3UG3501 datasheet(80/114 Pages) ETC2

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Monitoring Relays

3UG Monitoring Relays for Electrical and Additional Measurements

Insulation monitoring

for ungrounded DC networks

7/80

Siemens LV 1 T · 2006

■Overview

Relay for monitoring the insulation resistance between

ungrounded pure DC networks and a protective-ground

conductor:

• Measuring principle for differential current measurement

• Response threshold can be set continuously from

10 to 110 k

• Selectable

- Auto reset function with hysteresis or

- Storage of the tripping operation

• Front selector switch for open-circuit and closed-circuit

principle for the output relay

• Test function with test buttons on the front for L+ and L-

and over terminal connections

• Switching output: 1 CO contact

• Insulation fault indicator for L+ and L- through two red LEDs

• 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 voltage between

the positive and negative supply voltage in an ungrounded DC

network and a corresponding protective conductor.

The measurement is based on the DC residual current

measurement principle. The response value can be adjusted

steplessly in the range from 10 to 110 k

W and thus can be

adapted to the corresponding conditions. If the insulation

resistance falls below the set response value, the output relay

triggers (depending on the setting of the open/closed-circuit

principle selector switch) and a fault LED lights up.

A ground fault is evaluated separately for L+ and L- and

indicated by means of a corresponding LED.

Note:

Due to the measurement principle, a symmetrical ground fault on

terminals L+ and L- cannot be evaluated.

Test function

A ground fault can be simulated using the Test L+ and Test L-

buttons on the front. If the test button is pressed for at least 1 s,

the status of the output relay changes and the corresponding

fault LED lights up.

An external test button can be connected to terminals Y1-Y3 for

L+ and terminals Y4-Y3 for L-. The function is triggered by

means of a NO contact.

Fault storage and RESET

If terminals Y2 and Y3 are linked, the monitoring relay is set to

fault storage mode.

If the insulation resistance falls below the set value, the output

relay triggers (depending on the setting of the open/closed

circuit selector switch), and stays in this state even if the

insulation resistance rises again above the hysteresis value

(typical: 2 times the set value). This fault storage can be deleted

by pressing and releasing the L+ RESET button, opening the

Y2-Y3 connection or by switching off the supply voltage.

Open/closed-circuit principle selector switch

The function principle of the output relay can be adjusted by

means of a selector switch on the front panel.

If the relay is to respond in the event of a fault (contact symbol

open), the open-circuit principle must be selected. If the relay

however is to trigger in the event of a fault (contact symbol

closed), the closed-circuit principle must be selected.

Note:

The position of the selector switch has no effect upon the fault

LEDs. The LEDs always light up if the insulation resistance on L+

or L– falls below the set value.

A 1 / A 2

Y 3 / Y 4

1 1 / 1 4

1 1 / 1 2

N S B 0 _ 0 1 3 9 5

R v a l u e

Y 1 / Y 3

Y 2 / Y 3

L + / P E

L - / P E

T e s t >

T e s t

H y s t

R H y s t

O p e n -

c i r c u i t /

c l o s e d -

c i r c u i t

p r i n c i p l e

= a p p r o x . 1 s

= t y p i c a l l y 2 x R

= S u p p l y v o l t a g e

= B u t t o n o n f r o n t -

R e s e t L + a n d L - /

T e s t L +

= B u t t o n o n f r o n t - T e s t L -

T e s t r e m o t e c o n n e c t i o n -

T e s t L -

= T e s t r e m o t e c o n n e c t i o n -

T e s t L +

= T e s t r e m o t e c o n n e c t i o n -

S t o r e , r e s e t

= I n s u l a t i o n r e s i s t a n c e R

o f s u p p l y

s e t r e s p o n s e v a l u e R

= S w i t c h o n f r o n t

O p e n - c i r c u i t /

c l o s e d - c i r c u i t p r i n c i p l e

= N O c o n t a c t

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