CN105186453B - A kind of self learning type differential protection malfunction device on traction substation transformer - Google Patents
A kind of self learning type differential protection malfunction device on traction substation transformer Download PDFInfo
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- CN105186453B CN105186453B CN201510710614.3A CN201510710614A CN105186453B CN 105186453 B CN105186453 B CN 105186453B CN 201510710614 A CN201510710614 A CN 201510710614A CN 105186453 B CN105186453 B CN 105186453B
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Abstract
A kind of self learning type differential protection malfunction device on traction substation transformer, including main frame, the front side of main frame sets operation dish, the anterior of operation dish sets block cover, block cover both sides are equipped with guide holder, the guide groove coordinated with block cover side is opened up on the inside of guide holder, guide holder is fixedly mounted on the shell of main frame, the both sides of guide holder are respectively provided with cup grease box and elastomeric bladder, one end of the outlet connection elastomeric bladder of cup grease box, the other end of elastomeric bladder connects the guide groove on guide holder by connecting tube, the two ends of elastomeric bladder are respectively provided with check valve, the top of elastomeric bladder sets fixed plate, the upper end both sides of block cover set connecting plate, the pull bar parallel with guide holder is installed on connecting plate, the lower end of pull bar sets pressing plate, pull bar passes through fixed plate, screw mandrel is equipped with the transverse slat of block cover, the upper end connection motor of screw mandrel, startup button is set in block cover, startup button controlled motor starts and turned to, motor, cup grease box and fixed plate are installed on the shell of main frame.
Description
Technical field
The present invention, which is related to, belongs to field of electrical equipment, is exactly a kind of self study on traction substation transformer
Type differential protection malfunction device.
Background technology
When transformer during no-load closing moment, due to transformer core magnetic flux saturation, the presence of relict flux and iron core material
The nonlinear characteristic of material, can produce the sizable excitation surge current of amplitude, stable state is reached by the transient process of several weeks ripple, this
The switching current of individual impact often up to rated current 6-8 times.In addition, the excitation surge current will cause this regional voltage again
Fluctuation, cause the change with the transformer magnetizing current of its paired running, that is, produce and echo surge current.Thus it is likely to result in transformation
Device differential protection misoperation, transformer insulated damage, winding deformation, while reducing power system power supply quality.
Because excitation surge current is usually the peaked wave of being partial to reference axis side, and containing substantial amounts of harmonic component, therefore
In order to prevent excitation surge current from causing differential protection malfunction, transformer differential protection generally uses excitation surge current locking criterion, such as two
Subharmonic braking, waveform symmetry, interrupted angle principle etc..It is whole that the outstanding problem that these locking criterions are present is that restraint coefficient is difficult
It is fixed, too high false protection when can cause the transformer to drop is adjusted, adjusting too low can cause transformer to be protected when dropping the failure between lock
Tripping is protected, reliability and the sensitivity of differential protection is reduced, has when such phenomenon is in actual motion and dynamic simulation experiment
Occur.
In the prior art, the method that the scholars of power industry suppress for transformer excitation flow expands deep grind
Study carefully, and propose a variety of surge suppression methods, the method for suppressing excitation surge current is closed a floodgate because cost is low in wherein phase selection position, Yi Shi
Show, progressively the focus as research.The general principle that phase selection position is closed a floodgate is that appropriate voltage is selected according to the information of last time separating brake
Phase angle is closed a floodgate, but is due to precision of fuzzy controller and operating mechanism actuation time there is dispersion, therefore it is difficult to ensure that is opened
The actual closing phase angle in pass and the phase angle that theoretical calculation goes out are essentially equal, and its error directly determines the inhibition of excitation surge current.
At present, when being operated to differential protection malfunction device, maloperation is easily produced, operation mesh can not be played sometimes
, serious even causes reverse effect, major accident occurs.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of self learning type on traction substation transformer
Differential protection malfunction device.
The present invention to achieve the above object, is achieved through the following technical solutions：
A kind of self learning type differential protection malfunction device on traction substation transformer, including main frame, main frame
Front side sets operation dish, and the anterior of operation dish sets block cover, and block cover is made up of a riser and a transverse slat, and transverse slat is located at riser
Top, block cover both sides are equipped with guide holder, the guide groove coordinated with block cover side are opened up on the inside of guide holder, and guide holder is fixed
On the shell of main frame, the both sides of guide holder are respectively provided with filling cup grease in cup grease box and elastomeric bladder, cup grease box, profit
One end of the outlet connection elastomeric bladder of sliding cream box, the other end of elastomeric bladder connects the guide groove on guide holder, bullet by connecting tube
Property capsule two ends be respectively provided with check valve, the top of elastomeric bladder sets fixed plate, and the upper end both sides of block cover set connecting plate, connecting plate
Upper to install the pull bar parallel with guide holder, the lower end of pull bar sets pressing plate, and pull bar is passed through to coordinate on fixed plate, the transverse slat of block cover and set
Put and startup button is set in screw mandrel, the upper end connection motor of screw mandrel, block cover, startup button controlled motor starts and turned to, motor, lubrication
Cream box and fixed plate are installed on the shell of main frame.
