CN211293172U

CN211293172U - On-line monitoring instrument for insulation resistance of wind driven generator

Info

Publication number: CN211293172U
Application number: CN201921887165.XU
Authority: CN
Inventors: 何蔚然
Original assignee: Hefei Zhizhen Electronic Technology Co ltd
Current assignee: Hefei Zhizhen Electronic Technology Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-08-18
Anticipated expiration: 2029-11-05

Abstract

The utility model relates to a aerogenerator insulation resistance on-line monitoring appearance field discloses an aerogenerator insulation resistance on-line monitoring appearance, include first detection voltage output port and the second detection voltage output port of being connected with the stator winding and the rotor winding of generator respectively, first detection voltage output end is connected with first relay, the normally open contact ground connection of first relay, this scheme still provide an aerogenerator insulation resistance's on-line measuring method, the utility model discloses an aerogenerator insulation on-line monitoring appearance equipment is the cooperation of aerogenerator and uses, can detect the stator winding group of generator respectively to ground insulation resistance value, rotor winding group to ground insulation resistance value, the insulation resistance value of the three groups of insulation resistance value parameters altogether such as the insulation resistance value between stator and rotor.

Description

On-line monitoring instrument for insulation resistance of wind driven generator

Technical Field

The utility model relates to a aerogenerator control field, more specifically says, in particular to aerogenerator insulation resistance on-line monitoring appearance.

Background

With the continuous popularization and application of clean energy sources such as renewable energy sources of solar energy, wind energy, tidal energy, biological energy and the like, particularly the continuous maturity of wind energy technology, the economic feasibility value is higher, and the method is ideal development energy source. Compared with other energy sources, the wind energy has the obvious advantages that: the energy is huge in accumulation amount, wide in distribution and free of pollution, and is an inexhaustible renewable energy source; the wind power generation has no fuel problem, and cannot generate radiation or carbon dioxide pollution, and cannot generate radiation or air pollution; also, wind instruments are far cheaper than solar instruments from an economic point of view. China has large wind energy storage capacity and wide distribution range, even is richer than water energy. The wind energy is reasonably utilized, thereby not only reducing the environmental pollution, but also reducing the pressure of more and more energy shortage. From the perspective of the current technical maturity and economic feasibility, the wind energy is most competitive, from the middle stage, the prospect of the global wind energy industry is quite optimistic, and the governments of various countries continuously come out of renewable energy source encouraging policies, so that huge power can be provided for the rapid development of the industry in the coming years. According to expectations, asia and america will become the most growing potential areas in the coming years. The installed wind power capacity in China will realize a high-speed increase rate of 30% per year. Therefore, the prospect of wind power generation is very large, and the investment quantity of wind power equipment is also very large.

Because the kinetic energy of wind power generation is wind, and wind energy equipment is installed on open fields or shallow sea levels, the engine stops running when no wind power exists, the engine equipment is gradually cooled by heat, at the moment, the equipment is most easily corroded, damaged and damaged by the erosion of humidity and salt corrosion, the insulation value of the engine equipment is seriously reduced, even the insulation value of the engine equipment to the ground is reduced to zero ohm, if the engine is forcibly started to run when wind comes at the moment, property losses such as burning of main equipment of the engine can be caused. Therefore, according to the customer requirements and the market research results, an insulation online monitoring device 'ZZFNJKY-I wind energy generator insulation resistance online monitoring instrument' aiming at the characteristics of the wind energy generator is developed. This insulating on-line monitoring appearance's utility model can be fine solution generator equipment stator, rotor winding insulating to ground and the insulating decline or the short circuit problem between stator, the rotor winding, discovery problem in time reports to the police and shutting equipment, handles as early as possible, avoids loss of property such as equipment burns out.

