CN113075538A - Monitoring method, monitoring device and monitoring system for on-load tap-changer - Google Patents

Monitoring method, monitoring device and monitoring system for on-load tap-changer Download PDF

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Publication number
CN113075538A
CN113075538A CN202110288229.XA CN202110288229A CN113075538A CN 113075538 A CN113075538 A CN 113075538A CN 202110288229 A CN202110288229 A CN 202110288229A CN 113075538 A CN113075538 A CN 113075538A
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China
Prior art keywords
changer
load tap
baffle
rotation
energy
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CN202110288229.XA
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CN113075538B (en
Inventor
江丹宇
马志钦
韩正家
杨贤
陈天生
吴娅
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275—Fault detection or status indication
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Protection Of Transformers (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

The invention discloses a monitoring method, a monitoring device and a monitoring system for an on-load tap-changer. The method comprises the following steps: acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay; determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period; determining the operating state of the on-load tap-changer according to the baffle plate rotation energy; and executing corresponding processing actions according to the running state of the on-load tap-changer. The invention is based on the new monitoring logic of the on-load tap-changer, determines the running state of the on-load tap-changer according to the rotation condition of the baffle inside the intelligent gas relay and the rotation condition of the baffle, thereby finding the latent defect of the on-load tap-changer in time and realizing the on-line monitoring and the fault early warning.

Description

Monitoring method, monitoring device and monitoring system for on-load tap-changer
Technical Field
The invention relates to the technical field of power control systems, in particular to a method and a device for monitoring an on-load tap-changer, a system for monitoring the on-load tap-changer and a computer readable storage medium.
Background
An on-load tap changer is a device for adjusting an output voltage by changing a turn ratio of a high-voltage winding and a low-voltage winding by switching a tap of a transformer winding under the condition of transformer excitation or under a load, and plays an important role in voltage adjustment of a power system. At present, an on-load tap-changer commonly used for a power transformer is of an oil-immersed type, namely, a switching part is placed in an independent oil chamber filled with insulating oil, and the insulating oil plays roles of heat dissipation, arc extinction, insulation and the like.
In actual operation, gas relays are installed between oil chambers of the oil immersed on-load tap-changer and connecting pipelines of oil conservators, and the gas relays are used as protection devices, and protection of the gas relays is divided into light gas protection and heavy gas protection. The light gas protection mainly reflects that gas generated by oil decomposition rises into a gas relay when the gas relay is in operation or has a slight fault, the gas is gathered to enable the oil level to fall, an opening cup or a floating ball of the relay falls along with the oil level to drive a dry spring contact to be connected, and an alarm signal is sent. The heavy gas protection mainly reflects that when a serious internal fault occurs in the on-load tap-changer, strong gas generated by electric/thermal energy of the fault generates surge oil to flow to the direction of an oil conservator for impact, an internal baffle of the relay is opened, a dry spring contact is driven to be connected, and a trip signal is sent.
During switching of the on-load tap changer, strong vibration is generated along with release of mechanical energy, so that the surge of the insulating oil is caused. In addition, compared with an on-load tap-changer (oil arc-extinguishing switch) with an arc-extinguishing contact directly positioned in oil, the on-load tap-changer (oil arc-extinguishing switch) with the arc-extinguishing contact packaged in a vacuum bulb has the switching process accompanied with the breaking of electric arcs, and the induced surge of insulating oil is relatively stronger. However, under normal conditions, no matter what type of switch, the caused surge of insulating oil can far reach the setting value of heavy gas action of the gas relay (the setting flow rate of the gas relay of the general on-load tap-changer is between 0.8m/s and 1.0m/s, and the oil flow rate at the pipeline caused by normal switching is not more than 0.1m/s according to typical experiments and operation experiences).
In recent years, many on-load tap-changers have failed in the range of power grids mainly due to poor contact caused by abrasion and ablation of contacts. For on-load tap changers, once there is a problem with contact, a small number of gear shifting operations can cause the contact to quickly change from overheating to arcing, causing a fault. And the traditional gas relay is used, and the traditional flow rate setting method can only send out a signal to cut off the power supply of each side of the transformer at an early point after a fault occurs, so that the method is useless for early defect detection.
