型hz相敏轨道电路（Phase sensitive track circuit of typeHz）

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1、97型25hz相敏轨道电路（Phase sensitive track circuit of type 97 25Hz）Fault finding method for phase sensitive track circuit of type 97 25HZTrack circuits are classified in nature from open circuit and short circuit faults. They can be divided into indoor and outdoor faults from the place where they are locat

2、ed. The order of search shall be indoor and outdoorTrack fault in track circuitWhen can not directly determine whether the fault in the room, using a multimeter first measuring the noseplate transmission and electricity line terminal, if send terminal voltage or power transmission line 110V 220V ter

3、minal voltage, indoor transmission part is good, and it indicates that the indoor power supply fault. If power terminal voltage is higher than the normal voltage, indoor electric terminals are broken, if the electric terminals decreased significantly than the normal voltage, should throw off by elec

4、trical terminal measurement, if the voltage increases, the fault point in the room, they should measure the local coil and lightning selenium pile is normal, if off by electrical terminal voltage measurement is still low the outdoor fault, should be timely to find outdoor.Two track track circuit out

5、door fault1, to find outdoor failure, the general law for;Pressure, flow, single high, walk, pressure, flow double low to see offGo in this direction and the fault is at the point of catastropheIf there is a high pressure and low flow phenomenon in the measurement, it can be judged as an open circui

6、t fault2 find open circuit faultsWhen an open circuit fault occurs, the phenomenon is that the voltage at the feeder terminal rises, the loop current drops, and the voltage at both ends of the sending terminal decreasesOpen circuit faults may occur in cables, chokes, transformers, track transformers

7、, adapters, and equipment connections, and may also occur on rails, wire ropes, rail connections, etc.Find open circuit fault, can use AC voltmeter, according to track circuit actual wiring, from the end of the power supply section to measure whether or not voltage, according to the voltage value ch

8、ange analysis and judgment.25Hz micro phase sensitive track circuit has been widely adopted in the electrified section because of its high return coefficient and high anti-interference ability. In order to improve the reliability and security of the track circuit in the substation, the scientific ma

9、intenance of the 25Hz microelectronic phase sensitive track circuit is the urgent problem to be solved at present.Constitution and characteristics of 125Hz microelectronic phase sensitive track circuitSend the equipment with the original 25Hz 1. 25Hz microelectronic phase sensitive track circuit for

10、 phase sensitive track circuit transmission device, receiving device by WXJ25 phase sensitive track circuit receiver (hereinafter referred to as the receiver) instead of the original 25Hz phase sensitive track electromagnetic relay, and cancel the capacitor in parallel with the original local coil.2

11、. local power supply of the receiver, track power supply, two phase difference, track receiving impedance, reliable receiving voltage, protection box parameter and so on are consistent with the original phase sensitive track relay. The local power supply of the receiver is changed from the original

12、driving mode to the sampling mode, so that the output current of the local power supply of the power supply screen is greatly reduced. The working power of the receiver is DC 24V, and each power consumption is less than 100mA.The return coefficient of the 3. receiver is greater than 90%, which not o

13、nly improves the transmission performance of the track circuit, but also improves the shunt characteristics of the track circuit.The 4. receiver has reliable phase selectivity and frequency selectivity, and can not only prevent interference of 50Hz traction current,And for other harmonic interferenc

14、e also have the same effect, so it has a strong anti-interference ability.The 5. track input adopts isolation transformer, so that it has strong lightning protection ability, and the protective relay of the original phase sensitive track relay is still preserved.2 common fault analysis and judgment

15、example2.1, the phenomenon of a faultThe red light zone of the track section, and the red and green indicator lights of the section are all lighted. The local power supply and the track receiving voltage of the receiver are normal, while the DC power supply or the DC output part is not normal, and t

16、he fault location is inside. Signal maintenance personnel should first in orbit test disc test (test track disc receiver AC input voltage from the track combination side terminal receiver, DC output voltage from track relay execution where the combination of side terminal), and then make a further a

17、nalysis and judgment.2.1.1 receiver DC output voltage is higher (higher than normal value 4V 6V) for disconnection fault1. execute the relay to disconnect between the side terminals of the combination.2. relay socket 1, 4 or 2, 3 plug contact is not good.3. relay sockets 2, 3 cross wire disconnectio

18、n.4. perform the relay coil disconnection.2.1.2 receiver DC output voltage low (less than 16.8V) or 0, and then test receiver socket terminals 32, 42 voltage1. if the voltage is high (higher than normal 4V to 6V), the receiver is disconnected from the side terminal of the relay combination.2. if the

19、re is no voltage or low (less than 16.8V), and then perform the relay pull off: if the DC voltage increases (higher than normal 4V 6V), the implementation of mixed line relay coil or receiver output portion of a circuit with a load capacity decrease; if the DC output voltage is still no change, or t

20、he output voltage amplitude is not enough. The following 4 conditions: the circuit fault receiver output part; the receiver socket contact 32, 42 insert the receiver to perform bad; relay between the mixed line (including the combination side terminal); the receiver socket 72, 82 plug bad contact ca

21、used the receiver DC power supply voltage is lower than 20.4V, or DC power supply voltage caused due to other reasons resulting in lower receiver output DC voltage is far less than the implementation of relay working voltage (JWXC-1700), but the red and green lights or receiver Still lit.2.2 malfunc

22、tion twoThe red band track section, and the red indicator light receiver indicator lights green, normal. The DC power supply and the local power supply voltage of the receiver are normal, while the track receiving voltage or the DC output part is not normal. To deal with such failures, it is also ne

