CN116381384A - Distribution transformer capacity online measurement method, system, device and storage medium - Google Patents
Distribution transformer capacity online measurement method, system, device and storage medium Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
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Abstract
The invention provides a distribution transformer capacity online measurement method, a system, a device and a storage medium. The scheme can match the model and the capacity of the transformer under the condition of no power failure or voltage load for the running transformer, avoids contradiction and dispute with clients, recovers the electric charge in time, can simplify the workload of manual operation and maintenance, reduces the cost of power supply equipment, improves the investment income ratio, simultaneously definitely determines specific implementation modes, simplifies calculation and improves the accuracy of the capacity judgment of the transformer.
Description
Technical Field
The invention relates to the technical field of transformer capacity measurement, in particular to a method, a system, a device and a storage medium for online real-time measurement of the capacity of a distribution transformer without power outage.
Background
The power system is a complete process from power generation, transmission and distribution to power consumption, wherein a transformer plays an important role in the complete power system and is a heart of a power grid, and the transformer can realize voltage conversion and energy transmission. With the expansion of the scale of the distribution network, the use of the large-capacity distribution transformer is increased faster, and the load of the network can be quickly released. In the current distribution power grid, because power enterprises with power loads of 315KVA and above need to pay basic power fees (standard: 30 yuan/KVA month) each month, individual production enterprises carry out private modification on distribution transformer nameplates and delivery reports so as to achieve the purpose of paying less basic power fees, and a plurality of cases of the conditions are found in recent years. When a power supply company performs electricity inspection work in daily work, if a suspicious phenomenon that a customer changes the capacity of a transformer in a distribution mode privately is found, the customer always refuses to temporarily pause inspection on the transformer by virtue of various reasons such as urgent order task, and the like, until the customer notifies an electricity inspection person to perform on-site inspection, the customer replaces the iron core and the coil of the transformer with corresponding capacities on a nameplate, then the problem cannot be found in time by doing a transformer capacity detection test again, and reputation correction in the work of the power supply company can be generated.
As disclosed in patent document CN102393494a, an online measurement method and system for transformer capacity are disclosed, wherein the relationship between the transformer short-circuit impedance and the primary side voltage and secondary side voltage is deduced by analyzing the equivalent circuit model of the transformer, and the high-voltage side voltage is replaced by an ideal ac power signal according to the characteristic that the high-voltage side voltage hardly changes with the load when the transformer is operating normally; and then simply calculating the acquired secondary side voltage, current signals and ideal power supply signals, further linearly fitting the signals obtained by the calculation, obtaining the short-circuit impedance of the transformer to be tested, and finally calculating the real capacity of the transformer to be tested by using a short-circuit impedance method.
However, the measurement method and the system are not realized by corresponding circuit system structures, and a distribution transformer capacity online evaluation method is disclosed in a patent document with the publication number of CN108303606B, and the method adopts a correlation coefficient method to realize automatic identification of the connection group of the distribution transformer; further calculating the short-circuit impedance of the Dyn11 distribution transformer and the zero-sequence impedance of the Yyn0 distribution transformer, and comparing the short-circuit impedance with a standard reference value; and finally obtaining the estimated capacity of the distribution transformer. According to the running voltage data of the distribution transformer, a correlation coefficient method is applied to realize the self-identification of the connection group of the distribution transformer; according to the invention, under the condition that the primary side electric quantity of the distribution transformer cannot be acquired, the rated capacity of the distribution transformer can be accurately estimated by the Dyn11 distribution transformer capacity on-line estimation method; according to the invention, under the condition that the neutral point of the Yyn0 distribution transformer can deviate, the rated capacity of the distribution transformer can be accurately estimated by the Yyn0 distribution transformer capacity on-line estimation method. However, the calculation of the vector and the matrix in the method greatly increases the calculation amount and the complexity, and in addition, the influence of the temperature on the calculation result is not considered, so that the judgment of the capacity of the distribution transformer is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a distribution transformer capacity online measurement method, a distribution transformer capacity online measurement system, a distribution transformer capacity online measurement device and a distribution transformer capacity online measurement storage medium, so as to solve the problems of ambiguous specific implementation, complex calculation and insufficient capacity judgment accuracy.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
an online measurement method for the capacity of a distribution transformer comprises the following steps:
three-phase current at the high-voltage side of the distribution transformer is sent to a first electric quantity sensor through a clamp-shaped current sensor to obtain a current signal at the secondary side of a high-voltage current transformer, three-phase voltage at the high-voltage side of the distribution transformer is sent to the first electric quantity sensor through a voltage signal at the secondary side of a voltage transformer on a high-voltage side bus, three-phase current at the low-voltage side of the distribution transformer is sent to a second electric quantity sensor through the clamp-shaped current sensor to obtain a current signal at the secondary side of the low-voltage current transformer, three-phase voltage at the low-voltage side of the distribution transformer is sent to the second electric quantity sensor through a low-voltage side bus, meanwhile, phase voltage is supplied to each module of an instrument through a power adapter, the first electric quantity sensor and the second electric quantity sensor are respectively connected to a PLC programmable controller, and an ambient temperature sensor and a transformer oil temperature sensor are respectively connected to the PLC programmable controller;
inputting known parameters of the distribution transformer through the touch display module;
measuring various data of the distribution transformer in real time through the first electric quantity sensor and the second electric quantity sensor;
the first electric quantity sensor and the second electric quantity sensor transmit the integrated measurement data to a PLC programmable controller;
the PLC performs public calculation through the acquired measurement data and known parameters of the distribution transformer;
the PLC obtains the corresponding actual capacity value of the distribution transformer according to the calculated numerical range in the numerical matching parameter table;
and the PLC displays the acquired data, the measurement result and the calculation result on the touch display module.