Disclosure of Invention
The invention aims to provide an on-load tap-changer monitoring method, an on-load tap-changer monitoring device, an on-load tap-changer monitoring system and a computer readable storage medium.
In order to achieve the above object, an embodiment of the present invention provides a method for monitoring an on-load tap changer, including:
acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay;
determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period;
determining the operating state of the on-load tap-changer according to the baffle plate rotation energy;
and executing corresponding processing actions according to the running state of the on-load tap-changer.
In one embodiment, the energy of the single rotation of the baffle is specifically:
E＝∫θ(t)dt
wherein E represents the energy causing the baffle to act, t represents the time of a primary event causing the baffle to start rotating until the baffle returns to a zero position, and θ (t) is a function of the rotation angle of the baffle in the primary event and the time;
accumulating the energy E of the rotation within the preset time period of the baffle, specifically:
Figure BDA0002980476850000021
wherein n represents the total number of single events in the preset time period.
In one embodiment, the method further comprises the following steps:
when the on-load tap-changer is in a voltage regulating state, correcting the energy of the single rotation of the baffle plate according to the following formula:
E＝∫(θ(t)-2)dt。
in one embodiment, the operating state of the on-load tap-changer comprises a normal state, an attention state and a serious state;
determining the operating state of the on-load tap-changer according to the baffle plate rotation energy, and executing corresponding processing actions according to the operating state of the on-load tap-changer, wherein the processing actions specifically comprise:
when the on-load tap-changer is determined to be in the normal state according to the baffle plate rotation energy, the on-load tap-changer is not operated;
when the on-load tap-changer is determined to be in the attention state according to the baffle plate rotation energy, selectively powering off for checking;
and when the on-load tap-changer is determined to be in the serious state according to the baffle plate rotating energy, the power failure is required to be immediately carried out for checking, and meanwhile, the voltage regulating operation is forbidden before the power failure is finished.
In one embodiment, the determining the operating state of the on-load tap-changer according to the baffle rotation energy specifically comprises:
when E is 0, determining that the on-load tap-changer is in a normal state;
when 0 < E1And 0 < ∑ E < E1Determining that the on-load tap-changer is in an attention state;
when E is2＞E＞E1Or E2＞∑E＞E1Determining that the on-load tap-changer is in a severe state;
when E > E2Or Σ E > E2When the transformer is in use, a tripping signal is sent out, and the tripping signal is used for controlling the tripping of the transformer; wherein the attention threshold for the on-load tap-changer state is E1＝1/2E0A critical value of E2＝4/5E0，E0Is the reference energy for a single rotation of the shutter.
In one embodiment, the method further comprises the following steps:
when the rotation of the baffle is monitored, an alarm signal is sent out immediately, and when a heavy gas action signal is sent out, the transformer is controlled to trip.
The embodiment of the present invention provides a monitoring device for an on-load tap-changer, including:
the acquisition module is used for acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay;
the first determining module is used for determining the rotation energy of the baffle according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period;
the second determination module is used for determining the running state of the on-load tap-changer according to the baffle plate rotation energy;
and the execution module is used for executing corresponding processing actions according to the running state of the on-load tap-changer.
In one embodiment, the operating state of the on-load tap-changer comprises a normal state, an attention state and a serious state;
the execution module is specifically configured to:
when the second determination module determines that the on-load tap-changer is in the normal state according to the baffle rotation energy, the second determination module does not operate;
when the second determining module determines that the on-load tap-changer is in the attention state according to the baffle rotation energy, checking for selective power failure;
when the second determining module determines that the on-load tap-changer is in the serious state according to the baffle rotation energy, the power failure needs to be immediately carried out for checking, and meanwhile, the voltage regulating operation is forbidden before the power failure is finished.
The embodiment of the invention also provides a monitoring system of the on-load tap-changer, which comprises:
an on-load tap-changer;
the intelligent gas relay is arranged on a connecting pipeline between an oil conservator and an oil chamber of the on-load tap-changer;
processing apparatus, respectively with on-load tap-changer with gather the sensor connection of the rotation angle's that intelligent gas relay's baffle corresponds rotation signal includes: one or more processors and memory coupled to the processors, the processors to store one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of monitoring an on-load tap changer as in any of the embodiments described above.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for monitoring an on-load tap changer according to any of the above embodiments.