Described cup grease in parts by weight, is consisted of the following composition：3-6 parts of aluminium hydroxide, 2-5 parts of magnesia, white oil
15-25 parts, 5-8 parts of melamine, 4-8 parts of ethylene glycol ether acetate, 3-6 parts of pentaerythritol stearate, lanolin 8-12
Part, 10-15 parts of ethylene glycol, 5-8 parts of superhigh molecular weight polyethylene fibers, 15-20 parts of silicone oil and modified polyacetal powder 20-25
Part；The modified polyacetal powder is obtained in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, 2,6- di-t-butyls-
0.05-0.08 parts of 4- methylphenols, 0.5-1 parts of carbamylurea, 0.5-0.8 parts of calcium carbonate, 5-10 parts of graphite and molybdenum disulfide
Mixed in 5-15 parts of addition high-speed mixers, then with vented twin-screw extruder in 100-150 revs/min of screw speed, barrel
Crushed after melting mixing at 190-230 DEG C of temperature, extruding pelletization with pulverizer, obtain the modified polyacetal powder that particle diameter is 1-5 μm
End.
Main control module is set in described main frame, the PORT COM attended operation disk of main control module, main control module respectively with
Difference current fast tripping protection circuit, differential protection circuit, excitation surge current determining device, overload locking regulating circuit and warning circuit connect
Connect.
Described cup grease in parts by weight, is consisted of the following composition：5 parts of aluminium hydroxide, 3 parts of magnesia, 20 parts of white oil,
6 parts of melamine, 5 parts of ethylene glycol ether acetate, 5 parts of pentaerythritol stearate, 10 parts of lanolin, 12 parts of ethylene glycol surpasses
22 parts of 5 parts of high molecular weight polyethylene fiber, 18 parts of silicone oil and modified polyacetal powder；The modified polyacetal powder according to
Lower method is obtained：In parts by weight, by 100 parts of polyformaldehyde, 0.06 part of 2,6- di-tert-butyl-4-methy phenols, carbamylurea
0.8 part, 0.6 part of calcium carbonate, mix in 10 parts of addition high-speed mixers of 8 parts of graphite and molybdenum disulfide, then use vented twin screw
Extruder is crushed at 120 revs/min of screw speed, 200 DEG C of barrel temperature after melting mixing, extruding pelletization with pulverizer, is obtained
Particle diameter is 3 μm of modified polyacetal powder.
Described cup grease is prepared using following methods：1. the preparation of modified polyacetal powder：In parts by weight, will be poly-
100 parts of formaldehyde, 0.05-0.08 parts of 2,6 di tert butyl 4 methyl phenol, 0.5-1 parts of carbamylurea, calcium carbonate 0.5-0.8
Mixed in part, 5-15 parts of addition high-speed mixers of 5-10 parts of graphite and molybdenum disulfide, then with vented twin-screw extruder in spiral shell
Crushed after melting mixing at 100-150 revs/min of bar rotating speed, 190-230 DEG C of barrel temperature, extruding pelletization with pulverizer, obtain grain
Footpath is 1-5 μm of modified polyacetal powder；2. the preparation of cup grease：In parts by weight, by 15-25 parts of white oil, ethylene glycol ethyl ether
4-8 parts of acetate, 3-6 parts of pentaerythritol stearate, 8-12 parts of lanolin, 10-15 parts of ethylene glycol, ultra-high molecular weight polyethylene
5-8 parts of fiber, 15-20 parts of silicone oil and step are 1. in gained 20-25 parts of addition reactors of modified polyacetal powder, in 100-150
25-35 DEG C is cooled to after being stirred 1-3 hours at DEG C, 3-6 parts of aluminium hydroxide is added, 2-5 parts of magnesia, 5-8 parts of melamine,
Stir, ground with colloid mill, obtain the cup grease of 1-5 μm of average grain diameter.
