Introduction | data concentrator (2023)

The OpenAPI standard is a widely used design and documentation approach for APIs. In the past we published our RESTful APIs under the Rest.li standard, which is used internally by LinkedIn and which we have inherited since the beginning of the project.

Rest.li is a very stubborn framework that hasn't found widespread acceptance in the open source community, so users are often not familiar with the best ways to interact with these endpoints. To facilitate integration with DataHub, we are releasing a set of OpenAPI-based endpoints.

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OpenAPI endpoints are currently isolated in a servlet on the GMS and are automatically deployed with a GMS server. The servlet includes automatic generation of an OpenAPI user interface, also known as Swagger, available at<host-servidor-GMS>:<puerto-GMS>/openapi/swagger-ui/index.htmlThis is also served through the DataHub interface as a proxy with the same endpoint, but the host and port of the GMS replaced by the DataHub interface URL is available as a link in the top right dropdown under the user profile picture. Note that you can get the raw json or yaml formats from the OpenAPI specification by navigating to<baseUrl>/openapi/v3/api-docsÖ<baseUrl>/openapi/v3/api-docs.yamlRaw forms can be fed into Codegen systems to generate client-side code in the language of your choice that supports the OpenAPI format. We have seen different levels of maturity with different languages ​​in these code generation systems, so some may require customization to be fully supported.

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The OpenAPI UI includes fully documented exploitable schemas for request and response objects. Templates used in the OpenAPI UI are automatically generated at compile time from PDL templates to JSON schema compliant Java templates.

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The models can be used programmatically via the Java Rest Emitter, which contains the generated models. A minimal Java project to output to OpenAPI endpoints would need the following dependencies (Gradle format):

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The collection includes POST, GET, and DELETE for a single entity with SchemaMetadata representation