The monitoring method, the monitoring device, the monitoring system and the computer readable storage medium of the on-load tap-changer of the embodiment of the invention provide a new monitoring logic of the on-load tap-changer, determine the running state of the on-load tap-changer according to the rotation condition of the baffle inside the intelligent gas relay and the rotation condition of the baffle, and specifically comprise the following steps: acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay; determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period; determining the operating state of the on-load tap-changer according to the baffle plate rotation energy; and executing corresponding processing actions according to the running state of the on-load tap-changer. Therefore, based on the new monitoring logic of the on-load tap-changer, the latent defect of the on-load tap-changer can be found in time, and online monitoring and fault early warning are realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a method for monitoring an on-load tap changer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a monitoring system for an on-load tap changer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a monitoring device for an on-load tap changer according to an embodiment of the present invention.
Description of the main elements and symbols:
100. a monitoring device for an on-load tap-changer; 110. an acquisition module; 120. a first determination module; 130. a second determination module; 140. an execution module; 200. a monitoring system for an on-load tap changer; 210. an on-load tap-changer; 211. an oil chamber; 212. an oil conservator; 220. an intelligent gas relay; 221. a baffle plate; 230. a processing device; 240. and connecting the pipelines.
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.
It should be understood that the step numbers used herein are for convenience of description only and are not used as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a method for monitoring an on-load tap changer, including the following steps:
s10, obtaining a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay;
s20, determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period;
s30, determining the running state of the on-load tap-changer according to the baffle plate rotation energy;
and S40, executing corresponding processing actions according to the running state of the on-load tap-changer.
The method for monitoring an on-load tap-changer according to the embodiment of the present invention can be applied to the monitoring system 200 of an on-load tap-changer as shown in fig. 2. Specifically, the on-load tap changer monitoring system 200 includes an on-load tap changer 210, a smart gas relay 220, and a processing device 230.
And the intelligent gas relay 220 is installed on a connecting pipeline 240 between the oil conservator 212 and the oil chamber 211 of the on-load tap-changer 210.
The processing device 230 is connected to the on-load tap-changer 210 and the sensor for collecting the baffle rotation signal of the rotation angle corresponding to the baffle 221 of the intelligent gas relay 220, and includes: one or more processors and memory. A memory is coupled to the processor for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the method of monitoring an on-load tap changer of any of the above embodiments.
In the present embodiment, the intelligent gas relay 220 is installed on the connecting pipe 240 between the conservator 212 of the on-load tap-changer 210 and the oil chamber 211 (the switching part of the on-load tap-changer 210 is located in the oil chamber 211), and the baffle rotation signal of the intelligent gas relay 220 is connected to the processing device 230. Meanwhile, voltage regulation control signals of the on-load tap-changer 210 (the on-load tap-changer 210 is provided with a voltage regulation operation mechanism box, and the on-load tap-changer 210 can remotely control the motor to operate for voltage regulation) are synchronously connected to the processing device 230.
The intelligent gas relay 220 in this embodiment may adopt the intelligent gas relay in the published patent: for example, a gas relay, publication No. CN 211376523U; for another example, the patent is named as an intelligent gas relay device with publication number CN 211404395U. The detailed structure of the intelligent gas relay 220 will not be described herein.
The processing device 230 has functions of logic judgment, trip control, signal alarm, etc., and is used for controlling the overall operation of the on-load tap-changer monitoring system 200 to complete all or part of the steps of the on-load tap-changer monitoring method.
It should be noted that the normal voltage regulation logic of the transformer should be: the on-load tap-changer 210 is in a non-voltage-regulating state, the body of the intelligent gas relay 220 does not send a heavy gas action signal, the rotation angle of the baffle 221 maintains a zero angle, and a trip signal is not sent; the on-load tap-changer 210 is in a voltage regulation state, when strong gas generated by electric/thermal energy of a fault in the oil chamber 211 generates surging oil and impacts towards the direction of an oil conservator (namely, oil flow reaches a preset value), a dry spring contact sealed in a vacuum glass tube jumps to a closed state from a separated state under the action of a magnet, a heavy gas protection loop is switched on, so that a body of the intelligent gas relay 220 sends out a heavy gas action signal (similar to 0 or 1 level), the rotation angle of the baffle 221 is correspondingly increased and maintained at a larger value, and a tripping signal is sent out. The voltage regulation state of the on-load tap-changer 210 is a working state in which the on-load tap-changer 210 changes the turn ratio of the high-voltage winding and the low-voltage winding by switching the transformer winding tap under the condition of transformer excitation or with load, so as to regulate the output voltage (i.e. the voltage ratio of the transformer).