Because wind power generation is still in the development stage, still imperfect on-line monitoring equipment to wind power generator's insulation, even just do not have, traditional detection is that the manual megger detects, and this kind of detection just also once only detects before equipment fixing puts into operation, and later stage is because of the work load is big, and various reasons such as inconvenient just are not detecting, unable on-line measuring and remote communication, just also can not find the problem in time to lock up the protection equipment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an on-line monitoring appearance of aerogenerator insulation resistance and monitoring method, the utility model aims at solving the above-mentioned insulating scheduling problem of online detection equipment that can not, insulating detection equipment requires can on-line measuring, can accomplish functions such as warning shutting, remote communication, alarm record, man-machine dialogue.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a aerogenerator insulation resistance on-line monitoring appearance, includes the first detection voltage output port and the second detection voltage output port that are connected with the stator winding and the rotor winding of generator respectively, first detection voltage output end is connected with first relay K1, the normally open contact ground connection of first relay K1, the normally closed contact of first relay K1 is connected with one of the normally open contact and the normally closed contact in the third relay K3, second detection voltage output port is connected with second relay K2, the normally open contact ground connection of second relay K2, the normally closed contact of second relay K2 is connected with the other one of the normally open contact and the normally closed contact in the third relay K3, through third relay K3 inserts the detection voltage, the utility model discloses an online monitor equipment of aerogenerator insulation is that wind energy generator cooperatees and uses, can detect the stator winding of generator to ground insulation resistance value, rotor winding to ground insulation resistance value, the insulation resistance value between stator and the rotor etc. altogether three insulation resistance value parameters to and the absorption ratio of above-mentioned three insulation resistance value of group, remote transmission to well accuse room, the quality grade of the technical staff of being convenient for analysis generator, arrange work such as maintenance and maintenance as early as possible, guarantee that generator normal operating can not damage because of the trouble, the maximize improves the operating efficiency of generator.

Further, a first isolation resistor R1 is arranged between the stator winding and the first detection voltage output port, and a second isolation resistor R2 is arranged between the rotor winding and the second detection voltage output port, where the isolation resistor may be a single resistor or a plurality of resistors connected in parallel.

Further, the detection voltage that third relay K3 inserts is 500V direct current, and this detection voltage's concrete data should not become the utility model's restriction.

Further, the first relay K1, the second relay K2 and the third relay K3 are all reed pipe relays.

Compared with the prior art, the utility model has the advantages of:

1. the operation display of the wind power generator insulation monitor adopts a double 4-bit nixie tube display window to respectively display the corresponding winding position number and the static insulation resistance value thereof; the static insulation resistance value and the fault alarm record are consulted, and 21 groups of historical alarm records are totally available; when the static insulation resistance is ultra-low, the corresponding display value flickers to alarm; when the insulation value is reduced to a preset value, the output action of the passive contacts of the output relays KJ and KS corresponding to the monitor is controlled.

2. The insulation monitor of the wind energy generator is provided with two DC500V detection voltage output ends which are respectively 1Y output ports and 2Y output ports, the two DC500V detection voltage output ends are respectively connected with a stator winding and a rotor winding of the generator through two 1M omega isolation resistors, a shell of the generator and a 17 terminal (earth) of the insulation monitor are connected to form a detection loop, four groups of dry-yellow tube relays are arranged inside the insulation monitor, actions such as discharging and charging the winding of the generator to the earth are realized through software, switching is performed once every 60 seconds, the insulation value detection of the stator winding and the rotor winding of the generator to the earth and the insulation value detection of the stator winding and the rotor winding of the generator are realized, and insulation absorption ratio parameters among the stator winding, the rotor winding and the stator winding and the rotor winding are respectively recorded.

3. The insulation monitor of the wind driven generator is provided with 1 path of reed switch relay K which is used for being connected with a vacuum circuit breaking normally closed contact on an external control cabinet or a starting loop normally closed auxiliary contact to control 1Y and 2Y high voltage output of the insulation monitor of the wind driven generator, when the auxiliary contact is closed, high voltage output exists, otherwise, no high voltage output exists. The method is used for detecting the insulation value of each winding of the generator to the ground insulation resistance when the generator is out of operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a partial structure of a relay control circuit according to the present invention;

fig. 2 is a schematic diagram of a partial structure of the relay control circuit of the present invention;

fig. 3 is a power diagram of the meter of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

The first embodiment is as follows:

referring to fig. 1, 2, and 3, it is determined that the motor is in a power on/off state according to the state of the meter external relay K, and when the external relay K is closed, it indicates that the generator is in a power off state, otherwise, it is in a power on state. The controller can only allow for measurement preparation of the applied pressure between the stator, rotor windings and stator and rotor windings, respectively, including the action of discharging the stator and rotor windings to ground, when the generator is in a shutdown state.

