CN111580034A - Integrated current transformer temperature rise test system and test method - Google Patents
Integrated current transformer temperature rise test system and test method Download PDFInfo
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- CN111580034A CN111580034A CN202010400057.6A CN202010400057A CN111580034A CN 111580034 A CN111580034 A CN 111580034A CN 202010400057 A CN202010400057 A CN 202010400057A CN 111580034 A CN111580034 A CN 111580034A
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000010998 test method Methods 0.000 title abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 27
- 230000000630 rising effect Effects 0.000 claims abstract description 26
- 230000003993 interaction Effects 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 230000010259 detection of temperature stimulus Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 9
- 239000000523 sample Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides an integrated current transformer temperature rise test system and a test method, which are used for carrying out transformer temperature rise tests, wherein the transformer temperature rise test system comprises a temperature measurement unit, a direct resistance tester and a current rising unit; the temperature measuring unit is used for measuring the temperature of the tested current transformer; the direct resistance tester is used for measuring the resistance of a winding of the tested current transformer; the current rising unit is used for rising current on the tested current transformer to the target current. The test system and the test method can realize effective detection of temperature rise of the tested current transformer, and can realize real-time and stable transmission of data, timely generate a test report and provide test result feedback through communication between the direct current resistance tester, the multi-path temperature polling instrument and the operation terminal through the network port unit.
Description
Technical Field
The invention discloses an integrated current transformer temperature rise test system and a test method, and belongs to the technical field of transformer test.
Background
The performance of the current transformer for metering is good, the metering is accurate and is directly related to the safe and stable operation of a power system and the accuracy of power metering, and some problems in the design of the transformer, such as local overheating, transposition errors and the like, can be found through a temperature rise test of the transformer. At present, the temperature rise test of the mutual inductor mostly adopts a distributed and manual control mode to realize the test of the temperature and the winding resistance of the mutual inductor, and has the disadvantages of complex operation, long duration and large workload.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an integrated current transformer temperature rise test system and a test method thereof, so as to solve the problem of complex operation during a current transformer temperature rise test in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an integrated current transformer temperature rise test system comprises a temperature measuring unit, a direct resistance tester and a current rising unit;
the temperature measuring unit is used for measuring the temperature of the tested current transformer;
the direct resistance tester is used for measuring the resistance of a winding of the tested current transformer;
the current rising unit is used for rising current on the tested current transformer to the target current.
Further, the temperature measuring unit comprises a plurality of temperature polling instruments and thermometers which are interconnected.
Furthermore, the system also comprises an automatic control unit, a man-machine interaction unit, an alarm and a load box;
the automatic control unit is simultaneously connected with the direct resistance tester, the human-computer interaction unit, the upflow unit and the load box;
the human-computer interaction unit is simultaneously connected with the temperature measuring unit and the alarm.
Furthermore, the current rising unit comprises a voltage regulating control unit, a current rising device, a current transformer and an electric quantity sensor;
the voltage regulation control unit is connected with the current rising device, and the current transformer and the electric quantity sensor are electrically connected in sequence.
Further, the voltage regulation control unit comprises a main voltage regulation and regulation device and a fine voltage regulation and regulation device.
Further, the current booster is connected with the tested mutual inductor through a large-current lead.
Furthermore, the difference between the conductor temperature of the large-current lead at a position 0.75-1 m away from the primary current joint and the temperature of the current joint is not more than 3K.
An integrated current transformer temperature rise test testing method comprises the following steps:
acquiring an initial resistance value of a winding of a tested current transformer through a direct resistance tester;
measuring the initial average temperature of the tested current transformer through a temperature measuring unit;
the current transformer to be tested is subjected to current rising to a target current through a current rising unit, so that the current transformer to be tested reaches a thermal stable state;
after the thermal stability state is reached, cutting off the power supply and obtaining the power-off temperature of the tested current transformer and the average resistance value of the windings after power-off;
and calculating the temperature rise of the tested mutual inductor according to the initial resistance value, the initial average temperature, the average resistance value and the power-off temperature.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of firstly, measuring an initial resistance value of a current transformer winding before being electrified by using a direct resistance tester, then, electrifying the current transformer by a current rising unit to rise to a target current, enabling the temperature of the current transformer to reach a stable state, cutting off a power supply, immediately measuring the resistance of a coil, monitoring the temperature of each path of an environment, an iron core of the transformer, a primary conductor and the like in real time by using a temperature measuring unit, and obtaining test data according to the output data of the temperature measuring unit and the direct resistance tester; the corresponding temperature rise result is generated according to the test data, the system is simple to operate, real-time and stable transmission of the data can be realized, and the feedback of the test result is provided in time.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a wiring diagram for a temperature rise test of a current transformer;
FIG. 3 is a flow chart of the method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 2, an integrated temperature rise test system for a current transformer comprises a temperature measuring unit, a direct resistance tester, an up-flow unit, an automatic control unit, a human-computer interaction unit, an alarm and a load box;
the automatic control unit is simultaneously connected with the direct resistance tester, the human-computer interaction unit, the upflow unit and the load box; the man-machine interaction unit is simultaneously connected with the temperature measuring unit and the alarm, and transmits the temperature data measured by the temperature measuring unit to the man-machine interaction unit;
the temperature measuring unit is used for measuring the temperature of the tested current transformer; the direct resistance tester is used for measuring the resistance of a winding of the tested current transformer; the current rising unit is used for rising current on the tested current transformer to the target current.
