MRI-V. Digital Multifunctional Relay for Voltage Controlled Overcurrent Protection. P&B Engineering Belle Vue Works Boundary Street Manchester M12 5NG

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1 MRI-V Digital Multifunctional Relay for Voltage Controlled Overcurrent Protection P&B Engineering Belle Vue Works Boundary Street Manchester M12 5NG Tel: Fax: /5/96 0 MRI-V 01/96H

2 Contents 1. INTRODUCTION APPLICATION FEATURES AND CHARACTERISTICS DESIGN CONNECTIONS Analogue input circuits Output relays Remote data communication Blocking Input FRONT PANEL Display LED indicators Push buttons CODE JUMPERS Password programming Alarm and Trip relay function WORKING PRINCIPLES ANALOGUE CIRCUITS DIGITAL CIRCUITS POWER SUPPLY VOLTAGE DEPENDENT TRIPPING CHARACTERISTIC REQUIREMENTS FOR THE MAIN CURRENT TRANSFORMERS RESET DELAY & DWELL TIME OPERATION AND SETTING LAYOUT OF THE CONTROL ELEMENTS RELAY SETTING PRINCIPLES Password protected parameter adjustment SETTING PROCEDURE Starting current for phase overcurrent relay (Isn and Isl) Time current Characteristic (CHAR I>) Tripping time delay or time multiplier for overcurrent (ti>) Current setting for high set overcurrent stage (I>>) Tripping time delay for high set overcurrent stage (ti>>) Setting of the Undervoltage Switching Point Reset & Dwell Nominal frequency INDICATION OF MEASURED VALUES AND FAULT DATA Indication of measured values Indication of fault data TEST TRIP RESET Hand reset Auto-reset at Power Up SETTING VALUE CALCULATION /5/96 i MRI-V 01/96H

3 7. RELAY CASE INDIVIDUAL CASE RACK MOUNTING TERMINAL CONNECTIONS TEST AND MAINTENANCE TECHNICAL DATA MEASURING INPUT CIRCUITS AUXILIARY POWER SUPPLY COMMON DATA SETTING RANGES AND STEPS Definite time phase overcurrent relay Inverse time phase overcurrent relay INVERSE TIME CHARACTERISTICS OUTPUT CONTACT RATINGS SYSTEM DATA HOUSING TERMINAL CONNECTION DETAILS ORDER FORM /5/96 ii MRI-V 01/96H

4 1. Introduction The application of powerful microprocessors opens a new chapter for power system protective relaying. The digital processing of measured values and the ability to perform complex arithmetic and logic operations, give digital protection relays significant performance and flexibility improvements over their traditional analogue counterparts. Additional advantages - very small power consumption, adaptability, self-supervision, fault diagnosis through fault data recording, smaller physical construction and selectable relay characteristics - all combine to allow the implementation of accurate and highly reliable protection schemes at a significantly reduced financial burden. The development of microprocessor based protective relays and their introduction into the market has been stimulated by the recent trend to replace analogue with digital equipment. This modern trend has prompted the development of a new P&B protective relay family - the MR relay series. This comprehensive family of protection relays can satisfy the demands of even the most complex protection schemes: MRI - Overcurrent Relay (Independent time/i.d.m.t + earth + directional facilities) MRI-V - Voltage Dependent Overcurrent Relay MREF - Restricted Earth Fault Relay MRAR - Auto-Reclosing Relay MRMF - Mains Failure Relay MRVT - Voltage Protection MRFT - Frequency Protection MROS - Vector Surge or Rate of Change of Frequency MRNS - Negative Sequence Relay MRRP - Power Relay MRCS - Check Synchronising Relay MRFF - Field Failure Relay MRDG - Differential Relay The superiority of digital protective relaying over traditional analogue devices, as embodied by the MR relay family, is summarized by the following features: Integration of many protective functions in a single compact case High accuracy owing to digital processing Digital relay setting with very wide setting ranges and fine setting steps Comfortable setting procedure through extensive human - relay dialogue Measured values and fault data indication by means of alpha-numeric display Data exchange with DCS/SCADA by means of RS485 Operational reliability through self-supervision A similar but simplified range, with reduced functions and without display, is also available. The MIRI - overcurrent and earth fault relays, and the MIRV - undervoltage, overvoltage and neutral voltage displacement relays. To complement the MR series, a range of Auxiliary, Timing and Tripping devices are also available. 2/5/96 1 MRI-V 01/96H

