internal arc monitor system descriptive and operational handbook
Contents
1.2. Fig 4 MAI2 User Manual Page 11 27 Code 4 056 revO gt BOHERDI ELECTRONICA 4 Starting up the system 4 1 Configurations and tests Verify optical interconnections using a camera flash or a lamp Light detectors respond to sudden changes from a weak or medium light to a strong light responding to the increment of light intensity They do not respond to permanent light Test the equipment with a flash of light to the interior of the compartment verify the signal reach the monitor and verify also the appropriate input number in display The test can also be performed turning a lamp on next to the light captor If the current CORRIENTE jumper is in the CON position in the logic board See fig 5 an overcurrent is needed to produce trip signals However the display will indicate the number of the last activated receptor regardless if it has not tripped until the push button switch is RESET Any flash activating any of the 8 inputs 35 to 42 is repeated by the 33 optotransmitter and registered in the display The numbers 43 44 or 45 inputs can be preset with the RECEPTOR jumper to work as a light arc input when in the light LUZ position or as overcurrent information input in the current CORRIENTE position See fig 5 When in the light LUZ position the only function of the electronic logic board is to retransmit the flash on 33 transmitter It is not registered in the display When it is i
3. gt BOHERDI ELECTRONICA INTERNAL ARC MONITOR SYSTEM DESCRIPTIVE AND OPERATIONAL HANDBOOK MAI2 User Manual Page 1 27 Code EB4 056 0 E 3 BOHERDI ELECTRONICA INDEX 1 Introduction 2 Technical data 2 1 MAI2 2 2 2 2 3 Testing 3 Installation 3 1 optical fibers 3 2 Wiring 3 3 Assembly 4 Starting up the system 4 1 Configuration and tests 4 2 Calibration 5 System description 5 1 Composition 5 2 Operation 5 3 Precautions 5 4 Interpretation of numeric indications 6 Dimensional blueprint MAI2 CC 7 Dimensional blueprint MAI2 SC 8 Blocks diagram MAI2 CC TR 9 Blocks diagram MAI2 CC TC 10 General blueprint MAI2 11 Dimensional blueprint MO2 12 Blocks diagram MO2 13 Typical wiring MAI2 MO2 MAI2 User Manual Page 2 27 Code 4 056 revO gt BOHERDI ELECTRONICA 1 Introduction The internal arcs by accident bad contacts and other contingencies causing electrical failures are one of the most severe problems for low middle and high voltage electrical switchgears worst effects of these arcs are serious injuries or death extended damage to installations and rendering the equipment unavailable for prolonged periods of time The preventive actions must be based on knowledge of the internal arc phenomena and measures to overcome such event To summarize the following points can be expressed as the
4. O Fibra ptica o Borne el ctrico 21 CONTACTOS DE ALARMA Y 23 SE ALIZACI N 24 8 9 DISPAROS TRASISTORES LIBRES DE POTENCIAL 10 11 12 13 14 15 16 Page 21 27 4 BOHERDI ELECTRONICA lt gt 9 Blocks diagram MAI2 CC TC 8 ENTRADAS DE OwI a nm n s rm O a anayas e DESTELLO PO 7770777 E ee ee i s Fibra ptica 35 HL 36 jc Borne el ctrico DISPLAY 37 FILTROS BCD A as Y 39 GO Tos 40 60 a a HU DCTAVD O 47 n S BIESTABLE INHIBICI N I EMISDR REPETICI N so lt RECEPTOR AMPLIFICADOR BIESTABLE OF REPETIDOR DE ARCO f D SOBRE as f CORRIENTE l EMISOR DE 34 F 59 E l LED VERDE CORRIENTE 21 25 22 CONTACTOS DE 3E ALARMA Y DETECTOR 23 SE ALIZACI N ENTRADAS DE CORRIENTE SOBRE 24 DE CORRIENTE f PROTECCION 28 gt 29 PRUEBA I db 30 A h ALARMA I 17 74 BOBINADO HC ABIERTO 18 q I Corriente T PLADORES l RESET TRIAC 1 l I lt gt 9 I BIESTABLE sl ALARMA 19 amp MA G I Ine I DISPAROS SOBRE 220 E I TT TRIACS CORRIENTE I LED VERDE I 79 11 LIBRES DE DEE TRIAC 3 POTENCIAL Fuente 12 pit L I DPTOACD 12 ALIMENTACI N i HERBES 9 13 3 4 GN L 2
5. CC TR 8 ENTRADAS DE DESTELLO 33 3b 37 38 39 40 41 OCTAVO CAPTOR EMISOR REPETICI N ARCO RECEPTOR DE ARCO O SOBRE CORRIENTE EMISOR DE SOBRE CORRIENTE ENTRADAS CORRIENTE DE PROTECCION ALARMA ECBINADO ABIERTO ALARMA SOBRE CORRIENTE ALIMENTACI N ALARMA FALTA DE ALIMENTACI N MAI2 User Manual Code EB4 056 0 Detectores an QA FILTROS a TE r lees aca EZ DISPLAY Onn E ELS INHIBICI N E E Hig lt AMPLIFICADOR 43 REPETIDOR 4 44 El T 45 CORR ll die 4 e LED VERDE I 25 i R CL T DETECTOR y DE 16 S SOBRE CORRIENTE i E 2g 7 I PRUEBA n 30 y 17 NC 18 45 Corriente RESET f BIESTABLE 19 de e ju I i LED VERDE E 1 2 L EH 34 Un C3 1 FUENTE E 5 E d 59 4 BOHERDI ELECTRONICA c O n c s lt n a _ n Y eee eee eee eee eee LED AMAR BCD A 7 SEGMEN TOS BIESTABLE BIESTABLE DISPLAY RESET DPTDOACD PLADORES PLADORES Disparos La nmn una La Lr E LF Ab ABE
