CN114646400A - Temperature sensor device based on optomagnetic combines power supply - Google Patents
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention provides a temperature sensor device based on optomagnetic combined power supply, which collects temperature data of each area in a switch cabinet, carries out accumulation processing on the temperature data of the corresponding area according to the temperature change trend, calculates a temperature predicted value based on the change trend, and generates alarm information when the temperature predicted value is greater than a temperature threshold value so as to remind corresponding workers to carry out processing in time. The device provided by the invention does not need to be checked regularly by an operator on duty, acquires and transmits temperature data in a wireless mode, and calculates a predicted temperature value by utilizing the temperature change trend, thereby realizing more accurate temperature early warning.
Description
Technical Field
The invention belongs to the technical field of temperature sensors, and particularly relates to a temperature sensor device based on optomagnetic combination power supply.
Background
The switch cabinet is a complete set of switch equipment, the internal structure of the switch cabinet comprises various protection devices such as a circuit breaker, an operating mechanism and a sensor, and the switch cabinet is mainly used for opening and closing and controlling and protecting electric equipment when an electric power system stably runs. Because the high-voltage electrical apparatus inside the switch cabinet can produce resistance loss, hysteresis eddy current loss and dielectric loss and the opening and closing structure has oxidation wear, the temperature inside the switch cabinet can be raised due to aging of a contact of a breaker and loosening of a bus joint, the temperature inside the switch cabinet can be raised due to high tightness and poor ventilation, if heat can not be discharged in time, the contact and a cable crimping point can be burnt due to overhigh temperature rise, even serious accidents such as fire, power failure and explosion of the switch cabinet can be caused, the operation of electric power equipment inside the switch cabinet is abnormal or faults are generally shown as temperature rise, the temperature on-line detection and early warning of the switch cabinet are the most direct and effective means for monitoring the electric power equipment, and the switch cabinet has important significance for the reliability and safety of an electric power system.
At present, a plurality of temperature measurement technologies mainly comprise contact temperature measurement and non-contact temperature measurement, and compared with the traditional method, the method is a wax sheet temperature method, is simple and intuitive, but has low temperature measurement precision and needs regular check by an operator on duty; the optical fiber temperature measurement method is difficult to adapt to the problem of complex wiring in a closed narrow environment in a switch cabinet, and a creepage fault can be caused if dirt exists on the surface of an optical fiber after long-term work; the infrared temperature measurement method is easily influenced by object shielding, the installation problem exists, and signal transmission cannot be carried out in the magnetic field induction electricity taking mode when the current is low.
Disclosure of Invention
In view of the above, the present invention is directed to solving the above-mentioned shortcomings of the current temperature measurement schemes for switch cabinets.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a temperature sensor device based on optomagnetic combined power supply, which comprises: the system comprises a data sending end, a data acquisition end and a display terminal;
the data transmitting terminal is used for acquiring temperature data of each area in the switch cabinet and wirelessly transmitting the temperature data to the acquiring terminal;
the acquisition end is used for judging the change trend of the temperature data of each area in the switch cabinet, when the change trend is that the temperature fluctuates within a set range or the temperature is in a monotone increasing characteristic, the temperature data of the corresponding area is subjected to accumulation processing, and a temperature predicted value is calculated based on the change trend; the alarm device is also used for generating alarm information when the predicted temperature value is greater than the temperature threshold value and wirelessly transmitting the alarm information to the display terminal;
the display terminal is used for displaying alarm information.
Further, performing accumulation processing on the temperature data of the corresponding area, and calculating a predicted temperature value based on the variation trend specifically includes:
sequentially accumulating the original temperature data of the corresponding area to obtain accumulated temperature data;
generating a weighted neighbor based on the raw temperature data;
constructing a temperature prediction model by using the accumulated temperature data and the weighted neighborhood value;
and calculating a temperature predicted value by using the temperature prediction model.
