阅读说明：本技术 一种变压器档位智能监控方法及系统 (Intelligent monitoring method and system for transformer gear ) 是由 董青迅 杨红权 程华 刘翔宇 刘鑫 胡祥胜 曾晓维 谭智馨 赵博 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种变压器档位智能监控方法及系统,本发明中,变压器每调整一档,主变高低压侧电压比变化值为固定数值,将实际电压比变化值与理论值比较作为变压器档位控制系统调压机构的切换开关是否切换到位的判据,可以有效自动监控到切换开关是否切换到位,本发明能有效避免变压器档位假切换现象,解决了变压器存在的因有载调压机构奇偶切换开关机构卡涩,连续调档使调压机构拉弧放电而导致非电量保护动作的问题,确保电网平稳运行。(The invention discloses a transformer gear intelligent monitoring method and a system, wherein when a transformer adjusts one gear, the voltage ratio change value of a main transformer high-low voltage side is a fixed numerical value, the actual voltage ratio change value is compared with a theoretical value to be used as a criterion for judging whether a change-over switch of a voltage regulating mechanism of a transformer gear control system is switched in place, and whether the change-over switch is switched in place can be effectively and automatically monitored.)

1. The intelligent monitoring method for the transformer gears is characterized by comprising the following steps of: the method comprises the following steps:

the method comprises the steps of collecting main transformer high-voltage side voltage and low-voltage side voltage before and after gear position change, calculating a voltage ratio of a main transformer high-voltage side voltage value Uh1 and a low-voltage side voltage value Ul1 before the gear position change, calculating a voltage ratio of a main transformer high-voltage side voltage value Uh2 and a low-voltage side voltage value Ul2 after the gear position change, obtaining a difference value of the two voltage ratios before and after the gear position change, comparing the difference value with a voltage ratio change theoretical value, and judging whether a change switch of a voltage regulating mechanism of the transformer gear control system is switched in place or not according to a comparison result.

2. The intelligent monitoring method for the transformer gear according to claim 1, characterized in that: and when the voltage ratio delta 1-delta 2 is less than the voltage ratio change theoretical value, the change switch of the voltage regulating mechanism is judged not to be switched in place.

3. The intelligent monitoring method for the transformer gear according to claim 1, characterized in that: the method further comprises the steps of: and when the change-over switch of the voltage regulating mechanism is not switched in place, outputting a locking signal to lock the voltage regulating mechanism.

4. The intelligent monitoring method for the transformer gear according to claim 3, characterized in that: the method further comprises the steps of: when the locking signal is not finished, the transformer gear control system receives the gear shifting signal again, the locking is judged to be failed, a tripping loop of the transformer gear control system is started, switches on two sides of the main transformer act, and the load is cut off.

5. The intelligent monitoring method for the transformer gear according to claim 1, characterized in that: the method further comprises the steps of: and acquiring and reading gear signals of the gear selection switch.

6. An intelligent transformer gear monitoring system based on the intelligent transformer gear monitoring method of any one of claims 1-5, comprising an intelligent monitoring terminal, and is characterized in that: the intelligent monitoring terminal comprises a processor, a voltage acquisition circuit module and a voltage regulating mechanism control signal output circuit, wherein the voltage acquisition circuit module and the voltage regulating mechanism control signal output circuit are connected with the processor;

the voltage acquisition circuit module is connected with a main transformer high-voltage side voltage end and a main transformer low-voltage side voltage end of the transformer gear control system to acquire main transformer high-voltage side voltage and main transformer low-voltage side voltage before and after gear position change;

the voltage regulating mechanism control signal output circuit is connected with a voltage regulating mechanism locking signal end of the transformer gear control system, and when the condition that a change-over switch of the voltage regulating mechanism of the transformer gear control system is not switched in place is judged, the voltage regulating mechanism control signal output circuit outputs a locking signal to the voltage regulating mechanism locking signal end of the transformer gear control system to lock the voltage regulating mechanism;

the processor is also connected with a measurement and control device of the transformer gear control system and transmits the gear signal to the measurement and control device.

7. The intelligent transformer gear monitoring system according to claim 6, wherein: the output end of the processor is also connected with a tripping loop, the processor outputs an alarm signal when a change-over switch of the voltage regulating mechanism of the transformer gear control system is not switched in place, when the signal of the voltage regulating mechanism is not locked and the transformer gear control system receives the gear regulating signal again, the locking is judged to be failed, the tripping loop of the transformer gear control system is started, and switches on two sides of a main transformer act to cut off the load.

8. The intelligent transformer gear monitoring system according to claim 6, wherein: the processor is also connected with an LCD display circuit.

9. The intelligent transformer gear monitoring system according to claim 6, wherein: the voltage acquisition circuit module comprises a voltage acquisition circuit and a metering chip, wherein the voltage acquisition circuit is composed of a voltage transformer connected with a high-voltage side voltage end and a low-voltage side voltage end of the main transformer, the metering chip is connected with the voltage acquisition circuit, and the metering chip is connected with the processor.

10. The intelligent transformer gear monitoring system according to claim 6, wherein: the intelligent monitoring terminal also comprises a BCD code conversion circuit module, a BCD code signal output circuit and a memory which are connected with the processor;

the BCD code conversion circuit module is connected with a gear signal end of the gear selection switch to convert the gear signal into a BCD code;

the BCD code signal output circuit is connected with a measurement and control device of the transformer gear control system.

Technical Field

The invention belongs to the technical field of power system measurement, and particularly relates to a transformer gear intelligent monitoring method and system.

Background

The current transformer gear remote signaling monitoring mode widely used by substations at home and abroad is that a gear monitoring function is completed by three-level signal transmission through a transformer on-load voltage regulating mechanism, a BCD encoder and a measurement and control device, a gear monitoring field wiring diagram is shown in figure 2, the transformer realizes passive input of a gear tap, the voltage regulating mechanism and the BCD encoder are connected through a 19-core cable, and the BCD encoder is connected with the measurement and control device through a 6-core cable. When the voltage regulating mechanism acts, the position of a primary side tap of the transformer can change, an input diode coding matrix is converted into a BCD code by a BCD coder, and the BCD code outputs a gear, so that the mechanical position is converted into a digital signal, and the digital signal is transmitted to a main gear measurement and control device through a signal loop to display the gear position of the voltage regulating mechanism. The schematic diagram of the gear switching inside the voltage regulating mechanism is shown in fig. 2, after the transformer voltage regulating mechanism receives a gear switching remote signal, a gear selection switch in the mechanism firstly performs gear selection, and after the gear is determined, an odd-even change switch acts, so that the position change of a primary side tap of the transformer voltage regulating mechanism is realized.

However, in the actual gear monitoring process, the transformer has the problem that the non-electric quantity protection action is caused by the fact that the voltage regulating mechanism is subjected to arc discharge due to continuous gear shifting because the odd-even change-over switch mechanism of the on-load voltage regulating mechanism is jammed. The reason is that in the first gear shifting process, the gear selection switch acts firstly, and because the odd-even change-over switch mechanism is jammed, the change-over switch does not act, and the measurement and control device collects the position of the gear selection switch and judges that the gear is switched completely; the transformer carries out the second gear shifting, and odd-even change over switch still is in initial contact position, and gear selection switch secondary action selects the gear, is similar to the load and draws the switch, and the selection switch area load current draws open, leads to drawing the arc and discharges to produce the oil stream and rush the heavy gas clamp plate of body and lead to tripping operation. Therefore, if the odd-even change-over switch of the transformer cannot be correctly monitored whether the change-over is successful or not in the gear voltage regulating process, and the internal fault of the voltage regulating mechanism cannot be timely found, the transformer may suddenly act due to continuous gear regulation, and the safe and stable operation of the power grid is influenced.

Disclosure of Invention

The invention aims to: the method and the system for monitoring the transformer gear solve the problems that whether the odd-even change-over switch mechanism successfully switches the gear or not can not be correctly monitored and the false switching phenomenon caused by internal faults of a voltage regulating mechanism can not be timely found by adopting a mode of remote signaling monitoring of the transformer gear and judging by acquiring gear coding signals of a gear selection switch in the conventional transformer gear monitoring.

The technical scheme adopted by the invention is as follows:

an intelligent monitoring method for transformer gears comprises the following steps:

the method comprises the steps of collecting main transformer high-voltage side voltage and low-voltage side voltage before and after gear position change, calculating a voltage ratio of a main transformer high-voltage side voltage value Uh1 and a low-voltage side voltage value Ul1 before the gear position change, calculating a voltage ratio of a main transformer high-voltage side voltage value Uh2 and a low-voltage side voltage value Ul2 after the gear position change, obtaining a difference value of the two voltage ratios before and after the gear position change, comparing the difference value with a voltage ratio change theoretical value, and judging whether a change switch of a voltage regulating mechanism of the transformer gear control system is switched in place or not according to a comparison result.

Further, the voltage ratio Δ 1 before the gear position is changed is Uh1/Ul1, the voltage ratio Δ 2 after the gear position is changed is Uh2/Ul2, and when | Δ 1- Δ 2| < the voltage ratio change theoretical value, it is determined that the change-over switch of the voltage regulating mechanism is not switched in place.

Further, the method comprises the following steps: and when the change-over switch of the voltage regulating mechanism is not switched in place, outputting a locking signal to lock the voltage regulating mechanism.

Further, the method comprises the following steps: when the locking signal is not finished, the transformer gear control system receives the gear shifting signal again, the locking is judged to be failed, a tripping loop of the transformer gear control system is started, switches on two sides of the main transformer act, and the load is cut off.

Further, the method comprises the following steps: and acquiring and reading gear signals of the gear selection switch.

The intelligent transformer gear monitoring system based on the intelligent transformer gear monitoring method comprises an intelligent monitoring terminal, wherein the intelligent monitoring terminal comprises a processor, a voltage acquisition circuit module and a voltage regulating mechanism control signal output circuit, the voltage acquisition circuit module and the voltage regulating mechanism control signal output circuit are connected with the processor:

the voltage acquisition circuit module is connected with a main transformer high-voltage side voltage end and a main transformer low-voltage side voltage end of the transformer gear control system to acquire main transformer high-voltage side voltage and main transformer low-voltage side voltage before and after gear position change;

the voltage regulating mechanism control signal output circuit is connected with a voltage regulating mechanism locking signal end of the transformer gear control system, and when the condition that a change-over switch of the voltage regulating mechanism of the transformer gear control system is not switched in place is judged, the voltage regulating mechanism control signal output circuit outputs a locking signal to the voltage regulating mechanism locking signal end of the transformer gear control system to lock the voltage regulating mechanism;

the processor is also connected with a measurement and control device of the transformer gear control system and transmits the gear signal to the measurement and control device.

Furthermore, the output end of the processor is also connected with a tripping circuit, when the signal of the voltage-regulating locking mechanism does not end, the transformer gear control system receives the gear-regulating signal again, the locking is judged to be failed, the tripping circuit of the transformer gear control system is started, the switches on the two sides of the main transformer act, and the load is cut off.

Further, the processor is also connected with an LCD display circuit.

Furthermore, the voltage acquisition circuit module comprises a voltage acquisition circuit and a metering chip, wherein the voltage acquisition circuit is formed by a voltage transformer connected with a high-voltage side voltage end and a low-voltage side voltage end of the main transformer, the metering chip is connected with the voltage acquisition circuit, and the metering chip is connected with the processor.

Furthermore, the intelligent monitoring terminal also comprises a BCD code conversion circuit module, a BCD code signal output circuit and a memory which are connected with the processor;

the BCD code conversion circuit module is connected with a gear signal end of the gear selection switch to convert the gear signal into a BCD code;

the BCD code signal output circuit is connected with a measurement and control device of the transformer gear control system.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. in the invention, when the transformer is adjusted to one gear, the voltage ratio change value of the high-voltage side and the low-voltage side is a fixed numerical value, the actual voltage ratio change value is compared with a theoretical value to be used as a criterion for judging whether a change-over switch of a voltage regulating mechanism of a transformer gear control system is switched in place, and whether the change-over switch is switched in place can be effectively and automatically monitored.

2. According to the invention, whether the voltage regulating mechanism is locked or not is automatically judged, and an alarm signal is sent, so that the safety of the transformer is protected. Meanwhile, a tripping loop is arranged, if the blocking signal is not finished, the system receives the gear shifting signal again, the blocking failure is judged, the tripping loop is started, the switches on the two sides of the main transformer act, the load is cut off, the voltage regulating mechanism is prevented from being further damaged, and the safety of the transformer is further protected.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic diagram of the internal gear shifting of the gear monitoring and pressure regulating mechanism in the background art of the present invention;

FIG. 3 is a schematic diagram of a processor circuit according to the present invention;

FIG. 4 is a schematic circuit diagram of a voltage acquisition circuit module according to the present invention;

FIG. 5 is a schematic circuit diagram of a BCD code conversion circuit module according to the present invention;

FIG. 6 is a schematic diagram of a remote signaling interface connection circuit according to the present invention;

FIG. 7 is a schematic diagram of a memory circuit according to the present invention;

FIG. 8 is a schematic diagram of a BCD code signal output circuit voltage regulating mechanism control signal output circuit of the present invention;

FIG. 9 is a schematic diagram of a process of calculating a variation of a voltage ratio of the high and low sides of the main transformer before and after a gear position is changed according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.

In the invention, when the transformer is adjusted to one gear, the voltage ratio change value of the high-voltage side and the low-voltage side is a fixed numerical value, the actual voltage ratio change value is compared with a theoretical value to be used as a criterion for judging whether a change-over switch of a voltage regulating mechanism of a transformer gear control system is switched in place, and whether the change-over switch is switched in place can be effectively and automatically monitored.

The features and properties of the present invention are described in further detail below with reference to examples.