Preferably, before the PLC programmable controller performs the public calculation according to the acquired measurement data and the known parameters of the distribution transformer, the PLC programmable controller further includes a step of verifying the correctness of the wiring and device measurement:
calculating the active power of the high-voltage side:
and the actual power P 1 And (5) comparing the correctness.
Calculating the active power of the low-voltage side:
and the actual power P 2 And (5) comparing the correctness.
Calculating reactive power of a high-voltage side:
and the actual measured power Q 1 And (5) comparing the correctness.
Calculating reactive power of the low-voltage side:
and the actual measured power Q 2 And (5) comparing the correctness.
The actual measurement of the high side and the low side of the distribution transformer is compared with the calculated active power and reactive power, so that the device and the wiring are ensured to be correct, and accurate data analysis is achieved. .
Preferably, the step of performing the public calculation by the PLC programmable controller (1) through the acquired measurement data and the parameters known by the distribution transformer (5) includes the following steps:
calculating the oil temperature T according to the formula (1) 2 The sum of transformer dielectric loss power under current load
①P △T2℃ ＝P 1 -P 2
Calculating the oil temperature T according to the formula (2) 2 The sum of the dielectric loss power when the load is converted to full load
②P Full at DeltaT 2 DEG C ＝(S N /S 1 ) 2 *P △T2℃ Wherein S is N Transforming rated capacity for distribution
P is calculated according to formula (3) Full at DeltaT 2 DEG C Dielectric loss power P converted into ambient temperature of 75 DEG C △75℃
③P △75℃ ＝KP Full at DeltaT 2 DEG C Wherein K is a temperature conversion coefficient:
when the transformer is a copper coil: k= (235+75)/(235+t) 1 )
When the transformer is an aluminum coil: k= (225+75)/(225+t) 1 )
Wherein T is 1 Room temperature acquired for an ambient temperature sensor;
calculating reactive power difference between high-voltage side and low-voltage side of transformer according to formula (4)
④Q △ ＝|Q 1 -Q 2 |
On-line calculating the no-load current of the transformer according to formula (5)
⑤
The PLC (1) is used for matching the numerical range in the parameter table according to the calculated numerical value, wherein the matching basis is P △75℃ And I 0。
Preferably, three clamp-on current sensors are used for the high-voltage side and the low-voltage side.
Preferably, the power adapter is a power adapter converting 220V ac to 24V dc.
Preferably, the touch display module uses a GOT embedded graphic operation terminal.
Preferably, the first electric quantity sensor and the second electric quantity sensor transmit the integrated measurement data to the PLC by using a Modbus protocol through an RS485 communication interface.