The advantage of the invention is that：The advantage of the invention is that：It is applied to be used for traction substation transformer in the present invention
On, the arrangement of the startup button in block cover and position are identical with operation dish, still, the function control motor of startup button.Behaviour
When making, first operating process is done simulated exercises in advance in operation dish, electric motor starting can by block cover in the presence of the screw mandrel on
Carry, now expose operation dish, formal operation can be carried out, operation with practice can increase the impression of operator, reduce wrong
Generation, it is ensured that the accuracy of operation by mistake.Block cover in lifting process, rubs larger, when block cover is promoted to most with guide groove repeatedly
During upper end, now pressing plate flattens elastomeric bladder with fixed plate, and elastomeric bladder resets when block cover resets, during the receipts of elastomeric bladder one one are put
Cup grease in cup grease box can be squeezed into guide groove, while smearing uniform in guide groove by block cover, reach lubrication
Effect.The present invention also has the advantages that compact, manufacturing cost simple for structure is cheap and easy to use.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；Fig. 2 is the cross section structure diagram along Fig. 1 line A-A；Fig. 3 is the I of Fig. 1
Partial enlargement structural representation；Fig. 4 is the internal structure schematic diagram of main frame 1 of the present invention.
Reference：The pull bar of 1 main frame, 2 motor, 3 screw mandrel, 4 startup button, 5 block cover, 6 operation dish, 7 guide holder, 8 pressing plate 9
The main control module of 10 cup grease box, 11 elastomeric bladder, 12 connecting tube, 13 guide groove, 14 fixed plate, 15 check valve, 16 connecting plate 17
The excitation surge current determining device 21 of 18 19 differential protection circuit of difference current fast tripping protection circuit 20 overload locking regulating circuit 22
Warning circuit.
Embodiment
A kind of self learning type differential protection malfunction device on traction substation transformer, as shown in Figure 1, Figure 2 with Fig. 3 institutes
Show, including main frame 1, the front side of main frame 1 sets operation dish 6, the anterior of operation dish 6 sets block cover 5, block cover 5 by a riser and
One transverse slat composition, transverse slat is located at the top of riser, and the both sides of block cover 5 are equipped with guide holder 7, and the inner side of guide holder 7 opens up and kept off
The guide groove 13 of 5 sides cooperation is covered, guide holder 7 is fixedly mounted on the shell of main frame 1, and the both sides of guide holder 7 are respectively provided with lubrication
Filling cup grease in cream box 10 and elastomeric bladder 11, cup grease box 10, one end of the outlet connection elastomeric bladder 11 of cup grease box 10, bullet
Property capsule 11 the other end by connecting tube 12 connect guide holder 7 on guide groove 13, the two ends of elastomeric bladder 11 are respectively provided with check valve
15, the top of elastomeric bladder 11 sets fixed plate 14, and the upper end both sides of block cover 5, which are set, installs and lead on connecting plate 16, connecting plate 16
To the parallel pull bar 9 of seat 7, the lower end of pull bar 9 sets pressing plate 8, and pull bar 9 is passed through to be equipped with fixed plate 14, the transverse slat of block cover 5
Startup button 4 is set in screw mandrel 3, the upper end connection motor 2 of screw mandrel 3, block cover 5, the controlled motor 2 of startup button 4 starts and turned to, motor
2nd, cup grease box 10 and fixed plate 14 are installed on the shell of main frame 1.In the present invention, the arrangement of the startup button 4 in block cover 5 and
Position is identical with operation dish 6, still, the function control motor 3 of startup button 4.During operation, first in operation dish 6 in advance
Operating process is done simulated exercises, motor 3, which starts, above to carry block cover 5 in the presence of screw mandrel 3, now reveal operation dish 6
Go out, formal operation can be carried out, operation with practice can increase the impression of operator, reduce the generation of mistake, it is ensured that operation
Accuracy.Block cover 5 in lifting process, rubs larger with guide groove 13 repeatedly, when block cover 5 is promoted to the top, now presses
Plate 8 flattens elastomeric bladder 11 with fixed plate 14, and elastomeric bladder 11 resets when block cover resets, elastomeric bladder 11 1 receive one put during can be with
Cup grease in cup grease box 10 is squeezed into guide groove 13, while smearing uniform in guide groove 13 by block cover 5, profit is reached
Sliding effect.
In order to keep lubricity, the present invention uses individually designed cup grease, described cup grease in parts by weight, by with
Lower composition composition：3-6 parts of aluminium hydroxide, 2-5 parts of magnesia, 15-25 parts of white oil, 5-8 parts of melamine, ethylene glycol ethyl ether acetic acid
4-8 parts of ester, 3-6 parts of pentaerythritol stearate, 8-12 parts of lanolin, 10-15 parts of ethylene glycol, superhigh molecular weight polyethylene fibers
5-8 parts, 20-25 parts of 15-20 parts of silicone oil and modified polyacetal powder；The modified polyacetal powder is obtained in accordance with the following methods：
In parts by weight, by 100 parts of polyformaldehyde, 0.05-0.08 parts of 2,6- di-tert-butyl-4-methy phenols, carbamylurea 0.5-1
Mixed in part, 0.5-0.8 parts of calcium carbonate, 5-10 parts of graphite and 5-15 parts of addition high-speed mixers of molybdenum disulfide, then use exhaust
Double screw extruder uses powder at 100-150 revs/min of screw speed, 190-230 DEG C of barrel temperature after melting mixing, extruding pelletization
Broken machine is crushed, and obtains the modified polyacetal powder that particle diameter is 1-5 μm.