Further, the expression of the temperature prediction model is specifically as follows:
in the formula (I), the compound is shown in the specification,
for the i +1 th predicted temperature accumulation value, x(0)(1) The first initial temperature value, a is the coefficient of development, b is the amount of ash contribution,
is the ith temperature prediction value.
Further, the data sending end specifically includes: the device comprises a temperature sensor, a first processing unit, a wireless transmitting antenna, a light energy charging module, an induction electricity taking module and a current collecting module;
the temperature sensor is used for acquiring temperature data in the switch cabinet;
the first processing unit is used for controlling the temperature sensor to collect temperature data when the set voltage is reached and transmitting the temperature data to the collection end through the wireless transmitting antenna;
the optical energy charging module and the induction electricity taking module are used for storing energy to a set voltage by the capacitor and charging the first processing unit;
the current acquisition module is used for acquiring current data through the hollow coil.
Further, the light energy charging module and the induction electricity taking module are used for storing energy in the capacitor to a set voltage, and the first processing unit is used for controlling the temperature sensor to collect temperature data when the set voltage is reached and specifically comprises the following steps:
the optical energy charging module and the induction electricity taking module respectively acquire electric energy through photoelectric effect and electromagnetic induction and store the electric energy to the capacitor, when the voltage of the capacitor reaches a set working voltage, energy storage is stopped, and the first processing unit controls the temperature sensor to acquire temperature data when the voltage of the capacitor reaches the set working voltage;
when the voltage of the capacitor is reduced to the lowest set voltage, the light energy charging module and the induction electricity taking module start to obtain electric energy and store the energy of the capacitor to the set working voltage again.
Further, the installation position of the data sending end is specifically:
plum blossom contact, female arranging and the cable joint department of cubical switchboard.
Further, the display terminal specifically includes:
a mobile office terminal or a fixed office terminal of a worker.
In summary, the invention provides a temperature sensor device based on optomagnetic combined power supply, which collects temperature data of each area in a switch cabinet, performs cumulative processing on the temperature data of the corresponding area according to a temperature change trend, calculates a temperature predicted value based on the change trend, and generates alarm information when the temperature predicted value is greater than a temperature threshold value so as to remind corresponding staff of processing in time. The device provided by the invention does not need to be checked regularly by an operator on duty, acquires and transmits temperature data in a wireless mode, and calculates a predicted temperature value by utilizing the temperature change trend, thereby realizing more accurate temperature early warning.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram of a temperature sensor device based on optomagnetic combination power supply according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating an installation of a data transmitting end on a tulip contact according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a data transmitting end fixed to a steel cable tie according to an embodiment of the present invention;
fig. 4 is a structural cross-sectional view of a data transmitting end fixed to a steel cable tie according to an embodiment of the present invention.
In the drawings: 1-data sending end, 2-protective shell, 3-through hole and 4-steel ribbon.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The switch cabinet is a complete set of switch equipment, the internal structure of the switch cabinet comprises various protection devices such as a circuit breaker, an operating mechanism and a sensor, and the switch cabinet is mainly used for opening and closing and controlling and protecting electric equipment when an electric power system stably runs. Because the inside high-tension apparatus of cubical switchboard can produce resistive loss, hysteresis eddy current loss and dielectric loss and the structure of opening and shutting appears the oxidation wear, circuit breaker contact ageing and bus-bar joint are not hard up etc. all can make the inside temperature of cubical switchboard rise, the cubical switchboard leakproofness is strong and the air permeability is poor if the heat can not in time be discharged, too high temperature rise can make contact and cable crimping point overheat and burn out, serious accident such as even lead to the cubical switchboard to catch fire and have a power failure explosion, the inside power equipment of cubical switchboard operates unusually or the trouble shows for the rising of temperature usually, therefore the temperature on-line measuring and the early warning of cubical switchboard are to the most direct effectual means of power equipment control, have important meaning to power system's reliability and security.