5 2. Application The MRI-V digital voltage dependent overcurrent relay is a universal multifunctional protection device for medium voltage networks. It offers both Definite Time and Inverse Definite Minimum Time (IDMT) overcurrent protection in a single compact unit. IDMT protection is also selectable between Normal Inverse, Very Inverse and Extremely Inverse characteristics in accordance with BS142 and IEC Furthermore, the MRI-V has an adjustable undervoltage switching point and may be employed as protection for voltage loss during short circuit of the generator where the decreasing current supplied may be lower than the full load conditions prior to the fault. The protective functions of the MRI-V are summarized as follows: Selectable protective functions between : - Definite time overcurrent relay - Inverse time overcurrent relay Inverse definite minimum time (IDMT) overcurrent relay with the following selectable characteristics in accordance with BS 142 and IEC 255-4: - Normal Inverse - Very Inverse - Extremely Inverse Two stage overcurrent relay High set overcurrent unit with instantaneous or definite time function Voltage controlled tripping characteristic 3. Features and characteristics Complete digital processing of the sampled measured values Digital filtering of measured values using discrete fourier analysis to suppress high frequency harmonics and d.c component induced by faults or system operations Extremely wide setting ranges with fine setting steps Unauthorized user access control through password protection User defined password Continuous self-supervision of software and hardware Outstanding design flexibility for easy selection of appropriate operational scheme for numerous applications Numerical display of setting values, actual measured values and memorized fault data etc. Serial data communication facilities via RS485 Wide voltage range for DC or AC power supply Withdrawable modules with automatic short circuit of C.T. inputs 2/5/96 2 MRI-V 01/96H

6 4. Design 4.1 Connections Application Diagram; L1 L2 L3 Supply 1 2 CASE External Reset Blocking Input L N L P2 S2 21 POWER SUPPLY P1 S I1 I2 I3 TRIP SIGNAL I> L 1-2 ALARM INDICATION I>> Alternative Earthing 19 MRI-V L SELF SUPERVISION RS485 + Gnd Typical Earthing Shown Analogue input circuits The constantly detected measuring values are galvanically decoupled, filtered and finally fed to the analogue/digital converter. The protection unit receives these analogue input signals for the phase currents I1, I2 & I3, and phase to phase voltages V12, V23 & V Output relays The MRI-V has four output relays, with single or dual pole change-over contacts as detailed in the previous diagrams and summarized below: Tripping relay (2) Self-supervision alarm relay (1) High set overcurrent relay (2) Low set overcurrent relay (2) 2/5/96 3 MRI-V 01/96H

7 4.1.3 Remote data communication As an option, the MRI-V may have an RS485 interface for remote data communication with a control centre. The unit provides the following information: Measured phase fault current values Status signals Self supervision alarm signal Actual measured current values Relay settings Phase fault signalling Blocking Input When required to inhibit the high set function I>>, the auxiliary supply is connected to the blocking input terminals, Front panel The front panel of the MRI-V comprises the following operation and indication elements: Alphanumeric display (4 Digits) 5 push buttons for setting and other operations 10 LEDs for measured value indication and setting Display The measured and set values, and recorded fault data, are shown alphanumerically on the display. The meaning of the displayed values is easily interpreted from the LED indicators on the front panel. 2/5/96 4 MRI-V 01/96H

8 Table: Adjustment possibilities by means of the display Function Display Shows Pressed push button and system reply Measured operating Actual measured current <SELECT> values (phase current) value, related to In Measured operating Actual measured voltage <SELECT> values (line voltages) value, related to Vn Recorded fault data Tripping current in L1, <SELECT> L2, L3 Setting value current settings I>, I>> related to In voltage switch value related to Vn <SELECT> <UP> <DOWN> trip time delay in second time multiplier Characteristics: - DEFT - NINV - VINV - EINV function Inhibited - EXIT Reset delay O s or 60s <SELECT> <UP> <DOWN Dwell time 200 or auto < SELECT> <UP> <DOWN. Nominal frequency f = 50, f = 60 <SELECT> <UP> <DOWN> Normal operation P&B <SELECT> long - system reset Inquire password PSW? <ENTER> / <TRIP> Save parameter? SAV? <ENTER> Save parameter SAV! <ENTER> Manual trip TRI? <TRIP> Relay is tripped TRIP <TRIP> / or system reply Secret password XXXX Push-button Maximum measuring range reached Illuminated LED L1, L2, L3 L1, L2, L3,V L1, L2, L3, I>, I>>,V I>, CHARI>, ti>, I>>, ti>>, V I> CHAR I ti.> L1, L2, L3, I> or I>> combination S,,,E max. System reply L1, L2, L3 2/5/96 5 MRI-V 01/96H