The cup grease hardness is moderate, with high bearing capacity, low-friction coefficient, vibration resistance, impact resistance and permeability,
Antifriction performance is good, can effectively prevent apparatus to be damaged, and with excellent corrosion resistance, rustless property under the high temperature conditions can
Absorb substantial amounts of heat, it is ensured that equipment normal work under rugged environment.
Embodiment 1
A kind of cup grease, in parts by weight, is consisted of the following composition：3 parts of aluminium hydroxide, 2 parts of magnesia, 15 parts of white oil,
5 parts of melamine, 4 parts of ethylene glycol ether acetate, 3 parts of pentaerythritol stearate, 8 parts of lanolin, 10 parts of ethylene glycol, superelevation
20 parts of 5 parts of molecular weight polyethylene fiber, 15 parts of silicone oil and modified polyacetal powder；
The modified polyacetal powder is obtained in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, the uncles of 2,6- bis-
5 parts of 0.05 part of butyl -4- methylphenols, 0.5 part of carbamylurea, 0.5 part of calcium carbonate, 5 parts of graphite and molybdenum disulfide add high
Mix, then melted at 100 revs/min of screw speed, 190 DEG C of barrel temperature with vented twin-screw extruder mixed in fast mixer
Crushed after refining, extruding pelletization with pulverizer, obtain the modified polyacetal powder that particle diameter is 1 μm.
Embodiment 2
A kind of cup grease, in parts by weight, is consisted of the following composition：6 parts of aluminium hydroxide, 5 parts of magnesia, 25 parts of white oil,
8 parts of melamine, 8 parts of ethylene glycol ether acetate, 6 parts of pentaerythritol stearate, 12 parts of lanolin, 15 parts of ethylene glycol surpasses
25 parts of 8 parts of high molecular weight polyethylene fiber, 20 parts of silicone oil and modified polyacetal powder；
The modified polyacetal powder is obtained in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, the uncles of 2,6- bis-
15 parts of 0.08 part of butyl -4- methylphenols, 1 part of carbamylurea, 0.8 part of calcium carbonate, 10 parts of graphite and molybdenum disulfide add high
Mix, then melted at 150 revs/min of screw speed, 230 DEG C of barrel temperature with vented twin-screw extruder mixed in fast mixer
Crushed after refining, extruding pelletization with pulverizer, obtain the modified polyacetal powder that particle diameter is 5 μm.
Embodiment 3
A kind of cup grease, in parts by weight, is consisted of the following composition：4 parts of aluminium hydroxide, 4 parts of magnesia, 20 parts of white oil,
6 parts of melamine, 6 parts of ethylene glycol ether acetate, 5 parts of pentaerythritol stearate, 9 parts of lanolin, 13 parts of ethylene glycol, superelevation
22 parts of 7 parts of molecular weight polyethylene fiber, 18 parts of silicone oil and modified polyacetal powder；
The modified polyacetal powder is obtained in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, the uncles of 2,6- bis-
12 parts of 0.07 part of butyl -4- methylphenols, 0.6 part of carbamylurea, 0.7 part of calcium carbonate, 8 parts of graphite and molybdenum disulfide add high
Mix, then melted at 120 revs/min of screw speed, 210 DEG C of barrel temperature with vented twin-screw extruder mixed in fast mixer
Crushed after refining, extruding pelletization with pulverizer, obtain the modified polyacetal powder that particle diameter is 4 μm.
Embodiment 4
A kind of cup grease, in parts by weight, is consisted of the following composition：5 parts of aluminium hydroxide, 3 parts of magnesia, 20 parts of white oil,
6 parts of melamine, 5 parts of ethylene glycol ether acetate, 5 parts of pentaerythritol stearate, 10 parts of lanolin, 12 parts of ethylene glycol surpasses
22 parts of 5 parts of high molecular weight polyethylene fiber, 18 parts of silicone oil and modified polyacetal powder；
The modified polyacetal powder is obtained in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, the uncles of 2,6- bis-
10 parts of 0.06 part of butyl -4- methylphenols, 0.8 part of carbamylurea, 0.6 part of calcium carbonate, 8 parts of graphite and molybdenum disulfide add high
Mix, then melted at 120 revs/min of screw speed, 200 DEG C of barrel temperature with vented twin-screw extruder mixed in fast mixer
Crushed after refining, extruding pelletization with pulverizer, obtain the modified polyacetal powder that particle diameter is 3 μm.
