SCR Elektroniks have come up with an automatic bench that accommodates almost all of the electrical tests that have to be performed for both A type and AC type RCCBs.
1. Variable Current Source with 2 adjustable Resistance Banks: The resistance value of one bank will be adjusted to pass test current like I∆n, 2*I∆n, 5*I∆n (any value between 10mA and 1500mA).
2. Variable AC Voltage Source: Variable Current Source, low voltage, to get 500A.
3. Digital Time Interval Meter to measure trip time during speed of operation test: This will be auto range type to measure time from 1msec to 9999 Sec. The Start & Stop signals will be current sensing type.
4. Programmable Logic: This is used for selecting different Test, selecting the poles one by one, setting the test parameters. (Option is available for storing the data and downloading it to PC)
5. Digital mA meter to measure leakage current.
6. Digital Voltmeter to measure Test Voltage.
7. Switching Arrangement: To select different test circuits.
8. Thyristor Circuit: With variable firing angle (0, 90, 270-degree) arrangement.
9. Entire system is enclosed in aesthetic panel in aluminum sections.
PC Based option:
If opted for, we give a PC along with customized software allowing the user to interface the test bench through PC. Report generation and data keeping is possible too. The software will be NI LabVIEW based with very easy user interface.
Input: Default is 230 V AC +- 10 %; specify while ordering.
Leakage Current Ranges: 10mA, 30mA, 50mA, 100mA ,300mA & 500mA.
Between 10mA to 2500mA at 230V AC, Coarse with Switching and Fine with Toropot
500A at low voltage
delay angle adjustment of 0-degree, 90-degree, 135-degree.
Digital mAmps Meter, 3 ½ Digit, 2 ranges.
Transient Signal Recording Meter
Time Measurement: 5 Digit 0 to 99.999 Sec.
Protection: Through MCB.
To cater to a large variety of type tests, SCR Elektroniks have come up with an automatic bench that accommodates almost all of the electrical tests that have to be performed for both A type and AC type RCCBs. The entire test bench is controlled and managed from the PC thus making traditional inaccurate residual testing obsolete. The PC software selects the source and load parameters on itself and all the tests are carried out on one single RCCB one after another.
The test bench has an output terminal strip to source the desired leakage current to accommodate both 2 pole and 4 pole RCCBs with detailed marking on the front panel. Also included are separate set of terminals for voltage test (Clause 9.16). In addition, it has copper busbars for sourcing 500 A for short time (Clause 184.108.40.206).
The test bench has two modes: Manual mode and PC mode. In the manual mode, the user may carry out an individual test by adjusting the required parameter by a combination of selector switches. In the PC mode, the user conducts the test entirely with the help of PC software. In some tests where the IEC advises the user to, for instance; hold the RCCB dolly manually; the PC is programmed to run the test where the user simultaneously holds the dolly. Thus the entire test sequence (Test 1 to Test 9) is automatic unless the user quits the sequence.
In a nutshell, the PC controls the entire hardware of the system comprising of the logic and control circuit, variable current source, load bank, thyristor module and sources the test data from the measurement system. With the PC mode, the user is assured of an error free test sequence as well as results thus enabling a correct conformance certificate of the RCCB for testing as per IEC.
Reports are generated in a detailed manner by the PC software and the reports can be exported to some standard format. The software report is ideal for a commercial test LAB which issues a type test certificate to RCCB manufacturers.
The test bench is specifically designed to include the type tests concerning both A and AC type RCCBs.
The system consists of following IEC tests:
Module A: Test system for type tests to carry out the verification of operating characteristics as per IEC 61008–1 clauses 220.127.116.11, 18.104.22.168, 22.214.171.124, 9.15, 9.16 of RCBO / RCCB:
Module B: Test system for type tests to carry out the verification of correct operation at residual current with DC component as per IEC 61008 – 1, clauses 126.96.36.199, 188.8.131.52, 184.108.40.206 of RCBO / RCCB:
These two modules are incorporated in a single unit.
Description of Module A: Test system for type tests to carry out the verification of operating characteristics as per IEC 61008–1 clauses 220.127.116.11, 18.104.22.168, 22.214.171.124, 9.15, 9.16 of RCBO / RCCB:
Verification of the correct operation in case of a steady increase of the residual current as per IEC 61008-1 clause 126.96.36.199. The circuit is arranged as shown in figure 4a of IEC 61008-1. The residual current is steadily increased with the help of variable resistance and current is displayed on meter. The tripping current of the RCCB is noted.
Verification of the correct operation at closing on residual current as per IEC 61008-1 clause 188.8.131.52 (Commonly called as speed of operation test). The RCCB is closed with residual operating current set equal to I∆n, 2*I∆n & 5*I∆n in each pole one by one and the break time is measured (five times) and compared with the limiting value specified for corresponding I∆n in table 1 of IEC 61008-1.
Verification of the correct operation in case of sudden appearance of residual current as per IEC 61008-1 clause 184.108.40.206. With the RCCB in closed position, the residual current (which is pre-adjusted) is suddenly established, as specified in table 1 of IEC 61008-1, by a switch and break time is measured and compared with the corresponding limiting values as specified in the table.
Verification of the correct operation in case of sudden appearance of residual currents of values between 5*I∆n and 500A as per IEC 61008-1 clause 220.127.116.11. Test 2 & Test 3 are carried out with residual current of 500A at lower voltage and break time is compared with limit values specified in table 1 of IEC 61008-1.
Verification of the trip-free mechanism as per IEC 61008-1 clause 9.15. A residual current equal to 1.5*I∆n is passed with RCCB in closed position and operating means (popularly termed as dolly) being held in closed position. It is verified that the RCCB trips. This is repeated by moving the dolly slowly over a period of approximately 1s to a position where the current starts to flow. It is verified that tripping occurs without further movement of the dolly.
Verification of the operation of the test device at the limits of rated voltage as per IEC 61008-1 clause 9.16. The RCCB is supplied with a voltage equal to 0.85 times the rated voltage and the test device is momentarily actuated 25 times at 5s intervals, the RCCB being re-closed before each operation.
a) The above test is then repeated at 1.1 times the rated voltage.
b) The above test is then once repeated with the dolly held in the closed position for 30s.
Description of Module B: Test system for type tests to carry out the verification of correct operation at residual current with DC component as per IEC 61008 – 1, clauses 18.104.22.168, 22.214.171.124, 126.96.36.199 of RCBO / RCCB:
Verification of the correct operation in case of a continuous rise of the residual pulsating direct current as per IEC 61008-1 clause 188.8.131.52. This test is carried out with the current having delay angle a of 0-degree, 90-degree, 135-degree. The supply current is steadily increased and checked with limiting values as per table 17 of IEC 61008-1. The Verification at the reference temperature of the correct operation with load suggested in IEC 61008-1 clause 184.108.40.206 is possible with addition of special load and temperature oven.
Verification of the correct operation in case of suddenly appearing residual pulsating direct currents as per IEC 61008-1 clause 220.127.116.11. With the RCCB in closed position and the pulsating current already set to test value, circuit is established with external switch and the break time is measured and verified with limiting value as per table 1 of IEC 61008-1. This test is carried out with both the polarities.
Verification of the correct operation in case of residual pulsating direct currents superimposed by smooth direct current of 6mA as per IEC 61008-1 clause 18.104.22.168. The RCCB is subjected to half wave rectified residual current superimposed by smooth direct current of 6mA. The half wave current is steadily increased and checked that the RCCB of I∆n>10mA shall trip by current not exceeding 1.4I∆n + 6mA or for I<=10mA not exceeding 2 I∆n+6mA. The test is carried out for both the polarities.