CN110646656B - In-transit grounding grid tide detection device - Google Patents

In-transit grounding grid tide detection device Download PDF

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Publication number
CN110646656B
CN110646656B CN201910653655.1A CN201910653655A CN110646656B CN 110646656 B CN110646656 B CN 110646656B CN 201910653655 A CN201910653655 A CN 201910653655A CN 110646656 B CN110646656 B CN 110646656B
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singlechip
switch
grounding
port
equivalent
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CN110646656A (en
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石文江
李剑华
阴晓光
高文雅
李四光
慈建斌
宁新才
洪一云
刁桓
桓哲
陈兴元
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
    • 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
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G01R21/07—Arrangements for measuring electric power or power factor by measuring current and voltage in circuits having distributed constants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current

Abstract

The invention discloses a load flow detection device of an in-transit grounding network, which consists of a singlechip IC1, a display output module IC2, a sampling current transformer CT1, a lead, a battery, a jointing clamp and a divider resistor, wherein a far-end grounding point 1n and a near-end grounding point 2n of the in-transit grounding network are respectively connected into the device through the lead and the jointing clamp, the single chip microcomputer IC1 responds to the measurement interrupt service request generated by the key double switch K1 and in the measurement interrupt request service program of the single chip microcomputer, the opening and closing of the electronic switch K2 are controlled through an IO1 port, the open-circuit voltage and the short-circuit current between 1n and 2n are measured through AD1 and AD2 ports, calculating the equivalent resistance, the equivalent current and the equivalent power between the 1n grounding points and the 2n grounding points according to thevenin theorem and the norton theorem, the single chip microcomputer is communicated with the display output module through a serial port, and sends a measuring result and receives a user set value.

Description

In-transit grounding grid tide detection device
Technical Field
The invention relates to a tidal current detection device for an in-transit grounding grid, and belongs to the technical field of automatic measuring instruments.
Background
In the work of communication intermittent fault troubleshooting, resistance, current and passing power between two equipment grounds are often required to be measured, a special grounding resistance tester and a clamp ammeter are adopted for measurement in the prior art, the equipment is heavy and inconvenient to use, and the grounding resistance tester can inject alternating current into a target loop when in measurement or starting up, so that the grounding resistance tester cannot be easily used on a grounding wire of key equipment, and can only detect the grounding resistance of one point of a grounding network but cannot measure the equivalent resistance and the equivalent current between two points of the grounding network. The universal meter is a tool commonly equipped by operation and maintenance personnel of power enterprises, can conveniently measure electrical parameters such as voltage, current and the like in a target circuit, but cannot be used for measuring resistance with current. For example, a 2k Ω resistance with 2.5mA is measured at the 20k Ω tap of the multimeter, resulting in: the red meter pen is connected with the positive electrode of the resistor, the black meter pen is connected with the negative electrode of the resistor, and the measurement result is infinite (display 1); polarity reversal measurement, also infinite (display-1); the resistance voltage was 5.05V. For another example, a 2k Ω resistor with 0.085mA is measured at the 20k Ω position of the multimeter, and the result is: the red meter pen is connected with the positive electrode of the resistor, the black meter pen is connected with the negative electrode of the resistor, and the measurement result is 162.23k omega; the polarity is reversed, the measurement result is-122.39 k omega, and the resistance voltage is 0.17V. Therefore, it is urgently needed to develop a device for measuring equivalent resistance, current and flowing power between two points of the grounding grid in operation, and the device can undoubtedly greatly improve the field work efficiency of operation and maintenance personnel.
