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TF Joint Voltage Drop Instrumentation

TF Joint Voltage Drop Instrumentation. Robert Marsala (609) 243-2507 Hans Schneider (609) 243-2017 Engineering Operations August 7, 2003. TF_JOINT_Final_Design_Review.ppt. Voltage Drop Measurement Plan. Instrumentation Must be Capable of the Following Maintenance Testing

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TF Joint Voltage Drop Instrumentation

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  1. TF Joint Voltage DropInstrumentation Robert Marsala (609) 243-2507 Hans Schneider (609) 243-2017 Engineering Operations August 7, 2003 TF_JOINT_Final_Design_Review.ppt

  2. Voltage Drop Measurement Plan • Instrumentation Must be Capable of the Following • Maintenance Testing • Inject up to +/-220A into TF Coil and Measure the Voltage Drop at Every Joint • Operational Testing • Measure the Voltage Drop at Every TF Joint During an Actual Shot at Up to 72KA • Common • Computation of Resistance, Trending, Alarms, Warnings Bob Marsala, Hans Schneider Engineering Operations

  3. Voltage Drop System Block Diagram Two Twisted Pair Per Flag R=V/I (at 72kA or 200A) Trending, Alarms, and Warnings EPICS x 72 CAMAC CRATE 96 Channels ADC TF Power Supply Halmar Current Gain 72kA or 200A Mother Board Shunt Voltage TF BUS Transorbs 450J 50kA 340V 200A 1 Ohm 275W #24AWG Two Twisted Pair Teflon (1500V Between Conductors) Tefzel Outer Insulation (Spark Test to 10kV) Manual Control 1N4047 275A 200V Disconnect Switch Shunt 40mV @ 200A Agilent 6671A 220A @ 8V Polarity Switching Relay Bob Marsala, Hans Schneider Engineering Operations

  4. TF Joint Voltage Measurement Components • 2 Voltage Probes on Each TF Joint • Cables from all Probes (144) to Racks • Instrumentation Consisting of • Quick Disconnect Panel • Isolated Programmable Gain Amplifier • CAMAC Transient Digitizer • 200 A Source Hardware and Switch Bob Marsala, Hans Schneider Engineering Operations

  5. TF Flag Joint Voltage Probes Two Probes per Joint 144 Potential Data Points Two Coax Probes To Measure Voltage Drop Bob Marsala, Hans Schneider Engineering Operations

  6. Probe Detail Probe Terminated in a SMB Connector Near Flag Bob Marsala, Hans Schneider Engineering Operations

  7. Cable • Janor Wire & Cable Corp • 2 Twisted Pairs per Cable with Overall Jacket • One TP for Each of the Two Probes on a Joint • #24 Conductors • ETFE Insulation • 10KV Isolation from Conductor to Outer Jacket • Terminations • Flag End: SMB Mating Cable Spliced to Cable • Rack End: 4 Pin Locking Tripeg Molex Connector Bob Marsala, Hans Schneider Engineering Operations

  8. Programmable Gain Isolation Amplifier • Amplifies and Isolates Voltage Across Joint • 12 Boards per Mother Board, 6 Mother Boards = 72 Boards • 5000V Isolation between Input and Output • Two Gain Stages (Each having a Gain of 1, 10, 100 or 1k) followed by Unity Gain Isolation Amplifier • Overall Gain from 1 to 1 Million Controlled by Two Rotary Switches on Control Panel • Nominal Gain: 100 for 72kA, 10,000 or 100,000 for 200A • Anticipated Accuracy: about 10% of measured value • Due to Noise, Temperature Effects and Drifts Bob Marsala, Hans Schneider Engineering Operations

  9. Summary • 2 Voltage Probes on Each TF Joint • Cables from all Probes (144) to Instrumentation Racks • Quick Disconnects Provided to Open Probe to Amplifier Connections • Capable of 72kA Operation or 200A Maintenance Operation • One Probe from Each Joint is Monitored • Isolation to 5000V • CAMAC Data Acquisition • EPICS Used for Calculations, Trending, Alarms and Warnings • About 10% Anticipated Accuracy and Repeatability Bob Marsala, Hans Schneider Engineering Operations

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