CN217590373U - Online temperature monitoring and explosion-proof system for power industry - Google Patents
Online temperature monitoring and explosion-proof system for power industry Download PDFInfo
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- CN217590373U CN217590373U CN202221022561.8U CN202221022561U CN217590373U CN 217590373 U CN217590373 U CN 217590373U CN 202221022561 U CN202221022561 U CN 202221022561U CN 217590373 U CN217590373 U CN 217590373U
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Abstract
The patent of the utility model provides an online temperature monitoring and explosion-proof system for electric power industry discloses an online temperature monitoring and explosion-proof system for electric power industry. The utility model discloses an online temperature monitoring and explosion-proof system to electric power industry, the utility model discloses a current unit, arc light unit and wireless temperature acquisition unit, small in size, the guide rail installation, three phase current monitors simultaneously, acceptable 100 ~ 240Vac dc power input, can gather 3*4 way wireless temperature sensor signal, the tripping operation logic is various, there are 2 large capacity tripping operation output contacts, 1 way is reported an emergency and asked for help or increased vigilance the contact output, friendly LCD screen display for the human-computer interface, from taking RS485 communication port, support MODBUS communication protocol, can take notes 16 SOE incidents, thereby satisfy the monitored temperature and the explosion-proof requirement that the electric power industry used in complicated real environment.
Description
Technical Field
The utility model relates to an explosion-proof field of electric power industry temperature rise monitoring, concretely relates to electric power industry is with online temperature monitoring and explosion-proof system.
Background
In recent years, with the rapid increase of power loads, accidents such as fire and large-area power failure due to heat generation of medium-voltage switch cabinets often occur in substations. The main reason is that metal corrosion, metal abrasion, coating layer failure, joint pressure mismatching and other results can be caused in the long-term operation process of each main electrical equipment connection point in the switch cabinet, and finally the contact resistance of each connection point is increased, the contact is poor and the temperature rise is intensified; due to the fact that high temperature causes cable insulation aging, electric arc breakdown causes power failure and fire accidents.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, online temperature monitoring and explosion-proof system to the electric power industry is proposed, the utility model discloses a current unit, arc light unit and wireless temperature acquisition unit, small in size, the guide rail installation, three phase current monitors simultaneously, acceptable 100 ~ 240Vac dc power input, can gather 3*4 way wireless temperature sensor signal, the tripping operation logic is various, there are 2 large capacity tripping operation output contacts, 1 way is reported an emergency and asked for help or increased vigilance contact output, friendly LCD screen display for human-computer interface, from taking RS485 communication port, support MODBUS communication protocol, can take 16 SOE incidents, thereby satisfy the monitoring temperature and the explosion-proof requirement that the electric power industry used in complicated real environment, be particularly suitable for practical and popularization in actual electric power industry.
The utility model discloses and through in some embodiments, the following technical scheme of accessible realizes:
the utility model discloses an online temperature monitoring and explosion-proof system for the power industry, which is configured with a current protection unit, an arc light protection unit and a temperature protection unit;
further, the current protection unit, the arc light protection unit and the temperature protection unit are respectively electrically connected with the control module;
the current protection unit comprises an overcurrent logic protection circuit for judging whether the circuit current collected in real time is overcurrent or not and an overload protection logic circuit for judging whether the circuit load collected is overloaded or not;
the temperature protection unit comprises a temperature protection logic circuit which judges a temperature signal detected by the temperature sensor and prevents temperature sudden change maloperation;
the arc protection unit comprises an arc protection logic circuit for collecting whether arc light appears or not;
the overcurrent logic protection circuit, the overload protection logic circuit, the temperature mutation locking logic circuit and the arc light protection logic circuit are respectively and electrically connected with the control module;
the control module is respectively electrically connected with the relay, the LCD display screen and the RS485 communication port;
and the RS485 communication port is in wireless connection with an upper computer.
In the scheme, when the current protection unit judges overcurrent or overload, the temperature protection unit judges overtemperature and the arc light protection unit judges that abnormality occurs, a control signal '1' is output, the control chip controls the relay to act to cut off the electric brake, the LCD displays the abnormality and transmits an abnormality report to the upper computer through the RS485 communication port.
