CN111580012A - Dry-type air-core reactor fault online monitoring method and device - Google Patents
Dry-type air-core reactor fault online monitoring method and device Download PDFInfo
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Abstract
The invention discloses a dry-type air-core reactor fault on-line monitoring method, which comprises measuring the passing current of each star arm of the dry-type air-core reactor, and each star arm forms a comparison matrix through current to realize accurate measurement of various typical faults of the dry-type air-core reactor, meanwhile, the on-line monitoring device for the faults of the dry-type air-core reactor is also disclosed, which consists of a high-precision low-magnetic-density current transformer, an energy-taking current transformer, a main control device, a communication management machine and an upper computer, realizes the functions of high-voltage energy taking, accurate measurement of distributed current and wireless transmission of measured data in a high-magnetic field, and has the characteristics of high fault detection sensitivity, high safety and strong adaptability to electric and natural environments, so compared with the traditional power factor method, the method has the advantages of high fault identification sensitivity and small influence of external factors such as system voltage, current, environment temperature and the like; compared with the traditional magnetic field measurement method, the method has the advantages of direct measurement of body parameters, simple and direct measurement data and easy judgment.
Description
Technical Field
The invention relates to the technical field of fault detection, in particular to a dry-type air-core reactor fault on-line monitoring method and device.
Background
The dry-type air reactor is of a multi-package parallel structure, each package is formed by winding a plurality of small round wires with insulating films in parallel, and during operation, working current is converged in each star arm of the reactor through a wire and finally flows out to a bus through a connecting ring and the convergence arm. When the insulating film between the wires is aged to a certain degree due to discharge, hydrolysis, overheating and the like, the adjacent wires are in direct contact, and a short circuit ring is formed between the short-circuited turns due to the voltage difference between the adjacent wires, and such faults are collectively called turn-to-turn insulation faults and are also the main cause of burning of the reactor. On one hand, the short-circuit ring destroys the physical parameters of the original coil, on the other hand, a strong additional magnetic field is formed near the short-circuit ring, the inherent physical parameters of the coil are further destroyed, and the current distribution of each parallel branch of the reactor is changed.
The main causes of turn-to-turn short circuits are as follows:
(1) the operation environment of the dry-type air-core reactor is mostly outdoor, the reactor is in a high-temperature state for a long time due to long-term exposure to the high-temperature direct sunlight environment and the operation temperature rise of the reactor, and the service life of the insulating film is greatly shortened along with the increase of the temperature;
(2) the air-core reactor has no shell protection, the aging of the encapsulated surface of the reactor can be caused by long-time sun exposure and rain exposure, countless micro gaps invisible to naked eyes are formed on the surface of the reactor, water vapor enters the reactor to cause the water to be encapsulated and enter the reactor, and the aging of an insulating film is accelerated;
(3) most reactors do not operate for long periods of time and are only switched into the line when needed. During switching, switching overvoltage far higher than rated operation voltage can be generated, and impact is generated on the reactor. Under frequent switching, the reactor is continuously impacted, so that the insulating film is accelerated to age;
(4) technological reasons make the wire have weak points in the production process.
Meanwhile, jolt and electric power that the reactor received in service in the transportation process continuously for the upper and lower end lead wire of reactor appears the broken string condition easily, causes the local temperature rise of reactor to be on the high side, influences reactor safe operation.
According to statistics, turn-to-turn faults and disconnection are main reasons causing the faults of the reactor, and the faults can account for more than 90% of the current dry type air-core reactor burning accidents.
The existing fault monitoring method known in the industry judges whether the reactor has faults by monitoring the running temperature, running loss or magnetic field intensity change of the reactor, but the problems of low time delay, low sensitivity and the like generally exist, and the faults cannot be accurately and timely judged, so that the method is not widely popularized in the market.
