KRB Electronic Solutions

We are one of the trusted companies of Universal Relay Testing Kit. Our products are enormously admired in the market owing to their top features.

Objectives:

• Study of under voltage relay operation.Study of Over Voltage relay Operation.Study of Over current relay OperationTime characteristic of above relay.DC relaysTime characteristic at different TMSTo study of operating time.To Study of pick up.To Study drop off (reset level) .Flag or targetStudy of % error.

The KRB Digital Electronics Trainer is an essential tool for students and professionals alike, designed to enhance your understanding of digital electronics concepts. Featuring a user-friendly interface, this trainer allows for hands-on experimentation with various digital circuits, including logic gates, flip-flops, and counters. Its compact design and robust construction ensure durability, making it perfect for both classroom and home use. With comprehensive instructional materials included, you can easily grasp complex topics and elevate your learning experience. Invest in the KRB Digital Electronics Trainer to unlock your potential in the world of electronics.

Objective:
*For Studying the functional performance of under voltage Relay*For Graphical Plotting IDMT Characteristics of the RelayTechnical Specification:- A. RELAY: Under Voltage IDMTMAKE : ALSTOM/L&T/ABBCHARECTERISTICS : IDMT for Electromechanical relayP.T. SECONDARY VOLTAGE : 110 Volts AC 50Hz AUXILIARY VOLTAGE : 220 /110 /48 /24 Volts AC/DC B. RELAY TESTING KIT:Specification:
 Power input 220Volts AC 50Hz
 Secondary Voltage injection type
 Time interval meter  digital 199.9 seconds for measurement of trip time  Stop/Start timer Digital
 Circuit Breaker ON/OFF & Relay Trip Status Indicator/Buzzer
 Built in Variable voltage source Built in circuit breaker manual ON/OFF & Auto control
 Trip Status Indicator / Buzzer
 Power ON/OFF through MCB, Power on indicator
 Control Circuit for Voltage relay testing
 Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC
 Built in digital VoltmeterEducational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords .

Objective:
* For Studying Functional performance of  Over Voltage & Under Voltage Relay * For Graphical Plotting Characteristics of the Relay

KRB Make Distance/Impedance relayTesting Kit Inbuilt Relay ABB/ALSTOM/ASHIDA

üNecessary diagrams screen printed (gloss ink and oven treated )üNecessary BTI connectors / BS-10 / BS-2 Elcom make fitted.üBuilt in fuse protection and built in over current protection.üIlluminated power on / off rocker switch provided.(Elcom)üStart / stop / reset switch- (Elcom)üTrip status indicatorü24V SMPS source unit for Auxiliary*.ü230v AC source for AuxiliaryüDUC relay output ‘NO’ or NC’ connection facility.üNecessary patch cords and power cables provided. (Elcom)üLED are fitted at schematic itself for easy understand the operation.üControl relays and bases O/E/N or OMRONüContactors : Schneider Electric / ABB / Siemens.üTime interval internal / external selectable.üPotential free ‘NO’ and ‘NC’ point to be provided for project works.

The 5A Universal Relay Testing Kit is an essential tool for automotive and electrical professionals, designed to simplify the testing and diagnosis of relay systems. This comprehensive kit features a user-friendly interface, allowing for quick and accurate assessments of relay functionality. With its robust construction and versatile compatibility, it ensures reliable performance across various applications, making it an indispensable addition to your toolkit. Enhance your efficiency and precision in troubleshooting with this all-in-one relay testing solution.

The 5A Directional Over Current Relay Test Set is an essential tool for ensuring the reliability and accuracy of your electrical systems. Designed for precision testing, this device allows for comprehensive evaluation of directional overcurrent relays, ensuring they operate effectively under various conditions. With its user-friendly interface and robust construction, it provides accurate measurements and reliable performance, making it an indispensable asset for electrical engineers and technicians. Enhance your testing capabilities and maintain system integrity with this high-quality test set.

