电流互感器烧毁原因 Causes of current transformer burn down 　　(1)电流互感器二次开路，产生高电压，使电流互感器烧坏。 (1) the current transformer can open the road twice and produce high voltage, which will cause the current transformer to burn out. 　　(2)电流互感器使用年限过长绝缘老化，局部发生击穿或放电，产生过电压，使电流互感器发热烧坏。 (2) the current transformer USES the years of excessive insulation aging, and the local breakdown or discharge can produce overvoltage, causing the current transformer to burn out. 　　(3)电流互感器一次连接铝排接触面氧化过重，接触电阻过大，发热使电流互感器烧坏。 (3) the current transformer is overoxidized by the contact surface of the aluminum platoon, the contact resistance is too high, and the heat causes the current transformer to burn out. 　　(4)用户超负荷运行时间长，使电流互感器发热烧坏。 (4) the user is overloaded and runs long, which causes the current transformer to burn out. 　　2专用变压器用户断路器及接线存在问题 There are problems with circuit breaker and wiring of special transformer 　　(1)一般10kV真空断路器和SF6断路器都具备有过流和过负荷保护，出现相间短路及过负荷时断路器能正确跳闸，过电压则靠装设的氧化锌避雷器切除。我公司所管辖专用变用户高压计量用电流互感器都装设在隔离开关和断路器之间，这样一旦电流互感器出现问题，断路器和避雷器均不能切除故障，将由上一级断路器跳闸切除故障，从而扩大停电范围，同时也会因延时切除故障使电流互感器烧毁。 (1) general has 10 kv vacuum circuit breaker and SF6 circuit breaker have over current and overload protection, interphase short circuit and overload breaker tripping correctly, overvoltage, which is then installed zinc oxide lightning arrester resection. I companies under the jurisdiction of the special user current transformer used in high pressure measurement is installed between the isolating switch and circuit breaker, such problems as soon as the current transformer, circuit breakers and lightning arrester are unresectable failure, will be at the next higher level fault circuit breaker tripping excision, thus expanding the scope of the power outage, it will also make due to delay removal of fault current transformer burned. 　　(2)用户侧发生单相接地时，因断路器不跳闸，为寻找接地点需逐一拉合同一公用线上的下线分支，还会造成停用公用线，增大停电范围。 (2) when a single-phase grounding occurs on the user side, when the circuit breaker does not skip the switch, it is necessary to pull the contract of the offline branch of the utility line one by one, and the utility line will be disabled and the power outage will be increased. 　　(3)用户侧避雷器绝缘老化，不能有效防止过电压。 (3) the insulation of the user side arrester is too old to prevent overvoltage. 　　3采取对策 3. Take countermeasures 　　(1)装设看门狗断路器，避免分支故障波及整条馈线停电，尤其是能保证用电侧单相接地时分支断路器能可靠跳闸。 (1) install the watch-dog circuit breaker to avoid the branch fault affecting the entire feeder power failure, especially if the branch circuit breaker can be reliably tripping when the single-phase grounding is guaranteed. 　　(2)将计量用电流互感器接至断路器后面，以确保计量电流互感器故障时断路器和避雷器正确动作切除故障。 (2) connect the metering current transformer to the rear of the circuit breaker to ensure the correct operation of the circuit breaker and arrester during the fault of the metering current transformer. 　　(3)加强用户高压计量电流互感器及避雷器高压绝缘试验(规程规定不超过4年)，及早发现计量电流互感器和避雷器绝缘老化程度，及时更换，避免出现计量电流互感器烧坏造成停电。 (3) strengthen the users of high pressure metering current transformer and arrester hipot test (not more than 4 years inspection procedure), early detection measuring current transformer and surge arrester aging condition of insulation, change in time, avoid the measuring current transformer burn out due to power outage. 　　(4)定期清扫用户一次设备，减少污闪，避免绝缘降低。 (4) regularly clean the user's equipment once, reduce the flash and reduce the insulation.