CN212675078U - Insulation monitoring device based on direct current system - Google Patents
Insulation monitoring device based on direct current system Download PDFInfo
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- CN212675078U CN212675078U CN202020991975.6U CN202020991975U CN212675078U CN 212675078 U CN212675078 U CN 212675078U CN 202020991975 U CN202020991975 U CN 202020991975U CN 212675078 U CN212675078 U CN 212675078U
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Abstract
The utility model discloses an insulation monitoring device based on a direct current system, which comprises a monitoring host and a fault finder; the monitoring host is electrically connected with the fault finding instrument; the number of the balance bridges arranged in the monitoring host is 1, the monitoring host is respectively connected with a positive bus, a negative bus and a ground wire of the direct current system to be monitored, and the monitoring host is used for monitoring whether each branch in the direct current system to be monitored has a ground fault in real time and sending a fault signal to a fault finder when the ground fault occurs; the fault finding instrument is connected between a positive bus and a negative bus of the direct current system to be monitored, is connected with a load connected between the positive bus and the negative bus in parallel, and is used for determining a ground fault point after receiving a fault signal. The technical effect that the grounding fault point can be accurately positioned through the fault finding instrument without withdrawing the monitoring host from the direct current system is achieved.
Description
Technical Field
The embodiment of the utility model provides an embodiment relates to direct current system technical field, especially relates to an insulation monitoring device based on direct current system.
Background
With the development of science and technology, electric energy is increasingly used in life, wherein the development of a direct current system is particularly rapid, and the direct current system is a system which is not necessarily lacked by a power plant and a power supply station. However, during long-term operation, due to environmental changes, climate changes, aging of cables and joints, problems of equipment, and the like, grounding of the dc system inevitably occurs, and each grounding of the dc system may cause protection misoperation or protection failure, which jeopardizes normal operation of the system.
The existing insulation monitoring device can only monitor whether grounding exists in a direct current system and judge a grounding branch. If the ground fault point is to be further determined, a portable direct current ground fault finder needs to be used to find the ground fault point. However, when the portable dc ground fault finder is used to find a ground fault point, the insulation monitoring device needs to be withdrawn from the dc system, because two balance bridges are built in the insulation monitoring device, the resistance of the balance bridges affects the calculation of the portable dc ground fault finder, and the position of the ground fault point cannot be accurately determined, thereby affecting the stability of the dc system.
SUMMERY OF THE UTILITY MODEL
The utility model provides an insulation monitoring device based on direct current system has realized not needing to withdraw from direct current system with the monitoring host computer and can be through the technological effect of fault finding appearance accurate positioning earth fault point.
The embodiment of the utility model provides an insulation monitoring device based on a direct current system, which comprises a monitoring host and a fault finder; the monitoring host is electrically connected with the fault finding instrument;
the number of the balance bridges arranged in the monitoring host is 1, and the monitoring host is respectively connected with a positive bus, a negative bus and a ground wire of the direct current system to be monitored, is used for monitoring whether each branch in the direct current system to be monitored has a ground fault in real time and sending a fault signal to the fault finder when the ground fault occurs;
the fault finding instrument is connected between a positive bus and a negative bus of the direct current system to be monitored, is connected with a load connected between the positive bus and the negative bus in parallel, and is used for determining a ground fault point after receiving the fault signal.
Furthermore, the monitoring host comprises a data acquisition unit, a data processing unit and a signal generation unit;
the data acquisition unit and the signal generation unit are electrically connected with the data processing unit;
the data acquisition unit acquires a voltage value and a leakage current value of the direct current system to be monitored and transmits the voltage value and the leakage current value to the data processing unit;
and the data processing unit determines whether each branch in the direct current system to be monitored has a ground fault or not based on the voltage value and the leakage current value, and controls the signal generating unit to send the fault signal to the fault searching instrument when the ground fault occurs.
Further, the data acquisition unit comprises a leakage current sensor and a voltage sensor;
the leakage current sensor is used for acquiring the leakage current value of the direct current system to be monitored;
the voltage sensor is used for collecting the voltage values to earth of the positive bus and the negative bus in the direct current system to be monitored, and the voltage values are obtained.
Furthermore, the monitoring host further comprises a signal processor, and the signal processor is connected between the leakage current sensor and the data processing unit and is used for filtering and amplifying the leakage current value acquired by the leakage current sensor.
Furthermore, the monitoring host also comprises a first display unit which is electrically connected with the data processing unit;
the first display unit is used for displaying each monitoring data of the direct current system to be monitored, which is monitored by the monitoring host in real time.