Disclosure of Invention
In order to solve the above problems, the present invention provides an in-transit grounding grid power flow detection device, including: the positive pole of the battery is connected with Vcc of the singlechip IC1 and is used for supplying power to the singlechip IC 1; the long lead is wound on the line stick, the movable end of the long lead is connected with a jointing clamp, the jointing clamp connected with the movable end of the long lead in use is connected with a far-end grounding point 1n, and the non-movable end of the long lead is connected with a wiring terminal 3 n; the other is a short wire, the movable end of the short wire is connected with the other jointing clamp, the jointing clamp connected with the movable end of the short wire is connected with a near-end grounding point 2n when in use, and the non-movable end of the short wire is connected with a wiring terminal 4 n; the IO1 port of singlechip IC1, singlechip IC1 is used for being connected with electronic switch K2 and controlling opening and closing of electronic switch K2, and the AD1 port of singlechip IC1 is connected to divider resistor R1And R2Between the common terminal and the divider resistor R1One end of the voltage dividing resistor R is connected with a connecting terminal 3n1The other end of (1) and a voltage dividing resistor R2Is connected with one end of a voltage dividing resistor R2The other end of the three-phase grounding switch is grounded, an AD1 port is used for measuring open-circuit voltage between a far-end grounding point 1n and a near-end grounding point 2n, an AD2 port of a single chip microcomputer IC1 is connected with the same-name end of a secondary coil of a sampling current transformer CT1, an AD2 port is used for measuring short-circuit current between the far-end grounding point 1n and the near-end grounding point 2n, an interrupt IRQ1 port of the single chip microcomputer IC1 is connected with one end of one switch in a key double switch K1 and used for responding to an interrupt request sent by the key double switch K1, the other end of one switch in the key double switch K1 is grounded, one end of the other switch in the key double switch K1 is connected with a wiring terminal 3n, the other end of the other switch in the key double switch K1 is connected with one end of an electronic switch K2, and the electronic switch K2 is connected with the other end of the other switchThe other end of the switch K2 is connected with the end with the same name of the primary coil of the sampling current transformer CT 1; the sampling current transformer CT1 is used for converting the current flowing into the wiring terminal 3n through the jointing clamp of the long lead into a voltage signal which can be directly collected by the singlechip IC 1; and the display output module IC2 is connected with the singlechip IC1 through a serial port, and is used for displaying and outputting the measurement results of the equivalent resistance, the equivalent current and the equivalent power between the grounding points 1n and 2n to be tested, and receiving the parameter setting and the operation request of a user.
In a preferable mode, the ground pin of the single chip microcomputer IC1, the ground pin of the display output module, the non-dotted terminal of the primary coil of the sampling current transformer CT1, and the non-dotted terminal of the secondary coil are connected and grounded together.
In a preferred mode, the method for measuring the equivalent resistance, the equivalent current and the equivalent power between the 1n grounding point and the 2n grounding point comprises the following steps:
s1: the key double switch K1 and the electronic switch K2 are put in a closed position, the meter pen of the multimeter is respectively connected with the jointing clamp connected with the movable end of the long lead and the jointing clamp connected with the movable end of the short lead, and the internal resistance R of the device is measured0Will reduce the internal resistance R0The parameters are input into the singlechip IC1 through the display input module IC2 for calculation; when the long conductor is replaced, the internal resistance R of the device is measured again0Inputting the data into the singlechip IC1, and then placing the key double switch K1 and the electronic switch K2 in a separating position;
s2: pulling the long lead out of the line rod to a far-end grounding point 1n, connecting a jointing clamp connected with the movable end of the long lead with the far-end grounding point 1n, and then connecting a jointing clamp connected with the movable end of the short lead with a near-end grounding point 2 n;
s3: and (3) placing the key double switch K1 in an on position, responding to the interrupt generated by the key double switch K1 by the singlechip IC1 and executing an interrupt service program: firstly, the IO1 port of the singlechip IC1 outputs high level to control the electronic switch K2 to be switched off, and the singlechip IC1 measures the open-circuit voltage U between the far-end grounding point 1n and the near-end grounding point 2n through the AD1 portsAnd recording; then the IO1 port of the singlechip IC1 is connectedWhen the voltage goes low, the electronic switch K2 is controlled to be closed, and the singlechip IC1 measures the short-circuit current I through the AD2 port0And recording; finally calculating the equivalent resistance R between 1n and 2nsThe formula is Rs＝Us/I0-R0(ii) a Calculating the equivalent current I between 1n and 2nsThe calculation formula Is that Is equal to Us/Rs(ii) a Calculating the equivalent power P between 1n and 2nsThe calculation formula is Ps＝Us*Is；
S4: the singlechip IC1 outputs R to the display output module IC2 through a serial ports、Is、PsThe numerical value of (c).
