CN112952788A - Monitoring method and power protection system - Google Patents

Monitoring method and power protection system Download PDF

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Publication number
CN112952788A
CN112952788A CN202110293966.9A CN202110293966A CN112952788A CN 112952788 A CN112952788 A CN 112952788A CN 202110293966 A CN202110293966 A CN 202110293966A CN 112952788 A CN112952788 A CN 112952788A
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resistor
protection
capacitor
temperature rise
lightning
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CN112952788B (en
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赵军
刘细华
李希
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Xiamen Set Electronics Co Ltd
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Xiamen Set Electronics Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass

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  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention relates to the technical field of power protection, in particular to a monitoring method and a power protection system.

Description

Monitoring method and power protection system
Technical Field
The invention relates to the technical field of power protection, in particular to a monitoring method and a power protection system.
Background
The existing power protection usually adopts circuit safety protection elements such as a surge protector and a fuse, and has poor systematicness and single function.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a monitoring method and a power protection system are provided to perform lightning protection and electromagnetic protection on a power system and realize intelligent management.
In order to solve the above technical problems, a first technical solution adopted by the present invention is:
a monitoring method comprising the steps of:
s1, acquiring the working states of the protection system and the safety protection component; the working state comprises a temperature rise value of the protection system, lightning times of the protection system, a temperature rise value of the safety protection component and lightning times of the safety protection component;
s2, according to the working states of the protection system and the safety protection component collected in the step S1, working time corresponding to the protection system and the safety protection component is counted;
s3, judging whether the working time lengths are all smaller than a preset reference time length;
and S4, if yes, alarming according to the temperature rise value of the protection system, the lightning frequency of the protection system, the temperature rise value of the safety protection component and the lightning frequency of the safety protection component.
The second technical scheme adopted by the invention is as follows:
the utility model provides a power protection system, includes NEMP guard unit, first LEMP guard unit, second LEMP guard unit, parameter monitoring unit and TEC guard unit, NEMP guard unit is connected with first LEMP guard unit, second LEMP guard unit, parameter monitoring unit and TEC guard unit electricity respectively, first LEMP guard unit is connected with second LEMP guard unit, parameter monitoring unit and TEC guard unit electricity respectively.
The invention has the beneficial effects that:
through the operating condition of gathering protection system and safety protection components and parts, according to the operating condition of protection system and safety protection components and parts that gather, make statistics of the operating duration that protection system and safety protection components and parts correspond, judge again whether operating duration all is less than predetermined reference duration, if be less than predetermined reference duration, then report to the police according to protection system's temperature rise value, protection system's thunder and lightning number of times, safety protection components and parts's temperature rise value and safety protection components and parts' thunder and lightning number of times, so not only can reach monitoring effect, can simplify the monitoring flow again, save monitoring cost, reduce the analysis operand, promote the efficiency of control.
Drawings
FIG. 1 is a flow chart of the steps of a monitoring method according to the present invention;
FIG. 2 is a connection block diagram of a power protection system according to the present invention;
fig. 3 is a schematic circuit diagram of a NEMP protection unit, a first LEMP protection unit and a second LEMP protection unit of a power protection system according to the present invention;
description of reference numerals:
1. a NEMP guard unit; 2. a first LEMP protection unit; 3. a second LEMP protection unit; 4. a parameter monitoring unit; 5. and a TEC protection unit.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a technical solution provided by the present invention:
a monitoring method comprising the steps of:
s1, acquiring the working states of the protection system and the safety protection component; the working state comprises a temperature rise value of the protection system, lightning times of the protection system, a temperature rise value of the safety protection component and lightning times of the safety protection component;
s2, according to the working states of the protection system and the safety protection component collected in the step S1, working time corresponding to the protection system and the safety protection component is counted;
s3, judging whether the working time lengths are all smaller than a preset reference time length;
and S4, if yes, alarming according to the temperature rise value of the protection system, the lightning frequency of the protection system, the temperature rise value of the safety protection component and the lightning frequency of the safety protection component.