At present, a plurality of temperature measurement technologies mainly comprise contact temperature measurement and non-contact temperature measurement, and compared with the traditional method, the method is a wax sheet temperature method, is simple and intuitive, but has low temperature measurement precision and needs regular check by an operator on duty; the optical fiber temperature measurement method is difficult to adapt to the problem of complex wiring in a closed narrow environment in a switch cabinet, and a creepage fault can be caused if dirt exists on the surface of an optical fiber after long-term work; the infrared temperature measurement method is easily influenced by object shielding, the installation problem exists, and signal transmission cannot be carried out in the magnetic field induction electricity taking mode when the current is low.
Based on the temperature sensor device, the invention provides a temperature sensor device based on optomagnetic combination power supply.
The following is a detailed description of an embodiment of the present invention, which is based on a temperature sensor device powered by optomagnetic combination.
Referring to fig. 1, the present embodiment provides a temperature sensor device based on optomagnetic combination power supply, including: the system comprises a data sending end, a collecting end and a display terminal.
In this embodiment, the data transmitting terminal is used for acquiring temperature data of each area in the switch cabinet and wirelessly transmitting the temperature data to the acquiring terminal.
The data sending end is provided with a digital temperature sensor, a first processing unit (which can be a wireless MCU), a wireless transmitting antenna, a light energy charging module, an induction electricity taking module and a current collecting module.
In order to collect temperature data of each area in the switch cabinet, a plurality of data sending terminals are required to be arranged. The digital temperature sensor of the data sending end can be provided with different IDs, so that the data sending end is fixed to the plum blossom contact, the busbar and the cable joint respectively, and positions are distinguished through the different IDs. Referring to fig. 2-4, a specific protective casing 2 of the data transmitting terminal 1 is made of epoxy resin material, has the characteristics of insulation and high temperature resistance, effectively protects an internal circuit, is provided with a light energy cell panel on the surface of the casing, and is provided with a through hole 3 inserted with a heat conducting block on the inner side of the protective casing 2, so that a digital sensor can conveniently perform contact temperature measurement, and the measurement is more accurate; the protective shell 2 is inserted and fixed at a temperature measuring point (such as a plum blossom contact) through a steel cable tie 4.
The digital temperature sensor adopts a GX18B20U patch, the design loop is simple and reliable, a single bus can carry out data transmission, the packaging volume is small, and the use is more convenient; the current acquisition module adopts hollow coil sampling and no iron core magnetic saturation; the induction electricity taking module is independent of the current collecting module, adopts an induction coil to take electricity, obtains electric energy by utilizing electromagnetic induction, and supplies power to the wireless MCU through voltage reduction and voltage stabilizing circuit; the wireless MCU is an ultra-low power consumption singlechip; the wireless transmitting antenna is a PCB antenna, and the anti-interference capability is enhanced through reasonable layout of devices and copper-clad grounding treatment.
The optical energy charging module comprises a solar cell panel, a voltage reduction circuit, an overvoltage protection circuit and a DC/DC module circuit. The solar cell panel is a CIGS flexible thin-film solar cell, solar energy is converted into electric energy by utilizing the photoelectric effect, and the work of the optical energy charging module and the induction electricity taking module does not influence each other. When the temperature sensor can work normally by induction power taking and the illumination intensity is insufficient, the wireless MCU is powered by the induction power taking module, and the light energy charging module does not work; when the illumination intensity is enough and the current value of the measuring point is not enough, the light energy charging module supplies power to the wireless MCU, when the illumination intensity and the current value of the measuring point are both enough, the module supplies power earlier in place, the other module does not work, when the illumination intensity and the current value of the measuring point are not enough, the two modules work simultaneously, and finally, energy storage and power supply are carried out through a capacitor in the circuit, so that the power supply mode effectively shortens the vacuum period of the temperature sensor for monitoring the temperature measuring point in real time, and the running condition of the measured equipment is better ensured.
