CN108593706B - Nondestructive testing system for material of winding of distribution transformer with two-end heating - Google Patents
Nondestructive testing system for material of winding of distribution transformer with two-end heating Download PDFInfo
- Publication number
- CN108593706B CN108593706B CN201810482182.9A CN201810482182A CN108593706B CN 108593706 B CN108593706 B CN 108593706B CN 201810482182 A CN201810482182 A CN 201810482182A CN 108593706 B CN108593706 B CN 108593706B
- Authority
- CN
- China
- Prior art keywords
- heating
- conducting rod
- winding
- module
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 119
- 238000004804 winding Methods 0.000 title claims abstract description 98
- 239000000463 material Substances 0.000 title claims abstract description 59
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000010949 copper Substances 0.000 claims abstract description 65
- 229910052802 copper Inorganic materials 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 7
- 229910001006 Constantan Inorganic materials 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000004411 aluminium Substances 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 230000008901 benefit Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a nondestructive testing system for the material quality of a distribution transformer winding with two ends heated, which comprises: the detection device is connected with the first conducting rod and the second conducting rod through acquisition lines respectively; a first heating module is arranged on the first conducting rod; a second heating module is arranged on the second conducting rod; the detection device is also provided with a heating port, and the first heating module and the second heating module are connected with the heating port through heating wires; and two ends of the winding to be tested are respectively connected with the first conducting rod and the second conducting rod through the first copper bar connecting wire and the second copper bar connecting wire. The beneficial effects obtained by the invention are as follows: through heating simultaneously at winding both ends, and keep heating temperature the same, the thermoelectric potential error that produces in thermoelectric potential measuring line (fastener) place when having avoidd thermoelectric potential measurement, under the condition that does not damage distribution transformer winding, the accurate winding material of distinguishing is copper or aluminium.
Description
Technical Field
The invention relates to the technical field of distribution transformers, in particular to a nondestructive testing system for a winding material of a distribution transformer with two ends heated.
Background
Distribution transformers are made of copper materials as windings, which is a requirement of power companies and many power consumers, but some black-heart businesses do not have to pay attention to transformers made of aluminum windings in order to gain maximum benefit. Such "aluminum-substituted-copper" transformers cause power consumers to purchase aluminum wire transformers at the price of pure copper wire, but are counterfeit, and also suffer economic losses. On the other hand, the quality of the aluminum wire transformer produced by the manufacturer is difficult to guarantee, and potential safety hazards are brought.
In recent years, the existence of the aluminum winding distribution transformer is discovered in the process of selective inspection of the distribution transformer, but the existing equipment management department does not have a simple and quick means for judging the material of the distribution transformer, most of the materials of the winding are distinguished by hanging a cover or damaging the winding, and irreversible damage is caused to the distribution transformer. Therefore, the method for identifying the material of the transformer winding is feasible and has important practical significance and engineering value.
At present, the research at home and abroad is mainly used for nondestructive testing of dry-type distribution transformer winding materials in the following aspects:
the method comprises the steps of firstly, carrying out X-ray flaw detection and industrial radiographic film shooting on a transformer winding, comparing the shooting result with a normal copper winding transformer, and further determining the material of the winding, but the test method has high cost, large radiation to a human body and inconvenient field use;
the second detection method is to measure a time-resistance curve of the distribution transformer winding under a fixed current, and then compare the time-resistance curve with a copper time-resistance curve and an aluminum time-resistance curve, and specifically refer to the Chinese patent with application number 200810158124.7 named as transformer winding wire material tester and test method thereof, but the detection method has low accuracy when used on site and is greatly interfered by factors such as winding material, thickness and the like;
the third method is nondestructive testing of the material of the transformer winding based on the thermoelectric force, the method is high in reliability, and particularly, the method can refer to the Chinese utility model patent with the application number of 201620701836.9 named as intelligent diagnosis device for the material of the transformer winding, theoretical research of the method is accurate and reliable, but after the fact that the winding end is heated in the practical application process is found, a certain thermoelectric force can be generated between the end copper bar and the thermoelectric force measuring wire clamp, and the thermoelectric force at the winding connecting point cannot be accurately measured.