In order to solve the problem that the conventional flow rate setting method can only send a signal to cut off a power supply on each side of a transformer at an early point after a fault occurs and cannot be used for early defect detection, the embodiment of the invention provides a novel monitoring logic of an on-load tap-changer.
In a specific embodiment, the baffle rotation signal is collected by sensors distributed on the baffle 221 of the intelligent gas relay 220, and the consistency of the corresponding relationship between the baffle rotation signal and the rotation angle of the baffle 221 is high, so that the rotation angle corresponding to the baffle 221 of the intelligent gas relay 220 is determined.
Specifically, in step S10, the energy of a single rotation of the baffle is specifically:
E＝∫θ(t)dt
wherein E represents the energy causing the motion of the baffle 221, t represents the time of a single event causing the baffle 221 to start rotating until the baffle 221 returns to a zero position, and θ (t) is a function of the rotation angle of the baffle 221 and the time in the single event;
the energy Σ E accumulated in the rotation of the baffle 221 in the preset time period is specifically:
Figure BDA0002980476850000061
wherein n represents the total number of single events in the preset time period.
Specifically, once it is monitored that the baffle 221 inside the intelligent gas relay 220 rotates, an alarm signal is sent out immediately, and meanwhile, the real-time integral calculation is carried out on the baffle rotation angle and the duration: e ═ θ (t) dt, until the baffle returns to zero, noting it as a primary event. E reflects the energy causing the motion of the shutter 221 and θ (t) is a function of the angle of rotation of the shutter 221 and time during an event.
In one sub-embodiment, the predetermined time period is 24h, and Σ E represents the sum of all single-event energies E up to 24h before the current calculation time. In other sub-embodiments, the preset time period may be other, and is not specifically limited herein.
It should be noted that, on-load tap-changer can be along with the release of continuous mechanical energy in the pressure regulating process, produces stronger vibration, and the inside electric arc or striking sparks that probably still can produce of on-load tap-changer oil tank all can cause the gas relay baffle of insulating oil surge impact of certain degree simultaneously. Therefore, the energy E of the event occurring in the voltage regulation state needs to be corrected to eliminate possible vibration or arc interference.
In one embodiment, the method further comprises the following steps:
when the on-load tap-changer 210 is in the voltage regulation state, the energy of a single rotation of the baffle 221 is corrected according to the following formula:
E＝∫(θ(t)-2)dt。
it can be understood that when the rotation of the baffle 221 inside the intelligent gas relay 220 is monitored in the pressure regulating state, the energy E of the intelligent gas relay needs to be corrected, and the specific operation of the correction is as follows: the rotation angle of the baffle 221 of the intelligent gas relay 220, which may be caused by the largest interference, is not more than 2 ° (equivalent to the oil flow velocity at the pipeline caused by normal pressure regulation not more than 0.1m/s), and the correction value E ═ q (θ (t) -2) dt is calculated.
In step S30, the operating status of the on-load tap changer 210 includes a normal status, an attention status, and a serious status;
determining the operating state of the on-load tap-changer 210 according to the baffle plate rotation energy, and executing corresponding processing actions according to the operating state of the on-load tap-changer 210, specifically:
not operating when the on-load tap-changer 210 is determined to be in the normal state based on the damper rotation energy;
when it is determined from the damper rotation energy that the on-load tap-changer 210 is in the attentive state, a selective power outage is checked;
when it is determined that the on-load tap-changer 210 is in the severe state according to the baffle rotation energy, a power outage is immediately required to check, and meanwhile, the voltage regulation operation is prohibited before the power outage is completed.
Therefore, in one embodiment, step S30 determines the operating status of on-load tap changer 210 according to the rotational energy of the baffle, specifically:
when E is 0, determining that the on-load tap-changer 210 is in a normal state;
when 0 < E1And 0 < ∑ E < E1Then it is determined that the on-load tap-changer 210 is in the attentive state;
when E is2＞E＞E1Or E2＞∑E＞E1Then it is determined that the on-load tap-changer 210 is in a severe state;
when E > E2Or Σ E > E2When the transformer is in use, a tripping signal is sent out, and the tripping signal is used for controlling the tripping of the transformer; wherein the on-load tap-changer state 210 has an attention threshold of E1＝1/2E0A critical value of E2＝4/5E0，E0Is the reference energy for a single rotation of the shutter 221.
