CKPM301 uses single chip system, its CPU contains
the parts of microprocessor-based resource, such as FLASH ROM,RAM, EEPROM, AD
converter, timer, serial port, etc. Due to all connections with the external
device is implemented by I/O ports and use various measures for isolation, so CKPM301
can use fewer components, work more stably and with strong anti-interference
has all-metal construction, with simple & rationalization design, and the
panel is made of aluminum material with one-step casting. What is more, its
depth is just 80mm which is tiny and space-saving for installation.
voltage and low voltage components are strictly separated by the hardware
The low voltage
parts are installed on the mainboard and all signal lines is shielded by
earthing line。 The high voltage parts are installed on the base plate, with short
cable routing and wide spacing。 The withstand voltage of all external wiring
terminal can reach 4000V, excepting for the power terminal which can reach
all external connecting parts adopt isolating treatment
input / output goes through by photoelectric isolation, analog goes through by
transformer isolation, tripping output and signal output go through by relay
isolation, which can minimize the interference from input/output 。
below parts adopts shielding method to prevent high-frequency interference.
parts of analog via transformer
parts of switch power
below parts uses the specialized components to prevent EFT interference, which
makes CKPM301 has the excellent performance to prevent transient interference.
can keep accurate time more than 10 years even if CKPM301 lose power, because
it has spare battery and crystal oscillator inside the clock chip. What is
more, as the promise from the clock chip supplier, its annual error won’t
exceed 2mins, so it can solve the unpunctual problem when CKPM301 works
individually and make accurate record for fault message.
core of the CT is made of special material, so the CT can’t easily to get
saturation state even if the fault current is at high value。 Meanwhile, due to
the high-precision CT, the action of CKPM301 can be more accurate and has
tripping relay and signal relay uses high-power electromagnetic relay
capacity can be 12A, its withstand voltage between contact and coil can be
5000v, and its action time just need 7ms。 Tripping relay can directly act on
circuit breaker tripping, and signal contact can drive audible and visual alarm
control circuit with monitoring function
tripping circuit or closing circuit of circuit breaker disconnects, CKPM301
will send out warning signal in time. The monitoring circuit can operate by
direct power or alternating power; what is more, it is no need to add any
components or isolating measure by outside.
below parts can connect with CKPM301 directly, and it will display the
corresponding fault information after adopting the protecting action.
temperature protection / over temperature protection of dry-type transformer
gas protection / heavy gas protection / temperature protection of oil immersed
power operation / alternating power operation
/ 220V power
input voltage for power module
can not only use for 110V or 220V voltage, but also for direct current power or
alternating current power。
CKPM301 includes external hardware watchdog, CPU hardware watchdog
timer and software watchdog. As different watchdogs can monitor each other very
well, which make the protection relay won’t crash in any case.
LCD display and utility menu operation, it is very conveniently to use and
indication and record function
high capacity NVSRAM is equipped inside CKPM301, it can maximum to record 120
fault messages including time and current value with first-in first-out
with module design
protecting module with definite time shares program code, all important program
segments has multiple redundant back measures and with long-term field
operation test, so the program can work stably and reliability.
is equipped with stable RS485 communication interface, which adopts international
protocol Modbus IEC870-5-101, IEC870-5-103. It can communicate all messages to