A kind of intelligent power distribution transformer overload protective device
Technical field
The utility model relates to a kind of overload protection arrangement, especially a kind of intelligent power distribution transformer overload protective device.
Background technology
More and more because of Add User now (being mainly the user of factory), it is also increasing to apply to install capacity, and frequent generation transformer in service burns because of user's overlond running or seriously reduces transformer useful life.Thereby be badly in need of user transformers is carried out overload protection research, user transformers can be moved on safety economy ground.Existing technology is general only installs microcomputer protecting device at 10kV distribution transforming cabinet, sets current value.The method error is bigger, can not accurately carry out overload protection.
The utility model content
For satisfying the needs in market, the overload protection arrangement that the utility model proposed has solved the problem of distribution transformer overlond running, and the protection transformer does not reduce useful life or damage because of overlond running.
The technical scheme that the utility model is taked is:
A kind of intelligent power distribution transformer overload protective device; Comprise current measuring device, tripping controller and switch trip gear on the total input-wire switch of the low-pressure side that is installed in distribution transformer; Wherein said current measuring device is connected with supply line and obtains current signal; Its output is connected with the signal input part of said tripping controller; The output of said tripping controller is connected with the control end of switch trip gear controlling the action of said switch trip gear, and said switch trip gear and said total input-wire switch be interlock mutually.
The beneficial effect of the utility model is:
For solving the problem of distribution transformer overload protection; The utility model is installed overload protection in the low-pressure side of supply line; By the actual load current value configuration switch trip time of distribution transforming; Damage or reduce useful life to reach the protection distribution transforming, distinguish the misoperation that the big electric current that causes because of the powerful device startup produces simultaneously because of overload time is long.Compare with existing safeguard measure, have the precision height, protect advantages such as flexible.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the wiring schematic diagram of the utility model.
Embodiment
Intelligent power distribution transformer overload protective device disclosed in the utility model is installed on the total input-wire switch 5 of low-pressure side (0.4kV) of distribution transformer 4; It comprises current measuring device 1, tripping controller 2 and switch trip gear 3, so that distribution transformer 4 is carried out intelligent overload protection.
In the embodiment shown in fig. 1; Current measuring device 1 is connected with the supply line of 0.4kV side and obtains current signal; Its output is connected with the signal input part of tripping controller 2; The output of tripping controller 2 is connected with the control end of switch trip gear 3 with the dropout of control switch trip gear 2 action, certainly, switch trip gear 2 must with total input-wire switch 5 interlock mutually.
The size of current that current measuring device 1 monitoring is in real time passed through on the total input-wire switch 5 of distribution transformer 4; When it surpasses preset load current value; Obtain the current value signal and signal passed to the tripping controller 2 of installation; The timer of building in the tripping controller 2 picks up counting according to the signal that receives; If when current value was still greater than preset rated value when timing finishes, tripping controller 2 sent actuating signals and gives switch trip gear 3,3 actions of switch trip gear make the total input-wire switch trip of low-pressure side.When timing finished, if current value is less than rated value (this is generally powerful device and starts the transient high-current that causes), switch trip gear 3 was failure to actuate, and the timer of tripping controller 2 resets.
The utility model is installed overload protection in the low-pressure side of supply line; By the actual load current value configuration switch trip time of distribution transforming; Damage or reduce useful life to reach the protection distribution transforming, distinguish the misoperation that the big electric current that causes because of the powerful device startup produces simultaneously because of overload time is long.Compare with existing safeguard measure, have the precision height, protect advantages such as flexible.
The above be the utility model preferred embodiment, it does not constitute the restriction to the utility model protection range, so long as realize that with essentially identical means the purpose of the utility model all should belong to the protection range of the utility model.