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INSTALLATION, OPERATION AND MAINTENANCE GUIDE
GAS SAMPLING DEVICE
STORAGE AND SHELF LIFE
Handle with care. Max storage period before putting the instrument into service is 5 years
(temperature -20 +40 °C – air humidity 50-75%) as long as the instrument is kept in its envelope
and in a clean place. Before use it is recommended to visual check that no damages happened to
any parts.
UNPACKING
Make a correct disposal of packaging according local regulations.
MOUNTING POSITION AND CONNECTIONS
The gas sampling device RG3.3 for gas actuated Buchholz relays shall be fitted on the transformer
tank at ground level and within handy reach so that sampling, draining and testing operations can
be done ensuring workers' safety and without needing to shut transformer down as per EN
standard provisions.
A copper tube size OD 8 mm / ID 6 mm (supplied upon request) shall be used to connect the "RG3"
device from the cock "12" to the top of the Buchholz relay (cock R) and from the cock "15" to the
drain cock (pos.T) located at the bottom of relay body. Special ermeto joints "14" are provided with
each device (q.ty: 4/EA).
SETTING TO WORK
To fill up the RG3.3 device with oil open first the cocks "R" and "12". Now open cock "2" until oil has
entirely filled up the device and then close it when filling up is completed; you can check oil level
rising up inside the device through the inspection sight window located on the front side of the
same.
After the gas sampling device RG3 has been oil filled the cock "R" top of the relay and "T" at the
bottom of the body must be left in open position.
During the normal operation condition the gas sampling device, the Buchholz relay and the tubes
which connect the two devices shall be oil filled.
OPERATING THE DEVICE
The RG3 device allows to perform three different functions:
-Sampling the gas off Buchholz relay and release the gas off system
-Test the circuits of Buchholz relay
-Draining oil off Buchholz relay
rev.1
RG3.3
(FOR RELAYS EE2 / EE3)
DATE: 30/01/15
Pag. 1 of 2
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Summary of Contents for Cedaspe RG3.3
- Page 1 SETTING TO WORK To fill up the RG3.3 device with oil open first the cocks "R" and "12". Now open cock "2" until oil has entirely filled up the device and then close it when filling up is completed; you can check oil level rising up inside the device through the inspection sight window located on the front side of the same.
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Page 2: Maintenance
Gas sampling off Buchholz relay 1. Open cock “11” located underneath the RG3 to drain oil and await until the gas collected in the relay fills the device (you can observe this through the window). 2. Close the cocks “11” and “12” when the amount of gas needed for sampling is inside the RG3. -
Page 4: Content Of The Packaging
Instruction booklet for the use of Buchholz relays testing device. Fig.1 CONTENT OF THE PACKAGING no.1 relay testing device no.2 16 g CO cartridges DESCRIPTION (Fig. 1) 1. valve body (where to insert cartridges) 2. output cock 3. cartridge insertion 4. - Page 5 Fig.2 d) Make sure that vent cock on relay (fig. 3) is closed (black cock handle in horizontal position) before removing the protective plug e) Unscrew the protective plug of the vent cock and screw joint 6 on the same (fig.3) Fig.3 Nome file: buchholz relay testing device REV.
- Page 6 f) Open vent cock (black handle in vertical position) g) Hold the testing device by avoiding to touch cartridge 4 with hands (use a glove or a cloth) Since the testing device is under pressure the sudden exit of CO from the cartridge (gas expansion stage) make cool the metal outside surface of the cartridge.
- Page 7 REMOVAL OF TESTING DEVICE A) Close the vent cock (black cock handle on horizontal position) on which the device is connected (this will prevent oil leakage when joint 6 will be removed) B) Unscrew joint 6 from the vent cock C) Screw the protective plug (the one on the lower part of the relay) if it has previously been used D) Carefully open the upper vent cock to allow the exit of the gas inside the relay ;...