| Frequency and Voltage Protection
Edison UFD14 Load Shedding Relay
The UFD14 provides four levels of over/under frequency (81) with undervoltage inhibit. In addition two levels of df/dt (rate of change of frequency) elements are provided that can be logically linked to any of the 81 elements.
- Catalog Section 150-21
- Instruction Manual S150-21-1
Edison UFD3 Load Shedding Relay
The UFD3 is a three phase relay that provides four levels of over/under frequency (81), two levels of over/under voltage (27/59), two levels of df/dt and one level of dV/dt (rate of change of voltage) elements.
- Catalog Section 150-20
- Instruction Manual S150-20-1
Edison UM30 Voltage/Frequency Relay
This versatile relay provides 2 levels of over/under frequency, 2 levels of over-excitation (24), 2 levels of over/under r.m.s. voltage, plus positive, negative, and zero sequence overvoltage elements.
- Catalog Section 150-22
- Instruction Manual S150-22-1
Edison UM30SV Vector Jump relay
The UM30SV Vector Jump relay is designed to detect generator islanding
conditions. When a generator and its local load becomes isolated from the
balance of the power system, a step change in sensed frequency occurs. This
so called "vector jump" is a reliable indicator of an islanding condition.
In addition to detecting this phenomena, the other fucntions in the UM30SV
make it an excellent all purpose voltage and frequency relay. Included are
frequency (81), under and over-votlage (27, 59), sequence voltage elements
(27pos, 59pos, 59neg, 59zero), and overexcitation (24).
- Relays Catalog Section 150-23
- Instruction Manual S150-23-1
- Reference Literature R150-23-1
- Reference Literature R150-23-2
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