Communication-capable Circuit Breakers

WL Circuit Breaker

The metering function provides the following measured values for communication system:

Measured value

Value range

Accuracy (with direct order: circuit breaker +

 

 

 

 

trip unit + met. function or met. function Plus)1

Currents Ia, Ib, Ic, IN

30

... 8000A

± 1%

Ground-fault current Ig (measure with external G transformer)

100 ... 1200A

± 5%

 

 

 

 

Line-to-line voltages Vab, Vbc, Vca

80

... 120% Vn

± 1%

Line-to-neutral voltages Van, Vbn, Vcn

80

... 120% Vn

± 1%

Average value of phase-to-phase voltages VLLAVG

80

... 120% Vn

± 1%

Apparent power kVA per phase

13

... 8000kVA

± 2%

 

 

 

 

Total apparent power KVA

13

... 24000kVA

± 2%

 

 

 

Active power kW per phase

-8000 ... 8000kW

± 3% (power factor > 0.6)

 

 

 

Total active power kWtotal

-24000 ... 24000kVA

± 3% (power factor > 0.6)

Reactive power kvar

-6400 ... 6400kvar

± 4% (power factor > 0.6)

 

 

 

Total reactive power kvar

-20000 ... 20000kvar

± 4% (power factor > 0.6)

 

 

 

Power factor per phase

-0.6 ... 1 ... 0.6

± 0.04

 

 

 

Power factor total

-0.6 ... 1 ... 0.6

± 0.04

 

 

 

 

Demand of currents Ia, Ib, Ic

30

... 8000A

± 1%

Average demand of 3-phase current

30

... 8000A

± 1%

 

 

 

 

Demand kWD per phase

13

... 8000kW

± 3% (power factor > 0.6)

 

 

 

 

kW demand 3-phase active power kWD total

13

... 8000kW

± 3% (power factor > 0.6)

 

 

 

 

kVA demand kVA total

13

... 8000kVA

± 2%

 

 

 

 

kVAR demand kVAR per phase

13

... 8000kVA

± 2%

 

 

 

kVAR demand total

-24000 ... 24000kvar

± 4% (power factor > 0.6)

 

 

 

 

kWhr imported

1

... 10000MWh

± 2%

 

 

 

 

kWhr exported

1

... 10000MWh

± 2%

 

 

 

 

kVARh imported

1

... 10000Mvarh

± 4%

 

 

 

 

kVARh exported

1

... 10000Mvarh

± 4%

 

 

 

 

Frequency

15

... 440 Hz

± 0.1 Hz

 

 

 

 

Total harmonic distortions for current and voltage

2

... 100%

± 3% from the meas. range up to the 29th harmonic

 

 

 

 

Phase unbalance for current and voltage

2

... 150%

± 1%

 

 

 

 

 

Table 2-7The metering function provides a minimum and maximum measured value for each measured value specified above. If the metering function is retrofitted by the customer, the accuracy of the values specified cannot be ensured, since it will not have been calibrated with the trip unit.

1.Accuracy is specified as follows: ± (x%) from the upper limit of effective range + 2 LSD (Least Significant Digit)) as shipped from the factory

Measurement conditions:

 

 

 

 

Frequency

f = 60 Hz

 

Power supply

UL Listed 24V DC class 2

Power factor

cos

= 1

 

Warm-up period

2 hours

Waveform

Total harmonic distortion≤ 5%; symmetrical load

Relative air humidity

Up to 90%

Ambient temperature

35°C ± 5°C

 

 

 

 

 

 

 

 

Metering range:

 

 

 

 

 

Current

0.2

... 1.2

Inmax

 

 

Voltage

0.8

... 1.2

Vnmax

 

 

2/16

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 specifications Metering range

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.