Related Manuals for geotomographie SBS42
Summary of Contents for geotomographie SBS42
- Page 1 Manual P-wave sparker SBS42 S-wave source BIS-SH info@geotomographie.de Tel.: +49 2631 778135...
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Page 2: Table Of Contents
2.1.1 Generator control 2.1.2 Impulse control 2.1.3 Trigger Downhole equipment P-Wave probe SBS42 S-Wave probe BIS-SH Operation and Maintenance Instructions Impulse generator and remote control unit 4.1.1 Preliminary works 4.1.2 . Impulse operation control (EXTERN) - controlled by remote unit 4.1.3... - Page 3 Precautions Operation of high voltage equipment type SBS42 and BIS-SH Like other seismic sources as explosives, air guns or weight dropping systems, operating of an electrical spark or other high-voltage impulse sources requires several precautions. The most important precautions are: Impulse generator operation only by authorised personnel.
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Page 4: Impulse Generator
Impulse generator The impulse generator IPG5000 is the high voltage power supply to the seismic sparker probe SBS42 or BIS-SH. Figure 1 shows the impulse generator and its remote control RCU. Fig. 1: Impulse generator IPG and remote control unit RCU. -
Page 5: Connections At Ipg5000 And Set-Up
VAC. NEVER disconnect while under operation or while the unit is charged. Next, the borehole probe SBS42 or BIS-SH can be connected to the IPG5000 through the big red HV cable (see chapter 5.3/5.4). - Page 6 Fig. 2: Cable connections at IPG5000 Fig. 3: Details of connecting points at IPG5000 rear side Fig. 4: Rubber fixation of HV connector at IPG5000...
- Page 7 Fig. 5: Control panel at IPG5000 At the front panel of the IPG5000 several control and push buttons are available (see Fig. 5). Voltmeter Key switch (0=OFF, 1=ON) Fuses (from left to right with 0.8 A, 4 A, 4 A) EMERGENCY OFF Voltage (230V) switch ON High-Voltage switch ON...
- Page 8 Fuse for Control 2 x Fuses for H Part FUSES M0,8/250C T4/250E T4/250E (0,8A medium slow) (4A slow) (4A slow) IMPULSE GENERATOR SINGLE- CONTI INTERN EXTERN IMPULSE 4-7 sec HV-ON Fig. 6: Schematic diagram of the control panel at IPG5000 If all connections to IPG5000 are made, the remote control unit is connected AND the source is connected and inside borehole one can start the high voltage charging.
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Page 9: Remote Control Unit
Remote control unit The remote control unit fulfils following functions: Switch ON the IPG5000 Emergency OFF for interrupting any operation Shot release in SINGLE or CONTINUOUS mode Impulse counting of released shots Trigger signal output to seismograph The remote control unit is connected to the IPG5000 by one cable. All electronic circuits of the remote control unit (except the trigger circuit) are supplied by 24 V delivered by the impulse generator via the cable. -
Page 10: Function And Operating Of Remote Control
Fig. 9: Rear side of RCU with banana trigger and connector to IPG5000 2.1 Function and operation of the remote control unit To use remote control mode, the switch at the IPG5000 has to be set to position EXTERN. Remote Control is sub-divided into three panels. 2.1.1 Generator control (left panel at remote unit) The key switch at the remote control unit must be set to “1”... -
Page 11: Trigger
Trigger polarity (TTL Active Low = right switch position, TTL Active High = left switch position) Downhole equipment The IPG5000 outputs its energy to the borehole sources SBS42 or BIS-SH. The borehole source SBS42 generates compressional waves (P) in water filled boreholes. Energy released by the IPG5000 discharges through a coaxial cable terminated by two adjacent spark electrodes placed in a water filled chamber. -
Page 12: P-Wave Probe Sbs42
P-Wave probe SBS42 (sparker) The downhole sparker probe SBS42 consists of the probe head, an exchangeable spark electrode and the housing (see Fig. 10). Housing Probe Head Bottom Screw Spark Electrode Fig. 10: SBS42 downhole probe The probe head connects the probe electrically with the coaxial HV cable. The exchangeable electrode is a high duty long life spark electrode made of stainless steel and a tungsten-copper alloy inner electrode. -
Page 13: S-Wave Probe Bis-Sh
extension. For this reason the minimum operation depth should be no less than about one meter below water table. The rubber tube section can be dismantled for repair or maintenance works, e.g. of the spark electrode. S-Wave probe BIS-SH The BIS probe consists of the probe head, two half sleeves, the rubber protected and sealed active probe part, an air packer and the lower probe part (see Fig. - Page 14 Fig. 12: Half-Sleeves with HV cable and pressure hose connector The probe active probe part (shooting direction) needs to be aligned to the rotary string marking (see Fig. 13). Fig. 13: Rotary string alignment (points towards shooting direction) Fig. 14: Rotary string depth markers...
