CN215340072U - Built-in battery grounding resistance test module applied to distribution network equipment - Google Patents
Built-in battery grounding resistance test module applied to distribution network equipment Download PDFInfo
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- CN215340072U CN215340072U CN202121341076.2U CN202121341076U CN215340072U CN 215340072 U CN215340072 U CN 215340072U CN 202121341076 U CN202121341076 U CN 202121341076U CN 215340072 U CN215340072 U CN 215340072U
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Abstract
The application relates to a built-in battery grounding resistance test module applied to distribution network equipment, which comprises a positive electrode bias resistor, a positive electrode bias switch, a negative electrode bias resistor, a negative electrode bias switch, a relay group, a positive sampling resistor group and a negative sampling resistor group; the positive electrode bias resistor is electrically connected with two ends of the positive electrode grounding resistor after being connected with the positive electrode bias switch in series; the negative electrode bias resistor is electrically connected with two ends of the negative electrode grounding resistor after being connected with the negative electrode bias switch in series; one end of the relay group is electrically connected with the connecting end of the positive electrode bias switch and the negative electrode bias switch, and the other end of the relay group is electrically connected with the connecting end of the positive electrode grounding resistor and the negative electrode grounding resistor; the positive sampling resistor group is electrically connected with the two ends of the positive bias resistor and the positive bias switch which are connected in series; the negative sampling resistor group is electrically connected with the two ends of the negative bias resistor and the negative bias switch which are connected in series. The problem of the ground insulation and voltage resistance of equipment can be solved, and the introduced error caused by the resistance value can be reduced.
Description
Technical Field
The application relates to the field of power supplies, in particular to a built-in battery ground resistance testing module applied to distribution network equipment.
Background
In recent years, with the vigorous development of electric power system construction in China, the automation level is higher and higher, the power supply reliability is higher and higher, and more spare battery packs are added in distribution network equipment and used for enabling the equipment to work normally in a power failure state and enabling a switch to act correctly.
Insulation resistance: the direct current voltage is added to the dielectric medium, and after a certain time of polarization process, the resistance corresponding to the leakage current flowing through the dielectric medium is called the insulation resistance.
Insulation resistance is the most basic insulation index for electrical equipment and electrical lines. For the handover test of low-voltage electrical devices, the insulation resistance of motors, distribution equipment and distribution lines should not be lower than 0.5M Ω at normal temperature (for equipment and lines in operation, the insulation resistance should not be lower than 1M Ω/kV). The insulation resistance of the low-voltage electrical apparatus, the connecting cable and the secondary loop thereof is generally not lower than 1M omega; should not be less than 0.5M Ω in a relatively humid environment; the insulation resistance of the small bus of the secondary circuit should not be lower than 10M omega. The insulation resistance of the I-type hand-held electric tool should not be lower than 2M omega
The battery pack adopts a floating system, a grounding insulation resistor exists between the battery pack and the ground, and whether the insulation index of the battery pack system meets the requirement or not is judged by measuring the insulation resistance value between the anode and the cathode of the battery and the ground.
Because the battery pack is a floating system, the requirement of 2000Vac/1min voltage resistance test is also met with the ground, and contradiction exists between the requirement and insulation resistance measurement.
Disclosure of Invention
In view of this, the present application provides a built-in battery ground resistance testing module applied to distribution network equipment, which can solve the problem of insulation and voltage resistance of equipment ground and reduce introduced errors caused by resistance values.
According to one aspect of the application, a built-in battery ground resistance testing module applied to distribution network equipment is provided, and comprises a positive electrode bias resistor, a positive electrode bias switch, a negative electrode bias resistor, a negative electrode bias switch, a relay group, a positive sampling resistor group and a negative sampling resistor group;
the positive electrode bias resistor is connected with the positive electrode bias switch in series and is suitable for being electrically connected to two ends of a positive electrode grounding resistor of a built-in battery;
the negative bias resistor is connected with the negative bias switch in series and is suitable for being electrically connected to two ends of a negative grounding resistor of the built-in battery;
one end of the relay group is electrically connected with the connecting end of the positive electrode bias switch and the negative electrode bias switch, and the other end of the relay group is electrically connected with the connecting end of the positive electrode grounding resistor and the negative electrode grounding resistor, so that the connection or disconnection between the test module and the built-in battery is controlled through the connection or the switch of the relay group;
the positive sampling resistor group is electrically connected to two ends of the positive bias resistor and the positive bias switch which are connected in series, and the middle connection point of the positive sampling resistor group is used as a first signal output end;
the negative sampling resistor group is electrically connected to two ends of the negative bias resistor and the negative bias switch which are connected in series, and the middle connection point of the negative sampling resistor group is used as a second signal output end;
the positive sampling resistor group and the negative sampling resistor group are connected, and the positive bias switch and the negative bias switch are connected to the ground.
