IRI1 – Time overcurrent relay

IRI1 – Time overcurrent relay

The digital time overcurrent relay IRI1 is a universal protection device for low, medium and high voltage networks.

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IRI1-ES – Sensitive Earth Fault Current Relay

IRI1-ES – Sensitive Earth Fault Current Relay

When compared with traditional protection systems the protective relaying with MR- and IR-relays of our HIGH TECH LINE offers several advantages. All MR protection relays are based on microprocessor technology. They present the generation of our most efficient protection relays, because of their capabilities to process the measuring values digitally and to perform arithmetical and logical operation. Additional advantages such as very low power consumption, adaptability, possibilities for self-supervision, flexible construction, selection of relay characteristics are completely utilized. Some IR protection relays are based on microprocessor and some like the IRI1-ES on analog technology. They present our low-priced protection relay generation and are used for all basic protection application. The following properties of the IR protection relays, such as: • Integration of multiple protection functions into one compact housing, • User-friendly setting procedure by means of DIP-switches, • Compact design due to SMD-technique, are their superiority over the traditional protection systems. For all applications of a more complex nature, e.g. directional earth fault detection and where operating convenience, fault analysis and communication ability are required, MR-relays are used. All relays of the HIGH TECH LINE are available for through panel mounting and in 19“ racks. Connection terminals are of plug-in type. All IEC/DIN regulations required for the individual application are reliably met by these relays.

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IRI1-ER - Stabilized Earth Fault Current Relay

IRI1-ER - Stabilized Earth Fault Current Relay

The application of powerful microprocessors with MR- and IR-relays of the HIGH TECH LINE provides a large variety of advantages over power protection systems of the traditional type. The MR-protection relays are based exclusively on the microprocessor technology. They represent our most efficient generation of power protection systems. Because of their capabilities to process measured values digitally and to perform arithmetical and logical operations, they are superior to the traditional analog systems. Besides, the digital protection relays offer important additional advantages such as very low power consumption, adaptability, possibilities for self-supervision, flexible construction, selection of relay characteristics etc. The IR-protection relays may be based on the microprocessor technology or on the analog technology. They represent a more cost saving generation of relays of the HIGH TECH LINE, used for basic equipment protection. The IR-protection relays are superior to conventional protective devices because of their following characteristics: • Integration of multiple protective functions into one compact housing • User-friendly setting procedure by means of DIP-switches • Compact construction type by SMD-technology MR-protection relays are used for more complex protective functions, such as for example for earth fault directional detection, and also in cases where easy operation, quick fault-analysis and optimal communication capabilities are required. All relays of the HIGH TECH LINE are available for front plate installation, as well as for 19“ rack mounting. Plug-in technology is used. Of course, all relays comply with the IEC/DIN regulations required for the specific protection application.

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IRU1 – AC voltage relay

IRU1 – AC voltage relay

When compared with traditional protection systems the protective relaying with MR- and IR-relays of our HIGH TECH LINE offers several advantages. All MR protection relays are based on microprocessor technology. They present the generation of our most efficient protection relays, because of their capabilities to process the measuring values digitally and to perform arithmetical and logical operation. Additional advantages such as very low power consumption, adaptability, possibilities for selfsupervision, flexible construction, selection of relay characteristics are completely utilized. Some IR protection relays are based on microprocessor and some on analog technology. They present our low-priced protection relay generation and are used for all basic protection application. The following properties of the IR protection relays, such as: • Integration of multiple protection functions into one compact housing, • User-friendly setting procedure by means of DIP-switches, • Compact design due to SMD-technique, are their superiority over the traditional protection systems. For all applications of a more complex nature, e.g. directional earth fault detection and where operating convenience, fault analysis and communication ability are required, MR-relays are used. All relays of the HIGH TECH LINE are available for through panel mounting and in 19“ racks. Connection terminals are of plug-in type. All IEC/DIN regulations required for the individual application are reliably met by these relays.

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IRU1-DC - DC Voltage Relay

IRU1-DC - DC Voltage Relay

When compared with traditional protection systems the protective relaying with MR- and IR-relays of our HIGH TECH LINE offers several advantages. All MR protection relays are based on microprocessor technology. They present the generation of our most efficient protection relays, because of their capabilities to process the measuring values digitally and to perform arithmetical and logical operation. Additional advantages such as very low power consumption, adaptability, possibilities for selfsupervision, flexible construction, selection of relay characteristics are completely utilized. Some IR protection relays are based on microprocessor and some on analog technology. They present our low-priced protection relay generation and are used for all basic protection application. The following properties of the IR protection relays, such as:  Integration of multiple protection functions into one compact housing,  User-friendly setting procedure by means of DIP-switches,  Compact design due to SMD-technique, are their superiority over the traditional protection systems. For all applications of a more complex nature, e.g. directional earth fault detection and where operating convenience, fault analysis and communication ability are required, MR-relays are used. All relays of the HIGH TECH LINE are available for through panel mounting and in 19“ racks. Connection terminals are of plug-in type. All IEC/DIN regulations required for the individual application are reliably met by these relays.

