CN110658377A - Voltage secondary opening triangular loop monitoring device - Google Patents
Voltage secondary opening triangular loop monitoring device Download PDFInfo
- Publication number
- CN110658377A CN110658377A CN201911013790.6A CN201911013790A CN110658377A CN 110658377 A CN110658377 A CN 110658377A CN 201911013790 A CN201911013790 A CN 201911013790A CN 110658377 A CN110658377 A CN 110658377A
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- China
- Prior art keywords
- current
- induction coil
- threshold value
- loop
- alarm threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
Abstract
The invention discloses a voltage secondary open triangular loop monitoring device, and relates to the field of electric power operation and maintenance. The invention adds an induction coil on each phase of the three-phase loop, three induction coils measure the current in the loop in real time, the induction coil I, the induction coil II and the induction coil III are connected with an amplifying element to amplify the current, the amplifying element is connected with a logic judging element to display the amplified current on a display screen, an alarm threshold value is set according to the current measured in advance, when the measured current is less than a certain percentage of the alarm threshold value or more than 50 times of the alarm threshold value in monitoring, the node is closed, an alarm indicator lamp is lightened, and the current is transmitted to a node or a public measurement and control center through a line, so that the control center takes operation. The invention improves the working efficiency of operation and maintenance personnel and ensures the safe and stable operation of the transformer substation.
Description
Technical Field
The invention relates to the field of electric power operation and maintenance, in particular to a voltage secondary open triangular loop monitoring device.
Background
In the daily operation of a transformer substation, a secondary voltage opening triangular loop plays an important role, is mainly used for insulation check, and is also used for external zero-sequence voltage of main transformer protection, and whether the loop is normal or not has great influence on the safety and stability of the transformer substation. However, when the system normally operates, the loop has no voltage or very small voltage, and whether the loop is normal or not cannot be effectively judged, so that great invariance is brought to operation and maintenance personnel. Therefore, a device capable of monitoring the secondary open triangular loop of the voltage is needed to meet the requirement of insulation inspection in the daily operation of the transformer substation.
Disclosure of Invention
The invention provides a voltage secondary open triangular loop monitoring device, which aims to solve the problem that whether a voltage secondary open triangular loop normally operates or not in the daily operation of a transformer substation.
The invention is realized by the following technical scheme: a voltage secondary opening triangle loop monitoring device is characterized in that each phase of a three-phase loop is additionally provided with an induction coil, wherein an induction coil I is connected in series with an A phase, an induction coil II is connected in series with a B phase, an induction coil III is connected in series with a C phase, the three induction coils measure the current in the loop in real time, the induction coils I, II and III are connected with an amplifying element to amplify the current, the amplifying element is connected with a logic judgment element to display the amplified current on a display screen, an alarm threshold value is set according to the current measured in advance, when the current measured in monitoring is less than a certain percentage of the alarm threshold value or more than 50 times of the alarm threshold value, the loop is abnormal in operation, at the moment, a node is closed, an alarm indicator lamp is lightened, and the current is transmitted to a previous node or a common measurement and control center through a line, causing the control center to take action.
The invention provides a voltage secondary open triangular loop monitoring device, which is characterized in that an induction coil is additionally arranged in an open triangular loop, the current in the loop is measured in real time, an amplifying element is additionally arranged because the current is very small, the amplifying element is displayed on a display screen through a logic judgment element, an alarm threshold value is set according to the current measured in advance, when the current measured in the monitoring process is lower than the alarm threshold value of a certain percentage or exceeds the alarm threshold value by more than a plurality of times, the circuit is in an abnormal operation state, the node is closed at the moment, an alarm indicator lamp is lightened, and the alarm indicator lamp is transmitted to a previous node or a public measurement and control center through a line to remind an operation and maintenance person to check the loop. The method specifically comprises the following steps: in the open triangular loop, an induction coil I, an induction coil II and an induction coil III are respectively additionally arranged on ABC three phases, the three induction coils are used for measuring the current in the loop in real time, the current is amplified through an amplifying element and then is compared with an alarm threshold value through a logic judgment element, if the current is about 20mA under the normal operation condition, a display screen displays the monitoring current, if the monitoring current value is possibly completely absent or exceeds the threshold value by more than 50 times under the abnormal operation condition, after the logic judgment element judges the operation state, if the operation state is the abnormal operation state, the node is closed, an alarm indicator lamp is lightened, the line abnormality of nearby workers is reminded, and the alarm indicator lamp is transmitted to the upper node or a public measurement and control center through the line to remind the operation and maintenance personnel to check the loop.
Compared with the prior art, the invention has the following beneficial effects: the voltage secondary open triangular loop monitoring device provided by the invention judges whether the loop is normal or not by monitoring the current in the loop, improves the working efficiency of operation and maintenance personnel, and ensures the safe and stable operation of a transformer substation.
Drawings
Fig. 1 is a schematic view of the installation position of the induction coil according to the present invention.
Fig. 2 is a schematic structural diagram of the present invention, and arrows represent connecting lines.
The figures are labeled as follows: 1-induction coil I, 2-induction coil II, 3-induction coil III, 4-amplifying element, 5-logic judgment element, 6-display screen, 7-alarm indicator lamp, 8-operation button, 9-public measurement and control center, and 10-box.
Detailed Description
The present invention is further illustrated by the following specific examples.
A voltage secondary open triangular loop monitoring device is characterized in that as shown in figure 1 ~ and figure 2, an induction coil is additionally arranged on each phase of a three-phase loop, wherein an induction coil I1 is connected in series on the phase A, an induction coil II 2 is connected in series on the phase B, an induction coil III 3 is connected in series on the phase C, the three induction coils measure the current in the loop in real time, the induction coil I1, the induction coil II 2 and the induction coil III 3 are connected with an amplifying element 4 to amplify the current, the amplifying element 4 is connected with a logic judgment element 5 to display the amplified current on a display screen 6, an alarm threshold value is set according to the current measured in advance, when the measured current in the monitoring is smaller than a certain percentage of the alarm threshold value or is more than or equal to 50 times of the alarm threshold value, the loop runs abnormally, the node is closed at the moment, an alarm indicator lamp 7 is lightened, and the alarm indicator lamp is transmitted to a previous node or a common measurement and control center 9 through a line, and the control center.
In the embodiment, all the parts of the monitoring device except the three induction coils are arranged in one box body 10, the surface of the box body 10 is also provided with an operation button 8, and the monitoring current is 30% ~ 50% of the alarm threshold value or more than or equal to 50 times of the alarm threshold value.
The invention has the specific operations that an induction coil I1, an induction coil II 2 and an induction coil III 3 are respectively additionally arranged on ABC three phases in an open triangular loop, the three induction coils are used for measuring the current in the loop in real time, the current is amplified through an amplifying element 4, then the current is compared with an alarm threshold value through a logic judgment element 5, a display screen 6 displays monitoring current, if the current is about 20mA under the normal operation condition, if the current is not normal, the monitoring current value may be 30% ~ 50% of the alarm threshold value or more than 50 times of the alarm threshold value, after the logic judgment element 5 judges the operation state, if the current is not normal, the node is closed, an alarm indicator lamp 7 is lightened, the alarm indicator lamp reminds nearby workers of abnormal circuit, and the alarm indicator lamp is transmitted to a node or a public measurement and control center 9 through the circuit to remind the operation and maintenance personnel of checking the loop.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (3)
1. The utility model provides a voltage secondary opening triangle return circuit monitoring devices which characterized in that: each phase of the three-phase loop is additionally provided with an induction coil, wherein an induction coil I (1) is connected in series on the phase A, an induction coil II (2) is connected in series on the phase B, an induction coil III (3) is connected in series on the phase C, the three induction coils measure the current in the loop in real time, the induction coil I (1), the induction coil II (2) and the induction coil III (3) are connected with an amplifying element (4) to amplify the current, after the amplifying element (4) is connected with a logic judgment element (5), the amplified current is displayed on a display screen (6), an alarm threshold value is set according to the current measured in advance, when the measured current in monitoring is smaller than a certain percentage of the alarm threshold value or is more than or equal to 50 times of the alarm threshold value, the loop runs abnormally, the node is closed at the moment, an indicator lamp (7) is lightened, and the current is transmitted to a node or a public measurement and control center (9) through a circuit, causing the control center to take action.