It can be understood that based on the new monitoring logic of the on-load tap-changer 210, the operation state of the on-load tap-changer 210 is determined in advance according to the rotation condition of the baffle 221 inside the intelligent gas relay 220 and the rotation condition of the baffle 221, so that the latent defect of the on-load tap-changer 210 can be found in time, and the on-line monitoring and fault early warning can be realized.
Specifically, when E is equal to 0, the baffle 221 does not rotate, and according to the protection mode of the intelligent gas relay 220 itself, as long as the baffle 221 inside the intelligent gas relay 220 does not rotate, no matter whether the heavy gas protection circuit is connected or not, and the heavy gas action signal is sent, the heavy gas action signal (similar to the level of 0 or 1) is not output to the processing device 230, so that it is determined that the on-load tap-changer 210 is in the normal state.
In a sub-embodiment, the method further comprises:
when the baffle 221 is monitored to rotate, an alarm signal is sent out immediately, and when a heavy gas action signal is sent out, the transformer is controlled to trip.
It can be understood that only when the rotation of the internal baffle 221 is monitored, the heavy gas action signal sent by the intelligent gas relay 220 is output to the processing device 230, so as to determine that the on-load tap-changer 210 is in a fault state, thereby controlling the transformer to trip.
A large number of field fault cases show that when a fault occurs inside a transformer or an on-load tap-changer, a heavy gas signal is often exported tens of milliseconds to more than one hundred milliseconds after the zero moment of the fault, and the larger the fault energy is, the shorter the time interval of heavy gas signal export is. Under the strict condition, the 20ms outlet value is taken as the reference. Meanwhile, the maximum opening and closing angle of the gas relay baffle is generally 22-25 degrees, and 20 degrees is taken as reference. A state in which the buchholz relay barrier reaches an opening and closing angle of 20 ° from the closed state within 20ms can be obtained in a typical severe failure situation. The baffle action time is extremely short, and can be regarded as a slope, namely the function relation of the baffle rotation angle and the time is theta (t) to t (the unit of t is ms), and the integral value E of the baffle rotation angle and the duration is obtained0＝∫θ(t)dt＝1/2*20ms*20°＝200. Based on this, the state attention value of the on-load tap-changer 210 is set to be E1＝1/2E0A severity value of E2＝4/5E0。
In summary, the on-load tap-changer monitoring method in the embodiment of the present invention is as follows:
(1) according to the protection mode of the intelligent gas relay 220, as long as the internal baffle 221 of the intelligent gas relay 220 does not rotate, no matter whether a heavy gas action signal is sent, the heavy gas action signal is not output to the processing device 230, and the on-load tap-changer 210 is in a normal state. Only when the internal baffle 221 is monitored to rotate, the heavy gas action signal sent by the intelligent gas relay 220 is output to the processing device 230 to control the transformer to trip.
(2) When 0 < E1And 0 < ∑ E < E1The on-load tap-changer 210 is in the attentive state and does not need to be checked for a special power outage.
(3) When E is2＞E＞E1Or E2＞∑E＞E1In time, the on-load tap-changer 210 is in a severe state and needs to be checked immediately by a power outage. While the on-load tap-changer 210 in a severe condition prohibits the voltage regulation operation before the power outage is completed.
(4) When E > E2Or Σ E > E2The processing device 230 directly sends out a trip signal to control the transformer to trip.
To sum up, the method for monitoring an on-load tap-changer according to the embodiment of the present invention provides a new monitoring logic of the on-load tap-changer 210, and determines the operation state of the on-load tap-changer 210 according to the rotation condition of the baffle 221 inside the intelligent gas relay 220 and according to the rotation condition of the baffle 221, specifically: acquiring a baffle rotation signal for determining a rotation angle corresponding to a baffle 221 of the intelligent gas relay 220; determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period; determining an operating state of the on-load tap-changer 210 according to the baffle rotation energy; and executing corresponding processing actions according to the running state of the on-load tap-changer 210. Therefore, based on the new monitoring logic of the on-load tap-changer 210, the latent defect of the on-load tap-changer 210 can be found in time, and online monitoring and fault early warning are realized.
