12V DC Voltage Monitoring Relay DIN Rail Mounting with Normai / Trip Indicators
What is over voltage
Overvoltage refers to the long-term voltage fluctuation phenomenon when the rms voltage of the AC voltage rises above the rated value and exceeds the rated value for more than 1 minute. The overvoltage is usually the result of the load switching. For example: Cut off a large capacity load or energize the capacitor bank (overvoltage caused by excess reactive power compensation).
The abnormal voltage that exceeds the working voltage in the power system under certain conditions rises, which is an electromagnetic disturbance phenomenon in the power system. The insulation of electrical equipment withstands the operating voltage for a long time, and must also be able to withstand a certain degree of overvoltage, so as to ensure the safe and reliable operation of the power system. Studying the causes of various overvoltages, predicting their amplitudes, and taking measures to restrict them are the preconditions for determining the insulation coordination of power systems, and are of great significance for the manufacture of electrical equipment and the operation of power systems.
Abrupt changes in the state of the circuit and the electromagnetic state in the power system are the root cause of overvoltage generation. Overvoltage is divided into two categories of external overvoltage and internal overvoltage. Studying the causes of various overvoltages in power systems, predicting their amplitudes, and taking measures to limit them are prerequisites for determining the insulation coordination of power systems, and are of great significance for the manufacture of electrical equipment and the operation of power systems.
Regardless of the external overvoltage or internal overvoltage, it is affected by many random factors. It is necessary to combine the specific conditions of the power system, obtain data through various methods such as calculation, simulation and field measurement, and use probabilistic statistical methods to predict overvoltage.
For the cause of over-voltage, the power system must take protective measures to limit the over-voltage amplitude. Such as the installation of lightning protection lines, lightning arresters, reactors, switch contacts plus parallel resistance, etc., in order to reasonably implement insulation coordination to ensure the safe operation of the power system.
Descirbution of DC Voltage monitoring relay
-- Compact modular size
-- DC circuit monitoring of over- and undervoltage
-- Adjustable over- and undervoltage threshold
-- Adjustable trip delay time
-- Powered by the measuring circuit
-- 2 C/O contacts
-- 2 LEDs for status indication
• DC cabinet • Battery
• Electric control system
♦ Technical data
|Measuring circuit||DC circuit|
|Monitoring functions||overvoltage, undervoltage|
|Voltage setting range|
|Trip delay time||0.1-15s adjustable|
|Output contacts||2 C/O|
|Contact capacity||6A ,250VAC|
|Dimensions (H x W x D)||79×23×79mm|