Disclosure of Invention
The invention aims to provide a dry-type air reactor fault online monitoring method and a dry-type air reactor fault online monitoring device, aiming at solving the problem of poor safety in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the method for monitoring the dry-type air-core reactor fault on line specifically comprises the following steps:
s1, obtaining initial measurement current of each star arm, and dividing the current between any two star arms according to the combination, wherein IiAnd IjThe ratio of (A) to (B) is denoted as aijFrom all aijForming a matrix [ A ] according to a certain rule]The matrix is a symmetric matrix, and each numerical value in the matrix is a ratio of currents of different satellite arms;
s2, acquiring the real-time current of each star arm of the dry type air-core reactor at any time of operation, and similarly acquiring the ratio of the measured currents between any two star arms according to the method of the step S1 and recording the ratio as bijForm a real-time coefficient matrix [ B ]]；
S3, and comparing the real-time comparison matrix [ B ]]And matrix [ A ]]Compared with the obtained change rate m of the corresponding elementijForm a matrix [ M]Wherein said m isijThe formula of (1) is as follows: m isij=bij/aij-1；
S4, calculating whether any element in the matrix [ M ] exceeds a limit value according to a protection algorithm, judging that the reactor has a fault when the element exceeds the limit value and considering that an alarm condition is met, and feeding back to a system for processing, wherein i and j in the steps represent the digits of the star arm and are natural numbers.
Further, the specific steps of the protection algorithm in step S4 are as follows:
s4-1, presetting a change proportion limit value A of input current;
s4-2, acquiring initial current through a high-precision low-magnetic-density current transformer and an energy-taking current transformer, transversely comparing current ratios of any star arm, and storing;
s4-3, monitoring the current data change of each star arm in real time; acquiring initial measurement current of each satellite arm, acquiring an initial ratio of current between any two satellite arms, then monitoring the ratio in real time as a real-time ratio, acquiring the change condition of the real-time ratio as the change rate of the real-time ratio, and acquiring the comparison condition of the current of each satellite arm and the initial current as the current change ratio;
s4-4, judging whether the random longitudinal contrast change rate of the current ratio exceeds 50% of the change ratio limit value A, if yes, entering the step S4-6; if not, returning to the step S4-3, if yes, exceeding 100% of the change ratio limit value A, and entering the step S4-5;
s4-5, when the fault exists, feeding back the fault to the system for tripping;
and S4-6, feeding back to the system for alarm processing.
The invention also discloses a dry-type air reactor fault on-line detection device, which comprises a body arranged right below the air reactor, wherein the upper surface of the body is provided with a high-precision low-magnetic-density current transformer and an energy-taking current transformer, the high-precision low-magnetic-density current transformer is respectively sleeved on each star arm of the air reactor and is used for accurately measuring the current of each star arm, the energy-taking current transformer is used for carrying out CT energy taking, the high-precision low-magnetic-density current transformer is arranged on the star arm of the dry-type air reactor, an open-type current transformer is adopted, the energy-taking current transformer is arranged on a busbar of the dry-type air reactor, the device adopts on-line energy taking, the lower surface of the body is provided with a main controller which is electrically connected with the high-precision low-magnetic-density current transformer and the energy-taking current transformer, a communication manager positioned in a system, the main controller is used for acquiring data from the high-precision low-magnetic-density current transformers and the energy-taking current transformers, calculating through a protection algorithm, judging whether the electric reactors have faults or not, and feeding the faults back to a control unit for tripping the system if the electric reactors have the faults, the protection algorithm realizes the judgment of the problem of line breakage or turn-to-turn short circuit faults according to the current change of each star arm, and one energy-taking current transformer is distributed between every two adjacent high-precision low-magnetic-density current transformers.
In order to effectively shield electromagnetic interference, a pressure casting aluminum metal shell is arranged outside the main controller.
Preferably, the high-precision low-magnetic-density current transformer is a WYCT series open type current transformer, and a reactor star arm is sleeved on the side surface of the WYCT series open type current transformer.
In order to facilitate transmission, the communication manager realizes communication with the wireless transmission module on the main controller, and is in communication connection with a station control computer of the system by using a USB-to-serial port.
In order to improve the fixing effect, the high-precision low-magnetic-density current transformer is fixed on the star arm of the reactor through a fixing connecting piece.
Preferably, the fixed connecting piece comprises two L-shaped clamping plates which are symmetrically arranged, a lower transverse plate of each L-shaped clamping plate is fixed on the body, a longitudinal plate of each L-shaped clamping plate abuts against a corresponding reactor star arm, and the high-precision low-magnetic-density current transformer is limited outside the reactor star arms by the fixed connecting piece.
In order to improve the waterproof performance, a waterproof layer is arranged in the die-casting aluminum metal shell.