Based on the same conception, the invention also provides a distribution transformer capacity online measurement system which is used for realizing the distribution transformer capacity online measurement method, and comprises a high-voltage current transformer, a clamp-on current sensor, a high-voltage current transformer, an environment temperature sensor, a transformer oil temperature sensor, a first electric quantity sensor, a second electric quantity sensor, a PLC programmable controller and a touch display module, wherein the PLC programmable controller is electrically connected with the touch display module, and the environment temperature sensor, the transformer oil temperature sensor, the first electric quantity sensor and the second electric quantity sensor are respectively electrically connected with the PLC programmable controller; the power distribution system comprises a power distribution transformer, a power distribution controller, a clamp-shaped current sensor, a PLC (programmable logic controller) and a touch display module, wherein the clamp-shaped current sensor is respectively arranged on the secondary load sides of the power distribution transformer and is respectively electrically connected with the first power sensor and the second power sensor, the voltage transformer is arranged on a high-voltage side bus, the secondary side of the voltage transformer is electrically connected with the first power sensor, the low-voltage side bus is electrically connected with the second power sensor, the touch display module is used for inputting known parameters of the power distribution transformer and displaying acquired data, measurement results and calculation results, and the PLC is used for carrying out public calculation on the acquired measurement data and the known parameters of the power distribution transformer, obtaining the actual capacity value of the corresponding power distribution transformer according to the calculated numerical range in a numerical value matching parameter table and sending the acquired data, the measurement results and calculation results to the touch display module for display.
Based on the same inventive concept, the invention also provides a device for online measurement of the capacity of the distribution transformer, which comprises a PLC programmable controller, a memory and a processor, wherein the memory is used for storing a computer program; the processor is used for realizing the online measurement method of the capacity of the distribution transformer when executing the computer program.
Based on the same inventive concept, the present invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the aforementioned distribution transformer capacity online measurement method.
The invention takes the electrical variable and environmental influence factors of the transformer into consideration, calculates (matches) the actual capacity value of the transformer by utilizing the operation data value of the online transformer, can enable staff to rapidly detect the actual capacity of the distribution transformer of a customer on a power supply site, find out the condition that the capacity of the distribution transformer is inconsistent with a nameplate, and immediately requires the parameters such as copper, iron loss and the like of the distribution transformer to be tested by power failure to be compared with the factory data of the transformer, thereby achieving the purpose of checking the actual capacity of the distribution transformer, and taking the parameters as a certificate to enable the customer to sign the actual capacity of the transformer so as to timely recover basic electricity charge according to marketing programs.
When the actual capacity of the customer transformer and the nameplate capacity are suspected to have problems, the parameters such as the loss of the distribution transformer and the like are measured on line by the invention and then are matched with the related parameters (the parameters can also be matched with the factory parameters of the transformer) of each type of capacity transformer, so that the actual capacity of the transformer is analyzed and estimated. After analysis and estimation, if the transformer is found to have problems and the customer does not acknowledge, the customer can be required to immediately power-off to test parameters such as copper and iron loss of the distribution transformer and compare the parameters with the factory data of the transformer, thereby achieving the purpose of checking the actual capacity of the distribution transformer.
Table 1 example of calculation of measured data for capacity matching using the present scheme
| Actual measurement of no-load current I 0 | Sum of measured losses P △75℃ | Matched transformer capacity |
| 0.364 | 8.619 | 800 |
| 0.316 | 8.859 | 800 |
| 0.257 | 8.417 | 800 |
| 0.418 | 7.512 | 630 |
| 0.689 | 7.538 | 630 |
| 0.778 | 7.478 | 630 |
| 0.381 | 5.896 | 500 |
| 0.531 | 6.137 | 500 |
| 0.479 | 6.239 | 500 |
The online measurement technology for the capacity of the distribution transformer is extremely high in prediction accuracy, can measure the capacity in real time under the condition that the transformer is not shut down, avoids power failure during measurement, can calculate the actual capacity of the transformer by more accurate measurement under the condition of considering the temperature of the oil and the temperature of the oil, is simple and easy to understand, greatly simplifies the original calculation process, and obtains the calculation result of equipment in real time without waiting for a long time.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of the present invention;