Based on the problems, the invention provides a nondestructive testing system for the material of a distribution transformer winding with two ends heated based on the thermoelectric principle, which can effectively solve the defect of application number 201620701836.9.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a nondestructive testing system for a distribution transformer winding with two heated ends, which avoids a thermoelectric potential error generated at a thermoelectric potential measuring line (wire clamp) during thermoelectric potential measurement by heating the two ends of the winding simultaneously and keeping the heating temperature the same, and can accurately distinguish the winding material without damaging the distribution transformer winding.
The invention aims to realize the technical scheme that the nondestructive testing system for the material of the distribution transformer winding with two ends heated comprises:
detection device, first conducting rod, second conducting rod and the winding that awaits measuring, its characterized in that: the detection device is respectively connected with the first conducting rod and the second conducting rod on the transformer through the acquisition line;
a first heating module is arranged on the first conducting rod; a second heating module is arranged on the second conducting rod;
the detection device is also provided with a heating port, and the first heating module and the second heating module are connected with the heating port through heating wires;
and two ends of the winding to be tested are respectively connected with the first conducting rod and the second conducting rod through the first copper bar connecting wire and the second copper bar connecting wire.
Further, the detection device comprises: the device comprises a processor, a temperature acquisition module, a thermoelectric force acquisition module, a heating control module and a material analysis module;
the temperature acquisition module respectively acquires temperature values of the first conducting rod and the second conducting rod, and the temperature values are marked as T1 and T2; the temperature acquisition module transmits the acquired temperature to the processor, and the processor sends a control instruction to the heating control module according to the received temperature value data;
thermoelectric potential collection module gathers the thermoelectric potential of transformer to transmit the thermoelectric potential who gathers to the treater, the treater carries out the judgement of winding material to material analysis module transmission after with thermoelectric potential data analysis processing that receives.
Further, the heating control module heats as follows:
s1: the processor presets a heating temperature T;
s2: temperature measuring points are preset at the first conducting rod and the second conducting rod respectively, and the processor sends heating instructions to the heating control module;
s3: the heating control module controls the first heating module and the second heating module to heat the first conducting rod and the second conducting rod respectively;
s4: detecting whether the temperature of the temperature measuring point is T +2 ℃; if so, stopping heating, otherwise, continuing heating;
s5: and detecting whether the temperature of the temperature measuring point is lower than T-2 ℃, if so, continuing heating, and otherwise, stopping heating.
Further, the method also comprises the following steps:
s6: after heating for 15min in step S4 or S5, measuring the thermoelectric voltage is started;
s7: and the material analysis module judges the material according to the measured thermoelectric potential data.
Furthermore, a first heating sheet is arranged in the first heating module, and a second heating sheet is arranged in the second heating module.
Further, the acquisition line comprises a first thermocouple loop and a second thermocouple loop;
the first thermocouple loop is respectively connected with the first conducting rod and the detection device;
the second thermocouple loop is respectively connected with the second conducting rod and the detection device;
the thermocouple loop consists of copper wire and constantan.
Furthermore, an aviation plug is further arranged on the detection device, and the first thermocouple loop and the second thermocouple loop are connected with the detection device through the aviation plug.
Further, the transformer may be an oil-immersed distribution transformer or a dry distribution transformer.
Further, the first conductive rod and the second conductive rod may be copper bars, and are not aluminum conductive rods.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the method can quickly and accurately measure the thermoelectric force generated at the joint of the heated winding and the high-temperature conducting rod (or copper bar).
(2) The accuracy of measurement is improved, get rid of thermoelectric potential collection line (or clip) and the copper bar material difference after the heating and produce the interference of thermoelectric potential.
(3) The invention is not only suitable for dry-type transformers, but also suitable for oil-immersed transformers, and avoids damage to the transformer winding in the test process, and the test method is simpler and more convenient.
(4) The invention is not only suitable for the low-voltage winding of the distribution transformer, but also suitable for the high-voltage winding of the distribution transformer.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a schematic connection diagram of a nondestructive testing system for the material of a winding of a distribution transformer with two ends heated.
FIG. 2 is a schematic view of a partial connection of a nondestructive testing system for a material of a winding of a distribution transformer with two ends heated.
FIG. 3 is a schematic view of the internal connections of the detection device.
Fig. 4 is a schematic view of the working process of the detection device.
