MAT Automatic Insulation Resistance Monitoring System
MAT is a patented motor testing and protection system designed to monitor winding insulation breakdown in critical duty motors. HZ electric has created a patented, automatic, in-line insulation resistance tester and monitor with test capabilities from 500 to 5000 VDC. Downtime and maintenance costs are reduced as critical motors are pulled out of production as part of a preventive maintenance program rather than after a catastrophic failure. Personnel safety is improved and adherence to a preventive maintenance schedule enhanced as MAT testing is conducted automatically rather than manually. In effect, MAT provides the peace of mind that comes from meg ohm testing the motor windings before every start.
The MAT applies a current limited, fixed D.C. voltage to the windings of the motor when it is idle. It measures the leakage current to ground, which is monitored by a solid state comparator circuit. The comparator has the capability of providing two adjustable set points which are preset at the factory to customer specifications. When the set points are exceeded the MAT can be programmed to first send a signal (pre-alarm) and then followed by locking out the equipment from being operated (optional). The device is equipped with a remote LED display and switch assembly which allows the unit to be monitored and operated from the low voltage panel, for added personnel safety. The color coded meter indicator also makes it easy to determine the exact condition of the winding insulation. The MAT is safe and reliable and will not impair the normal operation of the equipment being monitored.
| Model | MAT5000 | MAT500 |
| Monitoring objects | 4160...7200V motors | 380V motors |
| Work power | 115...265Vac,50/60Hz,0.15Amax. | 115...265Vac, 50/60Hz, 0.05Amax. |
| Test voltage | 5000Vdc@350μAmax. | 500Vdc@200μAmax. |
| Highest working voltage | 7200Vrms (Opt. 13.8kV) | 600Vrms |
| Warning relay | 5A@240Vac or 28Vdc,C-relay | 5A@240Vac or 28Vdc,C-relay |
| Alarm/latching relays | 5A@240Vac or 28Vdc,C-relay | 5A@240Vac or 28Vdc,1 NC-relay |
| Instrument | 1% megohm meter | NA |
| LED display | Power supply: green, test: yellow, warning: yellow (flash), alarm: red (flash) | Test: green, alarm: red (flash) |
| Control precision | 1%(full range) | 2%(full range) |
| Working temperature | -10℃ ... +60℃ | |
| Shape dimension | H 292 × W 95 × D 241 mm | H 70 × W 57 × D 114 mm |
| weight | 3.4kg | 0.45kg |
| Application standards | UL 508 standard | |
Utilities.
Dave Mesquita, Maintenance Manager, Southern California Generation Plant.
A year ago we installed (28) MAT5000 units on critical 4160 V motors and MAT500 units protecting (59) critical 480 V motors in our plant. To date we have already identified (2) 4160 V motors and (2) 480 volt motors with ground issues and were able to prevent them from failure. These systems work, they save the company money, and the minimize forced outages. We are very pleased with all the benefits and added plant safety they provide to our facility.
Oil Industry
Shell Offshore
Samuel Torres, Electrician, Shell Offshore -Perdido Platform
We have installed your MAT systems on our (6) main turbine generators on the Shell Perdido platform, operating in 8000 feet of water off the Gulf of Mexico. Since the units were installed almost two years ago they have saved us countless man hours with the automatic testing capabilities and have allowed us to prevent several generators from failing on start up. We are using these units on several of our other platforms in the Gulf with the same success.