The invention has the advantages of convenient use and accurate and reliable measuring result in the work of measuring the equivalent resistance, the equivalent current and the equivalent power between any two points on the grounding network.
Drawings
FIG. 1 is a diagram of an equivalent circuit of Thevenin's theorem in the power flow detection of an operation grounding network;
FIG. 2 is a diagram of the equivalent circuit of the Noton theorem in the power flow detection of the grounding grid;
fig. 3 is a schematic structural diagram of a power flow detection device in a grounding grid;
fig. 4 is a schematic circuit diagram of a power flow detection device in a ground grid.
Detailed Description
As shown in fig. 3 and 4, the power flow detection device in the operation and grounding network of the present invention includes: the positive pole of the battery is connected with Vcc of the singlechip IC1 and is used for supplying power to the singlechip IC 1; the long lead is wound on the line stick, the movable end of the long lead is connected with a jointing clamp, the jointing clamp connected with the movable end of the long lead in use is connected with a far-end grounding point 1n, and the non-movable end of the long lead is connected with a wiring terminal 3 n; the other is a short wire, the movable end of the short wire is connected with the other jointing clamp, the jointing clamp connected with the movable end of the short wire is connected with a near-end grounding point 2n when in use, and the non-movable end of the short wire is connected with a wiring terminal 4 n; the IO1 port of singlechip IC1, singlechip IC1 is used for with electronThe switch K2 is connected with and controls the on-off of the electronic switch K2, and the AD1 port of the singlechip IC1 is connected to the divider resistor R1And R2Between the common terminal and the divider resistor R1One end of the voltage dividing resistor R is connected with a wiring terminal 3n1The other end of (1) and a voltage dividing resistor R2Is connected with one end of a voltage dividing resistor R2The other end of the two-way switch K1 is grounded, an AD1 port is used for measuring open-circuit voltage between a far-end grounding point 1n and a near-end grounding point 2n, an AD2 port of a single-chip microcomputer IC1 and a dotted end of a secondary coil of a sampling current transformer CT1 are connected together, an AD2 port is used for measuring short-circuit current between the far-end grounding point 1n and the near-end grounding point 2n, an interruption IRQ1 port of the single-chip microcomputer IC1 is connected with one end of one switch in a key two-way switch K1 and used for responding to an interruption request sent by the key two-way switch K1, the other end of one switch in the key two-way switch K1 is grounded, one end of the other switch in the two-way switch K1 is connected with a wiring terminal 3n, the other end of the primary side switch in the key two-way switch K1 is connected with one end of an electronic switch K2, and the other end of the electronic switch K2 is connected with the dotted end of the sampling current transformer CT 1; the sampling current transformer CT1 is used for converting the current flowing into the wiring terminal 3n through the jointing clamp of the long lead into a voltage signal which can be directly collected by the singlechip IC 1; and the display output module IC2 is connected with the singlechip IC1 through a serial port, and is used for displaying and outputting measurement results such as equivalent resistance, equivalent current, equivalent power and the like between the grounding points 1n and 2n to be tested, and receiving parameter setting and operation requests of users. And a grounding pin of the singlechip IC1, a grounding pin of the display output module, a non-dotted terminal of a primary coil and a non-dotted terminal of a secondary coil of the sampling current transformer CT1 are connected and grounded together.
The sampling current transformer CT1 is composed of two coils wound on the same iron core, the primary coil has 2 turns, and the secondary coil has 4000 turns.
