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Relay test sets

SVERKER750/780

 
  • SVERKER750/780
  • Overview  
  • Application  
  • Downloads  
Overview
  • The engineer’s toolbox for all single phase relay testing!
  • Stand-alone functionality
  • Rugged and reliable for field use

The SVERKER750 and SVERKER780 Relay Test Set are the engineer's toolbox. The control panel features a logical layout, SVERKER 650 users will find it comfortably familiar and will be able to start work right away.

The SVERKER750 and SVERKER780 features many functions that make relay testing more efficient. For example, its powerful measurement section can display (in addition to time, voltage and current) Z, R, X, S, P, Q, phase angle and cos φ. The voltmeter can also be used as a 2nd ammeter (when testing differential relays for example). All values are presented on a single easy-to-read display.

You can also test directional protective equipment efficiantly by means of the built-in variable voltage source. In SVERKER780 this has a continuous phase shift function and adjustable frequency as well. Automatic reclosing devices can also be tested – just as easily.

Designed to comply with EU standards and other personal and operational safety standards, SVERKER750 and SVERKER780 are also equipped with a serial port for communication with personal computers and the PC software SVERKER Win.

Since the compact SVERKER weighs only 18 kg (39 lbs), it’s easy to move from site to site.

Two or more SVERKER units can also be synchronized, which allows the user to operate a basic 3-phase test set.

Application
Relay Testing SVERKER 750/780 is intended primarily for secondary testing of protective relay equipment. Virtually all types of single-phase protection can be tested. You can also test three-phase protection that can be tested one phase at a time, and also a number of protective relay systems that require phase shifting. Moreover, automatic reclosing devices can be tested. SVERKER 780 can test voltage relays with a frequency range from 15 Hz up tp 550 Hz. Examples of what SVERKER can test ANSI® No.
  • Overcurrent relays 50
  • Inverse time overcurrent relays 51
  • Undercurrent relays 37
  • Ground fault relays 50N, 51N
  • Directional overcurrent relays 67
  • Directional ground fault relays 67N
  • Overvoltage relays 59
  • Undervoltage relays 27
  • Directional power relays 32
  • Power factor relays 55
  • Differential protection (differential circuits) 87
  • Distance protection equipment (phase by phase) 21
  • Negative sequence overcurrent relays 46
  • Motor overload protection 51/66
  • Automatic reclosing devices 79
  • Tripping relays 94
  • Voltage regulating relays
  • Underimpedance relays 21
  • Thermal relays 49
  • Time-delay relays
  • Frequency relays (SVERKER 780) 81
  • 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 cycle
  • 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. Application example with PSS750 IMPORTANT! Read the User’s manual before using the instrument 1. Connect the current and voltage outputs of SVERKER 750/780 to the PSS750 inputs. 2. Connect the current and voltage inputs of the relay to the PSS750 outputs. 3. Select which phase to test and type of test (phase-to-ground or phase-phase) with the selector switch. 4. Proceed with the test for each phase and fault type. 5. To create a phase shift, connect the 10 µF capacitor in SVERKER 750/780 in series between the voltage output and the PSS750 input, and connect the variable resistor in parallel with the PSS750 input. 6. Set the SVERKER 750/780 for phase (and impedance) measurement. Connect the voltage measurement input to the PSS750 input. 7. Start the test with the resistor in maximum position. Gradually decreasing the resistor gives increasing phase shift in the voltage signal. The test voltage/impedance will decrease at the same time so an adjustment of the test current might be necessary to get the correct impedance. Please observe that the phase shift depends on the input resistance and may vary between different relays. Some relays may also have a low voltage limit where the relay will not operate. For additional 180 degrees phase shift use the phase reversal switch.
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