Cable online short-circuit point test realization device
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A short-circuit point and cable technology, which is applied in the field of cable online short-circuit point test realization devices
Inactive Publication Date: 2016-08-03
HANGZHOU HOPECHART
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(1) Open circuit fault point
Method used
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example 1
[0019] Measuring principle:
[0020] Cable online short-circuit point tester adds high-voltage pulse voltage to the cable, superimposes OFDM, QAM, QPSK, ASK, PSK, FSK modulated frame signals on the high-voltage pulse voltage, and OFDM, QAM, QPSK, ASK, PSK, FSK modulated frame signals It is a data frame with a time stamp label. OFDM, QAM, QPSK, ASK, PSK, and FSK modulated frame signals are reflected at the short-circuit point, and the reflected OFDM, QAM, QPSK, ASK, PSK, and FSK modulated frame signals are short-circuited by the cable The point tester accepts and decodes the time stamp according to the received data frame, and measures the time for the time stamp to be transmitted back and forth according to the time difference between the current time and the time stamp, and calculates the distance between the short-circuit point and the test point according to the time.
[0021] Because the cable short circuit becomes a high-resistance state when a weak electric signal is loa...
example 2
[0032] In preferred example 1, OFDM is used for the modulation of the superimposed data frame, and QAM, QPSK, ASK, PSK, or FSK data modulation can also be used for the modulation of the data frame in this example.
[0033] like figure 2 As shown, 201 is a high-voltage direct current generation circuit, 202 is a QAM, QPSK, ASK, PSK, FSK data frame modulation circuit, 203 is a pulse and signal transmission control circuit, 204 is a cable connection interface, 205 is a distance measurement analysis circuit, and 206 is a display circuit;
[0034] The high-voltage direct current generation circuit (201) is connected as a pulse and signal transmission control circuit (203); the QAM, QPSK, ASK, PSK, FSK data frame modulation circuit (202) is connected to the pulse and signal transmission control circuit (203); the pulse and signal transmission The control circuit (203) is connected to the cable connection interface (204); the cable connection interface (204) is connected to the dis...
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Abstract
The invention relates to a device for realizing the on-line short-circuit point test of a cable. The device for realizing the on-line short-circuit point test of the cable is composed of a high-voltage direct current generation circuit, a pulse and signal transmission control circuit, a data frame modulation circuit, a distance measurement analysis circuit, and a display circuit; the pulse and signal The signal sent by the control circuit modulates the data frame modulated by the data frame modulation circuit to the high-voltage DC generation circuit through the coupling circuit, and directly loads it on the cable to be tested through the cable connection interface; the distance measurement analysis circuit connection cable connection interface will be superimposed on the high-voltage pulse The distance measurement analysis circuit analyzes the data frame signal, analyzes the time stamp, and calculates the distance of the short-circuit point of the cable; the distance measurement analysis circuit is connected to the display circuit, and displays the calculated distance on the display circuit.
Description
1. Technical field [0001] The invention relates to a device for realizing short-circuit point testing on-line of a cable, in particular to a device for realizing short-circuit point distance by using high-voltage pulse modulation OFDM, QAM, QPSK, ASK, PSK and FSK ranging methods. 2. Background technology [0002] Cable Fault Test System Multi-core cable is an important carrier for signal transmission or energy transmission that is widely used. Compared with the extensiveness of its application, its testing method is backward and has been paid more and more attention by the majority of technicians. For a long time, people have used manual testing of cables, but this method is time-consuming and laborious, and the accuracy is relatively poor. Aiming at the above problems, this paper proposes a new type of cable fault test system to realize the test of open circuit, short circuit, open circuit point and short circuit point of multi-core cables. [0003] 1. Test function In th...
Claims
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Application Information
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