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| Product Range |
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| Product Range Relays |
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Micro Controller Based Current Sensing Motor Protection Relay
Without Display
WOD
WOD-TUA
With Digital Display
EC (Door Mount)
S-EC (DIN Rail Mount)
DXA (Door Mount)
S-DXA (DIN Rail Mount)
Intelligent Relay
i.MWPD (DIN Rail Mount)
i.MWPD-IO (DIN Rail Mount)
i.MWPD-H (DIN Rail Mount)
Micro Controller Based Voltage Sensing Protection Relay
Without Display
WOD-VPD
With Digital Display
VPD (Door Mount)
S-VPD (DIN Rail Mount)
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Ground Fault Protection Relay |
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We provide Earth Fault (Ground Fault) Protection through Core Balance Current Transformer (CBCT). Core Balance CTs are specially design CTs used to detect Earth faults & usually used for Restricted Earth Fault Protection.
It is a ring type CT through which the cables carrying current of all the three phases (R-Y- B) are passed through. (In a 3phase 3 wire system) Under normal operating conditions, summation of current through the three phases shall be equal to zero. In event of a fault, the summation of the current shall no longer remain zero (zero sequence current shall flow during earth fault) & thus the fault can be detected.
- Earth Fault Protection with Annunciation (Visual) (Settable).
- Settable Earth Fault Current from 0.1 A to 25.0 A.Available ID for CBCT : 60mm/80mm/100mm/150mm/200mm
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| Microprocessor Based Motor Protection Relays |
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We supply a very wide range of Microprocessor based Motor Protection Relays. Thermal Overload Relay is expected to protect motor mainly against single phasing faults & overloading faults. In both cases have serious limitations.
Major causes for motor burning
• Phase Failure
• Overloading
Phase Failure:
The condition occur due to fuse failure, loose of connection, loss of phase supply, or the phase line's becoming dead etc. In this case the motor continues to run the remaining two phases, drawing heavy current through remaining two winding, which leads motor burnt out.
In case of phase failure the phase that has failed. Sometimes this back emf can be equivalent to input supply voltage. A voltage sensing relay or device predicts it as healthy condition& will not trip the motor that will continue to run on two phase. But in current sensing relay it is not affected. Under phase failure condition current in the phase that has failed, goes to zero & thus current sensing relay detects phase failure.
Moreover voltage sensing relay will more to get faulty as they have to take three phase voltage into their electronic circuit for sensing & hence all the spares, surges & fluctuations of supply affect life of its sensing circuit components. In case of current sensing relays the electronic circuit senses very low voltage current signals coming out from output of CTs & hence it sensing circuit components operate in safe supply conditions.
Overloading:
This condition may occur due to phase failure or direct overloading of motor. It causes increases in the current beyond rated current of motor. So heat produces inside the winding, causes damaging to the insulation of winding in turn burning of motor.
In majority of cases as a conventional method, bi-metallic relay is used for protection of the motor. However these bi-metallic relays have proved their unreliability & incapability of providing precise protection in electrical applications. Thermal overload relays with built in single phasing protection are expected to protect the motor against,
1) Single Phasing Faults
2) Overloading Faults
On both these accounts, it has serious limitations.
Since Bi-Metal relay employ electro-mechanical construction & need the bi-metal to be heated up before it actuates so it takes longer time for tripping.
Due to many moving parts, Bi-Metal relay will have more wear & tear compared to Electronic /Micro Controller based relay.
So, Microprocessor based Motor Protection relay is very economical in comparison with thermal overload relays, if it saves the motor failure just for once, the cost of it is recovered.
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| Single Phase Protection Relay |
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During single phasing condition remaining two phases draw more currents (2-4 times of normal full load current). This is sensed as overload condition by Bi-Metallic Relay & it trips as per time proportionate to percentage of overload current. These currents are maximum at 100% loading hence relay has minimum tripping time delay, which is around 8-12 seconds.
But if single phasing occur during partial loading condition, Bi-Metallic Relay will have longer tripping time.
"If motor loading is below 57% Bi-Metallic Relay will not trip if single phasing occurs."
Single Phasing Protection of Micro Controller Relay is independent of loading conditions. This is most important because motor needs to be protected against single phasing faults at all loading conditions.
The operation of Micro Controller based motor protection relays are not hampered by frequency of operations or operating temperature. As against this, the working of thermal relays changes with these conditions.
In Micro Controller based Motor Protection tripping time is very fast & accurate, but in case of thermal overload relay it is slow & due to that wide band accuracy is very poor.
Application
Any type of Three Phase Induction Motor uses for Blowers, Fans, Pumps, Conveyors, Air Compressors, Agitators, Mixers, Centrifuging Machine, Hoist, Crane etc.
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| Reverse Phase Protective Relays |
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Phase reversal in a three phase induction motor can be dangerous when the opposite direction not allow in certain applications like Non reversing gear box, Screw Compressors, Certain Specialized Pumps, Blower fan etc. In certain cases it hazards to operating personnel. Phase reversal in a motor feeder produces a negative sequence of nearly 100% and is well detected by a relay with negative sequence / Phase Reverse protection. Considering the above details, it can be easily concluded that a motor protection relay will provide an effective protection to the motor only when it is equipped to measure the negative sequence component level in the motor feeder. Our Micro Controller based Motor Protection Device provides such protection. The same feature can be made disable when relay is used for Crane, Hoist or any other application when Motor rotates in Forward & Reverse both direction.
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| Motor Protection Relays |
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We offer Micro Controller based Motor Protection Relays, which is an advanced computerized three phase current protection device. These motor protection relays find application in various industries such as Process Plants, Steel, Cement, Power Plant, Engineering, Automobile, Textiles and many more.
Advanced Computerized Three Phase Current Protection Device.
MMI (Man Machine Interface) with Key Board & Display.
Password protection.
Wide Range. (0.25-5 A / 4-61 A / 40-500 A / 400-1200 A)
In-built Phase CT in 0.25-5 A & 4-61A Range.
External Phase CT with Selectable CT Ratio in 40-500 A & 400-2000 A.
Three Phase Current Display with auto scrolling (Settable).
Selectable Scrolling Time -1 Sec to 10 Seconds.
Accurate Overload Protection with Annunciation (Visual) (Settable).
Selectable I-T Curve (2C, 5C, 10C, 15C & 20C). OR
Selectable Definite Time -2 to 900 Seconds.
Accurate Under Current Protection with Annunciation (Visual) (Settable).
Selectable Under Current Time - 6 to 30 Seconds.
Current Based Single Phase Loss Protection with Annunciation. (Visual) (Settable).
Selectable Single Phase Loss Protection Time - 3 to 20 Sec.
Locked Rotor Protection with Annunciation (Visual) (Settable).
Settable Locked Rotor Range. 4 to 10 Times of Set Current.
Earth Fault Protection with Annunciation (Visual) (Settable).
Settable Earth Fault Current from 0.1 A to 25.0 A.
Current Based Phase Reversal Protection with Annunciation (Visual).
4-20mA Output (Optional)
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| Submersible Pump Protection Relay |
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We offer Micro Controller based Motor Protection Relays which provides very high precision device for Submersible bore water pumps or any other similar pump application.Submersible pump should not operate in Dry Run (No Load) condition for its better performance and longer life cycle. In Micro Controller based Motor Protection Relay supply by us covers Under Load (Dry Run) Protection. By which pump life can increase as well as energy saving due to un necessary ON time of the pump can be control.Another important factor for pump protection is to save it from abnormal overloading occur due to Mud, sludge or any heavy particles enter in to pump, which damage /reduce life of impeller. Our Micro Controller based Motor Protection device has Locked Rotor feature, which is very useful to control the Motor Current in case of instantaneous Over current due to such jamming in impeller.Earth fault is also equally important feature for relay used for protection of Submersible pump as the whole pump with motor is placed in water, & any leakage in motor due to seal problem can damage the motor as well as switchgear has to be replace in certain cases. Our CBCT based Earth Fault is the right solution to avoid such accidents.
Locked Rotor Protection with Annunciation (Visual) (Settable).
Settable Locked Rotor Range. 4 to 10 Times of Set Current.
Earth Fault Protection with Annunciation (Visual) (Settable).
Settable Earth Fault Current from 0.1 A to 25.0 A.
Current Based Phase Reversal Protection with Annunciation (Visual).
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