23、cessary to judge whether the fault is indoors or outdoors, whether it is broken or mixed:1. if the test track receiver receives the voltage is normal, and no DC output voltage, for indoor fault, and the receiver fault (such as 9V or 5V DC power supply fault, voltage controlled oscillator crystal osc

24、illator fault or failure etc.).2., if the receiver receiver track voltage is low (less than 10V) or 0, and no DC output voltage, it is necessary to test the track terminal receiving voltage, there are several situations:If the track receiving voltage is still low or 0, need to throw off outdoor cabl

25、e,The test cable side no-load voltage: if the voltage is greater than 30V (no choke transformer section is far greater than 50V), then the fault in the room, mainly in the following 5 conditions: the noseplate to the receiver between the mixing line (including the noseplate to track frame combinatio

26、n side terminal, combination side terminal protection box, door to the box to the receiver; the receiver mixed line) between 73 and 83 contact socket insert the protection box to the receiver side; the broken line; a T1 receiver input transformer disconnection; the protection box inside break. If th

27、rown after the side rail voltage cable is still low or 0, then the fault in the outdoor (code section also check whether DGFJ suck it up and track the 220V power supply is sent). Nature of the fault may be mixed line (including rail insulation damage, this may cause the receiving voltage significant

28、ly reduce the insulation section on both sides of adjacent sections and fault or adjacent sections, the receiver tracks) or disconnected (including contact). The method of finding outdoor faults is the same as that of the original 25Hz phase sensitive track circuit.If the track receiving voltage is

29、much greater than 30V (no choke section rheological is much greater than 50V), that is the interior fault, and noseplate to track frame side terminal discontinuity.3. if the receiver receiver track voltage is much greater than 30V (no transformer transformer zone section is much larger than 50V), it

30、 shows that it is an indoor fault, and it is broken between the track side of the track frame and the terminal to the protective box.2.3 malfunction threeThe red light is on the track, and the receiver red indicator lights up and the green light flashes. The DC power and track received voltage of th

31、e receiver are normal, but the main reason is that the local voltage of the 110V is too low or the line is broken. There are usually several situations:The 1. receiver sockets 51 and 61 have no AC 110V voltage and are disconnected from the local power supply.2. receiver sockets 51 and 61 AC 110V vol

32、tage normal, for receiver socket 51, 61 plug contact bad or receiver internal 110V local power circuit disconnection.2.4 malfunction fourThe red band track section, and the receiver of red and green lights are off. This kind of fault is usually the receiver DC 24V power failure, and the receivers lo

33、cal power and track receive voltage are normal. There are mainly the following situations:1. receiver sockets 72 and 82 without DC 24V voltage and DC power supply disconnection.2., 82 receiver socket 72 24V DC voltage is normal, there may be the receiver of 1A fuse or poor contact circuit; the recei

34、ver socket contacts 72, 82 insert the bad; receiver integrated voltage regulator 7809 input circuit breaker.3 daily maintenance work1. the working voltage of the receiver is DC 20.4V to 26.4V. When the new device is used, it should be noted that the output voltage of the power supply panel should be

35、 adjusted at 23V to 25V.The working value of the 2. receiver is (12.5 + 0.5) V, the reliable working value is 16V, and the reliable work value is 10V. The receiving voltage of the receiver shall be no less than 18V when adjusting the condition.The output voltage of the 3. receiver output to the rela

36、y is 20V to 30V, and when the voltage is below 20V, the reliable operation of the relay (JWXC-1700) will not be guaranteed.The adjustment of the receiving voltage of the 4. receiver must be carried out in strict accordance with the requirements of the adjustment table,Under normal circumstances, a o

37、ne-time adjustment can be achieved. Special sections of ballast bed with serious leakage and larger variation of ballast resistance should be adjusted at the right time. When adjusting, the constant voltage ratio of the receiving end is not fixed, and the current limiting resistor of the sending end

38、 is not moved. The regulation of the two voltage of the transformer at the sending end or the adjustment of the current limiting resistor at the receiving end can meet the requirement of the working voltage of the receiver.5., to adopt the plug head diameter of 10.2mm continuous line and lead line,

39、prohibited the use of plug head diameter of 9.8mm connecting line and lead wire. Twist drill for drilling rails using 9.8mm, drilled holes in the should be in 9.9mm 10.0mm, engineering construction and maintenance must be strictly controlled, the elimination of the big hole, hole and plug screw coun

40、ter phenomenon, plug screw without crimping, ensure plug pin and rail tight and reliable contact. Choke transformer with wire and rail connections, a lead wire resistance were not greater than 0.1, so as to ensure the balance of the two rail traction current.6. from the rail through the lead wiring,

41、 to use a special dedicated concave groove fixed line, so that the lead line and rail separation, and maintain a certain distance (more than 30mm), so as not to cause mixed lines.The 7. choke transformer center connecting plate to install insulation sleeve, and to maintain the integrity, to prevent

42、the lead wire and the connecting plate collision center.8. rail insulation insulation should be no damage, no fertilizer, rail end edge fishplate bolt loose, high strength insulating rail fishplate bolt torque to meet the requirements, spike (fastener) dont touch the fish plate, especially the speed

43、 of road rail insulation at the cutting stock divided into elastic fastener at the bottom to add thick nylon seat 8mm the insulation protection. In the case of a choke transformer, the maintenance of rail insulation between two adjacent track circuit sections shall be particularly strengthened to prevent breakage or mixing of single track insulation.