6. basic criteria for the electrical switchgears safety 1 Preventive measures in the design 2 Limit the time of the arc 3 Toleration of the increment in pressure 4 Toleration of the increment in temperature A good design shall include a sum of mechanisms to prevent the occurrence of internal arcs or to minimize its effect in the personnel and the equipment In general three stages can be established in the internal arc processes 1 Compression stage production of a fast overpressure without gas emissions 2 Emission stage Gases are generated 3 Fusion stage Solid material is thermally affected To prevent risks of overpressure and material fusion the activated mechanisms shall interrupt the arc less than 50ms milliseconds If we consider that the overcurrent protection response time for Medium Voltage is in the order of a second is easy to conclude that to protect the personnel it is necessary to mechanically reinforce the switchgear adding a considerable cost That is why BOHERDI ELECTR NICA has developed its MAI2 Internal arc Monitor an intrinsic protection independent of adjustments and coordination of other protections with its own detection and activation times in the order of 1 millisecond which added to the breaker actuation time represents a value below 50 milliseconds fundamental to limit or prevent any material damage and to protect the personnel with an inferior cost of mechanicall
7. optical transmitter 34 5 2 4 Trips The trip board for the equipment with TC version have four potential free triacs to electrically excite the control coils of the power breakers and remote trip optotransistor The trip boards for the TR version has five potential free transistors for both uses 5 2 5 Arc system alarm Each arc detection system provides the following alarms Internal arc Monitor MAI2 Internal arc protection with two normal open relay contact outputs NO Overcurrent detection with normal open optotransistor output NO Open coil alarm with normal close optotransistor output NC Power supply failure alarm with normal close optotransistor output NC Optical Mixers MO2 Power supply failure alarm with normal close optotransistor output NC 5 2 6 Boards description signaling a Power supply board The correct functioning of the power source is indicated with a yellow led on and low impedance between 5 6 terminals If the power source fails or is interrupted the current between those terminals are interrupted generating an alarm signal NC logic b Tripping board This board generates the power trips to open breakers and also trips for teleprotection The trip pulses last approximately 200ms Current board When the sensed current surpasses a predetermined threshold a green led is MAI2 User Manual Page 17 27 Code 4 056 0 gt BOHERDI ELECTRONICA ON and
8. temperature 12 60 C MAI2 User Manual Page 6 27 Code EB4 056 0 gt BOHERDI ELECTRONICA Tripping outputs TC version Maximum current permanent 1 A Maximum current 200 ms 5 A Maximum start current 10 A Minimum maintenance current 50 mA Leakage current 220Vca 50Hz 8 mA Maximum voltage 400Vdc 250Vca Maximum current permanent 5 Maximum start current 10 A Leakage current 200Vdc 0 5mA Maximum voltage 250Vdc Admissible max current 80mA Admissible max votage 250V Breaking capacity max 220Vac Breaking capacity max 220Vdc 125mA Admissible max current 20mA Admissible max voltage 250V Nominal current In 165A Consumption 0 5VA Max permanent current 2 x In Max current per 1 second 175A Tripping threshold 1 5 to 3xIn From arc to tripping ams From overcurrent input to overcurrent 0 3ms output 2 2 1 MO2 general characteristics Characteristics Brand Boherdi Electr nica Model MO2 Functioning type Electronic Service type Permanent MAI2 User Manual Page 7 27 Code EB4 056 revO gt BOHERDI ELECTRONICA optical inputs Quantity 3 optical outputs Light arc repetition 1 Power failure alarm Quantity 1 NC Visible indicators Power supply ON Yellow Led Height 93mm Width 76mm Depth 114mm 2 2 2 2 electrical characteristics Characteristics Power voltages 48 110 220 Vcc 220 consumption 2W Admissible environmental t