In order to facilitate the operation and adapt to different product requirements, the wireless transmission module adopts Zigbee, LoRa and 4G for compatibility, so that the dry-type air-core reactor fault online detection device can select different wireless transmission modes according to requirements,
the dry type air reactor in the structure is formed by winding a plurality of aluminum wires or copper wires with circular cross sections in parallel, and when the dry type air reactor runs, working current is converged in the star arm of the reactor through the wires and finally flows out through the busbar. Because the reactor structure is not changed after being cured at high temperature, the current distribution proportion of each star arm is also fixed. Therefore, when the reactor normally operates, the ratio of the currents of the star arms is a fixed value, and the distributed current does not change along with changes of electrical environments such as working current and natural environments such as temperature according to the current distribution principle of the reactor.
When the reactor is in turn-to-turn short circuit or disconnection, the number of turns or the number of the conducting wires of the reactor is changed, so that the balance of current distribution is damaged, and the current distribution of each star arm is changed. Particularly, the short-circuit turn branch circuit generally increases the current due to the reduction of the number of turns and the counteracting effect of the short-circuit turn induction magnetic field, and other branch circuits increase in different degrees, so that the change of the proportion of the current of the fault branch circuit and the current of the non-fault branch circuit is larger than the change of the current of the single branch circuit, and the detection sensitivity is higher by detecting the change of the current proportion. By measuring and calculating the current change condition of each star arm of the dry-type air-core reactor with typical type covering large and small capacity under the conditions of wire break and turn-to-turn short circuit, the current change proportion of a single star arm is more than 3% under the typical working condition of wire break or turn-to-turn short circuit.
Because the reactor has the influence of electrical environmental factors such as overvoltage, harmonic wave and the like during operation, the misjudgment is inevitably caused by simply monitoring the current value change of the star arm; the power of the monitoring reactor is also possible to be misjudged due to the change of the environmental temperature and the like, and a uniquely determined standard value is lacked; when the reactor has no fault, the current proportion between any two star arms and the proportion between the measured values at different times are fixed values. Therefore, the patent development algorithm realizes transverse and longitudinal multi-dimensional data tracking, can realize accurate measurement of various typical faults of the dry-type air reactor, has the characteristics of extremely small influence of natural and electric environments on the criterion, high algorithm redundancy, high reliability,
The invention has the beneficial effects that:
the online monitoring device disclosed by the invention comprises four parts, namely a measuring CT part, an energy-obtaining CT part, a communication manager and a main control board, wherein the multidimensional comparison measurement of body parameters is carried out through a comparison matrix of current distribution among star arms, so that the disconnection or turn-to-turn short circuit fault of the reactor can be effectively identified; in addition, the device adopts reliable electromagnetic shielding measures, the detection system can stably operate in a strong magnetic field, and the device has higher environmental adaptability, finally improves the overall use safety, and finally realizes the following advantages: 1. the measured data of each star arm form a comparison matrix, various typical faults such as disconnection, turn-to-turn insulation faults and the like occur, a plurality of data in the matrix can be changed, and the algorithm reliability is high; 2. the currents measured by the star arms can be used, the split-phase lateral difference protection principle is used, the currents measured by the star arms are reasonably distributed, the defect that double star arms are protected by split-phase lateral difference in operation is overcome, and the fault judgment precision is higher.
Drawings
Fig. 1 is a schematic structural diagram of an online fault detection device for a dry air-core reactor in this embodiment 1;
fig. 2 is a bottom perspective view of the dry-type air-core reactor fault on-line detection device in the embodiment 1;
FIG. 3 is a schematic diagram illustrating the connection between the master controller and the communication manager in this embodiment 1;
FIG. 4 is a schematic view showing the structure of a single fixed link in embodiment 1;
FIG. 5 is a schematic view showing an internal structure of a die-cast aluminum metal case according to example 1;
fig. 6 is a schematic flow chart of a dry-type air-core reactor fault online monitoring method.
