both the protection elements are blocked off whenever the VT supervision function is active, so

that no unwanted trip can arise if any fault on the VTs secondary circuits (break, fuse trip, etc)

are detect;

[2]

the Block functions enable from 74VT parameter 74VT-BK-ENis available inside the

Set \ VT supervision -74VT.

For every of the two elements the logic block is available:

Logical block (Block1)

If the U<BLK1and/orU<<BLK1 enabling parameters are set to ON and a binary input is designed

for logical block (Block1), the protection is blocked off whenever the given input is active.

The trip timer is held in reset condition, so the operate time counting starts when the input block goes

down.

[3]

The enabling parameters are available inside the Set \ Proﬁle A (or B) \ Undervoltage - 27

\ U< Element (U<< Element) \ Setpoints menus, while the Block1 function must be assigned to the

selected binary input inside the Set \ Board1(2) inputs \ Binary input IN1-1...INx-x menus.

All parameters can be set separately for A and B setting proﬁles

Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.

Note 2 The exhaustive treatment of the VT supervision function may be found in the “VT supervision - 74VT” paragraph inside CONTROL AND MONI-

TORING section.

Note 3 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside CONTROL AND MONITOR-

ING section.

all-F27.ai

U< Element

U<< Element

MMI

Start U<<

Start U<

Trip U<

Trip U<<

U< disbyU<<

U< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< Curve U< Enable State

Block1

BLK1U<

U<BLK1

Start U<

Block1

BLK1U<<

U<<BLK1

Start U<<

74VT

AND

Common conﬁguration

Utype27

Disable 27-37-81 functions by operator

Logic27

General logic diagram of the undervoltage elements - 27

XMR-D EQUIPMENT MANUAL

Ed. 2.9 - 02/2021

Brand	Thytronic
Model	XMR-V 4V
Category	Protection Device
Language	English

Thytronic XMR-V 4V User Manual

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