2. The apparatus according to claim 1, wherein the apparatus further comprises: all the parts of the monitoring device except the three induction coils are arranged in a box body (10), and the surface of the box body (10) is also provided with an operation button (8).
3. The apparatus of claim 1, wherein the monitoring current is 30% ~ 50% of the alarm threshold value or more than 50 times the alarm threshold value when the loop is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911013790.6A CN110658377B (en) | 2019-10-23 | 2019-10-23 | Voltage secondary opening triangular loop monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911013790.6A CN110658377B (en) | 2019-10-23 | 2019-10-23 | Voltage secondary opening triangular loop monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110658377A true CN110658377A (en) | 2020-01-07 |
| CN110658377B CN110658377B (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911013790.6A Active CN110658377B (en) | 2019-10-23 | 2019-10-23 | Voltage secondary opening triangular loop monitoring device |
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|---|---|---|---|---|
| JPH03270633A (en) * | 1990-03-19 | 1991-12-02 | Toshiba Corp | Ground relay device |
| CN101251569A (en) * | 2008-04-01 | 2008-08-27 | 山东电力研究院 | Method for testing electric secondary AC loop |
| CN101699306A (en) * | 2009-11-16 | 2010-04-28 | 许继电气股份有限公司 | Method for monitoring current acquisition circuit of electric power secondary system |
| CN101806848A (en) * | 2010-04-19 | 2010-08-18 | 河南省电力公司南阳供电公司 | Detection device for preventing mis-wiring of voltage transformer and detection method thereof |
| CN102879630A (en) * | 2012-09-17 | 2013-01-16 | 浙江省电力公司电力科学研究院 | Capacitive voltage transformer failure monitoring instrument |
| CN202916384U (en) * | 2012-09-11 | 2013-05-01 | 陈昌鹏 | Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning |
| CN104078954A (en) * | 2014-07-18 | 2014-10-01 | 国网上海市电力公司 | Zero-voltage protection warning circuit |
| CN104535956A (en) * | 2014-11-26 | 2015-04-22 | 国家电网公司 | Method for detecting wiring/polarity correctness of secondary opening delta loop of potential transformer |
| CN106066445A (en) * | 2016-06-17 | 2016-11-02 | 国网山东省电力公司莱芜供电公司 | Voltage transformer open delta circuit breaking monitoring device and application process |
| CN108051699A (en) * | 2017-11-17 | 2018-05-18 | 国网湖南省电力有限公司 | A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
-
2019
- 2019-10-23 CN CN201911013790.6A patent/CN110658377B/en active Active
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| JPH03270633A (en) * | 1990-03-19 | 1991-12-02 | Toshiba Corp | Ground relay device |
| CN101251569A (en) * | 2008-04-01 | 2008-08-27 | 山东电力研究院 | Method for testing electric secondary AC loop |
| CN101699306A (en) * | 2009-11-16 | 2010-04-28 | 许继电气股份有限公司 | Method for monitoring current acquisition circuit of electric power secondary system |
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| CN202916384U (en) * | 2012-09-11 | 2013-05-01 | 陈昌鹏 | Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning |
| CN102879630A (en) * | 2012-09-17 | 2013-01-16 | 浙江省电力公司电力科学研究院 | Capacitive voltage transformer failure monitoring instrument |
| CN104078954A (en) * | 2014-07-18 | 2014-10-01 | 国网上海市电力公司 | Zero-voltage protection warning circuit |
| CN104535956A (en) * | 2014-11-26 | 2015-04-22 | 国家电网公司 | Method for detecting wiring/polarity correctness of secondary opening delta loop of potential transformer |
| CN106066445A (en) * | 2016-06-17 | 2016-11-02 | 国网山东省电力公司莱芜供电公司 | Voltage transformer open delta circuit breaking monitoring device and application process |
| CN108051699A (en) * | 2017-11-17 | 2018-05-18 | 国网湖南省电力有限公司 | A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
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| 全先德 等: "电压互感器二次开口三角短路故障分析", 《变压器》 * |
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| CN110658377B (en) | 2021-11-09 |
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