- Page 15 The air clamping part can easily be removed by unscrewing from the active part. Fig. 15: Unscrew to replace air bladder The BIS-SH probe can work in water filled and dry boreholes. Anyhow, while working in dry holes inner temperature of the coil system raises fast up (to 100°C).
- Page 16 The description of Fig 16 is as follows: Splitter Push-Pull connection at valve-gauge adapter Pressure gauge Valve Connector to air pump A special adapter with gauge and valve can be connected to the air-in connector. It’s a push-pull connection at the gauge-valve adapter. An air pump is provided to inflate the packer for clamping the source to the borehole wall.
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Page 17: Operation And Maintenance Instructions
Operation and maintenance instructions Impulse generator and remote control unit (surface equipment) 4.1.1 Preliminary works Plant earth hook to ground. In case of dry soil pour some water around the spike to improve conductivity. Connect earth hook with green/yellow cable to impulse generators ground (rear side). -
Page 18: Impulse Operation Control (Extern) - Controlled By Remote Unit
4.1.2 Impulse operation control (EXTERN) - controlled by remote unit • Key switch at remote control unit to “1” and emergency button is UP • Set toggle switch at remote control unit to SINGLE • Switch trigger on at remote control unit and set trigger type (low, high) •... -
Page 19: Impulse Operation Control Intern
4.1.3 Impulse operation control INTERN When using the generator without operation from remote control, following steps have to be carried out: Follow steps described under 4.1.1 Connect blind plug to IPG800 instead of remote control cable Trigger signal can be obtained from BNC connector located at rear side of IPG5000 (available since June 2016) Shot sequence timer at impulse generator for select shot cycle rate fully left! Switch toggle switch at impulse generator to INTERN (... -
Page 20: Sbs42Probe
SBS42 probe (sparker) Before starting any maintenance work make sure the probe is disconnected from IPG5000. In case of a damaged housing rubber tube, the electrode sparker function is not disturbed under normal conductivity conditions of the borehole fluid (water). -
Page 21: Clamping Pressure For Bis-Sh Probe
4.3.1 Clamping pressure for BIS-SH probe The BIS-SH source needs proper clamping to generate good quality shear waves. Please follow suggested procedure: Put the source in the boreholes only say half a meter and fix at surface. Pump air to the source and stop if the bladder reaches the casing. Check that pressure (A). - Page 22 Strike Direction Magnetic North Strike Direction Line Direction Receiver borehole Source borehole Fig. 17: Orienting the BIS-SH Once the rotary pipe string is rotated clamp the string using a work bench (see Fig 18). Fig. 18: Fixation of the BIS-SH using the work bench...
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Page 23: Surface Cable And Quick Connector
Surface cable and quick connector Keep connectors away from dust, moisture and water. Do not bend the cable in strong manner. Insert plastic seal plug into the quick connector after disconnection. -
Page 24: Trouble Shooting
Use a small screw driver and turn to more sensitive level (see fig 8.). Adjust the level while shooting with the SBS42 or BIS-SH. If LED flashes red but no trigger is received by seismograph check the trigger cable connecting seismograph and remote control unit (cable might be broken). -
Page 25: Sbs42 Test Arrangement
Please be careful and stay away while the system is operating. Do not perform the test indoor as the bucket might break and water will flow out. You can remove the housing from the SBS42 probe. Be careful do not touch un- isolated parts. -
Page 26: Tomography Arrangement
5.3. Tomography arrangement Crosshole arrangement... -
Page 27: General Checks
1. Measure ontinutity between each +/- pole Sparker Elektrode 2. Cross-check with the other pole uick c onnector to Electrode 1. Measure ontinutity between each +/- pole Quick connector plug 2. Cross-check with the other pole Fig. 19: Check continuity for SBS42... - Page 28 3. Still NO, disconnect remote control cable from IPG5000 and connect blind plug. Try again. Case 2: IPG5000 does not discharge This is a typical case if no spark can happen (for SBS42) because there is a too high resistance. Check if all connections are established and OK ...
- Page 29 Checking the sparker electrode The sparker electrode undergoes abrasion on continuous use. The left picture below shows a sparker electrode after about 2000 shots. It is still working but it will show further wear if the electrode is not flattened at the end of the day. To flatten the electrode use a file or a saw.
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