CN210604746U

CN210604746U - In-transit grounding grid tide detection device

Info

Publication number: CN210604746U
Application number: CN201921138670.4U
Authority: CN
Inventors: 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
Original assignee: State Grid Corp of China SGCC; State Grid Liaoning Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Liaoning Electric Power Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-05-22
Anticipated expiration: 2029-07-19

Abstract

The utility model discloses a load flow detection device in operation 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 operation grounding network are respectively connected with the lead and the jointing clamp, the singlechip IC1 responds to a measurement interrupt service request generated by a key double switch K1 and controls the on-off of an electronic switch K2 through an IO1 port in a measurement interrupt request service program of the singlechip, the AD1 and the AD2 ports are used for measuring open-circuit voltage and short-circuit current between the 1n and the 2n, the equivalent resistor, the equivalent current and the equivalent power between the 1n grounding points and the 2n grounding points are calculated according to the Thevenin theorem and the Nonton theorem, the serial port is communicated with the display output module through the singlechip, sending the measurement result and receiving the 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 the singlechip IC1 and the IO1 port of the singlechip IC1 are used for being connected with the electronic switch K2 and controlling the K2 to be opened or closed, and the AD1 port of the singlechip IC1 is connected to the voltage-dividing resistor R₁And R₂BetweenThe common terminal of (1), a voltage dividing 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 R₂The other end of the divider resistor R2 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 the single chip microcomputer IC1 is connected with the same-name end of a secondary coil of the 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 interruption IRQ1 port of the single chip microcomputer IC1 is connected with one end of one switch in the key double-switch K1 and used for responding to an interruption request sent by K1, the other end of one switch of the key double-switch K1 is grounded, one end of the other switch of the key double-switch K1 is connected with a wiring terminal 3n, the other end of the other switch of the key double-switch K1 is connected with one end of the electronic switch K2, and the other end of the electronic switch K2 is connected with the; 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, is used for displaying and outputting measurement results such as equivalent resistance, flowing current, passing power and the like between the

grounding points

1n and 2n to be tested, and can receive parameter setting and operation requests of users.

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: k1 and K2 are put in a closed position, a meter pen of a multimeter is respectively connected with the connecting clamp connected with the movable end of the long lead and the connecting 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 wire is replaced, it is again usedMeasuring the internal resistance R of the inventive device₀Inputting the data into the singlechip IC1, and then placing K1 and 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 when the K1 is set to be in a closed position, the singlechip IC1 responds to the interrupt generated by the K1 and executes 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 open-circuit voltage U between a far-end grounding point 1n and a near-end grounding point 2n through an AD1 port_sAnd 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 2n_sThe calculation formula is R_s＝Us/I₀-R₀(ii) a Calculating the equivalent current I between 1n and 2n_sThe calculation formula Is that Is equal to U_s/R_s(ii) a Calculating the equivalent power P between 1n and 2n_sThe calculation formula is P_s＝U_s*I_s；

S4: the singlechip IC1 outputs R to the display output module IC2 through a serial port_s、I_s、P_sThe 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 current and the 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 the singlechip IC1 and the IO1 port of the singlechip IC1 are used for being connected with the electronic switch K2 and controlling the K2 to be opened or closed, and the AD1 port of the singlechip IC1 is connected to the voltage-dividing 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 R₂The other end of the divider resistor R2 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 the single chip microcomputer IC1 is connected with the same-name end of a secondary coil of the 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 interruption IRQ1 port of the single chip microcomputer IC1 is connected with one end of one switch in the key double-switch K1 and used for responding to an interruption request sent by K1, the other end of one switch of the key double-switch K1 is grounded, one end of the other switch of the key double-switch K1 is connected with a wiring terminal 3n, the other end of the other switch of the key double-switch K1 is connected with one end of the electronic switch K2, and the other end of the electronic switch K2 is connected with the; 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 measuring the equivalent resistance, the flowing current, the passing power and the like between the

grounding points

1n and 2n to be measuredDisplaying the fruits and outputting data, 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 between a grounding point 1n and a grounding point 2n to be tested, flowing current, passing power and the like 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 kind such as relay, field effect transistor, and electronic switch chooses for use the relay in this example, electronic switch K2 by IO port IO1 direct control deciliter of singlechip, its normally open contact access circuit, 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 K1 and K2 are both in place, a multimeter can be used to measure the resistance R of the device of the invention 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: k1 and K2 are put in a closed position, a meter pen of a multimeter is respectively connected with the connecting clamp connected with the movable end of the long lead and the connecting 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 again₀And input into the single-chip microcomputer IC1,then placing K1 and K2 in the quantile;

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

1. The utility model provides an at fortune grounding network 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 wire, the wire has two, and one is long wire, and long wire twines on the line rod, and a binding clip is connected to the expansion end of long wire, and the binding clip that the expansion end of long wire is connected during the use is connected with distal end ground point1n, and the non-movable end of the long lead is connected to a connecting 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 the singlechip IC1 and the IO1 port of the singlechip IC1 are used for being connected with the electronic switch K2 and controlling the K2 to be opened or closed, and the AD1 port of the singlechip IC1 is connected to the voltage-dividing 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 R₂The other end of the divider resistor R2 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 the single chip microcomputer IC1 is connected with the same-name end of a secondary coil of the 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 interruption IRQ1 port of the single chip microcomputer IC1 is connected with one end of one switch in the key double-switch K1 and used for responding to an interruption request sent by K1, the other end of one switch of the key double-switch K1 is grounded, one end of the other switch of the key double-switch K1 is connected with a wiring terminal 3n, the other end of the other switch of the key double-switch K1 is connected with one end of the electronic switch K2, and the other end of the electronic switch K2 is connected with the; 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, is used for displaying and outputting measurement results such as equivalent resistance, flowing current, passing power and the like between the grounding points 1n and 2n to be tested, and can receive parameter setting and operation requests of users.

2. The grounding grid current detection device of claim 1, wherein a grounding pin of the singlechip 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.