CN112147549A - Transformer substation current transformer polarity testing device based on single chip microcomputer - Google Patents
Transformer substation current transformer polarity testing device based on single chip microcomputer Download PDFInfo
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- CN112147549A CN112147549A CN202011044354.8A CN202011044354A CN112147549A CN 112147549 A CN112147549 A CN 112147549A CN 202011044354 A CN202011044354 A CN 202011044354A CN 112147549 A CN112147549 A CN 112147549A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The invention discloses a single-chip microcomputer-based transformer substation current transformer polarity testing device, which comprises a wiring terminal, a voltage division circuit module, an AD conversion module, a main controller, a display module and a power supply module, wherein the wiring terminal is used for connecting a CT secondary winding; the binding post is connected with a CT secondary winding of the transformer substation and is used for collecting current of a CT end of the transformer substation; the binding post is electrically connected with the input end of the voltage division circuit module; the input end of the AD conversion module is electrically connected with the output end of the voltage division circuit module; the output end of the AD conversion module is electrically connected with the input end of the main controller; the main controller is electrically connected with the input end of the display module; and the power supply module provides required working power supply for the AD conversion module, the main controller and the display module respectively. The invention can effectively improve the sensitivity of testing the CT polarity and obviously improve the testing efficiency.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a transformer substation current transformer polarity testing device based on a single chip microcomputer.
Background
When a transformer substation is subjected to replacement or major repair technology improvement such as a Current Transformer (CT), a switch terminal box and a protection measurement and control device of primary equipment, current rising and CT polarity tests are required, and for the CT polarity tests, the deviation of a pointer is observed by using a current pointer meter when a direct-current power supply is added for two times at one time, so that whether the CT meets the polarity reduction requirement is analyzed and judged.
However, in actual operation, when the storage battery is used for dot polarity, the current converted to the secondary loop may be small, in the order of μ a, due to the large time constant of the primary loop, and it is difficult to determine the polarity by observing the swing of the pointer of the ammeter. Therefore, the deflection of the pointer meter with low sensitivity is not obvious, and the adoption of the pointer meter with high sensitivity can cause the induced current to exceed the measuring range of the pointer meter and even burn out the ammeter, so that the traditional method has the problems of incapability of obviously judging the polarity, low efficiency and low speed.
Chinese patent publication No.: CN104133154A, published: 2014-11-05, discloses a polarity testing method and device for a current transformer of an intelligent substation, and the method comprises the following steps: performing cyclic cache processing on secondary side data of the current transformer of the intelligent substation, extracting data in a delta T time period before the polarity test of a direct current method is started, and calculating filtered data to be used as a background data reference of the polarity test; after the delta T time period, adopting filtered data to perform discrimination comparison with a background data reference, and identifying the polarity of the current transformer; and original data before and after the polarity result is stored, so that the post analysis is convenient. However, this method has the disadvantages of being computationally complex and the device being expensive to manufacture.
Disclosure of Invention
The invention provides a single chip microcomputer-based transformer substation current transformer polarity testing device, which can effectively improve the sensitivity of testing CT polarity and remarkably improve the testing efficiency, and aims to solve the problems that the traditional method cannot obviously judge the polarity, is low in efficiency and is slow in speed.
In order to achieve the purpose of the invention, the technical scheme is as follows: a single-chip microcomputer-based polarity testing device for a current transformer of a transformer substation comprises two binding posts for connecting a CT secondary winding, a voltage division circuit module, an AD conversion module, a main controller, a display module and a power supply module;
the binding post is connected with a CT secondary winding of the transformer substation and is used for collecting current of a CT end of the transformer substation;
the binding post is electrically connected with the input end of the voltage division circuit module;
the input end of the AD conversion module is electrically connected with the output end of the voltage division circuit module;
the output end of the AD conversion module is electrically connected with the input end of the main controller;
the main controller is electrically connected with the input end of the display module;
and the power supply module provides required working power supply for the AD conversion module, the main controller and the display module respectively.
The invention collects the current information of the CT secondary winding of the transformer substation through the binding post for connecting the CT secondary winding, and the binding post changes the collected mu A current into U through the voltage division circuit moduleiThen outputs U through AD conversion moduleoVoltage of V class;
when the CT of the transformer substation is under the polarity reducing state, the main controller samples positive voltage, and displays that the CT is under the polarity reducing state on the display module, otherwise, the CT is under the polarity increasing state.
According to the invention, the acquired analog signals are converted into digital signals through the AD converter, so that the accuracy is improved, the sensitivity of CT polarity is effectively tested, and the testing efficiency is obviously improved.
