CN112857286A - Non-electric quantity protection method and system of on-load tap-changer based on vibration displacement information - Google Patents
Non-electric quantity protection method and system of on-load tap-changer based on vibration displacement information Download PDFInfo
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- CN112857286A CN112857286A CN202110008405.XA CN202110008405A CN112857286A CN 112857286 A CN112857286 A CN 112857286A CN 202110008405 A CN202110008405 A CN 202110008405A CN 112857286 A CN112857286 A CN 112857286A
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- timer
- load tap
- changer
- vibration displacement
- vibration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention relates to a vibration displacement information-based on-load tap-changer non-electric quantity protection method, which comprises the following steps: the vibration sensor obtains the vibration displacement x of the on-load tap-changer within the set interval delta tOLTC(ii) a Judging whether x is satisfiedOLTC≥x1If the first timer is not satisfied, setting the first timer to zero, and stopping timing; judging whether x is satisfiedOLTC≥x2If the first timer is not satisfied, setting the first timer to zero, and stopping timing; judging whether x is satisfiedOLTC≥x3If the first timer is not satisfied, the third timer is set to zero and stops timing. The invention also discloses a vibration displacement information-based on-load tap-changer non-electric quantity protection system. The invention is provided withThe method and the device effectively prevent misoperation when the on-load tap-changer is normally switched, accurately act when internal faults occur in the on-load tap-changer oil chamber, and have good speed.
Description
Technical Field
The invention relates to the technical field of protection of oil-immersed transformers, in particular to a vibration displacement information-based on-load tap-changer non-electric quantity protection method and system.
Background
The on-load tap-changer for the transformer is important equipment for stabilizing the load center voltage, connecting a power grid, adjusting load flow and improving reactive power distribution, and the reliable operation of the on-load tap-changer is directly related to the stability of a system. The on-load tap-changer has a separate oil chamber, the change-over switch completes the switching of the transformer tap in the oil chamber, realizes the transfer of current and reliably extinguishes the arc in insulating oil, but the on-load tap-changer is used as a mechanical part of the transformer which rapidly runs under high voltage and heavy current, and the frequent switching is needed to realize the voltage regulation when the load fluctuates, so that the faults of poor contact, improper action and the like are easy to occur. The phenomenon of continuous heating or continuous electric arc under the fault condition causes the vaporization and decomposition of the insulating oil, the insulating oil can be rushed to an oil conservator due to gas expansion and rising, and meanwhile, the quality of the insulating oil is reduced, so that the normal operation of the on-load tap-changer is directly influenced.
At present, the on-load tap-changer of the transformer is mainly provided with non-electric protection of a pressure release valve, an explosion-proof membrane and gas protection, wherein the pressure release valve and the explosion-proof membrane are pressure sensitive protection, along with the increase of the capacity of the transformer, when the transformer runs under heavy load, the switching current under the normal switching condition of the on-load tap-changer is larger, the fluctuation range of the pressure in an oil chamber is large, and the possibility of misoperation of the pressure release valve is caused.
The gas protection reflecting the oil flow surging is a non-electric quantity protection type mainly used by the existing on-load tap-changer, and long-term operation practice shows that the internal fault of the on-load tap-changer of the transformer can be better discriminated by utilizing the flow speed characteristic of insulating oil in an oil conservator connecting pipe. However, the gas relay used at present still continues the basic principle and mechanical structure of the Buchholz relay for centuries, and the protection fixed value is an empirical value summarized in long-term operation. In the long-term use process of the on-load tap changer, a large amount of oil sludge is separated out due to the fact that oxides fall off and insulating oil is degraded, once the oil sludge is attached to mechanical components such as a gas protection baffle, a floater or a spring, the accuracy and flexibility of the action of an electric appliance are seriously affected, a heavy gas detection mechanism consisting of the mechanical baffle and the spring can only measure a single index of oil flow velocity, the operation state is discriminated only according to the single index of the flow velocity, and the gas protection can be judged wrongly. The on-load tap-changer can generate obvious and continuous oil flow surging under the normal operation switching condition, the oil flow surging conditions under different load currents are different, particularly, when a large-capacity transformer runs under heavy load, the current is large under the normal operation switching condition of the on-load tap-changer, the caused oil flow rate is large, the gas protection experience value suitable for the on-load tap-changer of the transformer with smaller capacity is larger than that before, and protection misoperation is caused. The existing mechanical gas protection is increasingly difficult to meet the requirement of the on-load tap-changer for the high-capacity transformer on the protection reliability. According to the practical operation experience of engineering and related reports, cases of gas protection maloperation of on-load tap-changer for a plurality of high-capacity transformers have appeared.
Disclosure of Invention
The invention mainly aims to provide a vibration displacement information-based on-load tap-changer non-electric quantity protection method which can quickly measure the vibration displacement of an on-load tap-changer, output digital criterion information and compare with a setting value to make quick judgment so as to quickly isolate faults.
