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Monitoring Relays

Siemens · 2010

3UG Monitoring Relays for Electrical and Additional Measurements

Line monitoring

■

Overview

Solid-state line monitoring relays provide maximum protection

for mobile machines and plants or for unstable networks. Net-

work and voltage faults can be detected early and rectified be-

fore far greater damage ensues.

Depending on the version, the relays monitor phase sequence,

phase failure with and without N conductor monitoring, phase

unbalance, undervoltage or overvoltage.

Phase unbalance is evaluated as the difference between the

greatest and the smallest phase voltage relative to the greatest

phase voltage. Undervoltage or overvoltage exists when at least

one phase voltage deviates by 20 % from the set rated system

voltage or the directly set limit values are overshot or undershot.

The rms value of the voltage is measured.

With the 3UG46 17 or 3UG46 18 relay, a wrong direction of rota-

tion can also be corrected automatically.

■

Function

3UG45 11 monitoring relays

The 3UG45 11 phase sequenced relay monitors the phase se-

quence in a three-phase network. No adjustments are required

for operation. The device has an internal power supply and

works using the closed-circuit principle. If the phase sequence

at the terminals L1-L2-L3 is correct, the output relay picks up af-

ter the delay time has elapsed and the LED is lit. If the phase se-

quence is wrong, the output relay remains in its rest position.

Note:

When one phase fails, connected loads (motor windings,

lamps, transformers, coils, etc.) create a feedback voltage at the

terminal of the failed phase due to the network coupling. Be-

cause the 3UG45 11 relays are not resistant to voltage feedback,

such a phase failure is not detected. Should this be required,

then the 3UG45 12 monitoring relay must be used.

Correct phase sequence

Wrong phase sequence

3UG45 12 monitoring relays

The 3UG45 12 line monitoring relay monitors three-phase net-

works with regard to phase sequence, phase failure and phase

unbalance of 10 %. Thanks to a special measuring method, a

phase failure is reliably detected in spite of the wide voltage

range from 160 ... 690 V AC and feedback through the load of up

to 90 %. The device has an internal power supply and works us-

ing the closed-circuit principle. No adjustments are required.

When the mains voltage is switched on, the green LED is lit. If the

phase sequence at the terminals L1-L2-L3 is correct, the output

relay picks up. If the phase sequence is wrong, the red LED

flashes and the output relay remains in its rest position. If a phase

fails, the red LED is permanently lit and the output relay drops.

Note:

The red LED is a fault diagnostic indicator and does not

show the current relay status. The 3UG45 12 monitoring relay is

suitable for line frequencies of 50/60 Hz.

Phase failure

Wrong phase sequence

NSB0_01565a

11/14

L1-L2-L3

11/12

21/24

21/22

NSB0_01566a

11/14

L3-L2-L1

11/12

21/24

21/22

OFF

NSB0_01567a

11/14

L1-L2-L3L2-L3L1-L2-L3

11/12

21/24

21/22

OFF OFFON

Phase loss

LED rd

NSB0_01568a

11/14

11/12

21/24

21/22

L3-L2-L1

FLASH

Phase sequence

OFFOFF

LED rd

Summary of content (6 pages)

PAGE 1
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring ■ Overview Solid-state line monitoring relays provide maximum protection for mobile machines and plants or for unstable networks. Network and voltage faults can be detected early and rectified before far greater damage ensues. Depending on the version, the relays monitor phase sequence, phase failure with and without N conductor monitoring, phase unbalance, undervoltage or overvoltage.
PAGE 2
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring 3UG45 13 monitoring relays 3UG46 14 monitoring relays The 3UG45 13 line monitoring relay monitors three-phase networks with regard to phase sequence, phase failure, phase unbalance and undervoltage of 20 %. The device has an internal power supply and works using the closed-circuit principle. The hysteresis is 5 %. The integrated response delay time is adjustable from 0 ... 20 s and responds to undervoltage.
PAGE 3
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring 3UG46 15/3UG46 16 monitoring relays 3UG46 17/3UG46 18 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.
PAGE 4
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring ■ Technical specifications Type 3UG45 11- 3UG45 11- 3UG45 11- 3UG45 12 ..N20 ..P20 ..Q20 3UG45 13 3UG46 14 3UG46 15 3UG46 17 3UG46 16 3UG46 18 General data Rated control supply voltage Us V 160 … 260 320 … 500 420 … 690 160 … 690 Absolute limit values Rated frequency Hz 50/60 Rated power, typical • At AC 230 V • At AC 400 V • At AC 460 V W/VA W/VA W/VA 2/4 --- Width mm 22.
PAGE 5
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring 3UG45 11- 3UG45 11- 3UG45 11- 3UG45 12 ..N20 ..P20 ..Q20 3UG45 13 3UG46 14 3UG46 15 3UG46 17 3UG46 16 3UG46 18 Control circuit Load capacity of the output relay • Conventional thermal current Ith A 5 Rated operational current Ie at • AC-15 at 24 ... 400 V • DC-13 at 24 V • DC-13 at 125 V • DC-13 at 250 V A A A A 3 1 0.2 0.
PAGE 6
Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring ■ Schematics 3UG45 11-.A 3UG45 12-.A 3UG45 11-.B 3UG45 12-.