CN201711313U

CN201711313U - On-line purging device for transformer

Info

Publication number: CN201711313U
Application number: CN2010201971166U
Authority: CN
Inventors: 陆振岳; 江蔚; 赵国君
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2010-05-20
Filing date: 2010-05-20
Publication date: 2011-01-19
Anticipated expiration: 2020-05-20

Abstract

The utility model relates to an on-line purging device for a transformer, which comprises a compressed air source, a pipeline connected with the compressed air source,, a spray nozzle installed on the pipeline and corresponding to a transformer bushing, a solenoid valve and a control circuit for controlling the opening/closing of the solenoid valve; the on-line purging device further comprises a humidity monitoring circuit and an insulation monitoring circuit; the control circuit is provided with a manual control switch in series connection with the solenoid valve, and a relay switch for the humidity monitoring circuit and an insulation supervising relay for the insulation monitoring circuit are respectively connected in parallel with the manual control switch and connected into the control circuit; according to the judgment of humidity of the porcelain insulator for the transformer and three-phase voltage of the transformer to insulation of the transformer, when the humidity is higher or the insulation is reduced, the on-line purging device is automatically started, and when the humidity is reduced, and the insulation recovery is conducted, the on-line purging device automatically returns, so that the insulation of the transformer is enhanced, and the automatic on-line purging is realized.

Description

The online blow device of a kind of transformer

Technical field

The utility model relates to the online blow device of a kind of transformer, belongs to transformer operation maintenance technical field.

Background technology

Transformer is the visual plant of power system, and its state quality directly influences the safe operation of power plant and electrical network, so the maintenance to transformer all has certain schedule maintenance pattern in the power plant.In case transformer puts into operation, just can not carry out power-on serving to the transformer body.But high-power transformer mostly is outdoor equipment, so dust in air, dirt etc. can make the sleeve surface dust deposit too much, runs into overcast and rainy, greasy weather etc. during special meteorological condition, can cause the flashover discharge, reduces the dielectric strength of transformer; Transformer is in operation, as the heavy snow sky, transformer top cover, sleeve pipe lead-in wire place accumulated snow have little time to melt, there is the accumulated snow phenomenon, to in time be rooted out and to be guaranteed that transformer normally moves accumulated snow, cause short circuit otherwise may cause accumulated snow to flood insulator, the very big potential safety hazard of operation existence to transformer also must have a power failure and could root out accumulated snow in this case transformer.Transformer stops not only influence production of labour, because the change of its method of operation also can make the operation of other equipment be in a weak link.In addition because the power station of outdoor operation, there is toy such as cat to crawl into the transformer top unavoidably, during operator on duty's walkaround inspection,, can only take the mode of shooing away because transformer is in operation, the operation of transformer is caused very big potential safety hazard.

The utility model content

The utility model wants the technical solution problem to be: the shortcoming that overcomes above-mentioned prior art, provide a kind of transformer online blow device, some that can run into transformer are carried out online processing such as situations such as accumulated snow, ponding, serious, the transformer insulated reduction of dust stratification, toy intrusions, and transformer is had a power failure, both improved the equipment reliability of operation, also having guaranteed simultaneously maintenance cleaning safety of persons, also is a kind of perfect and additional to the Repair of Transformer rules.

In order to solve above technical problem, the online blow device of a kind of transformer of the present utility model, form and comprise compressed air source, the pipeline that is connected with compressed air source, be installed in nozzle corresponding on the described pipeline with bushing shell for transformer, magnetic valve, and the control loop of controlling described magnetic valve unlatching and closing, it is characterized in that: also have the humidity monitoring circuit, the insulation monitoring loop, described humidity monitoring circuit comprises the humidity sensor that connects successively, comparator, relay switch, the insulation monitoring loop comprises the voltage transformer of transformer three-phase voltage, the insulating monitoring relay, described voltage transformer is connected with the procuratorial work input port of insulating monitoring relay; Described control loop has the hand control switch of connecting with magnetic valve, insulating monitoring relay Access Control in parallel with the hand control switch loop in the relay switch of described humidity monitoring circuit, insulation monitoring loop.

In order to realize that magnetic valve controls automatically, the utility model increases a humidity sensor at the transformer platform, and sets the higher limit and the lower limit of humidity by comparator, starts blow device automatically when humidity acquires a certain degree, and sends sound and light alarm; During transformer insulated reduction, also can not start this device if humidity reaches automatically, contact returns when humidity is lower than setting valve and insulation recovery to certain level, and sound equipment is eliminated, and the common judgement by humidity and insulation realizes that automatic on-line safeguards.

Determination methods insulate in the utility model: during owing to the three-phase voltage balance, residual voltage 3U0=0 on the voltage transformer, in case an insulation reduction is mutually arranged, transformer just has slight discharge flashover phenomenon, the insulating monitoring actuating of relay, residual voltage 3U0 〉=7 volt, this device just can automatic open device, as residual voltage≤1V, and humidity is when being lower than lower limit, and this device returns automatically.

The beneficial effects of the utility model are as follows:

1, can be used for the daily online ash that blows of transformer.

Because high-power transformer mostly is outdoor equipment greatly, therefore being in operation all fouling phenomenon can occur, causes insulator dielectric to reduce, and uses compressed air to clean, and transformer is carried out under the state that does not have a power failure.

2,, reach the purpose of on-line automatic purging by humidity, insulation monitoring.

The humidity by the transformer porcelain vase and the three-phase voltage of transformer are to transformer insulated judgement, the big or automatic blow device that starts when reducing that insulate when humidity, when humidity reduction and insulation recovery, again this device is returned automatically, reached and improved transformer insulated purpose, realized on-line automatic purging.

3, avoid transformer top insulator accumulated snow too much to be short-circuited.

If bad weather such as snow heavily, also can be by the monitoring of humidity and insulation, timely accumulated snow to the transformer top purges, and makes it that packing phenomenon not take place, and avoids accumulated snow to flood insulator, the phenomenon that causes transformer to be short-circuited.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the online blow device stereogram of the utility model transformer.

Fig. 2 is the online blow device vertical view of the utility model transformer.

Fig. 3 is the electrical schematic diagram of the online blow device control loop of the utility model transformer.

The specific embodiment

The online blow device of the transformer of present embodiment, as Fig. 1, Fig. 2, shown in Figure 3, its composition comprises: form and comprise air compressor (not drawing among the figure), the pipeline 1 that is connected with air compressor, be installed in nozzle corresponding on the described pipeline 2 with bushing shell for transformer, magnetic valve 3, and control loop 5 (see figure 3)s of controlling described magnetic valve unlatching and closing, it also has humidity monitoring circuit (not drawing among the figure), insulation monitoring loop (not drawing among the figure), described humidity monitoring circuit comprises the humidity sensor that connects successively, comparator, relay switch, the insulation monitoring loop comprises the voltage transformer of transformer three-phase voltage, the insulating monitoring relay, described voltage transformer is connected with the procuratorial work input port of insulating monitoring relay; Described control loop (as shown in Figure 3) has the hand control switch of connecting with magnetic valve, insulating monitoring relay Access Control in parallel with the hand control switch loop in the relay switch of described humidity monitoring circuit, insulation monitoring loop.

In this example, the two-way copper pipe (bite type) of φ 12*1 is connected to the compressor delivery outlet, the other end links to each other with two magnetic valves, the two-way copper pipe is terminal to be fixed together with transformer top platform oil pipe, and copper pipe resolves into the tubule of six different directions at the transformer top platform, add 6 nozzles (purging direction) at the tubule end respectively facing to transformer A, B, C three-phase high-voltage sleeve pipe and low-tension bushing, nozzle adopts rotary, can carry out umbrella to dust on the porcelain vase (bushing shell for transformer) and sleet etc. and purge.Consider that the compressor rated operating pressure is the creep age distance of 0.6Mpa and transformer, the level altitude of nozzle is consistent with the height of insulator bottom, and the horizontal range of design nozzle and sleeve pipe is 10cm.Humidity sensor and magnetic valve are installed on the transformer, and control loop is located in the transformer terminal case, and humidity monitoring circuit, insulation monitoring loop are positioned at the transformer master-control room.In this example, the fan AC power in the power input of air compressor and humidity sensor and the transformer terminal case is connected.

The mode that can manually open, stop by button is controlled magnetic valve.Opens solenoid valve when high contact of humidity or the connection of insulation reduction contact starts blow device, and magnetic valve returns automatically when humidity all returns to normal range (NR) with insulation, and this device stops purging.Realized the automatic online purging of transformer.

The utility model operation conditions is good, has not only solved the daily purging work of transformer top platform, has also guaranteed maintenance cleaning personnel's safety.

In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims

1. online blow device of transformer, form and comprise compressed air source, the pipeline that is connected with compressed air source, be installed in nozzle corresponding on the described pipeline with bushing shell for transformer, magnetic valve, and the control loop of controlling described magnetic valve unlatching and closing, it is characterized in that: also have the humidity monitoring circuit, the insulation monitoring loop, described humidity monitoring circuit comprises the humidity sensor that connects successively, comparator, relay switch, the insulation monitoring loop comprises the voltage transformer of transformer three-phase voltage, the insulating monitoring relay, described voltage transformer is connected with the procuratorial work input port of insulating monitoring relay; Described control loop has the hand control switch of connecting with magnetic valve, insulating monitoring relay Access Control in parallel with the hand control switch loop in the relay switch of described humidity monitoring circuit, insulation monitoring loop.

2. the online blow device of transformer according to claim 1 is characterized in that: described pipeline is terminal to be fixed together with transformer top platform oil pipe, purges highly consistent with the height of sleeve bottom.

3. the online blow device of transformer according to claim 2, it is characterized in that: humidity sensor and magnetic valve are installed on the transformer, and control loop is located in the transformer terminal case, and humidity monitoring circuit, insulation monitoring loop are positioned at the transformer master-control room.

4. the online blow device of transformer according to claim 3 is characterized in that: compressed air source is an air compressor, and the fan AC power in the power input of described air compressor and humidity sensor and the transformer terminal case is connected.

5. the online blow device of transformer according to claim 4 is characterized in that: described nozzle is a rotating nozzle, and the horizontal range of nozzle and bushing shell for transformer is about 10cm.

6. the online blow device of transformer according to claim 5 is characterized in that: have two described pipelines, every pipeline is equipped with three nozzles, and air-blowing is swept direction respectively facing to transformer A, B, C three-phase high-voltage sleeve pipe and low-tension bushing.