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Phone: 400-027-8938

Mobile: 133 9714 9829

Product Details

  1. Features and Benefits

ND-7860F The transformer oil chromatography online monitoring system enables automated, quantitative, cyclic cleaning, oil filling, gas–oil separation, sample analysis, data processing, and real-time alarm generation. It rapidly monitors, in real time, the concentrations and growth rates of dissolved fault gases in the oil of transformers and other oil‑immersed high‑voltage power equipment, and, through an expert diagnostic system, provides early warnings of potential equipment faults, thereby preventing accidents, minimizing major losses, and enhancing operational reliability. As a next‑generation product in the field of online oil chromatography monitoring, this system offers a stable and reliable solution for implementing online, remote analysis of power transformers, serving as a robust enabler for the effective implementation of condition‑based maintenance in power systems.

ND-7860F The transformer oil chromatography online monitoring system is meticulously designed by integrating our company’s nearly twenty years of successful experience in operating automated total degassing units for power‑system chromatography, while also synthesizing the strengths and addressing the limitations of both domestic and international online oil chromatography monitoring technologies. The system retains the hallmark advantages of our products—namely, stability, reliability, and accuracy.

♦ Online Detection H 2、 CO 、 CO 2、 CH 4 , C2H4, C2H2, C2H6, H2O (optional) the concentration and the growth rate;

♦ The quantitative cleaning‑circulation sampling method accurately reflects the dissolved gas composition in transformer oil.

♦ The oil–gas separation system is safe and reliable, non‑polluting, and allows users to choose whether or not to discharge transformer oil.

♦ A dedicated composite chromatographic column is employed to enhance the separation of gas components.

♦ Employs an imported, specially designed detector to enhance the detection sensitivity for hydrocarbon gases;

♦ High-stability, high-precision gas detection technology with an error margin of ±10%;

♦ A mature and reliable communication method that employs standard network protocols and supports remote data transmission;

♦ High data acquisition reliability, employing an oversampling Δ‑Σ analog-to-digital converter with 24-bit resolution and automatic calibration;

♦ Diverse data display and query options, offering reports and trend charts, with a historical data retention period of 10 years;

♦ Excellent environmental adaptability, successfully deployed in high-altitude, high-temperature, high-humidity, and cold-climate regions;

♦ High anti-interference performance; electromagnetic compatibility complies with GB/T 17626 and IEC 61000 standards.

♦ It provides a two-level alarm function, and the alarm signal can be transmitted remotely.

♦ An open database that can be integrated into the power system’s local area network;

In addition, the ND-7860F system adopts a modular design, and the use of high-performance embedded processors enables an online chromatographic monitoring system.

The system is more stable and reliable, and features the following characteristics:

♦ Faster analysis cycle, with a minimum monitoring interval of 40–60 minutes that can be customized by the user; a recommended testing frequency is once every 24 hours.

♦ The oil–gas separation is rapid, taking just over 10 minutes; it employs specialized environmental‑adaptation technology to eliminate the influence of temperature and humidity fluctuations on the gas distribution coefficient.

♦ After analysis, the oil sample undergoes degassing and buffering treatments to eliminate entrained air bubbles prior to reinjection into the transformer tank. A multi‑layer isolation‑type oil‑reinjection (return‑oil) technique is employed to ensure that no carrier gas is introduced into the transformer body.

♦ The limit of detection for C2H2 can reach 0.1–0.5 μL/L;

♦ Employs a dual-loop, multi-mode constant-temperature control system with temperature‑control accuracy of ±0.1°C; the equipment is equipped with an automatic industrial air conditioner for maintaining a stable temperature.

♦ The system employs an embedded processor‑based control architecture, integrating multiple functions—including oil–gas separation, data acquisition, chromatographic analysis, concentration calculation, data alarming, and equipment status monitoring—into a single unit. This design eliminates the risk of data loss and significantly enhances the system’s reliability and stability.

♦ The functional interface circuit employs optocoupler isolation, further enhancing the system’s immunity to electromagnetic interference.

♦ Utilizing Ethernet, it enables all-digital, remote data transmission, control, and parameter configuration.

♦ Enhanced system fault diagnosis capabilities, offering the improved three-ratio method, the David triangle method, and the cubic diagram method, with diagnostic results provided.

♦ Strengthen system self‑diagnosis, add remote maintenance capabilities, and provide alerts for equipment malfunctions;

♦ Supports the IEC 61850 communication protocol and provides networking capabilities for similar monitoring devices, enabling centralized remote diagnostics across a given area.