From the above description, the beneficial effects of the present invention are:
through the operating condition of gathering protection system and safety protection components and parts, according to the operating condition of protection system and safety protection components and parts that gather, make statistics of the operating duration that protection system and safety protection components and parts correspond, judge again whether operating duration all is less than predetermined reference duration, if be less than predetermined reference duration, then report to the police according to protection system's temperature rise value, protection system's thunder and lightning number of times, safety protection components and parts's temperature rise value and safety protection components and parts' thunder and lightning number of times, so not only can reach monitoring effect, can simplify the monitoring flow again, save monitoring cost, reduce the analysis operand, promote the efficiency of control.
Further, step S4 is specifically:
if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is larger than a first preset temperature rise value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a second preset temperature rise value or not;
if so, carrying out second early warning, starting to record the temperature rise time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the temperature rise time of the protection system and the safety protection component is longer than the preset temperature rise time;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a third preset temperature rise value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset temperature rise value and the second preset temperature rise value are both smaller than a third preset temperature rise value, and the second preset temperature rise value is larger than the first preset temperature rise value.
According to the above description, a three-level early warning mode is adopted, and different early warnings are triggered according to temperature rises of different degrees, so that safe and effective monitoring is realized. The specific early warning mode is not limited to three levels, for example, four-time early warning can be performed, three-time early warning is preferably performed in the scheme, and effective early warning and operation efficiency are both considered.
Further, step S4 is specifically: if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the lightning times of the protection system and the lightning times of the safety protection component is larger than a first preset lightning value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the lightning frequency of the protection system and the lightning frequency of the safety protection component is greater than a second preset lightning value or not;
if yes, carrying out second early warning, starting to record the lightning generation time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the lightning generation time of the protection system and the safety protection component is longer than the preset lightning generation time;
judging whether the lightning frequency of the difference between the lightning frequency of the protection system and the temperature rise value of the safety protection component is greater than a third preset lightning value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset lightning value and the second preset lightning value are both smaller than a third preset lightning value, and the second preset lightning value is larger than the first preset lightning value.
According to the above description, a three-stage early warning mode is adopted, and different early warnings are triggered according to different lightning times, so that safe and effective monitoring is realized. The specific early warning mode is not limited to three levels, for example, four-time early warning can be performed, three-time early warning is preferably performed in the scheme, and effective early warning and operation efficiency are both considered.
Further, step S4 further includes the following steps: and if the working time lengths corresponding to the protection system and the safety protection component are less than the preset reference time length, monitoring the failure condition of the TEC unit, and alarming according to the failure condition of the TEC unit.
Furthermore, the early warning processing priority of the protection system and the safety protection component is that the temperature rise condition is greater than the lightning frequency.
Referring to fig. 2, another technical solution provided by the present invention:
the utility model provides a power protection system, includes NEMP guard unit, first LEMP guard unit, second LEMP guard unit, parameter monitoring unit and TEC guard unit, NEMP guard unit is connected with first LEMP guard unit, second LEMP guard unit, parameter monitoring unit and TEC guard unit electricity respectively, first LEMP guard unit is connected with second LEMP guard unit, parameter monitoring unit and TEC guard unit electricity respectively.
From the above description, the beneficial effects of the present invention are:
the NEMP protection unit is arranged to realize high-performance filtering, and the high-reliability anti-human electromagnetic pulse attack and nuclear electromagnetic pulse attack function is realized; the first LEMP protection unit and the second LEMP protection unit are arranged, so that the power supply protection system has a high-reliability function of resisting natural lightning electromagnetic pulse attack; the TEC protection unit is arranged and bridged between the two groups of grounding bodies of the lightning protection ground and the logic ground, the TEC protection unit is in a high-resistance state in a normal state, and only when the two groups of grounding bodies generate high potential difference due to electromagnetic pulse attack, the TEC protection unit acts to short-circuit the two groups of grounding bodies in a transient state, so that the ground potential counterattack is avoided; the method comprises the steps that a parameter monitoring unit is arranged, working signals of all protection units can be input into the parameter monitoring unit, the parameter monitoring unit processes the input signals, the situations of overvoltage, undervoltage, overcurrent, overheating and the like of a power supply protection system are monitored, components are protected when abnormality occurs, and local sound, light, electricity and the like are alarmed; the scheme performs lightning protection and electromagnetic protection on the power supply system through the cooperation among the NEMP protection unit, the first LEMP protection unit, the second LEMP protection unit, the parameter monitoring unit and the TEC protection unit, and realizes intelligent management.
Further, first LEMP protection unit includes resistance RV1, resistance RV2 and resistance RV3, resistance RV 3's one end respectively with resistance RV 1's one end and NEMP protection unit electricity be connected, resistance RV 3's the other end is connected with resistance RV 2's one end electricity and resistance RV 3's the other end and resistance RV 2's one end all ground, resistance RV 2's the other end respectively with resistance RV 1's the other end and NEMP protection unit electricity be connected.
Further, the second LEMP protection unit includes resistance RV4, resistance RV5 and resistance RV6, the one end of resistance RV4 is connected with resistance RV 6's one end and NEMP protection unit electricity respectively, resistance RV 4's the other end is connected with resistance RV 5's one end electricity and resistance RV 4's the other end and resistance RV 5's one end all ground, resistance RV 5's the other end is connected with resistance RV 6's the other end and NEMP protection unit electricity respectively.
Further, the resistor RV1, the resistor RV2, the resistor RV3, the resistor RV4, the resistor RV5 and the resistor RV6 are all piezoresistors.
As can be seen from the above description, the common mode of the resistor RV1 and the resistor RV2 and the resistor RV3 discharges the lightning electromagnetic pulse at the power inlet end to the ground, so that the high voltage generated by the lightning electromagnetic pulse is limited to be less than the rated value of the protected power system, and the all-round protection is realized at the power inlet end.
Because the lightning electromagnetic pulse is transmitted in a long line in the NEMP protection unit to generate a long line oscillation effect, the second LEMP protection unit eliminates overvoltage and pulse current generated by the long line oscillation effect through a resistor RV6 differential mode, a resistor RV4 and a resistor RV5 common mode.
Further, NEMP protection unit includes resistance R, electric capacity CX, electric capacity CY, inductance L and inductance L, electric capacity CY's one end is connected with resistance R's one end, electric capacity CX's one end and inductance L's one end electricity respectively, inductance L's the other end is connected with electric capacity CX's one end, electric capacity CY's one end and second LEMP protection unit electricity respectively, electric capacity CY's the other end is connected with electric capacity CY's one end electricity and the other end of electric capacity CY all ground connection, electric capacity CY's the other end is connected with electric capacity CX's the other end, inductance L's one end and second LEMP protection unit electricity respectively, inductance L's the other, The other end of electric capacity CX2 and one end of inductance L2 are connected electrically, the other end of inductance L2 is connected with the other end of electric capacity CX1, the other end of resistance R1, the one end and the first LEMP protection unit electricity of electric capacity CY2 respectively, the other end of electric capacity CY1 is connected electrically and the other end of electric capacity CY2 is all grounded with the other end of electric capacity CY1 and the other end of electric capacity CY2, the other end of electric capacity CY3 is connected electrically and the other end of electric capacity CY4 is also all grounded with the other end of electric capacity CY3 and the other end of electric capacity CY 4.
As can be seen from the above description, the artificial electromagnetic pulse and the nuclear electromagnetic pulse cannot be protected by the first LEMP unit with a slow response time (μ s level) due to the short wave head time (ns level), and therefore the NEMP protection unit employs two pi-type filters, which can eliminate the artificial electromagnetic pulse and the nuclear electromagnetic pulse.
Referring to fig. 1, a first embodiment of the present invention is:
a monitoring method comprising the steps of:
s1, acquiring the working states of the protection system and the safety protection component; the working state comprises a temperature rise value of the protection system, lightning times of the protection system, a temperature rise value of the safety protection component and lightning times of the safety protection component;
s2, according to the working states of the protection system and the safety protection component collected in the step S1, working time corresponding to the protection system and the safety protection component is counted;
s3, judging whether the working time lengths are all smaller than a preset reference time length;
and S4, if yes, alarming according to the temperature rise value of the protection system, the lightning frequency of the protection system, the temperature rise value of the safety protection component and the lightning frequency of the safety protection component.
Step S4 specifically includes:
if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is larger than a first preset temperature rise value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a second preset temperature rise value or not;
if so, carrying out second early warning, starting to record the temperature rise time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the temperature rise time of the protection system and the safety protection component is longer than the preset temperature rise time;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a third preset temperature rise value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset temperature rise value and the second preset temperature rise value are both smaller than a third preset temperature rise value, and the second preset temperature rise value is larger than the first preset temperature rise value.
Step S4 specifically includes: if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the lightning times of the protection system and the lightning times of the safety protection component is larger than a first preset lightning value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the lightning frequency of the protection system and the lightning frequency of the safety protection component is greater than a second preset lightning value or not;
if yes, carrying out second early warning, starting to record the lightning generation time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the lightning generation time of the protection system and the safety protection component is longer than the preset lightning generation time;
judging whether the lightning frequency of the difference between the lightning frequency of the protection system and the temperature rise value of the safety protection component is greater than a third preset lightning value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset lightning value and the second preset lightning value are both smaller than a third preset lightning value, and the second preset lightning value is larger than the first preset lightning value.
Step S4 further includes the steps of: and if the working time lengths corresponding to the protection system and the safety protection component are less than the preset reference time length, monitoring the failure condition of the TEC unit, and alarming according to the failure condition of the TEC unit.
The early warning processing priority of the protection system and the safety protection component is that the temperature rise condition is greater than the lightning frequency.
The specific embodiment of the monitoring method is as follows:
and S1, establishing a data management platform, wherein the platform can transmit data to the central control system through a local area network, a wide area network or a wireless network transmission mode. Different power protection systems are preset to correspond to different early warning precisions.
S2, analyzing the early warning accuracy corresponding to the protected power supply system;
s3, acquiring the working states of the protection system and each safety protection component in real time, wherein the temperature rise value T1 (fuse, piezoresistor, thermistor and the like), the lightning frequency n1(SPD) of each safety protection component, the temperature rise value T2(NEMP protection unit) of the protection system and the lightning frequency n2(LEMP protection unit) of the protection system are obtained. When the TEC protection unit exists, whether the TEC protection unit is invalid or not is monitored in real time, the action times of the TEC protection unit are recorded, and a user can know the action times of the TEC protection unit in real time.
S4, counting the corresponding working time t according to the working states of the protection system and each safety protection component, comparing the working time t of the protection system or each safety protection component with the corresponding preset reference time t0, and carrying out sound/light/electric alarm if t > is t 0; t0 is obtained from the life curves of each safety protection component and the protection system itself.
And S5, if t is less than t0, giving an alarm with corresponding precision according to the temperature rise value, the lightning frequency and the failure condition of the TEC protection unit.
Assuming that the early warning accuracy of the protected power system is three levels, the method may specifically be as follows:
calculating an absolute difference value between T1 and T2 to obtain delta T, and if the delta T > is equal to a preset value T01, performing first early warning; if the delta T > is T02, carrying out the second early warning, starting to record the duration, and informing the user to replace the device when the duration reaches the preset value; and if the delta T > is T03, carrying out a third early warning, and immediately informing the user of replacing the device. Wherein T01< T02< T03; t01, T02, T03 are obtained according to the device degradation degree, specifically: and obtaining the parameters according to the basic parameter values in the service life curve of the device and the parameter values corresponding to the catastrophe points of the temperature rise in the experiment.
Calculating an absolute difference value between n1 and n2 to obtain delta n, and if delta n > is equal to a preset value n01, performing first early warning; if the delta n > is n02, carrying out the second early warning, starting to record the duration, and informing the user to replace the device when the duration reaches the preset value; and if the delta n > is equal to n03, carrying out third early warning and immediately informing the user of replacing the device. Wherein n01< n02< n 03. The third early warning is an early warning mode with better precision, and can also be a first early warning, a second early warning, a fourth early warning and the like.
And when the TEC protection unit is monitored to be out of work, alarming.
Specifically, the current and voltage values can be collected in real time, and early warning can be performed according to the change of the current and the voltage. Because the current and voltage changes can be reflected by the temperature rise value, the scheme preferably selects the mode of collecting the temperature rise value, not only can achieve the monitoring effect, but also can simplify the monitoring process, save the monitoring cost, reduce the analysis operand and improve the monitoring efficiency.
The preset values can be pre-configured in the system or manually set by a user before use.
Referring to fig. 2 and fig. 3, a second embodiment of the present invention is:
referring to fig. 2, a power protection system includes a NEMP protection unit 1 (i.e., a nuclear electromagnetic pulse protection unit), a first LEMP protection unit 2 (i.e., a first lightning strike electromagnetic pulse protection unit), a second LEMP protection unit 3 (i.e., a second lightning strike electromagnetic pulse protection unit), a parameter monitoring unit 4, and a TEC protection unit 5 (i.e., a transient short circuit connector protection unit), where the NEMP protection unit 1 is electrically connected to the first LEMP protection unit 2, the second LEMP protection unit 3, the parameter monitoring unit 4, and the TEC protection unit 5, respectively, and the first LEMP protection unit 2 is electrically connected to the second LEMP protection unit 3, the parameter monitoring unit 4, and the TEC protection unit 5, respectively.
The NEMP protection unit 1 can comprise a BLPF (Butterworth filter) and the like, high-performance filtering is realized, and the functions of resisting human electromagnetic pulse attacks and nuclear electromagnetic pulse attacks generated by human bodies with high reliability are achieved.
The first LEMP protection unit 2 and the second LEMP protection unit 3 have the same structure, may include an SPD (surge protector) and an SSD (special Disconnector SPD for protection after SPD), and have a highly reliable function of resisting natural lightning electromagnetic pulse attack.
The parameter monitoring unit 4 can adopt a processor and a TEC device in the prior art, as long as the device can realize the parameter monitoring function.
The TEC protection unit 5 is bridged between the two groups of grounding bodies of the lightning protection ground and the logic ground, the TEC protection unit 5 is in a high-resistance state in a normal state, and only when the two groups of grounding bodies generate high potential difference due to electromagnetic pulse attack, the TEC protection unit 5 acts to short-circuit the two groups of grounding bodies in a transient state, so that ground potential counterattack is avoided.
Referring to fig. 3, the first LEMP protection unit 2 includes a resistor RV1 (with a resistance value of 5 Ω -5k Ω), a resistor RV2 (with a resistance value of 5 Ω -5k Ω), and a resistor RV3 (with a resistance value of 5 Ω -5k Ω), one end of the resistor RV3 is electrically connected to one end of the resistor RV1 and the NEMP protection unit 1, the other end of the resistor RV3 is electrically connected to one end of the resistor RV2, the other end of the resistor RV3 and one end of the resistor RV2 are both grounded, and the other end of the resistor RV2 is electrically connected to the other end of the resistor RV1 and the NEMP protection unit 1.
The resistor RV1, the resistor RV2 and the resistor RV3 are all piezoresistors.
Referring to fig. 3, the second LEMP protection unit 3 includes a resistor RV4 (with a resistance value of 5 Ω -5k Ω), a resistor RV5 (with a resistance value of 5 Ω -5k Ω), and a resistor RV6 (with a resistance value of 5 Ω -5k Ω), one end of the resistor RV4 is electrically connected to one end of the resistor RV6 and the NEMP protection unit 1, the other end of the resistor RV4 is electrically connected to one end of the resistor RV5, the other end of the resistor RV4 and one end of the resistor RV5 are both grounded, and the other end of the resistor RV5 is electrically connected to the other end of the resistor RV6 and the NEMP protection unit 1.
The resistor RV4, the resistor RV5 and the resistor RV6 are all piezoresistors.
Referring to fig. 3, the NEMP protection unit 1 includes a resistor R1, a capacitor CX1, a capacitor CX2, a capacitor CX3, a capacitor CY3, an inductor L3, and an inductor L3, wherein one end of the capacitor CY3 is electrically connected to one end of the resistor R3, one end of the capacitor CX3, and one end of the inductor L3, the other end of the inductor L3 is electrically connected to one end of the capacitor CX3, one end of the capacitor CY3, and one end of the inductor L3, the other end of the inductor L3 is electrically connected to one end of the capacitor CY3, and the second LEMP protection unit 3, the other end of the capacitor CY3 is electrically connected to one end of the capacitor CY3, the other end of the capacitor CY3 and one end of the capacitor CY3 are electrically connected to ground, the second end of the capacitor CY3 and the capacitor CY3, the other end of inductance L2 is connected with the one end of electric capacity CY4, the other end of electric capacity CX2 and the one end of inductance L2 electricity respectively, the other end of inductance L2 is connected with the other end of electric capacity CX1, the other end of resistance R1, the one end and the first LEMP protection unit 2 electricity of electric capacity CY2 respectively, the other end of electric capacity CY1 is connected with the other end electricity of electric capacity CY2 and the other end of electric capacity CY1 and the other end of electric capacity CY2 all ground connection, the other end of electric capacity CY3 is connected with the other end electricity of electric capacity CY4 and the other end of electric capacity CY3 and the other end of electric capacity CY4 all ground connection.
The input end of the NEMP protection unit 1 is connected with 220V alternating current.
The power protection system also comprises a safety protection component (such as a fuse, a temperature fuse, a negative temperature coefficient thermistor (NTC) and the like) arranged on the power system circuit.
Working signals of all protection units and safety protection components are input to the parameter monitoring unit 4, the parameter monitoring unit 4 processes the input signals, the situations of overvoltage, undervoltage, overcurrent, overheating and the like of the power protection system are monitored, and when an abnormality occurs, the components are protected, and local sound, light, electricity and the like are given out. The system can also inform the central control system in a wired or wireless way.
NEMP protection unit 1, first LEMP protection unit 2 and second LEMP protection unit 3 constitute the electromagnetic protection unit, adopt two-stage differential mode, common mode design, when first-order protection (being first LEMP protection unit 2) mainly invades to power supply entry end thunder and lightning electromagnetic pulse, discharge its impulse current transient state to ground, make thunder and lightning electromagnetic pulse produce the high voltage and restrict to being less than the rated value Uw of being protected electrical power generating system, realize all-round protection at power supply entry end. The NEMP including the artificial electromagnetic pulse and the nuclear electromagnetic pulse has a short wave head time (ns level), and the first LEMP protection unit 2 for lightning electromagnetic pulse protection has a slow response time (μ s level), so that the NEMP is not protected, and therefore, the NEMP protection unit 1 adopts two pi-type filters to eliminate invasion of the NEMP. The lightning electromagnetic pulse is transmitted in a long line in the NEMP protection unit 1 to generate a long line oscillation effect, and further the overvoltage and the pulse current generated by the long line oscillation effect are eliminated through the second-stage protection (the second LEMP protection unit 3).
In summary, according to the monitoring method and the power protection system provided by the invention, the working states of the protection system and the safety protection component are collected, the working durations corresponding to the protection system and the safety protection component are counted according to the collected working states of the protection system and the safety protection component, whether the working durations are all smaller than the preset reference duration is judged, and if the working durations are smaller than the preset reference duration, an alarm is given according to the temperature rise value of the protection system, the lightning frequency of the protection system, the temperature rise value of the safety protection component and the lightning frequency of the safety protection component, so that the monitoring effect can be achieved, the monitoring process can be simplified, the monitoring cost can be saved, the analysis operand can be reduced, and the monitoring efficiency can be improved. The NEMP protection unit is arranged to realize high-performance filtering, and the high-reliability anti-human electromagnetic pulse attack and nuclear electromagnetic pulse attack function is realized; the first LEMP protection unit and the second LEMP protection unit are arranged, so that the power supply protection system has a high-reliability function of resisting natural lightning electromagnetic pulse attack; the TEC protection unit is arranged and bridged between the two groups of grounding bodies of the lightning protection ground and the logic ground, the TEC protection unit is in a high-resistance state in a normal state, and only when the two groups of grounding bodies generate high potential difference due to electromagnetic pulse attack, the TEC protection unit acts to short-circuit the two groups of grounding bodies in a transient state, so that the ground potential counterattack is avoided; the method comprises the steps that a parameter monitoring unit is arranged, working signals of all protection units can be input into the parameter monitoring unit, the parameter monitoring unit processes the input signals, the situations of overvoltage, undervoltage, overcurrent, overheating and the like of a power supply protection system are monitored, components are protected when abnormality occurs, and local sound, light, electricity and the like are alarmed; the scheme performs lightning protection and electromagnetic protection on the power supply system through the cooperation among the NEMP protection unit, the first LEMP protection unit, the second LEMP protection unit, the parameter monitoring unit and the TEC protection unit, and realizes intelligent management.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims (10)

1. A monitoring method, comprising the steps of:
s1, acquiring the working states of the protection system and the safety protection component; the working state comprises a temperature rise value of the protection system, lightning times of the protection system, a temperature rise value of the safety protection component and lightning times of the safety protection component;
s2, according to the working states of the protection system and the safety protection component collected in the step S1, working time corresponding to the protection system and the safety protection component is counted;
s3, judging whether the working time lengths are all smaller than a preset reference time length;
and S4, if yes, alarming according to the temperature rise value of the protection system, the lightning frequency of the protection system, the temperature rise value of the safety protection component and the lightning frequency of the safety protection component.
2. The monitoring method according to claim 1, wherein the step S4 is specifically:
if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is larger than a first preset temperature rise value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a second preset temperature rise value or not;
if so, carrying out second early warning, starting to record the temperature rise time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the temperature rise time of the protection system and the safety protection component is longer than the preset temperature rise time;
judging whether the absolute value of the difference between the temperature rise value of the protection system and the temperature rise value of the safety protection component is greater than a third preset temperature rise value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset temperature rise value and the second preset temperature rise value are both smaller than a third preset temperature rise value, and the second preset temperature rise value is larger than the first preset temperature rise value.
3. The monitoring method according to claim 1, wherein the step S4 is specifically: if the working time lengths corresponding to the protection system and the safety protection component are both smaller than a preset reference time length, judging whether the absolute value of the difference between the lightning times of the protection system and the lightning times of the safety protection component is larger than a first preset lightning value or not;
if yes, performing first early warning;
judging whether the absolute value of the difference between the lightning frequency of the protection system and the lightning frequency of the safety protection component is greater than a second preset lightning value or not;
if yes, carrying out second early warning, starting to record the lightning generation time of the protection system and the safety protection component, and controlling to send out an alarm for replacing the device when the lightning generation time of the protection system and the safety protection component is longer than the preset lightning generation time;
judging whether the lightning frequency of the difference between the lightning frequency of the protection system and the temperature rise value of the safety protection component is greater than a third preset lightning value or not;
if yes, carrying out third early warning and controlling to send out an alarm for replacing the device; the first preset lightning value and the second preset lightning value are both smaller than a third preset lightning value, and the second preset lightning value is larger than the first preset lightning value.
4. The monitoring method according to claim 1, wherein the step S4 further comprises the steps of: and if the working time lengths corresponding to the protection system and the safety protection component are less than the preset reference time length, monitoring the failure condition of the TEC unit, and alarming according to the failure condition of the TEC unit.
5. The monitoring method according to claim 1, wherein the early warning processing priority of the protection system and the safety protection component is that the temperature rise condition is greater than the lightning frequency.
6. The power supply protection system is characterized by comprising a NEMP protection unit, a first LEMP protection unit, a second LEMP protection unit, a parameter monitoring unit and a TEC protection unit, wherein the NEMP protection unit is electrically connected with the first LEMP protection unit, the second LEMP protection unit, the parameter monitoring unit and the TEC protection unit respectively, and the first LEMP protection unit is electrically connected with the second LEMP protection unit, the parameter monitoring unit and the TEC protection unit respectively.
7. The power supply protection system according to claim 6, wherein the first LEMP protection unit comprises a resistor RV1, a resistor RV2 and a resistor RV3, one end of the resistor RV3 is electrically connected with one end of the resistor RV1 and the NEMP protection unit respectively, the other end of the resistor RV3 is electrically connected with one end of a resistor RV2, the other end of the resistor RV3 and one end of the resistor RV2 are both grounded, and the other end of the resistor RV2 is electrically connected with the other end of the resistor RV1 and the NEMP protection unit respectively.
8. The power supply protection system according to claim 7, wherein the second LEMP protection unit comprises a resistor RV4, a resistor RV5 and a resistor RV6, one end of the resistor RV4 is electrically connected with one end of the resistor RV6 and the NEMP protection unit respectively, the other end of the resistor RV4 is electrically connected with one end of a resistor RV5, the other end of the resistor RV4 and one end of the resistor RV5 are both grounded, and the other end of the resistor RV5 is electrically connected with the other end of the resistor RV6 and the NEMP protection unit respectively.
9. The power supply protection system according to claim 8, wherein the resistor RV1, the resistor RV2, the resistor RV3, the resistor RV4, the resistor RV5 and the resistor RV6 are all piezoresistors.
10. The power supply protection system according to claim 6, wherein the NEMP protection unit comprises a resistor R1, a capacitor CX1, a capacitor CX2, a capacitor CX3, a capacitor CY3, an inductor L3 and an inductor L3, one end of the capacitor CY3 is electrically connected with one end of the resistor R3, one end of the capacitor CX3 and one end of the inductor L3 respectively, the other end of the inductor L3 is electrically connected with one end of the capacitor CX3, one end of the capacitor CY3 and one end of the inductor L3 respectively, the other end of the capacitor CY3 is electrically connected with the second LEMP protection unit, the other end of the capacitor CY3 is electrically connected with one end of the capacitor CY3 and the other end of the capacitor CY3 are electrically connected with the first end of the capacitor CY3, the capacitor CY3 and the other end of the capacitor CY3 are electrically connected with the first end of the capacitor CY3 and the capacitor CY3, the other end of the inductor L2 is electrically connected with one end of a capacitor CY4, the other end of a capacitor CX2 and one end of an inductor L2, the other end of the inductor L2 is electrically connected with the other end of a capacitor CX1, the other end of a resistor R1, one end of a capacitor CY2 and the first LEMP protection unit, the other end of the capacitor CY1 is electrically connected with the other end of the capacitor CY2, the other end of the capacitor CY1 and the other end of the capacitor CY2 are grounded, the other end of the capacitor CY3 is electrically connected with the other end of the capacitor CY4, and the other end of the capacitor CY3 and the other end of the capacitor CY4 are grounded.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102904238A (en) * 2012-10-24 2013-01-30 深圳市雷博斯科技有限公司 Overheat, overcurrent and overvoltage lightning protector
CN206057461U (en) * 2016-09-09 2017-03-29 深圳市雷博斯科技有限公司 A kind of lightning monitoring and deterioration state monitoring system of lightning protection box
CN106849628A (en) * 2017-01-23 2017-06-13 中国人民解放军61489部队 A kind of high-power electromagnetic pulse protection module for power line
CN207150414U (en) * 2017-07-25 2018-03-27 四川国力科创科技有限公司 A kind of doubleway output filter power supply of anti-lightning strike anti-surge voltage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102904238A (en) * 2012-10-24 2013-01-30 深圳市雷博斯科技有限公司 Overheat, overcurrent and overvoltage lightning protector
CN206057461U (en) * 2016-09-09 2017-03-29 深圳市雷博斯科技有限公司 A kind of lightning monitoring and deterioration state monitoring system of lightning protection box
CN106849628A (en) * 2017-01-23 2017-06-13 中国人民解放军61489部队 A kind of high-power electromagnetic pulse protection module for power line
CN207150414U (en) * 2017-07-25 2018-03-27 四川国力科创科技有限公司 A kind of doubleway output filter power supply of anti-lightning strike anti-surge voltage

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