In a possible implementation manner, the relay group comprises two relay units, and the two relay units are sequentially connected in series.
In a possible implementation manner, the positive sampling resistor group includes more than two sampling resistors, and the more than two sampling resistors are sequentially connected in series.
In one possible implementation, the number of the sampling resistors is two.
In a possible implementation manner, the negative sampling resistor group includes more than two sampling resistors, and the more than two sampling resistors are sequentially connected in series.
In one possible implementation, the number of the sampling resistors is two.
In a possible implementation manner, the withstand voltage value of each relay unit is 1000Vac/1 min.
In a possible implementation manner, the system further comprises a signal conditioning module and a controller;
the signal conditioning module is electrically connected with the first signal output end and the second signal output end and is used for acquiring signals;
the controller is electrically connected with the signal conditioning module and used for calculating the resistance values of the anode grounding resistance and the cathode grounding resistance according to the signals.
In one possible implementation, the signal conditioning module is a 16-bit high-precision ADC.
In a possible implementation manner, a serial port for data transmission is provided on the controller.
The built-in battery ground resistance test module applied to the distribution network equipment uses the relay group, the test signal ground wire inside the power supply is connected to the shell through the relay group, and the relay group is closed only when the test is needed. Through the closed state and the open state of the relay group, the grounding resistance test module of the built-in battery applied to the distribution network equipment is in a test or disconnected state. And the problem of insulation and voltage resistance of equipment grounding can be solved by arranging the relay group at the grounding end. And a positive sampling resistor group and a negative sampling resistor group are introduced, wherein the positive sampling resistor group is paired with the positive bias resistor, and the negative sampling resistor group is paired with the negative bias resistor, so that introduced errors caused by resistance values are reduced. When the insulation resistance is measured, the conductance value of the sampling resistor is used as an accounting parameter by using a conductance method, the conductance values under different states are collected, algebraic operation is carried out by using the conductance values, the conductance values under various states are accurately collected, the conductance values of all parallel signals are only required to be simply added and calculated under the same voltage as the inverted value of the resistance value, the conductance value of the anode grounding resistor and the conductance value of the cathode grounding resistor can be obtained by subtracting the conductance value of the sampling resistor when the sampling resistor is finally calculated, and the conductance value of the anode grounding resistor and the conductance value of the cathode grounding resistor can be obtained by only using division calculation. To sum up, the built-in battery ground resistance test module applied to the distribution network equipment in the embodiment of the application can solve the problem of equipment ground insulation and voltage resistance and can also reduce the introduced error caused by the resistance value.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.
Fig. 1 shows a circuit diagram of a built-in battery ground resistance test module applied to a distribution network device according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
Fig. 1 shows a circuit diagram of a ground resistance test module of an internal battery 400 applied to a distribution network device according to an embodiment of the present application. As shown in fig. 1, the ground resistance test module of the internal battery 400 applied to the distribution network equipment includes: the positive bias resistor R +, the positive bias switch K3, the negative bias resistor R-, the negative bias switch K4, the relay group 100, the positive sampling resistor group 200 and the negative sampling resistor group 300. The positive bias resistor R + is connected in series with the positive bias switch K3, and is adapted to be electrically connected to both ends of the positive ground resistor Rx of the internal battery 400. The negative bias resistor R-is adapted to be electrically connected to both ends of a negative ground resistor Ry of the built-in battery 400 after being connected in series with the negative bias switch K4. One end of the relay set 100 is electrically connected to the connection end of the positive bias switch K3 and the negative bias switch K4, and the other end of the relay set 100 is electrically connected to the connection end of the positive ground resistor Rx and the negative ground resistor Ry, so that the connection or disconnection between the test module and the internal battery 400 is controlled by the connection or the disconnection of the relay set 100. The positive sampling resistor group 200 is electrically connected to two ends of the series connection of the positive bias resistor R + and the positive bias switch K3, and the middle connection point of the positive sampling resistor group 200 serves as a first signal output end. The negative sampling resistor group 300 is electrically connected to two ends of the negative bias resistor R-and negative bias switch K4 which are connected in series, and the middle connection point of the negative sampling resistor group 300 is used as a second signal output end. The connection terminals of the positive sampling resistor set 200 and the negative sampling resistor set 300, and the connection terminals of the positive bias switch K3 and the negative bias switch K4 are grounded (i.e., electrically connected to the housing).
