DH-DYZX-500 Voltage Transformer Online Monitoring Device

1 Product Introduction

1.1 Main functions and features

u Product advantages:The measurement error of voltage transformers can be evaluated without the need for power outages or the presence of testing personnel.

u Application layer functionality:

Ø sitemap：

a) Display monitoring information, statistical information, and status information of provincial stations. It can monitor the operating status of high-voltage transformers in operation throughout the province, and count the number of high-voltage transformers in operation with normal, out of tolerance, and high-risk operating errors.

b) Display the wiring diagram of the entire station's primary system, the location of the monitored transformers, and the current error status.

Time series display: visually display the time series changes of transformer frequency, amplitude, initial phase, and three-phase voltage imbalance to assist in determining the status of the transformer.

Ø Error Impact Control Analysis: Provides an error impact factor analysis tool based on the control variable method, which separates the impact of a single variable on measurement error from multiple impact variables.

u accuracy:Can meet the online detection needs of 0.2 level transformers

u Timeliness:Long term dynamic tracking of measurement error status of voltage transformers can be achieved

1.2 Main parameters

1.2.1 Working power supply

c) Rated voltage: AC 220V, allowable deviation range: 85V~264V, frequency 50Hz, allowable deviation ± 5%;

d) Overall power: not exceeding 130W.

1.2.2 Rated parameters

a) Linear input voltage: AC 100/√3V

b) Rated frequency: 50Hz, range: 49.5Hz~50.5Hz

c) Power consumption: not exceeding 0.1VA per phase

1.2.3 Functional Parameters

The standard configuration can provide 12 voltage conversion channels (4 sets of voltage transformers), and after expansion, it can provide up to 30 voltage conversion channels.

1.2.4 Weight:

Standard configuration: 32kg

Maximum configuration: 64kg

1.3 Main purpose and scope of use

Transformer is an important device in the sensing layer of ubiquitous power Internet of Things, and it is an important foundation to support ubiquitous power Internet of Things. Its accuracy is related to various advanced applications such as trade settlement and relay protection. The device is mainly used in the cabinets of substations with voltage levels of 110kV and above. By collecting and analyzing the operating data of the voltage transformers in the station and external environmental parameters, it achieves online evaluation of the measurement error status of the voltage transformers under uninterrupted power conditions.