Furthermore, the monitoring host also comprises a human-computer interaction unit which is electrically connected with the data processing unit;
and setting or changing various parameters of the monitoring host through the man-machine interaction unit.
Further, the man-machine interaction unit comprises at least one key and/or a touch display screen.
Furthermore, the fault finding instrument comprises a second display unit, and the second display unit is used for displaying the measurement data of the measured branch in the direct current system to be monitored and the position information of the ground fault point.
Furthermore, the fault finding instrument further comprises an alarm unit, wherein the alarm unit is used for giving an alarm to a worker after receiving the fault signal so as to prompt that the direct current system to be monitored has a ground fault.
Furthermore, the monitoring host and the fault finding instrument are in communication connection in a wireless communication mode.
The utility model discloses an insulation monitoring device based on a direct current system, which comprises a monitoring host and a fault finder; the monitoring host is electrically connected with the fault finding instrument; the number of the balance bridges arranged in the monitoring host is 1, the monitoring host is respectively connected with a positive bus, a negative bus and a ground wire of the direct current system to be monitored, and the monitoring host is used for monitoring whether each branch in the direct current system to be monitored has a ground fault in real time and sending a fault signal to a fault finder when the ground fault occurs; the fault finding instrument is connected between a positive bus and a negative bus of the direct current system to be monitored, is connected with a load connected between the positive bus and the negative bus in parallel, and is used for determining a ground fault point after receiving a fault signal. The technical effect that the grounding fault point can be accurately positioned through the fault finding instrument without withdrawing the monitoring host from the direct current system is achieved.
Drawings
Fig. 1 is a structural diagram of an insulation monitoring device based on a dc system according to an embodiment of the present invention;
fig. 2 is a structural diagram of a monitoring host provided in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not intended to limit a specific order. The embodiments of the present invention can be implemented individually, and can be implemented by combining each other between the embodiments, and the embodiments of the present invention are not limited to this.
Fig. 1 is a structural diagram of an insulation monitoring device based on a dc system according to an embodiment of the present invention. As shown in fig. 1, the insulation monitoring device based on the dc system includes a monitoring host 10 and a fault finder 20; monitoring host 10 is electrically connected to a trouble shooting device 20.
The number of the balance bridges arranged in the monitoring host 10 is 1, and the monitoring host 10 is respectively connected with a positive bus VCC, a negative bus VSS and a ground wire GND of the dc system 30 to be monitored, and is configured to monitor whether a ground fault occurs in each branch in the dc system 30 to be monitored in real time, and send a fault signal to the fault finder 20 when the ground fault occurs.
The fault finder 20 is connected between the positive bus VCC and the negative bus VSS of the dc system 30 to be monitored, and is connected in parallel to the load 40 connected between the positive and negative buses, and configured to determine a ground fault point after receiving a fault signal.
Optionally, the monitoring host 10 and the fault finding device 20 are in communication connection through a wireless communication mode.
Specifically, a balance bridge is arranged in the monitoring host 10, the voltages to ground of the positive bus and the negative bus in the monitoring direct current system 30 are in a balanced state under normal conditions, when a ground fault occurs, the voltages to ground of one side of the positive bus and the negative bus can change, and the monitoring host 10 can monitor the changes to the voltages to ground of the positive bus and the negative bus in the direct current system 30 to be monitored in real time; when the change is monitored, it is determined that the direct current system 30 to be monitored has a ground fault, and a fault signal is sent to the fault finding instrument 20 in a wireless communication manner, the fault finding instrument 20 sends an alarm prompt based on the received fault signal to prompt a worker that the direct current system 30 to be monitored has a ground fault, and the worker accesses the fault finding instrument 20 into the direct current system 30 to be monitored after receiving the alarm prompt, so as to determine the accurate position of a ground fault point.
It should be noted that, while monitoring the dc system 30 to be monitored, the monitoring host 10 collects a voltage value and a leakage current value of each branch in the dc system 30 to be monitored, where the leakage current value is a leakage current value of each branch in the dc system 30 to be monitored, and the monitoring host 10 calculates an insulation resistance of each branch with respect to the ground of a positive electrode and a negative electrode based on a change of a leakage current of each branch, and assists in determining which branch has a ground fault by using the calculated insulation resistance value.
The embodiment of the utility model provides an in, through set up a balance bridge in monitoring host computer 10, when having solved containing two balance bridges among the insulation monitoring device among the prior art, balance bridge resistance can produce the influence to portable direct current ground fault finding appearance and have to release direct current system's technical problem with insulation monitoring device in advance, has realized not needing to withdraw from direct current system with monitoring host computer 10 and can be through the technological effect of fault finding appearance accurate positioning ground fault point.
Fig. 2 is a structural diagram of a monitoring host provided in the embodiment of the present invention.
Optionally, as shown in fig. 2, the monitoring host 10 includes a data acquisition unit 11, a data processing unit 12, and a signal generation unit 13; the data acquisition unit 11 and the signal generation unit 13 are both electrically connected with the data processing unit 12.
The data acquisition unit 11 acquires a voltage value and a leakage current value of the direct current system 30 to be monitored, and transmits the voltage value and the leakage current value to the data processing unit 12; the data processing unit 12 determines whether each branch in the dc system 30 to be monitored has a ground fault based on the voltage value and the leakage current value, and controls the signal generating unit 13 to send a fault signal to the fault finder 20 when the ground fault occurs.
Specifically, the data acquisition unit 11 is configured to acquire a voltage value and a leakage current value in the dc system 30 to be monitored, where the voltage value is a voltage-to-ground voltage value of a positive bus and a negative bus in the dc system 30 to be monitored, and the leakage current value is a leakage current value of each branch in the dc system 30 to be monitored; the data processing unit 12 determines whether each branch in the dc system 30 to be monitored has a ground fault based on the received voltage value and the leakage current value, and specifically determines which branch has a ground fault, and then controls the signal generating unit 13 to send a fault signal to the fault finder 20 when it is determined that a branch has a ground fault.
After receiving the fault signal, the fault finding instrument 20 can select an address number matched with fault branch information carried in the fault signal sent by the monitoring host 10, and perform fault point finding on the fault branch based on the address number, thereby finally determining an accurate ground fault point.
Optionally, as shown in fig. 2, the data acquisition unit 11 includes a leakage current sensor 111 and a voltage sensor 112; the leakage current sensor 111 is used for collecting the leakage current value of the direct current system to be monitored; the voltage sensor 112 is used to collect the voltages to ground of the positive and negative buses in the dc system 30 to be monitored, so as to obtain voltage values.
Optionally, as shown in fig. 2, the monitoring host 10 further includes a signal processor 14, and the signal processor 14 is connected between the leakage current sensor 111 and the data processing unit 12, and is configured to filter and amplify the leakage current value collected by the leakage current sensor 111.
Specifically, the leakage current value is an electric signal, is acquired by the leakage current sensor 111 in the data acquisition unit 11, is filtered and amplified by the signal processor 14, and is finally transmitted to the data processing unit 12; the voltage values are the voltages to ground of the positive and negative buses in the dc system 30 to be monitored, and are sampled by the voltage sensor 112 in the data acquisition unit 11 and transmitted to the data processing unit 12.
Optionally, as shown in fig. 2, the monitoring host 10 further includes a first display unit 15, and the first display unit 15 is electrically connected to the data processing unit 12; the first display unit 15 is configured to display each monitoring data of the dc system 30 to be monitored in real time by the monitoring host 10.
Specifically, the monitoring host 10 is further provided with a first display unit 15, and the first display unit 15 may be a display screen with a touch function or a liquid crystal display screen without a touch function; the first display unit 15 is configured to display each monitoring data of the monitoring host 10 monitoring the dc system 30 to be monitored in real time, for example, a voltage value, a leakage current value, and the like acquired by the monitoring host 10 in real time, and each monitoring data may be displayed in a waveform form or a numerical value form, which is not described herein again.
Optionally, as shown in fig. 2, the monitoring host 10 further includes a human-computer interaction unit 16, and the human-computer interaction unit 16 is electrically connected to the data processing unit 12; the setting or changing of various parameters of the monitoring host 10 is realized through the man-machine interaction unit 16.
Optionally, the human-computer interaction unit 16 comprises at least one key and/or a touch screen display.
Specifically, the staff can set or change various parameter values of the monitoring host 10 through the human-computer interaction unit 16 on the monitoring host 10, and the human-computer interaction unit 16 may be composed of keys, a touch display screen, or both; it should be noted that, when the human-computer interaction unit 16 has a touch display screen, the first display unit 15 and the human-computer interaction unit 16 in the embodiment of the present invention may be the same display screen.
Optionally, the fault finder 20 includes a second display unit, and the second display unit is configured to display the measurement data of the measured branch in the dc system 30 to be monitored and the location information of the ground fault point.
Specifically, the trouble shooting device 20 further has a second display unit, which may be a display screen with a touch function or a liquid crystal display screen without a touch function; the fault finder 20 can display the insulation impedance and the waveform of the measured branch in the dc system 30 to be monitored through the second display unit and visually indicate the direction of the fault grounding point; meanwhile, the fault finding instrument 20 can also visually display the magnitude of the leakage current of the tested branch in the form of the magnitude of the current through the second display unit.