The temperature measuring unit comprises a multi-path temperature polling instrument and a thermometer which are interconnected, and the thermometer is connected with a temperature probe of the multi-path temperature polling instrument through a temperature sensing line; the multi-channel temperature patrol instrument is provided with 16 channels and a temperature probe, and can be used for fully automatically patrolling the temperatures of the 16 channels and carrying out patrol display; three of said thermometers, the ambient temperature around the mutual inductor.
The current rising unit comprises a voltage regulating control unit, a current rising device, a current transformer and an electric quantity sensor;
the voltage regulating unit is connected with the current rising device, the current rising device is connected with the current transformer, and the current of the current transformer is collected and transmitted to the automatic control unit through the electric quantity sensor. The voltage regulating control unit comprises a main voltage regulating and regulating device and a fine voltage regulating and regulating device.
The alarm is connected with the human-computer interaction unit; the alarm sounds when the temperature changes less than 1K within 2 h.
The current booster is connected with a tested transformer through a large-current lead, and the length of the large-current lead is 2 meters;
the difference between the conductor temperature of the large-current lead at a position 0.75-1 m away from the primary current joint and the temperature of the current joint is not allowed to exceed 3K.
And the number of the direct current resistance testers is 2, and the direct current resistance testers are used for measuring the resistance of the primary winding and the secondary winding of the mutual inductor.
The load boxes are 4 current transformer load boxes, and the number of the load boxes can be selected according to the number of secondary windings of the tested transformer.
As shown in fig. 3, the integrated current transformer temperature rise test method is used for testing a current transformer to be tested, and the test method includes the following steps:
the method comprises the following steps: and respectively connecting the test wires of the direct resistance tester to the primary and secondary wiring terminals of the tested current transformer. And testing the initial resistance value of the winding of the tested current transformer.
Step two: measuring the initial average temperature of the tested current transformer through a temperature measuring unit;
step three: the tested current transformer is connected with the current booster for the first time, and is connected with the load box of the current transformer for the second time, and the current is boosted to the target current.
Step four: judging whether the tested current transformer achieves thermal stability or not according to the detected temperature and the temperature rise stability condition;
step five: after the temperature rise of the tested current transformer reaches thermal balance, cutting off a power supply to record the temperature during power failure, namely the power failure temperature;
step six: and calculating the average resistance value of the windings after the power failure by a semi-logarithmic coordinate graphical resistance method according to the resistance value measured every 30s after the power failure.
Step seven: and calculating the temperature rise of the tested current transformer by a resistance method according to the initial resistance value, the initial average temperature, the average resistance value and the power-off temperature.
The specific method comprises the following steps:
the method comprises the following steps: the primary side of the long-time large-current generating device is connected with the voltage regulating control box, the secondary side of the long-time large-current generating device is connected with the primary winding of the current transformer through a large-current lead, and the secondary winding of the current transformer is connected with the direct-current resistance tester or the program-controlled current load box;
step two: three thermometers were placed 1.5m around the current transformer under test, and the temperature surface temperatures of the transformer core, the primary conductor, other components, and the like were measured by temperature sensors. The ambient air temperature is kept in the range of 10-40 ℃, and the ambient temperature does not change more than 10K in the test process. Uniformly distributing thermometers around the tested sample, immersing the thermometers in a cup filled with transformer oil with the volume of not less than 1000mL, placing the thermometers at 1/2 of the height of the tested sample, and keeping the thermometers at a distance of 1.5m away from the tested sample, wherein the thermometers are guaranteed to be free from the influence of air flow and heat radiation;
step three: when the power supply is switched on, the primary winding and the secondary winding of the mutual inductor are respectively connected with a direct current resistance tester, and the initial values and the initial temperatures of the primary winding and the secondary winding are read;
step four: in the temperature rise test, the length of a single primary conductor is 2m, and the current density is not more than 5A/mm2. The difference between the conductor temperature and the current joint temperature at a position 0.75-1 m away from a primary current joint of the mutual inductor is measured through a multi-path temperature polling instrument to determine whether the difference exceeds 3K, and if the difference exceeds 3K, a proper large-current lead is replaced;
step five: automatically controlling the current booster to rise to a target test current required by a standard according to the rated current of the connected current transformer; continuously monitoring the temperature of the body of the current transformer, the temperature of a winding joint, the ambient temperature and other numerical values through a multi-path temperature polling instrument, and automatically judging whether the current transformer achieves thermal stability or not according to the measured temperature numerical value and the temperature rise stability condition required by the standard;
step six: and if the temperature rise value does not exceed 1K every 2 hours in the later period of the test, the temperature rise of each part of the sample is considered to be stable, and the sound alarm sounds after the temperature rise value is stable to remind testers of finishing the temperature rise of the test. After the temperature rise of the current transformer is stable, measuring the winding direct current resistance value of a coil of the current transformer by using a direct current resistance tester;
step seven: and calculating the temperature rise of the transformer by a semi-logarithmic coordinate graphical resistance method according to the winding resistance value after the temperature rise is stable, the highest temperature and the winding resistance direct current resistance value of the coil before the current rise.
