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import streamlit as st
import math
import itertools
# Title
st.title("⚡ Three-Phase Power Calculator - Reactive Power Compensation Panel")
# Sidebar
st.sidebar.header("🔧 Input Parameters")
voltage = st.sidebar.number_input("Enter Voltage (V)", min_value=0.0, step=0.1)
current = st.sidebar.number_input("Enter Current (A)", min_value=0.0, step=0.1)
power_factor = st.sidebar.slider("Power Factor (optional, default = 1)", 0.0, 1.0, 1.0, step=0.01)
frequency = st.sidebar.selectbox("Select Frequency", [50, 60], index=0) # Frequency in Hz
# Available Capacitor Units (kVAR)
available_capacitors = [25, 20, 15, 10, 5, 2.5, 1.5, 1]
# Main Tabs
tab1, tab2, tab3 = st.tabs(["📊 Calculation", "🧮 Capacitor Bank Design", "📋 About"])
with tab1:
st.header("📊 Electrical Calculation")
if st.button("Calculate Power Parameters"):
if voltage > 0 and current > 0:
# Apparent Power (VA) for Three-Phase
apparent_power = math.sqrt(3) * voltage * current
# Real Power (kW)
real_power = apparent_power * power_factor / 1000 # W to kW
# Reactive Power (kVAR)
try:
reactive_power = math.sqrt((apparent_power / 1000)**2 - real_power**2)
except ValueError:
reactive_power = 0.0
# Calculated PF
calculated_pf = real_power * 1000 / apparent_power if apparent_power > 0 else 0
st.subheader("🔎 Results:")
st.success(f"Apparent Power: **{round(apparent_power, 2)} VA**")
st.success(f"Real Power: **{round(real_power, 2)} kW**")
st.success(f"Reactive Power: **{round(reactive_power, 2)} kVAR**")
st.info(f"Calculated Power Factor: **{round(calculated_pf, 2)}**")
st.session_state['reactive_power'] = reactive_power
else:
st.warning("⚠️ Please enter valid Voltage and Current!")
with tab2:
st.header("🧮 Capacitor Bank Designer")
if 'reactive_power' in st.session_state and st.session_state['reactive_power'] > 0:
reactive_power = st.session_state['reactive_power']
st.success(f"Target Compensation: **{round(reactive_power,2)} kVAR**")
num_caps = st.number_input("How many capacitors do you want to use?", min_value=1, step=1)
if num_caps > 0:
if st.button("Find Capacitor Combination"):
# Try to find a combination
found = False
best_combo = None
min_error = float('inf')
# Generate combinations with repetition
for combo in itertools.combinations_with_replacement(available_capacitors, int(num_caps)):
total = sum(combo)
error = abs(total - reactive_power)
# Find the combination closest to the required reactive power
if error < min_error:
min_error = error
best_combo = combo
if error == 0:
break # exact match found
if best_combo:
st.subheader("🛠️ Suggested Capacitor Sizes:")
for idx, cap in enumerate(best_combo, start=1):
st.write(f"🔹 Capacitor {idx}: **{cap} kVAR**")
total_kvar = sum(best_combo)
st.success(f"✅ Total Compensation: **{round(total_kvar,2)} kVAR**")
if abs(total_kvar - reactive_power) > 0.5:
st.warning("⚠️ Small mismatch detected. Fine-tuning may be required.")
else:
st.error("❌ Could not find a suitable combination with the given number of capacitors.")
else:
st.info("Please first calculate in 📊 Calculation tab.")
with tab3:
st.header("📋 About This Tool")
st.markdown("""
This app is designed for engineers and manufacturers to:
- Calculate three-phase system parameters
- Estimate reactive power
- Design capacitor banks based on user preferences
---
**Developed by:** Muhendis & ChatGPT 🚀
""")
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