SY/T 5585.4-1993 Test methods for electrical parameters of seismic data transmission cables DC resistance, insulation resistance, working capacitance simulation and other tests SY/T5585.4-1993 standard download decompression password: www.bzxz.net

SY/T5585.4--93, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Test Methods for Electrical Parameters of Seismic Data Transmission Cables
DC Resistancewww.bzxz.net
Published on 1993-03-27
Insulation Resistance
Simulation and Other Tests
Ministry of Energy of the People's Republic of China
Working Capacitance
Implemented on 1993-09-01
Test Methods for Electrical Parameters of Seismic Data Transmission Cables in Petroleum and Natural Gas Industry Standard of the People's Republic of China
$Y/T 5585.4--93
Insulation Resistance, Working Capacitance Simulation and Other Tests DC Resistance,
Main Contents and Scope of Application
This standard specifies the measurement and test methods of electrical parameters of seismic data transmission cables, including DC resistance, insulation resistance, working capacitance, simulation, etc. This standard applies to the measurement and simulation test of DC resistance, insulation resistance, working capacitance, etc. of seismic data transmission cables. 2 Reference standards
GB3048.4 "Test methods for electrical properties of wires and cables - Test methods for DC resistance of wire cores" GB3048.6 "Test methods for electrical properties of wires and cables - Test methods for insulation resistance" GB5441.2 "Test methods for electrical properties of communication cables - Working capacitance test bridge method" 3 Test methods
3.1 Test the DC resistance of the power supply line pair and the data transmission line pair of the seismic data transmission cable according to the national standard GB3048.4. The test accuracy of the power supply line pair resistance is better than 0.022, and the test accuracy of the data transmission line pair resistance is better than 0.12. 3.2 Test the insulation resistance of the seismic data transmission cable according to the national standard GB3048.6. 3.3 Test the working capacitance of the seismic data transmission cable according to the national standard GB5441.2. 3.4 Simulation test
3.4.1 Principle of true test
3.4.1.1 The simulation test wiring of the telemetry seismograph is shown in Figure 1. CCU
Figure 1 Telemetry seismograph simulation test wiring diagram
CCU-telemetry seismograph central station: SU--telemetry seismograph data collection station: SDTC-ground digital transmission cable pair 3.4.1.2 Seismic digital transmission cable tester simulation code test wiring diagram as shown in Figure 2. 3.4.2 True test equipment
3.4.2.1 Telemetry seismograph central station (CCU) has the following functions: a: Send remote control command words to the field acquisition system and receive earthquake information words and status words, approved by the Ministry of Energy of the People's Republic of China on March 27, 1993 SU
Implementation on September 1, 1993
Programmable simulation
code generator
SDTCTR
SY/T 5585.4—93
Figure 2 Seismic digital transmission cable tester simulation code test wiring diagram b, simulation code sending, receiving and judging bit error rate. True code
Receiver
3.4.2.2 In addition to the functions of testing characteristic impedance, working attenuation, near-end and far-end crosstalk attenuation by pulse method, the seismic data transmission cable tester (SDTCTR) also has the function of simulation code testing. 3.4.2.3 The telemetry seismic data acquisition station (SU) has the following functions: a. Resend command words, status words and ground information words, b. Collect ground data, amplify and filter the analog signal to the ground, and perform instantaneous floating point amplification and A/D conversion c. Send the station code information word and status word, and receive the remote control command and status word of CCU. 3.4.2.4 The damage test system composed according to the drawing must meet the daily inspection standard. 3.4.3 Sample preparation for simulation test
3.4.3.1 Test according to the wiring in Figure 1, and the sample is 240 or 120 finished cables of manufacturing length. 3.4.3.2 Test according to the wiring in Figure 2, and the sample is the finished relay of manufacturing length. 3.4.4 Simulation test steps
3.4.4.1 When testing the connection in Figure 1, follow the steps below: a. Taking a single station and a single channel as an example, the telemeter seismograph sets up 240 ground transmission cables and 240 acquisition stations, sets the status word, etc. b. Set the parameters of the telemeter seismograph as follows: 240 channels, 21ms sampling interval, or 120 channels, 1ms sampling interval. C. Start the telemeter seismograph to collect and record ground data (conventional method). The following fault codes shall not appear during the test: too long transmission time, big line parity error, word transmitted on the live line is not equal to the word received, wrong arrangement start acquisition, an extra word returned from the big line, wrong identification of the person or small end on the big line, etc. d. Or write a B + 19-bit pseudo code program, send and receive cyclically, and judge the error code. 3.4.4.2 When testing with the connection in Figure 2, follow the steps below: a. Program the transmission word consisting of 26-bit serial code bits, and send it to the tested line pair through the programmable error code generator. b. After receiving, compare it bit by bit with the program content. . All the transmission words of the programmed error code telemeter seismograph are sent and received according to the comparison of item a and item b to detect whether there is an error bit. 3.4.5 Simulation test results and calculations
3.4.5.1 Test with the connection in Figure 1. This is an extreme transmission test. If the instrument displays normal, all 240 cables are qualified. 3.4.5.2. Test with the connection in Figure 2. If the simulation code 10\hit is sent, the received code bit is 1bit, and the bit error rate of the tested line pair is better than 10-a, it is qualified.
3.4.6 Notes
The error code programming of different models of telemeter seismographs is different. 2
Additional explanation,
SY/T5585.4—93
This standard is proposed and managed by the Petroleum Exploration and Development Instrument Professional Standardization Committee. This standard was drafted by Xi'an Petroleum Institute, Xi'an Petroleum Exploration Instrument Factory, Geophysical Exploration Instrument Company, Xi'an Institute of Geology and other units.
The drafting persons in charge of this standard are Lv Jiao, Shi Quanbao and Jin Shibai.
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