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Auxiliary relays are used for machine safety. Auxiliary relay assists a protective relay in switch-gear for a number of operations. Protective Relay performs task of measurement and under required conditions, is closes its contacts. Protective relay is relieved of all duties such as tripping, Time lag, breaking of trip circuit current, giving alarm, showing flags, etc. This duties are performed by Auxiliary Relays.Each of these duties are performed by an auxiliary relay.Seal-in Relay, Alarm Relay, Time lag Relay are some of the auxiliary relays.
Contacts of Protective relay are delicate. Seal-in Relay is an auxiliary relay that protects the contacts of Protective relay. Alarm Relay is an auxiliary relay that gives trip alarm(Indication) both in audible and visual form.
Time lag relays are auxiliary relay that operate after a preset time lag. They are used in control and alarm circuits to allow time for the required sequence of operation to take place. This are various applications of auxiliary relay.
These parts are made of 48% Ni:Fe.PML provides these parts with high magnetic properties and critical dimensions maintained for proper working of the auxiliary relay.
A relay is an Electro-Mechanical switch that changes a low release current into mechanical movement. A polarized relay consists of a soft-magnetic circuit formed by an Armature and a Yoke as shown in above fig.
These parts are made in80% NiFe or 48% NiFe material. These parts require very high permeability and the contact area needs to have very high surface finish, flatness and cleanliness.These parts are
used in Earth Circuit Leakage Breakers (ELCB) or Residual Current Devices (RCDs) for Human Safety.
| Magnetic & Chemical Properties | ||||||
|---|---|---|---|---|---|---|
| Permeability | Properties | 80% NiFe(7) | 48% NiFe(8) | |||
| Permeability DC | ||||||
| Bs (Tesla) | 0.75(1) | 1.5(3) | ||||
| Br (Tesla) | 0.4(2) | 1.1(3) | ||||
| Hc(2)(A.m-1) | 0.35 | 2.8 | ||||
| μ4(4) | 550000 | - | ||||
| μmax | 570000 | 190000 | ||||
| Permeability AC | ||||||
| μ4z(5) | 70000 | 10400 | ||||
| μz8(6) | - | 54000 | ||||
| μmax | 95000 | - | ||||
| Core Loss (W.Kg-1) | 0.015 | 0.4 | ||||
| Chemical Composition |
% Ni | 78%-81% | 47%-48% | |||
| % Mo | 4.5%-6% | Nil | ||||
| % Si | 0.05%-0.4% | 0.1 | ||||
| % Mn | 0% -0.5% | 0.50% | ||||
| % C | 0.01% | 0.005% | ||||
| % Fe | Balance | Balance | ||||
| Contact Load | |||
|---|---|---|---|
| Model | R103 | R103 | R103 |
| Rated Ioad (resistive) | 60A / 250V | 80A / 250V | 100A / 250V |
| Max switching current | 60A | 80A | 100A |
| Max switching voltage | 250VAC | 250VAC | 250VAC |
| Max switching power | 15,000VA | 20,000VA | 25,000VA |
| Performance Parameter | ||
|---|---|---|
| Contact Material | Silver alloy | |
| Contact resistance | 1mΩ Max. | |
| Operating time | 20ms Max. | |
| Releasing time | 20ms Max. | |
| Insulation resistance | 10000MΩ Min. (DC500A) | |
| Dielectric strength | Across open contacts | 2000 Vac for 1min. |
| Coil to contact | 4000 Vac for 1min. | |
| Vibration | Functional | 10~55Hz, double amplitude 0.5mm |
| Shock resistance | Destructive | 10~55Hz, double amplitude 0.5mm |
| Functional | 10g Min. | |
| Life / Endurance | Mechanical | 100,000 cycles |
| Electrical | 10,000 cycles | |
| Operating temp range | -40˚C~ +70˚C | - |
| Coil Parameter (20˚C) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Rated Voltage (VDC) | Rated Current ±10%(mA) | Resistance ±10%(Ω) | Operating Voltage (Max.) |
Releasing Voltage (Max.) |
Pulse Width (ms) |
Rated Power |
||
| Single Coil | Double Coil | Single Coil | Double Coil | |||||
| 5 | 200 | 400 | 25 | 12.5 | 70% Rated Voltage | 70% Rated Voltage | 100 Min. | Single/ Double 1W/ 2W |
| 6 | 167 | 334 | 36 | 18 | ||||
| 9 | 111 | 222 | 81 | 40.5 | ||||
| 12 | 83 | 167 | 144 | 72 | ||||
| 24 | 72 | 83 | 576 | 288 | ||||
| 48 | 21 | 42 | 2304 | 1152 | ||||
