relay-coordination 1.0.2

ETAP-style relay coordination simulation for pandapower

Relay Coordination Package

Professional ETAP-style protection coordination simulation library for Pandapower.

Features

• Relay Modeling: IEC 60255, IEEE C37, IEC 61363 curves
• Analysis: Short circuit (IEC 60909) and Coordination analysis
• Reporting: Automatic CSV generation and TCC plotting
• Easy API: Simple integration with pandapower networks

Installation

pip install relay_coordination

Reference

1. Device Creation

add_ct(net, ...)

Adds a Current Transformer to the network.

Parameter	Type	Default	Description
net	pandapowerNet	Required	The network object
bus	int	Required	Bus index where CT is located
element	int	Required	Index of the protected element (line/trafo)
element_type	str	Required	Type of element ("line", "trafo", "load")
primary_rating	float	Required	CT primary current (e.g., 200)
secondary_rating	float	5.0	CT secondary current (1 or 5)
accuracy_class	str	"5P20"	IEC/ANSI accuracy class
burden_va	float	15.0	Rated burden in VA
name	str	None	Name of the CT

add_relay(net, ...)

Adds a Protection Relay connected to a CT.

Parameter	Type	Default	Description
net	pandapowerNet	Required	The network object
ct	CT	Required	Associated CT object
cb	CircuitBreaker	Required	Associated Circuit Breaker object
manufacturer	str	"Generic"	Relay manufacturer
model	str	"Overcurrent"	Relay model
Phase Protection
phase_pickup	float	None	Pickup setting (A)
phase_curve	str	"IEC_NI"	Curve type (IEC_NI, IEEE_MI, etc.)
phase_tms	float	None	Time Multiplier Setting
phase_inst_pickup	float	None	Instantaneous pickup (A)
phase_inst_delay	float	0.0	Instantaneous time delay (s)
Ground Protection
ground_pickup	float	None	Ground pickup setting (A)
ground_curve	str	"IEC_NI"	Curve type
ground_tms	float	None	Time Multiplier Setting
ground_inst_pickup	float	None	Ground instantaneous pickup (A)

add_cb(net, ...)

Adds a Circuit Breaker.

Parameter	Type	Default	Description
net	pandapowerNet	Required	The network object
bus	int	Required	Bus index
rated_voltage_kv	float	Required	Rated voltage (kV)
continuous_current_a	float	Required	Rated continuous current (A)
interrupting_rating_ka_sym	float	Required	Symmetrical interrupting rating (kA)
operating_time_cycles	float	5.0	Opening time in cycles (at 60Hz)
cb_type	str	"VCB"	Type (VCB, ACB, OCB)

2. Analysis Functions

run_coordination_analysis(net, ...)

Tests coordination between protective devices.

Parameter	Type	Default	Description
net	pandapowerNet	Required	The network object
test_currents	List[float]	None	List of fault currents to test (A)
fault_type	str	"phase"	"phase" or "ground"
export_csv	bool	True	Save results to CSV
output_dir	str	"data"	Output directory for CSV

run_sc_analysis(net, ...)

Performs IEC 60909 short circuit calculation.

Parameter	Type	Default	Description
net	pandapowerNet	Required	The network object
export_csv	bool	True	Save results to CSV
check_breakers	bool	True	Check if fault duty exceeds breaker rating
output_dir	str	"data"	Output directory

3. Plotting

plot_tcc_curves(relays, ...)

Generates Time-Current Characteristic curves.

Parameter	Type	Default	Description
relays	List[Relay]	Required	List of relay objects to plot
current_min	float	10	Minimum current on X-axis
current_max	float	10000	Maximum current on X-axis
fault_type	str	"phase"	"phase" or "ground"
title	str	"TCC..."	Plot title
filename	str	None	Output file (e.g. "tcc.png")
figsize	tuple	(10, 6)	Figure size (width, height)

Supported Curves

IEC 60255:

• IEC_NI (Normal Inverse)
• IEC_VI (Very Inverse)
• IEC_EI (Extremely Inverse)
• IEC_LTI (Long Time Inverse)

IEEE C37.112:

• IEEE_MI (Moderately Inverse)
• IEEE_VI (Very Inverse)
• IEEE_EI (Extremely Inverse)

IEC 61363 (Marine):

• IEC_61363_S (Short Time Delay)
• IEC_61363_L (Long Time Delay)