Stationary battery ayon sa duty cycle
I-size ang stationary battery at charger ayon sa duty cycle.
Subukan ang isang job 4
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Size a substation battery by duty cycleThe Ah and charger of a 125 V battery for a trip and three hours of load.
- Size a 48 V radio site batteryThe Ah and charger for four hours of radio load and a transmit burst.
- Size a 24 V control panel batteryThe Ah for two hours of PLC load and a valve close at the end.
- Find the charger for a faster rechargeThe charger current to put a 110 V battery back in 8 h, not 12.
Mga input
Worked example gamit ang mga default na input.
- Nominal battery voltage
- 110 V
- Mga cell na naka-series
- 55
- Pinakamababang boltahe na tinatanggap ng mga load
- 96 V
- Mga period, isa-isang sumusunod
- 3 row
- Rate factor
- 1
- Temperature factor
- 1
- Design margin
- 1.1
- Ageing factor
- 1.25
- Load sa charger habang nagre-recharge
- 10 A
- Recharge time
- 12 h
- Recharge factor
- 1.1
Kapasidad batay sa Ah
112.1Ah
- Ampere-hours ng duty
- 81.5Ah
- Current ng charger
- 17.5A
- Dulong boltahe kada cell
- 1.75V
- Pinakamataas na current sa duty
- 70A
- Enerhiya sa nominal na boltahe
- 12.33kWh
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Panahon 1: 70 A sa loob ng 1 min1.17Ah
- Panahon 2: 10 A sa loob ng 478 min79.67Ah
- Panahon 3: 40 A sa loob ng 1 min0.67Ah
- Ampere-hours ng duty81.5Ah
- Haba ng duty480 min
- Rate factor, mula sa table ng gumawa×1.00
- Temperature factor×1.00
- Design margin×1.10
- Ageing factor×1.25
- Kapasidad batay sa AhResulta112.1Ah
- Dulong boltahe kada cell
96 V ÷ 55 cells = 1.745 V
- Current ng charger17.5A
- Enerhiya sa nominal na boltahe12.33kWh
Tungkol sa calculator na ito
How this is calculated
A stationary battery carries a site's d.c. loads when the charger loses its supply: protection relays, breaker trip and close coils, emergency lights, radios, controls. Those loads change through the outage. The duty cycle lists them in order, as a current for a number of minutes.
The tool adds the ampere-hours of each period: the current times the minutes over sixty. That is the charge the duty takes out of the battery.
A battery gives less than its rated capacity when it discharges faster than its rated hours, or to a higher end voltage. So the tool multiplies the duty by a rate factor you read from the maker's table. It then applies a temperature factor for a cold battery room, a design margin for growth and unknowns, and an ageing factor so the battery still does the duty near the end of its life. The product is the capacity by ampere-hours. When a later period draws more than the one before it, that sum is too small, and the tool warns.
The end voltage per cell is the lowest voltage your loads accept, at the battery terminals, over the number of cells in series. Read the maker's capacity at that end voltage.
The charger must carry the standing load and put back what the duty took, with a margin for charge losses, in the recharge time you set. The tool adds the continuous load to the duty's ampere-hours times the recharge factor over the hours.
AmpSize does not hold IEEE 485 or any cell's capacity factors. With the maker's Kt on every period, the tool works the last section, each change in current times its Kt, and that figure governs. Every factor is an assumption you set, and the result says so.
| Step | Table or clause | What it decides |
|---|---|---|
| Duty | Σ I × t ÷ sixty | The ampere-hours the periods take out |
| Capacity | Duty × rate × temperature × margin × ageing | The battery capacity by ampere-hours |
| Sections | Σ ΔI × Kt × temperature × margin × ageing | The capacity with the maker's Kt, which governs |
| End voltage | Lowest voltage ÷ cells | The end voltage per cell to read the maker's table at |
| Charger | Continuous load + duty × recharge factor ÷ hours | The charger current |
Worked examples
- A 110 V substation battery for a trip, eight hours of standing load and a close needs 112.1 Ah. The duty takes 81.5 Ah, with a charger of 17.5 A to recharge in 12 hours.
- A 125 V battery for a trip and three hours of lights and controls needs 159.2 Ah. The duty takes 91.5 Ah, with a charger of 25.1 A.
- A 48 V radio site with a transmit burst needs 49.7 Ah. The duty takes 36.17 Ah, with a charger of 12 A. The burst draws more than the radio load, so the tool warns that the sum understates the battery.
- A 24 V control panel with a valve close at the end needs 11.7 Ah. The duty takes 8.5 Ah, with a charger of 5.2 A. The valve close draws more than the load before it, so the tool warns that the sum understates the battery.
Limits
Without Kt values, the tool adds ampere-hours. A battery's capacity falls at high rates, so a heavy load of a minute or two can need far more than its ampere-hours show. The rate factor carries that, and only the maker's table gives it.
It does not pick a cell, a chemistry or a float voltage, and it does not check ventilation or the battery room. Follow the maker's data for those.
See also: Battery, Fire alarm battery and DC cable size.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Paano i-size ang battery para sa duty cycle?
Ilista kung ano ang kailangang dalhin ng battery, period por period: ang current at ang minuto. Idagdag ang ampere-hours. Paramihin sa rate factor mula sa table ng maker, temperature factor, design margin at ageing factor. Kapag mas maraming hinihila ang susunod na period kaysa sa nauna, kulang ang kabuuan: gamitin ang Kt ng maker at ang section method.
Bakit kailangan ng maikli at mabigat na load ng higit pa sa ampere-hours nito?
Mas kaunti ang ampere-hours na naibibigay ng battery sa mataas na rate kaysa sa rated rate nito. Ang one-minute trip load ay puwedeng mangailangan ng mas maraming capacity kaysa sa bahagi nito sa duty. Isinasaalang-alang ito ng rate factor mula sa table ng maker sa end voltage mo.
Anong end voltage kada cell ang dapat kong gamitin?
Hatiin ang pinakamababang voltage na tinatanggap ng load mo, sa battery, sa bilang ng cell. Basahin ang capacity ng maker sa end voltage na iyon. Mas mataas na end voltage ay nagbibigay ng mas kaunting capacity mula sa parehong cell.
Gaano kalaki dapat ang charger?
Pinagdadala ng charger ang standing load at ibinabalik ang ampere-hours na nakuha, plus kaunti pa, sa recharge time. Idinadagdag ng tool ang continuous load sa duty's ampere-hours na i-multiply sa recharge factor, hinati sa mga oras.
Sumusunod ba ang tool sa IEEE 485?
Walang hawak na IEEE 485 o anumang Kt value ng cell ang AmpSize. I-enter ang Kt ng maker sa bawat period at gagawin ng tool ang huling bahagi ng method. Kung wala ang mga iyon, idinadagdag nito ang ampere-hours, ina-apply ang factors mo at nagbababala kapag mas maraming hinihila ang susunod na period.
Mga kaugnay na tool
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