In order to achieve the purpose, the invention adopts the following technical scheme: a vibration displacement information-based on-load tap-changer non-electric quantity protection method comprises the following steps:
the vibration sensor obtains the vibration displacement x of the on-load tap-changer within the set interval delta tOLTC；
Digital vibration relay judges whether x is satisfiedOLTC≥x1If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x2If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x3If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
the first timer, the second timer and the third timer are mutually independent;
x1is a first speed threshold value, x2Is the second speed threshold, x3Is a third speed threshold;
the time setting values of the first timer, the second timer and the third timer are respectively
When the timing duration of any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
x1＜x2＜x3。
Another object of the present invention is to provide a vibration displacement information-based on-load tap-changer non-electrical protection system, comprising:
the vibration sensor is used for measuring the vibration displacement of the on-load tap-changer;
the digital vibration relay is used for receiving an output signal of the vibration sensor and comparing the vibration displacement with a displacement setting value; comparing the timing duration of each timer with a time setting value, and outputting a protective action command according to a threshold comparison result after the threshold comparison is finished;
wherein the first timer is the timer with the longest timing time and is used for recording that the vibration displacement is maintained to be larger than x1The duration of the state of (a);
a second timer for counting the next longer time for recording that the vibration displacement is maintained to be greater than x2The duration of the state of (a);
a third timer for recording the vibration displacement and keeping the vibration displacement larger than x3The duration of the state of (a);
when any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
x1＜x2＜x3。
According to the technical scheme, the beneficial effects of the invention are as follows: firstly, the vibration displacement of the on-load tap-changer needs to be measured continuously in real time by a vibration sensor, and speed information is transmitted to a digital vibration relay; secondly, the digital vibration relay judges whether the protection acts or not according to a setting value of vibration displacement-time matching, and determines delay action time; thirdly, the invention can reliably protect the operation of the on-load tap-changer, determine the action delay of the protection according to the setting value of the vibration displacement-time matching, effectively prevent the false action when the on-load tap-changer is normally switched, and simultaneously accurately act when the internal fault occurs in the on-load tap-changer oil chamber, and has good speed.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic view of the installation position of the vibration sensor in the present invention;
fig. 3 is a schematic diagram of the setting value of the vibration displacement-time of the present invention.
Detailed Description
As shown in fig. 1 and 2, a method for non-electric quantity protection of an on-load tap-changer based on vibration displacement information includes:
the vibration sensor 1 obtains the vibration displacement x of the on-load tap-changer within the set interval delta tOLTC；
Digital vibration relay judges whether x is satisfiedOLTC≥x1If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x2If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x3If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
the first timer, the second timer and the third timer are mutually independent;
x1is a first speed threshold value、x2Is the second speed threshold, x3Is a third speed threshold;
the time setting values of the first timer, the second timer and the third timer are respectively
When the timing duration of any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
x1＜x2＜x3。
The system comprises:
the vibration sensor 1 is used for measuring the vibration displacement of the on-load tap-changer;
the digital vibration relay is used for receiving an output signal of the vibration sensor 1, has a vibration displacement signal threshold value comparison function and compares vibration displacement with a displacement setting value; the system has a timing and time threshold comparison function, compares the timing duration of each timer with a time setting value, and outputs a protection action command according to a threshold comparison result after the threshold comparison is finished;
a first timer for recording the vibration displacement and keeping the vibration displacement greater than x1The duration of the state of (a);
a second timer for counting the next longer time for recording that the vibration displacement is maintained to be greater than x2The duration of the state of (a);
a third timer for recording the vibration displacement and keeping the vibration displacement larger than x3The duration of the state of (a);
when any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
The invention is further described below with reference to fig. 1 to 3.
The fault of the on-load tap-changer is judged based on the vibration displacement amplitude, and the more serious the vibration displacement exceeds the standard, the more serious the fault is considered, and the faster the action is; because the on-load tap-changer is a moving part and has certain vibration during normal work switching, the vibration degree is reasonably graded, and meanwhile, the malfunction caused by normal switching is avoided and protected by combining the action delay of the time.
The overall action logic is that the displacement setting value is in three stages, the smaller the displacement setting value is, the longer the action time is corresponding to the smaller the displacement setting value is, and the shorter the action time delay is corresponding to the larger the displacement setting value is; when the vibration displacement exceeds the setting value of the displacement of which stage, the timer of which stage starts timing, and when the vibration displacement exceeds the setting value of multiple stages, the timers of multiple stages start timing; if the vibration displacement does not reach the displacement setting value of a certain stage, the setting value of the stage is continuously set to zero; if the accumulated time of the shift of a certain stage exceeds the standard is less than the time setting value of the timer of the stage, the protection is returned, and the timer of the stage is set to zero; and (4) the timer of any one stage of protection reaches the setting time of the stage, and the protection acts.
Fig. 2 is a schematic diagram of the installation position of the vibration sensor 1, and the vibration displacement sensor is installed on both the side edges of the oil chamber top cover and the top cover of the change-over switch of the on-load tap-changer.
In summary, for the on-load tap-changer, the internal fault and the normal switching of the on-load tap-changer can be effectively distinguished by setting the reasonable vibration displacement setting value and the time setting value. When the on-load tap-changer is normally switched, misoperation can be effectively prevented; when the transformer has an internal fault, the transformer can reliably act.
