产品中心
NDW200 microcomputer integrated protection device series
NDW200 microcomputer integrated protection device series

NDW200 Microcomputer integrated protection device series

Ac current: 5A, 1A
Ac voltage: 100V
Ac frequency: 50HZ
Dc voltage: 220V, 110V
Ac current loop: IN=5A each phase is not greater than 0.5VA
Ac voltage loop: U=UN no more than 0.2VA per phase
Dc power supply circuit: no more than 8W in normal operation
                                        Keep the action no greater than 10W

Product overview

NDW200 series distributed microcomputer protection monitoring device is based on the "one device (one interval) one device" fully decentralized design mode developed on the switch cabinet protection monitoring device.The device case is designed with compact structure, good sealing, anti-interference and strong anti-vibration ability, which can meet the protection and monitoring needs of equipment such as feed-line for voltage classes of 10KV and below.The device can be flexibly configured according to the user's requirements to achieve the best performance price.It mainly includes NDW200-L microcomputer line protection monitoring device, NDW200-PD microcomputer capacitor protection monitoring device, NDW200-E microcomputer motor protection monitoring device, NDW200-PT voltage parallel device and NDW200-MBZT standby power source switching device.Through different Settings, it can be applied to line protection (including incoming line, outgoing line), sectional protection, line transformer group protection (including station, used transformer)

NDW200 series microcomputer protection and automatic device has the following characteristics: 

● Has the complete protection function and in - place monitoring function.According to the needs of users, the communication function can be selected to realize the simple and practical integrated monitoring function.
● High performance, high reliability, high integration of wide temperature military or industrial grade chip;High-precision resistive and capacitive elements;The sealed relay ensures the reliability of the device under high and low temperature conditions.
● Fully enclosed anti-interference unit case, new type backplug structure design, double layer shield, no external bus, reduce the impact of electromagnetic interference.
● According to the reliability requirements of relay protection design monitoring system, improve the overall reliability of the system, in order to truly realize the substation unmanned duty.· Double-position acquisition is adopted for switch remote signaling, which avoids the jitter problem of switch operation remote signaling.
● The device has a perfect self-check function. When the device is found to work improperly, it can lock the outlet reliably to ensure the device does not move by mistake.
● Special clock chip, supported by a separate crystal oscillator, with a spare battery, the clock can go correctly even after the device is off power, so that the device can accurately record all kinds of fault information.
● The internal circuit board adopts the technology of table sticking, and all the components adopt the first-line brand, which ensures the reliability and stability of the device
● The device has three watchdogs, external hardware watchdogs, CPU hardware timer watchdogs and software watchdogs to ensure that the device does not crash under any circumstances.
● The RS485 communication interface with high-speed magnetic isolation technology is stable and reliable. The RS485 communication adopts MODBUSRTU communication protocol and IEC60870-5-1-3 protocol. The communication protocol can be selected by setting.
● The software in the device adopts modular design, with a variety of redundant measures, and through a long time of field operation test, the program runs stably and reliably.
● Full Chinese liquid product display interface, multi-layer menu display, display information rich, friendly human-machine interface, no complex training can be completed debugging work.

NDW200 microcomputer technical parameter

1.Rated data

Ac current: 5A, 1A
Ac voltage: 100V
Ac frequency: 50HZ
Dc voltage: 220V, 110V

2.Power consumption

Ac current loop

IN=5A

No more than 0.5VA per phase

Ac voltage loop

U=UN

No more than 0.2VA per phase

Dc power circuit

The normal work

No more than 8 w

Keep the action

Not more than 10 w

3.Overload capacity

Ac current loop

 

2 times the rated current

Continuous work

10 times the rated current

Allowed to work for 10 seconds

40 times the rated current

Allowed to work for 1s

Ac voltage loop

1.2 times the rated voltage

Continuous work

Dc power circuit

80%~110% rated voltage

Continuous work

4.Measurement error

current

No more than±0.5%

voltage

No more than±0.3%

power

No more than±1%

5.Temperature effect

The variation of operating value caused by temperature change in the normal operating temperature range from -10℃ to 55℃ is no more than ±1%

6.Allow for environmental change

Normal operating temperature

-10℃~55℃

Relative humidity

45%~90%

The atmospheric pressure

80~110Kpa


7.Anti-interference performance

(1) pulse interference test
can withstand the frequency of 1 MHZ and 100 KHZ common-mode voltage amplitude 2500 v, 1000 v differential mode attenuation of shock wave pulse interference test.

(2) Electrostatic discharge immunity test
Can withstand the IEC61000-4-2 standard class I Ⅳ, test voltage 8 kv static contact discharge test.