The display output module IC2 can adopt at least one of a liquid crystal panel, a Bluetooth serial port, a USB-to-serial port chip and the like, the display output module IC2 in the embodiment adopts the Bluetooth serial port chip and is connected with the IC1 through a serial port, and the display output module IC2 is used for outputting measurement results such as equivalent resistance, equivalent current, equivalent power and the like between the grounding points 1n and 2n to be tested to the matched intelligent mobile phone APP software for display and can receive parameter setting and operation requests issued by the mobile phone APP software.
Electronic switch K2 can be at least one of them such as relay, field effect transistor, and electronic switch selects the relay for use in this example, electronic switch K2 by IO port IO1 direct control of singlechip divides and shuts, and its normally open contact inserts the circuit, and electronic switch K2 is closed when IO1 exports the low level, and K1 is the artifical button double switch of spring.
As shown in fig. 1 and fig. 2, the equivalent resistance, the equivalent current, and the power passing through between the 1n and 2n grounding points are calculated according to thevenin's theorem and norton's theorem, and the IC1 sends the measurement result to the IC2 through the serial port. When the key double switch K1 and the electronic switch K2 are both in the on-position, a universal meter can be used for measuring the resistance R of the device from 1n and 2n0，R0Is input into the IC1 through the IC2 and is used as a calculation parameter. The specific measurement steps are as follows:
s1: the key double switch K1 and the electronic switch K2 are put in a closed position, the meter pen of the multimeter is respectively connected with the jointing clamp connected with the movable end of the long lead and the jointing clamp connected with the movable end of the short lead, and the internal resistance R of the device is measured0Will reduce the internal resistance R0The parameters are input into the singlechip IC1 through the display input module IC2 for calculation; when the long conductor is replaced, the internal resistance R of the device is measured again0Inputting the data into the singlechip IC1, and then placing the key double switch K1 and the electronic switch K2 in a separating position;
s2: pulling the long lead out of the line rod to a far-end grounding point 1n, connecting a jointing clamp connected with the movable end of the long lead with the far-end grounding point 1n, and then connecting a jointing clamp connected with the movable end of the short lead with a near-end grounding point 2 n;
s3: and (3) placing the key double switch K1 in an on position, responding to the interrupt generated by the key double switch K1 by the singlechip IC1 and executing an interrupt service program: firstly, the IO1 port of the singlechip IC1 outputs high level to control the electronic switch K2 to be switched off, and the singlechip IC1 measures the on/off between the far-end grounding point 1n and the near-end grounding point 2n through the AD1 portLine voltage UsAnd recording; then the IO1 port of the singlechip IC1 outputs low level to control the electronic switch K2 to be closed, and the singlechip IC1 measures the short-circuit current I through the AD2 port0And recording; finally calculating the equivalent resistance R between 1n and 2nsThe calculation formula is Rs＝Us/I0-R0(ii) a Calculating the equivalent current I between 1n and 2nsThe calculation formula Is that Is equal to Us/Rs(ii) a Calculating the equivalent power P between 1n and 2nsThe calculation formula is Ps＝Us*Is；
S4: the singlechip IC1 outputs R to the display output module IC2 through a serial ports、Is、PsThe numerical value of (c).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (2)

1. The utility model provides an at fortune grounding net trend detection device which characterized in that includes: the positive pole of the battery is connected with Vcc of the singlechip IC1 and is used for supplying power to the singlechip IC 1; the long lead is wound on the line stick, the movable end of the long lead is connected with a jointing clamp, the jointing clamp connected with the movable end of the long lead in use is connected with a far-end grounding point 1n, and the non-movable end of the long lead is connected with a wiring terminal 3 n; the other is a short wire, the movable end of the short wire is connected with the other jointing clamp, the jointing clamp connected with the movable end of the short wire is connected with a near-end grounding point 2n when in use, and the non-movable end of the short wire is connected with a wiring terminal 4 n; the IO1 port of singlechip IC1, singlechip IC1 is used for being connected with electronic switch K2 and controlling opening