The ground resistance test module of the built-in battery 400 applied to the distribution network equipment in the embodiment of the application uses the relay group 100, the ground wire of the test signal in the power supply is connected to the shell through the relay group 100, and the relay group 100 is closed only when the test is needed. Through the two states of closing and opening of the relay group 100, the grounding resistance test module of the built-in battery 400 applied to the distribution network equipment in the embodiment of the application is in a test or disconnection state. And the problem of insulation and voltage resistance of the equipment can be solved by arranging the relay group 100 at the grounding end. And a positive sampling resistor group 200 and a negative sampling resistor group 300 are introduced, wherein the positive sampling resistor group 200 is paired with a positive bias resistor R +, and the negative sampling resistor group 300 is paired with a negative bias resistor R-, so that introduced errors caused by resistance values are reduced. When the insulation resistance is measured, the conductance value of the sampling resistor is used as an accounting parameter by using a conductance method, the conductance values under different states are collected, algebraic operation is carried out by using the conductance values, the conductance values under various states are accurately collected, the conductance values of all parallel signals are only required to be simply added and calculated under the same voltage as the inverted value of the resistance value, the conductance value of the positive grounding resistor Rx and the conductance value of the negative grounding resistor Ry can be obtained by subtracting the conductance value of the sampling resistor when the sampling resistor is finally calculated, and the conductance value of the positive grounding resistor Rx and the conductance value of the negative grounding resistor Ry can be obtained by only using division calculation. To sum up, the grounding resistance test module of the internal battery 400 applied to the distribution network equipment in the embodiment of the application can solve the problem of insulation and voltage resistance of the equipment, and can also reduce the introduced error caused by the resistance value.
In one possible implementation, the relay group 100 includes two relay units, and the two relay units are sequentially connected in series. Here, it should be noted that the relay cell includes a first cell K1 and a second cell K2, wherein a switch of the first cell K1 and a switch of the second cell K2 are connected in series.
In one possible implementation, the positive sampling resistor set 200 includes more than two sampling resistors, and the more than two sampling resistors are sequentially connected in series.
Further, in a possible implementation, the number of the sampling resistors in the positive sampling resistor group 200 is two. The positive sampling resistor 200 comprises a first positive sampling resistor R1 and a second positive sampling resistor R2, the first positive sampling resistor R1 and the second positive sampling resistor R2 are arranged in series, one end, which is not electrically connected with the second positive sampling resistor R2, of the first positive sampling resistor R1 is electrically connected with a positive bias resistor R +, and one end, which is not electrically connected with the first positive sampling resistor R1, of the second positive sampling resistor R2 is electrically connected with the connecting end of the positive bias switch K3 and the negative bias switch K4. The middle connection point between the first anode sampling resistor R1 and the second anode sampling resistor R2 is a first signal output end.
In one possible implementation, the negative sampling resistor set 300 includes more than two sampling resistors, and the more than two sampling resistors are connected in series in sequence.
Further, in a possible implementation, the number of the sampling resistors in the negative sampling resistor group 300 is two. The negative sampling resistor group 300 comprises a first negative sampling resistor R3 and a second negative sampling resistor R4, the first negative sampling resistor R3 and the second negative sampling resistor R4 are arranged in series, one end, which is not electrically connected with the second negative sampling resistor R4, of the first negative sampling resistor R3 is electrically connected with a negative bias resistor R < - > electrically, and one end, which is not electrically connected with the first negative sampling resistor R3, of the second negative sampling resistor R4 is electrically connected with the connecting end of the positive bias switch K3 and the negative bias switch K4. And the middle connection point between the first negative sampling resistor R3 and the second negative sampling resistor R4 serves as a second signal output end.
In one possible implementation, the positive sampling resistor 200 and the negative sampling resistor are both high precision resistors. The sampling accuracy can be further improved by setting the positive sampling resistor 200 and the negative sampling resistor as high-accuracy resistors.
In one possible implementation, the withstand voltage value of each relay unit is 1000Vac/1 min. Each stage of relay node can bear the withstand voltage of 1000Vac/1min, and two stages can bear the withstand voltage of 2000Vac/1 min. Therefore, the test requirement of 2000Vac/1min of the equipment ground insulation withstand voltage is met.
In a possible implementation manner, the system further includes a signal conditioning module 500 and a controller 600, where the signal conditioning module 500 is electrically connected to both the acquisition output end of the positive sampling resistor group 200 and the acquisition output end of the negative acquisition resistor group, and is used to acquire signals of the first signal output end and the second signal output end. The controller 600 is electrically connected to the signal conditioning module 500, and is configured to calculate resistance values of the positive ground resistance Rx and the negative ground resistance Ry according to the acquired signal. The collected data of the insulation resistors (namely the positive electrode grounding resistor Rx and the negative electrode grounding resistor Ry) are transmitted to a remote host in an isolated mode through a serial port, and data remote transmission and equipment remote measurement are achieved.
