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在配电设备上工作的一般规定有哪些?

What are the general rules for working on distribution equipment?

2020-01-06

在配电设备上工作的一般规定有哪些?
配电设备[包括高压配电室、箱式变电站、配电变压器台架、低压配电室(箱)、环网柜、电缆分支箱]停电检修时,应使用第一种工作票;同一天内几处高压配电室、箱式变电站、配电变压器台架进行同一类型工作,可使用一张工作票。高压线路不停电时,工作负责人应向全体人员说明线路上有电,并加强监护。 
       在高压配电室、箱式变电站、配电变压器台架上进行工作,不论线路是否停电,应先拉开低压侧刀闸,后拉开高压侧隔离开关(刀闸)或跌落式熔断器,在停电的高、低压引线上验电、接地。以上操作可不使用操作票,在工作负责人监护下进行。 
       作业前检查双电源和有自备电源的用户已采取机械或电气联锁等防反送电的强制性技术措施。
在双电源和有自备电源的用户线路的高压系统接入点,应有明显断开点,以防止停电作业时用户设备反送电。 
       环网柜、电缆分支箱等箱式设备宜设置验电、接地装置。 
       进行配电设备停电作业前,应断开可能送电到待检修设备、配电变压器各侧的所有线路(包括用户线路)断路器(开关)、隔离开关(刀闸)和熔断器,并验电、接地后,才能进行工作。 
       两台及以上配电变压器低压侧共用一个接地引下线时,其中任一台配电变压器停电检修,其他配电变压器也应停电。 
       配电设备验电时,应戴绝缘手套。如无法直接验电,可以按3.3.3条的规定进行间接验电。 
       进行电容器停电工作时,应先断开电源,将电容器充分放电、接地后才能进行工作。
       配电设备接地电阻不合格时,应戴绝缘手套方可接触箱体。
       配电设备应有防误闭锁装置,防误闭锁装置不准随意退出运行。倒闸操作过程中禁止解锁。如需解锁,应履行批准手续。解锁工具(钥匙)使用后应及时封存。
       配电设备中使用的普通型电缆接头,禁止带电插拔。可带电插拔的肘型电缆接头,不宜带负荷操作。
       杆塔上带电核相时,作业人员与带电部位保持表5-1的安全距离。核相工作应逐相进行。


The first type of work order should be used when the power supply equipment [including high-voltage distribution room, box type substation, distribution transformer rack, low-voltage distribution room (box), ring main cabinet, cable branch box] is out of service; one work ticket can be used for several high-voltage distribution rooms, box type substations and distribution transformer platforms for the same type of work in the same day. When the high-voltage line is not powered off, the person in charge of the work shall explain to all personnel that there is power on the line and strengthen the monitoring.

When working on the high-voltage distribution room, box type substation and distribution transformer bench, whether the line is power-off or not, the low-voltage side knife switch shall be opened first, and then the high-voltage side isolating switch (knife switch) or drop out fuse shall be opened, and the power test and grounding shall be conducted on the high-voltage and low-voltage leads of power failure. The above operations can be carried out under the supervision of the person in charge of the work without using the operation ticket.

Before operation, check that the users with dual power supply and self provided power supply have taken mechanical or electrical interlocking and other mandatory technical measures to prevent reverse power transmission.

The high voltage system access point of double power supply and user line with self provided power supply should have obvious disconnection point to prevent reverse power transmission of user equipment during power failure operation.

The ring main unit, cable branch box and other box type equipment should be equipped with electricity inspection and grounding devices.

Before power failure operation of power distribution equipment, circuit breakers (switches), disconnectors (knife switches) and fuses of all lines (including user lines) that may transmit power to all sides of the equipment to be overhauled and distribution transformers shall be disconnected, and then the work can be carried out after power inspection and grounding.

When two or more distribution transformers share one grounding down lead at the low voltage side, one of the distribution transformers shall be cut off for maintenance, and other distribution transformers shall also be cut off.

Insulating gloves shall be worn when power distribution equipment is tested. If it is impossible to directly test electricity, indirect electricity test can be carried out according to the provisions of article 3.3.3.

When the capacitor is cut off, the power supply should be cut off first, and the capacitor can be fully discharged and grounded before operation.

When the grounding resistance of distribution equipment is unqualified, insulating gloves should be worn before contacting the box.

The power distribution equipment shall be equipped with anti misoperation locking device, which shall not be out of operation at will. It is forbidden to unlock during switching operation. If it needs to be unlocked, it should go through the approval procedures. The unlocking tools (keys) should be sealed up in time after use.

The common cable joint used in power distribution equipment shall not be plugged in and out with hot line. The elbow type cable joint that can be plugged in and out should not be operated with load.

When the charged phase is detected on the tower, the operator shall keep a safe distance from the live part in Table 5-1. Phase checking should be carried out phase by phase.

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