Geochain Power Panel (GPP-1)

The digital GeochainTM product ranges are all supplied operating current at surface via a Geochain Power Panel (GPP).  GPP features a Wireline Interface Box (WIB), which enables both DC power and AC data to be transmitted over the same wireline cable.

The GPP has inbuilt safety features to maximise user protection during Geochain operation.


Main Features
  • Enables DC Power and AC data transmission over same wireline
  • Operates from all standard mains power supply
  • Interface directly with GSP-1
  • Operates with all digital GeochainSlim/EHP systems.
  • In built safety protection
GPP Functionality

The GPP (Geochain Power Panel) is designed to supply operating current to the Geochain borehole seismic tool.

The GPP contains a ruggedised Glassmann LVP600-1.7 power supply (a rebadged Xantrex manufactured unit) and is packaged into a nineteen-inch rack-mountable case, along with our own GPP filter and GPP supervisor boards.

The GPP unit also incorporates the WIB (Wireline Interface Box). The WIB contains transformers to enable both DC power and AC data to be transmitted over the same wireline cable. Note that the early GPPs do not have an integrated WIB, but instead may connect to a separate WIB via a short interface cable.

GPP supervisor board

The functions of the GPP supervisor board are, in order of priority:

  1. To minimise the risk of harm to personnel.
  2. To minimise the risk of damage to incorrectly connected equipment.
  3. To enable the Geochain tool system to be reset under program control.
  4. To enable automated logging of Geochain operating current and voltage.

At switch on, the GPP supervisor board performs a short series of electrical tests, using safe voltage levels, to check for the presence of a Geochain VRS (Voltage Regulator Section). If a VRS is not detected, then the GPP output is inhibited and the appropriate fault is signalled by front panel status indicators.

During operation, the GPP supervisor board continuously monitors output voltage and current. In the event of a sudden change in either parameter, the GPP output is again inhibited and the appropriate fault signaled.

GPP-1 Specifications  
Output Voltage: 0 – 600 Vdc
Output Current: 0 – 1.7 A
Output Power: 1020 W
Rated AC Input Voltage: 100/120/200/220/230/240 Vac (nominal)
  Derate maximum output power to 900 W for AC input less than 95 V.
Maximum Input Power: 1250 VA
Maximum Input Current: 13 A maximum at 100 Vac
  11 A maximum at 120 Vac
  6 A maximum at 220 Vac
Input Frequency Range: 47-63 Hz
Power Factor: 0.99 minimum for full load and 120 Vac input
Input Harmonic Distortion: EN61000-3-2 compliant
Switching Frequency: 62.5 KHz nominal (125 KHz output ripple)
Isolation Voltage: Input to output: 1350 Vac
Efficiency: 85%, full power at 115 Vac input
Operating Temp Range: 0 to 40 degrees Centigrade
Storage Temperature Range: -40 to 60 degrees Centigrade
Humidity Range: 10% to 80% RH, non-condensing
Format: 19” rack mountable case
Width: 450 mm (480mm inc. ears)
Height: 4U (180 mm)
Depth: 385 mm behind mount ears plus 45 mm in front of ears
Weight: 11.5 Kg
AC Input Connector Type: IEC320
Fuses: 20 A, 250 V, 5 x 20 mm slow
Cooling: Fan cooled. Air exhausts at right hand side, front and rear. Over-temperature shutdown