Furthermore, the intelligent control system also comprises an operation indicator lamp module, wherein the input end of the operation indicator lamp module is used for being connected with the wiring terminal.
Still further, the operation indicator lamp module comprises a starting switch K1, a transformer, a zener diode ZD1, a zener diode ZD2, a zener diode ZD3, a zener diode ZD4, a capacitor C6, a three-terminal regulator integrated circuit, a capacitor C7, a capacitor C8, a resistor R9, and a light emitting diode D1;
the starting switch K1 and one end of the transformer are connected with the two wiring terminals in series;
the input end of the three-end voltage-stabilizing integrated circuit is respectively connected with the output end of the voltage-stabilizing diode ZD1, the output end of the voltage-stabilizing diode ZD2 and one end of a capacitor C6;
the input end of the voltage stabilizing diode ZD1 is connected with the output end of the voltage stabilizing diode ZD 3;
the input end of the voltage stabilizing diode ZD2 is connected with the output end of the voltage stabilizing diode ZD 4;
the input end of the voltage stabilizing diode ZD3, the input end of the voltage stabilizing diode ZD4 and the other end of the capacitor C6 are all connected with the grounding end of the three-terminal voltage stabilizing integrated circuit;
the pin A at the other end of the transformer is connected between the voltage stabilizing diode ZD1 and the voltage stabilizing diode ZD 3;
the pin B at the other end of the transformer is connected between the voltage stabilizing diode ZD2 and the voltage stabilizing diode ZD 4;
the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a capacitor C7 and a capacitor C8;
meanwhile, the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a resistor R9 and a light-emitting diode D1 in sequence; and the output end of the three-end voltage-stabilizing integrated circuit is connected with the output end of the power supply module.
Still further, the voltage dividing module comprises a resistor R1 and a resistor R2; the resistor R1 and the resistor R2 are connected in series, and one end of the resistor R1 is connected with one of the binding posts; the other end of the resistor R2 is connected with a binding post; the input end of the AD conversion module is connected between the resistor R1 and the resistor R2.
Furthermore, the testing device also comprises a key module; the key module is used for being electrically connected with the main controller.
Still further, the key module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a key K1, a key K2, a key K3 and a key K4;
one end of the key K1 is grounded, and the other end of the key K1 is connected with an IO1 pin of the main controller;
one end of the key K2 is grounded, and the other end of the key K2 is connected with an IO2 pin of the main controller;
one end of the key K3 is grounded, and the other end of the key K3 is connected with an IO3 pin of the main controller;
one end of the key K4 is grounded, and the other end of the key K4 is connected with an IO4 pin of the main controller;
one end of the resistor R1 is connected between the key K1 and an IO1 pin of the main controller, and the other end of the resistor R1 is connected with a power supply VCC;
one end of the resistor R2 is connected between the key K2 and an IO2 pin of the main controller, and the other end of the resistor R2 is connected with a power supply VCC;
one end of the resistor R3 is connected between the key K3 and an IO3 pin of the main controller, and the other end of the resistor R3 is connected with a power supply VCC;
one end of the resistor R4 is connected between the key K4 and the IO4 pin of the main controller, and the other end of the resistor R4 is connected with a power supply VCC.
Still further, the testing device also comprises a light emitting module; the light-emitting module is electrically connected with the main controller, and when the CT of the transformer substation is under the polarity reduction state, the main controller controls the light-emitting module to emit light.
Still further, testing arrangement WIFI module still, WIFI module and main control unit electric connection.
Still further, the display module adopts a 12864 liquid crystal display module.
Still further, the main controller comprises one of an STC89C52 singlechip and an STC89C51 singlechip.
The invention has the following beneficial effects:
the invention collects the current information of the CT secondary winding of the transformer substation through the binding post, and changes the collected mu A current into U through the voltage division circuit moduleiThen outputs U through AD conversion moduleoVoltage of V class; according to the invention, the acquired analog signals are converted into digital signals through the AD converter, so that the accuracy is improved, the sensitivity of testing the CT polarity is effectively improved, and the testing efficiency is obviously improved.
Drawings
Fig. 1 is a block diagram of a circuit configuration of the test apparatus described in this embodiment 1.
Fig. 2 is a circuit diagram of the operation indicator lamp module according to embodiment 1.
Fig. 3 is a circuit connection diagram of the AD conversion module, the voltage dividing circuit module and the CT secondary winding in this embodiment 1.
Fig. 4 is a circuit connection diagram of the key module, the display module, the WIFI module and the main controller described in this embodiment 1.