In the figure: the device comprises a body 1, a reactor star arm 2, a high-precision low-magnetic-density current transformer 3, an energy-taking current transformer 4, a main controller 5, a communication manager 6, a die-casting aluminum metal shell 7, a fixed connecting piece 8, an L-shaped clamping plate 9, a lower transverse plate 9-2, a longitudinal plate 9-1, a waterproof layer 7-1 and a wireless transmission module 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 6, the present embodiment provides: the method for monitoring the dry-type air-core reactor fault on line specifically comprises the following steps:
s1, obtaining initial measurement current of each star arm, and dividing the current between any two star arms according to the combination, wherein IiAnd IjThe ratio of (A) to (B) is denoted as aijFrom all aijAccording to a certain proportionThe rule of (A) constitutes a matrix]The matrix is a symmetric matrix, and each numerical value in the matrix is a ratio of currents of different satellite arms;
s2, acquiring the real-time current of each star arm of the dry type air-core reactor at any time of operation, and similarly acquiring the ratio of the measured currents between any two star arms according to the method of the step S1 and recording the ratio as bijForm a real-time coefficient matrix [ B ]]；
S3, and comparing the real-time comparison matrix [ B ]]And matrix [ A ]]Compared with the obtained change rate m of the corresponding elementijForm a matrix [ M]Wherein said m isijThe formula of (1) is as follows: m isij=bij/aij-1；
S4, calculating whether any element in the matrix [ M ] exceeds a limit value according to a protection algorithm, judging that the reactor has a fault when the element exceeds the limit value and considering that an alarm condition is met, and feeding back to a system for processing, wherein i and j in the steps represent the digits of the star arm and are natural numbers.
Further, the specific steps of the protection algorithm in step S4 are as follows:
s4-1, presetting a change proportion limit value A of input current;
s4-2, acquiring initial current through a high-precision low-magnetic-density current transformer and an energy-taking current transformer, transversely comparing current ratios of any star arm, and storing;
s4-3, monitoring the current data change of each star arm in real time; acquiring initial measurement current of each satellite arm, acquiring an initial ratio of current between any two satellite arms, then monitoring the ratio in real time as a real-time ratio, acquiring the change condition of the real-time ratio as the change rate of the real-time ratio, and acquiring the comparison condition of the current of each satellite arm and the initial current as the current change ratio;
s4-4, judging whether the random longitudinal contrast change rate of the current ratio exceeds 50% of the change ratio limit value A, if yes, entering the step S4-6; if not, returning to the step S4-3, if yes, exceeding 100% of the change ratio limit value A, and entering the step S4-5;
s4-5, when the fault exists, feeding back the fault to the system for tripping;
and S4-6, feeding back to the system for alarm processing.
The matrices [ A ] and [ B ] are shown in the following tables, respectively:
table 1 shows the original current coefficient matrix [ A ]
| I1 | I2 | … | Ii | |
| I1 | a11 | a21 | … | ai1 |
| I2 | a12 | a22 | … | ai2 |
| … | … | … | … | … |
| Ij | a1j | a2j | … | aij |
Table 2 shows the real-time measured current coefficient matrix [ B ]
| I1 | I2 | … | Ii | |
| I1 | b11 | b21 | … | bi1 |
| I2 | b12 | b22 | … | bi2 |
| … | … | … | … | … |
| Ij | b1j | b2j | … | bij |
Table 3 is a matrix of rates of change [ M ]
| b11 | b12 | b13 | … | b21 | b22 | … | bij | |
| a11 | m11 | |||||||
| a12 | m12 | |||||||
| a13 | m13 | |||||||
| … | … | |||||||
| a21 | m21 | |||||||
| a22 | m22 | |||||||
| … | … | |||||||
| aij | mij |
In particular, the current change coefficient of each star arm can be obtained by dividing the current of each star arm at any operation time with the current of the original star arm, and the change of the coefficient can also be used as the basis for fault judgment. The two algorithms are similar in nature, but the method for forming the coefficient matrix by dividing the star arms has larger redundancy and more reliable judgment because the parameters can be checked with each other.
Referring to fig. 1-5, the embodiment further discloses an online fault detection device for a dry-type air reactor, which includes a main body 1 disposed right below the air reactor, the upper surface of the main body 1 is provided with a high-precision low-magnetic-density current transformer 3 and an energy-taking current transformer 4, the high-precision low-magnetic-density current transformer 3 is respectively sleeved on each star arm 2 of the air reactor and is used for accurately measuring the current of each star arm, the energy-taking current transformer 4 is used for performing CT energy taking, the high-precision low-magnetic-density current transformer 3 is mounted on the star arm of the dry-type air reactor, an open-type current transformer is adopted, the energy-taking current transformer 4 is mounted on a busbar of the dry-type air reactor, the online energy taking device adopts online energy taking, the lower surface of the main body 1 is provided with a main controller 5 electrically connected with the high-precision low-magnetic-density current transformer 3 and, the communication management machine 6 is responsible for receiving and transmitting remote data, the main controller 5 is used for acquiring data from the high-precision low-magnetic-density current transformers 3 and the energy-taking current transformers 4, then calculating through a protection algorithm, judging whether the electric reactors have faults or not, if the electric reactors have the faults, feeding the faults back to a control unit for tripping the system, and the protection algorithm realizes that the problem of line breakage or turn-to-turn short circuit faults is judged according to the current change of each star arm, and one energy-taking current transformer 4 is distributed between every two adjacent high-precision low-magnetic-density current transformers 3.