9. the overcurrent alarm is activated continuity exits between terminals 19 20 These signals are registered and are cancelled pressing RESET on the front of the same board Confirmation of continuity in the three secondary coils of the current transformers is done by an optotransistor normally ON and stop conducing to signal an alarm NC logic The test PRUEBA push button simulates a current higher to the threshold and its purpose is to corroborate the overcurrent communication signal to other monitors interconnected with optical fibers d Logic board The green led ON indicates reception of overcurrent information This signal is not registered The red led turns on when trip signal is issued This last signal and the alarm signal are registered Those can be cancelled with the reset push button in the front of the same board When a number is registered in the 7 segments display of any of the monitors the respective listing has to be checked to relate such number with the corresponding sensor or the signal reception fiber for such installation to track or monitor the signals reaching the arc monitor These will allow you to know in which cell the arc was produced or to which equipment corresponds in the case of a repeated signal 5 3 Precautions IMPORTANT If for any reason is necessary to extract and reinstall a board of an arc monitor while the equipment is already installed and operating the power source to the monitor m
10. 056 revO ESO aa gt BOHERDI ELECTRONICA Fig 7 MAI2 User Manual Page 15 27 Code EB4 056 0 gt BOHERDI ELECTRONICA 5 System description 5 1 Composition The system includes BOHERDI Brand Arc Monitors and Optical Mixers with MAI2 CC MAI2 SC and 2 respectively models MAI2 systems have optical inputs and outputs visible indicators overcurrent sensor model CC alarm outputs and a configurable operation logistic MO2 systems allow to unify signals from 3 arc sensors frequently using sensors from a same cell This implies savings in optical fiber quantity and simpler wiring 5 2 Operation 5 2 1 Signals inputs The protection system works detecting the light in sensors located in each monitored compartment To release the tripping order the overcurrent is verified in an input cell 5 2 2 Overcurrent detection The overcurrent is individually detected by measuring each fase current from the CT input The current board verifies the intensity level comparing it with a preset value and if this value is exceeded produces a tripping habilitation of appropriate monitors The connections are made with 25 26 terminals for phase 27 28 for S and 29 30 for T 5 2 3 Inhibition operation Each logic board has an inhibition INHIBICI N jumper assigned to it If jumper is in yes 51 position the arc light enters from the eighth input 42 produces electrical excitati
11. Introduce the optical fiber all the way in and gently press the fastener or clamp Then replace the board in its original position put the fibers in the output channels and close the plastic box guiding the fibers to maintain their positions within each channel and outputting from the front of the hole See fig 4 After this introduce the box in the monitor For the Optical mixer remove the plastic box cap loosen the fastener of the appropriate receptor or emitter introduce the optical fiber all the way to the end and gently press the fastener or clamp hen reposition the mixer cap guiding the fibers to follow the existing guides in the cap on both sides of the terminals fig 4 MAI2 User Manual Page 9 27 Code EB4 056 0 4 BOHERDI ELECTRONICA lt gt The optical connections between a monitor and a mixer or two mixers will always be between an optical emitter and an optical receptor The finishing on the ends of the optical cables are always done as previously described with straight and plane cuts OPTORRECEPTOR OPTOEMISOR Y AM TUERCA 8 FIBRA CON CORTE gp RECTO y 3 FIGURA 1 FIGURA 2 CAPTOR OPTICA 6 AGUJEROS DIAMETRO 4mm SOPORTE DE CAPTOR FIGURA 3 3 2 Wiring See typical wiring in blocks diagram and blueprint 3 3 Assembly See dimensional diagrams for MAI2 y 2 MAI2 User Manual Code EB4 056 0 m F lt BOHERDI ELECTRONICA