FIG. 5 is a schematic flow chart of a nondestructive testing method for the material of a distribution transformer winding heated at two ends.
In the figure, 1 is a detection device; 2 is first thermoelectric potential measuring wire, 3 is first conducting rod, 4 is the second conducting rod, 5 is first heating module, 6 is the second heating module, 7 is the contact of the winding that awaits measuring and first conducting rod 3, 8 is the winding that awaits measuring, 9 is the contact of the winding that awaits measuring and second conducting rod 4, 10 is first copper bar connecting wire, 11 is second copper bar connecting wire, 12 is the second thermoelectric potential measuring wire, 13 is the second temperature measuring wire, 14 is the heater wire, 15 is the heating port, 16 is first temperature measuring wire, 17 is the aviation plug, 18 is the temperature measuring point.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example (b): as shown in fig. 1-4; the utility model provides a both ends heating distribution transformer winding material nondestructive test system, it is including:
the first conducting rod 3 is provided with a first heating module 5; a second heating module 6 is arranged on the second conducting rod 4;
the detection device 1 is also provided with a heating port 15, and the first heating module 5 and the second heating module 6 are connected with the heating port 15 through a heating wire 14;
two ends of the winding 8 to be tested are respectively connected with the first conducting rod 3 and the second conducting rod 4 through a first copper bar connecting wire 10 and a second copper bar connecting wire 11.
The detection device 1 comprises: the device comprises a processor, a temperature acquisition module, a thermoelectric force acquisition module, a heating control module and a material analysis module;
the temperature acquisition module respectively acquires temperature values of the first conducting rod 3 and the second conducting rod 4, and the temperature values are marked as T1 and T2; the temperature acquisition module transmits the acquired temperature to the processor, and the processor sends a control instruction to the heating control module according to the received temperature value data;
thermoelectric potential collection module gathers the thermoelectric potential of transformer to transmit the thermoelectric potential who gathers to the treater, the treater carries out the judgement of winding material to material analysis module transmission after with thermoelectric potential data analysis processing that receives.
The heating control module heats as follows:
s1: the processor presets a heating temperature T;
s2: temperature measuring points are preset at the first conducting rod 3 and the second conducting rod 4 respectively, and the processor sends heating instructions to the heating control module;
s3: the heating control module controls the first heating module 5 and the second heating module 6 to heat the first conducting rod 3 and the second conducting rod 4 respectively; the first heating module 5 is provided with a first heating sheet, and the second heating module 6 is provided with a second heating sheet. The conductive rod is heated by the heating plate.
S4: detecting whether the temperature of the temperature measuring point is T +2 ℃; if so, stopping heating, otherwise, continuing heating;
s5: and detecting whether the temperature of the temperature measuring point is lower than T-2 ℃, if so, continuing heating, and otherwise, stopping heating.
S6: after heating for 15min in step S4 or S5, measuring the thermoelectric voltage is started;
s7: and the material analysis module judges the material according to the measured thermoelectric potential data.
Wherein, the power supply for detection device 1 is 220V alternating current power supply, and heating temperature is set to be T after detection device 1 is started. The setting of T may be determined according to the insulation grade of the transformer, and is set to 100 ℃ in the present embodiment. When heating is started, the detection device 1 controls the two heating modules separately, and whether the two heating modules need to be heated or not is determined according to temperature values at T1 and T2 on the conducting rod (or the copper bar).
And the heating module heats the temperature at the temperature measuring point on the conductive rod (or the copper bar) to T +2 ℃, namely 102 ℃, and the heating is stopped. When the temperature at the temperature measuring point is lower than T-2 ℃, namely 98 ℃, the heating module continues to heat. Namely, the temperature at the measurement points T1 and T2 is stabilized at T + -2 ℃, and the temperature in the embodiment is stabilized between 98 ℃ and 102 ℃. When the temperatures of the two measuring points are stabilized at T +/-2 ℃, heating is continued for 15min, at the moment, heat is conducted to the joint 7 between the conducting rod (or the copper bar) and the winding along the conducting rod, thermoelectric potential measurement can be started, and material judgment is carried out according to measured values after the measurement is finished.
