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安全柵又被稱為安全保持器

2022-05-20 18:57:54 來源:http://www.dancheditu.com/ 53

安全柵又被稱為安全保持器。具有本安回路的安全接口,它能夠在安全區還有危險區之間來雙向轉遞電信號,并且可以限制因為故障所引起的安全區向危險區還有能量轉遞。一般的安全柵主要有齊納式、隔離式。
Safety barrier is also called safety retainer. The safety interface with intrinsically safe circuit can transmit electric signals in both directions between the safety zone and the dangerous zone, and can limit the transmission of energy from the safety zone to the dangerous zone caused by fault. General safety barriers mainly include Zener type and isolation type.
本安型安全柵應用在本安防爆系統的設計當中,它是安裝在安全場所并且含有本安電路還有非本安電路的裝置,電路中通過限流還有限壓電路限制了送往現場本安回路的能量,從而也防止非本安電路的危險能量串入本安電路,它是在本安防爆系統中被稱為關聯設備,是本安系統的一個重要組成部分。
Intrinsically safe safety barrier is used in the design of intrinsically safe explosion-proof system. It is a device installed in a safe place and contains intrinsically safe circuit and non intrinsically safe circuit. In the circuit, the energy sent to the on-site intrinsically safe circuit is limited by current limiting and voltage limiting circuit, so as to prevent the dangerous energy of non intrinsically safe circuit from cascading into the intrinsically safe circuit. It is called associated equipment in the intrinsically safe explosion-proof system and an important part of the intrinsically safe system.
浙大中控dcs卡件XP313
安全柵更換的時候應該注意斷電。安全柵是控制現場能量的有效部件,但是無論是齊納安全柵,隔離安全柵,需要考慮的有工作環境(如使用溫度,濕度)、裝置方式是否便于現場安裝;要根據需要防爆的區域來看,0區、1區還是2區用來確定所需要達到的防爆等級,最后可以確定的是用ia級的還是用ib級的安全柵;需要保證系統的工作正常,還需要根據系統的參數,來確定安全柵的參數,齊納安全柵主要是看工作電壓,最高工作電壓,端電阻等參數,隔離安全柵主要是看可以達到的精度。安全柵的選型在使用當中是比較關鍵的,選擇正確的安全柵就是保證系統防爆的基礎。
When replacing the safety barrier, pay attention to power off. The safety barrier is an effective component for controlling the on-site energy. However, whether it is Zener safety barrier or isolation safety barrier, it is necessary to consider the working environment (such as service temperature and humidity) and whether the device mode is convenient for on-site installation; According to the area requiring explosion-proof, zone 0, zone 1 or zone 2 are used to determine the explosion-proof level to be achieved. Finally, it can be determined whether to use class IA or class Ib safety barrier; It is necessary to ensure the normal operation of the system and determine the parameters of the safety barrier according to the parameters of the system. The zener safety barrier mainly depends on the working voltage, maximum working voltage, terminal resistance and other parameters, and the isolation safety barrier mainly depends on the achievable accuracy. The selection of safety barrier is the key in use. Choosing the correct safety barrier is the basis to ensure the explosion-proof of the system.
在生產過程當中大量使用電氣設備,各種磨擦出來的電火花、靜電火花、高溫等不可避免,尤其是當設備發生故障的時候,都有可能會點燃爆炸的環境。為了要防止爆炸的發生,至今已經開發了8種不同的防爆技術,其中安全柵就是一種低成本而高有效的防爆技術。安全場所的控制室設備是通過安全柵跟危險場所的本安設備相連,傳送信號或能量。其主要利用限流還有限壓電路,限制了從安全場所傳遞到危險場所的所有能量。處于危險場所的本安設備在這樣的一個能量下能夠正常工作,即使是本安設備自身發生的故障,也不會產生任何一個足以引燃的電火花或者發熱表面。因此,無論是安全場所的控制室設備還是在危險場所的本安設備發生故障,只要安全柵的限流限壓電路正常的工作,整個系統都會處在一個安全的狀態,不會產生爆炸。許多工業過程中,需要處置或者使用一些易燃材料,如原油和它衍生物,酒精,天然氣,粉末,飛揚物,任何滲漏或濺出都有可能形成一個爆炸環境。為了工廠和人員的平安,必需確保這個環境不會被點燃引起爆炸。
Electrical equipment is widely used in the production process, and all kinds of electric sparks, electrostatic sparks and high temperature caused by friction are inevitable. Especially when the equipment fails, it may ignite the explosive environment. In order to prevent explosion, eight different explosion-proof technologies have been developed so far, among which safety barrier is a low-cost and high effective explosion-proof technology. The control room equipment in safe places is connected with the intrinsically safe equipment in dangerous places through safety barriers to transmit signals or energy. It mainly uses current limiting and voltage limiting circuits to limit all energy transmitted from safe places to dangerous places. The intrinsically safe equipment in dangerous places can work normally under such an energy, and even the failure of the intrinsically safe equipment itself will not produce any electric spark or heating surface enough to ignite. Therefore, whether the control room equipment in safe places or the intrinsically safe equipment in dangerous places fails, as long as the current and voltage limiting circuit of the safety barrier works normally, the whole system will be in a safe state and will not explode. In many industrial processes, some flammable materials need to be disposed of or used, such as crude oil and its derivatives, alcohol, natural gas, powder and flying objects. Any leakage or spill may form an explosive environment. For the safety of factories and personnel, it is necessary to ensure that this environment will not be ignited and cause explosion.
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