9 4.2.2 LED indicators The LEDs to the left of the display indicate measuring or tripping values. The purpose of the corresponding LED is identified by the adjacent inscription, (e.g. L2 for current in phase 2). The first row of three LEDs to the left of the display are bi-coloured - green indicates measuring and red indicates fault condition. The LED marked RS indicates active serial data communication. Five LEDs support the setting menu selection. They are arranged at the characteristic points on the setting curve and indicate the corresponding menu point selected Push buttons The front panel contains five push buttons used for setting, measuring and other user functions. The individual setting and measuring values can be selected in turn by pressing the <SELECT> / <RESET> push button. This button also resets the relay if pressed for approximately 3 seconds. The <UP> and <DOWN> push buttons are for incrementing and decrementing any selected parameter. Continuous pressing of these push buttons will cause the parameter to change at an increased rate. The <ENTER> push button is used to transfer the indicated value to the internal parameter memory. An unintended or unauthorized change of the selected parameter can be avoided through the password protection facility. The <TRIP> push button is used to test the output relay circuits, both for tripping and signalling. This operation is also password protected. 4.3 Code jumpers Behind the front panel of the MRI-V are three code jumpers used to preset the following functions: Password programming Alarm and Trip relay functions The following figure shows the position and designation of the code jumpers Front Board Code Jumper J3 J2 J1 Code Jumper ON Code Jumper OFF 2/5/96 6 MRI-V 01/96H

10 4.3.1 Password programming The MRI-V relay is normally delivered with the preset password " ". It can be reprogrammed using the removable code jumper J1. After power on and the pressing of any push button, the MRI-V relay enquires for a new password with the text <PSW?> appearing on the display. A new password is then entered by pressing a combination of <SELECT>, <UP>, <DOWN> or <ENTER>, as chosen by the user. After the new password has been given, the relay module is extracted from its case and code jumper J1 removed Alarm and Trip relay function The following functions of the MRI-V alarm relays may be preset using jumpers J1 & J2: Alarm relay activation upon initiation or after a trip Manual or Automatic reset of the output relays Code jumper J2 - OFF The alarm relays respond directly upon the initiation of the corresponding measuring circuit. Thus, an alarm signal, e.g. for overcurrent, will be given before the relay trips. Code jumper J2 - ON The alarm relay responds only after the relay has tripped. Thus, the alarm relay and the trip relay respond at the same time. Code jumper J3 - OFF All output relays will be reset automatically after tripping, once the fault has been cleared. Code jumper J3 - ON All output relays remain activated and must be reset manually by pressing the <RESET> push button, after the fault has been cleared. Summarizing the coding possibilities Code jumper Function Code jumper Position Operation Mode J1 Password OFF ON Normal position Password programming J2 Alarm Relays OFF ON Alarm relays will be activated on energizing. Alarm relays will be activated upon tripping. J3 Reset OFF ON Output relays will be reset automatically. Output relays will be reset manually. 2/5/96 7 MRI-V 01/96H