FIG. 2 is a flow chart illustrating a process of a PLC according to an embodiment of the present invention;
the system comprises a 1-PLC programmable controller, a 2-touch display module, a 3-first electric quantity sensor, a 4-second electric quantity sensor, a 5-distribution transformer, a 6-high-voltage current transformer, a 7-high-voltage current transformer, an 8-high-voltage side bus, a 9-low-voltage side bus, a 10-secondary load, an 11-clamp-shaped current sensor, a 12-high-voltage transformer and a 13-power adapter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
The embodiment provides a technical scheme that: considering variable parameters and environmental influence factors in the operation of the transformer, based on a PLC trapezoidal language and an embedded MCGS configuration screen language, the method for calculating the capacity of the distribution transformer based on the online is realized, and the related signals of the distribution transformer 5 are acquired: the high-voltage side voltage takes three-phase voltage of the secondary side of the high-voltage transformer 12, and three clamp-on current sensors 11 are used for taking three-phase current; the low-voltage side voltage takes three-phase voltage on the low-voltage side bus 9, and three clamp-on current sensors 11 are used for current to take three-phase current; the temperature is measured by using two thermocouples as an ambient temperature sensor and a transformer oil temperature sensor and the temperature of the transformer is measured by using a temperature sensor and a temperature sensor. The method of the embodiment specifically comprises the following steps:
the measuring system is connected to the distribution transformer 5, various parameters on the nameplate of the distribution transformer 5 are input from the touch display module 2, and various data of the measured transformer are measured in real time, wherein the data comprise high-voltage side three-phase voltage U 1 Three-phase current I at high voltage side 1 Apparent workRate S 1 Active power P 1 Reactive power Q 1 High-side power factor cos phi 1 Three-phase voltage U at low voltage side 2 Low-side three-phase current I 2 Apparent power S 2 Active power P 2 Reactive power Q 2 Low-side power factor cos phi 2 Ambient temperature T at the time of measurement 1 Temperature T of transformer 2 And obtaining various operation parameters and environment variables of the distribution transformer 5, wherein the electric quantity sensor in the measurement system comprises a first electric quantity sensor 3 and a 2 nd electric quantity sensor 4 which are connected with the sensors through a Modbus protocol and integrate measurement data.
And transmitting the integrated measurement data to the PLC 1 through an RS485 communication interface, and performing the following formula calculation.
High side active power:
and the actual power P 1 And (5) comparing the correctness.
Low side active power:
and the actual power P 2 And (5) comparing the correctness.
High-side reactive power:
and the actual measured power Q 1 And (5) comparing the correctness.
Low-side reactive power:
and the actual measured power Q 2 And (5) comparing the correctness.
The actual measurement of the high side and the low side of the distribution transformer is compared with the calculated active power and reactive power, the correctness of wiring and device measurement is verified, and the correctness of the device and wiring is ensured so as to accurately analyze data.
Oil temperature T 2 The dielectric loss of the distribution transformer 5, namely copper loss work under the current loadSum of rate and core loss power:
①P △T2℃ ＝P 1 -P 2
②P full at DeltaT 2 DEG C ＝(S N /S 1 ) 2 *P △T2℃ ，S N Rated capacity is transformed for distribution.
Equation (2) is the copper core loss when the load at the current oil temperature is converted to the full load. Copper loss is proportional to the square of the current.
Will P Full at DeltaT 2 DEG C Converted into dielectric loss, namely copper iron loss power P with the ambient temperature of 75 DEG C △75℃ ：
③P △75℃ ＝K P Full at DeltaT 2 DEG C
K is a temperature conversion coefficient:
when the transformer is a copper coil: k= (235+75)/(235+t) 1 )
When the transformer is an aluminum coil: k= (225+75)/(225+t) 1 )
The copper core loss power of the transformer calculated on line in the formula (3) can be used as a basis for judging the capacity of the distribution transformer 5.
Calculating the reactive power difference between the high voltage side and the low voltage side of the distribution transformer 5: (4) q (Q) △ ＝|Q 1 -Q 2 |
Calculating the distribution transformer 5 calculates the no-load current on line: (5)
the no-load current I calculated by the formula (5) 0 As a basis for judging the capacity of the distribution transformer 5, the model number of the transformer is judged;
to the measured I 0 、P △75℃ The closest value in the matching parameter table is calculated by the module, so that the corresponding actual capacity value of the transformer is matched. The capacity matching parameters used in this example are shown in table 2.
Table 2 distribution transformer capacity match parameter table
The numerical range of the table depends on the parameters of the model of the existing distribution transformer 5
And displaying the acquired data, the measurement result, the factory data of the transformer and the matched transformer capacity on a GOT embedded screen.
