Transforming the interface circuit of 110kVSF6 circuit breaker Wang Ruijie Liu Meng Li Xianzhong 2, Wang Wenjiang 2 (1. Fuyang Electric Power Bureau, Fuyang 457000, Henan; 2. Xu Jichang South Company, Xuchang, Henan 461000).
There are many technical cooperation problems in the protection control loop, which are specifically solved as follows. The interface circuit of 2110kV circuit breaker 1 Introduction With the rapid development of power system, new equipment and new products like microcomputer protection and SF6 circuit breakers are constantly appearing. In order to ensure the safe and stable power system, the fault is quickly and reliably removed, the bureau has replaced the previous 110kV oil-less circuit breaker and replaced it with a new type of SF6 circuit breaker. However, the interface circuit of the SF6 circuit breaker interface circuit and the conventional 11CkV circuit breaker of the old switch, for example, the control circuit uses only the auxiliary contact of the circuit breaker and the pressure contact of the low pressure lockout circuit hydraulic mechanism to activate the pressure relay 1Y, 2Y. The 110kV circuit breaker generally adopts spring energy storage and SF6 gas arc extinguishing, and the switch mechanism itself is equipped with an anti-jump circuit and a low air pressure lock circuit. The switches replaced by our company include the LW25-126 SF6 circuit breaker produced by Xi'an High Voltage Switchgear and the LTB-145D SF6 circuit breaker manufactured by ABB. The interface circuit of LW2S126 type SF6 circuit breaker produced by Xi'an High Voltage Switch Factory.
3Proposal and solution of the problem When the interface circuit of LW2S126 SF6 circuit breaker is matched with the conventional control circuit, there are many repetitions and differences. For different problems, different solutions are made as follows.
All the locks SF gas-closed I LWQ5-126 type SF6 circuit breaker interface circuit pressure contact start pressure relay 1Y, 2Y to lock the trip circuit. The LW2S126 type SF6 circuit breaker interface circuit has been connected with a low pressure latching relay 63GLX. The density relay 63GL is activated when the gas pressure is lowered, and the negative of the trip circuit is disconnected; when the mechanism spring is not stored or is being When the energy is stored, the circuit breaker closing circuit is blocked by the motor control relay 88M contact. If the 1Y and 2Y relays in the low-pressure blocking circuit of the conventional 110kV circuit breaker are used, it is necessary to change the locking circuit in the interface circuit of the LW25-126 type SF6 circuit breaker, and the contact of the density relay 63GL is complicated and time-consuming. The locking circuit in the mechanism is reasonably perfect, so it is an ideal choice to use the locking circuit of the mechanism itself to remove the 1Y and 2Y relays in the low-pressure blocking circuit of the conventional 110kV circuit breaker.
3.2 Reconstruction of anti-jump circuit The conventional 110kV circuit breaker control circuit and LW2S126 type SF6 circuit breaker interface circuit are equipped with anti-jump circuit. If two anti-jump circuits are used at the same time, the following will occur: after the circuit breaker is closed, relay TW And 52Y can not return, the red light is flat, the green light flashes, the actual position of the circuit breaker cannot be judged; after the circuit breaker passes the closing-opening, the circuit breaker can not be used for the second time because the anti-jump relay 52Y of the mechanism does not return. Closing. The reason is the holding voltage matching problem of the relays TW and 52Y. Considering that the anti-jump circuit of the conventional 110kV circuit breaker has long running time, many operating experience, reasonable circuit, and the circuit is more complicated to be removed, the original circuit is still used, and the anti-configuration of the LW25-126 SF6 circuit breaker interface circuit is disabled. Jump circuit, that is, the connection between 52Y and negative power is disconnected, and insulation treatment is done.
3.3 Signal circuit breaker, driven by hydraulic mechanism, the signal has “pressure abnormalityâ€, “oil pump operation†and “tripping lockâ€. The signals required for the LW25-126 SF6 circuit breaker are SF6 low air pressure alarm "," energy storage motor overcurrent alarm "," control loop power failure", "motor loop power failure", "motor operation signal", SF6 low pressure Blocking", "heater power failure". The new switch has more signals than the old switch. Considering the limited number of spare cores of the control cable to the control box of the circuit breaker terminal box, the signal circuit of the new circuit breaker is changed, that is, the "motor running signal" and the "storage motor" are retained. "Outflow alarm", "SF6 low air pressure alarm", combine "control loop power failure", "motor loop power failure", "heater power failure" into "mechanical power failure", remove SF6 low air pressure blocking "signal (because When reporting the SF6 low air pressure blocking" signal, the SF6 low air pressure alarm "and" control loop disconnection "two signals, according to the simultaneous appearance of two signals, the SF6 low air pressure blocking signal" can be greatly reduced. Workload, reduce costs and reduce equipment blackout time.
4 Conclusion With the rapid development of the power system and the "two networks" transformation, the old circuit breakers must be replaced by new SF6 circuit breakers and vacuum circuit breakers. The above are some problems and solutions encountered by our bureau during the 110kV circuit breaker replacement process. From the situation of multiple circuit breakers that have been replaced, the operation effect is good. Nursing work; Liu Meng (1971) male, junior college, assistant worker engaged in relay protection work; Li Xianzhong (1963) male, engineer, engaged in power system communication and high frequency protection development research work.
Analysis and Improvement of High Frequency Channel DC Recording in July Wang Wei (Relay of Liaoning Dispatching Communication Center, Shenyang 110006, Liaoning, China) The loop and the matching with the recorder were analyzed, and the existing problems were pointed out and improved methods were proposed.
1 Overview In the system accident, there are many bad events in high-frequency recording. Whether it is the problem of the recorder or the problem of the transceiver has never been investigated. We have found in the laboratory and field tests on the transceivers and recorders used in the Liaoning power grid: the amplitude and load capacity of the DC high-frequency recording signals output by different types of transceivers are very different; different types of recording devices The high-frequency recording response and its own power consumption are also different. The problem is: in order to ensure that the performance of the transceiver is not affected, the transceiver manufacturing department is reluctant to provide a stronger recording source to the high-frequency recording branch. The wave device manufacturing department has not been able to make the power consumption of the wave recording device lower, and the sensitivity is higher. As a result, there is a parameter mismatch between the two from the R&D design. Who is the one who can’t talk about it, the manufacturing department I can't tell myself. We have checked the relevant regulations and the country has no specific quantitative standards. Therefore, the low rate of high-frequency recording is inevitably a common problem in the country. The root cause is no standard.
YBX-1 detection loop principle wiring detection and evaluation of several transceiver output high-frequency recording signals YBX-137, 39-end output signal measured its high-frequency recording wave detection circuit connected to the machine's "line filter", such as. The measured condition indicates that the detection circuit and parameter design on the YBX1 machine are unreasonable: the load capacity is low, the DC signal is weak, and the clutter interference is large. The detection circuit output terminal (T40) is shared with the high frequency channel. Field measured signals such as (a), (b), high-frequency channel signals (DC) are less than 2V. The principle of the detection circuit is as follows. From the figure, its detection circuit is taken out between the line filter and the power amplifier, and is output from the terminals 37 and 39, which meets the specified requirements, but the circuit design has serious defects, and the detection circuit can only output the weak signal of the diode tube voltage drop. Only a DC signal of less than 2V is unable to resist the interference of the clutter signal, and the recorder cannot reflect such a weak signal. Such a detection loop cannot be used.
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