Well suited for both new and existing applications

As a stand-alone unit, the Multilin A60 relay is DIN rail mountable and should be mounted inside the control cabinet of the medium voltage switchgear or motor control center. Sensors should be installed where there is a high probability of an arc flash occurring. 

As the Multilin A60 utilizes both light and pressure to detect an arc flash condition, installation and wiring of external CT's are not required. An external current supervision from a separate Instantaneous Over Current (IOC) device may be used and connected as a contact input for enhanced security and mitigation of nuisance tripping. 

Calibrating & testing

 The Multilin A60 provides an auto-calibration function for the sensors reducing total commissioning and testing time. Once installed and powered, the device will first run in calibration mode. This mode, sets the thresholds for both the light and pressurized sound based on surrounding or ambient conditions. As surrounding conditions may change, the Multilin A60 may be re-calibrated at anytime. 

Control panel interface

This figure shows the typical wiring diagram of the Multilin A60 Arc Flash System. The typical wiring diagram shows the connection of the input and output relays and the connected sources. The wiring diagram also shows the connection of the supervisory circuit (option) to the A60 unit. 

This application example below describes the ability of the Multilin A60 to be deployed in a cascading configuration across multiple MV switchgear sections and compartments, including through a substation bus bar vault. The Multilin A60 sensors should be installed at a certain distance from each other to ensure coverage of the entire bus bar. 

By connecting devices together using the transfer trip input/output, individual Multilin A60 devices may receive a transfer trip signal from an upstream or downstream device, ensuring fast, reliable detection of an arc flash event in large MV switchgear applications. 

Protection & Control

The 850R provides secure and reliable protection & autoreclose functionality by offering a comprehensive range of standard and advanced protection and control elements. The controller provides directional and non-directional overcurrent protection along with the option of single-phase tripping and reclosing. Additionally, voltage and frequency protection elements may be used to disconnect Distributed Energy Resources (DER).

Multilin 850R feeder protection relay functional block diagram

The 850 provides advanced communications technologies for remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Direct support for fiber optic Ethernet provide s high-bandwidth communications, allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The 850 also supports two independent IP addresses, providing high flexibility for the most challenging of communication networks.

Coil Circuit Supervision

The driving electronics board checks the coil connection continuity of the trip/close circuit, as well as the leakage current to ground. When magnitude of any phase current falls below the undercurrent trip pickup level for the time specified by the undercurrent trip delay. The alarm and trip pickup levels should be set lower than the lowest feeder loading during normal operations.

Capacitor Voltage Alarm

The Capacitor Voltage Alarm function defines the low voltage alarm for the internal/external capacitor charging power supply circuit. This rated voltage is used for charging the external capacitors that open and close the single-pole of the recloser. If the measured voltage of the capacitors is less than the configured percentage of the rated voltage, then the Cap Volt OP operand is generated. In addition, to prevent the charger from damage due to overloading or load short faults created by incorrect wiring, bad capacitors, or hardware failures, the 850R automatically turns off the capacitor charger to prevent damage.

Recloser Wear and Recloser/OHSW Health Monitoring

The 850R relay provides recloser/OHSW health information by monitoring and analyzing the operation count, arcing energy of breaking current, arcing time, opening time, and closing time when applicable. The recloser health status depends on many factors, such as permissible operation number, magnitude of breaking current, mechanical wear and contact wear.

Time of Day Timer

The Time of Day Timer function provides the user with the ability to program control actions based on real time. There are two identical Time of Day Timers.

Application

Monitoring of the total accumulated energy/accumulated demand/minimum and maximum power demand at the end of an event or a shift interval. A shift can be defined by the breaker status operand (opclosed) or operand derived from the Time of Day Timer element.

Voltage Disturbance

The Voltage disturbance function of Voltage Swell and Voltage Sag, as described in IEEE 1159-2009. When the voltage on any phase drops below this level a voltage sag condition occurs. Voltage sags are usually associated with system faults but can also be caused by switching heavy loads or starting large motors. Short duration voltage sag may cause process disruptions. Voltage swells are usually associated with system fault conditions, but they are much less common than voltage sags. An SLG fault on the system can cause a swell to occur, resulting in a temporary voltage rise on the healthy phases. Swells can also be caused by switching off a large load, load shedding, or switching on a large capacitor bank. Voltage swell may cause failure of the components depending upon the magnitude and frequency of occurrence.

Software and Configuration

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the Multilin 8 Series. EnerVista provides all the tools to monitor the status of the protected asset, maintain the device and integrate the information measured by the Multilin 8 Series, into SCADA or DCS process control systems. The ability to easily view sequence of events is an integral part of the setup software, as postmortem event analysis is critical to proper system management.