When the external relay K is in a closed state, normally closed contacts of reed switch relays K1 and K2 in the controller are changed into normally open contacts according to commands, at the moment, the

ends

1Y and 2Y are connected with the ground through normally open contacts K1 and K2, the stator and rotor windings of the generator are respectively connected through isolation resistors R1, R2, 1Y and 2Y and are discharged to the ground for 1 minute, then normally open of the reed switch relays K1 and K2 are changed into normally closed states, at the moment, the relay K3 in the controller is sequentially and respectively changed from the normally closed state into normally open connection, DC500V voltage is respectively applied to the stator winding of the generator through the Y output port of the instrument 1, and the insulation values of 15 seconds and 60 seconds are recorded; then, applying voltage to the rotor winding by the DC500V voltage through a Y output port of the instrument 2, and simultaneously recording insulation values of 15 seconds and 60 seconds; the method comprises the steps that normally closed contact connections of reed switch relays K1 and K2 in a controller are changed into normally open contact connections according to program commands, at the moment, 1Y ports and 2Y ports are respectively connected with the ground through normally open contacts of K1 and K2 relays, a stator winding and a rotor winding of a generator are respectively connected through isolation resistors R1, R2, 1Y ports and 2Y ports, after discharging to the ground for 1 minute, a reed switch relay K1 is changed into a normally closed connection state from a normally open state, K2 keeps the normally open connection and the ground connection, K3 keeps the normally closed connection, the normally closed contact connection is connected with the 1Y port through K1, 1Y is connected with a stator winding through an isolation resistor R1, at the moment, the rotor winding and the isolation resistor R2 of the generator are connected with the normally open contact of the K2 through the 2Y port, the generator and the ground keep the connection state, at the moment, DC500V voltage output is used for applying pressure to the stator winding of the generator through, the 15 and 60 second insulation values between the stator winding and the rotor winding are recorded simultaneously and the cycle ends. Note: in the process of detecting the ground of each winding, when the insulation resistance value of the winding is reduced to a set threshold value (5M omega), the relay KJ and the relay KS act, and simultaneously, the panel alarm LED lamp is turned on corresponding to the insulation resistance value display value to flash an alarm prompt. The relay KJ is used for starting the output of the locking relay, the starting is allowed when the relay is normally closed, the KS is used for outputting the alarm relay, and the KS contact is changed from normally closed to normally open when the generator breaks down.

When the generator is in a starting state, the controller stops all the measurement work, and the generator running state lamp LED arranged on the instrument panel flashes and displays. The controller sends out the running information of the generator so as to be conveniently received by the master control room. The insulation values detected by the controller were all shown to be 999.9M Ω. At this point the discharge-to-ground command is invalidated as by the manual command winding.

When the generator is in a shutdown state, the generator running state lamp LED green light arranged on the instrument panel does not display. The controller sends out the information that the generator is in the shutdown state so as to be conveniently received by the master control room. The controller begins the above 1 and 2 workflows. The discharge to ground command is now valid as a manual command winding.

When the instrument is in an alarm state, the normally closed contact of the relay KJ is disconnected, the motor cannot be started, and the starting condition is met only when the normally closed contact of the relay KJ is in a normally closed state after the alarm fault is eliminated. The controller has a fault-clearing self-reset function.

The utility model discloses a patent product and other monitor's the biggest difference be can be simultaneously on-line measurement wind energy generator's three kinds of mode insulation resistance (generator stator winding insulation resistance to ground, generator rotor winding insulation resistance to ground, the winding insulation resistance between generator stator rotor), record and send insulation resistance, absorption ratio parameter (R15s/R60s) and trouble.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.

Claims

1. The utility model provides a aerogenerator insulation resistance on-line monitoring appearance, includes first detection voltage output port and the second detection voltage output port that is connected with the stator winding and the rotor winding of generator respectively, its characterized in that: first detection voltage output end 1Y is connected with first relay K1, first relay K1's normally open contact ground connection, first relay K1's normally closed contact is connected with one in the normally open contact and the normally closed contact in the third relay K3, second detection voltage output port 2Y is connected with second relay K2, second relay K2's normally open contact ground connection, second relay K2's normally closed contact is connected with another one in the normally open contact and the normally closed contact in the third relay K3, through third relay K3 inserts detection voltage.

2. The wind turbine generator insulation resistance on-line monitor according to claim 1, wherein a first isolation resistor R1 is provided between the stator winding and the first detection voltage output port, and a second isolation resistor R2 is provided between the rotor winding and the second detection voltage output port 2Y.

3. The wind driven generator insulation resistance on-line monitoring instrument according to claim 1, wherein the detection voltage of the third relay K3 is 500V direct current.

4. The on-line monitoring instrument for insulation resistance of wind driven generator according to claim 1, wherein the first relay K1, the second relay K2 and the third relay K3 are reed pipe relays.