The detection device 1 of the invention consists of the following parts: the device comprises a processor, a temperature acquisition module, a thermoelectric force acquisition module, a heating control module and a material analysis module. The temperature acquisition module is mainly used for acquiring the temperatures of T1 and T2 positions on conducting rods (or copper bars) at two ends of the winding, transmitting the data to the processor, respectively controlling the heating of the two heating modules by the processor through the heating control module, and finally keeping the temperatures of T1 and T2 positions at temperature acquisition points at T +/-2 ℃. And keeping the temperature for 15min, starting the thermoelectric potential acquisition by the thermoelectric potential acquisition module, and judging the material according to the measured value.
The acquisition line comprises a first thermocouple loop and a second thermocouple loop;
the first thermocouple loop is respectively connected with the first conducting rod 3 and the detection device 1;
the second thermocouple loop is respectively connected with the second conducting rod 4 and the detection device 1;
the first thermocouple loop is formed by the first thermoelectric-voltage measuring wire 2 and the first temperature measuring wire 16, and the second thermocouple loop is formed by the second thermoelectric-voltage measuring wire 12 and the second temperature measuring wire 13. Wherein, the thermoelectric potential measuring line is a copper wire, and the temperature measuring line is constantan.
The measurement of the thermoelectric force is carried out by means of copper wires in the two groups of temperature measuring thermocouples, the copper wires and the constantan form a group of thermocouples, and the temperature on the heated conducting rod (or copper bar) can be tested. In the two groups of thermal point couples, two copper wires form a thermoelectric potential acquisition loop, and thermoelectric potential generated at the heated winding and the joint is measured. By adopting the measuring mode, the wiring is reduced, and the measurement is more convenient. However, because the temperatures of the two conductive rods (or copper bars) are not absolutely consistent, the temperature difference between the copper wire and the heated conductive rod (or copper bar) still exists, the temperature difference is at most 4 ℃, and the thermoelectric force of about 1 muV/k is generated between the copper wires made of different materials, so the measuring device can generate an error of about 4 muV, and the error value is small, so the error value can be ignored.
The detection device 1 is further provided with an aviation plug 17, and the first thermocouple loop and the second thermocouple loop are connected with the detection device 1 through the aviation plug 17.
The distribution transformer in the invention can be an oil-immersed distribution transformer or a dry distribution transformer.
The first conductive rod 3 and the second conductive rod 4 may be copper bars, and are not aluminum conductive rods.
As shown in fig. 5, a method for nondestructive testing of a material of a distribution transformer winding with two ends heated comprises the following steps:
s01: the winding 8 to be tested is connected with the first conducting rod 3 and the second conducting rod 4 through a first copper bar connecting wire 10 and a second copper bar connecting wire 11 respectively;
s02: a first heating module 5 and a second heating module 6 are respectively and fixedly arranged on the first conducting rod 3 and the second conducting rod 4;
s03: controlling the heating of the first heating module 5 and the second heating module 6 to make the first conducting rod 3 and the second conducting rod 4 heated uniformly;
s04: the thermoelectric potential measuring instrument 1 is connected with the first conducting rod 3 and the second conducting rod 4 through a first thermoelectric potential measuring line 2 and a second thermoelectric potential measuring line 12 respectively and collects thermoelectric potential Ev of the whole distribution transformer; in this embodiment, the thermoelectric-potential measuring instrument 1 is a microvolt meter. The first thermoelectric-voltage measuring wire 2 and the second thermoelectric-voltage measuring wire 12 can be measuring clamps.
S05: and detecting and judging the material of the winding to be detected according to the thermoelectric potential Ev collected by the thermoelectric potential measuring instrument 1.
In the testing process, the first heating module 5 and the second heating module 6 are respectively fixed on the first conducting rod (or copper bar) 3 and the second conducting rod (or copper bar) 4 of the winding 8 to be tested, and the heating of the two heating modules 5 and 6 is controlled, so that the temperatures of the contact parts of the first thermoelectric potential measuring line 2 and the second thermoelectric potential measuring line 12 and the two conducting rods (or copper bars) 3 and 4 are basically consistent.
