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NDW20 series distributed microcomputer protection monitoring device
NDW20 series distributed microcomputer protection monitoring device
NDW20 series distributed microcomputer protection monitoring device
NDW20 series distributed microcomputer protection monitoring device

NDW20 Series distributed microcomputer protection monitoring device

AC current: 5A、1A
AC voltage: 100V
Ac frequency: 50HZ
Dc voltage: 220V、110V
Ac current loop: IN=5A/phase no more than 0.5VA
Ac voltage loop: U=UN no more than 0.2VA per phase
Dc power supply circuit should work normally no more than 8W
The protection action shall not be greater than 10W

Summarize

NDW20 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 NDW20-L microcomputer line protection and monitoring device, NDW20-PD microcomputer capacitor protection and monitoring device, microcomputer motor protection and monitoring device, voltage parallel device and standby power source switching device.Among them, microcomputer line protection monitoring device, through different Settings, can be applied to line protection (including incoming line, outgoing line), section protection, line transformer group protection (including station, used variation).

NDW20 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.
● Switch remote signal adopts dual position acquisition to avoid the jitter of switch operation remote signal.
● 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 will not crash under any circumstances.
● The RS485 communication interface and CAN communication interface with high-speed magnetic isolation technology are stable and reliable. The RS485 communication protocol is modBUS-RTU protocol, which CAN be selected by setting, and CAN communication interface is IEC60870-5-104 protocol.
● 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.
● The use of Chinese LCD interface, multi-layer menu display, display information rich, friendly human-machine interface, no complex training can be completed debugging.

Technical parameters

2.1 Rated data

AC current          5A、1A
AC voltage         100V
Ac frequency      50HZ
Dc voltage          220V、110V

2.2 Power consumption

Ac current loop IN=5A/phase no more than 0.5VA
Ac voltage loop U=UN no more than 0.2VA per phase
Dc power supply circuit should work normally no more than 8W
The protection action shall not be greater than 10W       

2.3 Overload capacity

Ac current loop: 2 times rated current continuous operation
10 times the rated current is allowed to operate for 10S
40 times the rated current is allowed to operate for 1S
Ac voltage loop: 1.2 times rated voltage continuous operation
Dc power supply circuit: 80% ~ 110% rated voltage continuous operation

2.4 Measurement Error

The current should not be greater than ±0.5%
Voltage not greater than ±0.3%
Power not greater than ±1.0 %

2.5 Temperature influence

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

2.6 Permitted environmental conditions

Normal working temperature -10℃ ~ 55℃
Relative humidity 45% ~ 90%
Atmospheric pressure 80 ~ 110kPa

2.7 Anti-interference performance

⑴  pulse interference test
It can withstand the attenuation shock wave pulse interference test with the voltage amplitude of 1MHZ and 100KHZ at a common mode of 2500V and differential mode of 1000V.

⑵  The electrostatic discharge reactance test
Can withstand the Ⅳ IEC61000-4-2 standard, test voltage 8 kv static contact discharge test.

⑶  Radiofrequency 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.

⑷  Electrical fast transient pulse group immunity test
Can withstand the IEC61000-4-4 standard Ⅳ transient interference test.

⑸  surge (impact) disturbance resistance test
Can withstand the IEC61000-4-5 standard Ⅳ, open circuit test voltage level 4 kv surge interference test.

⑹  power supply system and connected equipment harmonic, harmonic wave interference test
Can meet the IEC61000-4-7 standard B class, current and voltage of the maximum allowable error not more than 5% of the measured value.

⑺  For power voltage sag, short - term interruption and voltage variation
Can withstand iEC61000-4-11 standard 70% UT class voltage sag, short - time interrupt interference test.

⑻  Therefore, oscillation wave immunity test
Can withstand the IEC61000-4-12 standard Ⅳ level damped oscillation wave interference test, as well as the common mode voltage amplitude 4 kv, differential mode 2 kv Ⅳ ringing wave interference test.

⑼  Interference resistance of power frequency magnetic field
Can withstand the IEC61000-4-8 standard Ⅳ continuous power frequency magnetic field interference test.

⑽  We will damp the interference resistance of oscillating magnetic field
Can withstand the IEC61000-4-10 standard Ⅳ level damped oscillation magnetic field interference test.

2.8 Insulation resistance performance

Ac input to 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 circuit to ground: greater than 100 megohm
It can withstand 2KV/1min power frequency withstand voltage, 5KV impulse voltage

2.9 Mechanical properties

⑴  vibration
To withstand vibration endurance tests of class I, as specified in 16.3 of GB/T 7261

⑵  the impact
To withstand impact endurance tests of class I, as specified in 17.5 of GB/T 7261

⑶  the collision
To withstand a collision test of class I severity as specified in Chapter 18 of GB/T 7261

NDW20 microcomputer series selection table

The product name

Product model

Protection function

Line protection device

NDW20-L

No-time-limit overcurrent protection for revoltage lock, two-stage fixed-time-limit overcurrent protection for revoltage lock, three-stage zero-sequence overcurrent protection, three-phase one-time overlapping lotuses, back-accelerating protection, current-loss protection for revoltage lock, overvoltage protection, overload protection, PT disconnection detection

Station variable (with variable) protection device

NDW20-PB

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

Asynchronous motor protection device

NDW20-E

Short circuit protection, over-long start time protection, two-stage fixed-time over-current protection, two-stage negative sequence over-current protection, reverse time-limit over-current protection, overheat protection, over-voltage protection, low-voltage protection, zero-sequence over-current protection, zero-sequence over-voltage protection, self-start function, PT disconnection monitoring

Capacitor protector

NDW20-PD

Two-phase over-current protection, zero-sequence over-current protection, unbalanced zero-sequence over-voltage protection, unbalanced zero-sequence over-voltage protection, over-voltage protection, out-of-voltage protection, PT wire breaking monitoring

Busbar backup self-throwing device

NDW20-MBZT

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

Circuit backup self-throw protection device

NDW20-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 detection protection

NDW20-PT

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

NDW20-PB Transformer Protection Terminal Diagram

ndw20wjzhbhzzxl 05

P1

terminal

1

2

3

4

5

6

7

8

Power supply

+/L

Power supply

-/N

Earthing terminal

Signal common end

Circuit breaker alignment

The distance of remote control

Spring unstored energy

Heavy gas

9

10

11

12

13

14

15

16

Light gas

overtemperature

High temperature

Spare open in 1

ndw20wjzhbhzzxl 08

ndw20wjzhbhzzxl 08

Closing the export

Break-brake export

17

18

19

20

21

22

 

ndw20wjzhbhzzxl 08

ndw20wjzhbhzzxl 08

485A

485B

The accident export

The alarm export

21

22

 

Computer profile and hole size

ndw20wjzhbhzzxl 06

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