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{
"Information": {
"_postman_id": "87b7401c-a5dc-47e4-90b4-90fe876d6c28",
"Name": "DataHub OpenAPI",
"Description": "A description",
"the plan": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
},
"article": [
{
"Name": "entities/v1",
"article": [
{
"Name": "Publish Entities 1",
"Command": {
"Method": "CORREO",
"Header": [
{
"Taste": "content type",
"valentia": "application/json"
},
{
"Taste": "Accept",
"valentia": "application/json"
}
],
"Body": {
"Away": "cru",
"cru": "[\n {\n \"aspect\": {\n \"__type\": \"SchemaMetadata\",\n \"schemaName\": \"SampleHdfsSchema\",\n \"platform\": \"urn:li:dataPlatform:platform\",\n \"platformSchema\": {\n \"__type\": \"MySqlDDL\",\n \"tableSchema\": \"schema\"\n },\n \"version\": 0,\n \"erstellt\": {\n \"time\": 1621882982738,\n \"actor\": \"urn:li:corpuser:etl\" ,\n \"Imitator\": \"urn:li:corpuser:jdoe\"\n },\n \"lastModified\": {\n \"time\": 1621882982738,\n \"actor\" : \"urn:li:corpus:etl\",\n \"mimic\": \"urn:li:corpus:jdoe\"\n },\n \"hash\": \"\",\ n \"fields\": [\n {\n \"fieldPath\": \"county_fips_codefg\",\n \"jsonPath\": \"null\",\n \"nullable\": true,\ n n \"description\": \"null\",\n \"type\": {\n \"type\": {\n \"__type\": \"StringType\"\n }\n } ,\n \"nativeDataType\": \"String()\",\n \"recursive\": false\n },\n {\n \"fieldPath\": \"county_name\",\n \ "jsonPath\": \"null\",\n \"cancellable\": true,\n \"description\": \"null\",\n \"type\": {\n \"type \ " " ": {\n \"__type\": \"StringType\"\n }\n },\n \"nat iveDataType\": \"String()\",\n \"recursive\": false\n }\n ]\n },\n \"aspectName\": \"schemaMetadata\",\n \" entityType \": \"dataset\",\n \"entityUrn\": \"urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)\"\n }\n ]",
"options": {
"cru": {
"Language": "json"
}
}
},
"URL-Address": {
"cru": "{{baseUrl}}/openapi/entities/v1/",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Schornstein",
"Units",
"v1",
""
]
}
},
"answer": [
{
"Name": "ACCORDINGLY",
"initial order": {
"Method": "CORREO",
"Header": [],
"Body": {
"Away": "cru",
"cru": "[\n {\n \"aspect\": {\n \"value\": \"<Error: Too many nesting levels to spoof this schema>\"\n },\n \"aspectName\" : \"aliquip ipsum tempor\",\n \"entityType\": \"ut est\",\n \"entityUrn\": \"enim in nulla\",\n \"entityKeyAspect\": {\ n \"value\": \"<Error: Too many levels of nesting to spoof this schema>\"\n }\n },\n {\n \"aspect\": {\n \"value\" : \ "<Error: Too many levels of nesting to spoof this schema>\"\n },\n \"aspectName\": \"ipsum id\",\n \"entityType\": \"deser\" ,\n \"entityUrn\": \"aliqua sit\",\n \"entityKeyAspect\": {\n \"value\": \"<Error: Too many levels of nesting to spoof this schema>\" \n }\ n}\n]",
"options": {
"cru": {
"Language": "json"
}
}
},
"URL-Address": {
"cru": "{{baseUrl}}/entities/v1/",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Units",
"v1",
""
]
}
},
"Condition": "ACCORDINGLY",
"Code": 200,
"_postman_previewidioma": "json",
"Header": [
{
"Taste": "content type",
"valentia": "application/json"
}
],
"Cookie": [],
"Body": "[\n \"c\",\n \"labor pain exercise in\"\n]"
}
]
},
{
"Name": "Delete Entities",
"Command": {
"Method": "EXTINGUISH",
"Header": [
{
"Taste": "Accept",
"valentia": "application/json"
}
],
"URL-Address": {