After heating for a period of time, the heat is conducted to the winding 8 to be tested along the conducting rods (or copper bars) 3 and 4, and finally the temperature T at the two nodes 7 and 9 of the winding and the conducting rods (or copper bars) to be tested is caused due to the fact that the lengths of the first copper bar connecting wire 10 and the second copper bar connecting wire 11 at the two ends of the winding 8 to be tested are different3、T4And at the same time, the thermoelectric potential Ev collected by the thermoelectric potential tester 1 is the algebraic sum of the thermoelectric potential generated between the thermoelectric potential measuring line and the copper bar and the thermoelectric potential generated between the copper bar and the winding to be tested.
Step S05 further includes:
s051: according to the law of the intermediate conductor and the law of the intermediate temperature of the thermocouple, the thermoelectric potential Ev is decomposed as follows:
Ev=
+
+
+
；
wherein the content of the first and second substances,
indicating a thermoelectric potential generated between the first thermoelectric potential measurement line and the first conductive rod at a hot end temperature T1 and a cold end temperature T0;
s052: judging the relation between the temperature T1 and the temperature T2; when temperature T1= T2,
+
=0；
at this time:
Ev=
+
；
s053: calculating Seebeck coefficients of the winding 8 to be measured, the first conducting rod 3 and the second conducting rod 4 after thermoelectric potential decomposition; if the Seebeck coefficient is about 0.5 mu V/k, the winding to be detected is a copper winding; and if the Seebeck coefficient is not lower than 4 mu V/k, the winding to be detected is an aluminum winding.
When the copper bar connecting wire and the winding to be tested are different in material (namely the connecting wire is copper and the winding is aluminum),
and
the Seebeck coefficient of (A) is large, and is approximately 4. mu.V/K. The thermoelectric potential measuring wire and the winding are made of copper materials, so that the generated thermoelectric potential is small, and the numerical value of the Seebeck coefficient is smaller than 1 muV/K. The thermoelectric voltage Ev collected by the thermoelectric voltage tester 1 is mainly the thermoelectric voltage generated between the winding and the copper bar connecting wire (at positions T3 and T4).
The invention can accurately measure the thermoelectric force generated by the winding 8, the copper bars (or conducting rods) 3 and 4 and the connecting wires 10 and 11 after being heated: the measured Seebeck coefficient between different copper materials is about 0.5 mu V/k, and the Seebeck coefficient between copper and aluminum materials is not lower than 4 mu V/k.
The judgment of the step S05 also includes;
s0501: heating the first conducting rod 3 and the second conducting rod 4 to 130 ℃, wherein the temperature conducted to the joint to be detected is higher than 30 ℃;
s0502: the thermoelectric potential measuring instrument 1 starts to collect thermoelectric potential Ev, and if the collected thermoelectric potential Ev is less than 30 mu V, the winding to be measured is a copper winding; if the collected thermoelectric potential Ev is more than 120 μ V, the winding to be detected is an aluminum winding; if the collected thermoelectric voltage Ev is between 30 muV and 120 muV, the probability that the winding to be detected is made of aluminum is as follows:
the probability that the winding to be detected is made of copper is as follows:
。
the first conducting rod 3 and the second conducting rod 4 can be copper bars, and are not aluminum conducting rods or aluminum bars; since there is no copper bar between the aluminum as a reference measurement.
The invention is used by paying attention to the following points:
(1) the conductive rods (or copper bars) at the two ends of the winding are required to ensure that the temperatures of the two thermoelectric potential measuring wire clamps are basically equal in the heating process, and the temperature difference does not exceed 5 ℃.
(2) The lengths of the conducting rods (or copper bars) or the connecting wires at the two ends of the winding are different, so that after heating, the temperatures at the two connecting points at the two ends of the winding are different and have a certain temperature difference.
(3) The method is suitable for the low-voltage side and the high-voltage side of the oil-immersed distribution transformer and the low-voltage side of the dry-type distribution transformer, but when the high-voltage side of the dry-type distribution transformer is used, wires at two ends of a winding are detached, and two copper bars with different lengths are additionally connected.
Based on the thermoelectric principle, the invention simultaneously heats the conducting rods (or copper bars) at the two ends of the transformer winding and keeps the temperature of the clamp parts of the two thermoelectric potential measuring wires consistent, the thermoelectric potentials generated between the thermoelectric potential measuring wires at the two ends and the conducting rods (or copper bars) due to different materials are mutually counteracted, and the material of the winding is judged according to the measured thermoelectric potentials at the two ends of the heated winding, namely the thermoelectric potential generated at the joints of the heated winding and the conducting rods (or copper bars).
