Specialised Mining Supplies
 

Local Designs for special requirements
in electrical protection

 Earth Wire Monitor (EWM)
For use on a 3-phase system where there is no Neutral connection.

 (patent  pending)

Rugged unit to monitor earth wire integrity between point of connection and the transformer star point on a 380/525V 3-phase system.

Intended to be installed at load side (e.g. motor)
Resistance measuremen t range: 150 - 500 Ohms
Can also be made for higher voltages and a range of sensitivities and trip delays

Specifications 

 Earth Wire Monitor for electrical protection at the load side

 Earthing Resistance Monitor (ERM)
Works on either a single- or 3-phase system but needs a Neutral connection.

 (patent pending)

Rugged monitoring unit to monitor the electrical resistance between Earth and Neutral.
Runs on 115V ac or as requested.
Resistance measuremen t range: 27 - 200 Ohms
Can be provided for a range of sensitivities and trip delays
Intended to be installed in the substation or minisub

Specifications

 ERM for electrical protection when the Neutral wire is available

 Earth Resistance and Current Monitor (ERCM)

 (patent pending)

One N/O solid state contact for the shunt trip coil, operated by
Resistance of Neutral-Earth Resistor (NER) out of limits

Supply: 110V ac or as requested
Resistance measurement range: 27 - 150 Ohms
Typical Resistance limits: 27Ohms +-15%, typ.delay: 5 sec
Internal watchdog to trip the output on internal failure (0.5 sec)

Values other than those above can be supplied

Specifications

ERCM

 Transformer Watchdog Relay (TWR)

 (patent pending)

One N/O solid state contact for the shunt trip coil, operated by:

- Resistance of Neutral-Earth Resistor (NER) out of limits
- Earth Fault current  in NER exceeding limit
- Any one of 4 inputs activated, from other protection Relays,
  
e.g. Over-temperature, PRV, Buchholz, etc

Supply: 110V ac or as requested
Resistance measurement range: 27 - 150 Ohms
Typical Resistance limits: 27Ohms +-15%, typ.delay: 5 sec
Typical trip delay on Earth Fault current: 100 msec
Trip delay for 110V inputs: 100 msec
Internal watchdog to trip the output on internal failure (0.5 sec)

Values other than those above can be supplied

ERCMT

 ECM

Earth and cable monitor (ERM + Celtifier)
for monitor & control through SMS's using your cellphone.
For detecting copper cable theft or any other damage to Earth or Neutral conductors.

An earth wire problem as detected by the ERM or EWM
 as well as power loss and surge protection operation will be reported by SMS.
Discrete inputs eg. door contacts can also be reported.

Article as published in "Electricity + Control" here

ECM

EPP
Earth path and phase loss Protector
SABS tests

Patent pending

EPP

SVC
Motor start-up Sequence and Vigilance Controller
intended for safety on winch motors, underground motors etc.

SVC

The above and some new product designs are originated and maintained by Mercutech cc


 

ELT 500 & ELT1000

The ELT Adjustable Earth Leakage Tester is designed to simulate a controlled earth fault on systems where Earth Leakage Relays are installed namely mining, industrial and commercial installations.

ELT500 & ELT1000



Protecta range of products

NTSA 

AZT 3/0
Electronic, self-powered overcurrent protection

AZT 3/0

TRIM
Transformer inrush current minimiser

TRIM

PROTEC Z
The Protec Z family is a range of surge suppressors for protection of medium voltage motors, generators and transformers against transient switching surges.

Protec Z HV surge suppressor