In this embodiment, the acquisition end is configured to determine a variation trend of temperature data of each area in the switch cabinet, and when the variation trend is that temperature fluctuates within a set range or that the temperature monotonically increases, the temperature data of the corresponding area is subjected to accumulation processing, and a temperature prediction value is calculated based on the variation trend; and the alarm information is generated and wirelessly transmitted to the display terminal when the predicted temperature value is greater than the temperature threshold value.
It should be noted that the collector receives the temperature and current data of the data sending end through the wireless radio frequency receiving module; the data processing single chip microcomputer predicts the temperature data; the database comprises real-time temperature, historical temperature, current sampling data, an expert database and basic information data; the alarm can perform early warning by setting temperature thresholds of different levels, and meanwhile, temperature rise prediction information can be displayed on a display screen; the GPRS module is used for transmitting real-time data to the display terminal, so that the current and temperature can be monitored in real time by workers, and faults can be eliminated in time.
The step of calculating the predicted temperature value comprises:
1) and sequentially accumulating the original temperature data of the corresponding area to obtain the accumulated temperature data.
The original temperature data are:
x(0)＝(x(0)(1)，x(0)(2)，……，x(0)(n))
and (3) performing accumulation processing on data:
x(1)(1)＝x(0)(1)
x(1)(2)＝x(0)(1)+x(0)(2)
……
x(1)(n)＝x(0)(1)+x(0)(2)+......+x(0)(n)
the accumulated data is x(1)＝(x(1)(1)，x(1)(2)，......，x(1)(n))。
2) A weighted neighbor is generated based on the raw temperature data.
Weighted neighbor value:
z(0)(2)＝ax(0)(2)+(1-a)x(0)(1)
z(0)(3)＝ax(0)(3)+(1-a)x(0)(2)
……
z(0)(n)＝ax(0)(n)+(1-a)x(0)(n-1)
the number sequence thus obtained is called the neighbor generation number, a is called the generation coefficient, and is usually 0.5, and the neighbor generation sequence z of x (1) is written out(1)＝(z(0)(2)，z(0)(3)，......，z(0)(n))。
3) And constructing a temperature prediction model by using the accumulated temperature data and the weighted neighborhood value.
Firstly, a basic form of a temperature prediction model is constructed:
x(0)(i)+az(1)(i)＝b
wherein
Referred to as the whitened background value; a is called the coefficient of development, b is called the amount of gray effect, so that the least square estimation parameters of the model can be listed
And is provided with
That is, the temperature prediction model can be expressed as
Can obtain the product
Then write the whitening equation of the temperature prediction model
Thereby obtaining a solution of the equation
Wherein i is 1, 2, 3
The predicted value obtained by the above-mentioned method is obtained by carrying out accumulation and subtraction treatment on the predicted value
The model is then precision checked by a posterior differential test method. And calculating the residual error between the measured value and the predicted value, obtaining the variance between the original temperature sequence and the residual error, and determining the precision grade by calculating the ratio of the two data variances.
Residual error:
original temperature sequence variance:
residual variance:
the posterior difference ratio:
the accuracy is better when C < 0.35, and the accuracy is qualified when C < 0.35< 0.5, thereby completing the calculation of the temperature prediction model.
4) And calculating a temperature predicted value by using the temperature prediction model.
In this embodiment, the display terminal is used for displaying alarm information.
The display terminal can be a mobile office terminal or a fixed office terminal of a worker, such as a mobile phone, an ipad or a computer.