11 5. Working principles 5.1 Analogue circuits The incoming currents from the external current transformers are converted to internal signals in proportion to the currents, via the internal input transducers and shunt resistors. The noise signals caused by inductive and capacitive coupling are suppressed by an analogue RC filter circuit. The analogue signals are fed to the A/D converter of the micro-processor and transformed to digital signals through sample-hold circuits. The analogue signals are sampled with a sampling frequency of 800 Hz, namely a sampling rate of 1.25 ms for every measured quantity. The incoming voltages from the external voltage transformers are fed to operational amplifiers through the input transducers and RC filters. 5.2 Digital circuits The essential component of the MRI-V relay is a powerful micro-controller. All of the operations, from the analogue digital conversion to the relay trip decision, are carried out by the microcontroller digitally. The relay program, located in EPROM, allows the CPU of the microcontroller to calculate the three phase currents to detect a possible fault. For the calculation of the current value, an efficient digital filter, based on the Fourier Analysis (DFFT - Discrete Fast Fourier Transformation), is applied to suppress high frequency harmonics and DC components caused by fault induced transients or other system disturbances. The actual calculated current values are compared with the relay settings. When a current exceeds the starting value the unit starts the corresponding time delay calculation. When the set time delay has elapsed, a trip signal is given. The relay setting values for all parameters are stored in EEPROM, so that the actual relay settings cannot be lost, even in the event of auxiliary supply interruption. The micro-processor is supervised through a built in "Watch-dog" timer. Should a failure occur the watch-dog timer resets the micro-processor and gives an alarm signal via the self supervision output relay. 5.3 Power supply Two auxiliary power supply versions are available: Vaux = 24V in a range from 16V to 60V AC or in a range from 16V to 80V DC Vaux = 110V in a range from 50V to 270V AC or in a range from 70V to 360V DC 2/5/96 8 MRI-V 01/96H

12 5.4 Voltage Dependent Tripping Characteristic The MRI-V is the combination of an overcurrent time relay (MRI basic unit) and an additional undervoltage supervision unit. The undervoltage unit has an influence on the tripping time of the overcurrent and short circuit steps by switching in two tripping characteristics. In normal operation, at nominal voltage, the MRI-V operates like a normal overcurrent time relay with preselected tripping characteristics (IDMT, DMT) and an adjusted response value, Is. The following diagram shows the switching over to another value of Is. Isn is the response value during normal operation and IsL is the value during low voltage. Tripping characteristic as selected in & Movement of trip level upon switchover due to undervoltage I SL I SN I>>L I>>N In the case of failure, a short circuit of the alternator, the alternator voltage decreases. The MRIV will recognize this and then switch over without delay to a lower response value of Is. The value of IsL can be adjusted and as a result shorter tripping periods of the overcurrent and short circuit step can be achieved. The adjusted tripping characteristics; normal inverse, very inverse, extremely inverse or IDMT; is maintained. The undervoltage switching point can be adjusted from 10% to 100% of Vn. The reduced level of Is may be independently changed for both I> & I>>. Other adjustable ranges are given in the technical data section. 2/5/96 9 MRI-V 01/96H

13 5.5 Requirements for the main Current Transformers In order to ensure the correct operation of the MRI-V range of relays, protection class CT's must be utilized. Instrument CT's are NOT a suitable alternative. CT's should be chosen such that saturation, or loss of accuracy does not occur within the settings and operation ranges of the relays. In the absence of known settings the following may be regarded as an approximate guide. For 1A secondary CT class 5P20 or 10P20 2.5VA (Allowing for up to 1Ω of secondary lead resistance) For 5A secondary CT class 5P20 or 10P20 5VA (Allowing for up to 0.5Ω of secondary lead resistance) with due regard to a suitable CT ratio and fault level capacity Reset delay & dwell time In order to provide better discrimination with Electromechanical relays two additional settings are provided. The reset delay delays the reset of the relay following a Flashing Fault which simulates the time an electromechanical relay takes in order to wind back a partially rotated Disk (IDMT). This may be selected as 0 or 60 seconds. The dwell time, is an additional delay introduced on the output contacts used to prevent the contacts opening during a tripping action. This may be selected as 0 or 200 ms. 6. Operation and setting 6.1 Layout of the control elements All control elements required for the operation and adjustment of the MRI-V are located on the front panel. They are divided according to function into the three following groups: Alphanumeric Display: Indication of parameter set values, actual measured values and recorded fault data. LED's: Indication of selected parameters and measured quantities. Push Buttons: Selection of parameter to be adjusted, quantity to be measured and adjustment of parameter values. Where; <SELECT / RESET> <UP> <DOWN> <ENTER> <TRIP> Selection of the parameter to be set and the relay quantities to be measured. Continuous pressing as the reset function. Increment of the setting values for the parameter selected. Decrement of the setting values for the parameter selected. Storage of the setting values for the selected parameter. Testing of the output relay circuits. 2/5/96 10 MRI-V 01/96H