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MRA1 – Trip Circuit Supervision

MRA1 – Trip Circuit Supervision

The MRA1 - relay of the HIGH TECH LINE is used to supervise the tripping circuit of protective devices taking into consideration the following protective criteria:  supervision of the auxiliary voltage for the tripping circuit and for the supply of protective devices  supervision of the tripping circuit with regard to cable break  supervision of the mechanical functions of the circuit breaker

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MRF3 – Frequency Relay

MRF3 – Frequency Relay

The MRF3 is a universal frequency relay and contains the protective functions required by most electrical utilities for mains parallel operation of power stations: • Four elements for over- or under frequency protection • Two elements for frequency gradient supervision df/dt • Fast decoupling of the generator from the grid at mains failure • Suitable for load shedding systems

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MRG3 – Generator protection with mains supervision,

MRG3 – Generator protection with mains supervision,

The MRG3 is a universal mains decoupling device that covers all the protection functions which are required by VDEW and by most other utilities for the mains parallel operation of power stations such as:  over/and under voltage protection,  over/and under frequency protection,  extremely fast generator mains decoupling in case of vector surges or rate of change of frequency df/dt The MRG3 can furthermore be equipped with a multi-purpose over current time and earth fault protection re-lay and it has been designed as to be also used for grids with isolated and compensated star points respectively. It is applicable for the mains parallel operation of power generating gen.- sets and includes the following protection functions.  Independent (Definite) time over current relay,  dependent time over current relay with selectable characteristics, independent short circuit protection  two-element (low and high set) earth fault protection with definite or inverse time characteristics,  integrated determination of earth fault direction for application to power system networks with isolated star point or earth fault compensation (ER/XR-relay type),  two-step protection for the residual voltage

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MRI1 - Digital multifunctional relay for time overcurrent  protection

MRI1 - Digital multifunctional relay for time overcurrent protection

The MRl1 digital multifunctional relay is a universal time overcurrent and earth fault protection device intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for networks with a solidly earthed/resistance-earthed neutral point. • The protective functions of MRI1 which are implemented in only one device are summarized as follows: • Independent (Definite) time overcurrent relay. • Inverse time overcurrent relay with selectable characteristics. • Integrated determination of fault direction for application to doubly infeeded lines or meshed systems. • Two-element (low and high set) earth fault protection with definite or inverse time characteristics. • Integrated determination of earth fault direction for application to power system networks with isolated or arc suppressing coil (Peterson coil) neutral earthing. (ER/XR-relay type). • Integrated determination of earth short-circuit fault direction in systems with solidly-earthed neutral point or in resistance-earthed systems (SR-relay type). Furthermore, the relay MRI1 can be employed as a back-up protection for distance and differential protective relays. A similar, but simplified version of overcurrent relay IRI1 with limited functions without display and serial interface is also available.

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MRI1-IU - Voltage controlled time overcurrent relay

MRI1-IU - Voltage controlled time overcurrent relay

The digital multifunctional relay MRI1-IU is an universal protection device for alternators and other equipment. It provides the following functions: • Independent (definite) time overcurrent protection (DMT) • Inverse time overcurrent protection (IDMT) with the following selectable characteristics: Normal Inverse Very Inverse Extremely Inverse Automatic change over characteristic by undervoltage

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MRI3 – Digital multifunctional relay for overcurrent protection

MRI3 – Digital multifunctional relay for overcurrent protection

The MRl3 digital multifunctional relay is a universal time overcurrent and earth fault protection device intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for networks with a solidly earthed/resistance-earthed neutral point. The protective functions of MRI3 which are implemented in only one device are summarized as follows:  Independent (Definite) time overcurrent relay,  inverse time overcurrent relay with selectable characteristics,  integrated determination of fault direction for application to doubly infeeded lines or meshed systems,  two-element (low and high set) earth fault protection with definite or inverse time characteristics,  integrated determination of earth fault direction for application to power system networks with isolated or arc suppressing coil (Peterson coil) neutral earthing. (ER/XR-relay type),  integrated determination of earth short-circuit fault direction in systems with solidly-earthed neutral point or in resistance-earthed systems (SR-relay type). Furthermore, the relay MRI3 can be employed as a back-up protection for distance and differential protective relays. A similar, but simplified version of overcurrent relay IRI1 with reduced functions without display and serial interface is also available.