The method comprises the steps of firstly, measuring the initial resistance value of a current transformer winding before being electrified by using a direct resistance tester, electrifying a primary winding of the current transformer by arranging a long-time large current generating device to nominally enlarge primary current until the temperature of a sample to be tested reaches a stable state, cutting off a power supply, and immediately measuring the resistance of a coil; the temperature of each path of environment, a transformer iron core, a primary conductor and the like is monitored in real time by utilizing a multi-path temperature polling instrument, test data is obtained according to data output by the multi-path temperature polling instrument and a direct current resistance tester, and the test data is sent to an operation platform terminal device by utilizing a network port communication unit. The terminal equipment can calculate and generate a corresponding test report according to the received test data. Therefore, the temperature rise of the tested current transformer can be effectively detected, the direct current resistance tester and the multi-path temperature polling instrument are communicated with the operation terminal through the network port unit, real-time and stable transmission of data can be realized, a test report can be generated in time, and test result feedback is provided.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An integrated current transformer temperature rise test system is characterized by comprising a temperature measuring unit, a direct resistance tester and a current rising unit;
the temperature measuring unit is used for measuring the temperature of the tested current transformer;
the direct resistance tester is used for measuring the resistance of a winding of the tested current transformer;
the current rising unit is used for rising current on the tested current transformer to the target current.
2. The integrated current transformer temperature rise test system according to claim 1, wherein the temperature measuring unit comprises a plurality of temperature polling instruments and thermometers which are interconnected.
3. The integrated current transformer temperature-rise test system according to claim 1, further comprising an automatic control unit, a man-machine interaction unit, an alarm and a load box;
the automatic control unit is simultaneously connected with the direct resistance tester, the human-computer interaction unit, the upflow unit and the load box;
the human-computer interaction unit is simultaneously connected with the temperature measuring unit and the alarm.
4. The integrated current transformer temperature rise test system according to claim 1, wherein the current rising unit comprises a voltage regulation control unit, a current rising device, a current transformer and an electric quantity sensor;
the voltage regulation control unit is connected with the current rising device, and the current transformer and the electric quantity sensor are electrically connected in sequence.
5. The integrated temperature rise test system for the current transformer according to claim 4, wherein the voltage regulation control unit comprises a main voltage regulation and regulation device and a fine voltage regulation and regulation device.
6. The integrated current transformer temperature-rise test system according to claim 4, wherein the current booster is connected with the tested transformer through a large-current lead.
7. The integrated current transformer temperature-rise test system according to claim 4, wherein the difference between the conductor temperature of the high-current lead at a distance of 0.75-1 m from the primary current joint and the temperature of the current joint is not more than 3K.
8. An integrated current transformer temperature rise test testing method is characterized by comprising the following steps:
acquiring an initial resistance value of a winding of a tested current transformer through a direct resistance tester;
measuring the initial average temperature of the tested current transformer through a temperature measuring unit;
the current transformer to be tested is subjected to current rising to a target current through a current rising unit, so that the current transformer to be tested reaches a thermal stable state;
after the thermal stability state is reached, cutting off the power supply and obtaining the power-off temperature of the tested current transformer and the average resistance value of the windings after power-off;
and calculating the temperature rise of the tested mutual inductor according to the initial resistance value, the initial average temperature, the average resistance value and the power-off temperature.
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| CN202010400057.6A CN111580034A (en) | 2020-05-13 | 2020-05-13 | Integrated current transformer temperature rise test system and test method |
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-
2020
- 2020-05-13 CN CN202010400057.6A patent/CN111580034A/en active Pending
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Application publication date: 20200825 |