CN101651294A - Integral control system of distribution transformer - Google Patents

Abstract

The invention discloses an integral control system of a distribution transformer. A high-voltage electric control switch and a high-voltage fuse are arranged in sequence from a high-voltage power transmission line and the high-voltage output end of a distribution transformer; the input end of the distribution transformer is provided with a low-voltage electrical control switch; the low-voltage electrical control switch adopts the configuration of a low-voltage permanent-magnet automatic knife-like switch and a low-voltage fuse or adopts a permanent-magnet low-voltage air switch; the system also comprises an electric controller; the electric controller controls an operating part of the high-voltage electrical control switch and an operating part of the low-voltage electrical control switch;the system also configures an independent non-contact voltage regulating device for the distribution transformer; the system adopts a high-voltage electron to provide power for a control and protection circuit. The invention is beneficial to ensuring the voltage quality, improving the transformer efficiency and saving electric energy as well as manual labour and is suitable for high-voltage powertransmission and transformation stations.

Description

Integral control system of distribution transformer

Technical field

The present invention relates to the automatic control equipment in the power distribution network, especially relate to a kind of integral control system of distribution transformer.

Background technology

Distribution transformer is voltage transformation and an electrical energy transfer and directly distribute to user's key equipment in the distribution system, at the different user characteristics different capabilities is arranged, all kinds of distribution transformers of different sizes, the control and management of distribution transformer substantially all is ancient manual mode of operation at present, in the high-pressure side overwhelming majority all is to adopt manually-operated drop out fuse of insulating rod or distribution isolating switch, have only other big capacity responsible consumer to adopt expensive vacuum switch, equipment such as sulphur hexafloride circuit breaker or oil switch, and the operation with regard to these switches also mostly is manual actuating, operation is relatively heavier, it is very long to stop electric power feeding time, and not really safe.At step down side, adopt manually-operated switch with fuse etc. mostly, because problems such as running environment and equipment qualities, corrosion is serious mostly.Other has street lamp to become and fraction distribution transformer low voltage control adopts expensive A.C. contactor or air switch, and these switches all do not have phase shortage and neutral line break protection.The another one aspect, usually because a large amount of users' of different nature electricity consumption brings regular variation for the voltage of distribution system, and all power consumption equipments all have certain requirement to the power system voltage quality, and some requirement is also very strict.For the voltage that makes supply more stable, all be equiped with the transformer tap changer on the transformer, the distribution transformer tap changer is divided into non-excitation pressure adjustment switch and on-load tap changer, the on-load tap changer all is mechanical switch at present, mechanical breakdown is many, operate time is long, volume is big, cost an arm and a leg, therefore most distribution transformers all adopt the non-excitation pressure adjustment mode, this non-excitation pressure adjustment is to adjust voltage in the case of not charged, pressure regulation needs transformer to have a power failure, power failure formality complexity, sometimes transfer the bad transformer that also burns, also need to test contact situation in tap changer contact after the manual adjustment, this voltage regulating mode is time-consuming very long, sometimes just adjusted, system voltage changes again, need pressure regulation again, so this artificial pressure regulation does not catch up with the variation of system voltage at all, various reasons non-excitation pressure adjustment switch people seldom go to adjust, and a lot of users know that not distribution transformer is provided with tap changer, until transformer damages and also all do not transfer shunting switch, so this non-excitation pressure adjustment switch is substantially as illusory.Secondly the economical operation of distribution transformer also is in superficial situation again, more can't realize the operational management that becomes more meticulous in platform district.

Summary of the invention

In view of this, in order to overcome the defective of prior art, the object of the invention is to provide a kind of integral control system of distribution transformer, ensures quality of voltage, improves transformer efficiency, helps saves energy simultaneously, saves manpower.

