PRODUCT GUIDE RET615 Transformer protection and control

Description Standard configurations Protection funtions Application Supported ABB solutions Control Measurements Disturbance recorder Event log Recorded data Condition monitoring Trip-circuit supervision Self-supervision Fuse failure supervision Access control

016 Inputs and outputs 017  – 021 Station communication 022– 042 Technical data 045 Local HMI 046 Mounting methods 046 Relay case and plug-in unit 046 Selection and ordering data 047 Accesories and ordering data 048 Tools 049 Cyber security 050-051 Terminal diagrams 052 Certificates 052 References 053– 054 Functions, codes, and symbols 054 Document rev

— RET615 Transformer protection and control 1. Description RET615 is a dedicated transformer protection and control relay 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 part of its 615 protection and control product series. The 615 series relays are characterized by their compactness and withdrawable-unit design. Re-engineered from the ground up, the 615 series has been designed to unleash the full potential of the IEC 61850 standard for...

Figure 1. Functionality overview for standard configuration B RET615 V5.0 FP1 ANSI Func Appl B Available with Arc Flash Detection (AFD) option Available with RTD option

Figure 2. Functionality overview for standard configuration F RET615 V5.0 FP1 ANSI Func Appl F 382 Available with Arc Flash Detection (AFD) option Available with RTD option — Table 1. Standard configurations Description Transformer differential with low imp. restricted EF on MV side Transformer differential with voltage protection & measurements and low imp. restricted EF on MV side, overexcitation, directional ground protection, and sync-check

Table 2. Supported functions

Table 2. Supported functions, continued () = optional 1) lo selectable by parameter, lo calculated as default 2) lo calculated is always used 3) IoB calculated and 3IB are always used 4) Uo selectable by parameter, Uo measured as default 5) Uo measured is always used 6) IoB measured and 3IB are always used 7) IoB selectable by parameter, IoB measured as default 8) Must be added with ACT to be available in SMT and in Relay. 9) Master Trip included and connected to corresponding HSO in the configuration only when BIO0007 module is used. If additionally the ARC option is selected, then ARCSARC is...

3. Protection functions The relay features three-phase, multi-slope stabilized (biased) stage transformer differential protection and an instantaneous stage to provide fast and selective protection for phase-to-phase short circuit, winding interturn fault and bushing flashover protection. Besides second harmonic restraint, an advanced waveform-based blocking algorithm ensures stability at transformer energization and a fifth harmonic restraint function ensures good protection stability at moderate overexcitation of power transformers. Sensitive restricted ground-fault protection completes the...

4. Application RET615 provides main protection for two-winding power transformers and power generatortransformer blocks. The standard configurations offer comprehensive protection functions for detection and elimination of operational disturbance conditions and power transformer faults. Furthermore, the RTD/mA inputs can be used for measuring the ambient air temperature. The RTD inputs also offer thermal protection of dry-type power transformers fitted with Pt-100 temperature sensors. Temperature measurement over the RTD/ mA inputs extends the function of the three-phase thermal overload protection...

Figure 3. Illustrates the protection of a two winding power transformer with configuration B. The main protection used in this application example is transformer differential protection. Additionally, Figure 4. Protection of two-winding power transformers feeding a single busbar switchgear arranged into two bus sections separated with bus coupler. restricted ground fault protection with numerical low impedance principal is applied on the transformer’s LV side. Figure 4 Illustrates the protection of the two winding power transformers feeding a double ended substation. In this case configuration...

5. Supported solutions The 615 series protection relays together with the Substation Management Unit COM600F constitute a genuine IEC 61850 solution for reliable power distribution in utility and industrial power systems. To facilitate the system engineering, ABB's relays are supplied with connectivity packages. The connectivity packages include a compilation of software and relay-specific information, including single-line diagram templates and a full relay data model. The data model includes event and parameter lists. With the connectivity packages, the relays can be readily configured using...

Figure 5. ABB power system example using Relion relays, COM600F and MicroSCADA Pro/ System 800xA Ethernet switch Analog and binary horizontal GOOSE communication 6. Control RET615 integrates functionality for the control of a circuit breaker via the front panel HMI or by means of remote controls. In addition to the circuitbreaker control the relay features two control blocks which are intended for motor-operated control of disconnectors or circuit breaker truck and for their position indications. Further, the relay offers one control block which is intended for motor-operated control of one grounding...

7. Measurements The relay continuously measures the high voltage (HV) side and the low voltage (LV) side phase currents and the neutral current of the protected transformer. In addition, the relay calculates the symmetrical components of the currents and voltages, maximum current demand value over a user-selectable pre-set time frame, the active and reactive power, the power factor, and the active and reactive energy values. Calculated values are also obtained from the protection and condition monitoring functions of the relay. Depending on the standard configuration, the relay also measures...