Further, in one possible implementation, the signal conditioning module 500 is a high-precision 16-bit ADC module. Thereby, the sampling precision is further improved.
Further, in a possible implementation manner, the controller 600 is provided with a serial port for data transmission.
Further, in one possible implementation, the controller 600 may be a 32-bit single chip machine.
The health state of insulation is judged through the data of the insulation resistance value, when the insulation is less than 0.5M omega, the insulation is considered to be damaged, the insulation strengthening treatment is prompted, and the situation that the distribution network equipment cannot be switched on and off due to the insulation damage when the distribution network equipment needs to be switched on and off is prevented. For preventing switch failure.
In one possible implementation, the controller 600 has a real-time clock, and each set of data may be time-stamped to determine a test time point of the data. The controller 600 is internally provided with a storage space, can store the insulation resistance value every time for a long time, and can draw an insulation aging curve to perform fault analysis and subsequent optimization processing by matching with a clock signal.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A built-in battery ground resistance test module applied to distribution network equipment is characterized by comprising a positive electrode bias resistor, a positive electrode bias switch, a negative electrode bias resistor, a negative electrode bias switch, a relay group, a positive sampling resistor group and a negative sampling resistor group;
the positive electrode bias resistor is connected with the positive electrode bias switch in series and is suitable for being electrically connected to two ends of a positive electrode grounding resistor of a built-in battery;
the negative bias resistor is connected with the negative bias switch in series and is suitable for being electrically connected to two ends of a negative grounding resistor of the built-in battery;
one end of the relay group is electrically connected with the connecting end of the positive electrode bias switch and the negative electrode bias switch, and the other end of the relay group is electrically connected with the connecting end of the positive electrode grounding resistor and the negative electrode grounding resistor, so that the connection or disconnection between the test module and the built-in battery is controlled through the connection or the switch of the relay group;
the positive sampling resistor group is electrically connected to two ends of the positive bias resistor and the positive bias switch which are connected in series, and the middle connection point of the positive sampling resistor group is used as a first signal output end;
the negative sampling resistor group is electrically connected to two ends of the negative bias resistor and the negative bias switch which are connected in series, and the middle connection point of the negative sampling resistor group is used as a second signal output end;
the positive sampling resistor group and the negative sampling resistor group are connected, and the positive bias switch and the negative bias switch are connected to the ground.
2. The internal battery ground resistance test module applied to the distribution network equipment, according to claim 1, wherein the relay set comprises two relay units, and the two relay units are sequentially connected in series.
3. The module for testing the ground resistance of the internal battery applied to the distribution network equipment as claimed in claim 1, wherein the positive sampling resistor group comprises more than two sampling resistors, and the more than two sampling resistors are sequentially connected in series.
4. The module for testing the ground resistance of the internal battery applied to the distribution network equipment as claimed in claim 3, wherein the number of the sampling resistors is two.
5. The module for testing the ground resistance of the internal battery applied to the distribution network equipment as claimed in claim 1, wherein the negative sampling resistor set comprises more than two sampling resistors, and the more than two sampling resistors are sequentially connected in series.
6. The module for testing the ground resistance of the internal battery applied to the distribution network equipment as claimed in claim 5, wherein the number of the sampling resistors is two.
7. The internal battery ground resistance test module applied to distribution network equipment of claim 2, wherein the withstand voltage value of each relay unit is 1000Vac/1 min.
8. The module for testing the ground resistance of the internal battery applied to the distribution network equipment is characterized by further comprising a signal conditioning module and a controller;
the signal conditioning module is electrically connected with the first signal output end and the second signal output end and is used for acquiring signals;
the controller is electrically connected with the signal conditioning module and used for calculating the resistance values of the anode grounding resistance and the cathode grounding resistance according to the signals.
9. The internal battery ground resistance test module applied to the distribution network equipment in claim 8, wherein the signal conditioning module is a 16-bit high-precision ADC.
10. The module of claim 9, wherein the controller is provided with a serial port for data transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121341076.2U CN215340072U (en) | 2021-06-16 | 2021-06-16 | Built-in battery grounding resistance test module applied to distribution network equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121341076.2U CN215340072U (en) | 2021-06-16 | 2021-06-16 | Built-in battery grounding resistance test module applied to distribution network equipment |
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| CN215340072U true CN215340072U (en) | 2021-12-28 |
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| CN202121341076.2U Active CN215340072U (en) | 2021-06-16 | 2021-06-16 | Built-in battery grounding resistance test module applied to distribution network equipment |
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