Referring to fig. 3, an embodiment of the invention provides a monitoring apparatus 100 for an on-load tap-changer, which is applied to the monitoring method for an on-load tap-changer in any of the embodiments. The monitoring device 100 includes:
the acquiring module 110 is configured to acquire a baffle rotation signal used for determining a rotation angle corresponding to a baffle 221 of the intelligent gas relay 220;
a first determining module 120, configured to determine a baffle rotation energy according to the baffle rotation signal; the baffle rotation energy comprises energy of a single rotation of the baffle 221 and energy of accumulated rotation in a preset time period;
a second determination module 130, configured to determine an operating state of the on-load tap-changer 210 according to the damper rotation energy;
the executing module 140 is configured to execute a corresponding processing action according to the operating state of the on-load tap-changer 210.
In one embodiment, the operating status of the on-load tap-changer 210 includes a normal status, an attention status, and a serious status;
the executing module 140 is specifically configured to:
when the second determination module 130 determines that the on-load tap-changer 210 is in the normal state according to the baffle rotation energy, it does not operate;
when the second determination module 130 determines that the on-load tap-changer 210 is in the attentive state according to the baffle rotation energy, checking for a selective power failure;
when the second determining module 130 determines that the on-load tap-changer 210 is in the serious state according to the baffle rotation energy, it needs to immediately perform a power failure for checking, and at the same time, it prohibits the voltage regulating operation before the power failure is completed.
For specific limitations of the on-load tap-changer monitoring device 100, reference may be made to the above limitations on the on-load tap-changer monitoring method, which is not described herein again. The modules in the on-load tap changer monitoring device 100 may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Referring to fig. 2, an embodiment of the invention provides a monitoring system 200 for an on-load tap changer, which includes an on-load tap changer 210, an intelligent gas relay 220, and a processing device 230.
And the intelligent gas relay 220 is installed on a connecting pipeline 240 between the oil conservator 212 and the oil chamber 211 of the on-load tap-changer 210.
The processing device 230 is connected to the on-load tap-changer 210 and the sensor for collecting the baffle rotation signal of the rotation angle corresponding to the baffle 221 of the intelligent gas relay 220, and includes: one or more processors and memory. A memory is coupled to the processor for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the method of monitoring an on-load tap changer of any of the above embodiments.
In the present embodiment, the intelligent gas relay 220 is installed on the connecting pipe 240 between the conservator 212 of the on-load tap-changer 210 and the oil chamber 211 (the switching part of the on-load tap-changer 210 is located in the oil chamber 211), and the baffle rotation signal of the intelligent gas relay 220 is connected to the processing device 230. Meanwhile, voltage regulation control signals of the on-load tap-changer 210 (the on-load tap-changer 210 is provided with a voltage regulation operation mechanism box, and the on-load tap-changer 210 can remotely control the motor to operate for voltage regulation) are synchronously connected to the processing device 230.
The processing device 230 has functions of logic judgment, trip control, signal alarm, etc., and is used for controlling the overall operation of the on-load tap-changer monitoring system 200 to complete all or part of the steps of the on-load tap-changer monitoring method. The memory is used to store various types of data to support operations at the processing device 230, such data may include, for example, instructions for any application or method operating on the processing device 230, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the Processing Device 230 may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the above-mentioned method for monitoring the on-load tap changer, and achieve the technical effects consistent with the above-mentioned method.
In another exemplary embodiment, a computer readable storage medium is also provided, which comprises program instructions, which when executed by a processor, implement the steps of the method for monitoring an on-load tap changer in any of the above-mentioned embodiments. For example, the computer readable storage medium may be the above-mentioned memory including program instructions that are executable by the processing device 230 of the on-load tap changer monitoring system 200 to perform the above-mentioned on-load tap changer monitoring method and achieve a technical effect consistent with the above-mentioned method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A method of monitoring an on-load tap changer, comprising:
acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay;
determining baffle rotation energy according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period;
determining the operating state of the on-load tap-changer according to the baffle plate rotation energy;
and executing corresponding processing actions according to the running state of the on-load tap-changer.
