The transformer has poor load capacity. For example, the enameled wire used in the secondary of the transformer is thin, the internal EBW shunt resistor
of the transformer is large, and the voltage drop of the transformer is large when the output current is large. The power margin of the transformer is not large, the capacity of the filter and energy storage capacitors is small, and the short-term output capacity is insufficient; the performance of the transformer changes greatly in the high temperature environment, and the output capacity decreases greatly; the output voltage of the transformer is low, and it can be driven normally at room temperature. When the relay works, when the surrounding temperature rises: the operating voltage of the relay will increase to a certain extent, and the output voltage of the transformer will become lower, and the relay cannot be closed or disconnected normally; the voltage pulse applied to the relay coil is too narrow or the distributed capacitance is distorted or leakage current.GRT508B RoHS compliant 90A Single-phase Relay
-90A contact switching capability.
-Only impulse excitation needed, both for single and double coil.
-Low power consumption with great load capability, small in size.
-Custom assemblies available with flexible wire and/or copper straps, and/or with integrated shunt.
-4KV dielectric strength between coil and contacts
-Outline dimensions: (38.5 x 30 x 17.5/16.5)mm
It is recommended that when the voltage applied to the relay coil is lower than the rated value, the pulse width can be appropriately increased; the solder joints of the coil leads on the printed board should be cleaned and sprayed with insulating paint for protection. Do not move the relay pins forcibly to prevent deformation and internal parameter changes. Both terminals of the relay are hard-connected products. The screws on the two terminals should be screwed in first and then tightened with tools. Otherwise, the relay may be easily damaged. Do not open the relay cover without permission. Improper operation will cause changes in the performance parameters of the relay and foreign matter. immersion, causing relay failure.
When the installation height of the relay is inconsistent with the terminal post of the case, do not correct it by yourself, but return it to the manufacturer.When using an electric soldering iron, the power of the electric soldering iron should be ≤60W; the welding time should be ≤2S. When using the fixing parts to fix the relay, the material of the fixing parts should not be made of iron, and the fixing parts should not have a large extrusion effect on the relay. Pull, pull the sampling wire or take and lift the relay through the sampling wire. When three-phase electric energy meter uses built-in relay, the three-phase relay should be preferred, and the voltage applied to the coil of the magnetic latching relay is allowed to be 200% of the rated voltage for a short time.
The brush wire is woven from multiple strands of thin copper wire, and its length is affected by the tightness. influences. In order to prevent premature aging, failure and parameter changes of internal parts of the relay. Suggestion: The electric energy meter should add the passing current limiting function and temperature protection function. When the passing current and the temperature in the meter exceed the allowable value and allowable time, cut off the circuit to ensure the safety and reliability of the electric energy meter.