The working process of the temperature sensor device based on optomagnetic combined power supply provided by the embodiment is as follows: the data sending end is fixed in plum blossom contact, female arranging and cable joint department respectively through the steel ribbon interlude and carries out temperature and current sampling and set up different ID and distinguish the measuring point, and digital temperature sensor adopts GX18B20U paster, realizes the contact temperature measurement through the heat conduction piece of direct contact protecting sheathing through-hole, only needs single bus can carry out the transmission of temperature data. The current acquisition module adopts an air core coil to carry out current sampling and has no magnetic saturation. The light energy charging module acquires electric energy by utilizing a photoelectric effect, the induction electricity taking module acquires the electric energy by utilizing electromagnetic induction, stable direct current power supply is carried out by voltage reduction and voltage stabilization, the electric energy acquired by the two modules is stored by a capacitor, when the stored voltage exceeds a set working voltage, the single chip microcomputer starts to sample current signals, the two modules stop supplying power to the single chip microcomputer, the current and temperature sampling are synchronously carried out at the moment, the data synchronism is ensured to ensure the accuracy of follow-up temperature rise early warning and prediction time, when the voltage detection circuit detects that the voltage is reduced to the lowest working voltage of the single chip microcomputer, and the two modules continue to store energy and supply power to the set working voltage for the single chip microcomputer. The sampling data is converted into digital signals which can be identified by a singlechip through an AD conversion circuit of a wireless MCU, the digital signals are transmitted to a collector through a wireless transmitting antenna by wireless radio frequency, the collector receives the data through a wireless receiving module, a data processing singlechip carries out temperature early warning judgment according to the received temperature data, alarms with different temperature threshold levels are given out through an alarm, alarm position ID and temperature current data are displayed on a display screen, finally temperature rise prediction is carried out on the measured temperature data, temperature rise trend prediction is obtained through gray prediction algorithm processing, the possibility of future fault occurrence is judged, the protection capability is further improved, meanwhile, temperature current data information and early warning prediction information stored in a database are transmitted to a display terminal through a GPRS module, and workers can conveniently carry out real-time monitoring, and finding and removing faults in time.
The embodiment provides a temperature sensor device based on optomagnetic combines power supply, and the device is through the temperature data of each region in gathering the cubical switchboard to carry out accumulative processing with the temperature data of corresponding region according to the temperature variation trend, calculate the temperature prediction value based on the variation trend, thereby generate alarm information when the temperature prediction value is greater than the temperature threshold and remind corresponding staff in time to handle. The device provided by the invention does not need to be checked regularly by an operator on duty, acquires and transmits temperature data in a wireless mode, and calculates a predicted temperature value by utilizing the temperature change trend, thereby realizing more accurate temperature early warning.
The temperature sensor device has the following advantages:
1. the invention supplies power by the light energy and the energy induced by the magnetic flux metal ribbon at the same time, realizes the compatibility of two power supply modes, solves the problem that the induction electricity taking of the magnetic flux metal ribbon depends on the magnitude of the current value, ensures that the temperature sensor can monitor a measuring point for a longer time, and improves the applicability of the sensor;
2. the Rogowski coil used for CT electricity taking has no iron core, is easy to replace, can select the number of turns of the coil according to the detection requirement, and has the advantages of high precision and no magnetic saturation. The photovoltaic power generation has high power generation efficiency and smaller energy loss, and can provide reliable and stable power supply for the data sending end;
3. the temperature sensor adopts a GX18B20U digital temperature sensor patch, a single bus can carry out data transmission, digital quantity can be directly output to be directly read by a single chip microcomputer, a designed loop is simple, the size of a measurement module is effectively reduced, and the temperature sensor has high precision, low power consumption, high transmission speed and high anti-interference capability;
4. the wireless transmitting antenna adopts a PCB antenna, the hardware volume and the development cost are reduced, the use is more convenient, devices are placed in the vicinity of the wireless transmitting antenna as few as possible, the blank position is grounded by covering copper, the anti-interference capability is enhanced, and the wireless performance is optimized through a balun circuit consisting of a capacitor and an inductor, so that the radio frequency communication precision is high and the sensitivity is excellent.
