UNI-T UT276A - Application of the Gas Station Ground System

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4 Application of the gas station ground system
Under the explosive gas atmosphere, equipment or infrastructure such as gas
station, oil field, oil chute etc. shall be equipped with the explosion prevention
product.
In accordance with the JJF2-2003 Test Code for Static Protective Ground Device,
gas stations shall measure ground resistance and connection resistance of the
following infrastructure. The equipment used in measurement shall comply with
the requirements in GB3836-2000 Electrical Apparatus for Explosive Gas
Atmospheres.
No.
Measurement items
Technical requirements
Oil tank ground resistance
Loading point ground resistance
Oil-filling machine ground resistance
Ground resistance of the oil-filling
machine oil hose
B-clamp meter have gained the explosion prevention accreditation with the
explosion-proof mark being Exia BT3. The clamp can apply to the flammable
and explosive atmosphere.
(1) Oil tank and loading point ground resistance measurement
Auxiliary polarityB
Test line
Oil tank polarity A
Loading point polarity C
As shown in the above picture, in the gas station ground system, oil tank ground
polarity A is connected with oil-filling and the loading point ground polarity C is an
independent ground polarity . Find another independent ground polarity as
auxiliary ground polarity B ex. running water pipe , measure R1 R2 and R3 in
accordance with the three-point method by clamp meter .
UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL