CN104332975B - Network type mining high-opening comprehensive protection measurement and control device - Google Patents

Network type mining high-opening comprehensive protection measurement and control device Download PDF

Info

Publication number
CN104332975B
CN104332975B CN201410582362.6A CN201410582362A CN104332975B CN 104332975 B CN104332975 B CN 104332975B CN 201410582362 A CN201410582362 A CN 201410582362A CN 104332975 B CN104332975 B CN 104332975B
Authority
CN
China
Prior art keywords
gate
port
input end
switch
output end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410582362.6A
Other languages
Chinese (zh)
Other versions
CN104332975A (en
Inventor
王占华
徐力
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI NANZI CO Ltd
Original Assignee
SHANGHAI NANZI CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI NANZI CO Ltd filed Critical SHANGHAI NANZI CO Ltd
Priority to CN201410582362.6A priority Critical patent/CN104332975B/en
Publication of CN104332975A publication Critical patent/CN104332975A/en
Application granted granted Critical
Publication of CN104332975B publication Critical patent/CN104332975B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a network type mining high-opening comprehensive protection measurement and control device, which relates to the field of measurement and control devices and comprises a shell, wherein a display device, a control device and an alarm device are installed on the shell, the measurement and control device is also arranged in the shell, the measurement and control device is connected with a power grid, the measurement and control device is connected with the display device, the control device, a remote data transmission device, the alarm device and a tripping device, and the control device comprises: an infrared control device, the measurement and control device comprising: the main control chip is connected with an overcurrent protection circuit, an override trip prevention circuit, an overload alarm circuit, an electric leakage protection circuit, a PT disconnection alarm circuit, a zero sequence overvoltage alarm circuit, a low voltage protection circuit, an overvoltage protection circuit, a low frequency protection circuit and a trip circuit. The invention has comprehensive functions and high integration degree, and can realize remote wireless control.

Description

Network type mining high-opening comprehensive protection measurement and control device
Technical Field
The invention relates to a measurement and control device, in particular to a network type mining high-opening comprehensive protection measurement and control device.
Background
The microcomputer monitoring protector is a high-grade multifunctional comprehensive protector for power switch in power supply and transformation system, and can monitor and protect electric network and equipment.
The old mining comprehensive protection monitoring device in the prior art has low integration degree, complex installation and use and incomplete functions.
Disclosure of Invention
The invention discloses a network type mining high-opening comprehensive protection measurement and control device, which is used for solving the problems of low integration degree, complex installation and use and incomplete functions of an old mining comprehensive protection monitoring device in the prior art.
The above purpose of the invention is realized by the following technical scheme:
the utility model provides a mining high comprehensive protection measurement and control device that opens of network type, wherein, includes a casing, install a display device, a controlling means, an alarm device on the casing, still have a measurement and control device in the casing, measurement and control device inserts the electric wire netting, measurement and control device with display device controlling means remote data transmission device alarm device reaches trip gear connects, controlling means includes: an infrared control device, the measurement and control device comprising: the main control chip is connected with an overcurrent protection circuit, an override trip prevention circuit, an overload alarm circuit, an electric leakage protection circuit, a PT disconnection alarm circuit, a zero sequence overvoltage alarm circuit, a low voltage protection circuit, an overvoltage protection circuit, a low frequency protection circuit and a trip circuit.
As above-mentioned mining high comprehensive protection device that opens of network type, wherein, measurement and control device still includes: and the main control chip is also connected with a shielded cable insulation monitoring and protecting device, an abnormal alarm device, a measuring device and a recording device.
The network type mining high-voltage switch comprehensive protection device is characterized in that the main control chip is connected with a remote data transceiver.
The network type mining high-voltage switch comprehensive protection device comprises: a current quick-break circuit, a time-limit quick-break circuit and an overcurrent protection circuit; the current quick-break circuit comprises a first OR gate, the input end of the first OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the first OR gate is connected with a first switch, and the first switch is connected with the alarm device and the trip circuit; the time-limited quick-break circuit comprises a second OR gate, the input end of the second OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the second OR gate is connected with a second switch and a timer, and the output end of the timer is connected with the alarm device and the trip circuit; the overcurrent protection circuit comprises a line voltage judgment port, a PT disconnection signal port and a negative sequence voltage judgment port, and the input end of a third OR gate is respectively connected with the line voltage judgment port, the PT disconnection signal port and the negative sequence voltage judgment port; two input ends of a first AND gate are respectively connected with the line voltage judging port and the negative sequence voltage judging port, and the output end of the first AND gate is connected with the input end of the third OR gate; the input end of the fourth OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the fourth OR gate is provided with a third switch, the third OR gate and the fourth OR gate are connected with the input end of a second AND gate, the output end of the second AND gate is connected with a second timer and an IDMT relay in parallel, the second timer is connected with a fourth switch in series, a fifth switch is connected with the IDMT relay in series, and the second timer is connected with the output end of the IDMT relay in parallel and then is connected with the alarm device and the trip circuit.
The network type mining high-open comprehensive protection device as described above, wherein the overload warning circuit includes: the input end of the fifth OR gate obtains current from the power grid through the three-phase current judgment port, the output end of the fifth OR gate is sequentially connected with a sixth switch and a third timer in series, and the output end of the third timer is connected with the alarm device.
The network type mining high-open comprehensive protection device comprises: the input end of a first NOT gate is connected with the seventh switch, the input end of a third AND gate is connected with the seventh switch and the first zero-sequence voltage judging port, and the output ends of the first NOT gate and the third AND gate are both connected with the input end of a sixth OR gate; the input end of a second NOT gate is connected with the eighth switch, the input end of a fourth AND gate is connected with the eighth switch and the zero sequence direction judgment input end, and the output ends of the second NOT gate and the fourth AND gate are both connected with the input end of a seventh OR gate; the input end of a fifth AND gate is connected with the sixth OR gate, the seventh OR gate and the zero-sequence current judging port, the output end of the fifth AND gate is connected with a fourth timer, and the output end of the fourth timer is connected with the alarm device and the tripping device.
The network type mining high-voltage switch comprehensive protection device comprises the following components: the three-phase current judging port is connected with the input end of a sixth AND gate, the input end of an eighth OR gate is connected with the three-phase current judging port, the input end of a seventh AND gate is connected with the output ends of the sixth AND gate and the eighth OR gate, the input end of a ninth OR gate is connected with the output end of the seventh AND gate and the negative sequence voltage judging port, the output end of the ninth OR gate is connected with a ninth switch and a fifth timer, and the output end of the fifth timer is connected with the alarm device and the trip device.
The network type mining high-open comprehensive protection device as described above, wherein the zero sequence overvoltage protection circuit includes: the input end of an eighth AND gate is respectively connected with the tenth switch and the second zero-sequence voltage judging port, the output end of the second zero-sequence voltage judging port is connected with a sixth timer, and the output end of the sixth timer is connected with the alarm device and the trip device.
The network type mining high-open comprehensive protection device as described above, wherein the low-voltage protection circuit includes: the first three-phase voltage judgment port is connected with the input end of a ninth AND gate; the PT disconnection alarm circuit is connected with the trip position port, the PT disconnection port is connected with the PT disconnection alarm circuit, the input end of a first NOR gate is connected with the trip position port and the PT disconnection port, the output end of a ninth AND gate is connected with the output end of the first NOR gate and the input end of a tenth AND gate, the output end of the tenth AND gate is connected with an eleventh switch and a seventh timer in series, and the output end of the seventh timer is connected with the alarm device and the trip device;
the overvoltage protection circuit includes: the trip control circuit comprises a second three-phase voltage judging port, a trip position port, a tenth OR gate, a third NOT gate, an eleventh AND gate, a twelfth switch and an eighth timer, wherein the input end of the tenth OR gate is connected with the second three-phase voltage judging port, the input end of the third NOT gate is connected with the trip position port, the output ends of the third NOT gate and the tenth OR gate are connected with the output end of the eleventh AND gate, the output end of the eleventh AND gate is connected with the twelfth switch and the eighth timer in series, and the output end of the eighth timer is connected with the alarm device and the trip device.
The network type mining high-open comprehensive protection device as described above, wherein the low-frequency protection circuit includes: the input end of a fourth NOT gate is connected with the thirteenth switch, the input end of a twelfth AND gate is connected with the thirteenth switch and the third three-phase voltage judging port, and the input port of an eleventh OR gate is connected with the input ports of the fourth NOT gate and the twelfth AND gate; the input end of a fifth NOT gate is connected with the fourteenth switch, the input end of a thirteenth AND gate is connected with the fourteenth switch and the slip port, the input end of a twelfth OR gate is connected with the output ends of the fifth NOT gate and the thirteenth AND gate, the input end of a fourteenth AND gate is connected with the twelfth OR gate and the slip port, the output end of the fourteenth AND gate is connected with a fifteenth switch, the input end of a fifteenth AND gate is connected with the input ends of the fifteenth switch and the eleventh OR gate, the output end of the eleventh OR gate is connected with the input end of a ninth timer, and the output end of the ninth timer is connected with the alarm device and the trip device.
In conclusion, due to the adoption of the technical scheme, the mining comprehensive protection monitoring device solves the problems of low integration degree, complex installation and use and incomplete functions of the old mining comprehensive protection monitoring device in the prior art, has comprehensive functions and high integration degree, and can realize remote wireless control.
Drawings
FIG. 1 is a logic block diagram of a current quick-break circuit of the network type mining high-voltage switch integrated protection measurement and control device;
FIG. 2 is a logic block diagram of a time-limited quick-break circuit of the network type mining high-voltage switch integrated protection measurement and control device;
FIG. 3 is a logic block diagram of an overcurrent protection circuit of the network type mining high-open comprehensive protection measurement and control device;
FIG. 4 is a schematic diagram of override trip prevention of the network type mining high-voltage switch comprehensive protection measurement and control device;
FIG. 5 is a logic block diagram of an overload warning circuit of the network type mining high-open comprehensive protection measurement and control device;
FIG. 6 is a logic block diagram of a leakage protection circuit of the network type mining high-voltage switch integrated protection measurement and control device;
FIG. 7 is a logic block diagram of a PT disconnection warning circuit of the network type mining high-voltage switch integrated protection measurement and control device;
FIG. 8 is a logic block diagram of a zero sequence overvoltage alarm circuit of the network type mining high-voltage comprehensive protection measurement and control device;
FIG. 9 is a logic block diagram of a low-voltage protection circuit of the network type mining high-voltage integrated protection measurement and control device;
FIG. 10 is a logic block diagram of an overvoltage protection circuit of the network type mining high-open comprehensive protection measurement and control device;
fig. 11 is a logic block diagram of a low-frequency protection circuit of the network type mining high-open comprehensive protection measurement and control device.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the utility model provides a mining high comprehensive protection measurement and control device that opens of network type, wherein, includes a casing, installs a display device, a controlling means, an alarm device on the casing, still has a measurement and control device in the casing, and measurement and control device inserts the electric wire netting, and measurement and control device is connected with display device, controlling means, remote data transmission device, alarm device and trip gear, and controlling means includes: an infrared control device, the measurement and control device comprising: the main control chip is connected with an overcurrent protection circuit, an override trip prevention circuit, an overload alarm circuit, an electric leakage protection circuit, a PT disconnection alarm circuit, a zero sequence overvoltage alarm circuit, a low voltage protection circuit, an overvoltage protection circuit, a low frequency protection circuit and a trip circuit.
The measurement and control device of the invention also comprises: the main control chip is also connected with a shielded cable insulation monitoring and protecting device, an abnormal alarm device, a measuring device and a recording device.
The main control chip of the invention is connected with a remote data transceiver.
Fig. 1 is a logic block diagram of a current quick-break circuit of a network type mining high-open comprehensive protection and measurement and control device, fig. 2 is a logic block diagram of a time-limited quick-break circuit of the network type mining high-open comprehensive protection and measurement and control device, fig. 3 is a logic block diagram of an overcurrent protection circuit of the network type mining high-open comprehensive protection and measurement and control device, please refer to fig. 1 to fig. 3, and the overcurrent protection circuit comprises: a current quick-break circuit, a time-limit quick-break circuit and an overcurrent protection circuit; the current quick-break circuit comprises a first OR gate, the input end of the first OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the first OR gate is connected with a first switch, and the first switch is connected with the alarm device and the trip circuit; the time-limited quick-break circuit comprises a second OR gate, the input end of the second OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the second OR gate is connected with a second switch and a timer, and the output end of the timer is connected with the alarm device and the trip circuit; the overcurrent protection circuit comprises a line voltage judgment port, a PT disconnection signal port and a negative sequence voltage judgment port, wherein the input end of a third OR gate is respectively connected with the line voltage judgment port, the PT disconnection signal port and the negative sequence voltage judgment port; two input ends of a first AND gate are respectively connected with the line voltage judging port and the negative sequence voltage judging port, and the output end of the first AND gate is connected with the input end of a third OR gate; the input end of the fourth OR gate obtains current from a power grid through a three-phase current judgment port, the output end of the fourth OR gate is provided with a third switch, the third OR gate and the fourth OR gate are connected with the input end of a second AND gate, the output end of the second AND gate is connected with a second timer and an IDMT relay in parallel, the second timer is connected with a fourth switch in series, the IDMT relay is connected with a fifth switch in series, and the second timer is connected with the output end of the IDMT relay in parallel and then is connected with the alarm device and the trip circuit.
Aiming at the maximum value of the A, C (or A, B, C) phase current fundamental wave, when any phase reaches a setting value, a timer is started, if the setting time limit is continuously reached and the corresponding protection on-off control word is in an on state, the device sends a tripping control signal and records and uploads a corresponding SOE event. And resetting the timer if the current returns within the setting time limit. The overcurrent protection can be locked through the composite voltage, the inverse time limit tripping can be selected, and according to the specification of the international electrotechnical commission standard (IEC60255-4), the device can select three inverse time limit characteristics in a standard inverse time limit characteristic equation: can be selected by constant value
General inverse time-limited property equation (IDMT):
Figure GDA0002169090550000051
very inverse time-limited property equation (IDMT):
Figure GDA0002169090550000052
extreme inverse time-limited characteristic equation (IDMT):
Figure GDA0002169090550000053
wherein Ip is a current reference value, and an overcurrent constant value, tpAnd taking the overcurrent time as a constant value.
Fig. 4 is a schematic diagram of override trip prevention of the network type mining high-voltage switch integrated protection measurement and control device, please refer to fig. 4, and the override trip prevention circuit of the invention CAN specifically realize the override trip prevention function through the connection of optical fibers and a CAN between the devices. When the lower-level protection detects the sudden change of the protection current of the device, the device immediately sends an accident signal to the upper-level protection device through the CAN or the optical fiber, and the upper-level protection which receives the accident signal immediately locks the quick-break protection of the device for a short time delay (the fixed value CAN be set) to wait for the tripping of the lower-level protection. After the time delay, if the fault current does not disappear, the upper-level protection trips. In the following figures, the present-level incoming line protection is the upper level of the present-level feeder line protection, and the upper-level feeder line protection is the upper level of the lower-level incoming line protection. The line position is used for setting up the superior and inferior communication functions of each protector, CAN light-emitting fiber is received when setting as 1, CAN light-emitting fiber is received when setting as 2, CAN light-emitting fiber is not sent when setting as 3, when communication abnormity occurs, the superior device main interface will have the communication abnormity to indicate.
Fig. 5 is a logic block diagram of an overload warning circuit of the network type mining high-open comprehensive protection measurement and control device, please refer to fig. 5, the overload warning circuit includes: and the input end of the fifth OR gate obtains current from the power grid through the three-phase current judgment port, the output end of the fifth OR gate is sequentially connected with a sixth switch and a third timer in series, and the output end of the third timer is connected with the alarm device.
Aiming at the maximum value of the fundamental wave of the phase current of A, C (or A, B, C), when any phase reaches an overload setting value, a timer is started, and if the duration reaches a setting time limit, an alarm is given. If the current returns within the setting time limit, the timer is reset, and the alarm or the tripping operation can be selected.
Fig. 6 is a logic block diagram of a leakage protection circuit of the network type mining high-voltage comprehensive protection measurement and control device, please refer to fig. 6, the leakage protection circuit includes: the input end of a first NOT gate is connected with the seventh switch, the input end of a third AND gate is connected with the seventh switch and the first zero sequence voltage judging port, and the output ends of the first NOT gate and the third AND gate are both connected with the input end of a sixth OR gate; the input end of a second NOT gate is connected with the eighth switch, the input end of a fourth AND gate is connected with the eighth switch and the zero sequence direction judgment input end, and the output ends of the second NOT gate and the fourth AND gate are both connected with the input end of a seventh OR gate; the input end of a fifth AND gate is connected with the sixth OR gate, the seventh OR gate and the zero-sequence current judging port, the output end of the fifth AND gate is connected with a fourth timer, and the output end of the fourth timer is connected with the alarm device and the trip device.
The leakage protection is that when the zero sequence current measured value is larger than the leakage protection fixed value, the timer is started, if the zero sequence current measured value is continued to the corresponding setting time limit and the leakage protection on-off control word is in the on-state, an alarm signal is sent out. And if the protection trip on-off control word is also in an on state, the breaker is tripped off, and a corresponding SOE event is recorded and uploaded. And resetting the timer if the current returns within the setting time limit.
Fig. 7 is a logic block diagram of a PT disconnection warning circuit of the network type mining high-voltage switch integrated protection measurement and control device of the present invention, please refer to fig. 7, the PT disconnection warning circuit includes: the three-phase current judging port is connected with the first phase voltage judging port, the third phase current judging port is connected with the second phase voltage judging port, the third phase current judging port is connected with the third phase voltage judging port, the fourth and-gate is connected with the third or-gate, the seventh and-gate is connected with the sixth and-gate and the eighth or-gate, the ninth or-gate is connected with the seventh and-gate and the negative sequence voltage judging port, the ninth or-gate is connected with the ninth switch and the fifth timer, and the fifth timer is connected with the alarm device and the trip device.
In one embodiment of the present invention, to prevent protection malfunction due to abnormal detection of a voltage value by a CPU due to PT disconnection, the device is provided with a PT disconnection checking function and can be tripped or withdrawn by a protection control word. Any one of the following conditions is met, and PT disconnection is reported: a, the maximum line voltage is less than 30V, and any phase current is greater than 0.2A; b, the negative sequence voltage is more than 8V;
fig. 8 is a logic block diagram of a zero sequence overvoltage alarm circuit of the network type mining high-voltage integrated protection measurement and control device, please refer to fig. 8, the zero sequence overvoltage protection circuit includes: the input end of an eighth AND gate is respectively connected with the tenth switch and the second zero sequence voltage judging port, the output end of the second zero sequence voltage judging port is connected with a sixth timer, and the output end of the sixth timer is connected with the alarm device and the trip device.
The zero sequence voltage measured in the measuring channel of the invention is greater than the zero sequence voltage fixed value, and the alarm is given out by time delay. The logic diagram is shown (in the figure, U0dz2 is a zero sequence voltage fixed value, and t0zd4 is a time fixed value).
Fig. 9 is a logic block diagram of a low-voltage protection circuit of the network type mining high-voltage integrated protection measurement and control device, please refer to fig. 9, the low-voltage protection circuit includes: the first three-phase voltage judgment port is connected with the input end of a ninth AND gate; the trip position port and the PT disconnection port are connected with the PT disconnection alarm circuit, the input end of a first NOR gate is connected with the trip position port and the PT disconnection port, the output end of a ninth AND gate and the output end of the first NOR gate are connected with the input end of a tenth AND gate, the output end of the tenth AND gate is connected with an eleventh switch and a seventh timer in series, and the output end of the seventh timer is connected with the alarm device and the trip device;
and when the time exceeds the setting time, the low-voltage protection acts. The low voltage protection is locked by TWJ, the device can automatically identify PT broken line and lock the low voltage protection (at the moment, PT broken line needs to be put into use).
Fig. 10 is a logic block diagram of an overvoltage protection circuit of the network type mining high-open comprehensive protection measurement and control device, please refer to fig. 10, the overvoltage protection circuit includes: the system comprises a second three-phase voltage judging port, a trip position port, a tenth OR gate, a third NOT gate, a twelfth switch, an eighth timer and an alarm device, wherein the input end of the tenth OR gate is connected with the second three-phase voltage judging port, the input end of the third NOT gate is connected with the trip position port, the output ends of the third NOT gate and the tenth OR gate are connected with the output end of an eleventh AND gate, the output end of the eleventh AND gate is connected with the twelfth switch and the eighth timer in series, and the output end of the eighth timer is connected with the alarm device and the trip device.
Any phase of the three interphase voltages is larger than the overvoltage protection fixed value, and when the time exceeds the setting time, the overvoltage protection acts.
Fig. 11 is a logic block diagram of a low-frequency protection circuit of the network type mining high-open comprehensive protection measurement and control device, please refer to fig. 11, the low-frequency protection circuit includes: the input end of a fourth NOT gate is connected with the thirteenth switch, the input end of a twelfth AND gate is connected with the thirteenth switch and the third three-phase voltage judging port, and the input port of an eleventh OR gate is connected with the input ports of the fourth NOT gate and the twelfth AND gate; the input end of a fifth NOT gate is connected with the fourteenth switch, the input end of a thirteenth AND gate is connected with the fourteenth switch and the slip port, the input end of a twelfth OR gate is connected with the output ends of the fifth NOT gate and the thirteenth AND gate, the input end of a fourteenth AND gate is connected with the twelfth OR gate and the slip port, the output end of the fourteenth AND gate is connected with a fifteenth switch, the input end of a fifteenth AND gate is connected with the input ends of the fifteenth switch and the eleventh OR gate, the output end of the eleventh OR gate is connected with the input end of a ninth timer, and the output end of the ninth timer is connected with the alarm device and the trip device. And when the frequency of the system is detected to be lower than the low-frequency load shedding frequency value and the voltage is detected to be higher than the low-voltage locking fixed value (if the low-voltage locking is put into use), the operation is carried out after time delay.
The specific working process of the shielded cable insulation monitoring and protecting device can be as follows: when the insulation resistance Rd between the shielded cable core and the shielded cable ground decreases to:
when Rd is less than 3K omega, the protection acts reliably;
when Rd is more than 5.5K omega, the protection is reliable and does not act;
when the loop resistance value Rk between the shielded cable core and the shielded cable ground decreases to:
when Rk is greater than 1.5K omega, the protection acts reliably;
when Rk is less than 0.8K omega, the protection is reliable and does not act;
the action time is as follows: 100ms
The abnormality warning device of the present invention is specifically: abnormality of the apparatus: when the power supply disappears or the self-checking is wrong (the ROM, the RAM and the EPROM are wrong in definite value checking), the relay is locked and opened.
The measuring device of the invention is specifically: and the frequency f, the voltages Uab, Ubc, Uca, Ua, Ub and Uc, the currents Ia, Ib and Ic, the active power, the reactive power, the power factor, the 3I0 and the 3U0 and the insulation resistance R of the measuring system are uploaded to an upper computer.
The recording apparatus of the present invention is specifically: records of not less than 60 times, including event date, time, accident current (voltage), type of protection action, etc. may be stored and communicated to a management system or monitoring system.

Claims (9)

1. The utility model provides a mining high comprehensive protection measurement and control device that opens of network type, a serial communication port, includes a casing, install a display device, a controlling means, an alarm device on the casing, a measurement and control device still has in the casing, measurement and control device inserts the electric wire netting, measurement and control device with display device controlling means, remote data transmission device alarm device and tripping device connect, controlling means includes: an infrared control device, the measurement and control device comprising: the main control chip is connected with an overcurrent protection circuit, an override trip prevention circuit, an overload alarm circuit, an electric leakage protection circuit, a PT (potential transformer) disconnection alarm circuit, a zero sequence overvoltage alarm circuit, a low voltage protection circuit, an overvoltage protection circuit, a low frequency protection circuit and a trip circuit; the PT disconnection warning circuit includes: the three-phase current judging port is connected with the input end of a sixth AND gate, the input end of an eighth OR gate is connected with the three-phase current judging port, the input end of a seventh AND gate is connected with the output ends of the sixth AND gate and the eighth OR gate, the input end of a ninth OR gate is connected with the output end of the seventh AND gate and the negative sequence voltage judging port, the output end of the ninth OR gate is connected with a ninth switch and a fifth timer, and the output end of the fifth timer is connected with the alarm device and the trip device.
2. The network type mining high-open comprehensive protection measurement and control device according to claim 1, further comprising: and the main control chip is also connected with a shielded cable insulation monitoring and protecting device, an abnormal alarm device, a measuring device and a recording device.
3. The network type mining high-opening comprehensive protection measurement and control device according to claim 1, characterized in that the main control chip is connected with a remote data transceiver.
4. The network type mining high-open comprehensive protection measurement and control device according to claim 1, wherein the overcurrent protection circuit comprises: a current quick-break circuit and a time-limited quick-break circuit; the current quick-break circuit comprises a first OR gate, the input end of the first OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the first OR gate is connected with a first switch, and the first switch is connected with the alarm device and the trip circuit; the time-limited quick-break circuit comprises a second OR gate, the input end of the second OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the second OR gate is connected with a second switch and a timer, and the output end of the timer is connected with the alarm device and the trip circuit; the overcurrent protection circuit comprises a line voltage judgment port, a PT disconnection signal port and a negative sequence voltage judgment port, and the input end of a third OR gate is respectively connected with the line voltage judgment port, the PT disconnection signal port and the negative sequence voltage judgment port; two input ends of a first AND gate are respectively connected with the line voltage judging port and the negative sequence voltage judging port, and the output end of the first AND gate is connected with the input end of the third OR gate; the input end of the fourth OR gate obtains current from the power grid through a three-phase current judgment port, the output end of the fourth OR gate is provided with a third switch, the third OR gate and the fourth OR gate are connected with the input end of a second AND gate, the output end of the second AND gate is connected with a second timer and an IDMT relay in parallel, the second timer is connected with a fourth switch in series, a fifth switch is connected with the IDMT relay in series, and the second timer is connected with the output end of the IDMT relay in parallel and then is connected with the alarm device and the trip circuit.
5. The network type mining high-open comprehensive protection measurement and control device according to claim 1, wherein the overload warning circuit comprises: the input end of the fifth OR gate obtains current from the power grid through the three-phase current judgment port, the output end of the fifth OR gate is sequentially connected with a sixth switch and a third timer in series, and the output end of the third timer is connected with the alarm device.
6. The network type mining high-open comprehensive protection measurement and control device according to claim 1, wherein the electric leakage protection circuit comprises: the input end of a first NOT gate is connected with the seventh switch, the input end of a third AND gate is connected with the seventh switch and the first zero-sequence voltage judging port, and the output ends of the first NOT gate and the third AND gate are both connected with the input end of a sixth OR gate; the input end of a second NOT gate is connected with the eighth switch, the input end of a fourth AND gate is connected with the eighth switch and the zero sequence direction judgment input end, and the output ends of the second NOT gate and the fourth AND gate are both connected with the input end of a seventh OR gate; the input end of a fifth AND gate is connected with the sixth OR gate, the seventh OR gate and the zero-sequence current judging port, the output end of the fifth AND gate is connected with a fourth timer, and the output end of the fourth timer is connected with the alarm device and the tripping device.
7. The network type mining high-open comprehensive protection measurement and control device according to claim 6, characterized in that the zero-sequence overvoltage protection circuit comprises: the input end of an eighth AND gate is respectively connected with the tenth switch and the second zero-sequence voltage judging port, the output end of the second zero-sequence voltage judging port is connected with a sixth timer, and the output end of the sixth timer is connected with the alarm device and the trip device.
8. The network type mining high-open comprehensive protection measurement and control device according to claim 1, wherein the low-voltage protection circuit comprises: the first three-phase voltage judgment port is connected with the input end of a ninth AND gate; the PT disconnection alarm circuit is connected with the trip position port, the PT disconnection port is connected with the PT disconnection alarm circuit, the input end of a first NOR gate is connected with the trip position port and the PT disconnection port, the output end of a ninth AND gate is connected with the output end of the first NOR gate and the input end of a tenth AND gate, the output end of the tenth AND gate is connected with an eleventh switch and a seventh timer in series, and the output end of the seventh timer is connected with the alarm device and the trip device;
the overvoltage protection circuit includes: the trip control circuit comprises a second three-phase voltage judging port, a trip position port, a tenth OR gate, a third NOT gate, an eleventh AND gate, a twelfth switch and an eighth timer, wherein the input end of the tenth OR gate is connected with the second three-phase voltage judging port, the input end of the third NOT gate is connected with the trip position port, the output ends of the third NOT gate and the tenth OR gate are connected with the output end of the eleventh AND gate, the output end of the eleventh AND gate is connected with the twelfth switch and the eighth timer in series, and the output end of the eighth timer is connected with the alarm device and the trip device.
9. The network type mining high-open comprehensive protection measurement and control device according to claim 1, wherein the low-frequency protection circuit comprises: the input end of a fourth NOT gate is connected with the thirteenth switch, the input end of a twelfth AND gate is connected with the thirteenth switch and the third three-phase voltage judging port, and the input port of an eleventh OR gate is connected with the input ports of the fourth NOT gate and the twelfth AND gate; the input end of a fifth NOT gate is connected with the fourteenth switch, the input end of a thirteenth AND gate is connected with the fourteenth switch and the slip port, the input end of a twelfth OR gate is connected with the output ends of the fifth NOT gate and the thirteenth AND gate, the input end of a fourteenth AND gate is connected with the twelfth OR gate and the slip port, the output end of the fourteenth AND gate is connected with a fifteenth switch, the input end of a fifteenth AND gate is connected with the input ends of the fifteenth switch and the eleventh OR gate, the output end of the eleventh OR gate is connected with the input end of a ninth timer, and the output end of the ninth timer is connected with the alarm device and the trip device.
CN201410582362.6A 2014-10-28 2014-10-28 Network type mining high-opening comprehensive protection measurement and control device Active CN104332975B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410582362.6A CN104332975B (en) 2014-10-28 2014-10-28 Network type mining high-opening comprehensive protection measurement and control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410582362.6A CN104332975B (en) 2014-10-28 2014-10-28 Network type mining high-opening comprehensive protection measurement and control device

Publications (2)

Publication Number Publication Date
CN104332975A CN104332975A (en) 2015-02-04
CN104332975B true CN104332975B (en) 2020-03-27

Family

ID=52407652

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410582362.6A Active CN104332975B (en) 2014-10-28 2014-10-28 Network type mining high-opening comprehensive protection measurement and control device

Country Status (1)

Country Link
CN (1) CN104332975B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107346879A (en) * 2016-05-06 2017-11-14 中国石油化工股份有限公司 Comprehensive protector
CN107332205A (en) * 2017-07-17 2017-11-07 日照南瑞电气科技有限公司 A kind of mining flameproof feed switch protection device
CN107332200A (en) * 2017-07-17 2017-11-07 日照南瑞电气科技有限公司 A kind of illumination sign intelligent comprehensive protection device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6832169B2 (en) * 2002-01-29 2004-12-14 Hitachi, Ltd. Substation system
CN101459336A (en) * 2008-05-19 2009-06-17 河南省电力公司 GOOSE mode network low frequency deloading method based on digital transmission network
CN101820185A (en) * 2009-02-26 2010-09-01 西北电网有限公司 Power grid fault judgment method based on IEC61850 signal semantic logic
CN202548237U (en) * 2012-04-01 2012-11-21 上海市电力公司 Simulated device for overload protection of series capacitors of fault current limiters (FCL)
CN103107602A (en) * 2013-03-01 2013-05-15 上海久创电气自动化设备有限公司 Mine protection power monitoring system
CN204407874U (en) * 2014-10-28 2015-06-17 上海南自科技股份有限公司 Network-type is mining, and height opens integrated protection and monitoring device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6832169B2 (en) * 2002-01-29 2004-12-14 Hitachi, Ltd. Substation system
CN101459336A (en) * 2008-05-19 2009-06-17 河南省电力公司 GOOSE mode network low frequency deloading method based on digital transmission network
CN101820185A (en) * 2009-02-26 2010-09-01 西北电网有限公司 Power grid fault judgment method based on IEC61850 signal semantic logic
CN202548237U (en) * 2012-04-01 2012-11-21 上海市电力公司 Simulated device for overload protection of series capacitors of fault current limiters (FCL)
CN103107602A (en) * 2013-03-01 2013-05-15 上海久创电气自动化设备有限公司 Mine protection power monitoring system
CN204407874U (en) * 2014-10-28 2015-06-17 上海南自科技股份有限公司 Network-type is mining, and height opens integrated protection and monitoring device

Also Published As

Publication number Publication date
CN104332975A (en) 2015-02-04

Similar Documents

Publication Publication Date Title
EP2695267B1 (en) Fast breaker failure detection for hvdc circuit breakers
CN103560479A (en) Load circuit fault detection circuit and method applied to breaker reclosing
KR101451387B1 (en) The Switchboard with the device of sensing open state of the secondary terminal and protecting of a current transformer
CN108776283A (en) A kind of CT not exclusively lower power distribution network single-phase disconnection fault judgment method of configuration with judge system
CN104332975B (en) Network type mining high-opening comprehensive protection measurement and control device
CN104037738A (en) 3/2 wiring T-region short lead wire differential protection starting method and differential protection method
CN107294071A (en) The guard method of power distribution network small resistance grounding system and device
CN203522122U (en) Load line fault detection circuit applied to circuit breaker reclosing
CN103606889A (en) Secondary side overcurrent protection circuit of electric arc furnace transformer
KR101245748B1 (en) Hybrid harmonic reduction device equipped with over-current, over-heat and surge protection functions
KR100885632B1 (en) Intelligent Surge Protective Devide
CN103855698A (en) Novel surge protection device
CN105529681A (en) Leakage protection circuit for low-voltage ungrounded system and realization method
CN107634506B (en) A kind of substation's overcurrent protection method and device and system
CN203180512U (en) Low tension side power supply surge protector
CN109103846B (en) Energy extraction reactor protection method and system based on phase comparison and amplitude comparison principle
US11342739B2 (en) Monitoring and protection device of power distribution transformers on the low voltage side
CN203617704U (en) Equipotential cutoff anti-thunder multifunctional power-source-protecting circuit
CN102938556B (en) With the capacitor protection measurement and control integration device of unbalanced current protection function
CN202495803U (en) Isolation power supply cabinet used in medical treatment II type place
CN105098736A (en) Buscouple protection method with outgoing line reactor
CN204407874U (en) Network-type is mining, and height opens integrated protection and monitoring device
CN205178521U (en) Three -phase balance high pressure metering device
CN207603190U (en) A kind of zero line over-current protective device
KR101473224B1 (en) Power distribution board for preventing of black out and arc fault

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant