gdfgd Online car auxiliary circuit SS3B heavy grou

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Online car auxiliary circuit SS3B heavy ground protection and improvement of the reasons for malfunction

The critical current of the relay 77V/5.83kQ = 13mA. And JZ15D. 44Z-type auxiliary grounding relay compared to 6.8 times increase in sensitivity. b: D8. U204. KLC type. Coil resistance of 3790Q,[link widoczny dla zalogowanych], rated power consumption 2.8w. Rated power consumption calculated under the coil current 25mA. Voltage of 77V in accordance with its calculation of the critical action, allowing the critical current of the relay 77V/3.79kQ = 20mA. And JZ15D. 44Z-type auxiliary grounding relay compared to 4.4 times increase in sensitivity. ④ D. U204. KLC-and D8. U204. KLC relay is sealed relay, single pole double throw interlock for the type, on the same set of normally open, normally closed interlock, the sharing of a middle point. Relay energized action, the only other completely disconnected normally closed contact, normally open contacts began to close, normally closed, normally open interlock can not be synchronized action, is the order of action. Analysis of the logic of Figure 1 can be seen, FJDJ used to interlock the main jump off 406 ~ 407 is normally closed, to the interlocking self-sustaining and display is normally open, so the display and protection is not the same chain (or chain of the same nature), it is easy to happen, \3 measures adopted by reference 6K locomotive auxiliary circuit ground fault protection, using a current higher than 0.3A relay 76 until a threshold protection. ... ss3B locomotive auxiliary grounding protection from the current point of view there is no special design considerations, the low threshold, the sensitivity is too high. After that we quickly find the cause of the measures taken: ① the isolation diode JDGZ replaced 2DP5H type 2 series. ② All the transformation of secondary ground relay JZ15D. 44Z-type relay. The relay electric locomotive made in the traditional long-term heavy use, stable performance, low cost, this relay independent of each chain can be achieved normally open,[link widoczny dla zalogowanych], normally closed interlock action consistent. When installed, you can always open for a self-sustaining chain opening distance was slightly smaller adjustments, so that the relay is closed the first self-sustaining chain, action must of itself, eliminate the main and auxiliary ground makes no action after breaking jump shows the situation after transformation with the above measures, SS3B locomotive trouble-free show happened off the main jump phenomenon removed; auxiliary grounding the phenomenon of the complete elimination of malfunction. \4 Conclusion References 6K locomotive auxiliary circuit with ground fault protection features,[link widoczny dla zalogowanych], and its protection by the 0.3A threshold, part of the domestic locomotive auxiliary grounding protection threshold is low, sensitivity is too high. In addition, SS3B fixed multi car computer network control locomotives, locomotive computer system battery power only, but also protect the common ground power. Motorcycle batteries used for active protection, although the elimination of the protection \Luoyang Locomotive Depot uses multiple SS3B fixed multi car happens. Therefore, starting from the reliability of computer systems,[link widoczny dla zalogowanych], using computer control of the locomotive should avoid direct use of computer power as the locomotive circuit protection and auxiliary power circuit grounding. 6K locomotive main circuit ground fault protection circuit and the armature auxiliary circuit ground fault protection with passive protection. Excitation circuit of main circuit ground fault protection that the introduction of active protection, but the power supply is an independent power supply, and DC 110V circuit there is no relationship. Therefore, 6K locomotive used in Luoyang Locomotive Depot in the computer control system for 20 years is stable and reliable. On SS3B locomotive, the replacement of the relay model is solved FJDJ sensitivity too prone to malfunction problems. Long-term point of view, should SS3B locomotive circuit, auxiliary circuit ground fault protection testing and computer power supplies 110V DC isolation, the use of passive protection is an effective way to ground.

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