Characteristic Test - Mitsubishi Electric CBV2-A01D1 Instruction Manual

8.2 Characteristic test

8.2.1 Precautions in testing
(1) Standard test conditions
Ensure the following test conditions whenever possible:
Note that carrying out a test under an environment that significantly differs from the following
conditions may produce an incorrect result.
Ambient temperature : 20°C±10°C
-
Rated frequency
-
Waveform (AC)
-
Auxiliary power supply voltage : rated voltage ±2%
-
(2) Characteristic control point
See the section 3 "Characteristics".
The characteristic control point refers to the characteristic of a relay unit only. Note that, when a
characteristic test is carried out on a relay system connected with external equipment such as CT
and ZCT, the result obtained would be a combined characteristic added with the fluctuation of the
external equipment.
For special control in terms of a specific control point (for instance, using the operation setting), first
carry out a test at "Characteristic control point" at the time when the relay is received or put in service
to determine the acceptance/rejection. Thereafter, perform another test at each control point, so that
the data obtained can be used for future reference.
(3) Changing setting
Change the setting according to the section 6 "Handling".
(4) Operation judgment
Determine the operation currents and time and other values of the relay unit basically by turning on
and off the corresponding output relay contact of each element.
To determine the starting value of the time-delayed elements of overcurrent relay, which cannot be
checked through the output contact, read the display of "elapsed time of time-delayed timer".
(5) Communication card
Whatever the communication card is inside or not, for the test of withstand voltage and lightning
impulse withstand voltage, please avoid inputting test voltage to the serial communication network
circuit (DA, DB, DG, SLD terminals).
Note: it is not necessary to take the communication card out when test if the communication card was
inside unit.
: ± 5%
: 2% (distortion ratio)
37 PCKN-OIL738