Based on the same inventive concept, an embodiment of the present invention further provides an online measurement system for capacity of a distribution transformer, which is configured to implement the foregoing online measurement method for capacity of a distribution transformer, where the online measurement system includes a high-voltage current transformer 6, a low-voltage current transformer 7, a pincer-shaped current sensor 11, a high-voltage transformer 12, and further includes an ambient temperature sensor, a transformer oil temperature sensor, a first electric quantity sensor 3, a second electric quantity sensor 4, a PLC programmable controller 1, and a touch display module 2, where the PLC programmable controller 1 and the touch display module 2 are electrically connected, and the ambient temperature sensor, the transformer oil temperature sensor, the first electric quantity sensor 3, and the second electric quantity sensor 4 are electrically connected to the PLC programmable controller 1 respectively; the clamp-on current sensor 11 is respectively installed on the secondary load 10 side of the high-voltage current transformer 6 and the secondary load 10 side of the low-voltage current transformer 7 and is respectively electrically connected with the first electric quantity sensor 3 and the second electric quantity sensor 4, the voltage transformer 12 is installed on the high-voltage side bus 8 and the secondary side of the voltage transformer is electrically connected with the first electric quantity sensor 3, the low-voltage side bus 9 is electrically connected with the second electric quantity sensor 4, the touch display module 2 is used for inputting known parameters of the distribution transformer 5 and displaying acquired data, measurement results and calculation results, and the PLC (programmable logic controller) 1 is used for carrying out public calculation on the acquired measurement data and the known parameters of the distribution transformer 5, obtaining the actual capacity value of the corresponding distribution transformer according to the calculated numerical value range in the numerical value matching parameter table and sending the acquired data, the measurement results and the calculation results to the touch display module 2 for display.
The phase voltage of the system is supplied to each module of the measurement system through the power adapter 13, the power adapter 13 uses a power adapter for converting alternating current 220V into direct current 24V, the touch display module 2 uses a GOT embedded graphic operation terminal, in the embodiment, a Mitsubishi GOT embedded graphic operation terminal is used, and the first electric quantity sensor 3 and the second electric quantity sensor 4 transmit integrated measurement data to the PLC 1 through an RS485 communication interface by using a Modbus protocol.
Based on the same inventive concept, an embodiment of the present invention further provides an apparatus for online measurement of capacity of a distribution transformer, including a PLC programmable controller 1, including a memory and a processor, where the memory is configured to store a computer program; the processor is used for realizing the distribution transformer capacity online measurement method when executing the computer program.
Based on the same inventive concept, an embodiment of the present invention further provides a computer readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the foregoing distribution transformer capacity online measurement method is implemented
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The online capacity measurement method for the distribution transformer is characterized by comprising the following steps of:
three-phase current at the high-voltage side of the distribution transformer (5) is sent to the first electric quantity sensor (3) through a clamp-on current sensor (11) to obtain a current signal at the secondary side of the high-voltage transformer (6), three-phase voltage at the high-voltage side of the distribution transformer (5) is sent to the first electric quantity sensor (3) through a voltage transformer (12) on a high-voltage side bus (8), three-phase current at the low-voltage side of the distribution transformer (5) is sent to the second electric quantity sensor (4) through a clamp-on current sensor (11) to obtain a current signal at the secondary side of the current transformer (7), three-phase voltage at the low-voltage side of the distribution transformer (5) is sent to the second electric quantity sensor (4) through a low-voltage side bus (9), meanwhile, the phase voltage is supplied to each module of the system through a power adapter (13), the first electric quantity sensor (3) and the second electric quantity sensor (4) are respectively connected to the PLC (1), and the environment temperature sensor and the transformer oil temperature sensor are respectively connected to the PLC (1);
inputting known parameters of the distribution transformer (5) through the touch display module (2);
measuring various data of the distribution transformer (5) in real time through the first electric quantity sensor (3) and the second electric quantity sensor (4);
the first electric quantity sensor (3) and the second electric quantity sensor (4) transmit integrated measurement data to the PLC (1);
the PLC (1) performs public calculation through the acquired measurement data and the known parameters of the distribution transformer (5);
the PLC (1) obtains the corresponding actual capacity value of the distribution transformer according to the calculated numerical range in the numerical matching parameter table;
the PLC (1) displays the acquired data, the measurement result and the calculation result on the touch display module (2).
2. The distribution transformer capacity online measurement method according to claim 1, wherein: the PLC (1) further comprises the step of verifying the correctness of wiring and device measurement before performing public calculation through the acquired measurement data and the known parameters of the distribution transformer (5):
calculating the active power of the high-voltage side: p (P) 1 calculation of ＝3U 1 I 1 cosφ 1 And the actual power P 1 And (5) comparing the correctness.
Calculating the active power of the low-voltage side: p (P) 2 calculation of ＝3U 2 I 2 cosφ 2 And the actual power P 2 And (5) comparing the correctness.
Calculating reactive power of a high-voltage side: q (Q) 1 calculation of ＝3U 1 I 1 sinφ 1 And the actual measurement power Q 1 And (5) comparing the correctness.