Relay Features:
 Numerical Relay (C&S/ Ashida/JVS) Make
 Very low CT burden
 Built-in provision for ratio and phase angle corrections without external interposing CTs
 Dual slope characteristic
 Stabilization against inrush
 Prevention of nuisance tripping during transient CT Saturation
 Stabilization against transient over-fluxing
 High-set tripping threshold
 Universal auxiliary supply
 Galvanic isolation between independent inputs
 Wide setting range                                                                                                                                                                                
 Dropout ratio > 96 %
 Returning time 50 ms
 Hi-Set Trip time <= 20 ms (Tolerance + 5ms)
 Hi-Set Pickup +/- 5%
 Differential Current Resolution 1% x In
 Differential Current Accuracy +/- 15 mA upto 40% of In, onwards +/-2%
 Low-Set trip time <=40ms (Tolerance + 5ms) Measurement Range 15% to 20 x In                                                                                                                                                                         
RELAY TESTING KIT: "KRB" MakeSpecification Power input 220 Volts AC 50 Hz
 Built in Variable Current injecting Regulator
 Secondary Current Injection type
 Trip status indicator / Buzzer
 Power ON/OFF through MCB, Power on Indicator
 Control Circuit for Differential Relay Testing kit
 Auxiliary power Supply to relay 220/110/48/24 Volts AC/DC
 Built in Circuit Breaker, Manual ON/OFF & Auto Control
 Built in Digital Voltmeter & Ammeter (48x96mm)Educational Bench Model with schematic diagram of the test circuit printed on the modelTest points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords .

Objective:* For Studying Functional Performance Of IDMT Directional Over Current Relay* For Graphical Plotting IDMT Characteristics Of The Relay.
Technical Specification:- Part A. RELAY: Over Current (Directional)MAKE: ALSTOM/L&T/ABB/JVSCURRENT RATING CT Secondary : 1 / 5 AmpsAUXILIARY VOLTAGE : 220/110/48/24Volts AC/DCPart B. RELAY TESTING KIT : "KRB" MakeFeatures:
• Secondary Current Injection type
• Power input 220Volts AC 50Hz
• Built in digital timer 199.9 seconds for measurement of trip time – Stop /Start timer Digital
• Trip Status Indicator/Buzzer
• Power ON/OFF through MCB, Power on indicator
• Variable Current injection power circuit
• Built in circuit breaker manual ON/OFF & Auto control
• Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC
• Built in digital AmmeterEducational Bench Model with schematic diagram of the test circuit printed on the modelTest points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through in reconnections of patch cards

Objectives:* For Studying Functional performance of Negative Sequence Relay * For Graphical Plotting DMT Characteristics of the RelayTechnical Specification:- Part A. Relay: Negative Sequence Relay (DMT) MAKE : ALSTOM /L&T/ABB/ELME  TRIP TIME CHARACTERISTIC : DMT Type  B. Relay Testing Kit: Features: Secondary Current Injection type  for measurement of trip time  Stop / Start timer digital Trip status indicator / Buzzer Power ON/OFF through MCB, Power on Indicator Control Circuit for Negative Sequence Relay Testing kit Auxiliary power Supply to relay 220/110/48/24 Volts AC/DC Built in Circuit Breaker, Manual ON/OFF & Auto Control  Built in Digital AmmeterEducational Bench Model with schematic diagram of the test circuit printed on the modelTest points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords

Objectives:* For Studying Functional performance of Negative Sequence Relay * For Graphical Plotting DMT Characteristics of the Relay Make"KRB"
Technical Specification:- Part A. Relay: Negative Sequence Relay (DMT) MAKE : ALSTOM /L&T/ABB/ELME  TRIP TIME CHARACTERISTIC : DMT Type  CURRENT RATING CT SECONDARY : 1/5 Amps  AUXILIARY VOLTAGE : 220/110/48/24 Volts AC/DCPart B. Relay Testing Kit: Features: Power input 220 Volts AC 50 Hz Secondary Current Injection type Time interval meter  digital 99.99 seconds for measurement of trip time Stop / Start timer digital Trip status indicator / Buzzer Power ON/OFF through MCB, Power on Indicator Control Circuit for Negative Sequence Relay Testing kit Auxiliary power Supply to relay 220/110/48/24 Volts AC/D Built in Circuit Breaker, Manual ON/OFF & Auto Control  Built in Digital AmmeterEducational Bench Model with schematic diagram of the test circuit printed on the modelTest points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords.