For achieving the above object, integral control system of distribution transformer of the present invention by the following technical solutions:

High voltage input terminal from high voltage transmission line to distribution transformer sets gradually high-pressure electric control switch and high-tension fuse; The output of distribution transformer is provided with low-pressure electric controlled switch, and described low-pressure electric controlled switch adopts the form of low pressure permanent magnetism automatic disconnection switch and low-tension fuse combining and configuring or adopts the magneto low-voltage air switch; This system also comprises an electronic controller, this electronic controller comprises interface circuit, information gathering circuit, arithmetic processor and performance element, and the performance element of electronic controller connects the operating element of high-pressure electric control switch operating element and low-pressure electric controlled switch respectively; This system also disposes independently contactless voltage-regulating device for distribution transformer; This system adopts high-voltage electron to provide power supply for the operating element of electronics electronic controller, high-pressure electric control switch and the operating element of low-pressure electric controlled switch.

Further, described electronic controller also comprises compensation energy-saving unit and condition monitoring unit.

Further, when system of the present invention controlled distribution transformer and stops sending electricity, the operating procedure of described electronic controller was as follows:

When sending electricity, first closed high electric-controlled switch, electric current promptly are transported to the input of distribution transformer by high-tension fuse, closed low electric-controlled switch again after 20 seconds; During power failure, disconnect low-pressure electric controlled switch earlier, disconnect the high-pressure electric control switch after 10 seconds again.

Beneficial effect of the present invention is as follows:

Integral control system of distribution transformer of the present invention adopts in the distribution transformer high-pressure side and falls current limiting fuse or exhaust fuse and power electronics high voltage isolator (or power electronics on-load switch) commonly used, adopts power electronics type low pressure magneto isolating switch---fuse unit switch (or magneto low-voltage air switch) in the distribution transformer low-pressure side; The distribution transformer regulator adopts contactless automatic pressure regulating device.Wherein, electronic controller is independently controlled high-pressure electric control switch and low-pressure electric controlled switch; The control circuit of distribution transformer electronic controller control circuit and the distribution transformer contactless voltage-regulating device independent circuits of respectively doing for oneself; The switching program of electronic controller control distribution transformer down is accurate fast, therefore made things convenient for to stop sending electric control, and the operating efficiency that has improved has guaranteed the quality of distribution voltage.Cheap contactless automatic pressure regulating device is adopted in the distribution transformer pressure regulation; in the transformer high-voltage side power supply of electronics PT as a whole set of supervising device is housed in addition, and the monitoring and the protective device of zero line voltage and current (or power) and phase shortage also are housed in low-pressure side.Electronic controller compensation energy-saving unit compensation the unloaded reactive loss of distribution transformer, electronic controller condition monitoring unit has center line breaking protection and phase shortage monitoring function concurrently; In addition, electronic controller also provides interface circuit for load monitoring and distribution transformer economical operation arranged side by side, can conveniently add the economical operation hypervisor for the distribution transformer of parallel running.

Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.

Description of drawings

Fig. 1 is control of the box distribution transformer of the present invention system and protection electrical structure figure;

Fig. 2 is control of the desk-top distribution transformer of the present invention system and protection electrical structure figure;

Fig. 3 is integral control system of distribution transformer control of the present invention and protection philosophy block diagram.

Embodiment

Below in conjunction with drawings and Examples the present invention is further described.

As shown in Figures 1 and 2: the high-pressure side of distribution transformer 6 disposes high pressure inlet wire cable 1, high-pressure electric control permanent magnetism knife switch 2 (can adopt isolating switch or on-load switch), electronics PT3, high-tension fuse 4, lightning arrester 5.Distribution transformer 6 one sides are equipped with contactless voltage-regulating switch 7.The automatically controlled knife switch 8 of low-pressure side configuration low pressure permanent magnetism of distribution transformer 6 sets gradually low pressure isolating switch 9, low pressure branch switch 10 and outlet cable 11 formation low voltage control and protective circuits along separate routes in each shunt in the low pressure shunt circuit after the automatically controlled knife switch 8 of low pressure permanent magnetism.