Calculating reactive power of the low-voltage side: q (Q) 2 calculation of ＝3U 2 I 2 sinφ 2 And the actual measurement power Q 2 And (5) comparing the correctness.
3. The distribution transformer capacity online measurement method according to claim 1, wherein: the PLC (1) performs public calculation through the acquired measurement data and the known parameters of the distribution transformer (5) and comprises the following steps:
calculating the oil temperature T according to the formula (1) 2 The sum of transformer dielectric loss power under current load
①P △T2℃ ＝P 1 -P 2
Calculating the oil temperature T according to the formula (2) 2 The sum of the dielectric loss power when the load is converted to full load
②P Full at DeltaT 2 DEG C ＝(S N /S 1 ) 2 *P △T2℃ Wherein S is N Transforming rated capacity for distribution
P is calculated according to formula (3) Full at DeltaT 2 DEG C Dielectric loss power P converted into ambient temperature of 75 DEG C △75℃
③P △75℃ ＝KP Full at DeltaT 2 DEG C Wherein K is a temperature conversion coefficient:
when the transformer is a copper coil: k= (235+75)/(235+t) 1 )
When the transformer is an aluminum coil: k= (225+75)/(225+t) 1 )
Wherein T is 1 Room temperature acquired for an ambient temperature sensor;
calculating reactive power difference between high-voltage side and low-voltage side of transformer according to formula (4)
④Q △ ＝|Q 1 -Q 2 |
On-line calculating the no-load current of the transformer according to formula (5)
⑤I 0 ＝Q △ /3U 1
The PLC (1) is used for matching the numerical range in the parameter table according to the calculated numerical value, wherein the matching basis is P △75℃ And I 0 。
4. The distribution transformer capacity online measurement method according to claim 1, wherein: three clamp-on current sensors (11) on the high-voltage side and the low-voltage side are used respectively.
5. The distribution transformer capacity online measurement method according to claim 1, wherein: the power adapter (13) is a power adapter for converting alternating current 220V into direct current 24V.
6. The distribution transformer capacity online measurement method according to claim 1, wherein: and the touch display module (2) uses a GOT embedded graphic operation terminal.
7. The distribution transformer capacity online measurement method according to claim 1, wherein: the first electric quantity sensor (3) and the second electric quantity sensor (4) transmit integrated measurement data to the PLC (1) through an RS485 communication interface by using a Modbus protocol.
8. A distribution transformer capacity online measurement system for implementing a distribution transformer capacity online measurement method according to any one of claims 1-7, comprising a high-voltage current transformer (6), a low-voltage current transformer (7), a clamp-on current sensor (11), and a high-voltage transformer (12), wherein: the intelligent power system comprises a power supply system, a power supply system and a power supply system, and further comprises an environment temperature sensor, a transformer oil temperature sensor, a first electric quantity sensor (3), a second electric quantity sensor (4), a PLC (programmable logic controller) (1) and a touch display module (2), wherein the PLC (1) is electrically connected with the touch display module (2), and the environment temperature sensor, the transformer oil temperature sensor, the first electric quantity sensor (3) and the second electric quantity sensor (4) are respectively electrically connected with the PLC (1); the power distribution system is characterized in that the clamp-shaped current sensor (11) is respectively arranged on the side of a secondary load (10) of the high-voltage current transformer (6) and the side of a secondary load of the low-voltage current transformer (7) and is respectively electrically connected with the first power sensor (3) and the second power sensor (4), the voltage transformer (12) is arranged on a high-voltage side bus (8) and the secondary side of the voltage transformer is electrically connected with the first power sensor (3), the low-voltage side bus (9) is electrically connected with the second power sensor (4), the touch display module (2) is used for inputting known parameters of the distribution transformer (5) and displaying acquired data, measurement results and calculation results, and the PLC (1) is used for carrying out public calculation on the acquired measurement data and the known parameters of the distribution transformer (5) and sending the acquired data, the measurement results and calculation results to the touch display module (2) to display according to a numerical range in a calculated numerical value matching parameter table.
9. An apparatus for online measurement of distribution transformer capacity, comprising a PLC programmable controller (1), characterized in that: comprising a memory and a processor, the memory for storing a computer program; the processor, when executing the computer program, is configured to implement the distribution transformer capacity online measurement method as defined in any one of claims 1-7.
10. A computer-readable storage medium, characterized by: the storage medium having stored thereon a computer program which, when executed by a processor, implements a distribution transformer capacity online measurement method as claimed in any one of claims 1-7.
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