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# Measuring Transformers

There are three models of measuring transformers in HYPERSIM®. These are voltage transformers with capacitive coupling, current transformers, and finally voltage transformers with magnetic coupling.

**Capacitive Divider**

**C1, C2:**Capacitances of voltage divider (farad);**Rc, Lc, Cc:**Respectively resistance (ohm), capacitance (farad) and inductance (henry) of the tuning circuit. The values of these parameters are chosen so that the resonance frequency of the series impedance on the secondary side is 60 Hz.

**Primary Winding Parameters**

Number of turns | (default: np = 18240) |

Rp, Lp | Leakage resistance (ohm) and inductance (henry) |

Rm | Resistance (ohm) representing magnetization losses |

Cp | Stray capacitance (farad) |

**Saturation parameters:**

Number of points | The value of the current (in ampere) for each segment of the saturation curve. The origin (0.0,0.0) is implied. The number of segments must be equal to the parameter “number of points” |

lsat | The value of the flux (in volt-second) for each segment of the saturation curve. The origin (0.0,0.0) is implied. The number of segments must be equal to the parameter “number of points” |

**Secondary Winding Parameters**

Number of turns | (default: ns = 100) |

Rs, Ls | Leakage resistance (ohm) and inductance (henry) |

R, RL, LL | Resistances (ohm) and load inductance (henry) |

**List of Available Signals**

At acquisition, the following signals are made available by the sensors:

VOUT(a, b, c)_label | Output voltage (V) |

VMAG(a,b,c)_label | Voltage in magnetization branch (V) |

IMAG(a,b,c)_ label | Magnetization current (A) |

FLUX(a,b,c)_label | Mutual flux in the transformer (V.s) |

VLOADSEC(a,b,c,n)_label | Load voltage on the secondary |

VLOADTERT(a,b,c,n)_label | Load voltage on the tertiary |

ILOADSEC(a,b,c,n)_label | Load current on the secondary |

ILOAD TERT(a,b,c,n)_label | Load current on the tertiary |

ILOAD TERT(0)_label | Ground current on the tertiary |

**Control Panel of Measuring Transformers**

Figures below show the control panel of voltage transformers with capacitive voltage divider;

Figures below show the control panel of the current transformer and Figures 8 - 42 to 8- 47 show the control panel of the voltage transformer with magnetic coupling;

Control Panel of a Voltage Transformer with Capacitive Voltage Divider (General)

Control Panel of a Voltage Transformer with Capacitive Coupling (Saturation)

Saturation Characteristic of a Current Transformer (Saturation)

Saturation Characteristic of a Current Transformer (Hysteresis)

Voltage Transformer with Magnetic Coupling (General)

Voltage Transformer with Magnetic Coupling (Saturation)

Figure 8 - 44 Voltage transformer with magnetic coupling (general)

Figure 8 - 45 Voltage transformer with magnetic coupling (configuration)

Voltage Transformer with Magnetic Coupling (Saturation)

Voltage Transformer with Magnetic Coupling (Hysteresis)

OPAL-RT TECHNOLOGIES, Inc. | 1751, rue Richardson, bureau 1060 | Montréal, Québec Canada H3K 1G6 | opal-rt.com | +1 514-935-2323