XT/PDD-1A Digital Partial Discharge Detector

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XT/PDD-1A Digital Partial  Discharge Detector


The series product is a newgeneration of comprehensive testing, analysis, monitoring product for transformerpartial discharge with performance of super anti-interference and mainly appliedto partial discharge detection and on-line monitoring for large powertransformers and other HV electric equipments with a variety of voltage classand capacity.

II.  Product Features

XT/PDD-1A seriesdigital partial discharge detector combines technologies of computer, analogelectronic, high-speed signal acquisition, digital signal processing andgraphics display, ultrasonic testing and various anti-interference and networkcommunication.

1. Partial discharge detection

Introduce signals simultaneously from 5 test points (4 ultrasonic channelsand 1 high-frequency current channel) from transformer, and analyze partialdischarge for transformers or HV electric equipments by electrical method andradio-acoustic method;

Measurement, statistics and analysis of partial discharge repetitiondischarge number;

Analysis for single discharge pulse waveform and determine dischargenature;

Gain range: adjust each channel individually, smooth adjust waveformdisplay at any time and not affect measurement results;

Random interference which is not synchronized with power supply can beremoved effectively by anti-disturbance function of relative filteringtechnology;

Band-pass filter adopts technology of analog and digital mixed-filtering, broadbandcan be combined random, which can restrain various kinds of interferenceefficiently.

Function of partial discharge intelligent recognition can automaticallyidentify interference signals and partial discharge signals at specificcondition, and remove interference.

2. On-line monitoring for partial discharge

The on-line monitoring for partial discharge makes the partial dischargemeasuring technology as the core, utilizes integrated testing method ofelectrical pulse and ultrasonic to record and analyze monitoring data in aperiod, and then get figure of discharge change trend. The system shall sendalarm signal when the monitoring data is more than early warning value. Hiddendangers of partial discharge for transformer and other HV electric equipmentscan be found in time by on-line monitoring for partial discharge, so the earlyforecasting fault can be reached in order to avoid malignant accidents.

Adopting broadband current transformer collects discharge signals of HVelectric equipment through neutral ground circuit or core ground circuit andoil tank ground circuit. Adopting many kinds of anti-interference methods torestrain all kinds of outer noise interference and improve signal to noiseratio, thus, the detection accuracy is increased efficiently.

Multi-channel data collection is adopted by system, which can collect anddeal with discharge signals and ultrasonic signals. The system complex utilizestechnology combination of data and simulating compound filtering, dynamicbandwidth filtering, discharge signal intelligent recognition and otheranti-interference technologies.

Inter-city datatransportation can be realized by internet, so the operating condition ofequipment can be known at any place and time, which can lead the remote on-linemonitor of HV electric equipment (such as transformer) realized.

III. Technical performanceindicator

1.     Main Processor



DISPLAY SCREEN: industrial grade high-brightness 3.5-inchtrue color TFT LCD touch screen, display resolution: 320*240;

External interface: LCD touch screen interface, 5-waysignal input interface, RS-232 interface, RS-485 interface.

