DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control


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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 1

DESCRIPTIVE BULLETIN RET615 ANSI Transformer protection and control The RET615 is a dedicated transformer protection and control IED for power transformers, unit and step-up transformers including power generatortransformer blocks in utility and industry power distribution systems. RET615 is a member of ABB’s Relion® product family and a part of its 615 protection and control product series. The 615 series relays are characterized by their compactness and withdrawable design. Engineered from the ground up, the 615 series has been designed to unleash the full potential of the IEC 61850 standard for communication and interoperability between substation automation devices. energization and a fifth harmonic restraint function ensures good protection stability at moderate overexcitation of power transformers. Application The RET615 is the ultimate protection and control relay for two-winding power transformers and power generator-transformer blocks. It can be applied for protection and control of the most commonly used power transformer combinations of delta and wye (grounded or ungrounded) windings. Flexible order coding allows for choosing current-only or current-and-voltage configurations to best fit your transformer application needs. The low-impedance REF protection uses neither stabilizing resistors nor varistors and allows the ratio of the grounded neutral CT to differ from the phase current transformer ratios. Because the REF protection characteristics do not need time grading with other protection schemes, high-speed fault clearance may be achieved. The RET615 also includes a thermal overload protection function, which supervises the thermal stress of the transformer windings to prevent accelerated aging of the insulations. Multiple stages of phase and ground overcurrents are provided for both transformer windings plus optional voltage inputs for metering and protection of one transformer winding or both windings. A fast three-channel arc-fault protection system for arc flash supervision of the switchgear compartments is offered. Protection and control The RET615 features three-phase, multi-slope transformer differential protection with an unrestrained stage and a restrained stage to provide fast and selective protection for phase-to-phase, winding interturn and bushing flash-over faults. Besides second harmonic restraint an advanced waveform-based blocking algorithm ensures stability at transformer Sensitive restricted earth-fault protection (REF) completes the overall differential protection to detect even single phase-to-ground faults close to the grounded neutral of the transformer. RET615 also integrates basic control functionality, which facilitates the control of two circuit brea

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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 2

via the front panel HMI or by means of remote controls. To protect from unauthorized access and to maintain the integrity of information, the relay has been provided with a four-level, role-based, user authentication system. The access control system applies to the front panel HMI, the web browser based HMI and the PCM600 Protection and Control IED Manager. language enables the use of engineering tools for efficient configuration and commissioning of substation devices. For accurate time stamping RET615 supports synchronization over Ethernet using SNTP or over a separate bus using IRIG-B....

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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 3

RELION 615 SERIES TRANSFORMER PROTECTION AND CONTROL Included = •, Optional = • Protection Phase percentage differential (two windings), restrained and unrestrained Phase overcurrents (Winding 1) Phase overcurrents (Winding 2) Directional phase overcurrent Phase power directional Neutral overcurrents (Winding 1) Neutral overcurrents (Winding 2) Ground overcurrents Directional neutral overcurrent Neutral power directional Thermal overload Undercurrent Restricted earth fault (REF), low impedance (Winding 2) Negative sequence overcurrent (Winding 1) Negative sequence overcurrent (Winding 2)...

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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 4

RET615 Functional Application Firmware version 4.0, 4.2 Included = •, Optional = • ANSI Function Three-phase currents (Winding 1) Three-phase currents (Winding 2) Sequence currents (Winding 1) Sequence currents (Winding 2) Ground current Demand values (Windings 1 & 2) Maximum and minimum demand values (Windings 1 & 2) Three-phase voltages Sequence voltages Ground voltage Max number of Digital Inputs Max number of Digital Outputs Max number of High-Speed Outputs (HSO’s are optional and take the place of some digital outputs) Front 100Base-TX Ethernet (RJ45) port Rear 100Base-TX Ethernet...

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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 5

RELION 615 SERIES TRANSFORMER PROTECTION AND CONTROL Analog inputs • Three phase currents: 5/1 A programmable • Ground current: 5/1 A programmable or 0.2 A Rated frequency: 60/50 Hz programmable • Three-phase and ground voltages: programmable nominal secondary voltage (available as options) Binary inputs and outputs • Four, eight with VT inputs, binary inputs standard • Two NO outputs with trip circuit monitoring • Three NO outputs • One Form C output and self-check alarm output • Additional binary inputs and outputs available as options Communication • IEC 61850-8-1 with GOOSE messaging •...

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DE SCR I P TI V E B U LLE TI N RET615 ANSI Transformer protection and control - 8

ABB Inc. 4300 Coral Ridge Drive Coral Springs, Florida 33065 Phone: +1 954 752 6700 We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG does not accept any r esponsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or...

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