Fig. 5 is an external structural view of the test apparatus according to embodiment 1.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in figure 1, the polarity testing device for the current transformer of the transformer substation based on the single chip microcomputer comprises two binding posts (S1 and S2) for connecting a CT secondary winding, a voltage division circuit module, an AD conversion module, a main controller, a display module and a power supply module
The binding post is connected with a CT secondary winding of the transformer substation and is used for collecting current of a CT end of the transformer substation;
the binding post is electrically connected with the input end of the voltage division circuit module;
the input end of the AD conversion module is electrically connected with the output end of the voltage division circuit module;
the output end of the AD conversion module is electrically connected with the input end of the main controller;
the main controller is electrically connected with the input end of the display module;
and the power supply module provides required working power supply for the AD conversion module, the main controller and the display module respectively.
According to the invention, through the binding post for connecting the CT secondary winding, as shown in figure 2, the current information of the CT secondary winding of the transformer substation is acquired, and the acquired muA current is changed into U through the voltage division circuit module by the binding postiIn the mV order ofThen outputs U through AD conversion moduleoVoltage of V class;
when the CT of the transformer substation is under the polarity reducing state, the main controller samples positive voltage, and displays that the CT is under the polarity reducing state on the display module, otherwise, the CT is under the polarity increasing state.
According to the invention, the acquired analog signals are converted into digital signals through the AD converter, so that the accuracy is improved, the sensitivity of testing the CT polarity is effectively improved, and the testing efficiency is obviously improved.
In a specific embodiment, in order to facilitate observing the operation state of the testing device, the testing device further comprises an operation indicator lamp module, and an input end of the operation indicator lamp module is used for being connected with the wiring terminal. The operation indicator lamp module comprises a starting switch K1, a transformer, a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD3, a voltage stabilizing diode ZD4, a capacitor C6, a three-terminal voltage stabilizing integrated circuit, a capacitor C7, a capacitor C8, a resistor R9 and a light emitting diode D1;
the starting switch K1 and one end of the transformer are connected with the two wiring terminals in series;
the input end of the three-end voltage-stabilizing integrated circuit is respectively connected with the output end of the voltage-stabilizing diode ZD1, the output end of the voltage-stabilizing diode ZD2 and one end of a capacitor C6;
the input end of the voltage stabilizing diode ZD1 is connected with the output end of the voltage stabilizing diode ZD 3;
the input end of the voltage stabilizing diode ZD2 is connected with the output end of the voltage stabilizing diode ZD 4;
the input end of the voltage stabilizing diode ZD3, the input end of the voltage stabilizing diode ZD4 and the other end of the capacitor C6 are all connected with the grounding end of the three-terminal voltage stabilizing integrated circuit;
the pin A at the other end of the transformer is connected between the voltage stabilizing diode ZD1 and the voltage stabilizing diode ZD 3;
the pin B at the other end of the transformer is connected between the voltage stabilizing diode ZD2 and the voltage stabilizing diode ZD 4;
the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a capacitor C7 and a capacitor C8;
meanwhile, the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a resistor R9 and a light-emitting diode D1 in sequence; and the output end of the three-end voltage-stabilizing integrated circuit is connected with the output end of the power supply module.
In the specific application of the embodiment, the output section of the secondary winding of the CT of the substation is connected with the binding post, the start switch K1 is pressed, if the light emitting diode D1 is always turned on at this time, the polarity reduction of the CT is correct, and if the LED is not turned on after the wire is connected, the polarity of the CT is reversed, so as to determine the polarity.
In a specific embodiment, as shown in fig. 3, the voltage dividing module includes a resistor R1, a resistor R2; the resistor R1 and the resistor R2 are connected in series, and one end of the resistor R1 is connected with one of the binding posts; the other end of the resistor R2 is connected with a binding post; the input end of the AD conversion module is connected between the resistor R1 and the resistor R2. The voltage division circuit module is used for controlling the voltage within an application range so as to prevent the chip from being damaged by overlarge sampling voltage. The AD conversion module adopts an ADC0809 chip to simulate the input voltage range of 0 to +5V, so that the acquisition accuracy can be effectively improved.
In a specific embodiment, the testing device further comprises a key module; the key module is used for being electrically connected with the main controller. As shown in fig. 4, the key module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a key K1, a key K2, a key K3, and a key K4;
one end of the key K1 is grounded, and the other end of the key K1 is connected with a P1.0 pin of the main controller;
one end of the key K2 is grounded, and the other end of the key K2 is connected with a P1.1 pin of the main controller;
one end of the key K3 is grounded, and the other end of the key K3 is connected with a P1.2 pin of the main controller;
one end of the key K4 is grounded, and the other end of the key K4 is connected with a P1.3 pin of the main controller;
one end of the resistor R1 is connected between the key K1 and the P1.0 pin of the main controller, and the other end of the resistor R1 is connected with a power supply VCC;
one end of the resistor R2 is connected between the key K2 and a P1.1 pin of the main controller, and the other end of the resistor R2 is connected with a power supply VCC;
one end of the resistor R3 is connected between the key K3 and a P1.2 pin of the main controller, and the other end of the resistor R3 is connected with a power supply VCC;
one end of the resistor R4 is connected between the key K4 and the P1.3 pin of the main controller, and the other end of the resistor R4 is connected with a power supply VCC.