"cru": "{{baseUrl}}/openapi/entities/v1/?urns=urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)&soft=true",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Schornstein",
"Units",
"v1",
""
],
"Advice": [
{
"Taste": "ballot paper",
"valentia": "urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)",
"Description": "(Required) A list of raw urnstrings supporting only a single entity type per request."
},
{
"Taste": "ballot paper",
"valentia": "Labor Pain Exercise In",
"Description": "(Required) A list of raw urnstrings supporting only a single entity type per request.",
"Disabled people": TRUE
},
{
"Taste": "polite",
"valentia": "TRUE",
"Description": "Determines whether to soft erase or hard erase, defaults to true for soft erase"
}
]
}
},
"answer": [
{
"Name": "ACCORDINGLY",
"initial order": {
"Method": "EXTINGUISH",
"Header": [],
"URL-Address": {
"cru": "{{baseUrl}}/entities/v1/?urns=urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)&soft=true",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Units",
"v1",
""
],
"Advice": [
{
"Taste": "ballot paper",
"valentia": "urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)"
},
{
"Taste": "ballot paper",
"valentia": "Customer obligations are blind",
"Disabled people": TRUE
},
{
"Taste": "polite",
"valentia": "TRUE"
}
]
}
},
"Condition": "ACCORDINGLY",
"Code": 200,
"_postman_previewidioma": "json",
"Header": [
{
"Taste": "content type",
"valentia": "application/json"
}
],
"Cookie": [],
"Body": "[\n {\n \"rowsRolledBack\": [\n {\n \"urn\": \"urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)\"\n }\n ],\n \"rowsDeletedFromEntityDeletion\": 1\n }\n]"
}
]
},
{
"Name": "Get Entities",
"protocolProfileBehavior": {
"Disable URL Encoding": INCORRECT
},
"Command": {
"Method": "RECEIVE",
"Header": [
{
"Taste": "Accept",
"valentia": "application/json"
}
],
"URL-Address": {
"cru": "{{baseUrl}}/openapi/entities/v1/latest?urns=urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)&aspectNames=schemaMetadata",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Schornstein",
"Units",
"v1",
"the last"
],
"Advice": [
{
"Taste": "ballot paper",
"valentia": "urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)",
"Description": "(Required) A list of raw urnstrings supporting only a single entity type per request."
},
{
"Taste": "ballot paper",
"valentia": "Labor Pain Exercise In",
"Description": "(Required) A list of raw urnstrings supporting only a single entity type per request.",
"Disabled people": TRUE
},
{
"Taste": "aspect names",
"valentia": "Metadata Scheme",
"Description": "The list of skin names to retrieve"
},
{
"Taste": "aspect names",
"valentia": "Labor Pain Exercise In",
"Description": "The list of skin names to retrieve",
"Disabled people": TRUE
}
]
}
},
"answer": [
{
"Name": "ACCORDINGLY",
"initial order": {
"Method": "RECEIVE",
"Header": [],
"URL-Address": {
"cru": "{{baseUrl}}/entities/v1/latest?urns=urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)&aspectNames=schemaMetadata",
"Host": [
"{{baseUrl}}"
],
"Away": [
"Units",
"v1",
"the last"
],
"Advice": [
{
"Taste": "ballot paper",
"valentia": "no exercise curtains",
"Disabled people": TRUE
},
{
"Taste": "ballot paper",
"valentia": "urn:li:dataset:(urn:li:dataPlatform:platform,testSchemaIngest,PROD)"
},
{
"Taste": "aspect names",
"valentia": "no exercise curtains",
"Disabled people": TRUE
},
{
"Taste": "aspect names",
