Over Voltage Three Phase Voltage Monitoring Relay With Timer And
Counter
The voltage phase sequence protector (voltage monitor) is used to
protect the voltage from the wrong phase (fault recognition
protection, automatic phase sequence troubleshooting), phase
failure, overvoltage, undervoltage, voltage unbalance and some
products ZHRV1 can be added PTC temperature protection and load
side protection function, with self-reset and test function
protector.
Phase failure: refers to the fact that the order of the phases is
not in the correct order of the zero value of the alternating
current from the negative value to the positive value.
Phase failure: Phase failure is a phenomenon in which one or more
phases in the loop are disconnected, but not all phases lose
voltage and no current. Or a phase voltage less than 60% of the
rated voltage;
Overvoltage: The voltage (Umax-Ue)/Ue*100% exceeding the
equilibrium potential of the electrode required for the discharge
of ions on the electrode;
Undervoltage: The voltage required for ions to discharge on the
electrode is lower than the equilibrium potential of the electrode
(Umin-Ue)/Ue*100%;
Voltage unbalance: Indicates the difference in amplitude between
three-phase voltages, or the phase shift from the normal voltage
phase difference, or both; commonly used negative-sequence voltage
or zero-sequence voltage and positive-sequence voltage The
percentage of the ratio indicates the degree of voltage imbalance
refers to the maximum or minimum voltage voltage deviation rate
from the voltage average.
♦ Features
-- Compact modular 43mm housing
-- Microprocessor technology provides highly accurate and
repeatable protection
-- Built-in LCD and keypad afford a precise digital setting
-- Adjustable over- and undervoltage,phase unbalance threshold
-- Independent adjustable delay time for overvoltage, undervoltage,
voltage unbalance,
phase loss and phase sequence
-- Adjustable reset method:automatic reset or manual reset
-- Start delay(power-on delay)
-- Test trip with test button
-- 1 NO & 1CO contacts
-- with Timer and Counter for runing and faults
♦ Protective Function
-- Phase sequence
-- Phase loss
-- Overvoltage
-- Undervoltage
-- Voltage unbalance
-- Timer and Counter
♦ Typical Applications
● Pumps ● Fans ● Refrigeration Units
● Blowers ● Motors ● Compressors
● Lifts,Elevators ● Cranes
● Mining excavators and conveyors
♦ Typical Applications
| Model | JVR800-2 |
| Measuring circuit | L1,L2,L3 |
| Rated voltage | 208~480VAC,50/60Hz |
| Monitoring functions | phase sequence, phase loss, overvolatege, undervoltage,voltage
unbalance, timer, counter |
| Overvoltage setting range | 200-600V |
| Undervoltage setting range | 150-500V |
| Voltage hysteresis | 1-20V |
| Delay time for overvoltage and undervoltage | 0.1-30s |
| voltage unbalance ratio | 1-50% |
| voltage unbalance hysteresis | 1-10% |
| voltage unbalance delay time | 0.1-30s |
| Delay time for phase loss | 0.1-30s |
| Delay time for phase sequence | 0.1-30s |
| Start delay time | 0-999s |
| Auto reset mode | ON/OFF |
| Auto reset time | 0.1-999s |
| Timer and counter input | AC/DC 80-450V |
| Indicators | LCD indicating voltage,current,operation status |
| Output contacts | 1 C/O,1NC |
| Contact capacity | 6A ,250VAC |
| Dimensions (H x W x D) | 80×43×54mm |
| Mounting | DIN rail |