Further, the overcurrent logic protection circuit comprises a three-phase current detection circuit I-PNP which is electrically connected with the input of an OR gate 1, the output of the OR gate and the rated current PNE are respectively electrically connected with the input of an AND gate 2, the output of the AND gate 2 is connected with an action time delay module PND with adjustable overcurrent, and an overcurrent protection action PN0 is output.
In the scheme, after threshold currents are respectively set for Ia, ib and Ic and PNP are compared, if the threshold currents are larger than the set currents, the three-phase current detection circuit is logic '1', the three-phase current detection circuit is electrically connected with an input of an OR gate, any one of the three-phase current detection circuit is '1', the output of the OR gate is '1', and Ia, ib and Ic all output '0' during normal operation.
The output of the OR gate and the rated current are respectively electrically connected with the input of the AND gate, the output of the AND gate is connected with the action delay module with adjustable overcurrent, the alarm is given when the output is 0, the trip is carried out when the output is set to be 1, and the output overcurrent protection action is controlled.
Wherein PNP and N represent three-phase currents of different circuits.
Further, the overload protection logic circuit comprises a three-phase current load detection circuit I-PP electrically connected with an input of an OR gate 3, an output of the OR gate 3 and a rated current PE are respectively electrically connected with an input of an AND gate 4, an output of the AND gate 4 is connected with an action delay module PD with adjustable overcurrent, and an overload protection action P0 is output.
In the scheme, after threshold current loads PP are respectively set for Ia, ib and Ic of the three-phase current load detection circuit, if the threshold current loads PP are compared with the threshold current loads Ia, ib and Ic, the three-phase current load detection circuit is logic '1' if the threshold current loads PP are larger than the set current, the three-phase current load detection circuit is electrically connected with an input of an OR gate, any one of the three-phase current load detection circuit is '1', the output of the OR gate is '1', and Ia, ib and Ic all output '0' during normal operation.
The output of the OR gate and the rated current are respectively electrically connected with the input of the AND gate, the output of the AND gate is connected with the action delay module with adjustable overcurrent, when the output is 0, the alarm is given, and when the output is 1, the trip is carried out to control the output overcurrent protection action.
Further, the temperature protection logic circuit Tn-Temp comprises a three-phase upper temperature detection circuit electrically connected with an input of an OR gate 5, an output of the OR gate 5 and a rated temperature Temp are respectively electrically connected with an input of an AND gate 6, a three-phase upper mutation temperature detection circuit TSn-TSP is electrically connected with an input of an OR gate 7, an output of the OR gate 7 and a rated mutation temperature TSnE are respectively electrically connected with an input of an AND gate 8, an output of the AND gate 8 is electrically connected with a delay 10s module and then outputs a mutation temperature TS0, an output of the AND gate 8 is electrically connected with an input of an NAND gate 9, an output of the NOT gate 9 is electrically connected with an input of the AND gate 6, an output of the AND gate 6 is connected with a temperature-adjustable action delay module and outputs a temperature protection action Temp0.
In the scheme, the device can monitor 12 wireless temperature signals, and 4 groups are provided. Tn is T1, T2, T3, T4 respectively, and is customized by the user according to the installation position. The temperature protection function is realized by fixed values of a temperature out-of-limit protection function temperature group 1, a temperature group 2, a temperature group 3 and a temperature group 4 under a protection parameter menu. The protection trip logic takes a 'three to one' approach. 4 groups of temperature sensors, wherein the temperature of one sensor in any one group reaches a set value and is delayed to carry out the device action. The 13 temperature protection action can be set by the control word "temperature group outlet", and can be selected to trip or only signal. And alarming when the control word is set to be 0, and tripping when the control word is set to be 1.
After the temperature mutation occurs, the device records the temperature value Ts after the mutation occurs, and after the locking time is up, the device updates the detected temperature value and compares the updated temperature value with the temperature value Ts after the mutation occurs. When the difference value between the two values is smaller than the set value of 'temperature sudden change fixed value', the device releases the temperature sudden change locking function. After the locking is released, when the temperature value exceeds the temperature protection set value, the device judges that the phase is over-temperature, and the outlet acts after time delay. The action is delayed by 10s, so that the misoperation is avoided.
Further, the arc protection logic circuit comprises an arc detection circuit ARCn, a current detection circuit ARCnIP and a zero sequence voltage detection circuit ARCnUP; the arc detection circuit ARCn and the current detection circuit ARCnIP are respectively connected with the input of an AND gate 11, the arc detection circuit ARCn and the detection circuit ARCnUP of the zero sequence voltage are respectively connected with the input of an AND gate 12, the arc detection circuit ARCn, the current detection circuit ARCnIP and the detection circuit ARCnUP of the zero sequence voltage are respectively connected with the input of an AND gate 13, the output of the AND gate 11, the output of the AND gate 12 and the output of the arc detection circuit ARCn are respectively connected with the input of an OR gate 10, the output of the OR gate 10 and the rated arc ARCnE are respectively connected with the input of an AND gate 14, the output of the AND gate 13 and the rated arc ARCnE are respectively connected with the input of an AND gate 15, and the output of the AND gate 14 is connected with the output of the AND gate 15.
In the scheme, the arc protection tripping modes comprise the following 4 types: 1) And (4) arc light. 2) Arc + current. 3) Arc light + zero sequence voltage. 4) Arc light + current + zero sequence voltage.
The AND gate 11 detects the abnormality of the arc light detection circuit ARCn and the current detection circuit ARCNIP,
the AND gate 12 detects the arc light detection circuit ARCn and the zero sequence voltage detection circuit ARCnUP are abnormal at the same time,
the AND gate 13 arc light detection circuit ARCn, the current detection circuit ARCNIP and the zero sequence voltage detection circuit ARCNUP are abnormal at the same time,
the or gate 10 outputs "1" when abnormality occurs in the first or second or arc detecting circuit ARCn,
and the stationary arc is connected to the and gates 14, 15 when 1) arc occurs. 2) Arc + current. 3) Arc light + zero sequence voltage. 4) Arc light + current + zero sequence voltage. When any one of the 4 anomalies occurs, the ARCn output "1" trips. Because above-mentioned technical scheme compares with prior art, this utility model discloses technical scheme for electric power industry possesses following beneficial effect at least:
1. the utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, 100 ~ 240V ac dc power input.
2. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, three-phase current monitoring.
3. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, 2 arc light point sensors insert.
4. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, can gather 3*4 way wireless temperature sensor signal.
5. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, trip logic can be set for
"Current", "arc light + current", "arc light + zero sequence voltage", "arc light + current
Six modes of + zero sequence voltage and 'temperature'.
6. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system, has 2 large capacity tripping operation output contacts, way to report an emergency and ask for help or increased vigilance the contact output.
7. The utility model discloses electric power industry is with online temperature monitoring and explosion-proof system has friendly human-computer interface, through LCD screen display.
8. The utility model discloses online temperature monitoring and explosion-proof system for electric power industry from taking RS485 communication port, supports MODBUS communication protocol, will gather the signal and judge and transmit the host computer, carries out online real-time supervision.
Drawings
The features, objects, and advantages of the present invention will become more apparent from the description taken in conjunction with the accompanying drawings, which are incorporated herein and constitute a system according to the present invention, illustrating embodiments consistent with the present invention and together with the description, serve to explain the principles of the present invention.
FIG. 1 is a system configuration diagram of the present invention;
FIG. 2 is a logic diagram of the over-current protection of the present invention;
FIG. 3 is a logic diagram of the overload protection of the present invention;
FIG. 4 is a logic diagram of the temperature protection of the present invention;
fig. 5 is a logic diagram of arc protection according to the present invention.
Detailed Description
The present invention will be described in detail with reference to preferred embodiments as examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art, but it will be understood by those skilled in the art that the following descriptions are provided for illustration and description of some preferred embodiments only and are not intended to limit the scope of the present invention as claimed in the power industry.
Hereinafter, embodiments for the power industry of the present invention will be described:
the utility model discloses an online temperature monitoring and explosion-proof system for the power industry, which is configured with a current protection unit, an arc light protection unit and a temperature protection unit;
in one embodiment, the current protection unit, the arc protection unit and the temperature protection unit are respectively electrically connected with the control module;
the current protection unit comprises an overcurrent logic protection circuit for judging whether the circuit current collected in real time is overcurrent or not and an overload protection logic circuit for judging whether the circuit load collected is overloaded or not;
the temperature protection unit comprises a temperature protection logic circuit which judges a temperature signal detected by the temperature sensor and prevents temperature sudden change and misoperation;
the arc protection unit comprises an arc protection logic circuit for collecting whether arc light appears;
the overcurrent logic protection circuit, the overload protection logic circuit, the temperature mutation locking logic circuit and the arc light protection logic circuit are respectively and electrically connected with the control module;
the control module is respectively and electrically connected with the relay, the LCD display screen and the RS485 communication port;
and the RS485 communication port is in wireless connection with an upper computer.
In the embodiment, when the current protection unit judges overcurrent or overload, the temperature protection unit judges overtemperature and the arc protection unit judges that abnormality occurs, a control signal '1' is output, the control chip controls the relay to act to cut off the electric brake, the LCD displays the abnormality and transmits an abnormality report to the upper computer through the RS485 communication port.
In one embodiment, the overcurrent logic protection circuit comprises a three-phase current detection circuit I-PNP electrically connected with an input of an OR gate 1, an output of the OR gate and a rated current PNE are respectively electrically connected with an input of an AND gate 2, an output of the AND gate 2 is connected with an action delay module PND with adjustable overcurrent, and an overcurrent protection action PN0 is output.
In the embodiment, after threshold currents are respectively set for Ia, ib and Ic, and PNP are compared, if the threshold currents are greater than the set currents, the three-phase current detection circuit is logic "1", the three-phase current detection circuit is electrically connected with an or gate input, any one of the three-phase current detection circuit is "1", the or gate output is "1", and Ia, ib and Ic all output "0" during normal operation.
The output of the OR gate and the rated current are respectively electrically connected with the input of the AND gate, the output of the AND gate is connected with the action delay module with adjustable overcurrent, when the output is 0, the alarm is given, and when the output is 1, the trip is carried out to control the output overcurrent protection action.
Wherein PNP and N represent three-phase currents of different circuits.
In one embodiment, the overload protection logic circuit comprises a three-phase current load detection circuit I-PP electrically connected with an input of an or gate 3, an output of the or gate 3 and a rated current PE are respectively electrically connected with an input of an and gate 4, an output of the and gate 4 is connected with an overcurrent adjustable action delay module PD, and an overload protection action P0 is output.
In the embodiment, after threshold current loads PP are respectively set for Ia, ib and Ic, the three-phase current load detection circuit is logic "1" if the threshold current loads PP are greater than the set current, the three-phase current detection circuit is electrically connected with the input of the or gate, any one of the three current detection circuits is "1", the output of the or gate is "1", and Ia, ib and Ic all output "0" during normal operation.
The output of the OR gate and the rated current are respectively electrically connected with the input of the AND gate, the output of the AND gate is connected with the action delay module with adjustable overcurrent, when the output is 0, the alarm is given, and when the output is 1, the trip is carried out to control the output overcurrent protection action.
In one embodiment, the temperature protection logic circuit Tn-Temp includes a three-phase upper temperature detection circuit electrically connected to an input of an or gate 5, an output of the or gate 5 and a rated temperature TempE are electrically connected to an input of an and gate 6, respectively, a three-phase upper abrupt temperature detection circuit TSn-TSP is electrically connected to an input of an or gate 7, an output of the or gate 7 and a rated abrupt temperature TSnE are electrically connected to an input of an and gate 8, respectively, an output of the and gate 8 is electrically connected to a delay 10s module and then outputs an abrupt temperature TS0, an output of the and gate 8 is electrically connected to an input of an nand gate 9, an output of the not gate 9 is electrically connected to an input of the and gate 6, an output of the and gate 6 is connected to a temperature-adjustable action delay module and outputs a temperature protection action Temp0.