The embodiment is provided with four keys, the size of the threshold value is set through the key module, and when the detected current signal is larger than the threshold value, an alarm can be displayed on the display module. The size of the threshold value can be set according to actual use through the key module.
In a specific embodiment, the testing device further comprises a light emitting module; the light-emitting module is electrically connected with the main controller, and when the CT of the transformer substation is under the polarity reduction state, the main controller controls the light-emitting module to emit light. The light emitting module comprises a Light Emitting Diode (LED) and a resistor R8, and the specific connection is as shown in FIG. 4.
In a specific embodiment, in order to facilitate monitoring of the testing device by technicians at any time, the testing device further comprises a WIFI module, and the WIFI module is electrically connected with the main controller. The detected data and the data processed by the main controller are sent to the intelligent terminal through the WIFI module, and the intelligent terminal is used for monitoring by workers at any time. The intelligent terminal comprises a PC, a notebook computer, an intelligent mobile phone, an ipad and the like.
In a specific embodiment, the display module is a 12864 liquid crystal display module. The specific current is shown in fig. 4. When the CT of the transformer substation is under the polarity reduction state, the main controller samples positive voltage, the main controller sends an instruction to control the light emitting diode to emit light, and the CT is under the polarity reduction state and the CT is under the polarity addition state on the 12864 liquid crystal screen, otherwise, the CT is under the polarity addition state.
In a specific embodiment, the main controller comprises one of an STC89C52 single chip microcomputer and an STC89C51 single chip microcomputer.
As shown in fig. 5, the testing device further includes a box body, a light emitting diode D1 is arranged on the outer surface of the box body as an operation indicator lamp, a start switch K1, a reset switch K2, an LED lamp in the light emitting module, a terminal S1, a terminal S2, and a grounding pole N for grounding. In practical application, a grounding wire is connected into the terminal N according to the field, and one end of the secondary winding is connected with the terminal S1 and the other end of the secondary winding is connected with the terminal S2.
This embodiment has overcome the tradition and has used two people of dry battery cooperation extravagant manpower, time and the inaccurate drawback of measuring accuracy, and this embodiment has reduced on-the-spot manpower and test time resource, makes whole test process swift more and simple, and in addition, this product is small, light in weight, portable, the cost of manufacture is low, and sensitivity is very high.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a transformer substation's current transformer polarity testing arrangement based on singlechip which characterized in that: the CT secondary winding voltage divider comprises two binding posts for connecting a CT secondary winding, a voltage dividing circuit module, an AD conversion module, a main controller, a display module and a power supply module;
the binding post is connected with a CT secondary winding of the transformer substation and is used for collecting current of a CT end of the transformer substation;
the binding post is electrically connected with the input end of the voltage division circuit module;
the input end of the AD conversion module is electrically connected with the output end of the voltage division circuit module;
the output end of the AD conversion module is electrically connected with the input end of the main controller;
the main controller is electrically connected with the input end of the display module;
and the power supply module provides required working power supply for the AD conversion module, the main controller and the display module respectively.
2. The single-chip microcomputer-based substation current transformer polarity testing device of claim 1, characterized in that: the wiring terminal converts the acquired mu A current into U through the voltage division circuit moduleiThen outputs U through AD conversion moduleoVoltage of V class;
when the CT of the transformer substation is under the polarity reducing state, the main controller samples positive voltage, and displays that the CT is under the polarity reducing state on the display module, otherwise, the CT is under the polarity increasing state.
3. The single-chip microcomputer-based substation current transformer polarity testing device of claim 2, characterized in that: the operation indicator lamp module is characterized by further comprising an operation indicator lamp module, wherein the input end of the operation indicator lamp module is used for being connected with the wiring terminal.
