Busbar Protection NSR-371

Distribution terminal is an important component of distribution automation. It is a general term for all types of devices installed in medium voltage distribution network and used for remote monitoring and control. There are generally three types of distribution terminals, i.e. Distribution Terminal Unit (DTU), Feeder Terminal Unit (FTU), Fault Detector, Fault Locator, etc. PDZ800 series intelligent distribution terminals suit the situation of distribution automation system in China and can meet the actual needs of distribution grid transformation in both urban and rural areas. Distribution terminals adopt distributed and modularized design and are equipped with highly reliable measuring and control lines and high speed bus network with strong anti-interference capability. 

  • Overview
  • Features
  • Specification

ANSI

FUNCTION

50BF

Bus coupler failure protection

51P/G

Bus coupler charge overcurrent protection[Phase, Ground]

51/62EF

Bus coupler dead zone protection

51/62PD

BS/BC pole disagreement protection

87BB

Busbar differential protection

FR

Fault Record

  • High-performance hardware platform and modularized design, fault detector AD element + protection AD element. Fault detector element manages fault detector AD element and protection AD element manages protection calculation. Their data acquisition system is completely independent in circuit. DC power supply of output relay is controlled by the operation of fault detector element, which prevents maloperation due to error from ADC or damage of any apparatus.
  • Adopt intelligent design, amount of input and output modules and module slot position are configurable. User can increase or decrease the amount of AC input module, binary input module and binary output module, and terminals of those modules can be defined according to actual requirement.
  • Boasting high-speed 40-point sampling per cycle and real-time parallel calculation. All the protection logic measurement & calculation could be done within one sampling period, as well as the real-time process of fault reports and event recordings.
  • The device comprises the fully enclosed case and the modules. The module is designed in term of weak electric isolated from strong electric. This design improves the capacity against electromagnetic interference, and complies with the European Commission Directive and International Electrotechnical Commission on EMC.
  • The typical trip time for differential protection is less than 15ms (two times of differential current value).
  • Improved CT anti-saturation criterion, strong anti-saturation capability during external fault close to the busbar,quickly trip the busbar internal fault even if in the extreme case of evolving busbar internal fault on the same phase after CT saturation during external fault.
  • The differential properties can be adjusted automatically according to the transient process with consideration of the sensitivity of high outflow current and reliability of CT saturation. The differential properties can be adjusted automatically according to the transient process with consideration of the sensitivity of high outflow current and reliability of CT saturation.
  • The method of zero-crossing differential current and uninterruptible features differential current can recognize the differential current because of slow delay current when removing fault, to avoid misoperation in the case of external fault removal.
  • According to the characteristics of differential current and fault-phase current, avoid misoperation in the case of external fault when non-fault phase CT saturation.
  • Powerful VICT tool can fulfill protection configuration, modify settings and transfer fault record.

l  AC Current Input

Rated frequency

50Hz, 60Hz

Rated current(In)

1A

5A

Linear to

Linear to 0.05In~40In (It should measure current without beyond full scale against 20 times of related current and value of DC offset by 100%.)

Number

Up to 20 current inputs according to various applications


l  AC Voltage Input

Nominal Frequency(fn)

50Hz,60Hz

Rated voltage(Un)

100V~130V

Linear to

1V~170V

Number

Up to 16 voltage inputs according to various applications


l  Power Supply

Standard

IEC 60255-11:2008

Rated voltage

110Vdc/125Vdc/220Vdc/250Vdc

Permissible voltage range

88~300Vdc


l  Binary Input

Rated voltage

24Vdc

48Vdc

Rated current drain

1.2mA

2.4mA

On value

16.8-28.8Vdc

33.6-57.6Vdc

Off value

<12Vdc

<24Vdc

Maximum permissible voltage

100Vdc

Withstand voltage

2000Vac,2800Vdc (continuously )

Response time for logic input

≤1ms

Number

Up to 23 binary inputs according to various hardware configurations


Rated voltage

110Vdc

125Vdc

220Vdc

250Vdc

Rated current drain

1.1mA

1.25mA

2.2mA

2.5mA

On value

77~132Vdc

87.5~150Vdc

154~264Vdc

175~300Vdc

Off value

<55Vdc

<62.5Vdc

<110Vdc

<125Vdc

Maximum permissible voltage

300Vdc

Withstand voltage

2000Vac, 2800Vdc (continuously )

Response time for logic input

≤1ms

Number

Up to 23 binary inputs according to various hardware configurations


l  Binary Output

(1)  Tripping/signaling contact

Output mode

Potential free contact

Continuous carry

8A@380Vac

8A@250Vdc

8A@125Vdc

Pickup time (Typical)

<8ms (3ms)

Dropoff time

<5ms

Maximal system voltage

380Vac

250Vdc

Test voltage across open contact

1000V RMS for 1min

Durability (Loaded contact)

10000 operations

Number

Up to 8 binary outputs according to various hardware configurations


(2)  Fast signaling contact

Output mode

Potential free contact

Continuous carry

5A@380Vac

5A@250Vdc

Pickup time

<1ms

Dropoff time

<5ms

Maximal system voltage

380Vac

250Vdc


l  Mechanical Specifications

Weight per device

Approx. 15kg

Device structure

Plug-in model type @ rear side, integrated frontplate

Protection class

Standard

IEC 60255-1:2009

Front side

IP40

Other side

IP30

Rear side, connection terminals

IP20


l  Ambient Temperature and Humidity Range

Standard

IEC 60255-1:2009

Operating temperature

-40°C to +70°C (Readability of display may be impaired below -20°C)

Transport and storage temperature

-40°C to +70°C

Permissible humidity

5%-95%, without condensation

Pollution degree

II

Altitude

<3000m


l  Communication Port

(1)  EIA-485 Port

Baud rate

4.8kbit/s, 9.6kbit/s, 19.2kbit/s, 38.4kbit/s, 57.6kbit/s, 115.2kbit/s

Protocol

IEC 60870-5-103:1997

Safety level

Isolation to ELV level

Twisted pair

Screened twisted pair cable


(2)  Ethernet Port

Connector type

RJ-45

ST (Multi mode)

Transmission standard

100Base-TX

100Base-FX

Protocol

IEC 60870-5-103:1997, IEC 61850

Safety level

Isolation to ELV level


(3)  Optical Fiber Port

For Station Level

Connector type

ST

Fibre type

Multi mode

Wave length

1310nm


For Process Level

Connector type

LC

Fibre type

Multi mode

Wave length

1310nm


For Synchronization Port

Connector type

ST

Fibre type

Multi mode

Wave length

820nm


(4)  Print Port

Type

RS-232

Baut rate

4.8kbit/s, 9.6kbit/s, 19.2kbit/s, 38.4kbit/s, 57.6kbit/s, 115.2kbit/s

Printer type

EPSON® 300K printer

Safety level

Isolation to ELV level


(5)  Clock Synchronization Port

Type

RS-485

Timing standard

PPS, IRIG-B

Safety level

Isolation to ELV level