7PV datasheet(65/114 Pages) ETC2

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Monitoring Relays

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Siemens LV 1 T · 2006

3UG Monitoring Relays for Electrical and Additional Measurements

Line monitoring

3UG46 15/3UG46 16 monitoring relays

The 3UG46 15/3UG46 16 line monitoring relay has a wide

voltage range and an internal power supply. The device is

equipped with a display and is parameterized using three

buttons. The 3UG46 15 device monitors three-phase networks

with regard to phase failure, undervoltage, overvoltage and

phase sequence. The 3UG46 16 monitoring relay monitors the

neutral conductor as well. The hysteresis is adjustable from 1 to

20 V. In addition the device has two separately adjustable delay

times for overvoltage and undervoltage from 0 to 20 s in each

case. If the direction is incorrect, the device switches off

immediately. Thanks to a special measuring method, a phase

failure is reliably detected in spite of the wide voltage range from

160 to 690 V AC and feedback through the load of up to 80 %.

The 3UG46 15/3UG46 16 monitoring relay can be operated on

the basis of either the open-circuit or closed-circuit principle and

with manual or auto RESET.

With the closed-circuit principle selected

Wrong phase sequence

Phase failure

Undervoltage

Overvoltage

3UG46 17/3UG46 18 monitoring relays

The 3UG46 17/ 3UG46 18 line monitoring relay has an internal

power supply and can automatically correct a wrong direction of

rotation. Thanks to a special measuring method, a phase failure

is reliably detected in spite of the wide voltage range from 160

to 690 V AC and feedback through the load of up to 80 %. The

device is equipped with a display and is parameterized using

three buttons. The 3UG46 17 line monitoring relay monitors

three-phase networks with regard to phase sequence, phase

failure, phase unbalance, undervoltage and overvoltage. The

3UG46 18 monitoring relay monitors the neutral conductor as

well. The hysteresis is adjustable from 1 to 20 V. In addition the

device has delay times from 0 to 20 s in each case. The times

respond to overvoltage, undervoltage, phase failure and phase

unbalance. The 3UG46 17/3UG46 18 monitoring relay can be

operated on the basis of either the open-circuit or closed-circuit

principle and with manual or auto RESET.

The one changeover contact is used for warning or switching off

in the event of line faults (voltage, unbalance), the other

responds only to a wrong phase sequence. In conjunction with

a contactor reversing assembly it is thus possible to change the

direction automatically.

With the closed-circuit principle selected

Phase failure

Undervoltage

Overvoltage

Unbalance

11/14

L3-L2-L1

11/12

21/24

21/22

11/14

11/12

21/24

21/22

L1-L2-L3

L1-L2-L3-N

L2-L3

L1-L2-L3

L1-L2-L3-N

21/24

21/22

11/14

11/12

x-y

Hysteresis

Delay

x-y

21/24

21/22

11/14

11/12

Hysteresis

Delay

11/14

50 ms

11/12

21/24

21/22

L1-L2-L3

L1-L2-L3-N

L2-L3

L1-L2-L3

L1-L2-L3-N

11/14

50 ms

11/12

21/24

21/22

x-y

Hysteresis

Delay

11/14

50 ms

11/12

21/24

21/22

x-y

Hysteresis

Delay

11/14

50 ms

11/12

21/24

21/22

> Asy

0 %

Hysteresis

2 %

Delay

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