"valentia": "Metadata Scheme"
}
]
}
},
"Condition": "ACCORDINGLY",
"Code": 200,
"_postman_previewidioma": "json",
"Header": [
{
"Taste": "content type",
"valentia": "application/json"
}
],
"Cookie": [],
"Body": "{\n \"Antworten\": {\n \"urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)\": {\n \"entityName\": \"dataset\ ",\n \"urn\": \"urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)\",\n \"aspects\": {\n \"datasetKey\" : {\n \"name\": \"datasetKey\",\n \"type\": \"VERSIONED\",\n \"version\": 0,\n \"value\": {\ n \"__type\": \"DatasetKey\",\n \"platform\": \"urn:li:dataPlatform:hive\",\n \"name\": \"SampleHiveDataset\",\n \ "origen\": \"PROD\"\n },\n \"criado\": {\n \"tiempo\": 1650657843351,\n \"actor\": \"urn:li:corpuser:__datahub_system \"\n }\n },\n \"schemaMetadata\": {\n \"name\": \"schemaMetadata\",\n \"type\": \"VERSIONED\",\n \" versão\": 0,\n \"valor\": {\n \"__tipo\": \"SchemaMetadata\",\n \"schemaName\": \"SampleHiveSchema\",\n \"plataforma\" : \"urn:li:dataPlatform:hive\",\n \"version\": 0,\n \"criado\": {\n \"time\": 1581407189000,\n \"actor\": \"urn:li:corpuser:jdoe\"\n },\n \"lastModified\": {\n \"time\": 1581407189000,\n \"actor\": \"urn:li:cor p user: jdoe \"\n },\n \"hash\": \"\",\n \"platformSchema\": {\n \"__type\": \"KafkaSchema\",\n \"documentSchema \": \"{\\\"tipo\\\":\\\"registro\\\",\\\"nombre\\\":\\\"SampleHiveSchema\\\",\\\" espacio de nombres\\ \":\\\"com.linkedin.dataset\\\",\\\"doc\\\":\\\"Sample Hive dataset\\\",\\\"fields\ \\":[ {\\\"nombre\\\":\\\"field_foo\\\",\\\"tipo\\\":[\\\"cadena\\\"]},{ \\\"Name \\\":\\\"barra_campo\\\",\\\"tipo\\\":[\\\"booleano\\\"]}]}\"\n }, \n \"campos\": [\n {\n \"fieldPath\": \"field_foo\",\n \"nullable\": false,\n \"description\": \"Foo-Feldbeschreibung\ ",\n \ "tipo\": {\n \"tipo\": {\n \"__tipo\": \"BooleanType\"\n }\n },\n \"nativeDataType\": \" varchar(100)\ ",\n \"rekursiv\": false,\n \"isPartOfKey\": true\n },\n {\n \"fieldPath\": \"field_bar\",\n \ "anulável\": falso,\n \"descrição\": \"Descrição do campo de barra\",\n \"tipo\": {\n \"tipo\": {\n \"__tipo\" : \"BooleanType\"\ n }\n },\n \"nativeDataType\": \"boolean\",\n \"recursive\": false,\n \"isPartOfKey\": false\n } \ n ]\n },\ n \"criado\": {\n \"tiempo\": 1650610810 000,\n \"actor\": \"urn:li:corpuser:DESCONOCIDO\"\n }\ n }\n }\n }\n }\n}"
}
]
}
],
"Permit": {
"Typ": "Carrier",
"Carrier": [
{
"Taste": "symbolic",
"valentia": "{{symbolic}}",
"Typ": "Chain"
}
]
},
"Fall": [
{
"Hear": "pre-order",
"road map": {
"Typ": "text/javascript",
"executive": [
""
]
}
},
{
"Hear": "court hearing",
"road map": {
"Typ": "text/javascript",
"executive": [
""
]
}
}
]
}
],
"Fall": [
{
"Hear": "pre-order",
"road map": {
"Typ": "text/javascript",
"executive": [
""
]
}
},
{
"Hear": "court hearing",
"road map": {
"Typ": "text/javascript",
"executive": [
""
]
}
}
],
"Variable": [
{
"Taste": "urlbase",
"valentia": "localhost:8080",
"Typ": "Chain"
},
{
"Taste": "symbolic",
"valentia": "eyJhbGciOiJIUzI1NiJ9.eyJhY3RvclR5cGUiOiJVU0VSIiwiYWN0b3JJZCI6ImRhdGFodWIiLCJ0eXBlIjoiUEVSU09OQUwiLCJ2ZXJzaW9uIjoiMSIsImV4cCI6MTY1MDY2MDY1NSwianRpIjoiM2E4ZDY3ZTItOTM5Yi00NTY3LWE0MjYtZDdlMDA1ZGU3NjJjIiwic3ViIjoiZGF0YWh1YiIsImlzcyI6ImRhdGFodWItbWV0YWRhdGEtc2VydmljZSJ9.pp_vW2u1tiiTT7U0nDF2EQdcayOMB8jatiOA8Je4JJA",
"Typ": "By default"
}
]
}
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FAQs

What is a data concentrator? ›

A data concentrator is the core of data and energy management in an AMI. It provides the technology to measure and collect energy usage data. The concentrator can also be programmed to analyze and communi- cate this information to the central utility database.

What is concentrator in data communication? ›

A device that merges many low-speed asynchronous channels into one or more high-speed synchronous channels to achieve economies of data transmission.

What is the function of data concentrator? ›

Data concentrators are used to concentrate the communication and management of a set of smart meters into one single device, facilitating the gathering of the information from the smart meters, grouping the communications to them, and therefore reducing the cost of the overall operations.

What is DCU in aircraft? ›

DCU collects analog, discrete and digital data from various avionic and aircraft systems. DCU accomplishes necessary measurements, computations and any logical operations then presents concentrated information to use of avionics and aircraft systems with analog, discrete and digital communication.

What is DCU in electrical? ›

Overview. AEC's Data Concentrator Unit (DCU) is the backbone of Advanced Metering Infrastructure (AMI) that helps in data acquisition, transfer of energy data to the central database, and automated meter reading in electronic energy meters. DCUs are primarily used in low voltage electric power systems.

Which network device is concentrator? ›

A hub (sometimes referred to as a concentrator) is to a network device which receives a data packet from one network node and retransmits to all other connected nodes.

Is a router a concentrator? ›

A virtual private network (VPN) concentrator is a type of networking device. It lets you create secure VPN connections and deliver messages between VPN nodes. As such, it is essentially a router but is built specifically for creating and managing VPN communication infrastructures.

What is the difference between a hub and concentrator? ›

Hubs, which are also referred to as concentrators, are found in local area networks. These products serve as network hardware devices with ports providing connectivity to computers, printers and other peripheral hardware for the exchange of information.

What is data concentrator in Scada? ›

Data Concentrator Unit (DCU) is an intelligent unit used to acquire data from multiple meters in a substation. DCU supports DLMS/COSEM protocol and can acquire data from a maximum of 20 meters. It is compatible with the meters manufactured by majority of Indian meter manufacturers.

How does a concentrator Digitise your? ›

The concentrator digitizes your voice at a sample rate of 8,000 samples per second and 8-bit resolution (see How Analog and Digital Recording Works for information on digitizing sounds).

What is data concentrator in substation? ›

A data concentrator is a software and hardware solution that connects a number of data channels with one destination. Data concentrators are found within substations to help manage many different data sources at one main source.

What is DCU used for? ›

DCU provides a wide variety of services to consumers and businesses: Consumer banking and lending services – including checking, savings, mortgages, equity loans, auto loans, credit cards, and much more.

Why do planes use 28 VDC? ›

If the electrical system were regulated to 12 or 24 volts, the battery would not recharge during flight. A 28-volt system is generally more efficient than a 14-volt system because the same amount of electrical power can be carried in smaller wires. Remember, usable electrical power is the combination of volts and amps.

What is VMO and MMO in aviation? ›

VMO/MMO means maximum operating limit speed. VMU means minimum unstick speed. VNE means never-exceed speed. VNO means maximum structural cruising speed. VR means rotation speed.

What is DCU in metering? ›

COPS-TARA DCU (Data Concentrator Unit) is a communication device to transfer meters data to control center for real-time access. DCU collects data from meters using MODBUS/DLMS standard protocol and sends to control center over OFC/Wired Internet/GSM/GPRS/3G/4G networks in real-time basis.

What is the full form of DCU? ›

The DC Universe (DCU) is the fictional shared universe where most stories in American comic book titles published by DC Comics take place.

How does a VPN concentrator work? ›

Starting at the forefront of a network, either next to or beneath a firewall, a VPN concentrator works by establishing multiple encrypted tunnels between remote employees and a centralized network. The VPN concentrator has employees' IP addresses and web traffic travel through these tunnels before reaching the network.

What is VPN concentrator vs VPN server? ›

The concentrator works similarly to a VPN, but on a larger scale. It also encrypts data and web traffic. In addition, the concentrator tunnels data using security protocols. The major difference between a VPN concentrator vs VPN server is that the former is rarely used in private settings.

Is a VPN concentrator hardware or software? ›

A VPN concentrator is a hardware device that creates and helps to manage multiple VPN connections remotely. Similarly to a VPN, it encrypts outgoing and incoming data and uses security protocols to create safe tunnels, but on a larger scale.

How long does a concentrator last? ›

Most portable oxygen concentrators last between 4 to 7 years. The lifespan of a POC also depends on how well the patient takes care of their portable unit. It's important to regularly clean and maintains a device. This will help improve how long the machine lasts.

Do and don'ts for oxygen concentrator? ›

DO keep your device away from bodies of water and be aware of the weather. Don't allow your oxygen concentrator to get wet. DO keep your portable oxygen concentrator in a well-ventilated area. DO NOT leave your oxygen equipment in a vehicle when not in use.

What are the 4 types of routers? ›

They are wired routers, wireless routers, core routers, edge routers and VPN routers.

What is a WiFi concentrator? ›

The Concentrator is the communication bridge between the core sensing units and main station of InHand Wireless Overhead Line System.

What are the 3 basic hub types? ›

There are three types of network hubs: passive, active, and intelligent. network. They do not improve the performance of local area networks (LANs), and may limit maximum media distances. Typically, passive hubs are connected to other devices in a star configuration.

How long can oxygen concentrator run continuously? ›

Home oxygen concentrators can run 24 hours per day. Portable units are sometimes not appropriate for sleep if they only deliver pulse flow oxygen. Check with one of our Oxygen Specialists regarding your oxygen needs before purchasing a unit for continual use.

What are 2 main functions of a hub? ›

A hub is a physical layer networking device which is used to connect multiple devices in a network. They are generally used to connect computers in a LAN. A hub has many ports in it. A computer which intends to be connected to the network is plugged in to one of these ports.

What are the 3 main components of SCADA? ›

SCADA components include the following:
  • Sensors and actuators. A sensor is a feature of a device or system that detects inputs from industrial processes. ...
  • SCADA field controllers. These interface directly with sensors and actuators. ...
  • SCADA supervisory computers. ...
  • HMI software. ...
  • Communication infrastructure.

What are the four 4 levels of SCADA? ›

They pull together hardware, software, and connectivity and then organize it into four layers: field instrumentation; programmable logic controllers (PLCs) and remote telemetry units (RTUs); communications; and the SCADA host platform.

What is the difference between SCADA and DDC? ›

DCS is process state driven, while SCADA is event driven.

SCADA is a bit more advantageous in this aspect, as it lightens the load of the host. Changes are also recorded much earlier, as an event is logged as soon as a value changes state.

How do landlines connect to cell phones? ›

Use A Specialized Jack To Connect Phones

Next you'll need to purchase a specialized jack, such as Cell2Jack. This little device is designed to connect any landline phone to a cellphone. You'll plug your home phone into Cell2Jack's phone port and plug Cell2Jack's other end into a USB port.

What can I do with old phone lines in my house? ›

First, either remove the box altogether, or cut the wires and tape up the ends with electrical tape so they don't touch each other. Or, even better, trace the line to its source and remove/disconnect the entire wire. Then you can patch the wall with this tried and true method or a wall repair kit on Amazon.

What is the average cost of an Inogen? ›

Inogen portable oxygen concentrators vary in cost, ranging from $2,651 to $3,586, depending on the battery (single or double) and warranty you select.

What are the main three levels of substation automation system? ›

Substation automation can be structured into three levels: process, bay and station-level automation. At the process level, information from the sensors in the substation is extracted and transferred to an upper-level device called the bay-level device.

What is the price of data concentrator? ›

Data Concentrator Unit at Rs 16000/piece | Mundka | Delhi | ID: 20525215630.

Why Scada is used in substation? ›

SCADA system continuously monitors the status of various equipments in substation and accordingly sends control signals to the remote control equipments. Also, it collects the historical data of the substation and generates the alarms in the event of electrical accidents or faults.

Does DCU have a monthly fee? ›

Every DCU account includes: No minimum balance requirements. No monthly maintenance fees.

How long does DCU take to approve? ›

Lenders who provide online applications– including DCU – are generally quicker with processing, with many people receiving their funds within one or two business days of the application submission.

How do you become eligible for DCU? ›

You are automatically eligible to join DCU if you live, work, worship, or attend school in one of the communities in our list. Any business or other legal entity located in one of these areas is also automatically eligible to join.

Why do aircraft use 400Hz power? ›

With 400 Hz, airplanes require fewer generators or alternators to produce a sufficient amount of power. This reduces their total weight, thereby making it easier for airplanes to take off. If airplanes used a lower power frequency, they would require more generators or alternators, thus increasing their total weight.

Why does the military use 400Hz? ›

So for the short distances involved in aircraft, and the advantage of smaller and lighter transformers, motors and filter capacitors, 400Hz was adopted, particularly for military aircraft: MIL-STD-704F states: “Equipment designed for use on military aircraft should not use 60 Hz power, since it requires more weight and ...

Why 115v is used in aircraft? ›

Running at 115v 400Hz allows the use of smaller transformers. Less energy has to be stored in the transformer core per cycle, so the core can be smaller. A smaller core means a lighter transformer, and reducing weight is a good thing in an aircraft.

What is VMO and VL? ›

Anterior knee pain (AKP) is a common musculoskeletal complaint. It has been suggested that one factor that may contribute to the presence of AKP is a delay in the recruitment of the vastus medialis oblique muscle (VMO) relative to the vastus lateralis muscle (VL).

What happens if you exceed MMO? ›

Exceeding either Vmo or Mmo will result in the activation of an aural warning (clacker). As an example, the diagram shows the flight envelope for the 757-200. Notice that below approximately FL270, the airplane is Vmo restricted to 350 KIAS. Above approximately FL270, the airplane is Mmo restricted to 0.86 Mach.

What is the difference between VMO and MMO? ›

VMO is a structural limitation ( not to broke a part of the airframe, say for ex. the windshield) and is increasing with altitude, and MMO is an aerodynamic limitation (not to get supersonic on wings) and does nor vary. Hope it helps! Warning Toxic!

What is data concentrator unit for smart meter? ›

DCUs (Data Concentrator Units) are Intelligent Devices which are the backbone of Advanced Metering Infrastructure (AMI) that helps in data acquisition, transfer of energy data to the central database Head End System (HES) and Automated Meter Reading (AMR) in electronic energy meters which employ Radio Frequency (RF) ...

What is phasor data concentrator? ›

Phasor Data Concentrators (PDCs) are devices which aggregate and time synchronize (or time align) phasor data streamed from Phasor Measurement Units (PMUs) from across the grid. A PDC is a critical link be-tween the PMUs which collect the phasor data and the synchrophasor applications which use the data.

What are the three 3 types of SCADA? ›

The SCADA systems are of four types are Monolithic SCADA system, Distributed SCADA system, Networked SCADA system, and IoT SCADA system.

Why you should opt out of smart meter? ›

Smart Meters generate both radio frequency (RF) radiation and electromagnetic field (EMF) radiation. This "electrosmog" is an extremely hazardous environmental pollutant responsible for many health problems.

Will a smart meter work without Internet? ›

All smart meters use a national wireless communication network to send information to your energy supplier. So, even if you do not have an internet connection in your home, a smart meter will still work.

Are there 2 types of smart meters? ›

There are two main types of smart meters - the older models known as SMETS 1 (Smart Meter Equipment Technical Specifications) and the newer versions that were rolled out in 2018, known as SMETS 2. This specification is more advanced and meters were first rolled out in 2018.

What is the difference between PMU and PDC? ›

The Phasor Measurement Unit (PMU) is a device that allows synchronized measurement of the voltage and current of electrical systems in microseconds. The PMUs are installed in substations of the power system and their measurements are sent to be processed by the Phasor Data Concentrator (PDC).

How does a PMU work? ›

A phasor measurement unit (PMU) measures the phasor values of current and voltage. These values get a high precision time stamp and together with the values of power frequency, power frequency change rate and optional binary data that are also time stamped are transmitted to a central analysis station.

Why is phasor important? ›

One good use of phasors is for the summing of sinusoids of the same frequency. Sometimes it is necessary when studying sinusoids to add together two alternating waveforms, for example in an AC series circuit, that are not in-phase with each other.

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References

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