4
1)
Select products of appropriate specifications according to the subjects
When in use, the capacitance of the test object shall not exceed the rated capacitance of the
instrument. If the capacitance of the test object is too small, the output waveform will be
affected. If it is less than 0.05 μ F, the instrument will not output normally. At this time, 0.05 μ f
capacitor (provided by the company) can be connected in parallel for auxiliary output. See
Table 4 and table 5 for the estimation of capacitance of common electrical equipment.
Table 4 single phase earth capacity of different types of generators.
Steam turbine generator
Hydro generator
Capacity
（
MW
）
200
300
600
85
125-
150
300
400
Single phase
ground
capacitance(uF
）
0.198
0.18-
0.26
0.31-
0.34
0.69
1.8-1.9 1.7-2.5
2.0-2.5
Table 5 capacitance of XLPE insulated single core power cable (μ f / km)
2)
Estimation method of test object current:
Calculation formula: I = 2 π FCU
IV. Product features
Advanced technology: digital frequency conversion technology, microcomputer control,
pressure rise, pressure reduction, measurement, protection, etc
The test process is fully automated.
Voltage(KV)
capacitance
(uf/Km)
Cross-
sectional
area
（
mm
）
16
25
35
50
70
95
120
150 185
240
10
0.15
0.
17
0.1
8
0.19 0.2
1
0.2
4
0.26
0.2
8
0.32 0.38
35
—
—
—
0.11 0.1
2
0.1
3
0.14
0.1
5
0.16 0.17
