CN210665985U

CN210665985U - Insulation inspection module

Info

Publication number: CN210665985U
Application number: CN201920920205.XU
Authority: CN
Inventors: 程立明; 彭步峰; 刘军; 黄长卫; 杨旭东
Original assignee: Shengli Oil Field Shengli Electric Co ltd
Current assignee: Shengli Oil Field Shengli Electric Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-06-02
Anticipated expiration: 2029-06-19

Abstract

The utility model relates to an insulating detection technology field, and an insulating module of patrolling and examining is disclosed, including branch road, positive generating line and negative bus, be provided with balance resistance R + and R-and branch road insulation resistance RL + and RL-, establish ties between balance resistance R + and R-, parallelly connected between branch road insulation resistance RL + and the RL-. The utility model discloses a direct current balance resistance surveys method and carries out ground detection, and the rate of accuracy is high, measures accurately, adopts the mode of CAN communication, CAN be real-time tells the host computer of direct current screen with the information real-time of gathering, and various information transmission that the rethread host computer will gather reach the backstage, use direct current leakage current sensor, and acquiescence transformation ratio 10mA/5V requires to decide the perforation diameter according to the major loop line footpath. The positive and negative buses simultaneously penetrate through the current sensor, the penetrating direction of the buses is marked according to the shell of the sensor, the arrow points to the load direction, namely, the positive leakage current enables the output of the sensor to be positive, and the penetration direction is reversed, so that the leakage resistance cannot be detected systematically.

Description

Insulation inspection module

Technical Field

The utility model relates to an insulating technical field that detects specifically is an insulating module of patrolling and examining.

Background

In a dc system, grounding of one pole does not cause any harm, but long-term operation of grounding of one pole is not allowed, because when grounding occurs again at another place of the same pole, the signal device, the relay protection and control device may malfunction or fail to operate, or when grounding of the other pole occurs, the dc system is short-circuited, which causes serious consequences. Therefore, when one point of grounding of the dc system occurs, it must be found out as soon as possible for processing.

The method of pulling the circuit is generally adopted for finding the grounding point, the condition of the monitoring unit of the direct current screen is observed when one circuit is pulled, and if the warning signal disappears after a certain circuit is pulled, the grounding point of the circuit can be judged. In order to further determine, the way switch is closed again, if the alarm signal appears again, it can be judged that the way is grounded, but the method for pulling the way has the defects of low accuracy and the like when detecting.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an insulating module of patrolling and examining reaches the rate of accuracy height, measures accurate purpose.

In order to achieve the above object, the utility model provides a following technical scheme: an insulation inspection module comprises a branch, a positive bus and a negative bus, wherein balance resistors R + and R-and branch insulation resistors RL + and RL-are arranged on the branch, the balance resistors R + and R-are connected in series, the branch insulation resistors RL + and RL-are connected in parallel, a first switch K and a second switch K1 are arranged on the branch, one end of the first switch K and one end of the second switch K1 are respectively connected with the ground, two 1M resistors and two 100K resistors are arranged between the positive bus and the negative bus, the two 1M resistors are arranged in series, the two 100K resistors are arranged in series, the balance resistors R + and R-are located between the positive bus and the negative bus, a resistor RL is arranged between the positive bus and the negative bus in series, and a leakage sensor is arranged between the positive bus and the negative bus in series.

Preferably, the leakage current sensor is a direct current leakage current sensor, and the default transformation ratio is 10 mA/5V.

Preferably, the insulation resistances RL + and RL-are not equal in value.

The utility model provides an insulating module of patrolling and examining. The method has the following beneficial effects:

(1) the device adopts a direct current balance resistance detection method to carry out grounding detection, and has high accuracy and accurate measurement.

(2) The method CAN tell the host of the direct current screen in real time by using the CAN communication mode, and then sends various collected information to the background through the host.

(3) The system uses a direct current leakage current sensor, the default transformation ratio is 10mA/5V, and the perforation diameter is determined according to the requirement of the line diameter of the main loop. The positive and negative buses simultaneously penetrate through the current sensor, the penetrating direction of the buses is marked according to the shell of the sensor, the arrow points to the load direction, namely, the positive leakage current enables the output of the sensor to be positive, and the penetration direction is reversed, so that the leakage resistance cannot be detected systematically.

(4) The indicating lamp is electrified to indicate, and indicating lamp two is used for ground connection to instruct for two emitting diode, and wherein anodal ground connection shows the red light, and the green light is shown to the negative pole ground connection.

Drawings

FIG. 1 is a diagram of the detection circuit of the present invention;

fig. 2 is a system diagram of the master and slave of the present invention;

fig. 3 is a schematic structural view of the first indicator light and the second indicator light of the present invention.

In the figure: 1 slave machine one, 2 indicator light one, 3 indicator light two.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example one