Claims (6)
1. A vibration displacement information-based on-load tap-changer non-electric quantity protection method is characterized by comprising the following steps: the method comprises the following steps:
the vibration sensor obtains the vibration displacement x of the on-load tap-changer within the set interval delta tOLTC；
Digital vibration relay judges whether x is satisfiedOLTC≥x1If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x2If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
digital vibration relay judges whether x is satisfiedOLTC≥x3If the first timer is not satisfied, setting the first timer to zero, and stopping timing;
the first timer, the second timer and the third timer are mutually independent;
x1is a first speed threshold value, x2Is the second speed threshold, x3Is a third speed threshold;
the time setting values of the first timer, the second timer and the third timer are respectively
When the timing duration of any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
2. The on-load tap-changer non-electrical protection method based on vibration displacement information as claimed in claim 1, characterized in that: x is the number of1＜x2＜x3。
3. The on-load tap-changer non-electrical protection method based on vibration displacement information as claimed in claim 1, characterized in that:
4. a system of a vibration displacement information-based on-load tap-changer non-electric quantity protection method is characterized in that: the method comprises the following steps:
the vibration sensor is used for measuring the vibration displacement of the on-load tap-changer;
the digital vibration relay is used for receiving an output signal of the vibration sensor and comparing the vibration displacement with a displacement setting value; comparing the timing duration of each timer with a time setting value, and outputting a protective action command according to a threshold comparison result after the threshold comparison is finished;
wherein the first timer is the timer with the longest timing time and is used for recording that the vibration displacement is maintained to be larger than x1The duration of the state of (a);
a second timer for counting the next longer time for recording that the vibration displacement is maintained to be greater than x2The duration of the state of (a);
a third timer for recording the vibration displacement and keeping the vibration displacement larger than x3The duration of the state of (a);
when any one of the three timers reaches the time setting value, the protection action is carried out, and the breaker trips.
5. The system of claim 4, wherein: x is the number of1＜x2＜x3。
6. The system of claim 4, wherein:
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110008405.XA CN112857286A (en) | 2021-01-05 | 2021-01-05 | Non-electric quantity protection method and system of on-load tap-changer based on vibration displacement information |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110008405.XA CN112857286A (en) | 2021-01-05 | 2021-01-05 | Non-electric quantity protection method and system of on-load tap-changer based on vibration displacement information |
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| CN202110008405.XA Pending CN112857286A (en) | 2021-01-05 | 2021-01-05 | Non-electric quantity protection method and system of on-load tap-changer based on vibration displacement information |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445654A (en) * | 2011-09-16 | 2012-05-09 | 山西省电力公司运城供电分公司 | On-line monitor for mechanical characteristic of on-load tap-changer of power transformer |
| CN104362736A (en) * | 2014-09-17 | 2015-02-18 | 特变电工衡阳变压器有限公司 | Intelligent component cabinet and monitoring method for intelligent transformer |
| CN104897267A (en) * | 2015-05-07 | 2015-09-09 | 国家电网公司 | On-line monitoring device for vibration signals of on-load tap changer |
| CN104898046A (en) * | 2015-05-07 | 2015-09-09 | 国家电网公司 | On-line monitoring device for on-load tap changer |
| CN205565893U (en) * | 2016-03-28 | 2016-09-07 | 国网江西省电力公司赣州供电分公司 | On -load tap -changer on -line monitoring system of transformer |
| CN109856501A (en) * | 2019-01-13 | 2019-06-07 | 广西电网有限责任公司南宁供电局 | A kind of on-load tap changers of transformers and winding deformation fault detection method |
| CN109904842A (en) * | 2019-02-28 | 2019-06-18 | 西安交通大学 | The digital protection method of oil-immersed transformer based on oil stream velocity characteristic |
-
2021
- 2021-01-05 CN CN202110008405.XA patent/CN112857286A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445654A (en) * | 2011-09-16 | 2012-05-09 | 山西省电力公司运城供电分公司 | On-line monitor for mechanical characteristic of on-load tap-changer of power transformer |
| CN104362736A (en) * | 2014-09-17 | 2015-02-18 | 特变电工衡阳变压器有限公司 | Intelligent component cabinet and monitoring method for intelligent transformer |
| CN104897267A (en) * | 2015-05-07 | 2015-09-09 | 国家电网公司 | On-line monitoring device for vibration signals of on-load tap changer |
| CN104898046A (en) * | 2015-05-07 | 2015-09-09 | 国家电网公司 | On-line monitoring device for on-load tap changer |
| CN205565893U (en) * | 2016-03-28 | 2016-09-07 | 国网江西省电力公司赣州供电分公司 | On -load tap -changer on -line monitoring system of transformer |
| CN109856501A (en) * | 2019-01-13 | 2019-06-07 | 广西电网有限责任公司南宁供电局 | A kind of on-load tap changers of transformers and winding deformation fault detection method |
| CN109904842A (en) * | 2019-02-28 | 2019-06-18 | 西安交通大学 | The digital protection method of oil-immersed transformer based on oil stream velocity characteristic |
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