Objective:
For Studying Functional Performance of Buchholz Relay* For Graphical Plotting Characteristics Of The Relay Relay 

Objective:
*For Studying the functional performance of over voltage Relay*For Graphical Plotting IDMT Characteristics of the RelayTechnical Specification:- A. RELAY:Over Voltage IDMTMAKE : ALSTOM/L&T/ABBCHARECTERISTICS : IDMT for Electromechanical relayP.T. SECONDARY VOLTAGE : 110 Volts AC 50Hz AUXILIARY VOLTAGE : 220 /110 /48 /24 Volts AC/DC B. RELAY TESTING KIT:Specification:
 Power input 220Volts AC 50Hz
 Secondary Voltage injection type
 Time interval meter  digital 199.9 seconds for measurement of trip time  Stop/Start timer Digital
 Circuit Breaker ON/OFF & Relay Trip Status Indicator/Buzzer
 Built in Variable voltage source
 Built in circuit breaker manual ON/OFF & Auto control
 Trip Status Indicator / Buzzer
 Power ON/OFF through MCB, Power on indicator
 Control Circuit for Voltage relay testing
 Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC
 Built in digital VoltmeterEducational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords.

* For Studying the functional performance of under voltage Relay* For Graphical Plotting DMT Characteristics of the RelayTechnical Specification:- Part A. RELAY: Under Voltage DMT MAKE : ALSTOM/L&T/ABBCHARECTERISTICS : DMT for Static RelaysP.T. SECONDARY VOLTAGE : 110 Volts AC 50Hz AUXILIARY VOLTAGE : 220 /110 /48 /24 Volts AC/DC Part B. RELAY TESTING KIT: KR Make Specification: Power input 220Volts AC 50HzSecondary Voltage injection type Time interval meter digital 199.9 seconds for measurement of trip time  Stop/Start timer Digital Circuit Breaker ON/OFF & Relay Trip Status Indicator/Buzzer Built in Variable voltage sourc Built in circuit breaker manual ON/OFF & Auto control Trip Status Indicator / Buzzer Power ON/OFF through MCB, Power on indicator Control Circuit for Voltage relay testing Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC Built in digital VoltmeterEducational Bench Model with schematic diagram of the test circuit printed on the model. Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords.

For Studying the functional performance of over voltage Relay* For Graphical Plotting DMT Characteristics of the RelayTechnical Specification:- Part A. RELAY: OVER Voltage DMT MAKE : ALSTOM/L&T/ABBCHARECTERISTICS : DMT for Static RelaysP.T. SECONDARY VOLTAGE : 110 Volts AC 50Hz AUXILIARY VOLTAGE : 220 /110 /48 /24 Volts AC/DC Part B. RELAY TESTING KIT: KRB Make Specification: Power input 220Volts AC 50Hz Secondary Voltage injection type Time interval meter  digital 199.9 seconds for measurement of trip time  Stop/Start timer Digital Circuit Breaker ON/OFF & Relay Trip Status Indicator/Buzzer Built in Variable voltage source Built in circuit breaker manual ON/OFF & Auto control Trip Status Indicator / Buzzer Power ON/OFF through MCB, Power on indicator Control Circuit for Voltage relay testing Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC Built in digital VoltmeterEducational Bench Model with schematic diagram of the test circuit printed on the model. Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through interconnections of patchchords.

Specifications
1. Ratio error of CT rated for 5 Amp or 1 Amp with burden box
2. CT Test Set used For determination of Phase Angle Error

C.T TESTING SET.