It should be understood that parts of the specification not set forth in detail are well within the prior art. Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a both ends heating distribution transformer winding material nondestructive test system, includes detection device (1), first conducting rod (3), second conducting rod (4) and winding (8) that await measuring, its characterized in that: the detection device (1) is respectively connected with a first conducting rod (3) and a second conducting rod (4) on the transformer through acquisition lines;
a first heating module (5) is arranged on the first conducting rod (3); a second heating module (6) is arranged on the second conducting rod (4);
the detection device (1) is also provided with a heating port (15), and the first heating module (5) and the second heating module (6) are connected with the heating port (15) through heating wires (14);
two ends of a winding (8) to be tested are respectively connected with the first conducting rod (3) and the second conducting rod (4) through a first copper bar connecting wire (10) and a second copper bar connecting wire (11);
the first copper bar connecting line (10) and the second copper bar connecting line (11) are different in length.
2. The system for the nondestructive testing of the material of a distribution transformer winding heated at both ends according to claim 1, wherein the testing device (1) comprises: the device comprises a processor, a temperature acquisition module, a thermoelectric force acquisition module, a heating control module and a material analysis module;
the temperature acquisition module respectively acquires temperature values of the first conducting rod (3) and the second conducting rod (4) and marks of the temperature values are T1 and T2; the temperature acquisition module transmits the acquired temperature to the processor, and the processor sends a control instruction to the heating control module according to the received temperature value data;
thermoelectric potential collection module gathers transformer winding's thermoelectric potential to transmit the thermoelectric potential who gathers to the treater, the treater transmits the judgement that the winding material was carried out to material analysis module after with thermoelectric potential data analysis processing that receives.
3. The system for nondestructive testing of a distribution transformer winding material heated at both ends according to claim 2 wherein said heating control module is adapted to perform the following heating process:
s1: the processor presets a heating temperature T;
s2: temperature measuring points are preset at the first conducting rod (3) and the second conducting rod (4) respectively, and the processor sends heating instructions to the heating control module;
s3: the heating control module controls the first heating module (5) and the second heating module (6) to heat the first conducting rod (3) and the second conducting rod (4) respectively;
s4: when the temperature of the temperature measuring point reaches T, stopping heating, and then controlling the heating module to keep the temperature within the range of T-2-T +2 ℃.
4. The nondestructive testing system for the material of a distribution transformer winding heated at both ends according to claim 3 further comprising:
s5: after heating for 15min in step S4, measuring the thermoelectric potential is started;
s6: and the material analysis module judges the material according to the measured thermoelectric potential data.
5. The nondestructive testing system for the winding material of a distribution transformer heated at two ends as set forth in claim 1, wherein a first heating plate is disposed in said first heating module (5), and a second heating plate is disposed in said second heating module (6).
6. The system for nondestructive testing of a distribution transformer winding material heated at both ends of claim 1 wherein said collection wire comprises a first thermocouple loop and a second thermocouple loop;
the first thermocouple loop is respectively connected with the first conducting rod (3) and the detection device (1);
the second thermocouple loop is respectively connected with the second conducting rod (4) and the detection device (1);
the thermocouple loop consists of copper wire and constantan.
7. The non-destructive testing system for the winding material of the distribution transformer heated at two ends according to claim 6, wherein an aviation plug (17) is further disposed on the testing device (1), and the first thermocouple loop and the second thermocouple loop are connected to the testing device (1) through the aviation plug (17).
8. The nondestructive testing system for the winding material of a distribution transformer heated at two ends according to claim 2, wherein the transformer is an oil-immersed distribution transformer or a dry distribution transformer.