EnerVista Launchpad

EnerVista Launchpad is a powerful software package that provides users with all the setup and support tools needed for configuring and maintaining Multilin products. The setup tools within Launchpad allow for the configuration of devices in real-time, by communicating via serial, Ethernet or modem connections, or offline by creating device setting files to be sent to devices at a later time. Included in Launchpad is a document archiving and management system that ensures critical documentation is up-to-date and available when needed.

8 Series Setup Software

8 Series Setup Software is a single setup and configuration across the platform and can reduce device setup and configuration time.

The Multilin 8 Series platform delivers the highest level of quality, reliability and performance with…

The Multilin 8 Series platform features a number of robust capabilities for motor, transformer, generator and feeder monitoring and diagnostics.

The 8 Series provides advanced communications technologies for remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Direct support for copper/fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The 8 Series also supports two independent IP addresses providing high flexibility for the most challenging of communication networks.

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the Multilin 8 Series relays. EnerVista provides all the tools to monitor the status of the protected asset, maintain the device and integrate the information measured by the Multilin 8 Series, into SCADA or DCS process control systems. The ability to easily view sequence of events is an integral part of the setup software, as postmortem event analysis is critical to proper system management.

The setup tools within EnerVista Launchpad allow for the configuration of devices in real-time, by communicating via serial, Ethernet or modem connections, or offline by creating device setting files to be sent to devices at a later time.

Learn more about EnerVista Software.

8 Series Setup Software

8 Series Setup Software is single setup and configuration tool across the platform and can reduce device setup and configuration time.

• Metering - current,voltage, sequence components, power, energy, voltage
• Breaker operation & trip failure
• Event recording - 128 time tagged events
• Total breaker arcing current
• Ambient temperature /analog transducer input
• Analog transducer input
• Oscillography & Data Logger - 10 records up to 32 power cycles
• Simulation mode and playback capability.

The 750/760 features advanced monitoring and metering functions which include:

Fault Locator

The relay uses captured data to calculate the type, distance to and the impedance of the fault. Records of the last 10 faults are stored.

Breaker Conditions

The relay calculates the per-phase wear on the breaker contacts to establish a threshold. When the breaker maintenance threshold is exceeded the relay can trigger an alarm. An alarm is also generated if the relay detects that the supervisory trickle current is not present. A failure to respond to an open or close signal in a programmed time can be used to generate an alarm.

VT Failure

The VT failure feature monitors each phase of input voltage, generating an alarm and sending the programmed output signals when a failure is detected.

Analog Inputs

Any external quantity may be monitored via an auxiliary current input. Two analog input level monitoring elements and two rate-of-change elements are available. When the measured quantity exceeds the pickup level, the relay can trigger an alarm or signal an output.

Event Recording

The relay captures and stores the last 512 events, recording the time, date, cause, and system parameters. Events may be recorded selectively by category, so that only events of interest are recorded.

Oscillography

A block of configurable volatile memory can be used for recording samples of the AC input voltages and current, and the status of logic inputs and output relays. This memory can be configured between the ranges of two to 16 blocks with 16 to 256 power frequency cycles of data respectively. The amount of pre-event data recorded is set by the user. Trace memory recording can be triggered by operation of selected features or logic inputs. 

Trip Counter

The number of breaker trip operations is recorded, and can be displayed for statistical purposes (useful for units without operation counters).

• Networking interfaces - 10Mbps Ethernet, RS232, RS485 and RS422 ports
• Ethernet port, 10Mbps
• Multiple protocols - ModBus™ RTU, ModBus™ RTU, TCP/IP, DNP 3.0 Level 2

The 750/760 is equipped with three standard serial communications ports, one RS232 located in the front panel, and two RS485/RS422 in the rear of the relay. A rear Ethernet port is also available as an optional feature. The front panel port allows easy local computer access. The rear ports provide remote communications or connection to a DCS, SCADA, or PLC. The baud rate of all the serial ports is variable from 300 to 19,200 bps. The optional Ethernet port can be used to connect the 750/760 to 10 Mbps Ethernet networks. The 750/760 supports ModBus® RTU, DNP3.0 Level 2, and ModBus® RTU TCP/IP protocols.

The three serial ports support ModBus® RTU protocol, while any one of the two rear ports but not both can be configured to support DNP 3.0 Level 2. The optional Ethernet port supports ModBus® RTU via TCP/IP protocol. The communication system of the 750/760 is designed to allow simultaneous communication via all ports.

Using Ethernet as the physical media to integrate the 750/760 to Local or Wide Area Networks, replaces a multipoint wired network (e.g., serial Modbus®), and eliminates expensive leased or dial-up connections, reducing monthly operating costs.

Various user interfaces facilitate operation of the 750.

Display

A 40 character display allows access to setpoints, actual values, and diagnostic messages generated by a trip or alarm condition. The 750 can display 30 user-selected messages during keypad inactivity.