4. The single-chip microcomputer-based substation current transformer polarity testing device of claim 3, characterized in that: the operation indicator lamp module comprises a starting switch K1, a transformer, a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD3, a voltage stabilizing diode ZD4, a capacitor C6, a three-terminal voltage stabilizing integrated circuit, a capacitor C7, a capacitor C8, a resistor R9 and a light emitting diode D1;
the starting switch K1 and one end of the transformer are connected with the two binding posts in series;
the input end of the three-end voltage-stabilizing integrated circuit is respectively connected with the output end of the voltage-stabilizing diode ZD1, the output end of the voltage-stabilizing diode ZD2 and one end of a capacitor C6;
the input end of the voltage stabilizing diode ZD1 is connected with the output end of the voltage stabilizing diode ZD 3;
the input end of the voltage stabilizing diode ZD2 is connected with the output end of the voltage stabilizing diode ZD 4;
the input end of the voltage stabilizing diode ZD3, the input end of the voltage stabilizing diode ZD4 and the other end of the capacitor C6 are all connected with the grounding end of the three-terminal voltage stabilizing integrated circuit;
the pin A at the other end of the transformer is connected between the voltage stabilizing diode ZD1 and the voltage stabilizing diode ZD 3;
the pin B at the other end of the transformer is connected between the voltage stabilizing diode ZD2 and the voltage stabilizing diode ZD 4;
the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a capacitor C7 and a capacitor C8;
meanwhile, the output end of the three-terminal voltage-stabilizing integrated circuit is connected with the grounding end of the three-terminal voltage-stabilizing integrated circuit through a resistor R9 and a light-emitting diode D1 in sequence; and the output end of the three-end voltage-stabilizing integrated circuit is connected with the output end of the power supply module.
5. The single-chip microcomputer-based substation current transformer polarity testing device of claim 4, characterized in that: the voltage division module comprises a resistor R1 and a resistor R2; the resistor R1 and the resistor R2 are connected in series, and one end of the resistor R1 is connected with one of the binding posts; the other end of the resistor R2 is connected with a binding post; the input end of the AD conversion module is connected between the resistor R1 and the resistor R2.
6. The single-chip microcomputer-based substation current transformer polarity testing device of claim 5, characterized in that: the testing device also comprises a key module; the key module is used for being electrically connected with the main controller.
7. The single-chip microcomputer-based substation current transformer polarity testing device of claim 6, characterized in that: the key module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a key K1, a key K2, a key K3 and a key K4;
one end of the key K1 is grounded, and the other end of the key K1 is connected with an IO1 pin of the main controller;
one end of the key K2 is grounded, and the other end of the key K2 is connected with an IO2 pin of the main controller;
one end of the key K3 is grounded, and the other end of the key K3 is connected with an IO3 pin of the main controller;
one end of the key K4 is grounded, and the other end of the key K4 is connected with an IO4 pin of the main controller;
one end of the resistor R1 is connected between the key K1 and an IO1 pin of the main controller, and the other end of the resistor R1 is connected with a power supply VCC;
one end of the resistor R2 is connected between the key K2 and an IO2 pin of the main controller, and the other end of the resistor R2 is connected with a power supply VCC;
one end of the resistor R3 is connected between the key K3 and an IO3 pin of the main controller, and the other end of the resistor R3 is connected with a power supply VCC;
one end of the resistor R4 is connected between the key K4 and the IO4 pin of the main controller, and the other end of the resistor R4 is connected with a power supply VCC.
8. The single-chip microcomputer-based substation current transformer polarity testing device of claim 7, characterized in that: the testing device also comprises a light emitting module; the light-emitting module is electrically connected with the main controller, and when the CT of the transformer substation is under the polarity reduction state, the main controller controls the light-emitting module to emit light.
9. The single-chip microcomputer-based substation current transformer polarity testing device of claim 8, characterized in that: the testing device is also provided with a WIFI module, and the WIFI module is electrically connected with the main controller.
10. The single-chip microcomputer-based substation current transformer polarity testing device of claim 9, characterized in that: the display module adopts a 12864 liquid crystal display module.
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| CN202011044354.8A CN112147549A (en) | 2020-09-28 | 2020-09-28 | Transformer substation current transformer polarity testing device based on single chip microcomputer |
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| CN202011044354.8A CN112147549A (en) | 2020-09-28 | 2020-09-28 | Transformer substation current transformer polarity testing device based on single chip microcomputer |
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| CN109143143A (en) * | 2018-10-19 | 2019-01-04 | 天生桥二级水力发电有限公司天生桥水力发电总厂 | Transformer substation current transformer secondary side polarity intelligent detection device and method |
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- 2020-09-28 CN CN202011044354.8A patent/CN112147549A/en active Pending
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| CN101581443A (en) * | 2008-12-23 | 2009-11-18 | 李孝杰 | Flameproof intrinsically safe LED illuminating lamp with unlimited output power |
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Application publication date: 20201229 |
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