9. The nondestructive testing system for the winding material of a distribution transformer heated at two ends as set forth in claim 1, wherein the first conductive rod (3) and the second conductive rod (4) are copper bars and are not aluminum conductive rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810482182.9A CN108593706B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing system for material of winding of distribution transformer with two-end heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810482182.9A CN108593706B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing system for material of winding of distribution transformer with two-end heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108593706A CN108593706A (en) | 2018-09-28 |
| CN108593706B true CN108593706B (en) | 2020-11-10 |
Family
ID=63631858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810482182.9A Active CN108593706B (en) | 2018-05-18 | 2018-05-18 | Nondestructive testing system for material of winding of distribution transformer with two-end heating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108593706B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982579B (en) * | 2018-05-18 | 2021-02-26 | 国网重庆市电力公司电力科学研究院 | Nondestructive testing clamp for material of oil-immersed distribution transformer winding |
| CN113884778B (en) * | 2021-10-29 | 2024-04-05 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
| CN115598166B (en) * | 2022-10-09 | 2023-10-13 | 国网山东省电力公司临沂供电公司 | Rapid nondestructive detection method for material of transformer coil |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202321726U (en) * | 2011-11-15 | 2012-07-11 | 广东百顺纸品有限公司 | Material coil with easy-to-identify tail end |
| CN103257160B (en) * | 2013-04-24 | 2015-06-03 | 华中科技大学 | Method for detecting winding material of three-phase winding device based on thermocouple principle |
| JP2015012224A (en) * | 2013-07-01 | 2015-01-19 | 三菱電機株式会社 | Zero-phase current transformer |
| CN104677927B (en) * | 2015-03-10 | 2017-12-01 | 国网四川省电力公司电力科学研究院 | Distribution transformer winding wood properly test system and method |
| CN104977324A (en) * | 2015-07-28 | 2015-10-14 | 国网浙江省电力公司电力科学研究院 | Method for identifying material of transformer winding |
| CN105223329B (en) * | 2015-09-18 | 2017-08-08 | 重庆大学 | Transformer Winding material discrimination method based on pyroelectric effect |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
| CN107192738B (en) * | 2017-07-19 | 2020-08-18 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting material of distribution transformer winding |
| CN107655941B (en) * | 2017-09-18 | 2020-06-19 | 国网重庆市电力公司电力科学研究院 | Transformer winding material detection method |
| CN107843707A (en) * | 2017-11-01 | 2018-03-27 | 重庆大学 | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences |
-
2018
- 2018-05-18 CN CN201810482182.9A patent/CN108593706B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108593706A (en) | 2018-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107655940B (en) | Transformer winding material detection equipment and system | |
| CN108593706B (en) | Nondestructive testing system for material of winding of distribution transformer with two-end heating | |
| CN104677927B (en) | Distribution transformer winding wood properly test system and method | |
| CN105973934A (en) | Intelligent diagnosis device and method for transformer winding material | |
| JP2001141683A (en) | Method and apparatus for monitoring crack | |
| CN105092660A (en) | Transformer winding material identification method based on resistance temperature coefficient | |
| CN107843618A (en) | Consider the distribution transformer winding material discrimination device and method that conducting rod material influences | |
| CN108680598B (en) | Nondestructive testing method for material of distribution transformer winding with two ends heated | |
| CN106597104A (en) | Device for detecting insulation resistance value of electric wire, and detection method thereof | |
| CN107655941B (en) | Transformer winding material detection method | |
| CN109324079B (en) | Material thermal expansion coefficient measuring method based on ultrasound | |
| CN204514832U (en) | Substation transformer winding wood properly test system | |
| CN108519158B (en) | A kind of infrared detection method of GIS device over-heat inside defect | |
| CN108680601B (en) | Nondestructive testing clamp for winding material of dry-type distribution transformer | |
| CN107843707A (en) | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences | |
| CN208296987U (en) | GIS device inner heat condition test system based on infrared imaging | |
| CN109580708A (en) | The voltage measurement method of the hot physical property of heat-pole method instantaneous measurement material | |
| CN106679818B (en) | Device and method for measuring temperature distribution of smooth surface | |
| CN106092763A (en) | Detection method based on cable insulating high temperature resistant sheath pressure | |
| CN206648685U (en) | A kind of heating cushion combined test stand | |
| CN209264821U (en) | A kind of Portable insulation material surface conductivity measuring apparatus | |
| RU2467338C1 (en) | Method to monitor technical condition of current-conducting parts in electrical equipment | |
| CN204479213U (en) | Thermocouple detection device | |
| CN111913127A (en) | Intelligent detection device and method for tubular bus | |
| CN206671257U (en) | A kind of alternating magnetic field magneto-optic imaging detection device and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |