1
I.Overview
Reactive power compensation capacitor is an important equipment to satisfy the reactive
power balance of the power system. In recent years, the problem of reactive power has
received general attention from the electrical industry, and a large number of reactive
power compensation devices have been put into operation in the distribution network.
Power supply requires real-time balance of active and reactive power in the system.
Therefore, the reactive power compensation device should meet the requirements of
automatic tracking and real-time compensation, which inevitably requires frequent
switching and switching of reactive power compensation capacitor banks. The switching
operation of the capacitor bank will produce overcurrent and overvoltage shocks, which
will cause damage to the capacitor. In order to ensure the reliability of the equipment,
early detection of capacitor defects and avoid the expansion of faults, regular inspections
are required. In the field, capacitors are all connected in groups in parallel. The traditional
method is to remove the capacitor bus and then measure with an old-fashioned capacitor
meter. Since the capacitor bank is composed of dozens to hundreds of small capacitors, it
is necessary to disconnect the wires to measure the capacitance. The amount is large,
and frequent removal of the wires will cause the screws to slip or not tighten, leaving a
safety hazard, and it is also easy to cause secondary damage to the capacitor. Therefore,
it is very desirable to have a test instrument that can measure the capacitance of each
small capacitor without removing the wires, reduce the burden on maintenance personnel,
improve the efficiency of maintenance work, and improve the safety of the distribution
network operation.
In view of the actual situation on the spot, our company finally developed this kind of
instrument that uses the new test method to measure. The instrument can measure the
individual capacitors of a group of parallel capacitors without disconnecting the wires,
using advanced measurement principles and four-terminal measurement technology,
which can accurately measure and have good test repeatability; in line with SJ-255-10300
capacitance measuring instrument National standard. At the same time, it can also
measure the inductance of various reactors. The instrument has convenient wiring and
