Siemens UL 489, UL1066 ZSI Module, Operating principle, Example as illustrated in Graphic

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Communication-capable Circuit Breakers

WL Circuit Breaker

ZSI Module

To use the ZSI function with the WL Circuit Breaker, the external CubicleBUS ZSI module must be implemented.

The zone selective interlocking (ZSI) module provides the complete range of selectivity with the short

delay time of tZSI = 50 ms, irrespective of the number of levels

and the location of the short-circuit in the distribution system. Its benefits become even more apparent, the higher the number of levels in large systems and the longer the resulting delay times.

By shortening the time, the ZSI module significantly reduces stress and damage in the event of a short- circuit in the switchgear.

Operating principle

If the ZSI module is used in a distribution system comprising several levels, each circuit breaker affected by a short-circuit interrogates the circuit breaker directly downstream, to ascertain whether the short-circuit also occurred in the next level below:

•If the short-circuit did occur in the downstream level, the upstream circuit breaker delays tripping to ensure that the circuit breaker directly upstream of the short- circuit has enough time to interrupt the short-circuit.

•If the circuit breakers in the downstream level do not report a short-circuit, the short-circuit occurred between the two levels in question. In this case, one of the two upstream circuit breakers interrupts the short-circuit once

the programmed delay time of tZSI = 50 ms has elapsed.

Example as illustrated in Graphic 2-6.

This shows a section of a power distribution system that has been installed with the ZSI module. WL Circuit Breakers are implemented at different levels.

Short-circuit at 3:

Circuit breakers -Q5, -Q3, and -Q1 establish that a short-circuit has occurred. -Q5 blocks -Q3 by means of the ZSI signal and, as a result, -Q1 too, so that they do not trip in 50 ms. Since -Q5 does not receive a blocking signal from a subordinate circuit breaker, it is responsible for interrupting the short-circuit as quickly as possible. If this does not take place, because the circuit breaker is no longer operational due to an overcurrent, -Q3, as a backup, trips after the time-discriminating response time of 150 ms.

Short-circuit at 2:

-Q1 and -Q3 establish that a short- circuit has occurred; -Q5 does not. For this reason, -Q3 does not receive a blocking signal from -Q5, but provides a blocking signal for -Q1. This information tells -Q3 that it is closest to the short-circuit and trips with a delay of tS = 50 ms instead of tsd = 150 ms. Time saved = 100 ms.

Graphic 2-6This graphic illustrates the operating principle of the ZSI function using an example in a power distribution system. It is also a connection diagram that shows how the ZSI module must be wired if the WL Circuit Breakers are used.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Contents Global network of innovation Powerful ideasCommunication-capable Circuit Breakers Communication-capable Circuit Breaker Qualified Personnel Safety GuidelinesCorrect Usage Registered TrademarksIntroduction Overview Introduction Content of the ManualGeneral WL Circuit Breakers-Modular Intelligent System SolutionsCost Saving Easy PlanningModbus Communication Bus SystemsCommunication Structure of the WL Circuit Breakers Ethernet WL Circuit Breaker Brief Description of the WL Circuit Breaker Introduction and OverviewCommunications Capability of the Electronic Trip Units ETUs CubicleBUSETU725 ETU727 ETU745 Functional overview of the trip unit systemBasic Functions ETU725 ETU727 ETU745 Setting range of the IgBasic Functions ETU748 ETU755 ETU776 Communication Data point group ETU745 Data Availability on the CubicleBUSMetering Data points with the same source 755 orModbus Module COM16 Pin ConfigurationModbus COM16 Module and the BSS Modbus Installation Guideline Modbus Write Protection DPWriteEnableCubicleBUS + Data Exchange via the COM16 ModuleMeaning Position and text on the cable CubicleBUS Meaning Rear Microswitch S46 Middle S47 Front S48Cubicle BUS LED Meaning PositionBreaker Status Sensor BSS General Metering Function PlusWaveform buffer Metering Function PlusHarmonic analysis Voltage Transformers Parameters for the settings of the metering functionVT Accuracy Maximum distance from voltage transformerMetering range 81THDC Extended Protective Function Important functions/parameters for communicationsLoad Management Setpoints Normal Positive Power Flow DirectionMinimum for Communicated Currents Event and Trip LogExternal CubicleBUS Modules Rotary SwitchesInstallation CubicleBUS Installation Guidelines Power SupplyMaximum CubicleBUS Configuration Meaning LED DisplayCubicleBUS LED Meaning All other LEDs MeaningDevice Testing the Digital Input and Output ModulesDigital Input Module Technical data for the digital input moduleFunctional description Functional description for changing parameter setsSelector switch position to the left Digital Output Module with Rotary SwitchSelector switch position to the right Delay timeConfigurable Digital Output Module Trigger event Waveform buffer B Technical data for the digital configurable output moduleAnalog Output Module Power value ranges W/VATest function Switch position cosTechnical data for the analog output module Example as illustrated in Graphic ZSI ModuleOperating principle It trips after tZSI = 50 ms. Time saved = 250 ms Technical data for the ZSI moduleCommunication-capable Circuit Breakers General information Output current Inrush current Type Order No Communication-capable Circuit Breakers Modbus Profile for WL Circuit Breaker Supervisory Systems Function 02 Read Discrete Inputs COM16 Supported Function CodesFunction 01 Read Coils Reply Message from slave Function 03 Read Holding RegistersRequest Message to slave Function 07 Read Exception Status Function 04 Read Input RegistersFunction 05 Write Single Coil Function 12 Get Communication Event Log Function 08 DiagnosticsFunction 11 Get Communication Event Counter COM16 slave Send Event What the Event Bytes ContainFunction 15 Write Multiple Coils Function 16 Write Multiple Registers Exception Responses Code Name Meaning Exception CodesBasic Data Type 2 Registers and Default Data Points Default Register ListsBasic Data Type 1 Registers and Default Data Points Basic Data Type 3 Registers and Default Data Points Data bytes Complete List of DatasetsMin Max Bits Sample DatasetByte Register Description Bit Mapping for Breaker Status RegisterWL Configurator Brief Description Communication-capable Circuit Breakers Breaker Data Adapter BDA Breaker Data Adapter Plus BDA Plus Benefits of the BDA Brief Description and System RequirementsDescription BDA as a Hand-Held Device or BDA Plus BDA in Offline Mode or BDA PlusIntranet and Internet BDA Plus as an Ethernet InterfaceGetting started with the BDA Plus What is Java?Circuit breaker requirements Permanent Connection to WL Circuit BreakersTemporary Meaning of the LEDs on the BDA Operation4This table provides technical data for the BDA and BDA Plus Technical data for the BDA and BDA PlusUsually have to be changed. They are shown as a reference Connection to the BDA via the Serial Communication SystemBreaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Definition of Key Terms Connection to the BDA Plus via the Ethernet InterfaceSubnet Mask IP AddressesExample BDA IP AddressOffline/Online Mode Operating Instructions and TroubleshootingLanguages and Help Displaying DataSentron Password ProtectionOperation Example PrintingTroubleshooting List Fault Description Solution Siemens Energy & Automation, Inc. All Rights Reserved Siemens Energy & Automation, Inc

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.
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