For determination of Phase Angle Error and Ratio error of Current transformer rated for 5 Amp or 1 Amp with burden box. The ratio error in percentage and phase displacement in minutes displayed directly comparable and indictable. The C.T. Testing set having have the following ranges.

Objective:* For Studying Functional Performance Of DMT Under/Over Frequency Relay* For Graphical Plotting DMT Characteristics Of The RelayTechnical Specification:-                                                                                                       Part A. RELAY: Under/Over FrequencyMAKE:  ALSTOM/L&T/ABB CURRENT RATING CT Secondary :  1 or 5AmpsAUXILIARY and Frequency source Unit 0-60Hz.VOLTAGE  : 220/110/48/24Volts AC/DCPart B. RELAY TESTING KIT "KRB"  Make Features:• Secondary Current Injection type• Power input 220Volts AC 50Hz• Built in digital timer 199.9 seconds for measurement of trip time – Stop /Start timer Digital• Trip Status Indicator/Buzzer• Power ON/OFF through MCB, Power on indicator• Variable Current injection power circuit• Built in circuit breaker manual ON/OFF & Auto control• Auxiliary Power for Relay 220 /110  /48 /24 Volts AC/DC• Built in digital Ammeter                                                                                                        Educational Bench Model with schematic diagram of the test circuit printed on the model  Test points & measurement points brought out & connected to BTI 15/30    terminals, circuit setup for testing through in reconnections of patch cards.

Product Description:

• The DC network analyzer is design to analyze the fault currents in power system. The symmetrical and unsymmetrical fault analysis can be done with help of analyzer. The unit comprises with variable power supply sources, variable resistance, Milliammeter and ohmmeter. The unit is design with number of sections in power system. The sections are considered for general case. The unit will have two sections of alternators, two sections of sending end transformers with busbars, four sections of transmission lines, four sections of receiving end transformers with busbars and four load sections. The fault impedance diagram can be prepared on per phase basis for symmetrical faults and currents are calculated. The same can be analyzed with dc network analyzer panel. For the unsymmetrical faults, the sequence reactance diagrams are prepared and the positive, negative & zero sequence reactance diagrams are connected in series or parallel according to type of fault for fault current analysis. The DC network analyzer will give the simulated fault current in agnitude but the exact phase can not be found. The assumption is made that fault resistance is very small than the reactance. (i.e. Rf <<< XF) So the fault current is pure reactive & logging behind the phase voltage by 90. For analyzing currents with its phase and magnitude the AC network analyzer is required. The DC network analyzer is simple to operate, easy to understand and full proof with protections. The power supply units in analyzer can be independently used for other applications also. The power supply manual is enclosed separately. The DC network analyzer unit is totally enclosed, free standing, dustproof. The unit powder coated and screen printed for different section parameters.

Objective:* For Studying Functional Performance Of IDMT Earth Fault Relay* For Graphical Plotting IDMT Characteristics Of The RelayTechnical Specification:- Part A. RELAY: Earth Fault (Non-directional)MAKE: ALSTOM/AREVACURRENT RATING CT Secondary : 1 or 5 Amps AUXILIARY VOLTAGE : 220/110/48/24Volts AC/DCPart B. RELAY TESTING KIT : "KRB" Make
Features:
• Secondary Current Injection type
• Power input 220Volts AC 50Hz
• Built in digital timer 199.9 seconds for measurement of trip time – Stop /Start timer Digital
• Trip Status Indicator/Buzzer
• Power ON/OFF through MCB, Power on indicator
• Variable Current injection power circuit
• Built in circuit breaker manual ON/OFF & Auto control
• Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC
• Built in digital Ammeter Educational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through in reconnections of patch cards.