In order to effectively shield electromagnetic interference, a metal shell 7 made of die-cast aluminum is arranged outside the main controller 5.
Preferably, the high-precision low-magnetic-density current transformer 3 is a WYCT series open type current transformer, and the reactor star arm 2 is sleeved on the side surface.
In order to facilitate transmission, the communication manager 6 realizes communication with the wireless transmission module 10 on the main controller 5, and is in communication connection with a station control computer of the system by using a USB-to-serial port.
In order to improve the fixing effect, the high-precision low-magnetic-density current transformer 3 is fixed on the reactor star arm 2 through a fixing connecting piece 8.
Preferably, the fixed connecting piece 8 comprises two L-shaped clamping plates 9 which are symmetrically arranged, the lower transverse plates 9-2 of the L-shaped clamping plates 9 are fixed on the body 1, the longitudinal plates 9-1 of the L-shaped clamping plates 9 abut against the corresponding reactor star arms 2, and the high-precision low-magnetic-density current transformer 3 is limited outside the reactor star arms 2 by the fixed connecting piece 8.
In order to improve the waterproof performance, a waterproof layer 7-1 is arranged in the die-casting aluminum metal shell 7.
In order to facilitate operation and meet different product requirements, the wireless transmission module 10 adopts Zigbee, LoRa, 4G for compatibility, so that a dry-type air-core reactor fault online detection device with different wireless transmission modes can be selected according to requirements.
The dry type air reactor in the structure is formed by winding a plurality of aluminum wires or copper wires with circular cross sections in parallel, and when the dry type air reactor runs, working current is converged in the star arm of the reactor through the wires and finally flows out through the busbar. Because the reactor structure is not changed after being cured at high temperature, the current distribution proportion of each star arm is also fixed. Therefore, when the reactor normally operates, the ratio of the currents of the star arms is a fixed value, and the distributed current does not change along with changes of electrical environments such as working current and natural environments such as temperature according to the current distribution principle of the reactor.
When the reactor is in turn-to-turn short circuit or disconnection, the number of turns or the number of the conducting wires of the reactor is changed, so that the balance of current distribution is damaged, and the current distribution of each star arm is changed. Particularly, the short-circuit turn branch circuit generally increases the current due to the reduction of the number of turns and the counteracting effect of the short-circuit turn induction magnetic field, and other branch circuits increase in different degrees, so that the change of the proportion of the current of the fault branch circuit and the current of the non-fault branch circuit is larger than the change of the current of the single branch circuit, and the detection sensitivity is higher by detecting the change of the current proportion. By measuring and calculating the current change condition of each star arm of the dry-type air-core reactor with typical type covering large and small capacity under the conditions of wire break and turn-to-turn short circuit, the current change proportion of a single star arm is more than 3% under the typical working condition of wire break or turn-to-turn short circuit.
Because the reactor has the influence of electrical environmental factors such as overvoltage, harmonic wave and the like during operation, the misjudgment is inevitably caused by simply monitoring the current value change of the star arm; the power of the monitoring reactor is also possible to be misjudged due to the change of the environmental temperature and the like, and a uniquely determined standard value is lacked; when the reactor has no fault, the current proportion between any two star arms and the proportion between the measured values at different times are fixed values. Therefore, the algorithm is developed, transverse and longitudinal multi-dimensional data tracking is achieved, accurate measurement of various typical faults of the dry-type air reactor can be achieved, the influence of the natural and electric environments on the criterion is small, the algorithm redundancy is high, and the reliability is high.
The high-precision low-magnetic-density current transformer is arranged on a star arm of the dry-type air reactor, and is convenient to install due to the adoption of the open-type current transformer. According to the strength of the surrounding magnetic field, the iron core material of the magnetic field generator is freely selected from two types of ferromagnetic materials and non-ferromagnetic materials, so that the heat is prevented from affecting the safe operation of the equipment.
