Connection Instructions for High Voltage Switch Mechanical Characteristics Tester

The high-voltage switch mechanical property tester uses a grating displacement sensor (grating ruler) as an intelligent comprehensive test method for displacement sensors. With the continuous advancement of computer technology and sensor technology, circuit breaker mechanical property test equipment has gradually developed into an intelligent, digital, and graphical comprehensive test tool, and at this time, most sensors also use grating rulers. Grating rulers generally use a grating engraved on a certain carrier (such as glass, crystalline ceramics or steel strips, etc.) as a measurement reference. Its working principle is to use a photocell scanning method that senses changes in light intensity for measurement. Grating rulers have strong anti-interference and high sensitivity, but they are easily damaged during testing or storage. Many users gradually switch to linear or angle sensors.

Connection of the measuring line of the high voltage switch mechanical characteristics tester:

1. Notes

The instrument must be connected with the power switch turned off when connecting, removing the broken measuring line or replacing the displacement sensor, and the connection must be made with the power turned off.

The high-voltage switch mechanical characteristics tester is equipped with six break input terminals. The instrument is programmed to calculate the stroke, overstroke and closing (opening) speed with the sampling data of break A. When connecting the break wire, the break wire of the phase where the sensor is installed must be connected to the A terminal of the instrument (for example: if the sensor is installed on the B phase of the high-voltage circuit breaker, the break wire of the B phase should be connected to the A terminal of the instrument. At this time, the measured A break data is actually the data of the B phase break), otherwise the stroke, overstroke and speed data measured by the instrument will be incorrect. In use, the displacement sensor can be installed on which phase of the high-voltage circuit breaker according to user requirements.

2. Connection of the break line

⑴ Measure the wiring method of vacuum, sulfur hexafluoride, and low-oil three-phase three-break high-voltage circuit breakers.

When testing a three-phase high-voltage circuit breaker with only three breaks, first connect the three-phase breaks of the high-voltage circuit breaker A, B, and C to the red wires of the instrument A, B, and C (select the corresponding type of displacement sensor for installation). The remaining corresponding measurement line is connected to the black wire plug at the corresponding end on the instrument panel.

⑵ Measure the wiring method of low-oil and high-oil six-break high-voltage circuit breakers.

When testing a three-phase six-break high-voltage circuit breaker, a nine-wire connection method is used. For example, for a low-oil SW6-110 circuit breaker, connect the A-phase break 1 and break 2 wires to the A and A1 sockets on the instrument panel respectively. At this time, the corresponding displacement sensor should be installed at break 1 of the high-voltage circuit breaker, and the common end of the A-phase moving contact should be connected to the common black socket on the instrument panel. According to this method, connect phases B and C. At this time, the three-phase out-of-phase time displayed by the instrument is the phase difference time of the six breaks, and the same-phase out-of-phase time is the phase difference time of three groups of breaks, namely A and A1, B and B1, and C and C1. ⑶ Measure the wiring method of a low-oil twelve-break high-voltage circuit breaker.

When testing the low-oil SW6-220 high-voltage circuit breaker, firstly, the phase measurement should be carried out, and the soft connection between the two high-voltage circuit breakers on one phase should be disconnected. The connection method of the two high-voltage circuit breakers should refer to the connection method of the low-oil SW6-110 high-voltage circuit breaker in Article ⑵. The C and C1 inlets of the high-voltage switch comprehensive tester are not connected to the input line. At this time, the three-phase out-of-phase time measured and displayed by the instrument is the phase difference time between the fastest and slowest two breaks in the group of four breaks, and the same-phase out-of-phase time displayed is the phase difference time between breaks A and A1, and B and B1 respectively.

After each phase of high-voltage circuit breaker is debugged and measured to be qualified, the three-phase different phase test is carried out. When measuring the three-phase different phases of twelve breaks, it is necessary to connect the soft connections of two high-voltage circuit breakers in each phase, and use the soft connection in the three-phase high-voltage circuit breaker as the common end of each phase, connected to the common black socket of the instrument panel, and then connect the incoming and outgoing terminals of each phase of the high-voltage circuit breaker to the A, A1, B, B1, C, C1 sockets of the instrument respectively, that is, connect the twelve breaks of the switch into six series breaks for testing. The measurement results after connection in this way are exactly the same as the measurement results of the twelve breaks connected separately. At this time, the in-phase and out-of-phase time of ports A and A1, B and B1, and C and C1 displayed on the instrument are the phase difference time of each of the three groups of series breaks, and the three-phase out-of-phase time is the phase difference time of the six series breaks in the three phases, that is, it is also the phase difference time between the fastest and slowest breaks among the twelve breaks in the three phases (Note: when measuring the three-phase out-of-phase, the pressure of the three-phase operating mechanism should be kept the same).

3. Connection of closing (opening) signal line

When connecting the closing and opening signal wires, the power supply of the original control part of the high-voltage circuit breaker should be cut off first, and the connection wire of the closing (opening) signal wiring socket of the instrument should be directly connected to the corresponding control circuit of the high-voltage circuit breaker. When doing the closing operation, it must be connected to the closing control circuit, that is, the closing control point and the common ground on the terminal block. When doing the opening operation, connect the opening control point and the common ground on the terminal block, and operate the high-voltage circuit breaker through the auxiliary switch.