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MRI3-IHE - The digital multifunctional relay

MRI3-IHE - The digital multifunctional relay

The digitial multifunctional relay MRI3-IHE has been designed as a universal time overcurrent protection relay with evaluation of the 2nd harmonic for transformers. The relay gives a complete thermal characteristic of the electrical equipment to be protected taking into account its initial load. The MRI3-IHE furthermore provides a universal time overcurrent and earth fault protection with the following functions: It is equipped with the following functions: • Two-step overload protection with evaluation of the 2nd harmonic • Display of the measured values for 1st and 2nd harmonic • independent (Definite) time overcurrent relay. • inverse time overcurrent relay with selectable characteristics, • two-element (low and high set) earth fault protection with definite or inverse time characteristics.

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MRI3-ITE(R) - The digital multifunctional relay

MRI3-ITE(R) - The digital multifunctional relay

The digital multifunctional relay MRI3-ITE(R) has been designed as a universal time over current protection relay with thermal replica for generators, transformers and cables. The relay gives a complete thermal characteristic of the electrical equipment to be protected taking into account its initial load. The MRI3-ITE(R) furthermore provides a universal time over current and earth fault protection with the following functions:  Integrated determination of earth fault direction for application to power system networks with isolated or arc suppressing coil (Peterson coil) neutral earthing (ER-relay type),  independent (Definite) time over current relay.  inverse time over current relay with selectable characteristics,  two-element (low

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MRIK3 – Time overcurrent relay with auto reclosing relay

MRIK3 – Time overcurrent relay with auto reclosing relay

The MRlK1 digital multifunctional relay is a universal time over current and earth fault protection device with integrated auto reclosing relay intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for net-works with a solidly earthed/resistance-earthed neutral point. In transmission line networks more than 70% of the occurring faults are transient (electric arcs extinguish, branches are falling on the overhead lines etc.) With the application of the automatic reclosing (AR) together with protection relays, many electric arcs are extinguished through temporary interruption of the energy supply. Without utilizing the automatic reclosing (AR) power supply interruptions would occur quite frequently. Statistics have shown that yet part of the faults remain after the first fast AR can be cleared with a longer 2nd AR interval. The digital multi-shot, three phase auto reclosing relay MRIK3 fulfills these requirements for use on medium voltage transmission or distribution systems, by 4-element AR with variable adjustable dead times. Important: For additional common data of all MR-relays please refer to manual "MR - Digital Multifunctional relays".

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MRIK3-C Digital time overcurrent relay

MRIK3-C Digital time overcurrent relay

The digital net protection relay MRIK3-C an universal time - over -current and earth fault relay with integrated control- and supervision function as well as optional an integrated auto reclosing function The earth fault protection is applicable for insulated and compensated grids. The controlling of the circuit breaker take place by the means of the front plate via push button in the case of a local operation, the remote operation can be done via digital inputs or via the serial communication interface. The earth-fault supervision is either realised in Holmgreen connection or by means of a core-type current transformer. The MRIK3-C is available with rated currents of 1 A or 5 A.

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MRL1 – Lock-out Relay

MRL1 – Lock-out Relay

The MRL1 of the HIGH TECH LINE is generally used as a common lockout relay, e.g. when the number of the available tripping contacts of the protection relay is to low or when the maximum switching capacity of the relay contacts is exceeded while the tripping coil of the circuit breaker is actuated.

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MRM3-2 – Motor Protection Relay

MRM3-2 – Motor Protection Relay

The motor protection relay MRM3-2 offers reliable protection for LV and MV motors which are either operated via power contactors or power circuit breakers. The following functions are integrated into this relay: • Overload protection acc. to IEC 255-8 in consideration of the initial load factor (thermal image) • Definite undercurrent protection • Definite time over current protection (DMT) • Inverse time over current protection (IMT) with select-able trip characteristics • Short-circuit protection • Load unbalance supervision with definite or inverse trip characteristics • Earth-fault detection with suppression of harmonics The MRM3-2 recognizes the “Start-Up“ and “Motor Running“ phase. Motors with a limited number of starts can be controlled by the start limiting function of the relay. The earth-fault supervision is either realized in Holm-green connection or by means of a core-type current transformer. The motor can be stopped in delayed or undelayed mode via digital inputs. The MRM3-2 is available with rated currents of 1A or 5A. Important: For additional common data of all MR-relays please refer to manual "MR - Digital Multifunctional relays". On page 45 of this manual you can find the valid software versions.

