Nanjing Nanrui Jibao PCS9611 microcomputer protection device

Nanjing Nanrui Jibao PCS9611 microcomputer protection device

1. Mechanical dimensions

The device adopts a fully enclosed design 4UHalf layer standard chassis, can be installed with grouped screens, or can be installed in the switchgearGround installation. Reference ruler for switchgear installation The installation dimensions of inch and group screen are shown separately 10.1-1and 10.1-2.

2 Grounding instructions

The switching operation of high-voltage equipment can generate transient overvoltage in the control cable. electricalThe device or circuit at the installation site is affected by electromagnetic interference The presence of disturbance induces interference currents within it. All of these may interfere with the normal functioning of electronic devicesfunction.

On the other hand, electronic devices in operation can emit signals that may affect other electronic devicesNormal operation interferes with electromagnetic fields.

In order to minimize these impacts as much as possible, it is necessary to follow some guidelines regardingStandards for ground, wiring, and shielding.

3 Grounding column of the device

The power supply of this device is located on the rear panel/Open a plugin（PWR）There is a grounding pole on top that can be grounded through a flat copper stranded wire. When grounded, To make the grounding with flat copper stranded wire as short as possible. The device can only be grounded at one point and is not allowed to be connected from device to deviceConnect the grounding terminal into a loop The road.

When the power/Open a plugin（PWR）When reliably and tightly inserted into the device chassis, the grounding terminal is connected to the metal shell of the device chassis. There are also grounding markings on other terminal blocks of the device, and all of these terminals with grounding markings are on the deviceInternally, it has been connected to the device machineBox connection. Therefore, the entire device only needs to be powered by a power source/Open a plugin（PWR ）The grounding pole on top is grounded.

4 Device communication grounding

When using Ethernet communication, if RJ-45 Interface and communication cable are necessaryStandard Category 5 wire with shielding must be used to crimp the crystal head The sequence of network cables must follow the standard; If fiber optic interfaces are used, when connecting or disconnecting fibers, they should be plugged in and outConnectors, cannot be pulled or pulled Twist or bend optical cables. Unconscible damage may increase the attenuation of optical fibers, leading to communication issuesThe letter is abnormal.

When used between devices and communication equipment RS-485To communicate through the interface, it is necessary to carefully confirm that the cable connection is completeOkay, I recommend using a shielded device Twisted pair cable. Communication wiring requirements: The shielding layer is grounded at one end, and when one pair of twisted pair cables is differentially paired, the other pair of twisted pair cables is groundedSignal ground.

5. Plugin configuration

5.1 CPUplugin

Nanjing Nanrui Jibao PCS9611 microcomputer 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”.