Communication-capable Circuit Breakers

WL Circuit Breaker

The extended protective relay functions of the metering function can monitor the following criteria and initiate a trip if values are exceeded.

Protective Relay Function

ANSI Device Number

Setting range

Possible delay

Current unbalance

46

5 ...

50%

0 ...

15 s

Total harmonic distortion - current

81THDC

5 ...

50%

5 ...

15 s

 

 

 

 

 

 

Voltage unbalance

47

5 ...

50%

0 ...

15 s

 

 

 

 

 

 

Undervoltage

27

100

... 1100V

0 ...

15 s

 

 

 

 

 

 

Overvoltage

59

200

... 1200V

0 ...

15 s

Total harmonic distortion - voltage

81THDV

5 ...

50%

5 ...

15 s

 

 

 

 

 

 

Direction of phase rotation

47N

-

 

-

 

 

 

 

 

 

 

Active power in normal direction

32

13 ...

4000kW

0 ...

15 s

 

 

 

 

 

 

Active power in reverse direction

32R

13 ...

4000kW

0 ...

15 s

Under frequency

81U

40 ...

70 Hz

0 ...

15 s

 

 

 

 

 

 

Over frequency

81O

40 ...

70 Hz

0 ...

15 s

Table 2-8Additional trip criteria can be set using the extended protective relay functions. A delay time can be set to prevent transient events from causing nuisance trips: the circuit breaker will not trip unless the condition is present for longer than the delay time.

The metering function supplies the following Alarm Setpoint Functions:

Alarm Function

Setting range

Possible delay

Over current

30 ...

10000A

0 ...

255 s

Over current - ground fault

30 ...

10000A

0 ...

255 s

Over current - N-conductor

30 ...

10000A

0 ...

255 s

 

 

 

 

 

Phase unbalance - current

5 ...

50%

0 ...

255 s

Demand - current

30 ...

10000A

0 ...

255 s

Total harmonic distortion - current

5 ...

50%

5 ...

255 s

Undervoltage

15 ...

1200V

0 ...

255 s

Overvoltage

200

... 1200V

0 ...

255 s

Phase unbalance - voltage

5 ...

50%

0 ...

255 s

Total harmonic distortion - voltage

5 ...

50%

5 ...

255 s

Crest factor

1 ...

3,000

0 ...

255 s

Form factor

1 ...

3,000

0 ...

255 s

 

 

 

 

 

Active power in normal direction

13 ...

10000kW

0 ...

255 s

Active power in reverse direction

13 ...

10000kW

0 ...

255 s

Leading power factor

0 ...

-0.99

0 ...

255 s

 

 

 

 

 

Lagging power factor

0 ...

0.99

0 ...

255 s

 

 

 

 

Demand - active power

-10000 10000kW...

0 ...

255 s

 

 

 

 

 

Apparent power

13 ...

10000kVA

0 ...

255 s

 

 

 

 

 

Reactive power in normal direction

13 ...

10000kvar

0 ...

255 s

 

 

 

 

 

Reactive power in reverse direction

13 ...

10000kvar

0 ...

255 s

 

 

 

 

 

Demand - apparent power

13 ...

10000kVA

0 ...

255 s

 

 

 

 

 

Demand - reactive power

13 ...

10000kvar

0 ...

255 s

 

 

 

 

 

Underfrequency

40 ...

70 Hz

0 ...

255 s

 

 

 

 

 

Overfrequency

40 ...

70 Hz

0 ...

255 s

Table 2-9Alarm and setpoint functions allow events to be generated when system conditions deviate from their nominal values. The generation of the events can be delayed to prevent transient conditions from “chattering”. These alarms are communicated via CubicleBUS and can cause output contacts to close in the configurable output module and can freeze the waveform buffer in the metering function. Alarms are communicated to the COM16/15 where they can be transmitted to the master.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL1066, UL 489 specifications 81THDC

UL 489, UL1066 specifications

Siemens UL1066 and UL489 are essential components in the landscape of electrical equipment, specifically in circuit protection and control. These standards ensure reliability, safety, and efficiency in various applications, including industrial, commercial, and residential settings.

The Siemens UL1066 is primarily focused on disconnect switches. These devices are designed to isolate electrical circuits, ensuring the safety of both personnel and equipment during maintenance or in case of faults. One of the key features of UL1066 disconnect switches is their high breaking capacity, enabling them to handle significant fault currents without failure. This characteristic is crucial in protecting downstream equipment from damage caused by short circuits. The UL1066 switches are also known for their robust construction, often featuring a metal enclosure that enhances durability and environmental resistance. Additionally, these switches can be operated manually or remotely, offering flexibility in operation and control.

On the other hand, Siemens UL489 circuit breakers provide comprehensive protection against overcurrents and short circuits. These devices not only interrupt fault currents but also protect connected devices from damage due to overload situations. Key features of UL489 circuit breakers include adjustable trip settings, which allow users to customize the response to overcurrent conditions based on specific application requirements. This adaptability makes them suitable for a wide range of environments, from large industrial plants to smaller commercial buildings.

Both UL1066 and UL489 products are constructed with advanced technologies, such as thermal-magnetic or electronic trip mechanisms in UL489 devices, ensuring precise and timely interruption of fault currents. These technologies promote energy efficiency and stability within electrical systems. In addition, many of these devices are equipped with indication features, providing clear visual status cues for quick assessment in emergency situations.

In terms of characteristics, both UL1066 and UL489 devices adhere to rigorous testing and certification processes to meet UL standards. This compliance assures users of their performance and reliability. Furthermore, the devices are designed to accommodate a wide range of operating temperatures and environmental conditions, making them versatile choices for various applications.

In summary, Siemens UL1066 and UL489 devices are paramount in ensuring safety and efficiency in electrical circuits. Their advanced features and robust construction make them indispensable in protecting both personnel and equipment in an array of industrial and commercial applications.