Successful dc voltage monitoring relay for High-Risk Applications
Reliable dc voltage monitoring relay Styles for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their whole range of dc voltage monitoring relay . They provide a full set of dc voltage monitoring relay goods as well as other interrelated products. These units are noticed in distinct applications which include industrial applications, industrial handle circuits together with OEM Panels. These devices come with excellent precision and repeatability. The common dc voltage monitoring relay which are developed nowadays require extremely little panel space.
single phase ac/dc voltage monitoring relay
dc voltage monitoring relays
Contact rating: 3A 24VDC. Built-in buzzer output (150mA 24VDC). Includes double-sided foam tape. This timer module will extend the activation time of a momentary contact switch for 1 to 60 seconds via a field-adjustable rotary pot. It is ideal for ele
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this means as a protection for the generator, ex. over frequency, under frequency protection relays. what component (in this relays) detecting this variation of the frequency? like current transformers are used to detect variation in current)...please help
And got the following answer:
A circuit to operate high and low trips for frequency? The basic component is a voltage to frequency converter. This can be a frequency sensitive circuit to operate a relay, using inductors or capacitors, often in a bridge arrangement. The description below is for a low cost and accurate analogue electronic approach. There are also more digital approaches measuring the period between zero crossings. Use a voltage transformer to provide a few volts that is a sample of the generator voltage. It can be filtered to reduce higher frequency interference using a simple RC filter. A threshold detector (voltage comparator or schmidt trigger) converts the sine wave to a square wave. The trigger threshold reference can be 0V for a zero crossing detector, or maybe half the peak voltage. This can be used to trigger a monostable that generates pulses of constant width, one for each cycle. For 50Hz the monostable could be around 15ms of the 20ms duration, considering 55Hz is probably the high threshold for a generator. The output of the monostable is a series of constant width pulses that can be integrated (filtered) to provide close to a DC voltage that is proportional to frequency. This voltage is then used to operate separate voltage comparators for high and low frequency. The comparator outputs operate alarm relays. There may need to be a delay so temporary overshoots during a load change are ignored. Each of these stages can be provided by a 555 timer and a few other components. Use a measured frequency source to calibrate this. There are commercial frequency monitoring relays that perform this. First link is one example. The second link is a very basic form of the circuit described above, using a single 555 timer IC. It provides a DC voltage proportional to frequency. The 555 timer is used as a monostable, should have a regulated supply voltage (5 to 12V) and the period should be set to 15ms. Look up 555 timer for more info. There are numerous ways to do this. You might find other examples by searching for tachometer circuits.
The dc voltage monitoring relay perform very nicely with unique applications that happen to be distinct to energy distribution and protection. The relays come with wide adjustment ranges having a scale that is certainly easy to read either in three or 4 digits according to the model. These dc voltage monitoring relay enable in rising the flexibility of the applications, minimize the all round power and upkeep costs. You will find relays that are employed for basic purposes which come in reputable designs with speedy replacement possibilities. And you will find models which are made use of for industrial applications and heavier duty applications that perform on large loads. These merchandise are created to meet the lifetime industrial manage wants from the applications.
Their most recent items will be the Time counter, Timer Delay, dc voltage monitoring relay, Swift Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and many other folks. The web page gives a detailed description of each and every model in various categories of dc voltage monitoring relay couplings and sensors. These items are extremely valuable for high-risk applications. The dc voltage monitoring relay are also available with features like numerous timing ranges and functions. The business is presently searching for agents and dealers who can promote and sell their factory created goods. They’re generally on a lookout for building new and more dependable items determined by the demands and specifications on the business.
The dc voltage monitoring relay operate really effectively with unique applications which might be precise to power distribution and protection. The relays include wide adjustment ranges using a scale that is certainly easy to study either in three or 4 digits based on the model. These dc voltage monitoring relay assistance in escalating the flexibility of your applications, decrease the all round power and maintenance costs. You will discover relays which are employed for general purposes which come in reputable styles with fast replacement solutions. And you can find models that happen to be made use of for industrial applications and heavier duty applications that work on massive loads. These merchandise are created to meet the lifetime industrial handle needs with the applications.
Their most recent goods would be the Time counter, Timer Delay, dc voltage monitoring relay, Fast Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and several other people. The web site presents a detailed description of each and every model in different categories of dc voltage monitoring relay couplings and sensors. These merchandise are extremely useful for high-risk applications. The dc voltage monitoring relay are also obtainable with features like numerous timing ranges and functions. The company is at present searching for agents and dealers who can promote and sell their factory made products. They are constantly on a lookout for creating new and more reputable goods according to the demands and needs with the market.