5. The temperature prediction model is established, temperature prediction can be carried out by using fewer samples, satisfactory accuracy is achieved, meanwhile, compared with a traditional prediction method, the temperature prediction method has the advantage of simplicity in calculation, early-finding early-warning of temperature faults of the switch cabinet is achieved by predicting the temperature, and damage brought by the faults is reduced to the minimum.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A temperature sensor device based on optomagnetic combination power supply, characterized by comprising: the system comprises a data sending end, a collecting end and a display terminal;
the data sending end is used for collecting temperature data of each area in the switch cabinet and wirelessly transmitting the temperature data to the collecting end;
the acquisition end is used for judging the change trend of the temperature data of each area in the switch cabinet, when the change trend is the fluctuation of the temperature within a set range or the temperature is a monotone increasing characteristic, the temperature data of the corresponding area is subjected to accumulation processing, and a temperature predicted value is calculated based on the change trend; the system is also used for generating alarm information and wirelessly transmitting the alarm information to the display terminal when the predicted temperature value is greater than a temperature threshold value;
and the display terminal is used for displaying the alarm information.
2. The temperature sensor device based on optomagnetic combination power supply according to claim 1, wherein the temperature data of the corresponding area is subjected to an accumulation process, and the calculating of the predicted temperature value based on the variation trend specifically comprises:
sequentially accumulating the original temperature data of the corresponding areas to obtain accumulated temperature data;
generating a weighted neighbor based on the raw temperature data;
constructing a temperature prediction model by using the accumulated temperature data and the weighted neighbor value;
and calculating a temperature prediction value by using the temperature prediction model.
3. The optomagnetic combination power supply-based temperature sensor device of claim 2, wherein the expression of the temperature prediction model is specifically:
in the formula (I), the compound is shown in the specification,
for the i +1 th predicted temperature accumulation value, x(0)(1) The first initial temperature value, a is the coefficient of development, b is the amount of ash contribution,
is the ith temperature prediction value.
4. The temperature sensor device based on optomagnetic combination power supply of claim 1, wherein the data sending end specifically comprises: the device comprises a temperature sensor, a first processing unit, a wireless transmitting antenna, a light energy charging module, an induction electricity taking module and a current collecting module;
the temperature sensor is used for acquiring temperature data in the switch cabinet;
the first processing unit is used for controlling the temperature sensor to acquire the temperature data when the set voltage is reached and transmitting the temperature data to the acquisition end through the wireless transmitting antenna;
the optical energy charging module and the induction electricity taking module are used for storing energy to the set voltage through a capacitor and charging the first processing unit;
the current acquisition module is used for acquiring current data through the hollow coil.
5. The temperature sensor device based on optomagnetic combination power supply of claim 4, wherein the optical energy charging module and the induction power taking module are configured to store energy in a capacitor to the set voltage, and the first processing unit is configured to control the temperature sensor to collect the temperature data when the set voltage is reached specifically:
the optical energy charging module and the induction electricity taking module respectively acquire electric energy through photoelectric effect and electromagnetic induction and store the electric energy to the capacitor, when the voltage of the capacitor reaches a set working voltage, energy storage is stopped, and the first processing unit controls the temperature sensor to acquire the temperature data when the voltage of the capacitor reaches the set working voltage;
when the voltage of the capacitor is reduced to the lowest set voltage, the light energy charging module and the induction electricity taking module are started to obtain electric energy and store the energy of the capacitor to the set working voltage again.
6. The temperature sensor device based on optomagnetic combination power supply of claim 1, wherein the mounting position of the data sending end is specifically:
plum blossom contact, female arranging and the cable joint department of cubical switchboard.
7. The temperature sensor device based on optomagnetic combination power supply of claim 1, wherein the display terminal is specifically:
a mobile office terminal or a fixed office terminal of a worker.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901003A (en) * | 2022-11-23 | 2023-04-04 | 南京乾鑫电器设备有限公司 | Temperature monitoring method and system for environment-friendly gas switch cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901003A (en) * | 2022-11-23 | 2023-04-04 | 南京乾鑫电器设备有限公司 | Temperature monitoring method and system for environment-friendly gas switch cabinet |
| CN115901003B (en) * | 2022-11-23 | 2024-04-09 | 南京乾鑫电器设备有限公司 | Temperature monitoring method and system for environment-friendly gas switch cabinet |
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