(3) the radio frequency electromagnetic field radiation immunity test 

Can withstand the IEC61000-4-3 standard Ⅲ, interference field strength 10 v/M of radiation electromagnetic field interference test.

(4) Electrical fast transient pulse group disturbance immunity test
Can withstand the IEC61000-4-4 standard class I Ⅳ transient interference test.

(5) Surge (impact) immunity test
Can withstand the IEC61000-4-5 standard I Ⅳ, open circuit voltage level 4 kv surge interference test.

(6) Interference test of harmonic and interharmonic waves of power supply system and connected equipment
Can meet the IEC610004-7 standard B class, current and voltage of the maximum allowable error not more than 5% of the measured value.

(7) Immunity test for power supply voltage sag, short time interruption and voltage variation
Can withstand iEC61004-11 standard 70% UT class voltage sag, short - time interrupt interference test.

(8) Oscillation wave immunity test
It can withstand the iEC61004-12 standard V class damped oscillation wave interference test, as well as the IV class ringing wave interference test with voltage and amplitude common mode 4KV and differential mode 2KV.

(9) Anti-interference degree of power frequency magnetic field
It can withstand the IEC61000-4-8 standard grade IV continuous power frequency magnetic field interference test.

(10) Anti-interference degree of damped oscillating magnetic field
Can withstand the IEC610004-10 standard Ⅳ level damped oscillation magnetic field interference test.

8.Insulation resistance

Ac input ground: greater than 100 megohm
Dc input to ground: greater than 100 megohm
Signal and output contact to ground: greater than 100 megohm
Open entry return to ground: greater than 100 megohm
It can withstand 2KV/1min power frequency withstand voltage, 5KV impulse voltage

9.Mechanical properties

(1)Vibration
To withstand vibration endurance tests of class I, as specified in 16.3 of GB/T7261

(2)Impact
To withstand impact endurance tests of class I, as specified in 17.5 of GB/T7261

(3)Collision
To withstand a collision test of class I severity as specified in Chapter 18 of GB/T7261

Series microcomputer selection table

The product name

Product model

Protection function

Line protection device

NDW200-L

No time limit overcurrent protection for revoltage blocking, two-stage fixed time overcurrent protection for revoltage blocking, three-stage zero sequence overcurrent protection, three-phase reclosing once, post-acceleration protection, current blocking loss protection, overvoltage protection, overload protection, PT disconnect check, control circuit disconnect check

Station variable (with variable) protection device

NDW200-PB

No time limit overcurrent protection, two-stage fixed time limit overcurrent protection, overload protection, reverse time limit overload protection, zero sequence overcurrent protection, zero sequence overvoltage protection, PT disconnect, overvoltage protection, loss voltage protection, control circuit disconnect, non-electric power protection

Asynchronous motor protection device

NDW200-E

Short circuit protection, over-long start time protection, two-stage fixed-time over-current protection, two-stage load over-current protection, reverse time-limit over-current protection, over-current protection, over-voltage protection, low-voltage protection, zero-sequence over-current protection, zero-sequence over-voltage protection, self-starting function, PT wire breaking monitoring, control loop wire breaking

Capacitor protector

NDW200-PD

Two-phase overcurrent protection, zero-sequence overcurrent protection, unbalanced zero-sequence overcurrent protection, unbalanced zero-sequence overvoltage protection, overvoltage protection, out-of-voltage protection, PT wire breaking monitoring, control circuit wire breaking

Busbar backup self-throwing device

NDW200-MBZT

Feed line I, feed line II, no master mode, reverse feed line I, reverse feed line II

Circuit backup self-throw protection device

NDW200-XLPTB

No time limit overcurrent protection, two-stage fixed time limit overcurrent protection, overload protection, reverse time limit overload protection, zero sequence overcurrent protection, zero sequence overvoltage protection, PT line break, overvoltage protection, loss voltage protection, disconnection backup self-throw, incoming line backup self-throw, reverse backup self-throw

Voltage transformer monitoring and protection device

NDW200-PT

PT automatic parallel and unlink, PT manual parallel and unlink, low voltage protection, grounding protection, PT disconnect check

Transformer protection terminal diagram

ndw200wjzhbhzzxl 3NDW200 shape and hole size

ndw200wjzhbhzzxl 04

Message feedback

News Center

> Return to work in the disease

On February 26, the production of NPOWER Group resumed. The director and manager of our company personall...

> Resistance to disease

This year Spring Festival, the sudden outbreak of the new champions league, brought unprecedented challen...