The preparation method of the cup grease of component, comprises the following steps described in embodiment 1：
1. the preparation of modified polyacetal powder：In parts by weight, by 100 parts of polyformaldehyde, 2,6- di-t-butyl -4- methylbenzenes
Mixed in 0.05 part of phenol, 0.5 part of carbamylurea, 0.5 part of calcium carbonate, 5 parts of addition high-speed mixers of 5 parts of graphite and molybdenum disulfide
Close, then with vented twin-screw extruder at 100 revs/min of screw speed, 190 DEG C of barrel temperature melting mixing, extruding pelletization
Crushed afterwards with pulverizer, obtain the modified polyacetal powder that particle diameter is 1 μm；
2. the preparation of cup grease：In parts by weight, by 15 parts of white oil, 4 parts of ethylene glycol ether acetate, pentaerythrite is stearic
1. gained is modified for 3 parts of acid esters, 8 parts of lanolin, 10 parts of ethylene glycol, 5 parts of superhigh molecular weight polyethylene fibers, 15 parts of silicone oil and step
In 20 parts of addition reactors of polyformaldehyde powder, 25 DEG C are cooled to after being stirred 1 hour at 100 DEG C, 3 parts of aluminium hydroxide is added,
2 parts of magnesia, 5 parts of melamine, stirs, is ground with colloid mill, obtains the cup grease of 1 μm of average grain diameter.
The preparation method of the cup grease of component, comprises the following steps described in embodiment 2：
1. the preparation of modified polyacetal powder：In parts by weight, by 100 parts of polyformaldehyde, 2,6- di-t-butyl -4- methylbenzenes
Mixed in 0.08 part of phenol, 1 part of carbamylurea, 0.8 part of calcium carbonate, 15 parts of addition high-speed mixers of 10 parts of graphite and molybdenum disulfide
Close, then with vented twin-screw extruder at 150 revs/min of screw speed, 230 DEG C of barrel temperature melting mixing, extruding pelletization
Crushed afterwards with pulverizer, obtain the modified polyacetal powder that particle diameter is 5 μm；
2. the preparation of cup grease：In parts by weight, by 25 parts of white oil, 8 parts of ethylene glycol ether acetate, pentaerythrite is stearic
1. gained changes for 6 parts of acid esters, 12 parts of lanolin, 15 parts of ethylene glycol, 8 parts of superhigh molecular weight polyethylene fibers, 20 parts of silicone oil and step
Property polyformaldehyde 25 parts of addition reactors of powder in, at 150 DEG C stir 3 hours after be cooled to 35 DEG C, add aluminium hydroxide 6
Part, 5 parts of magnesia, 8 parts of melamine stirs, ground with colloid mill, obtains the cup grease of 5 μm of average grain diameter.
The preparation method of the cup grease of component, comprises the following steps described in embodiment 3：
1. the preparation of modified polyacetal powder：In parts by weight, by 100 parts of polyformaldehyde, 2,6- di-t-butyl -4- methylbenzenes
Mixed in 0.07 part of phenol, 0.6 part of carbamylurea, 0.7 part of calcium carbonate, 12 parts of addition high-speed mixers of 8 parts of graphite and molybdenum disulfide
Close, then with vented twin-screw extruder at 120 revs/min of screw speed, 210 DEG C of barrel temperature melting mixing, extruding pelletization
Crushed afterwards with pulverizer, obtain the modified polyacetal powder that particle diameter is 4 μm；
2. the preparation of cup grease：In parts by weight, 20 parts of white oil, 6 parts of ethylene glycol ether acetate, pentaerythrite stearic acid
1. gained is modified poly- for 5 parts of ester, 9 parts of lanolin, 13 parts of ethylene glycol, 7 parts of superhigh molecular weight polyethylene fibers, 18 parts of silicone oil and step
In 22 parts of addition reactors of formaldehyde powder, 28 DEG C are cooled to after being stirred 2 hours at 120 DEG C, 4 parts of aluminium hydroxide, oxygen is added
Change 4 parts of magnesium, 6 parts of melamine stirs, ground with colloid mill, obtains the cup grease of 4 μm of average grain diameter
The preparation method of the cup grease of component, comprises the following steps described in embodiment 4：
1. the preparation of modified polyacetal powder：In parts by weight, by 100 parts of polyformaldehyde, 2,6- di-t-butyl -4- methylbenzenes
Mixed in 0.06 part of phenol, 0.8 part of carbamylurea, 0.6 part of calcium carbonate, 10 parts of addition high-speed mixers of 8 parts of graphite and molybdenum disulfide
Close, then with vented twin-screw extruder at 120 revs/min of screw speed, 200 DEG C of barrel temperature melting mixing, extruding pelletization
Crushed afterwards with pulverizer, obtain the modified polyacetal powder that particle diameter is 3 μm；
2. the preparation of cup grease：In parts by weight, by 20 parts of white oil, 5 parts of ethylene glycol ether acetate, pentaerythrite is stearic
1. gained changes for 5 parts of acid esters, 10 parts of lanolin, 12 parts of ethylene glycol, 5 parts of superhigh molecular weight polyethylene fibers, 18 parts of silicone oil and step
Property polyformaldehyde 22 parts of addition reactors of powder in, at 120 DEG C stir 2 hours after be cooled to 30 DEG C, add aluminium hydroxide 5
Part, 3 parts of magnesia, 6 parts of melamine stirs, ground with colloid mill, obtains the cup grease of 3 μm of average grain diameter.