The energy-taking current transformer is arranged on a bus bar of the dry-type air-core reactor, the device adopts on-line energy taking without arranging a battery, the maintenance is simple, the special energy-taking current transformer and the power module are adopted, the power supply current is large, the technology is mature, and the power supply requirement of the main control device can be met.
The main control device case is made of a material which has a good shielding effect and can generate heat controllably, so that a strong magnetic field can be effectively shielded, and the main control device can work normally under the strong magnetic field of the air reactor.
The communication management machine is designed to adopt wireless communication and master control device communication, adopt RS-485 communication mode and upper computer communication, and simultaneously have the functions of alarming and tripping.
And the upper computer displays the current information of each star arm of the air reactor and data obtained by an algorithm in real time at a computer end.
The main controller 5 and the communication manager use an STM32F407 single chip microcomputer as a CPU, the main control device collects current data of each star arm of the dry-type air reactor, the current data are processed by a signal modulation circuit and then enter the CPU, the CPU monitors the state of the dry-type air reactor according to a program algorithm, and star arm current information and fault records of the air reactor are transmitted to the communication manager in a wireless communication mode.
The online monitoring device disclosed by the embodiment comprises four parts, namely a measurement CT, an energy acquisition CT, a communication manager and a main control board, wherein the multidimensional comparison measurement of body parameters is carried out through a comparison matrix of current distribution among star arms, so that the disconnection or turn-to-turn short circuit fault of the reactor can be effectively identified, the current distribution proportion depends on the structure of the reactor body, the influence of system voltage, current fluctuation and environment temperature is avoided, and the reliability is higher; in addition, the device adopts reliable electromagnetic shielding measures, the detection system can stably operate in a strong magnetic field, has higher environmental adaptability, finally improves the overall use safety, finally realizes that the measured data of each star arm form a comparison matrix, various typical faults such as disconnection, turn-to-turn insulation faults and the like occur, a plurality of data in the matrix can change, and the algorithm reliability is high; meanwhile, currents measured by the star arms can be used, the split-phase lateral difference protection principle is used, currents measured by the star arms are reasonably distributed, the defect that double star arms are protected by split-phase lateral difference is overcome, the fault judgment precision is higher, and the following advantages are achieved:
(1) the method is characterized by comprising four parts of a measuring CT, an energy-taking CT, a communication management machine and a main control board, and a self-developed protection algorithm is used for judging the disconnection or turn-to-turn short circuit fault according to the current change of each star arm.
(2) The current distribution of each star arm is monitored in real time, and the multidimensional comparison measurement of body parameters is carried out through a comparison matrix of the current distributed among the star arms, so that the disconnection or turn-to-turn short circuit fault of the reactor can be effectively identified.
(3) The measurement CT can accurately measure the current of each star arm, and the energy acquisition CT selects a special energy acquisition CT, so that the CT has the advantages of large power supply current and mature technology.
(4) The communication manager is responsible for the reception of remote data.
(5) And the main control board calculates the acquired data through a protection algorithm, judges whether the reactor has a fault or not, and feeds the fault back to the system for tripping if the reactor has the fault.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A dry-type air-core reactor fault on-line monitoring method is characterized in that: the method specifically comprises the following steps:
s1, obtaining initial measurement current of each star arm, and dividing the current between any two star arms according to the combination, wherein IiAnd IjThe ratio of (A) to (B) is denoted as aijFrom all aijForming a matrix [ A ] according to a certain rule]The matrix is a symmetric matrix, and each numerical value in the matrix is a ratio of currents of different satellite arms;
s2, acquiring the real-time current of each star arm of the dry type air-core reactor at any time of operation, and similarly acquiring the ratio of the measured currents between any two star arms according to the method of the step S1 and recording the ratio as bijForm a real-time coefficient matrix [ B ]]；
S3, and comparing the real-time comparison matrix [ B ]]And matrix [ A ]]Compared with the obtained change rate m of the corresponding elementijForm a matrix [ M]Wherein said m isijThe formula of (1) is as follows: m isij=bij/aij-1；
S4, calculating whether any element in the matrix [ M ] exceeds a limit value according to a protection algorithm, judging that the reactor has a fault when the element exceeds the limit value and considering that an alarm condition is met, and feeding back to a system for processing, wherein i and j in the steps represent the digits of the star arm and are natural numbers.