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MRN3 – Mains decoupling relay

MRN3 – Mains decoupling relay

The MRN3 is a universal mains decoupling device and covers the protection requirements from VDEW and most other utilities for the mains parallel operation of power stations.  Over/ and under voltage protection,  over/ and under frequency protection,  extremely fast decoupling of generator in case of mains failure (MRN3-1) or  rate of change of frequency df/dt (MRN3-2) Because of combination of three protection functions in one device the MRN3 is a very compact mains decoupling device. Compared to the standard used single devices it has a very good price/performance ratio. For applications where the single protection functions are required Woodward can offer the single MR-relays as follows:  MRU3-1 four step independent over-/ and under voltage protection (also used for generator earth fault protection).  MRU3-2 two step independent over-/ and under-voltage protection with evaluation of the symmetrical voltage components.  MRF3 four step independent over/ and under- frequency protection and two step frequency gradient supervision df/dt.  MRG2 generator mains monitor / vector surge detection.

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MRN3-3 – Mains decoupling relay

MRN3-3 – Mains decoupling relay

The mains decoupling relay MRN3-3 has been designed for the use under special conditions, especially to be found at wind parks. If power generating systems are due to comply with the GridCodes, i.e. if they shall not immediately disconnect from the grid in case of a mains failure, but support it, instead, the MRN3-3 will be the optimal relay. Its' function is to supervise mains voltage and mains frequency in compliance with the GridCodes, the grid connection rules and the operator guidelines. For this reason, the distinction between short-distance or long-distance errors is an elementary fact. As per the requirements of the e-on grid connection rules (version dd. 20.08.03) and the VDN guideline “EEG power generating plants at high and maximum voltage systems”, in addition to the standard protection functions, the MRN3-3 provides the voltage time characteristics which are necessary to distinguish between short distance and long distance errors. Normal voltage collapse shapes at mains failures are taken into account by these characteristics, that allow selective disconnection of systems only there, where it is absolutely required for operation. If, in the event of a failure, the systems are to be connected to the grid for a longer period, they will support the mains voltage and thus avoid large-area breakdowns that could no more be compensated by the interconnected network's primary control reserve. Thanks to the presence of two independent characteristics, it is possible to distinguish between short-term or permanent interruption, each according to the type of error. In the event of a failure, the fault sequence can be recorded by an oscilloscope. Within this error scenario, the MRN3-3 with its characteristics hat have been applied for the first time in protection technique - is of enormous use for the accurate identification and analysis of the grid state - as demanded by the rules.

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MRP2 - Directional Power Relay

MRP2 - Directional Power Relay

The power relay MRP2 is used in 3-phase systems for active power measurement. In the single-phase relay type MRP2-1, the load of the three phases is assumed to be symmetrical so that a single phase power measurement can be realized. For application fields (i.e. turbine movers) where two reverse power switching points with higher precision are required, the relay type MRP2-R is avail-able. Among others, the MRP2-relays serve:  for supervision of load flow between two systems. (MRP2) If the generated power of one system fails, unimportant consumers have to be disconnected by the power relay. Thereby the mains is stabilized and the supply of important consumers maintained. If gen.-sets are operating in parallel, these consumers can be disconnected if the load remains below the set minimal value or - in peak load operating mode - they can be connected if a limit value for the mains power is exceeded.  as reverse power relay to protect turbines and Diesel gen.-sets from reverse power if this prime mover fails. (MRP2 and MRP2-R) For generators operating in parallel with a mains or another generator, it is imperative to supervise the power direction. If for example the prime mover fails the alternator operates as a motor and drives the prime mover (diesel or turbine). The MRP2 "recognizes" the reverse of the power direction and - in case of this error - switches off the alternator. This way, power losses and damages of the prime mover are avoided.  as voltage dependent reverse power relay for mains decoupling The criterium for tripping the voltage-dependent reverse power element is the reverse power with simultaneous voltage decrease as a result of an external mains fault. Decoupling prevents external mains faults from affecting the own mains section. Internal faults are selectively detected by other protection devices.

