Nanjing Nanrui PCS9611 Line Protection Device

Nanjing Nanrui PCS9611 Line Protection Device

Protection configuration:

l Three sections of overcurrent protection that can withstand overvoltage and directional locking, and one section of overcurrent inverse time limit protection

l Three stage zero sequence overcurrent protection and one stage zero sequence overcurrent inverse time limit protection/Small current grounding line selection

l Overcurrent acceleration protection and zero sequence acceleration protection(Zero sequence current can be self generated or externally applied)

l Overload function(Alarm or trip)

l Low cycle load reduction function

l Three phase primary reclosing

l Low current grounding line selection function (must use external zero sequence current)

l Independent operating circuit

Operation alarm:

l Total signal of the accident

l CT Wire break alarm

l busbar PT Wire break alarm

l Control circuit disconnection alarm

l TWJabnormal alarm

l line PT Wire break alarm

l Overload alarm

l zero sequenceSection III alarm

l ground alarm

l Spring energy storage failure alarm

l Frequency abnormality alarm

Measurement and control function:

l 15 Customized remote signaling input for the road

l A set of remote control circuit breakers/combine, synthesize(Up to three additional remote controls can be provided as an optional option)

l IamTheIbmTheIcmTheUA TheUB TheUC TheUAB TheUBC TheUCA TheU0 TheFTheP TheQ TheCOSφWaiting for remote measurement

l event SOErecord

Nanjing Nanrui PCS9611 Line Protection Device

1. Software working principle

1.1 Device start-up components

The device has set different starting elements for each protective element, and the calculation of protective elements can only be carried out after startingThe device has dual sampling capability Sample technology, the main channel samples data for protection component calculation, and the backup channel samples data for opening the positive outletSource. Only starting components Only when both the protective component and the dual channel sampling data meet the action requirements, can the outlet be tripped. Otherwise, it cannot be trippedtripping operation.

l Overcurrent protection starting element

When the maximum value of three-phase current is greater than 0.95 Operates at times the minimum current setting value. thisThe starting component is used to activate the corresponding overcurrent protection. l Zero sequence overcurrent protection starting element

When the zero sequence current is greater than 0.95 Operates when the minimum zero sequence current setting value is doubled. This starting element is used to activate the corresponding zero sequence overcurrent protection.

l Overload protection starting element

When the maximum value of three-phase current is greater than 0.95 Operates when the overload current setting value is doubled. This starting component is used to open the corresponding overload protection Protect.

l Overcurrent acceleration protection starting element

When the maximum value of three-phase current is greater than 0.98 Operates when the overcurrent acceleration setting value is doubled.This startup component is used to activate overcurrent acceleration protection. l Zero sequence acceleration protection starting element

When the zero sequence current is greater than 0.98 Operates when the zero sequence overcurrent acceleration setting value is doubled. This starting component is used to activate zero sequence acceleration protection.

l Low frequency load shedding protection starting element

When the low-frequency load shedding protection charging is completed and the system frequency is lower than the low-frequency protection low-frequency setting value, and all phase to phase voltages are higher than low When the frequency protection low voltage lock value is activated, this starting element is used to open the low voltageFrequency shedding protection.

l Reclosing starting element

When the reclosing function is activated, the reclosing conditions are not consistentWhen satisfied, this initiating component is used to activate the reclosing function.

1.2 overcurrent protection

This device is equipped with three sections of overcurrent protection and one section of independent overcurrent inverse time protection, each section has independent current and time settingsand Control word. Each section can independently choose whether to use compound voltage locking (low voltage and negative sequence voltage) or directional locking.

On the busbar PT When the wire is disconnected, it can be controlled through the control word“PT Disconnected current protection”Select to exit the current protection of the section at this time for the compound voltage lockout Should the direction be locked to become pure overcurrent protection, or should the current protection be directly exited. The term referred to here“current protection”It refers to those who have invested Current protection section for compound voltage or directional locking. There is no power supply for both voltage and direction lockingThe flow protection segment is not subject to this control The influence of character creation.

overcurrent Section I, overcurrent section II, and overcurrent section III are fixed with definite time protection, and an independent overcurrent inverse time protection is set upThis device Integrated together 3 Over current inverse time limit protection with various characteristics, users can choose according to their needsChoose any type of inverse time protection feature. Overcurrent reverse time The limit protection feature is listed as a fixed value item in the device's fixed value menu“overcurrentInverse time characteristic”.