Objective:* For Studying Functional Performance Of DMT Over Current Relay and Earth Faault Relay* For Graphical Plotting DMT Characteristics Of The RelayTechnical Specification:- Part A. RELAY: Over Current and Earth Faul Relay Static Type (Non-directional)MAKE: ALSTOM/L&T/ABB CURRENT RATING CT Secondary : 1 or 5AmpsAUXILIARY VOLTAGE : 220/110/48/24Volts AC/DCPart B. RELAY TESTING KIT : "KRB" Make Features:Secondary Current Injection type Power input 220Volts AC 50Hz Built in digital timer 199.9 seconds for measurement of trip time  Stop /Start timer DigitalTrip Status Indicator/Buzzer Power ON/OFF through MCB, Power on indicator Variable Current injection power circuitBuilt in circuit breaker manual ON/OFF & Auto control Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC Built in digital Ammeter Educational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through in reconnections of patch cards.

The Digital Current Transformer Test Set is an essential tool for professionals in the electrical industry, designed to ensure the accuracy and reliability of current transformers. Featuring advanced digital technology, this test set provides precise measurements and easy-to-read displays, allowing for efficient testing and diagnostics. Its robust construction and user-friendly interface make it suitable for both field and laboratory applications, ensuring that you can maintain optimal performance and safety in your electrical systems. Invest in the Digital Current Transformer Test Set to enhance your testing capabilities and uphold the highest standards of electrical integrity.

Leveraging on our skilled and qualified professionals, we are actively involved in offering a trendy range of Transformers Differential Protection UNIT to our valuable customers at pocket-friendly prices.

Technical Specification:
 Input Supply : 3-phase, 415V, 50Hz, AC supply.
 Control Supply : 1-phase, 230V, 50Hz, AC supply.
 Short Circuit Protection : HRC Fuses & MCB.
 Supply Frequency : 50 Hz.
 Transformer specifications : 3-Phase, 3KVA, 415/240V, delta/star connected transformer with tapings Primary : 0-10-20-100% Secondary - 0-10-20-100% on each phase of windings, Natural air cooled.
 Protection CT''s : Primary side CT''s 10/1A, 5 VA, cl-1, wound primary typeSecondary side CT''s 20/0.67A, 5VA, wound primary type.
 Fault Simulating Switches : 32A, 2-pole, On/Off rotary switches are provided for creating a) Line to Ground fault, b) Line to Line fault, c) Inter-turn faultProtective Relays
 % Differential Relay Static Type-with Minimum basic setting Biased feature 10%, 20%, 30%, 40%, 50% setting for Current. CT rated 1A
 Definite time Over Current Relay
 Earth fault Relay
 Aux. Supply to Relay : 110/220 V AC/DC Educational Bench Model with Schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to terminals, circuit setup for testing through interconnections of Patch chords.

Being a trustworthy name in the industry, we are able to offer a superior quality array of Transmission Line Training System to our patrons.

Objective: * To study Short, Medium, Long Transmission Line* Determine the ABCD, H, Z and Image parameters of Short Transmission Line* Determine the ABCD, H, Z and Image parameters of Medium Transmission Line For T network For  network * Determine the ABCD, H, Z and Image parameters for Long Transmission Line* Measure the receiving end voltage of each line under no load or lightly load condition to understand Ferranti effect* Understand the performance of transmission line under different loads Technical Specifications:  Mains Supply : 230V 10%, 50Hz Single Phase Variac Input : 230V, ,  Display Measurement Voltage :25V, Current :0.2A Active Power :20W [2000W Reactive Power :20VAR [200VAR Apparent Power :20VA [2000VA / 100W, Inductor : 800mH/ 0. 5A, 450V Standard Accessories:Complete illustrated manual covering brief theory of equipment Setup Consisting of technical details and experimental procedures, Connection diagrams will be supplied with above experimental set up.Patch Chords.

Our presented series of Over Current & Earth Fault Relay Testing Kit (Numerical Type is enormously demanded in the market for their long-lasting nature and superior finish.