The main performance detection data of cup grease obtained by 1-4 of the embodiment of the present invention are as shown in table 1.
The main performance detection data of cup grease obtained by the embodiment 1-4 of table 1
Main control module 17, the PORT COM attended operation disk 6 of main control module 17, main control module are set in described main frame 1
17 is electric with difference current fast tripping protection circuit 18, differential protection circuit 19, excitation surge current determining device 20, overload locking pressure regulation respectively
Road 21 and warning circuit 22 are connected.The present invention uses differential protection circuit, excitation surge current determining device, overload locking regulating circuit point
Other that multiple signals are handled so that data are more fully directly perceived, exception occur can be alarmed by warning circuit 22,
Add the stability and reliability of system.
Realize the learning and memory to switching closing time, and the switching angle calculated with reference to excitation surge current suppressing method
Degree, extrapolates the execution moment of Transformer Close.During project demand is realized, for without two kinds of feelings under artificial demagnetization
All it is to employ separating brake phase due to the influence of transformer remanent magnetism when being closed a floodgate after condition, i.e., normal separating brake after combined floodgate and trip protection
The parallactic angle strategy equal with switching-on phase angle suppresses excitation surge current, and this is to be pushed away by the memory to separating brake moment phase angle
The phase angle of closing moment is calculated, so as to perform combined floodgate according to the switching angle；For the closing operation after artificial demagnetization, due to
There is no the influence of remanent magnetism, then without considering the memory to separating brake angle, because in this case, only needing first to A phase breakers
Closed a floodgate, now A phase phase angles are monitored in optimal reclosure time, selection is closed a floodgate in 90 ° of voltage phase angle, and remaining two
Closed a floodgate after 1/4 cycle, this control process is also by the reckoning and control to combined floodgate angle, according to the switching angle
Spend to perform combined floodgate.
The mode of self study of the present invention is
S01, switchs closing time self study：The first time remote control combined floodgate order of remote monitoring system is received, sends and closes
Lock instructs to transformer excitation flow restraining device and outputs module, completes closing operation by outputing module, gathers the position of the switch
Signal (position of the switch information when step S01 collection switches close a floodgate), and record is issued to position of the switch closure from reclosing command
Required time t；This step provides corrected parameter for the amendment of closing phase angle；
S02, switchs separating brake information record：Receive after remote control separating brake order, switch performs sub-switching operation, and records switch
From closing separating brake information when position is changed into point position, the position of the switch becomes timesharing triggering recording by closing, and main control module recording voltage is being switched
Conjugate the data of forward and backward each n cycle；Typically take the data of former and later two cycles；
S03, calculates separating brake moment voltage phase angle α：According to the separating brake information of step S02 records, through full wave Fourier algorithm
Phase angle α of the position of the switch by conjunction variation moment A phase voltages is calculated, three-phase voltage is symmetrical during due to separating brake, therefore need to only take A phases
Voltage, it is also same during combined floodgate；
S04, calculates the voltage phase angle β corresponding to switch combined floodgate triggering moment：The switch recorded according to step S01 closes a floodgate
Required time t, and (the step S03 position of the switch is by closing variation moment A by the last time separating brake phase angle α that step S03 is calculated
The phase angle α of phase voltage), the phase angle beta of combined floodgate triggering moment is calculated, to ensure the phase angle and last time separating brake that switch actual closing moment
Phase angle it is same or like：
This step has carried out actual correction to separating brake moment voltage phase angle α；T% 20 represents to take the remainder to 20, due to
One whole wave period is 20ms, and t% 20 is used to calculate the surplus after whole wave period；
S05, closes a floodgate and performs, when receiving remote control combined floodgate order, the phase angle of monitoring A phase voltages, and compare A phases in real time
When voltage phase angle is equal with the combined floodgate triggering phase angle beta that step S04 is calculated, reclosing command is sent to module is outputed, by opening
Go out module and complete closing operation；
Information when S06, recording step S05 close a floodgate during switch closure, then calculates switch closure through full wave Fourier algorithm
When A phase voltage phase angles γ；
S07, the latching logic that shoves adjustment：Latching logic adjustment of shoving is carried out according to surge suppression effect.