and closing of electronic switch K2, and the AD1 port of singlechip IC1 is connected to divider resistor R1And R2Between the common terminal and the divider resistor R1One end of the voltage dividing resistor R is connected with a connecting terminal 3n1The other end and partial pressure ofResistance R2Is connected with one end of a voltage dividing resistor R2The other end of the two-way switch K1 is grounded, an AD1 port is used for measuring open-circuit voltage between a far-end grounding point 1n and a near-end grounding point 2n, an AD2 port of a single-chip microcomputer IC1 and a dotted end of a secondary coil of a sampling current transformer CT1 are connected together, an AD2 port is used for measuring short-circuit current between the far-end grounding point 1n and the near-end grounding point 2n, an interruption IRQ1 port of the single-chip microcomputer IC1 is connected with one end of one switch in a key two-way switch K1 and used for responding to an interruption request sent by the key two-way switch K1, the other end of one switch in the key two-way switch K1 is grounded, one end of the other switch in the two-way switch K1 is connected with a wiring terminal 3n, the other end of the primary side switch in the key two-way switch K1 is connected with one end of an electronic switch K2, and the other end of the electronic switch K2 is connected with the dotted end of the sampling current transformer CT 1; the sampling current transformer CT1 is used for converting the current flowing into the wiring terminal 3n through the jointing clamp of the long lead into a voltage signal which can be directly collected by the singlechip IC 1; the display output module IC2 is connected with the singlechip IC1 through a serial port and is used for connecting the equivalent resistance R between the grounding points 1n and 2n to be testedsEquivalent current IsEquivalent power PsThe measurement result is displayed and data is output, and the parameter setting and operation request of a user can be received;
measuring the equivalent resistance R between 1n and 2n ground pointssEquivalent current IsEquivalent power PsThe method comprises the following steps:
s1: the key double switch K1 and the electronic switch K2 are arranged in a closed position, a meter pen of a multimeter is respectively connected with a connecting clamp connected with the movable end of the long lead and a connecting clamp connected with the movable end of the short lead, and the internal resistance R of the grounding grid in operation and the internal resistance R of the grounding grid tide detecting device are measured0Internal resistance R0The parameters are input into the singlechip IC1 through the display output module IC2 for calculation; when the long lead is replaced, measuring the internal resistance R of the in-transit grounding grid tide detection device again0Inputting the data into the singlechip IC1, and then placing the key double switch K1 and the electronic switch K2 in a separating position;
s2: pulling the long lead out from the lead roller to a far-end grounding point 1n, connecting a jointing clamp connected with the movable end of the long lead with the far-end grounding point 1n, and connecting a jointing clamp connected with the movable end of the short lead with a near-end grounding point 2 n;
s3: and (3) placing the key double switch K1 in an on position, responding to the interrupt generated by the key double switch K1 by the singlechip IC1 and executing an interrupt service program: firstly, the IO1 port of the singlechip IC1 outputs high level to control the electronic switch K2 to be switched off, and the singlechip IC1 measures the open-circuit voltage U between the far-end grounding point 1n and the near-end grounding point 2n through the AD1 portsAnd recording; then the IO1 port of the singlechip IC1 outputs low level to control the electronic switch K2 to be closed, and the singlechip IC1 measures the short-circuit current I through the AD2 port0And recording; finally calculating the equivalent resistance R between 1n and 2nsThe formula is Rs＝Us/I0-R0(ii) a Calculating the equivalent current I between 1n and 2nsThe calculation formula is Is＝Us/Rs(ii) a Calculating the equivalent power P between 1n and 2nsThe calculation formula is Ps＝Us*Is；
S4: the singlechip IC1 outputs an equivalent resistor R to the display output module IC2 through a serial portsEquivalent current IsEquivalent power PsThe numerical value of (c).
2. The grounding grid current detection device of claim 1, wherein a grounding pin of the single chip microcomputer IC1, a grounding pin of the display output module, a non-homonymous terminal of a primary coil of the sampling current transformer CT1, and a non-homonymous terminal of a secondary coil are connected and commonly grounded.
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