3UG3501 datasheet(78/114 Pages) ETC2

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Monitoring Relays

3UG Monitoring Relays for Electrical and Additional Measurements

Insulation monitoring

for ungrounded AC networks

7/78

Siemens LV 1 T · 2006

■Overview

Relay for monitoring the insulation resistance between the

ungrounded single or three-phase AC supply and a protective

ground conductor:

• Measuring principle with superimposed DC voltage

• Two selectable measuring ranges of 1 ... 110 k

• Stepless setting within the measuring range

• Selectable:

- Auto reset function with fixed hysteresis or

- Storage of the tripping operation

• Test function with test button and terminal connections on the

front

• Switching output: 1 CO contact

• Insulation fault indication with a red LED

• Supply voltage indication with a green LED

• Electro-magnetically compatible according to EN 50081 and

EN 61000-6-2.

■Function

The monitoring relay measures the insulation resistance

between the ungrounded AC supply and an associated

protective ground conductor.

A superposed DC measuring voltage is used to perform the

measurement.

The monitoring relay is divided into two ranges for an insulation

resistance range from 1 to 100 k

W. A range switch on the front

can be used to switch over between a 1 to 11 k

W range and a

10 to 110 k

W range. Within the selected range, the monitoring

relay can be steplessly adapted to the respective insulation

conditions.

If the insulation resistance undershoots the set threshold, the

output relay is excited and the red LED (fault display) is lit.

If the insulation resistance exceeds 1.6 times (corresponding to

60 % hysteresis) the set threshold, the output relay will return to

the rest position.

Test functions

The "Test" button on the front can be used to simulate a ground

fault. If the "Test" button is pressed for at least 300 ms, the output

relay is energized and the fault LED lights up. An external test

button can be connected to terminal Y1. The function is

activated by closing (> 300 ms).

Fault storage and RESET

If terminals Y1 and Y2 are jumpered, the monitoring relay is set

to fault storage mode. If the set insulation resistance is under-

shot, the output relay is excited and remains tripped even after

the insulation resistance rises above 1.6 times the set value

again. Fault storage can be reset by briefly pressing the RESET

button, briefly jumpering (< 300 ms) the Y1 and PE/ground

terminals or by switching off and on the supply voltage.

Note:

The monitoring relay is designed for AC supply systems.

Series-connected rectifiers must be galvanically isolated from

the measuring relay that is to be monitored.

A1/A2

A1/B2

Y1/Y2

Y1/PE

11/14

11/12

value

Rvalue

Test

NSB0_01393

Test

= > approx. 300 ms

= Supply voltage

A1-B2/A1-A2 for

115 V/230 V AC

A1-A2 for 24 ... 240 V AC/DC

= Remote connection-

save-reset

= Key on the front -

test/reset

= Insulation resistance R

of network

Set operating value R

= NO contact

1.6 x R

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