Specifically include following steps,
The differentiation of (7-a) surge suppression effect, is calculated according to actual closing phase angle in step S06 and step S03
The difference that separating brake phase angle is present, differentiates the effect of surge suppression；
When | γ-α | 30 ° of ＜, surge suppression effect level is judged to A grades；
When 30 °≤| γ-α | 60 ° of ＜, surge suppression effect level is judged to B grades；
When | γ-α | >=60 °, surge suppression effect level is judged to C grades；
(7-b) carries out the adjustment of latching logic of shoving according to surge suppression effect:Locking criterion of shoving includes secondary humorous
Ripple locking criterion and waveform symmetry locking criterion, according to the rank adjusting second harmonic locking of step (7-a) surge suppression effect
The syntagmatic of criterion and waveform symmetry locking criterion, when the rank of surge suppression effect is A grades, is closed using second harmonic
Lock and waveform symmetry locking and door locking, improve the sensitivity protected when high resistance ground and turn-to-turn fault in area；Work as surge suppression
When effect level is B grades, using second harmonic locking；When surge suppression effect level is C grades, using second harmonic locking
With both waveform symmetry lockings OR gate locking, it is ensured that the reliability of protection.
After step S07 terminates, that continues detection switch opens a sluice gate order, when receiving after opening a sluice gate order of switch, into step
Rapid S02, the latching logic adjustment that calculates and shove is suppressed into excitation surge current next time, can realize that transformer excitation flow presses down
The persistent loop of system and differential protection is acted on.
Technical scheme is not restricted in the range of embodiment of the present invention.The not detailed description of the present invention
Technology contents be known technology.
Claims (3)
1. a kind of self learning type differential protection malfunction device on traction substation transformer, it is characterised in that：Including master
Machine（1）, main frame（1）Front side set operation dish（6）, operation dish（6）Anterior block cover is set（5）, block cover（5）By a riser
With a transverse slat composition, transverse slat is located at the top of riser, block cover（5）Both sides are equipped with guide holder（7）, guide holder（7）Inner side
Open up and block cover（5）The guide groove that side coordinates（13）, guide holder（7）It is fixedly mounted on main frame（1）Shell on, guide holder
（7）Both sides be respectively provided with cup grease box（10）And elastomeric bladder（11）, cup grease box（10）Interior filling cup grease, cup grease box（10）
Outlet connection elastomeric bladder（11）One end, elastomeric bladder（11）The other end pass through connecting tube（12）Connect guide holder（7）On
Guide groove（13）, elastomeric bladder（11）Two ends be respectively provided with check valve（15）, elastomeric bladder（11）Top set fixed plate（14）, gear
Cover（5）Upper end both sides set connecting plate（16）, connecting plate（16）Upper installation and guide holder（7）Parallel pull bar（9）, pull bar
（9）Lower end set pressing plate（8）, pull bar（9）Through fixed plate（14）, block cover（5）Transverse slat on be equipped with screw mandrel（3）, silk
Bar（3）Upper end connection motor（2）, block cover（5）Upper setting startup button（4）, startup button（4）Controlled motor（2）Start and turn to,
Motor（2）, cup grease box（10）And fixed plate（14）It is installed in main frame（1）Shell on, described cup grease is with parts by weight
Meter, is consisted of the following composition：3-6 parts of aluminium hydroxide, 2-5 parts of magnesia, 15-25 parts of white oil, 5-8 parts of melamine, ethylene glycol
4-8 parts of ethyl ether acetate ester, 3-6 parts of pentaerythritol stearate, 8-12 parts of lanolin, 10-15 parts of ethylene glycol, super high molecular weight is gathered
20-25 parts of 5-8 parts of vinyl fiber, 15-20 parts of silicone oil and modified polyacetal powder；The modified polyacetal powder is according to lower section
Method is obtained：In parts by weight, by 100 parts of polyformaldehyde, 0.05-0.08 parts of 2,6- di-tert-butyl-4-methy phenols, carbamylurea
0.5-1 parts, 0.5-0.8 parts of calcium carbonate, mix in 5-15 parts of addition high-speed mixers of 5-10 parts of graphite and molybdenum disulfide, then with arranging
Gas formula double screw extruder is at 100-150 revs/min of screw speed, 190-230 DEG C of barrel temperature after melting mixing, extruding pelletization
Crushed with pulverizer, obtain the modified polyacetal powder that particle diameter is 1-5 μm, described main frame（1）Interior setting main control module（17）,
Main control module（17）PORT COM attended operation disk（6）, main control module（17）Respectively with difference current fast tripping protection circuit
（18）, differential protection circuit（19）, excitation surge current determining device（20）, overload locking regulating circuit（21）And warning circuit（22）Even
Connect.