♦ The system architecture employs a 19-inch standard chassis and a highly integrated, modular design, resulting in a compact structure that is easy to install and maintain, with a user-friendly interface.

♦ Highly scalable and easily integrable with other monitoring devices;

♦ With a cylinder-free design, there’s no need to replace the carrier gas annually, significantly reducing after-sales maintenance requirements. Moreover, the absence of high-pressure vessels near the transformer ensures robust equipment safety and eliminates any potential safety hazards.

  1. Technical Specifications

Serial number

Technical Parameter Name

Provide value

1

System Model

ND-7860F

2

Operating ambient temperature

-40℃ to +70℃

3

Work environment humidity

Relative humidity: 5–95% (no condensation shall occur inside the device, nor shall icing take place)

4

Atmospheric pressure

70 kPa to 110 kPa

5

Power supply

AC 220 V ±10%, 50 Hz

6

Monitoring component

H 2、  CO 、  CO 2、  CH 4、  C 2 H 4、  C 2 H 2、 C2H6、H20 (Optional) Up to seven gas components, along with trace water content, relative growth rate, and absolute growth rate; optional trace water monitoring in oil.

7

Analysis and diagnostic functions

The monitoring data were analyzed and diagnosed using the improved three-ratio method, the David triangle method, and the cubic diagram method, and the original spectra were provided.

8

Minimum detection cycle

40–60 minutes, customizable by the user; default is 24 hours.

9

Sampling method

Cyclic sampling safely and accurately reflects the actual condition of gases within the transformer.

10

Oil–gas separation method

Vacuum total degassing method

11

Data storage lifespan

≥ 10 years

12

Equipped with carrier gas capacity

Gas source generator

13

Monitoring gas

Measurement range

Minimum detection

1)

H 2

2 to 2000 µl/l

2 µl/l

2)

CO

5 to 20,000 µl/l  

5 µ l/l

3)

CH 4

0.2 to 2000 µl/l

0.1–0.5 µL/L

4)

C 2 H 4

0.2 to 2000 µl/l  

0.1–0.5 µL/L

5)

C 2 H 6

0.2 to 2000 µl/l  

0.1 -0.5 µl/l

6)

C 2 H 2

0.2 to 2000 µl/l  

0.1–0.5 µL/L

7)

C02

25 to 20,000 µL/L  

25 µl/l

8)

H2O (optional)

1 to 800 µl/L

9)

Total hydrocarbons

1 to 8000 µl/L

10)

Total gas content (optional)

0.2 to 15%

14

Stability (measurement bias)

Under the same experimental conditions, the deviation of monitoring results for the same oil sample does not exceed ±5% (at medium concentrations).

15

Electrostatic Discharge Immunity

Level 4, ±8 kV – ±15 kV

16

Electrical Fast Transient/Burst Immunity

Level 4, ± 4 kV

17

Surge (Impulse) Immunity

Level 4, ± 4 kV

18

Seismic resistance: The seismic wave is a sine wave.

Duration: Three cycles, safety factor 1.67

Earthquake intensity of 9 degrees:

Ground horizontal acceleration: 0.4g; ground vertical acceleration: 0.2g.

Seismic intensity of 8 in the area:

Ground horizontal acceleration: 0.25g; ground vertical acceleration: 0.125g.

Earthquake intensity of 7 degrees:

Ground horizontal acceleration: 0.2g; ground vertical acceleration: 0.1g.

19

Storage and transportation extreme ambient temperature

-40 ℃ to +80 ℃

20

Protective performance of the enclosure

Outdoor-mounted components (this system and the communication control unit) IP56

21

External dimensions

Width 535 mm × Depth 600 mm × Height 1100 mm

22

Overall machine weight

125kg

23

Basic dimensions

Length 800 mm × Width 600 mm × Ground clearance approximately 200 mm

Keywords:

NDYSP-70B Oil Chromatography Online Monitoring System

Service system

Offering inspection and reception services

We guarantee to welcome your visit at any time and provide you with every possible convenience.

Provide a reasonable quotation.

We guarantee to provide a unified, reasonable quotation for the products you request within 24 hours.

Provide professional technical support

We guarantee that a technical specialist will respond to any technical questions you may have within 24 hours.

Provide detailed information

We guarantee that, within 24 hours, the product catalogues, software CDs, and other technical materials you require will be delivered to your company by our local branch or office.

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