14 6.2 Relay setting principles There are eight relay parameters that can be set in the MRIV: Isn IsL CHAR I> ti> I>>N I>>L ti>> V - Value of the overcurrent step during normal operation - Value of the overcurrent step during undervoltage. - Current time characteristic for the overcurrent relay. - Tripping time delay for definite time overcurrent relay or the time multiplier for the inverse time overcurrent relay. - Current setting for the high set stage of the phase overcurrent relay. - Value for the fast short circuit tripping during undervoltage. - Tripping time delay for high set stage. - Tripping value for undervoltage supervision. By pressing the <SELECT/RESET> push button, the parameter to be modified is reached. The corresponding LED illuminates on the curve and the present set value of the selected parameter is indicated on the display. This set value may then be increased or decreased by pressing the <UP> or <DOWN> buttons respectively. The selected set value is only stored after pressing the <ENTER> push button and inputting the correct password. This means that adjustment of the unit is only possible by authorized users Password protected parameter adjustment The adjustment of all relay settings are password protected, however, to enable ease of adjustment, for authorized users, application of the password is usually only required once for multiple parameter adjustment. The following step by step sequence is given to illustrate the implementation of the password protection facility, where a new relay setting is to be applied: After the present setting value has been selected and changed using the <UP>, <DOWN> push buttons, the <ENTER> push button should be pressed. The message <SAV?> appears on the display, to confirm that the new setting value is to be saved. After pressing <ENTER> again, the password will be requested. The message <PSW?> is displayed. After the password has been given correctly, as indicated by the message <SAV!>, the new setting value may be stored by pressing the <ENTER> push button for at least 3 seconds. The new setting parameter then reappears on the display. A password consists of four push button operations. The pressed push buttons and their sequence define the password. If the four push buttons are defined by the following symbols: <SELECT> = S <DOWN> = <UP> = <ENTER> = E Then a password " E S" is achieved by the following sequence: <DOWN> <ENTER> <UP> <SELECT>. 2/5/96 11 MRI-V 01/96H

15 After a password is given correctly, parameter setting is permitted for five minutes. Subsequent parameter setting made within the five minute period after the password was inputted, does not require renewed password entry. Furthermore, the valid period for parameter setting is automatically extended for a further 5 minutes after each push button operation. If no push button is pressed within the 5 minute period then the validity of the password will be suspended. To enter further parameters after this period re-application of the password is required. During the 5 minute period when changes may be made, a new set value, acknowledged by <SAV?> then <SAV!>, may be stored by pressing <ENTER> for approximately 3 seconds. 6.3 Setting procedure The following sections describe in detail the setting of all relay parameters Starting current for phase overcurrent relay (Isn and Isl) The displayed setting value for these parameters are related to the nominal rated current (IN) of the relay. Thus; Starting current (Isn) = Displayed Value x Rated Current (IN) e.g. If Displayed Value = 1.25, then Isn = 1.25 x IN The setting of the Isl value is indicated by the I> LED flashing Time current Characteristic (CHAR I>) By setting this parameter, one of the following four options is displayed: DEFT NINV VINV EINV - Definite Time - Normal Inverse - Very Inverse - Extremely Inverse Any one of these four characteristics can be chosen by using the <UP> <DOWN> keys and can be stored by pressing <ENTER> Tripping time delay or time multiplier for overcurrent (ti>) After the time/current characteristic has been selected, the time delay (or time multiplier) should be changed accordingly. In order to avoid an unsuitable arrangement of relay modes the following precautions are taken: Adjustment of the time delay setting is automatically prompted for after a change in the set time/current characteristic. LED ti> flashes yellow to remind the operator to change the time delay setting accordingly. After pressing the <SELECT> push button, the present time delay setting value is shown on the display. A new setting value may then be entered. If the relay characteristic has been changed (e.g. from DEFT to NINV), but the time delay setting has not, the relay will, after 5 minutes, automatically set itself to the most sensitive time setting value available for that selected characteristic. The most sensitive time setting value implies the fastest tripping for the selected relay characteristic. If the time delay or the time multiplier is set out of range, "EXIT" appears on the display, and the low set stage of the relay is blocked. 2/5/96 12 MRI-V 01/96H

16 6.3.4 Current setting for high set overcurrent stage (I>>) The current setting value of this parameter is related to the nominal rated current of the relay. Thus; I>> = Displayed Value x Rated Current (IN) e.g. If Displayed Value = 20, then I>> = 20 x IN The high set stage of the overcurrent relay is blocked if the setting value is set to "EXIT" Tripping time delay for high set overcurrent stage (ti>>) Independent from the chosen tripping characteristic for I>, the high set stage I>> always has a definite time tripping characteristic. An indication value in seconds appears on the display Setting of the Undervoltage Switching Point The voltage setting value of this parameter is related to the nominal rated voltage of the relay, Vn. Thus; Undervoltage Switching Point, V = Displayed Value x Vn e.g. If Displayed Value = 0.5, then V = 0.5 x Vn The setting of the undervoltage switching point value is indicated by the LED flashing Reset & Dwell If co-ordination with electromechanical relays is required trst should be set to 60s, ttrip to Auto. Otherwise trst should be set to 0, ttrip to 20mS Nominal frequency The FFT Algorithm employed requires the nominal frequency as a parameter for correct digital filtering of the input currents. By pressing <SELECT> the display shows "f=50" or "f=60". The desired nominal frequency may then be selected and stored. 6.4 Indication of measured values and fault data Indication of measured values Any one of the following measured quantities may be indicated on the display during normal service by pressing the <SELECT> button: Current in Phase 1 (LED L1 green) Current in Phase 2 (LED L2 green) Current in Phase 3 (LED L3 green) Phase to Phase Voltage, V12 (L1, L2 and V LED's Green) Phase to Phase Voltage, V23 (L2, L3 and V LED's Green) Phase to Phase Voltage, V31 (L3, L1 and V LED's Green) The relevant operating values of the individual measured quantities are indicated on the display and are referred to the rated current and voltage. 2/5/96 13 MRI-V 01/96H

17 6.4.2 Indication of fault data Visual indication of faults detected by the relay is given on the front panel. The three phase LEDs L1, L2, L3, the undervoltage LED, as well as the function LEDs I>, and I>> are used to indicate/specify fault events. When a fault initiates a relay function, the corresponding function LED illuminates yellow. At the same time, the phase LED(s) flash(es) red to indicate the faulty phase or phases. After the set time delay has elapsed, the relay trips and the LED(s) for the faulty phase(s) become a constant red. The function LED remains illuminated. The fault currents measured at the instant of trip are recorded in registers for fault indication. After the occurrence of a trip, fault data for all three phase currents may be displayed in turn by repeatedly pressing the <SELECT> key. After all phases have been indicated, the LEDs return to red indicating the fault event. By pressing the <SELECT/RESET> button for approximately 3 seconds the relay is reset to its original status. If however, the relay was initiated by the occurrence of a fault, which then fell below a detectable level, a slowly flashing LED corresponding to the detected fault is displayed. This can also be reset using the <SELECT/RESET> button. 6.5 Test Trip The whole tripping circuit of the protection system may be tested by simulating a fault with the <TRIP> push button. This button is also used to interrogate the relay for its software version number. A single press reveals the first half of the software version number and a second press reveals the second half. A third press will be responded to by <PSW?>. Entering the correct password will be responded to by <TRI?>. Pressing <TRIP> again energizes all output relays in turn with a delay time of 1 second. All relays will stay energized until manually reset. 6.6 Reset There are two ways in which to reset the MRI-V relay: Hand reset By pressing the <SELECT/RESET> for approximately 3 seconds the relay is reset Auto-reset at Power Up After loss of supply voltage and upon its reconnection the unit resets itself and displays P&B. This resetting of the unit does not effect the set parameters which are stored in an EEPROM. 6.7 Setting value calculation In order to ensure that protection relays form an integral part of any system, a full protection coordination study should normally be undertaken which considers both upstream and downstream equipment. Further details may be obtained by contacting P&B Engineering. 2/5/96 14 MRI-V 01/96H

18 7. Relay case The MRI-V is delivered in an individual case for flush mounting. 7.1 Individual case The MRI-V is supplied in a UK manufactured industry standard drawout case suitable for flush mounting. For case dimension and cut-out, refer to Technical Data. 7.2 Rack mounting MRI-V relays may be supplied mounted in 19" racks if specified by the user. 7.3 Terminal connections The MRI-V plug in module is supplied in a case which has a very compact plug and socket connector. The current terminals are equipped with self closing short circuit contacts. Thus the MRI-V module can be unplugged even with current flowing without endangering personnel. 8. Test and maintenance Currents may be supplied to the input transformers to test the behaviour of the relay. By switching on test currents and measuring the tripping time, the whole system can be accurately tested. A portable overcurrent test case can be supplied which is suitable for testing the MRI-V. All measuring input circuits of the MRI-V are of static design and the relay functions are fully digitized. Thus, the MRI-V has no particular demand on maintenance. 2/5/96 15 MRI-V 01/96H

19 9. Technical Data 9.1 Measuring Input Circuits Rated Data Rated current, IN Rated voltage, VN Rated frequency, fn 1A or 5A 110V, 230V or 400V 50Hz, 60Hz Power IN = IN = 5A In voltage circuit 0.2 VA 0.1 VA < 1 VA Thermal withstand Half wave for 1 second for 10 seconds Continuously In voltage circuit 250 x IN 100 x IN 30 x IN 4 x IN 1.2 x VN 9.2 Auxiliary power supply Supply Voltage Vaux = 24V or Vaux = 110V or in a range from 16V to 60V AC in a range from 16V to 80V DC in a range from 50V to 270V AC in a range from 70V to 360V DC Power Consumption Quiescent Approx. 3W Operating Approx. 6W 9.3 Common data Drop Off/Pick Up ratio >97% Drop Off time 30mS Time Lag error ± 10mS Minimum operating time 30mS Transient over-reach 5% Factors effecting current measurement: Auxiliary voltage No changes measured Frequency harmonics in the range 0.9 < f/fn < 1.1 = < 0.02% /Hz Up to 20% of the third harmonic = < 0.08% /Hz Up to 20% of the fifth harmonic = < 0.07% /Hz Factors effecting delay times:- No influences could be measured. 2/5/96 16 MRI-V 01/96H

20 9.4 Setting ranges and steps Definite time phase overcurrent relay Setting range / step Tolerance I> Isn; IsL ti> x In / 0.05; 0.1 x In s / 0.01; 0.02; 0.05; 0.1; ± 5% from set value ± 3% or ± 10mS 0.2; 0.5; 1.0; 2.0; 5.0 seconds I>> I>>N; I>>L ti>> x In / 0.1; 0.2; 0.5; 1.0 x In s / 0.01; 0.02; 0.05s ± 5% from set value ± 3% or ± 10mS V V % Vn / 5% x Vn ± 5% from set value Inverse time phase overcurrent relay Characteristics according to IEC or BS 142 Normal Inverse t = 0.14 ti> [s] (I/IS) Very Inverse t = 13.5 ti> [s] (I/Is) - 1 Extremely Inverse t = 80 ti> [s] (I/Is)2-1 Where: t = Tripping Time ti> = Time Multiplier I = Fault Current Is = Starting Current Inverse time phase overcurrent relay setting ranges and steps Setting range / step Tolerance I> Isn; IsL ti> x In / 0.05; 0.1 x In / 0.01; 0.02; ± 5% from set value ± 3% or ± 10mS I>> I>>N; I>>L ti>> x In / 0.1; 0.2; 0.5; 1.0 x In s / 0.01; 0.02; 0.05s ± 5% from set value ± 3% or ± 10mS V V % Vn / 5% x Vn ± 5% from set value 2/5/96 17 MRI-V 01/96H

21 9.5. Inverse time characteristics Normal Inverse Extremely Inverse Very Inverse Definite Time I/I s 2/5/96 18 MRI-V 01/96H

22 9.6 Output contact ratings Number of relays = 4 Contacts Maximum breaking capacity 250V AC / 1500VA / continuous current 6A = 2 change over contacts for trip signal, I> alarm, & I>> alarm. 1 change over contact for self supervision. for DC voltage: ohmic L/R = 4ms L/R = 7ms 300 V DC 0.3 A / 90 W 0.2 A / 63 W 0.18 A / 54 W 250 V DC 0.4 A / 100 W 0.3 A / 70 W 0.15 A / 40 W 110 V DC 0.5 A / 55 W 0.4 A / 40 W 0.2 A / 22 W 60 V DC 0.7 A / 42 W 0.5 A / 30 W 0.3 A / 17 W 24 V DC 6 A / 144 W 4.2 A / 100 W 2.5 A / 60 W Max. rated making current: mechanical life span: electrical life span: Contact material 64A(IEC65) operating cycles operating cycles at 220 V AC / 6A Silver Cadmium Oxide (AgCdO) 9.7 System data Design standard = IEC 255-4, BS 142 Operating temperature range = -20 C to 70 C Storage temperature range = -40 C to 85 C Relative humidity = 40 C for 56 days Test Voltages to EN , EN Isolation Test = 2.5kV / 50Hz / 1 min. Impulse Test = 5kV, 1.2 / 50mS, 0.5J High frequency interference Test = 2.5kV / 1MHz Burst transient Test = 4kV / 2.5KHz, 15mS ESD Test = 8kV RFI Suppression Test = 10V/m, MHz, 1 Octave/ 3 min. EMI Suppression Test = 10V/m Mechanical Tests: Shock = IEC 41B (CO) 38, Class 1 Vibration = IEC 41B (CO) 35, Class 1 Degree of Protection Weight = Front - IP52 Rear - IP00 = Approx. 2kg. 2/5/96 19 MRI-V 01/96H

23 9.8 Housing Throughout the MR series range a modular housing system has been employed, utilizing the latest high quality UK manufactured industry standard case components. This approach affords maximum flexibility for both the relay scheme designer and the maintenance engineer. The relay modules are fully withdrawable for ease of maintenance and where applicable incorporate automatic short-circuiting CT connections to avoid dangerous open circuit CT overvoltages. A clear plastic front cover is provided for inspection purposes. MRI-V units are supplied in standard height (179mm 7in.) cases, complying with IEC 297 size 4U. The rigid case wall is manufactured from a single sheet of hot dipped galvanized steel coated externally with Plastisol PVC and internally with a low gloss alkyd paint finish. This construction technique provides improved thermal transfer characteristics over plastic walled cases and combines exceptional corrosion and flame resilience with good electromagnetic and electrostatic screening properties allowing many relays to be freely situated in close proximity and hazardous environments. When the relay is inserted a leaf spring along the top edge of the module makes contact with a solidly bonded nickel plated steel strip on the interior of the case, providing excellent earth continuity. This strip is brought out at the rear of the case, above the terminal block, where it forms a separate earthing terminal. A rigid front mounting flange is provided allowing the entire range of standard cases to be flush mounted without alteration. These flanges are also used to mount the relay inspection cover which is secured by thumbscrews. Securely bonded channels can be provided on the top and bottom surfaces toward the rear of the case allowing large rigid assemblies to be created by the use of joining strips located in these channels. This uniform but highly flexible housing system integrates excellent mechanical strength with good electrical practice in industry standard sizes HOLES 4.4mm DIAMETER OPTIONAL PANEL CUT OUT FLUSH MOUNTING FIXING DETAILS Min PUSH BUTTON PROJECTION 10mm NOTE Minimum gap between vertical spacing is required in order to withdraw relay from the case above. 32 OPTIONAL 212 Clearance 25 min Required to open case NOT SHOWN TO SCALE OPTIONAL SIZE 100 CAS 2/5/96 20 MRI-V 01/96H

24 9.9 Terminal Connection Details The rear terminal block accepts both pre-insulated screw and push-on blade type connectors which may be used singly or in combination. Each terminal has 1 screw type and 2 blade type connectors. Screw: Blade: Combinations: Each connection uses a 4mm (M4) screw outlet and accepts standard L-shaped ring type connectors designed for 4mm screws. Each connection facilitates 2 pre-insulated push-on blades 4.8mm wide 0.8mm thick complying with BS5057. Each terminal will accept either; 2 ring type connectors or 2 push-on blade type connectors or 1 ring type connector & 1 push-on blade type connector Earth Each terminal screw & 2 spade Rear terminal block connections. All information subject to change without notice Publication number MRIV-02/96H 2/5/96 21 MRI-V 01/96H

25 10. Order Form Digital Multifunctional Relay for Voltage Controlled Overcurrent Protection MRI-V MRI-V Rated Current, 1A 1 5A 5 Rated Voltage, 100 V (110V) V (240V) V (415V) 4 Power Supply, 24V (16-60Vac, 16-80Vdc) L 110V (50-270Vac, Vdc) H Data Communications, RS485 R Housing, 19" Rack Flush Mounting A D PBSI Ltd Trading as P&B ENGINEERING Bell Vue Works, Boundary Street, Manchester. M12 5NG. Tel: Fax: /5/96 22 MRI-V 01/96H

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