2. The method for monitoring an on-load tap changer according to claim 1, wherein the energy of a single rotation of the shutter is selected from the group consisting of:
E＝∫θ(t)dt
wherein E represents the energy causing the baffle to act, t represents the time of a primary event causing the baffle to start rotating until the baffle returns to a zero position, and θ (t) is a function of the rotation angle of the baffle in the primary event and the time;
accumulating the energy E of the rotation within the preset time period of the baffle, specifically:
Figure FDA0002980476840000011
wherein n represents the total number of single events in the preset time period.
3. The method of monitoring an on-load tap changer of claim 2, further comprising:
when the on-load tap-changer is in a voltage regulating state, correcting the energy of the single rotation of the baffle plate according to the following formula:
E＝∫(θ(t)-2)dt。
4. the on-load tap changer monitoring method of claim 1, wherein the operating conditions of the on-load tap changer include a normal condition, an attentive condition, and a severe condition;
determining the operating state of the on-load tap-changer according to the baffle plate rotation energy, and executing corresponding processing actions according to the operating state of the on-load tap-changer, wherein the processing actions specifically comprise:
when the on-load tap-changer is determined to be in the normal state according to the baffle plate rotation energy, the on-load tap-changer is not operated;
when the on-load tap-changer is determined to be in the attention state according to the baffle plate rotation energy, selectively powering off for checking;
and when the on-load tap-changer is determined to be in the serious state according to the baffle plate rotating energy, the power failure is required to be immediately carried out for checking, and meanwhile, the voltage regulating operation is forbidden before the power failure is finished.
5. The on-load tap-changer monitoring method according to claim 4, wherein the operating state of the on-load tap-changer is determined from the baffle rotation energy, in particular:
when E is 0, determining that the on-load tap-changer is in a normal state;
when 0 < E1And 0 < ∑ E < E1Determining that the on-load tap-changer is in an attention state;
when E is2＞E＞E1Or E2＞∑E＞E1Determining that the on-load tap-changer is in a severe state;
when E > E2Or Σ E > E2When the transformer is in use, a tripping signal is sent out, and the tripping signal is used for controlling the tripping of the transformer; wherein the attention threshold for the on-load tap-changer state is E1＝1/2E0A critical value of E2＝4/5E0，E0Is the reference energy for a single rotation of the shutter.
6. The method of monitoring an on-load tap changer of claim 5, further comprising:
when the rotation of the baffle is monitored, an alarm signal is sent out immediately, and when a heavy gas action signal is sent out, the transformer is controlled to trip.
7. An on-load tap changer monitoring device, comprising:
the acquisition module is used for acquiring a baffle rotation signal used for determining a rotation angle corresponding to a baffle of the intelligent gas relay;
the first determining module is used for determining the rotation energy of the baffle according to the baffle rotation signal; the baffle plate rotation energy comprises energy of single rotation of the baffle plate and energy of accumulated rotation in a preset time period;
the second determination module is used for determining the running state of the on-load tap-changer according to the baffle plate rotation energy;
and the execution module is used for executing corresponding processing actions according to the running state of the on-load tap-changer.
8. The on-load tap changer monitoring device of claim 7, wherein the operating conditions of the on-load tap changer include a normal condition, an attentive condition, and a critical condition;
the execution module is specifically configured to:
when the second determination module determines that the on-load tap-changer is in the normal state according to the baffle rotation energy, the second determination module does not operate;
when the second determining module determines that the on-load tap-changer is in the attention state according to the baffle rotation energy, checking for selective power failure;
when the second determining module determines that the on-load tap-changer is in the serious state according to the baffle rotation energy, the power failure needs to be immediately carried out for checking, and meanwhile, the voltage regulating operation is forbidden before the power failure is finished.
9. A monitoring system for an on-load tap changer, comprising:
an on-load tap-changer;
the intelligent gas relay is arranged on a connecting pipeline between an oil conservator and an oil chamber of the on-load tap-changer;
processing apparatus, respectively with on-load tap-changer with gather the sensor connection of the rotation angle's that intelligent gas relay's baffle corresponds rotation signal includes: one or more processors and memory coupled to the processors, the processors to store one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the on-load tap changer monitoring method of any of claims 1-6.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method of monitoring an on-load tap changer according to one of claims 1 to 6.
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