2. a kind of self learning type differential protection malfunction dress on traction substation transformer according to claim 1
Put, it is characterised in that：Described cup grease in parts by weight, is consisted of the following composition：5 parts of aluminium hydroxide, 3 parts of magnesia, in vain
20 parts of oil, 6 parts of melamine, 5 parts of ethylene glycol ether acetate, 5 parts of pentaerythritol stearate, 10 parts of lanolin, ethylene glycol
12 parts, 5 parts of superhigh molecular weight polyethylene fibers, 22 parts of 18 parts of silicone oil and modified polyacetal powder；The modified polyacetal powder
Obtain in accordance with the following methods：In parts by weight, by 100 parts of polyformaldehyde, 0.06 part of 2,6- di-tert-butyl-4-methy phenols, amino
Mixed in 0.8 part of formyl urea, 0.6 part of calcium carbonate, 10 parts of addition high-speed mixers of 8 parts of graphite and molybdenum disulfide, then use exhaust
Double screw extruder uses pulverizer powder at 120 revs/min of screw speed, 200 DEG C of barrel temperature after melting mixing, extruding pelletization
It is broken, obtain the modified polyacetal powder that particle diameter is 3 μm.
3. a kind of self learning type differential protection malfunction dress on traction substation transformer according to claim 1
Put, it is characterised in that：Described cup grease is prepared using following methods：1. the preparation of modified polyacetal powder：With parts by weight
Meter, by 100 parts of polyformaldehyde, 0.05-0.08 parts of 2,6- di-tert-butyl-4-methy phenols, 0.5-1 parts of carbamylurea, calcium carbonate
0.5-0.8 parts, mix in 5-15 parts of addition high-speed mixers of 5-10 parts of graphite and molybdenum disulfide, then extruded with vented twin screw
Machine is crushed at 100-150 revs/min of screw speed, 190-230 DEG C of barrel temperature after melting mixing, extruding pelletization with pulverizer,
Obtain the modified polyacetal powder that particle diameter is 1-5 μm；2. the preparation of cup grease：In parts by weight, by 15-25 parts of white oil, second two
4-8 parts of alcohol ethyl ether acetate ester, 3-6 parts of pentaerythritol stearate, 8-12 parts of lanolin, 10-15 parts of ethylene glycol, super high molecular weight
5-8 parts of polyethylene fibre, 15-20 parts of silicone oil and step be 1. in gained 20-25 parts of addition reactors of modified polyacetal powder,
25-35 DEG C is cooled to after being stirred 1-3 hours at 100-150 DEG C, 3-6 parts of aluminium hydroxide, 2-5 parts of magnesia, melamine is added
5-8 parts of amine, stirs, is ground with colloid mill, obtains the cup grease of 1-5 μm of average grain diameter.
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| CN201510710614.3A CN105186453B (en) | 2015-10-28 | 2015-10-28 | A kind of self learning type differential protection malfunction device on traction substation transformer |
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| CN105186453B true CN105186453B (en) | 2017-10-10 |
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Citations (5)
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| JPS61175596U (en) * | 1981-01-23 | 1986-11-01 | ||
| CN104450101A (en) * | 2014-12-26 | 2015-03-25 | 无锡市飞天油脂有限公司 | Special lubricating oil for linear guide rail |
| CN104531303A (en) * | 2014-12-26 | 2015-04-22 | 无锡市飞天油脂有限公司 | Special lubricating grease for air compressor |
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| CN205070400U (en) * | 2015-10-28 | 2016-03-02 | 山东山大世纪科技有限公司 | A self -learning type differential protection misses and moves device for on traction substation transformer |
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2015
- 2015-10-28 CN CN201510710614.3A patent/CN105186453B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61175596U (en) * | 1981-01-23 | 1986-11-01 | ||
| CN104450101A (en) * | 2014-12-26 | 2015-03-25 | 无锡市飞天油脂有限公司 | Special lubricating oil for linear guide rail |
| CN104531303A (en) * | 2014-12-26 | 2015-04-22 | 无锡市飞天油脂有限公司 | Special lubricating grease for air compressor |
| CN204349425U (en) * | 2015-01-27 | 2015-05-20 | 张琦 | Multiple coil phase shifting transformer fiber differential protection device |
| CN205070400U (en) * | 2015-10-28 | 2016-03-02 | 山东山大世纪科技有限公司 | A self -learning type differential protection misses and moves device for on traction substation transformer |
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| 聚甲醛改性研究现状;刘莉等;《工程塑料应用》;20080210(第2期);71-75 * |
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