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MRP2-S3 – Apparent Power Relay

MRP2-S3 – Apparent Power Relay

The power relay MRP2-S3 is used in 3-phase systems for apparent power measurement. Among others, the MRP2-S3-relays serve: applied to • monitor the maximally generated apparent power in a wind park or power station If the generated power of one system fails, unimportant consumers have to be disconnected by the power relay. Thereby the mains is stabilized and the supply of important consumers maintained. If gen.-sets are operating in parallel, these consumers can be disconnected if the load remains below the set minimal value or - in peak load operating mode - they can be connected if a limit value for the mains power is exceeded

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MRQ1 – Field failure relay

MRQ1 – Field failure relay

The field failure relay MRQ1 protects synchronous generators against operation outside the stable operation area due to loss of excitation. When partial or complete loss of excitation occurs on a synchronous machine, reactive power flows from the system into the machine and the apparent impedance as viewed from the machine terminals goes into the negative X region in the R-X diagram. The MRQ1 detects the low or under impedance condition and trips the generator circuit breaker, thus preventing damage due to out of step operation and system instability. The under impedance measurement provides two elements with separate impedance and time settings. Therefore setting according to the dynamic and steady state stability curve is possible. MRQ1 calculates the momentary impedance value from the generator current and voltage and compares this value with the two settings of the under impedance elements. Under impedance circle no. 1 reproduces the steady state stability area of the generator. Element no. 1 may be used for alarm purposes and corrective measures like boost excitation. Element no. 2 reproduces the dynamic stability area of the generator. The time delay is set to a lower value. It provides fast clearing on complete loss of field and backs up element no. 1. Element no. 2 should trip the generator circuit breaker quickly. The following factors determine the setting of the two elements: Stability diagram of the generator, excitation system of the generator and the system configuration.

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MRR1 – Multifunctional Generator Rotor Protection Relay

MRR1 – Multifunctional Generator Rotor Protection Relay

The generator rotor protection relay MRR1 com-bines rotor earth fault protection, excitation overand undercurrent protection as well as rotating diode failure protection. Thus providing a powerful protection regarding the rotor of synchronous generators, covering the following ANSI codes: 37 DC undercurrent relay 40 Field relay 58 Rectification failure relay 64 Ground detector relay 76 DC over current relay The MRR1 is recommended for synchronous generators and motors above 1 MVA rating. The rotor earth fault element detects high- and low resistance earth faults of the rotor winding. It is equipped with two stages, one for alarm, one for trip. The excitation current protection element super-vises the DC excitation current of brushless excitor machines. The protective functions are: Undercurrent, over current and ripple detection for diode failure protection.

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MRS1 - Negative sequence relay

MRS1 - Negative sequence relay

The MRS1 relay is a negative sequence protection relay with universal application. It serves for negative sequence protection of three-phase generators. With a large number of different tripping characteristics and adjustment possibilities, the tripping characteristic can be made suitable for almost every type of generator with regard to its special thermal time-constant. There is a choice between an independent or an inverse time tripping characteristic. In case of low unbalanced load, a warning is given after an adjustable time delay. In case of inadmissible high unbalanced load, the MRS1 relay trips in accordance with the set characteristic.

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MRT1 – Test Unit

MRT1 – Test Unit

The MRT1 is a test unit for all relays of the HIGH TECH LINE. By means of this test unit the functions of the relay, as well as the set values and actually measured values can be checked. The MRT1 can be mounted side by side with a HIGH TECH LINE relay and can be used as a permanent measuring point after wiring accordingly, or as 19“ plug-in types, it is simply plugged in beside the installed relay. For this a plug-in section must be reserved beside the relay to be checked, with the respective HIGH TECH LINE terminal block being fixed there. If not used by a plugged-in MRT1, this section can be closed with a delivered cover plate.

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MRU3-1 – AC voltage relay

MRU3-1 – AC voltage relay

The voltage supervision relay MRU3-1 protects electrical power generators, consumers or operating components generally against over- or under-voltages. Among other applications the relay can be used for detection of over- or undervoltages in power genrating plants and energy supply systems  to protect generators against critical overvoltages in case of defective voltage regulators  as undervoltage protection for motors  as generator stator earth fault protection  as over- and undervoltage protection with evaluating the symmetrical components (MRU1-2, detailed information on this type can be found in the relevant technical description) There is also a similar protection relay IRU1 avail-able in a more simpler design, i.e. with less function, without display and without serial interface.

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MRU3-2 – Voltage relay with evaluation of Symmetrical components

MRU3-2 – Voltage relay with evaluation of Symmetrical components

The MRU3-2 is a relay for voltage supervision with universal application, it protects the three-phase network against voltage unbalance or earth faults in isolated networks. Beside the pure rms value measurement of the line voltage the MRU3-2 evaluates the symmetrical components (positive-, negative- and zero sequence system). By evaluating these components relay MRU3-2 can detect the phase sequence, voltage unbalance and earth-faults. Important: For additional common data of all MR-relays please refer to technical description "MR - Digital Multifunctional Relays".

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