12. RUEBA button an overcurrent signal is transmitted to verify its reception When stop pressing the testing button the transmission is interrupted and the green led from logic boards local and remote are turned off indicating nonexistence of overcurrent in the system however an overcurrent alarm is registered terminals 19 and 20 and local green led in the current board is ON To reset these indications press RESET button on same current board although this action is not necessary for the correct operation of the system MAI2 User Manual Page 13 27 Code EB4 056 revO gt BOHERDI ELECTRONICA DISPAROS 12 5 DISPARO 5 DISPARO 4 DISPARO 3 ZONA DE INHIBICI N DISPARO 2 DISPARO 1 Fig 6 4 2 Calibration The only calibration done in the system is the current threshold calibration on the current board The adjustment is made injecting the corresponding current in one phase and adjusting the Preset potentiometer in the current board until the Led is on or off See fig 7 The adjustment can be tested for the other 2 phases one at the time A simultaneous test for the three inputs has to be three phased The precision of the threshold adjustment is to the order of 5 since it is not a measurement but a confirmation that the current has an abnormal value For this reason a single adjustment for all three phases was elected for the system MAI2 User Manual Page 14 27 Code 4
13. emperature 12 60 C Power loss alarm optotransistor Admissible max current 20mA Admissible max tension 250V Operating times From arc to light repetition lt ims 2 3 Tests Temperature and humidity cycles tests under the following standards IEC 68 2 38 Test Z AD Composite temperature humidity cyclic test IEC 68 2 31 Ec Drop and topple primarily for equipment type specimens IEC 68 2 32 Ed Free fall IEC 68 2 6 Fc Vibration sinusoidal Electromagnetic tests under the following standards IEC 255 5 Insulation tests for electrical relays IEC 255 22 1 1Mhz burst disturbance tests IEC 61000 4 2 Electrostatic discharge immunity test MAI2 User Manual Page 8 27 Code 4 056 0 gt BOHERDI ELECTRONICA 3 Installation 3 2 optical fibers The optical cables are single wire acrylic fibers of 1mm diameter optical cable comes out from each anti arc cell compartment to the monitor or optical mixer The following procedure is implemented to prepare the fibers that are attached to the captor endings About 3mm of the cable outer jacket is removed without damaging the optical conductor nested in its interior shaping it with a sharp tool giving a conic form to the end of the conductor The finishing tool needed is a piece of fine sand paper 150 The cone is dry polished giving to it an approximate 90 angle 45 in relation to the cable axle see fig 2 E
14. i FUENTE 1 i 14 E 15 ALARMA I 5 gt t 1 FALTA E NC I m DISPARO DE T I TELEMANDO ALIMENTACI N T LED AMAR b P 16 t TRANSISTOR MAI2 User Manual Page 22 27 Code EB4 056 0 gt BOHERDI ELECTRONICA 10 General blueprint MAI2 reset Led verde sonrecomante Led ro dsparo Pusador Display CN 1 8 5 45 5 Eos E E E 5 2 5 E E E 3 c MAI2 User Manual Page 23 27 Code EB4 056 revO 23 gt BOHERDI ELECTRONICA lt gt 11 Dimensional blueprint MO2 BOHERDI ELECTRONICA lt gt 12 Blocks diagram MO2 Entradas de luz por fibras pticas Amplificador repetidor Emisor 4 O Borne el ctrico m Conector fibra ptica MAI2 User Manual Code EB4 056 revO Entrada de alimentaci n Salida de alarma Page 25 27 23 gt BOHERDI ELECTRONICA lt gt 13 Typical wiring MAI2 MO2 P 2 Q SS S F call m MAI2 User Manual Page 26 27 Code 4 056 revO gt BOHERDI ELECTRONICA lt gt TECHNICAL SERVICE HELP DESK PHONE 54 11 4925 4843 54 11 4923 9060 FAX 54 11 4923 5595 ventas O boherdi com ar Address Mu iz 1858 Buenos Aires Capital Federal Rep blica Argentina CP 1255ACP MAI2 User Manual Page 27 27 Code EB4 056 0
15. liminate the the thin powder verify the interior of the captor does not contain foreign objects loosen the fastener and introduce the end of the fiber to the end Softly tighten the fastener or clamp end of the cable already prepared as indicated before is screwed with its support see fig 3 in the interior of the compartment with the appropriate orientation Trying during installation that the distance of the optical fiber within the cell is as short as possible with the only purpose to prevent a longer length is burned in case of an internal arc A curled reserve portion of cable can be left on the exterior of the cell to easily replace the burned cable after an arc The optical cable is installed in the same fashion than an electrical cable with the only special precaution to bend it with gentile movements that is with high ratio curves As a guideline consider a 25mm as the minimum radio of a curve The termination and installation of the other end of the optical cable must be done as follows A straight cut without piling the fiber Sand paper the end to a 90 degree in reference to the axle of the cable with a sand paper 400 until obtaining a plane smooth face See fig 1 Remove the plastic box in the arc monitor that has the detectors DETECTORES identification Remove the board with the optodetectors and proceed with each optical fiber as follows Loosen the fastener from the appropriate receptor or emitter