In the described embodiment, the device can monitor 12 wireless temperature signals, for a total of 4 sets. Tn is T1, T2, T3, T4 respectively, and is customized by a user according to the installation position. The temperature protection function is realized by fixed values of a temperature group 1, a temperature group 2, a temperature group 3 and a temperature group 4 of the ' protection parameter ' menu ' out-of-limit ' protection function '. The protection trip logic takes a 'three to one' approach. 4 groups of temperature sensors, one sensor in any group of temperature sensors reaches a set value, and the device acts after time delay. The 13 temperature protection action can be set by the control word "temperature group outlet", and can be selected to trip or only signal. And alarming when the control word is set to be 0, and tripping when the control word is set to be 1.
After the temperature mutation occurs, the device records the temperature value Ts after the mutation occurs, and after the locking time is up, the device updates the detected temperature value and compares the updated temperature value with the temperature value Ts after the mutation occurs. When the difference value of the two values is smaller than the set value of the 'temperature sudden change fixed value', the device releases the temperature sudden change locking function. After the locking is released, when the temperature value exceeds the temperature protection set value, the device judges that the phase is over-temperature, and the outlet acts after time delay. The action is delayed by 10s, so that the misoperation is avoided.
In one embodiment, the arc protection logic circuit includes an arc detection circuit ARCn, a current detection circuit ARCnUP, and a zero sequence voltage detection circuit ARCnUP; the arc detection circuit ARCn and the current detection circuit ARCnIP are respectively connected with the input of an AND gate 11, the arc detection circuit ARCn and the detection circuit ARCnUP of the zero sequence voltage are respectively connected with the input of an AND gate 12, the arc detection circuit ARCn, the current detection circuit ARCnIP and the detection circuit ARCnUP of the zero sequence voltage are respectively connected with the input of an AND gate 13, the output of the AND gate 11, the output of the AND gate 12 and the output of the arc detection circuit ARCn are respectively connected with the input of an OR gate 10, the output of the OR gate 10 and the rated arc ARCnE are respectively connected with the input of an AND gate 14, the output of the AND gate 13 and the rated arc ARCnE are respectively connected with the input of an AND gate 15, and the output of the AND gate 14 is connected with the output of the AND gate 15.
In the embodiment, the arc protection tripping modes comprise the following 4 modes: 1) And (4) arc light. 2) Arc + current. 3) Arc light + zero sequence voltage. 4) Arc light + current + zero sequence voltage.
The AND gate 11 detects the abnormality of the arc light detection circuit ARCn and the current detection circuit ARCNIP,
the AND gate 12 detects the arc light detection circuit ARCn and the zero sequence voltage detection circuit ARCnUP are abnormal at the same time,
the AND gate 13 arc light detection circuit ARCn, the current detection circuit ARCNIP and the zero sequence voltage detection circuit ARCNUP are abnormal at the same time,
the or gate 10 outputs "1" when abnormality occurs in the first or second or arc detecting circuit ARCn,
and the stationary arc is connected to the and gates 14, 15 when 1) arc occurs. 2) Arc + current. 3) Arc light + zero sequence voltage. 4) Arc light + current + zero sequence voltage. When any one of the 4 abnormalities occurs, the ARCn output "1" trips.
The present invention is described in detail with reference to the attached drawings, in which the present invention is an embodiment of an online temperature monitoring and explosion-proof system for power industry. However, those skilled in the art will understand that the foregoing is illustrative and describes only some embodiments, and that the scope of the present invention for use in the power industry, and particularly the scope of the appended claims, is not intended to be limiting in any way.
