CN215067203U - Non-reliable grounding fault monitoring system of direct-current power supply system - Google Patents
Non-reliable grounding fault monitoring system of direct-current power supply system Download PDFInfo
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Abstract
The utility model relates to a DC power supply system monitors technical field, is a DC power supply system can not lean on ground fault monitoring system, and it includes a plurality of insulation monitoring host computers, a plurality of monitoring auxiliary engine, a plurality of route selection module and a plurality of current induction module, insulation monitoring host computer and monitoring auxiliary engine one-to-one are connected, and every monitoring auxiliary engine is connected with a plurality of route selection modules, and every route selection module is connected with a plurality of current induction module. The utility model discloses simple structure, convenient to use through insulation monitoring host computer, monitoring auxiliary engine, route selection module and cooperate, have realized carrying out real time monitoring, judgement and location to DC power supply system insulation fault to can effectively judge the location to instantaneous earth fault, provide the foundation for all insulation fault point investigation of DC system, shorten the fault existence time, promote DC power supply system security, guarantee electric power system safe and reliable moves.
Description
Technical Field
The utility model relates to a direct current power supply system monitors technical field, is a direct current power supply system can not lean on ground fault monitoring system.
Background
The direct current system is a power supply system of secondary equipment of the transformer substation, the direct current system network of the transformer substation is huge, and the direct current power supply system is designed into an ungrounded system, so that the occurrence of protection misoperation or operation failure accidents caused by the fact that a ground fault forms a wrong loop is avoided. The existing insulation monitoring device and the grounding finder of the running direct-current power supply system aim at permanent grounding faults, and the existing equipment cannot effectively monitor and find the existing equipment due to the short existence time of the grounding faults, thereby bringing great trouble to power production maintenance personnel.
Disclosure of Invention
The utility model provides a direct current power supply system can not lean on ground fault monitoring system has overcome above-mentioned prior art not enough, and it can effectively solve the problem that can not carry out the monitoring to can not lean on ground fault because of ground fault to the ground fault that can not lean on ground fault that current direct current power supply system fault monitoring exists, instantaneous trouble promptly.
The technical scheme of the utility model is realized through following measure: the utility model provides a DC power supply system fault monitoring system that can't lean on ground, includes a plurality of insulation monitoring host computers, a plurality of monitoring auxiliary engine, a plurality of route selection module and a plurality of current induction module, insulation monitoring host computers and monitoring auxiliary engine one-to-one are connected, and every monitoring auxiliary engine is connected with a plurality of route selection modules, and every route selection module is connected with a plurality of current induction module.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the insulation monitoring host comprises a host general control unit, a voltage acquisition unit, a bus resistance adjusting unit, a host communication display unit, an alarm unit and a host power supply unit, wherein the host general control unit is respectively connected with the voltage acquisition unit, the bus resistance adjusting unit, the alarm unit and the host communication display unit, and the host power supply unit supplies power for the insulation monitoring host.
The host master control unit comprises a host master control module and a host storage module, and the host master control module is respectively connected with the voltage acquisition unit, the bus resistance regulation unit, the communication display unit, the power supply unit and the host storage module; the voltage acquisition unit comprises a voltage division circuit, a linear optocoupler and an amplification filter circuit, wherein the voltage division circuit, the linear optocoupler and the amplification filter circuit are sequentially connected; and the host communication display unit comprises a host communication module and a host display module, and the host communication module and the host display module are both connected with the host master control unit.
The monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit, an auxiliary machine storage unit and an auxiliary machine power supply unit, wherein the auxiliary machine main control unit is respectively connected with the auxiliary machine storage unit and the auxiliary machine communication display unit, and the auxiliary machine power supply unit supplies power for the monitoring auxiliary machine.
The auxiliary machine communication display unit comprises an auxiliary machine communication module and an auxiliary machine display unit, and the auxiliary machine communication module and the auxiliary machine display unit are both connected with the auxiliary machine main control unit.
The line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, wherein the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, and the line selection power supply unit supplies power to the line selection module.
The current acquisition unit comprises a first amplifying circuit and a second amplifying circuit, and the first amplifying circuit is connected with the second amplifying circuit; and the line selection master control unit comprises a line selection master control module, a line selection storage module and a fault indication module, and the line selection storage module and the fault indication module are connected with the line selection master control unit.
The utility model discloses simple structure, convenient to use through insulation monitoring host computer, monitoring auxiliary engine, route selection module and cooperate, have realized carrying out real time monitoring, judgement and location to DC power supply system insulation fault to can effectively judge the location to instantaneous earth fault, provide the foundation for all insulation fault point investigation of DC system, shorten the fault existence time, promote DC power supply system security, guarantee electric power system safe and reliable moves.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 2 is the circuit structure diagram of the insulation monitoring host in the embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of an isolated power module according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a second power conversion output module according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of the voltage acquisition unit in the embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of the host storage module according to an embodiment of the present invention.
Fig. 7 is a circuit structure diagram of 485 communication circuit in the embodiment of the present invention.
Fig. 8 is a schematic circuit diagram of a network communication interface circuit according to an embodiment of the present invention.
Fig. 9 is a schematic circuit diagram of the host display module according to the embodiment of the present invention.
Fig. 10 is a schematic circuit diagram of a monitoring auxiliary unit in an embodiment of the present invention.
Fig. 11 is a schematic circuit diagram of a line selection module according to an embodiment of the present invention.
Fig. 12 is a schematic circuit diagram of the current collecting unit according to the embodiment of the present invention.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1, the system for monitoring the fault of the dc power supply system without being grounded comprises a plurality of insulation monitoring hosts, a plurality of monitoring auxiliary machines, a plurality of line selection modules and a plurality of current induction modules, wherein the insulation monitoring hosts and the monitoring auxiliary machines are connected in a one-to-one correspondence manner, each monitoring auxiliary machine is connected with the plurality of line selection modules, and each line selection module is connected with the plurality of current induction modules.
In the technical scheme, a plurality of insulation monitoring hosts, a plurality of monitoring auxiliary machines, a plurality of line selection modules and a plurality of current induction modules form a fault monitoring system for the direct-current power supply system, wherein the insulation monitoring hosts are connected with the monitoring auxiliary machines in a one-to-one manner, the monitoring auxiliary machines are connected with the line selection modules in a one-to-many manner, the line selection modules are connected with the current induction modules in a one-to-many manner, and the current induction modules can be current transformers CT and are used for inducing current signals of direct-current buses; the insulation monitoring host measures the high-speed operation state of the direct current bus to the ground voltage in real time, the line selection module is connected with the plurality of current induction modules when in use, collects current signals of the direct current bus induced by the current induction modules, and judges whether the current signals are abnormal or not; when the insulation monitoring host determines that the voltage to ground of the direct-current bus is abnormal, the current judgment condition of the line selection module is inquired through the monitoring auxiliary machine, meanwhile, the voltage to ground of the direct-current bus is continuously judged, if the voltage to ground of the direct-current bus is still abnormal, a ground fault (namely a branch circuit where a current induction module corresponding to abnormal current is located) is determined, and if the voltage to ground of the direct-current bus is recovered to be normal, the instantaneous ground fault is determined.
To sum up, the utility model discloses simple structure, convenient to use through insulation monitoring host computer, monitoring auxiliary engine, route selection module and cooperate, have realized carrying out real time monitoring, judgement and location to DC power supply system insulation fault to can effectively judge the location to instantaneous earth fault, provide the foundation for all insulation fault point investigation of DC system, shorten trouble existence time, promote DC power supply system security, guarantee electric power system safe and reliable moves.
According to actual needs, the system for monitoring the fault of the direct current power supply system which cannot be connected with the ground can be further optimized or/and improved:
as shown in the attached figure 2, the insulation monitoring host comprises a host general control unit, a voltage acquisition unit, a bus resistance adjustment unit, a host communication display unit, an alarm unit and a host power supply unit, wherein the host general control unit is respectively connected with the voltage acquisition unit, the bus resistance adjustment unit, the alarm unit and the host communication display unit, and the host power supply unit supplies power to the insulation monitoring host.
In the technical scheme, the main machine power supply unit supplies power to the insulation monitoring main machine; the utility model discloses well host computer power supply unit can include first power conversion output module, keeps apart power module and second power conversion output module, and wherein first power conversion output module is used for changing 110V 220VAC into required voltage, for example changes 110V 220VAC into 5V (supply digital circuit and analog circuit work) and 24VDC (for showing and measuring the partial power supply), can select here for use bright and wonder power module; because the voltage acquisition unit of the utility model needs to be isolated from the power supply for high voltage acquisition, an isolation power supply module is arranged, and the isolation power supply module can be realized by adopting a 0505 isolation power supply module of Jinshengyang power supply company, as shown in figure 3; because the utility model discloses a digital circuit part's such as the unit is always controlled to the host computer power supply demand, so set up second power conversion output module for convert 5VDC into 3.3VDC, the utility model discloses in can adopt power chip ASM1117 to realize, specifically as shown in figure 4.
In the technical scheme, the bus resistance adjusting unit comprises a plurality of balance bridges, and each balance bridge is connected with the master control unit. The bus resistance adjusting unit comprises a plurality of balance bridges, and the master control unit controls the resistance of the direct current bus by controlling the resistance input of each balance bridge, so that the voltage adjustment of the direct current bus is realized.
In the above technical scheme, the alarm unit is the prior known technology, and can be the prior audible and visual alarm.
Based on the circuit structure of the insulation monitoring host, the corresponding working process is as follows:
firstly, the voltage acquisition unit is used for acquiring the voltage to ground of the direct-current bus in real time and sending the voltage to the master control unit for storage and analysis; then, the master control unit compares the voltage of the direct current bus to ground at a certain moment with a preset voltage value, judges whether the voltage is abnormal or not, responds to the abnormality, determines the insulation resistance according to the stored wave recording information (wave recording can be used for storing 1s data cached before the abnormality and 40s data after the abnormality to form a 41s data change trend), and continuously judges whether the voltage of the direct current bus to ground is abnormal or not, responds to the result, acquires a current signal abnormal result determined by the line selection module, simultaneously continuously judges whether the voltage is abnormal or not, responds to the result, determines a ground fault branch according to the current signal abnormal result, responds to the result, determines the branch corresponding to the current signal abnormal result to be an instantaneous ground fault, and completes monitoring of the non-ground fault of the direct current power supply system.
As shown in fig. 5, the voltage acquisition unit includes a voltage division circuit, a linear optocoupler and an amplification filter circuit, and the voltage division circuit, the linear optocoupler and the amplification filter circuit are connected in sequence.
Among the above-mentioned technical scheme, voltage acquisition unit includes bleeder circuit, linear opto-coupler device and amplification filter circuit, and voltage at first carries out the partial pressure through bleeder circuit, and input voltage control needs in the linear opto-coupler device between 0V to 200mV after the partial pressure, and the voltage is through amplifying filter circuit amplification filtering again after the amplification of linear opto-coupler device, and the output maximum voltage is close AD's reference voltage, and voltage processing enters the main control unit of host computer and carries out AD sampling after accomplishing. Wherein, the linear optical coupler can adopt HCPL-7840 linear optical coupler, and the amplifying and filtering circuit can be realized by LM358 amplifier.
As shown in fig. 2, the host master control unit includes a host master control module and a host storage module, and the host master control module is connected to the voltage acquisition unit, the bus resistance adjustment unit, the communication display unit, the power supply unit and the host storage module respectively.
In the technical scheme, the host master control unit comprises a host master control module and a host storage module, wherein the host master control module can be an STM32F103ZET6 chip, and an STM32F103ZET6 chip is an ARM 32-bit Cortex-M3 CPU, and has the characteristics of high running speed, large storage capacity, low power consumption and a large number of various functional interfaces, and the fastest 72MHz working frequency is realized; 12 AD channels, 112 fast bidirectional I/O ports and 13 communication interfaces, including a USB2.0 full-speed interface and an SDIO interface. The host storage module can be an 8G memory core circuit, and stores information data obtained by the host main control module, and the specific circuit is shown in fig. 6.
As shown in fig. 2, the host communication display unit includes a host communication module and a host display module, both of which are connected to the host general control unit.
In the above technical solution, the host communication module may include a 485 communication circuit and a network communication interface circuit; the 485 communication circuit can be as shown in fig. 7, and includes a level conversion chip SN75LBC184, which converts the signal output by the master control unit into a 485 level signal, and a 4-bit connection terminal CON2 is also placed on the PCB board, which facilitates the connection of the connection terminal provided in the present invention; the network communication interface circuit may be as shown in fig. 8.
In the above technical solution, the host display module is a prior art, and specifically, as shown in fig. 9, a circuit U6 driven by an LCD is a TTL to 232 level chip, and an L1-bit 120R magnetic bead can effectively suppress high frequency interference, and meanwhile, the display module can adopt a 7-inch serial industrial touch screen for inputting and connecting to a circuit 232 for outputting.