Objective:
 For Studying the functional performance of 3 OC/1EF Three Phase Relay
 For Graphical Plotting DMT Characteristics of the Relay
Technical Specification:- Part A.
RELAY: Over Current (Non-directional)MAKE: ALSTOM/L&T/ABBCURRENT
RATING CT Secondary : 1 or 5AmpsAUXILIARY VOLTAGE : 220/110/48/24Volts AC/DC
Part B. RELAY TESTING KIT : "KRB" MakeSpecification: Secondary Current Injection type Power input 220Volts AC 50Hz Built in digital timer 199.9 seconds for measurement of trip time  Stop /Start timer Digital Trip Status Indicator/Buzzer Power ON/OFF through MCB, Power on indicator Variable Current injection power circui Built in circuit breaker manual ON/OFF & Auto control Auxiliary Power for Relay 220 /110 /48 /24 Volts AC/DC Built in digital Ammeter Educational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30 terminals, circuit setup for testing through in reconnections of patch cards.

Technical Specification:
 Input Supply : 3-phase, 415V, 50Hz, AC supply.
 Control Supply : 1-phase, 230V, 50Hz, AC supply
 Short Circuit Protection : HRC Fuses & MCB.
 Supply Frequency : 50 Hz.
 GENERATOR specifications : Generator 3-Phase, 2KVA, 415/240V,And Primover Motor 3HP 220V 12 A DC Shunt Motor.Natural air cooled.
 Protection CT''''s : Primary side CT''''s 10/1A, 5 VA, cl-1, wound primary typeSecondary side CT''''s 20/0.67A, 5VA, wound primary type.
 Fault Simulating Switches : 32A, 2-pole, On/Off rotary switches are provided for creating a) Line to Ground fault, b) Line to Line fault, c) Inter-turn faultProtective Relays
 % Differential Relay Static Type-with Minimum basic setting Biased feature 10%, 20%, 30%, 40%, 50% setting for Current. CT rated 1A
 Definite time Over Current Relay
 Earth fault Relay
 Aux. Supply to Relay : 110/220 V AC/DC Educational Bench Model with Schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to terminals, circuit setup for testing through interconnections of Patch chords.

SpecificationsTHREE PHASE FAULT SIMULATING TRANSFORMERS 
One Number of Three phase, 3KVA, 415/415, Open type star-star transformer provided 

SpecificationsThree phase AC Motor set up: 
1. Motor spec: 3HP 
2. 3Ph.ac induction motor 
3. 15 V ac three phase. Star connected 
4. 1440rpm 

SpecificationsList of Experiments:
1 Study of Radial feeder
2 Study of Time Grading
3 Study of Current Grading
4 Study of Time and Current

 

 

SPECIFICATIONS

 

Experience enhanced safety and convenience with our Time Delay Switch featuring MCB protections. This innovative device ensures that your electrical systems are safeguarded against overloads and short circuits while providing a customizable time delay for optimal operation. Ideal for both residential and commercial applications, it allows for seamless control of lighting and appliances, reducing energy consumption and extending the lifespan of your devices. Invest in peace of mind and efficiency with this essential addition to your electrical setup.

Hopkinson's Test On A Pair Of Dc Shunt Machine

Objective:* For Studying Functional Performance Of IDMT Over Current Relay* For Graphical Plotting IDMT Characteristics Of The RelayTechnical Specification:-                                                                                       Part A. RELAY: Over Current  (Non-directional)MAKE:  ALSTOM/AREVACURRENT RATING CT Secondary :  1 or 5 AmpsAUXILIARY VOLTAGE  : 220/110/48/24Volts AC/DCPart B. RELAY TESTING KIT : "KRB"  MakeFeatures: Secondary Current Injection typ Power input 220Volts AC 50HzBuilt in digital timer 199.9 seconds for measurement of trip time  Stop /Start timer Digital Trip Status Indicator/Buzzer Power ON/OFF through MCB, Power on indicator Variable Current injection power circuit Built in circuit breaker manual ON/OFF & Auto control Auxiliary Power for Relay 220 /110  /48 /24 Volts AC/DC Built in digital Ammeter                                                                                                        Educational Bench Model with schematic diagram of the test circuit printed on the model Test points & measurement points brought out & connected to BTI 15/30    terminals, circuit setup for testing through in reconnections of patch cards.