CN201181837Y

CN201181837Y - Differential protective device of transformer

Info

Publication number: CN201181837Y
Application number: CNU2008200928142U
Authority: CN
Inventors: 刘会遵
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-18
Filing date: 2008-03-18
Publication date: 2009-01-14
Anticipated expiration: 2018-03-18

Abstract

The utility model discloses a transformer differential protection device, which comprises a CPU module, an interactive module, an alternative-current input module, a switching-value input-output module, a power source and a communication module; the CPU module is connected with the switching-value input-output module; the alternative-current input module, the power source and the communication module are respectively connected with the CPU module. The transformer differential protection device is mainly used for protecting the interior of the transformer and the interphase short circuit of the leading-out wire and the insulation bushing, and can also be used for protecting the inter-turn short circuit of the transformer; the protection zone is arranged between two current mutual inductors that are arranged at both sides of the transformer. The device adopts the protection that when the short-circuit malfunction is happened in the protection zone, the unbalancing power is caused by the current at both sides of the transformer in the differential circuit. At the same time, the device can also have the protection functions such as fixed time lag and inverse time lag over-current protection, thermal over-load protection, over-voltage protection, low-voltage protection, and the like, and has wide application range.

Description

The transformer differential protection device

Technical field

The utility model relates to the transformer technology field, relates in particular to a kind of transformer differential protection device.

Background technology

Transformer is to make according to the principle of electromagnetic induction, and transformer has the coil of two independently shared iron cores.Be called primary coil and secondary coil respectively.The direction of alternating current and size are time dependent, and primary is led to when going up alternating current, has produced alternating magnetic fields in the iron core of transformer, at the secondary identical alternating voltage of frequency that just induces. and the turn ratio of the primary and secondary coil of transformer equals voltage ratio.Transformer can only change alternating voltage, can not change direct voltage, because galvanic direction and size are constant, can not produce alternating magnetic field by transformer.

But, transformer in use, various problems can appear, such as: the phase fault of transformer inside and lead-out wire and insulating sleeve, turn-to-turn short circuit or occur such as overvoltage, overpower, loss of excitation, overheated or the like the transformer operate as normal that influences.

The utility model content

The technical problems to be solved in the utility model provides a kind of transformer differential protection device.

For solving the problems of the technologies described above, the purpose of this utility model is achieved through the following technical solutions.

A kind of transformer differential protection device comprises: CPU module, human-computer dialogue module, interchange inputting modular unit, switching value input and output module, power supply and communication module; Described CPU module links to each other with switching value input and output module by data/address bus, and described interchange inputting modular unit, power supply and communication module link to each other with described CPU module respectively with the human-computer dialogue module.

Wherein, described CPU module comprises CPU, A/D sampling A, RAM and flash memory.

The beneficial effects of the utility model are as follows:

Transformer differential protection device provided by the utility model; be mainly used to protect the phase fault of transformer inside and lead-out wire and insulating sleeve; and also can be used to protect the turn-to-turn short circuit of transformer, its protection zone is adorned between the current transformer in transformer one, two side.It is to utilize the uneven electric power that transformer both sides electric current causes when being short-circuited fault in the protection zone and a kind of protection of moving in differential circuit.Simultaneously, this device can also play a series of defencive functions such as specified time and inverse-time overcurrent protection, thermal overload protection, overvoltage/under-voltage protection, and it is of many uses.

Description of drawings

Fig. 1 is the utility model structure drawing of device.

Embodiment

For ease of the utility model is further understood, now reach specific embodiment in conjunction with the accompanying drawings the utility model is described in detail.

See also shown in Figure 1ly, comprise CPU module 101, human-computer dialogue module 102, exchange inputting modular unit 105, switching value input and output module 104, power supply and communication module 103; CPU module 101 links to each other with switching value input and output module 104 by data/address bus, exchanges inputting modular unit 105, power supply and communication module 103 and human-computer dialogue module 102 and links to each other with CPU module 101 respectively.

Wherein, CPU module 101 is core modules of device, mainly contains the A/D sampling A, RAM, FLASH EPROM, formations such as CPU.High performance CPU and jumbo RAM and FLASHEPROM make device that powerful defencive function, perfect management function, a large amount of information stores be arranged.The fully integrated A/D chip of 16 precision has that sampling precision height, sample rate are fast, the characteristics of sampling good stability.Integrated software self-checking system, the measure error that can be produced by environmental change from dynamic(al) correction need not artificial adjustment.Wherein CPU is that its operational clock frequency is 20 megahertzes based on TMS320C32 floating-point operation, 32 digital signal processor (DSP).

The major function of human-computer dialogue module is to realize the transmitter to the order of device and the various information of display unit, and it is equivalent to the keyboard of computer and the combination of display.By this module can be easily to the adjusting of protective device function and definite value, check various protection information and device maintenance information.The LCD display floater shows 2X16 character.

Exchange inputting modular unit and mainly comprise electric current and voltage input, also have corresponding module band to measure the input and output interface, can be used as electric energy measurement; Power supply and communication module major function are for device provides reliable source of power and realizes protection and the communication of monitoring, and have the house dog supervisory relay, and one road RS485 communication interface can be provided.

The utility model transformer is the design of protection down, and by domestic general requirement, the tranformer protection configuration of different electric pressures and varying number volume can be different, and we mainly do the protection classification according to the transformer of difference volume number.As two volumes become, two volumes, three branches become, three volumes become, three volumes, four branches become, three volume quintafurcations become.

More than a kind of transformer differential protection device provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims

1, a kind of transformer differential protection device is characterized in that, comprising: CPU module, human-computer dialogue module, interchange inputting modular unit, switching value input and output module, power supply and communication module; Described CPU module links to each other with switching value input and output module by data/address bus, and described interchange inputting modular unit, power supply and communication module link to each other with described CPU module respectively with the human-computer dialogue module.

2, transformer differential protection device according to claim 1 is characterized in that, described CPU module comprises CPU, A/D sampling A, RAM and flash memory.