Protection & Control
Transmission Protection

Home > Automation & Protection > Protection & Control > Transmission Protection > L30

Protection & Control Online Store
Protection & Control Support
Protection & Control Press Room
Related Links
  Interactive Selector Guide - Line Differential
  Interactive Selector Guide - Line Distance
  Spotlight Application
  Typical Applications
  Transmission Principles & Protection

Multilin L30
Line Current Differential System

The L30 is a cost-effective line current differential protection relay intended for sub-transmission and medium voltage lines and cables providing reliable and secure operation even under the worst case power system conditions. The L30 provides secure high-speed fault detection and clearance suitable for three-pole tripping applications. The L30 supports inter-relay communications via direct fiber as well as standard RS422, G.703 and C37.94 telecommunication interfaces. The L30 also provides synchrophasor measurements over Ethernet per IEEE C37.118.

Key Benefits

  • Proven current differential protection ensures secure high-speed tripping
  • Advanced IEC61850 Ed. 2 certified implementation, complete settings via SCL files and IEC 61850-9-2 process bus solution enable resource and platform managing optimization and reduce cost of ownership
  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications
  • Increased sensitivity through dynamic charging current compensation and communication channel asymmetry compensation
  • Adaptive restraint characteristic provides excellent security against measurement errors including CT saturation
  • Advanced fault and disturbance recording, including internal relay operating signals, thus eliminating the need for external recording devices
  • Phasor Measurement Unit (synchrophasor) according to IEEE® C37.118 (2011) and IEC® 61850-90-5 support
  • Supports English, French, Russian, Chinese, Turkish and German languages on the front panel, software and manuals
  • Supports latest edition of waveform capture (COMTRADE 2013) simplifying fault records management

Applications

  • Overhead lines and underground cables of different voltage levels
  • Circuits with tapped transformer feeders
  • Suitable for three-terminal line configurations, with channel redundancy and direct transfer tripping (DTT)
  • Wide area system monitoring and control and using integrated protection and synchrophasor measurement
  • Applications requiring three-pole autoreclosing and independent synchrocheck supervision
Protection & Control
Monitoring & Metering
Communications
Software & Security
What's New

Key Features

  • Line current differential with adaptive restraint
  • Stub bus protection
  • Breaker failure
  • Three-pole autoreclose
  • Underfrequency protection
  • Phase directional overcurrent, neutral directional with dual polarity criteria, broken conductor and thermal overload
  • Non-directional overcurrent: phase, neutral and negative sequence
  • Phase over/under voltage, negative sequence overvoltage
  • Two independent synchronism check elements

Protection & Control

The L30 is a cost-effective line current differential protection relay intended for sub-transmission and medium voltage lines and cables, providing reliable and secure operation even under the worst case power system conditions. The L30 provides secure high-speed fault detection and clearance suitable for three-pole tripping applications. Part of the Universal Relay family, the L30 comes with a variety of versatile features, truly integrating protection, monitoring, metering, communication and control in one easy-to-use device. The Universal Relay family offers a high degree of modularity in its design and functionality, providing superior performance in protection and control, while meeting the toughest requirements of the marketplace.

Functional Block Diagram

L30 Block Diagram

ANSI® Device Numbers & Functions

Device Number Function
25 Synchrocheck
27P Phase Undervoltage
27X Auxiliary Undervoltage
49 Thermal Overload
50BF Breaker Failure
50DD Current Disturbance Detector
50G Ground Instantaneous Overcurrent
50P Phase Instantaneous Overcurrent
Device Number Function
50_2 Negative Sequence Instantaneous Overcurrent
51G Ground Time Overcurrent
51N Neutral Time Overcurrent
51P Phase Time Overcurrent
51_2 Negative Sequence Time Overcurrent
52 AC Circuit Breaker
59_2 Negative Sequence Overvoltage
59P Phase Overvoltage
59X Auxiliary Overvoltage
Device Number Function
67_2 Negative Sequence Directional Overcurrent
67N Neutral Directional Overcurrent
67P Phase Directional Overcurrent
79 Automatic Recloser
81U Underfrequency
87L Segregated Line Current Differential
87LG Ground Line Current Differential

Key Features

  • Real-time monitoring of remote, local and differential per phase currents
  • Oscillography - 64 samples/cycle, up to 64 records
  • Event Recorder - 1024 time tagged events, with 0.5ms scan of digital inputs
  • Data Logger - Up to 16 channels with user-selectable sampling rate
  • P & M class synchrophasors of voltage, current and sequence components – 1 to 120 frames/sec

Monitoring & Diagnostics

Monitoring & Diagnostics

The L30 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into DCS or SCADA monitoring and control systems like Viewpoint Monitoring as shown.

Advanced Automation

The L90 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 L90 integrates seamlessly with other UR relays for complete system protection.

Advanced Automation

FlexLogic allows for the customization of the L30 to operate and control the breakers and other auxiliary devices needed to fit most line protection schemes and applications.

Key Features

  • Complete IEC 61850 Process Bus solution providing resource optimization and minimizing total P & C life cycle costs
  • Three independent 100Mbps Ethernet ports enable purpose specific LAN support that eliminates latency effect of heavy traffic protocols on mission critical communication services
  • Embedded IEEE 1588 time synch protocol support eliminates dedicated IRIG-B wiring requirements for IEDs
  • Direct I/O secures high-speed exchange of binary data between URs
  • Increase network availability by reducing failover time to zero through IEC62439-3 “PRP” support

Advanced Communications

The L30 provides for secure remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. 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 available three independent and redundant Ethernet options provide the means to create fault tolerant communication architectures in an easy, cost-effective manner.

