SVERKER 750/780
Relay Test Sets
Testing the pick-up and drop-out using SVERKER 780
Other fields of application
▪
Plotting excitation curves
▪
Current and voltage transformer ratio tests
▪
Burden measurement for protective relay test equipment
▪
Impedance measurement
▪
Efficiency tests
▪
Polarity (direction) tests
▪
Injection
▶
Maintained
▪
»
Injection continues without any time limitation.
▶
Momentary
▪
»
Injection continues only as long as the button is kept
depressed.
▶
Max. time
▪
»
Injection stops automatically when the preset maximum
time is reached.
▪
Filtering
▶
When filtering is selected, five successive readings
are averaged. The following can be filtered: Current,
Voltage and Extra items that are measured.
▪
Off delay
▶
The turning off of generation can be delayed after
tripping throughout a specified time interval that is
expressed in mains frequency cycles.
Application example
IMPORTANT!
Read the User’s manual before using the instrument.
Testing the pick-up and drop-out using SVERKER 780
1.
Connect as shown in the diagram.
2.
Select stop conditions, dry or wet contact.
3.
Select HOLD to freeze the current reading.
4.
Press button SEL/ A until you get a red light at the
built-in ammeter.
Note
: Maximum allowed current through the
separate ammeter used in this connection example is
6 A. The other measurement points do not have this
limitation.
5.
Press the MODE button.
6.
Use the key
▼
to select
Ω
,
φ
, W, VA...
7.
Press CHG (Change)
8.
Select
φ
(
°
, Iref) or (
°
, Uref) by using the key
▼
.
9.
Press SEL (Select)
10.
Press ESC
11.
Set the voltage amplitude with the upper small
knob.
12.
Make sure the main knob is set to 0.
13.
Turn on the SVERKER output by activating ON using
the start switch
▼
.
14.
Set the phase-angle. Use the lower knob for fine
adjustment, and the middle knob for step of 90°.
Note:
A small current flowing in the circuit is
required to measure the phase angle.
Testing the operation time
15.
Increase the current to 1.5 times the pick-up value.
16.
Invoke the ON+TIME state by means of the start
switch. The outputs will now remain turned on until
the protective relay equipment operates.
17.
Read the time from the display. Check also the high
current setting using the same procedure.
