Component to introduce time-delay

[Wrichik Basu]

I need a component that can provide a time-delay in my circuit.

I recently bought a stabiliser for my refrigerator. It has an intelligent time-delay system: if the stabiliser is switched on and off within three minutes, then a time delay of five minutes is induced, otherwise it just starts without delay.

I want a delay in the circuit regardless of the time for which the power was off. For example, a delay of 15 seconds is ideal. I want it such that when the switch is turned on, then a delay of 15 seconds will be given, and after that, the output will be sent from the component.

It should work in a range of 180V to 260V AC of frequency 50Hz. The maximum current cannot be less than 7A.

I'll fix this component before the stabiliser, that is, current will first pass through the component, then after the time delay, it will go to the stabiliser.

Which component will work here?

Please note that I haven't got a good background in electronics. If you tell me the component, and how to use it, I'll put it in the circuit appropriately.

 

[berkeman]

What is a stabilizer in this context? Can you draw a sketch of your system and where you want to introduce a time delay?

 

[Wrichik Basu]

What is a stabilizer in this context? Can you draw a sketch of your system and where you want to introduce a time delay?

Stabiliser is a voltage stabiliser, one used to minimise voltage fluctuations.

A circuit diagram:

 

[anorlunda]

I want it such that when the switch is turned on, then a delay of 15 seconds will be given, and after that, the output will be sent from the component.

That sounds like a time delay relay, not a stabilizer. A Google search for "time delay relay" will show you hundreds to choose from.

 

[berkeman]

I recently bought a stabiliser for my refrigerator.

You are periodically turning off your refrigerator by disconnecting the AC Mains? I hope you don't have perishable food in the 'fridge...?

 

[rootone]

Stabiliser is a voltage stabiliser, one used to minimise voltage fluctuations.

Why do you expect your mains supply is likely to suffer with significant voltage fluctuation?
Typically main power supplies can vary +/- 5% or so. but usually much less than that.
This should not be a problem for a fridge, which essentially is a specialised sort of a pump.

 

[Wrichik Basu]

You are periodically turning off your refrigerator by disconnecting the AC Mains? I hope you don't have perishable food in the 'fridge...?

No. When there is a power cut for a long time, and the power returns, there is some voltage fluctuations when the inverter stops and the mains are turned on automatically. Generally the stabilisers cannot handle this subtle voltage variations, but sometimes they do harm to the refrigerator compressor. Hence I was searching for a time delay unit.

 

[Wrichik Basu]

Why do you expect your mains supply is likely to suffer with significant voltage fluctuation?
Typically main power supplies can vary +/- 5% or so. but usually much less than that.
This should not be a problem for a fridge, which essentially is a specialised sort of a pump.

In our area, the voltage should range between 220V to 230V. In summer, it goes down to 180V. The refrigerator cannot handle that. It's an old model. That's why a stabiliser was installed. Then I read online that a time delay may be necessary for power cuts. Hence I am searching for a time delay component.

 

[Wrichik Basu]

That sounds like a time delay relay, not a stabilizer. A Google search for "time delay relay" will show you hundreds to choose from.

I wanted a time delay relay, not a stabiliser. Thanks, I've got what I was expecting online.

 

[NascentOxygen]

You have batteries & an inverter that supply power to your fridge immediately mains power drops out, and you want your batteries & inverter to continue to power your fridge for an extra 15 seconds after mains supply is restored to your home?

 

[Wrichik Basu]

You have batteries & an inverter that supply power to your fridge immediately mains power drops out, and you want your batteries & inverter to continue to power your fridge for an extra 15 seconds after mains supply is restored to your home?

1. The invertor doesn't supply electricity to the fridge.

2. I want the fridge to be off for an extra 15s after power is restored.

3. When the power is restored, I find that there are some large fluctuations in voltage after the invertor switches itself off. I don't know what causes that, but somehow it happens. For example, the voltage suddenly goes down to 190V from the standard 220V, and again becomes normal in no time. These fluctuations are gone in about 5s. All my important appliances have stabilisers with inbuilt time delay. But the refrigerator stabiliser doesn't have the delay. So I want to put an external delay.

 

[NascentOxygen]

I wanted a time delay relay, not a stabiliser. Thanks, I've got what I was expecting online.

So you have found what you are needing, and this thread can be marked closed?

 

[Wrichik Basu]

So you have found what you are needing, and this thread can be marked closed?

Yes, you can close it.

 

[anorlunda]

The OP was apparently wrestling with the problem of restoring loads after a blackout. If they all start at once with startup surges, it causes overloads. The remedy is to stagger restoration of different loads.

He also used the wrong words to express his question, which led everyone astray. Sometimes when a question seems to make no sense, the cause is the wrong choice of technical words.

Thread closed at the request of the OP.