16. n the current CORRIENTE position retransmit the information on 34 transmitter and utilises the data to decide to issue a trip signal The eighth light input 442 is very important since allows for certain selectivity in the electronic logic response by a third jumper called inhibition INHIBICION See fig 5 When this jumper is on the NO position 42 input functions like the other 7 previous inputs When it is in the yes SI position is inhibited to retransmit to 33 transmitter the light entering through the 42 receptor Also if inhibition is activated no response will be detected in tripping outputs 3 4 5 the inhibition only affects the eighth input 42 Figure 6 shows a terminals outline Once confirmed the fiber unions responsible to conduct direct arc or retransmitted light it is possible to confirm the fiber unions conducting overcurrent The current board has 2 push buttons a testing PRUEBA and a RESET buttons Pressing the testing button mimic an overcurrent a green led lights up in that board also in the logic board and an overcurrent signal is transmitted on 34 transmitter This signal must reach other monitors from inputs numbers 43 44 or 45 and is indicated with the a green light on the logic board MAI2 User Manual Page 12 27 Code EB4 056 revO gt BOHERDI ELECTRONICA lt gt 4 dota RECEPTOR o ALI alg sh Fig 5 When pressing and holding the testing P
17. o replace and exchange he over current sensor is an extractable board in the monitor lt has an automatic short circuit connector input ending in a pass terminal This allows for replacing the board without affecting the functioning of other working protections The BOHERDI ELECTR NICA MAI2 Internal arc Monitor has been successfully tested under the IEC 60068 2 38 amp IEC 60255 5 norms and evaluated with satisfaction in an electric board internal arc test conducted by CEPEL MAI2 User Manual Page 4 27 Code EB4 056 0 gt BOHERDI ELECTRONICA 2 Technical Data 2 1 Models There are two internal arc Monitors each with to possible versions MAI2 CC This model includes an overcurrent sensor that detects not only the electric arc but also the presence of overcurrent The overcurrent signal is internally propagated and retransmitted via optical fiber so it can be used together with arc detection to generate the trip signals MAI2 SC This model does not include an overcurrent sensor However it can receive and use the overcurrent information generated in monitor model MAI2 CC The versions for each models are the following MAI2 XX TR The equipment includes a tripping board using transistors as the switching element appropriate with equipment with DC opening coils MAI2 XX TC The equipment includes a tripping board using triacs as the switching element appropriate with equipment with AC opening c
18. oils 2 1 1 General characteristics of MAI2 Characteristics Brand Boherdi Electr nica Model MAI2 SC MAI2 CC Functioning type Electronic Service type Permanent optical Inputs With numeric indication 8 Overcurrent Signal arc repetition 3 optical outputs arc light repetition Overcurrent signal repetition Tripping output TC version Quantity 4 Tripping output TR version Quantity 5 MAI2 User Manual Page 5 27 Code EB4 056 0 gt BOHERDI ELECTRONICA Tripping Optotransistor TC version Quantity 1 Tripping Alarm Quantity 2 NO Overcurrent Alarm mod CC Quantity 1 NOA Transducer current failure alarm mod CC Quantity 1 NC Power failure alarm Quantity 1 NC Visible Indicators Power supply on Yellow Led Monitor in alert status Decimal point ON in led display Flash detection 1 to 8 Numeric display Overcurrent detection Green Led Tripping Hed Led Controls at front Arc flash and tripping reset Push button Overcurrent reset mod CC Push button Overcurrent simulation mod CC Push button Internal board configuration Current jumper With Without Inhibition jumper YES NO Receptor jumper Current Light Threshold adjustment gt gt mod CC Preset Height 156mm Width 308mm Mod CC 231mm Mod SC Depth 201mm 2 1 2 MAI2 Electrical characteristics Characteristics Power voltages 48 110 220 Vcc 220 Vca Maximum consumption 15W Admissible environmental
19. on of only the first two trips 1 and 2 see fig 6 not the rest nor a light signal is transmitted on the light arc repeater from the optical fiber When the jumper is in the NO position five trips are electrically excited and the arc repetition is normally transmitted The rest of the inputs are not affected by this function when operated without inhibition 5 2 3 Signals Repetition Each arc monitor is capable of repeating arc light signals or overcurrent on the optical fibers The arc light entering from the eight optodetectors numbers 35 to 42 is repeated on arc optotransmitter 433 When the logic board RECEPTOR jumper is in the light LUZ position the arc optotransmitter 33 also repeats the arc light information entering optodetectors MAI2 User Manual Page 16 27 Code 4 056 0 gt BOHERDI ELECTRONICA numbers 43 44 or 45 The signal entering those optodetectors DO NOT produce electrical excitation of the system nor is registered in the display since is only repeated in a passing through mode The overcurrent signal is issued in the monitor equipped with current board This signal is repeated on the optical fiber from optotransmitter 34 To be received by another monitor must enter from either inputs numbers 43 44 or 45 and the HECEPTOR jumper must be in the current CORRIENTE position The overcurrent information is processed in the monitor logic operation board and is retransmitted by the overcurrent
20. ust be disconnected first With this action unwanted trips are prevented The power source can be disconnected by removing the power source board The power source can be reconnected after waiting two minutes which is the necessary time to discharge the capacitors The monitor has a high electrical capacity to maintain sufficient energy to allow trip signals even if an arc simultaneously cuts the power source of the monitor 5 4 Interpretation of numeric indications When a light sensor is on the display with the seven segments of the logic board indicates a digit from 1 to 8 which allows to identify the excited sensor or optical mixer If a light signal is received from one to another monitor the receptor arc monitor will also register the input number but in this case will not reference the sensor nor a mixer but the monitor that emitted the signal MAI2 User Manual Page 18 27 Code EB4 056 revO gt BOHERDI ELECTRONICA 6 Dimensional blueprint MAI2 CC HRack debe montarse respetando una distancia minima de entre el circuito rasero y el panel de montak MAI2 User Manual Page 19 27 Code EB4 056 revO gt BOHERDI ELECTRONICA lt gt 7 Dimensional blueprint MAI2 SC Rack debe respetando una dencia m nima de mate d circulo trasero y el panel de montage MAI2 User Manual Page 20 27 Code EB4 056 0 w w AAA AA l l l l 8 Blocks diagram MAI2
21. y reinforce the electric switchgears and with a higher efficiency BOHERDI ELECTR NICA system is based in the optical detection of the arc with luminescence sensors sensitive to quantities superior of 1000lux and transmitted via optical fibers to a photo transistor that transforms the light signal in electric signal MAI2 User Manual Page 3 27 Code 4 056 0 gt BOHERDI ELECTRONICA The optical fiber transmission immunize the system from interferences generated by the operation of other equipment in its proximity All components in the system are immunized and tested against electromagnetic noise interference eliminating the risk of untimely operation activation of the monitor which is a characteristic problem of systems transmitting the signal via cables Besides its high speed operation the system presents other advantageous characteristics Uses plastic optical fibers easy to install since allows a curvature radio higher or similar to 25mm The light captor is easy to apply to the end of the fiber since this one has a thread and a pressure nut by which is firmly attached Preparation for the end of the fiber does not require special tools only common good cutting tools This allows for the easy change of a light captor in the area where the arc was produced without needing to change the entire length of the fiber installed to the monitor Built in modules with plug in boards easy t
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