2. The dry-type air-core reactor fault on-line monitoring method according to claim 1, characterized in that: the specific steps of the protection algorithm in step S4 are as follows:
s4-1, presetting a change proportion limit value A of input current;
s4-2, acquiring initial current through a high-precision low-magnetic-density current transformer and an energy-taking current transformer, transversely comparing current ratios of any star arm, and storing;
s4-3, monitoring the current data change of each star arm in real time; acquiring initial measurement current of each satellite arm, acquiring an initial ratio of current between any two satellite arms, then monitoring the ratio in real time as a real-time ratio, acquiring the change condition of the real-time ratio as the change rate of the real-time ratio, and acquiring the comparison condition of the current of each satellite arm and the initial current as the current change ratio;
s4-4, judging whether the random longitudinal contrast change rate of the current ratio exceeds 50% of the change ratio limit value A, if yes, entering the step S4-6; if not, returning to the step S4-3, if yes, exceeding 100% of the change ratio limit value A, and entering the step S4-5;
s4-5, when the fault exists, feeding back the fault to the system for tripping;
and S4-6, feeding back to the system for alarm processing.
3. The utility model provides a dry-type air-core reactor trouble on-line measuring device, is including locating body (1) under the air-core reactor, its characterized in that: the upper surface of the body (1) is provided with a high-precision low-magnetic-density current transformer (3) which is respectively sleeved on each star arm (2) of the air reactor and used for accurately measuring the current of each star arm and an energy-taking current transformer (4) used for CT energy taking, the high-precision low-magnetic-density current transformer (3) is arranged on the star arm of the dry-type air reactor, an open-type current transformer is adopted, the energy-taking current transformer (4) is arranged on a busbar of the dry-type air reactor, online energy taking is adopted, the lower surface of the body (1) is provided with a main controller (5) which is electrically connected with the high-precision low-magnetic-density current transformer (3) and the energy-taking current transformer (4), the main controller (5) is in communication connection with a communication manager (6) positioned in a system, and the communication manager (6) is responsible for receiving and transmitting remote data, the main controller (5) is used for acquiring data from the high-precision low-magnetic-density current transformers (3) and the energy-taking current transformers (4), calculating through a protection algorithm, judging whether the electric reactors have faults or not, if the electric reactors have the faults, feeding the faults back to a control unit for tripping the system, judging the problem of line breakage or turn-to-turn short circuit faults according to current changes of each star arm through the protection algorithm, and distributing one energy-taking current transformer (4) between every two adjacent high-precision low-magnetic-density current transformers (3).
4. The dry-type air-core reactor fault on-line detection device according to claim 3, characterized in that: and a metal shell (7) made of a die-cast aluminum material is arranged outside the main controller (5).
5. The dry-type air-core reactor fault on-line detection device according to claim 3, characterized in that: the high-precision low-magnetic-density current transformer (3) is a WYCT series open type current transformer, and a reactor star arm (2) is sleeved on the side surface.
6. The dry-type air-core reactor fault on-line detection device according to claim 3, characterized in that: the communication management machine (6) realizes communication with the wireless transmission module (10) on the main controller (5), and is in communication connection with a station control computer of the system by using a USB-to-serial port.
7. The dry-type air-core reactor fault on-line detection device according to claim 3, characterized in that: the high-precision low-magnetic-density current transformer (3) is fixed on the reactor star arm (2) through a fixed connecting piece (8).
8. The dry-type air-core reactor fault on-line detection device of claim 7, characterized in that: the fixed connecting piece (8) comprises two L-shaped clamping plates (9) which are symmetrically arranged, lower transverse plates (9-2) of the L-shaped clamping plates (9) are fixed on the body (1), longitudinal plates (9-1) of the L-shaped clamping plates (9) are abutted to corresponding reactor star arms (2), and the high-precision low-magnetic-density current transformer (3) is limited outside the reactor star arms (2) by the fixed connecting piece (8).
9. The dry-type air-core reactor fault on-line detection device according to claim 3, characterized in that: a waterproof layer (7-1) is arranged in the die-casting aluminum metal shell (7).
10. The dry-type air-core reactor fault on-line detection device of claim 6, characterized in that: the wireless transmission module (10) adopts Zigbee, LoRa and 4G for compatibility, and different wireless transmission modes can be selected according to requirements.
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