Indicators

Twenty LEDs indicate relay status, system status, and trip and alarm conditions.

IRIG-B Input

This feature provides time synchronization via standard GPS clock inputs.

The EnerVista™ Suite is an industry-leading set of software programs that simplifies every aspect of using the 750/760 relay. The EnerVista™ suite provides all the tools to monitor the status of your protected asset, maintain the relay, and integrate information measured by the 750 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the 750 Setup software included with every 750 relay, to carry out postmortem event analysis to ensure proper protection system operation.
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• Metering - current, voltage, sequence components per winding, power, energy, voltage
• THD and harmonics up to the 21st
• Expanded (doubled) sequence of event recorder and waveform capture (256 time stamped events and
  up to 128 cycles of oscillography data at a sampling rate of 64 samples per power cycle)
• Tap position up to 50 tap positions
• Ambient temperature /analog transducer input
• Analog transducer input
• Oscillography & Data Logger - 10 records up to 32 power cycles
• Simulation mode and playback capability.

The 745 features advanced metering functions including: 

Currents All current inputs feature harmonic level detectors. A sampling rate of 64 times the power cycle allows recovery up to the 21st harmonic. Total Harmonic Distortion (IEEE.519-1986) or Harmonic Derating Factor (as per ANSI/IEEE C57.110-1986) are calculated for each winding and compared against user-adjustable setpoints. 

Asset Monitoring
745 can monitor, calculate and log hottest-spot temperature, aging factor and lost of life data over a long period. These data combined with economic analysis, allows criteria to be developed regarding the best time at which to replace a power transformer due to load growth, i.e. to minimize the cost without significantly increasing the risk. 

Event Recording
The last 128 events are captured and stored, recording the time, date, cause, and system parameters of each event. This information is easily accessible by computer via communication port or the front panel display. 

Tap Position, Ambient Temperature, Analog Transducer-Input
The 745 monitors and displays tap position and ambient temperature. An optional general purpose transducer input allows a user-defined quantity to be monitored and used as part of the protection as defined by FlexLogic™. 

Simulation Mode
Simulation Mode allows testing the functionality of the relay by simply feeding arbitrary waveform data into the relays simulation buffer for playback as sampled current input signals. 

Fault Recording
System input signals are sampled at a rate of 64 times the power cycle. Because all the signals are sampled at the same instant in time the magnitude and phase relationship of each can be compared. A combination of 16 pre and post-trigger cycles can be saved. 

The 745 incorporates advanced automation features including powerful FlexLogic™ programmable logic, communication, and SCADA capabilities that far surpass what is found in the average line relay. The 745 integrates seamlessly with other relays for complete system protection.

• Networking interfaces - 10Mbps Ethernet, RS232, RS485 and RS422 ports
• Ethernet port, 10Mbps
• Multiple protocols - ModBus™ RTU, ModBus™ RTU TCP/IP, DNP 3.0 Level 2
• Fast, flexible and reliable communications - Embedded 10BaseT Ethernet capability provides faster data
  transfer thus improves system performance

The 745 is equipped with three standard serial communications ports, one RS232 located in the front panel, and two RS485/RS422 in the rear of the relay. One optional Ethernet port is available at the rear of the relay. The front panel port allows easy local computer access. The rear ports provide remote communications or connection to a DCS, SCADA, or PLC. The baud rate of all the ports is variable from 300 to 19,200 bps. The optional Ethernet port can be used to connect the 745 to 10 Mbps Ethernet networks. The 745 supports ModBus® RTU, DNP3.0 Level 2, and ModBus® RTU TCP/IP protocols.

The three serial ports support ModBus® RTU protocol, while either of the two rear ports can be configured to support DNP 3.0 Level 2. The optional Ethernet port supports ModBus® RTU via TCP/IP protocol. The communication system of the 745 is designed to allow simultaneous communication via all ports.

Using Ethernet as the physical media to integrate the 745 to Local or Wide Area Networks, replaces a multipoint wired network (e.g., serial Modbus®), and eliminates expensive leased or dial-up connections, reducing monthly operating costs.

Various user interfaces facilitate operation of the 745. 

Display
A 40 character display allows access to setpoints, actual values, and diagnostic messages generated by a trip or alarm condition. The
745 can display 30 user-selected messages during keypad inactivity. 

Indicators
Twenty LEDs indicate relay status, system status, and trip and alarm conditions. 

IRIG-B Input
This feature provides time synchronization via standard GPS clock inputs. 

The EnerVista™ Suite is an industry-leading set of software programs that simplifies every aspect of using the 745 relay. The EnerVista™ suite provides all the tools to monitor the status of the transformer, maintain the relay, and integrate information measured by the 745 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the745 Setup software included with every 745 relay, to carry out postmortem event analysis to ensure proper protection system operation. 
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