Low pressure branch switch 10 can adopt electronic or manual air switch, plays short circuit and overload protection effect, and other is added with economize on electricity and phase shortage and center line (broken string) overvoltage protection integrated electric appliances.The automatically controlled knife switch 8 of low pressure permanent magnetism is DYN dynamic low-tension fuse---knife switch combined electrical apparatus, off-state have tangible cut-off point, can take off replacing again after melt fusing, and have the open-phase protection function.4 short circuits of high-tension fuse and the protective effect of overload lotus, high-pressure electric control permanent magnetism knife switch 2 can automatically controlled make and break Light Condition or little load distribution transformer.Distribution transformer high and low pressure side control power supply is all provided by the high-voltage electron 3 that is connected to high-tension cable 1 end.

The manipulative procedure of this distribution transformer system automatic control equipment is: during combined floodgate, high-pressure electric control permanent magnetism knife switch 2 closes earlier, electric current gives for distribution transformer 6 by high-tension fuse 4, the low-pressure electric controlled switch 8 that distribution transformer 6 outputs connect after 20 seconds closes a floodgate, low-voltage bus bar is charged, and right reaching send for as required each feeder line; When disconnecting, low-pressure electric controlled switch 8 disconnects earlier, cuts off transformer load, and high-pressure electric control switch 3 disconnects distribution transformer 6 dead electricity after 10 seconds.

If at distribution transformer high and low pressure side installing current sensor and relevant device, then can obtain the various information of distribution transformer, more valuable is can realize that for " hand in hand " distribution transformer economical operation reaches safety and the purpose of economizing on electricity.

The contactless voltage-regulating device 7 of distribution transformer 6 independently is installed in the external casing of transformer, and the pressure regulation tap of transformer is exported sleeve by high pressure, is coupled together by tailor-made cable and regulator.The Regulation Control of regulator and protection, regulator establishes one's own system.

As shown in Figure 3, electronic controller in the integral control system of distribution transformer of the present invention comprises interface circuit 12, information gathering circuit 13, arithmetic processor 14 and performance element 15, give arithmetic processor 14 information conveyance by interface circuit 12 and information gathering circuit 13, information after the calculation process is given executive component 15, the operating element of performance element 15 high-pressure electric control switch operating elements and low-pressure electric controlled switch is finished control action, and the state of distribution transformer provides corresponding demonstration by display circuit 16.The protection of integral control system of distribution transformer of the present invention and the power supply of control circuit change high voltage variable into low pressure 220V by high-voltage electron 3 and give power circuit 17, confess to each several part again and use.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications that those of ordinary skills make technical scheme of the present invention or be equal to replacement, only otherwise break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.

Claims (3)

1, integral control system of distribution transformer is characterized in that: the high voltage input terminal from high voltage transmission line to distribution transformer sets gradually high-pressure electric control switch and high-tension fuse; The output of distribution transformer is provided with low-pressure electric controlled switch, and described low-pressure electric controlled switch adopts the form of low pressure permanent magnetism automatic disconnection switch and low-tension fuse combining and configuring or adopts the magneto low-voltage air switch; This system also comprises an electronic controller, this electronic controller comprises interface circuit, information gathering circuit, arithmetic processor and performance element, and the performance element of electronic controller connects the operating element of high-pressure electric control switch operating element and low-pressure electric controlled switch respectively; This system also disposes independently contactless voltage-regulating device for distribution transformer; This system adopts high-voltage electron to provide power supply for the operating element of electronics electronic controller, high-pressure electric control switch and the operating element of low-pressure electric controlled switch.

2, integral control system of distribution transformer according to claim 1 is characterized in that: described electronic controller also comprises compensation energy-saving unit and condition monitoring unit.

3, integral control system of distribution transformer according to claim 2 is characterized in that: when this system controlled distribution transformer and stops sending electricity, the operating procedure of described electronic controller was as follows:

When sending electricity, first closed high electric-controlled switch, electric current promptly are transported to the input of distribution transformer by high-tension fuse, closed low electric-controlled switch again after 20 seconds; During power failure, disconnect low-pressure electric controlled switch earlier, disconnect the high-pressure electric control switch after 10 seconds again.

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