As shown in fig. 10, the monitoring auxiliary device includes an auxiliary device main control unit, an auxiliary device communication display unit, an auxiliary device storage unit, and an auxiliary device power supply unit, the auxiliary device main control unit is connected to the auxiliary device storage unit and the auxiliary device communication display unit, respectively, and the auxiliary device power supply unit supplies power to the monitoring auxiliary device.
In the technical scheme, the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit, an auxiliary machine storage unit and an auxiliary machine power supply unit, wherein the auxiliary machine power supply unit can convert 110V/220VAC into required voltage, for example, 110V/220VAC into 5V (for supplying power to a digital circuit and an analog circuit) and 24VDC (for supplying power to a display and measurement part), and a Mingwi power supply module can be selected; the auxiliary machine main control unit can be an STM32F103ZET6 chip, the STM32F103ZET6 chip is an ARM 32-bit Cortex-M3 CPU, and the auxiliary machine main control unit has the characteristics of high running speed, large storage capacity, low power consumption and a large number of various functional interfaces; the auxiliary machine communication display unit is used for transmitting current signals, judgment signals and the like acquired by the far-end line selection module to the insulation monitoring host, and transmitting control commands and the like of the insulation monitoring host to the corresponding line selection module; the auxiliary machine storage unit can be the same as the main machine storage module in structure, namely can be an 8G memory core circuit and stores information data obtained by the auxiliary machine main control unit.
As shown in fig. 10, the auxiliary communication display unit includes an auxiliary communication module and an auxiliary display unit, and both the auxiliary communication module and the auxiliary display unit are connected to the auxiliary general control unit.
In the above technical solution, the auxiliary communication module may include a 485 communication circuit and a network communication interface circuit; the 485 communication circuit can be as shown in fig. 7, and includes a level conversion chip SN75LBC184, which converts the signal output by the master control unit into a 485 level signal, and a 4-bit connection terminal CON2 is also placed on the PCB board, which facilitates the connection of the connection terminal provided in the present invention; the network communication interface circuit may be as shown in fig. 8.
In the above technical solution, the auxiliary display module is a prior known technology, and may have the same structure as the main display module, and specifically, as shown in fig. 9, the circuit U6 driven by the LCD is a TTL to 232 level chip, and the L1-bit 120R magnetic bead can effectively suppress high frequency interference, and meanwhile, the display module may adopt a 7-inch serial industrial touch screen, and the touch screen input circuit 232 outputs the signal.
As shown in fig. 11, the line selection module includes a line selection master control unit, a current collection unit, a line selection communication unit, and a line selection power supply unit, the line selection master control unit is connected to the current collection unit and the line selection communication unit, and the line selection power supply unit supplies power to the line selection module.
In the above technical solution, the line selection module includes a line selection master control unit, a current collection unit, a line selection communication unit and a line selection power supply unit, where the line selection power supply unit may include a first power conversion output module, an isolation power supply module and a second power conversion output module, where the first power conversion output module is configured to convert 110V/220VAC into a required voltage, for example, convert 110V/220VAC into 5V (for supplying power to a digital circuit and an analog circuit) and 24VDC (for supplying power to a display and measurement portion), where a bright power supply module may be selected; because the voltage acquisition unit of the utility model needs to be isolated from the power supply for high voltage acquisition, an isolation power supply module is arranged, and the isolation power supply module can be realized by adopting a 0505 isolation power supply module of Jinshengyang power supply company, as shown in figure 3; because the utility model discloses a power supply demand of digital circuit parts such as total accuse unit, so set up the second power conversion output module, be used for converting 5VDC into 3.3VDC, the utility model discloses in can adopt power chip ASM1117 to realize, specifically as shown in figure 4; the current acquisition unit is used for connecting the current induction module and acquiring a corresponding real-time current signal; the line selection master control unit is used for judging whether the received current is abnormal or not, judging that a ground fault occurs if the received current is abnormal, and recording waves, so that line selection positioning of the ground fault is realized; the line selection communication unit can comprise a 485 communication circuit and a network communication interface circuit; the 485 communication circuit can be as shown in fig. 7, and includes a level conversion chip SN75LBC184, which converts the signal output by the master control unit into a 485 level signal, and a 4-bit connection terminal CON2 is also placed on the PCB board, which facilitates the connection of the connection terminal provided in the present invention; the network communication interface circuit may be as shown in fig. 8.
As shown in fig. 12, the current collecting unit includes a first amplifying circuit and a second amplifying circuit, and the first amplifying circuit is connected to the second amplifying circuit.
