Guangdong Power Hengyun, Power Plant Generator Transformer Group Protection Division Weiwen Guangdong Thermal Power Engineering Corporation. Guangzhou 510730, Guangdong Province, took appropriate measures to improve the process of debugging, 1 external interface asked Hengyun Power Plant 1 parent 210 river group generator group protection plant using the design requirements site modification. It seems that because of the gunshot, there are still many questions on the external interface, such as the terminal is not on, the cable can not be connected, and so on. After checking the manufacturer's principle, some of the cable connections were redesigned, basically solving this problem.
2 Rotor point earthing and two-point earthing protection This is the imitation protection of the cow production in the Qiaohai Relay Plant. There are two independent relays for rotor point grounding and two-point grounding. All of them use the principle of bridge balance, except that the rotor two-point grounding relay is on the panel, and a balance voltage and a balance adjustment potentiometer knob are added.
Rotor voltage input signals of the two relays are only the way, by switching the connecting piece, either provided to the rotor point grounding relay, or provided to the rotor 1 is called point grounding relay, its operation mode is è¿®1 often the rotor voltage signal is sent Give the rotor a grounded relay. When the rotor point is grounded, the rotor point ground relay relay sends a letter 6, and the flight hall operator switches the rotor power jade signal to switch to the two-point grounding relay. Adjust the balance, cast two points of ground protection, the specific logic principle 1.
It is inconvenient to operate. The rotor voltage is a strong electrical signal and it is not safe for the operator to carry out the switching operation. After the rotor point grounding signal, if you want to cast two points of ground protection, you must first switch the rotor voltage number to the two-point grounding relay input voltage tester and adjust it to make it smaller, and then you can cast two points to ground protection. The export pressure plate, once the operating sequence is wrong, it may be bowing tripping machine is the principle of this rotor two-point grounding protection is imperfect rotor point of the insulation resistance of the ground has been lower than the setting value, or even a metallic grounding. At this point, the point-grounded input signal is disconnected from the two-point grounding relay, and the monitoring of the point-to-ground signal is lost. When the point grounding is adjusted, the two-point grounding relay is used to balance the bridge, and when the balance voltage is zero, the two points are grounded to ensure the rotor point ground signal. The rotor two point ground circuit protection outlet tripping pressure plate is at the same time when the bridge does not appear again. When the balance exceeds the setting voltage value, the two-point grounding protection of the rotor will trip the tripper. But in fact, there are many factors that cause the unbalanced voltage of the bridge at this time. Because the grounding resistance may change when the rotor point is grounded, it may be unstable. When the grounding resistance at the same point changes, for example, from near the operating value to metallic grounding or from metallic grounding to a certain resistance value, it may cause The bridge balances the protection action. However, it is still actually grounded at this point. Another situation is that when the rotor is grounded from point to ungrounded, the balance of the bridge is still destroyed, which will also cause the two-point grounding protection of the rotor.
For this defect in the protection principle, we have envisaged modifications on the logic circuit. The rotor voltage signal is simultaneously input to the point grounding relay and the two-point grounding relay without switching; it is the normally open contact of the point grounding relay in the two-point grounding outlet circuit. Under normal circumstances, the grounding point is used to send a letter, and the two points are grounded to exit the pressure plate. When the rotor point is grounded, the operator records the reading of the balance voltage of the two-point grounding relay, and then adjusts to make the finger zero, and then puts in the two-point grounding protection outlet pressure plate. However, this method can only solve the problem of misoperation when the rotor is changed from point grounding to ungrounding. However, the misoperation caused by the change in ground resistance caused by point grounding cannot be solved.
3 Generator stator grounding protection The generator stator grounding protection consists of two parts, the fundamental zero-sequence voltage part, which can protect the range from the generator outlet to the neutral point of about 95; the other is the sub-harmonic part, which can To compensate for the lack of fundamental zero-sequence voltage, it is sensitive to the grounding reaction near the neutral point of the generator, and its protection scope is set in the range of 10, 15 near the neutral point. As the fundamental zero-sequence voltage and the sub-harmonic voltage are in the principle and protection point of the stator grounding protection, we suggest that the fundamental zero-sequence voltage part and the sub-harmonic voltage part be exported and sent separately. This proposal was accepted by the design.
The relay circuit of the Shanghai Relay Factory is not such a bachelor's degree. It is mainly engaged in electrical commissioning and installation work.
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3 Concluding remarks The correct use of the human resource 018 technology will greatly promote the development of organically integrated 18 systems that naturally form in the operational systems of the power supply sector, thus maximizing the overall scientific management level of the power supply enterprises, and increasing energy efficiency and efficiency. The overall goal of quality of service.
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