Optionally, the fault finder 20 further includes an alarm unit, and the alarm unit is configured to send an alarm to a worker after receiving the fault signal to prompt that a ground fault occurs in the dc system 30 to be monitored.
Specifically, when the monitoring host 10 determines that the dc system 30 to be monitored has a ground fault and sends a fault signal to the fault finder 20 in a wireless communication manner, the fault finder 20 sends an alarm prompt to a worker through an alarm unit to prompt the worker that the dc system 30 to be monitored has a ground fault, and the worker accesses the fault finder 20 to the dc system 30 to be monitored after receiving the alarm prompt, so as to determine an accurate position of a ground fault point. The warning method may be to display the fault prompt information on the second display unit of the fault finding device 20.
In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An insulation monitoring device based on a direct current system is characterized by comprising a monitoring host and a fault finder; the monitoring host is electrically connected with the fault finding instrument;
the number of the balance bridges arranged in the monitoring host is 1, and the monitoring host is respectively connected with a positive bus, a negative bus and a ground wire of the direct current system to be monitored, is used for monitoring whether each branch in the direct current system to be monitored has a ground fault in real time and sending a fault signal to the fault finder when the ground fault occurs;
the fault finding instrument is connected between a positive bus and a negative bus of the direct current system to be monitored, is connected with a load connected between the positive bus and the negative bus in parallel, and is used for determining a ground fault point after receiving the fault signal.
2. The insulation monitoring device based on the direct current system according to claim 1, wherein the monitoring host comprises a data acquisition unit, a data processing unit and a signal generation unit;
the data acquisition unit and the signal generation unit are electrically connected with the data processing unit;
the data acquisition unit acquires a voltage value and a leakage current value of the direct current system to be monitored and transmits the voltage value and the leakage current value to the data processing unit;
and the data processing unit determines whether each branch in the direct current system to be monitored has a ground fault or not based on the voltage value and the leakage current value, and controls the signal generating unit to send the fault signal to the fault searching instrument when the ground fault occurs.
3. The insulation monitoring device based on the direct current system according to claim 2, wherein the data acquisition unit comprises a leakage current sensor and a voltage sensor;
the leakage current sensor is used for acquiring the leakage current value of the direct current system to be monitored;
the voltage sensor is used for collecting the voltage values to earth of the positive bus and the negative bus in the direct current system to be monitored, and the voltage values are obtained.
4. The insulation monitoring device based on the direct current system according to claim 3, wherein the monitoring host further comprises a signal processor, and the signal processor is connected between the leakage current sensor and the data processing unit and is configured to filter and amplify the leakage current value collected by the leakage current sensor.
5. The insulation monitoring device based on the direct current system according to claim 2, wherein the monitoring host further comprises a first display unit, and the first display unit is electrically connected with the data processing unit;
the first display unit is used for displaying each monitoring data of the direct current system to be monitored, which is monitored by the monitoring host in real time.
6. The insulation monitoring device based on the direct current system according to claim 2, wherein the monitoring host further comprises a human-computer interaction unit, and the human-computer interaction unit is electrically connected with the data processing unit;
and setting or changing various parameters of the monitoring host through the man-machine interaction unit.
7. The insulation monitoring device based on the direct current system according to claim 6, wherein the human-computer interaction unit comprises at least one key and/or a touch display screen.
8. The insulation monitoring device based on the direct current system according to claim 1, wherein the fault finder comprises a second display unit, and the second display unit is used for displaying the measurement data of the branch to be tested in the direct current system to be monitored and the position information of the ground fault point.
9. The insulation monitoring device based on the direct current system according to claim 8, wherein the fault finder further comprises an alarm unit, and the alarm unit is used for giving an alarm to a worker after receiving the fault signal to prompt that a ground fault occurs in the direct current system to be monitored.
10. The insulation monitoring device based on the direct current system according to claim 1, wherein the monitoring host and the fault finder are in communication connection through wireless communication.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020991975.6U CN212675078U (en) | 2020-06-03 | 2020-06-03 | Insulation monitoring device based on direct current system |
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| CN202020991975.6U CN212675078U (en) | 2020-06-03 | 2020-06-03 | Insulation monitoring device based on direct current system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777525A (en) * | 2021-08-27 | 2021-12-10 | 广西电网有限责任公司北海供电局 | Short-time-break direct-current ground fault searching method and system |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777525A (en) * | 2021-08-27 | 2021-12-10 | 广西电网有限责任公司北海供电局 | Short-time-break direct-current ground fault searching method and system |
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