Claims (5)
1. An online temperature monitoring and explosion-proof system for the power industry is characterized by being configured with a current protection unit, an arc light protection unit and a temperature protection unit;
the current protection unit, the arc light protection unit and the temperature protection unit are respectively electrically connected with the control module;
the current protection unit comprises an overcurrent logic protection circuit for judging whether the circuit current collected in real time is overcurrent or not and an overload protection logic circuit for judging whether the circuit load collected is overloaded or not;
the temperature protection unit comprises a temperature protection logic circuit which judges a temperature signal detected by the temperature sensor and prevents temperature sudden change maloperation;
the arc protection unit comprises an arc protection logic circuit for collecting whether arc light appears or not;
the overcurrent logic protection circuit, the overload protection logic circuit, the temperature mutation locking logic circuit and the arc light protection logic circuit are respectively and electrically connected with the control module;
the control module is respectively and electrically connected with the relay, the LCD display screen and the RS485 communication port;
and the RS485 communication port is in wireless connection with an upper computer.
2. The on-line temperature monitoring and explosion-proof system for the power industry as claimed in claim 1, wherein the over-current logic protection circuit comprises a three-phase current detection circuit I-PNP electrically connected to an input of an or gate 1, an output of the or gate and a rated current PNE are respectively electrically connected to an input of an and gate 2, an output of the and gate 2 is connected to an over-current adjustable action delay module PND, and an over-current protection action PN0 is output.
3. The on-line temperature monitoring and explosion-proof system for the power industry as claimed in claim 1, wherein the overload protection logic circuit comprises a three-phase current load detection circuit I-PP electrically connected with an input of an or gate 3, an output of the or gate 3 and a rated current PE are respectively electrically connected with an input of an and gate 4, an output of the and gate 4 is connected with an action delay module PD with adjustable overcurrent, and outputs an overload protection action P0.
4. The on-line temperature monitoring and explosion-proof system for the power industry as claimed in claim 1, wherein the temperature protection logic circuit Tn-Temp comprises a three-phase upper temperature detection circuit electrically connected with an input of an or gate 5, an output of the or gate 5 and a rated temperature TempE are respectively electrically connected with an input of an and gate 6, a three-phase upper sudden change temperature detection circuit TSn-TSP is electrically connected with an input of an or gate 7, an output of the or gate 7 and a rated sudden change temperature TSnE are respectively electrically connected with an input of an and gate 8, an output of the and gate 8 is electrically connected with a delay 10s module and then outputs a sudden change temperature TS0, an output of the and gate 8 is electrically connected with an input of an and gate 9, an output of the not gate 9 is electrically connected with an input of the and gate 6, an output of the and gate 6 is connected with a temperature adjustable action delay module and outputs a temperature protection action Temp0.
5. The on-line temperature monitoring and explosion-proof system for power industry of claim 1, wherein the arc protection logic circuit comprises an arc detection circuit ARCn, a current detection circuit ARCnUP and a zero-sequence voltage detection circuit ARCnUP; the arc detection circuit ARCn and the current detection circuit ARCNIP are respectively connected with the input of an AND gate 11, the arc detection circuit ARCn and the detection circuit ARCNUP of the zero sequence voltage are respectively connected with the input of an AND gate 12, the arc detection circuit ARCn, the current detection circuit ARCNIP and the detection circuit ARCNUP of the zero sequence voltage are respectively connected with the input of an AND gate 13, the output of the AND gate 11, the output of the AND gate 12 and the arc detection circuit ARCN are respectively connected with the input of an OR gate 10, the output of the OR gate 10 and the rated arc ARCNEs are respectively connected with the input of an AND gate 14, the output of the AND gate 13 and the rated arc ARCNEs are respectively connected with the input of an AND gate 15, and the output of the AND gate 14 is connected with the output of the AND gate 15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221022561.8U CN217590373U (en) | 2022-04-29 | 2022-04-29 | Online temperature monitoring and explosion-proof system for power industry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221022561.8U CN217590373U (en) | 2022-04-29 | 2022-04-29 | Online temperature monitoring and explosion-proof system for power industry |
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| CN217590373U true CN217590373U (en) | 2022-10-14 |
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| CN202221022561.8U Active CN217590373U (en) | 2022-04-29 | 2022-04-29 | Online temperature monitoring and explosion-proof system for power industry |
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