In the technical scheme, after current is induced by CT and amplified by the first amplifying circuit and the second amplifying circuit in sequence, the AD conversion is carried out by the line selection master control unit.
As shown in fig. 11, the line selection master control unit includes a line selection master control module, a line selection storage module, and a fault indication module, and both the line selection storage module and the fault indication module are connected to the line selection master control unit.
In the technical scheme, the line selection main control module is the prior known technology and can be an STM32F103ZET6 chip, and the STM32F103ZET6 chip is an ARM 32-bit Cortex-M3 CPU, and has the characteristics of high running speed, large storage capacity, low power consumption and numerous functional interfaces; the line selection storage module can have the same result as the host storage module and can be an 8G storage core circuit for storing information data obtained by the line selection main control module, and the specific circuit is shown in figure 6; the fault indication module may be a fault indicator light.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (9)
1. The utility model provides a DC power supply system fault monitoring system that can't lean on ground which characterized in that, includes a plurality of insulation monitoring host computers, a plurality of monitoring auxiliary engine, a plurality of line selection module and a plurality of current induction module, insulation monitoring host computers and monitoring auxiliary engine one-to-one are connected, and every monitoring auxiliary engine is connected with a plurality of line selection modules, and every line selection module is connected with a plurality of current induction modules.
2. The system for monitoring the fault that the direct current power supply system cannot be grounded according to claim 1, wherein the insulation monitoring host comprises a host general control unit, a voltage acquisition unit, a bus resistance adjustment unit, a host communication display unit, an alarm unit and a host power supply unit, the host general control unit is respectively connected with the voltage acquisition unit, the bus resistance adjustment unit, the alarm unit and the host communication display unit, and the host power supply unit supplies power to the insulation monitoring host.
3. The system for monitoring the fault that the direct-current power supply system cannot be grounded is characterized in that the host master control unit comprises a host master control module and a host storage module, and the host master control module is respectively connected with the voltage acquisition unit, the bus resistance adjustment unit, the communication display unit, the power supply unit and the host storage module; the voltage acquisition unit comprises a voltage division circuit, a linear optocoupler and an amplification filter circuit, wherein the voltage division circuit, the linear optocoupler and the amplification filter circuit are sequentially connected; and the host communication display unit comprises a host communication module and a host display module, and the host communication module and the host display module are both connected with the host master control unit.
4. The system for monitoring the fault that the direct current power supply system cannot be grounded is characterized in that the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit, an auxiliary machine storage unit and an auxiliary machine power supply unit, the auxiliary machine main control unit is connected with the auxiliary machine storage unit and the auxiliary machine communication display unit respectively, and the auxiliary machine power supply unit supplies power to the monitoring auxiliary machine.
5. The system for monitoring the unreliable ground fault of the direct-current power supply system according to claim 4, wherein the auxiliary machine communication display unit comprises an auxiliary machine communication module and an auxiliary machine display unit, and the auxiliary machine communication module and the auxiliary machine display unit are both connected with the auxiliary machine master control unit.
6. The system for monitoring the fault that the direct current power supply system cannot be grounded according to claim 1, 2, 3 or 5, wherein the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, and the line selection power supply unit supplies power to the line selection module.
7. The system for monitoring the fault that the direct current power supply system cannot be grounded is characterized in that the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, and the line selection power supply unit supplies power to the line selection module.
8. The system for monitoring the non-reliable grounding fault of the direct current power supply system according to claim 6, wherein the current acquisition unit comprises a first amplification circuit and a second amplification circuit, and the first amplification circuit is connected with the second amplification circuit; and the line selection master control unit comprises a line selection master control module, a line selection storage module and a fault indication module, and the line selection storage module and the fault indication module are connected with the line selection master control unit.
9. The system for monitoring the non-reliable grounding fault of the direct current power supply system according to claim 7, wherein the current acquisition unit comprises a first amplification circuit and a second amplification circuit, and the first amplification circuit is connected with the second amplification circuit; and the line selection master control unit comprises a line selection master control module, a line selection storage module and a fault indication module, and the line selection storage module and the fault indication module are connected with the line selection master control unit.
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| CN202120848861.0U CN215067203U (en) | 2021-04-23 | 2021-04-23 | Non-reliable grounding fault monitoring system of direct-current power supply system |
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| CN202120848861.0U CN215067203U (en) | 2021-04-23 | 2021-04-23 | Non-reliable grounding fault monitoring system of direct-current power supply system |
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