2.     Working environment:

Environmenttemperature:  -1045    

Relativehumidity≤ 95%

3.     Measurement channels: 5 channels (4ultrasonic channels, 1 high-frequency current channel)

4.     Sensitivity detection: 10pC

5.     Sampling accuracy:  12Bit

6.     Sampling rate: 20MHz

7.     Measurement range: 10pC1000nC

8.     Full-scale non-linearerror: 8%

9.     Scale non-linearerror: 5%

10. Scale switch: ×1,×10,×100

11. Measurement frequency band: 3dBboardband 10kHz1MHz

12. Power supply: AC 220V; frequency 50Hzpower 30W

13.  Dimension:length*width*height(300×200×105mm

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Q:What kind of jobs are there for an Associate’s Degree in Electrical Engineering?
You can get a job as an electronic engineering technicians. You help design, develop, test, and manufacture electrical and electronic equipment such as communication equipment, medical monitoring devices, navigational equipment, and computers. You may work in product evaluation and testing, using measuring and diagnostic devices to adjust, test, and repair equipment. Median annual wages of wage and salary electrical and electronic engineering technicians were $53,240 in May 2008. The middle 50 percent earned between $41,550 and $64,120. The lowest 10 percent earned less than $32,490, and the highest 10 percent earned more than $78,560. Median annual earnings in the industries employing the largest numbers of electrical and electronic engineering technicians were:
Q:Who can tell me how ski lifts and snow making equipment work?
Your electric drive motors run on high voltage. Three phase 480v. All of your controls and safety systems run on low voltage. Battery powered, 24 or 48 volt. This is so that the lift can operate properly in the event of a power outage that cuts power to the drive. Lifts have backup drives, usually a diesel generator that can supply power to the electric drive motor, or an actual gas or diesel motor that can be coupled to the gearbox and drive the lift itself. Controls are usually a programmable logic control that monitor proper operation of different components of the lift and through a series of relays send power to the drive. Snowmaking is as aforementioned powered by large electric pumps and air compressors. Air and water are pumped usually from a central location and piped around the mountain to hydrants. Here, the snow guns are connected to the air and water. Some types of guns simply blow the water and air to make snow, while some have motors on them. These plug in to electrical pedestals, high voltage, that are located at the hydrant locations. These power large fans that help disperse the water and also control oscillating guns.
Q:I'm always tired and sleepy now and i don't know why ?
You may be starting puberty, and that would make this normal.
2005 NEC section 110.26 states free space in front of electrical equipment must be at least 30 (762mm) wide. This clear space must continue from the floor to the height specified in section 110.26 (E). Doors or panels on the electrical equipment must be capable of opening at least a 90 - degree angle. Contact your local electrical inspector in the building department. They'll take care of you. Good Luck Tom A Sr. Construction Project Manager Albion, MI
Q:Can I learn Electrical Engineering casually?
what kind of things are you trying to learn? General household appliance maintenance or would like to design your system to do something cool? You could learn both types casually if you are really interested.
Q:Why are utilities monitoring your electrical power consumption?
You may need to update your electrical equipment for more efficiency.
Q:What exactly does an Electrical Engineer do?
He engineers electrical things. And Pedro I. Wong may have a very valid point! ;-)
Q:If a neighbour is using equipment to interfere with your FM radio (one particular channel) is it detectable?
Most electrical or electronic equipment is governed by a user honesty system where if the interfere with other equipment they are required to fix it. Especially if it is ham radio or CB radio. If it is a sewing machine or other home electrical item ring your communications dept. and they will take care of it. Sewing machines can be quite noisy as far as signals and interference go. As far as prosecution is concerned, that won't be up to you. The relevant dept will make that call based on what sort of equipment they are using. I think you should find out which dept. is in charge of radio signals and the like and talk to them. Good luck VK3FMPB
Q:Is mounting Pad-mounted equipment overhead illegal?
I don't believe that there is anything in the NEC that addresses this. Obviously, installing anything on a structure presents challenges that require the attention of a qualified structural engineer. And depending on the location, you could be facing some additional concerns. You would need to check on seismic activity in the area, and since 'pad mount' equipment has a broad profile, wind-loading could be more challenging if you have a wind-force specification to meet. The other issue you would need to consider is whether installation on a structure presents any particular safety concerns. Without knowing any more, my inclination would be to think that you might want to provide an enclosure around the structure to prevent civilians (rmeaning 'teenagers and drunk college students) from climbing it. Just out of curiosity - why does your client want this? We know that the client is always right - even when he insists to stupid things. I trust there is a good reason for asking for something that is bound to increase installation cost by probably 100%.
Q:Earthing in elecctrical equipment? what is it?
Earthing system helping for Human safety to avoid electrocution due to earth leakage.Earth is acting like a Huge conductor because of it minerals Moisture contend (water).If any electrical equipment Insulation failure leakage will be there ,if the same equipment is not Grounded ,there is a possibilitiesof getting electric shock to Human.If the same equipment is Grounded the leakage current will flow to Earth protect from electric shocks Trip the circuit. Pl. check this link for brief idea.

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