The L30 supports the most popular industry standard protocols enabling easy, direct integration into monitoring and SCADA systems.

  • IEC 61850 Ed. 2 with 61850-9-2 (Process Bus) and 61850-90-5 (synchrophasors) support
  • DNP 3.0 (serial & TCP/IP)
  • IEC 60870-5-103 and IEC 60870-5-104
  • Modbus RTU, Modbus TCP/IP
  • HTTP, TFTP, SFTP and MMS file transfer
  • SNTP and IEEE 1588 for time synchronization
  • PRP as per IEC 62439-3
  • IRC module that combines C37.92 multimode and direct connection singlemode
  • Supports Routable GOOSE (R-GOOSE)

UR Switch Module

UR Switch Module

In addition to providing high-speed connectivity directly to your Universal Relay, the UR Switch Module provides an additional 4 fiber Ethernet ports, for connection to other relays in the system as well as upstream connectivity. It also provides 2 RJ45 copper Ethernet ports which can be used to connect local devices such as PCs, meters, or virtually anything else in the system.

The UR Switch Module provides a simple way to add fully-managed Ethernet networking to your relays and devices without the need for additional hardware or a dedicated communications cabinet.

The UR Switch Module includes all of the management and features that come with all MultiLink managed switches, and can be easily integrated into a network that has other Ethernet switches.

When used in a ring topology with other UR Switch Modules or MultiLink Switches, the UR Switch Module can be configured to use MultiLink’s Smart RSTP feature to provide industry-leading network recovery for ring topologies, at a speed of less than 5ms per switch. Learn More

Interoperability with Enbedded IEC 61850

Use the L90 with integrated IEC 61850 to lower costs associated with generator protection, control and automation. GE’s leadership in IEC 61850 comes from thousands of installed devices and follows on years of development experience with UCA 2.0.

The L30’s IEC 61850 Process Bus module is designed to interface with the Multilin HardFiber System, allowing bi-directional IEC 61850 fiber optic communications. The HardFiber System is designed to integrate seamlessly with existing Universal Relay applications, including protection functions, FlexLogic, metering and communications. Learn more

Cyber Secutrity - CyberSentry™ UR (FW v7.4xx)

CyberSentry enables UR devices to deliver full cyber security features that help customers to comply with NERC CIP and NITIR 7628 cyber security requirements through supporting the following core features:

Password Complexity

Supporting up to 20 alpha- numeric or special characters, UR passwords exceed NERC CIP requirements for password complexity. Individual passwords per role are available.

AAA Server Support (Radius)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and roles within UR devices. The new and advanced access functions allow users to configure up to five roles for up to eight configurable users with independent passwords. The standard “Remote Authentication Dial In User Service” (Radius) is used for authentication.

Event Recorder (Syslog for SEM)

Capture all cyber security related events within a SOE element (login, logout, invalid password attempts, remote/local access, user in session, settings change, FW update, etc), and then serve and classify data by security level using standard Syslog data format. This enables UR devices integration with established SEM (Security Event Management) systems.

EnerVista™ Software

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the L30 relay. The EnerVista™ suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate information measured by the L30 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the UR setup software included with every UR relay, to carry out postmortem event analysis and ensure proper protection system operation. Learn More

Enervista Software

New and Enhanced Communication Capabilities

  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications (FW v7.40)
  • Increases GOOSE message reception up to 64 remote devices (FW v7.40)
  • IEC 61850 in line with Edition 2, IEC 61850 SCL file for all relay's setting (FW 7.30)
  • Three independent Ethernet ports
  • Time synchronization via IEEE 1588 (FW v7.00)
  • PRP as per IEC 62439-3 (FW 7.10)
  • IEC 60870-5-103 (FW v7.20)
  • New IRC module that combines C37.92 multimode and direct connection singlemode (FW v7.20)

Cyber Security - CyberSentry UR (FW v7.xx)

CyberSentry enables UR devices to deliver full cyber security features that help customers to comply with NERC CIP and NITIR 7628 cyber security requirements through supporting the following core features:

  • Password Complexity
  • AAA Server Support (Radius)
  • Role Based Access Control (RBAC)
  • Event Recorder (Syslog for SEM)

Fully Compatible with GE's Multlilin HardFiber System - Provides support for GE's IEC 61850 HardFiber Process Bus Solution:

Complete IEC 61850 Process Bus Solution providing resource optimization and minimizing total P&C life cycle costs. Learn more

Extended Oscillography Records (FW v7.xx)

  • Supports IEEE C37.111-1999/2013, IEC 60255-24 Ed 2.0 COMTRADE 2013 standard (FW v7.40)
  • Configurable events allow for records of up to 45s at 64 samples per cycle

New and Enhanced Protection and Control Functionality (FW version 5.90)

  • Line differential with new in-zone power transformer function 
  • Added backup protection functions with phase and neutral directional overcurrent 
  • New thermal overload element 
  • New broken conductor element 
  • Neutral directional overcurrent with dual polarity criteria "67N" (FW v 7.20)