As shown in fig. 1:

an insulation inspection module comprises a branch circuit, a positive bus and a negative bus, wherein balance resistors R + and R-and branch circuit insulation resistors RL + and RL-are arranged on the branch circuit and are connected in series, the branch circuit insulation resistors RL + and RL-are connected in parallel, numerical values between the insulation resistors RL + and RL-are not equal, a first switch K and a second switch K1 are arranged on the branch circuit, one end of the first switch K and one end of the second switch K1 are respectively connected with the ground, two 1M resistors and two 100K resistors are arranged between the positive bus and the negative bus, the two 1M resistors are arranged in series, the two 100K resistors are arranged in series, the balance resistors R + and R-are positioned between the positive bus and the negative bus, a resistor RL is arranged between the positive bus and the negative bus in series, a leakage current sensor is arranged between the positive bus and the negative bus in series, and the leakage current sensor is a direct current, the default transformation ratio is 10mA/5V, the positive bus and the negative bus simultaneously pass through the current sensor, the penetration direction of the buses is marked according to the shell of the sensor, the arrow indicates the load direction, namely, the positive leakage current enables the output of the sensor to be positive, the penetration direction is reversed, the leakage resistance cannot be detected systematically, and the voltages V + and V-of the positive bus and the negative bus to the ground are equal. When grounding resistors RL +, RL-exist, as long as the difference between V + and V-is larger than a set value, the device automatically accesses two 22K balance resistors, so that deviated balance voltage can be corrected, and V + + and V < - > at the moment are obtained through measurement; according to V +, V-, V + +, V-, the insulation resistance RL +, RL-of the positive and negative buses can be obtained. The detection method does not destroy the balance state of the bus to the ground, does not influence any running state and performance of the bus, and can realize quick measurement. When the bus insulation resistance is smaller than the set value and an alarm is given, the device automatically enters a branch inspection state after time delay. And simultaneously enters a branch display interface.

Example two

As shown in fig. 2-3:

an insulation inspection module comprises a host, a first slave machine 1, a second slave machine, a third slave machine, a first bus, a second bus, a first charging screen bus feed-out loop, a second charging screen bus feed-out loop, a main charging screen, a first feed-out cabinet, a second feed-out cabinet and a third feed-out cabinet, wherein the host is provided with a dot matrix liquid crystal display and an operation keyboard, the host is sequentially connected with the first slave machine 1, the second slave machine and the third slave machine in series through a 485 bus, leakage current sensors are arranged inside the main charging screen, the first charging screen bus feed-out loop and the second charging screen bus feed-out loop are arranged inside the main charging screen, the first charging screen bus feed-out loop is electrically connected with the first bus, the first feed-out cabinet, the second feed-out cabinet and the third feed-out cabinet are respectively provided with the first bus feed-out loop and the second bus feed-out loop, and the first bus feed-out loop and the second bus feed-out loop which are respectively electrically connected with the first bus and the second bus And the first feed-out cabinet is electrically connected with the first slave machine 1, the second feed-out cabinet is electrically connected with the second slave machine, the third feed-out cabinet is electrically connected with the third slave machine, the first indicator lamp 2 and the second indicator lamp 3 are arranged on the front surface of the first slave machine 1, the first indicator lamp 2 is an electrified indicator lamp, the number of the second indicator lamps 3 is twenty, the second indicator lamp 3 is a double-light-emitting diode indicator lamp, wherein the anode is grounded to display a red lamp, and the cathode is grounded to display a green lamp.

When the current sensor is used, the zero drift current I of the current sensor is detected, then the K1 is closed and connected into the balance resistor R + and R-with smaller resistance, as long as RL + and RL-are not equal, the leakage current changes to obtain a current value I1, and the difference between the current value I and the current value is in direct proportion to the actual leakage current. The leakage current value of each loop is detected according to the change value of the balance voltage, and the branch insulation resistance RL +, RL-can be obtained. The principle can avoid the influence of the zero drift of the leakage current sensor. The detection control strategy adopts an accumulative integral judgment method, namely, after the voltage to ground of the bus is unbalanced, the detection of the bus and the branch is only carried out once, and the second detection is called only when the grounding condition is further changed or recovered to cause the voltage to continuously change, so that the condition that the resistance is frequently accessed to influence the operation of the bus is avoided. When the bus grounding is recovered from the fault, the device can automatically operate the primary branch polling to recover the fault alarm branch.

In conclusion, the device adopts a direct current balance resistance detection method to carry out ground detection, has high accuracy and accurate measurement, adopts a CAN communication mode, CAN inform a host of a direct current screen of collected information in real time, sends the collected various information to a background through the host, uses a direct current leakage current sensor, defaults to a transformation ratio of 10mA/5V, and determines the perforation diameter according to the requirement of the line diameter of a main loop. The positive and negative buses simultaneously penetrate through the current sensor, the penetrating direction of the buses is marked according to a sensor shell, the arrow points to the load direction, namely, the positive leakage current enables the output of the sensor to be positive, the penetrating direction is reversed, so that the leakage resistance cannot be systematically detected, an indicator lamp I and an indicator lamp II are arranged, the indicator lamp I is electrified to indicate, the indicator lamp II is a double-light-emitting diode used for grounding indication, the positive electrode is grounded to display a red light, and the negative electrode is grounded to display a green light.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides an insulating module of patrolling and examining, includes branch road, positive bus and negative bus, its characterized in that: the branch circuit is provided with balance resistors R + and R-and branch circuit insulation resistors RL + and RL-, the balance resistors R + and R-are connected in series, the branch circuit insulation resistors RL + and RL-are connected in parallel, the branch circuit is provided with a first switch K and a second switch K1, one end of the first switch K and one end of the second switch K1 are respectively connected with the ground, two 1M resistors and two 100K resistors are arranged between the positive bus and the negative bus, the two 1M resistors are connected in series, the two 100K resistors are connected in series, the balance resistors R + and R-are located between the positive bus and the negative bus, a resistor RL is connected between the positive bus and the negative bus in series, and the positive bus and the negative bus are provided with a leakage sensor in series.

2. The insulation inspection module according to claim 1, wherein: the leakage current sensor is a direct current leakage current sensor, and the default transformation ratio is 10 mA/5V.

3. The insulation inspection module according to claim 1, wherein: the insulation resistances RL + and RL-are not equal in value.