CN201955462U - Wireless synchronous data acquisition device for DC mutual inductor verification of DC converter station - Google Patents

Abstract

A wireless synchronous data acquisition device for DC transformer calibration in a DC converter station, consisting of a master measuring device and a slave measuring device; the master measuring device is composed as follows: the master wireless communication unit and the master GPS synchronous clock unit respectively connection, the master measuring unit is used to introduce the secondary voltage signal of the standard DC transformer, and its output terminal is connected to the master; the above-mentioned slave measuring device is composed as follows: the slave wireless communication unit and the slave GPS synchronous clock unit are respectively connected to the slave , the slave measurement unit is used to introduce the secondary voltage signal of the DC transformer to be calibrated, and its output terminal is connected to the slave; both the master measurement unit and the slave measurement unit are composed of voltage sensors and A/D converters connected in series . It can carry out on-site wireless calibration test on the DC transformer, which solves the problem of difficult wiring for on-site calibration of the DC transformer in the DC converter station.

Description

A wireless synchronous data acquisition device for DC transformer calibration in DC converter stations

technical field

The utility model relates to a data acquisition device for checking a DC transformer, specifically a wireless synchronous data acquisition device for checking a DC transformer in a DC converter station, and is used for calibration, verification and verification of a DC transformer. detection field.

Background technique

The DC current transformer is an important primary equipment of the DC transmission system, and its operation reliability and stability are directly related to the safe and stable operation of the DC transmission system. The DC transformers used in the converter stations that have been put into operation are all imported products. In actual operation, the DC transformers of some converter stations have failed many times, and some failures directly lead to the single-pole blocking of the DC system. Due to the lack of corresponding DC transformer standards and supervision procedures, and the difficulty of carrying out calibration tests on site, there has been no regular verification/calibration plan for DC transformers for a long time. One of the difficulties in carrying out on-site calibration tests of DC transformers is that in error calibration tests, the output of the standard instrument and the output of the calibrated transformer are usually far away, and traditional error calibration methods cannot be applied.

Utility model content

The purpose of this utility model is to provide a wireless synchronous data acquisition device for the calibration of DC transformers in DC converter stations, to conduct wireless calibration tests on the accuracy of DC transformers, and to solve the problem of on-site calibration of DC transformers in DC converter stations. The problem of difficult field wiring.

The purpose of this new model is achieved in this way: a wireless synchronous data acquisition device for DC transformer calibration in DC converter stations, consisting of a master measuring device and a slave measuring device; the master measuring device is composed as follows:

The host wireless communication unit and the host GPS synchronous clock unit are respectively connected to the host, the input end of the host measurement unit is used as the secondary voltage signal introduced into the standard DC transformer, and the output end of the host measurement unit is connected to the signal input end of the host;

The above-mentioned slave measuring device is constituted as follows:

The slave wireless communication unit and the slave GPS synchronous clock unit are respectively connected to the slave, the input of the slave measurement unit is used as the secondary voltage signal introduced into the DC transformer to be calibrated, the output of the slave measurement unit is connected to the slave’s Signal input connection;

And the host GPS synchronous clock unit and the slave GPS synchronous clock unit are all synchronized with the satellite, the wireless communication unit of the host and the slave wireless communication unit are connected through a wireless network; the above-mentioned host measurement unit is composed of a voltage sensor and an A/D converter. connected; the slave measuring unit is composed of a slave voltage sensor and a slave A/D converter cascaded in sequence.

The wireless synchronous data acquisition device for calibrating DC transformers consists of a master measuring device and a slave measuring device. The host measurement device includes the host GPS synchronous clock unit, the host measurement unit, the host wireless communication unit, the host (control and data processing and error calculation); the slave measurement device mainly includes the slave GPS synchronous clock unit, the slave measurement unit, the slave (control and data processing) and slave wireless communication unit; the host GPS synchronous clock unit transmits the received clock signal to the host control and data processing unit, and the host control and data processing unit controls the host measurement unit to test and read data. The GPS synchronous clock unit of the slave machine transmits the received clock signal to the slave machine, and the slave machine performs control and data processing, controls the measurement unit of the slave machine to test and read data, and connects the slave machine to the wireless communication unit of the slave machine. The slave wireless communication unit is connected with the host wireless communication unit through a wireless network. The host wireless communication unit sends the received slave measurement data to the host for control, data processing and error calculation.

The beneficial effects of the utility model are: the utility model provides an effective method for calibrating the DC transformer of the converter station, which can carry out high-precision wireless testing of the DC transformer of the converter station, and solves the problem of the DC transformer of the converter station. The difficulty of on-site verification and wiring of transformers provides a basis for fault diagnosis and maintenance of DC transformers, and fills the gap in this field.

Description of drawings

Fig. 1 is the working principle block diagram of the utility model embodiment.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Marks in Figure 1: 1. Host GPS synchronous clock unit; 2. Host measurement unit; 3. Host wireless communication unit; 4. Host (control and data processing); 5. Error calculation unit; 6. Host measurement device; 7. Slave GPS synchronization clock unit; 8. Slave measurement unit; 9. Slave wireless communication unit; 10. Slave (control and data processing); 11. Slave measurement device.

Referring to Fig. 1, the present invention is made up of master measuring device 6 and slave measuring device 11; master measuring device 6 is constituted as follows:

The host wireless communication unit 3 and the host GPS synchronous clock unit 1 are respectively connected to the host 4, the input of the host measurement unit 2 is used as a secondary voltage signal for introducing a standard DC transformer, and the output of the host measurement unit is connected to the signal input of the host 4 terminal connection;

Above-mentioned slave measuring device 11 constitutes as follows:

Slave wireless communication unit 9 and slave GPS synchronous clock unit 7 are respectively connected with slave 10, and the input end of slave measurement unit 8 is used as the secondary voltage signal that introduces the DC transformer to be calibrated, and the output terminal of slave measurement unit Connect with the signal input end of slave machine 10;

And the host GPS synchronous clock unit 1 and the slave GPS synchronous clock unit 7 are all synchronized with the satellite, and the wireless communication unit 3 of the host and the slave wireless communication unit 9 are connected through a wireless network;

The master measuring unit 2 is composed of a voltage sensor and an A/D converter connected in sequence; the slave measuring unit 8 is composed of a slave voltage sensor and a slave A/D converter connected in sequence.

The master GPS synchronous clock unit 1 and the slave GPS synchronous clock unit 7 can be synchronized with satellites and provide world absolute time and second pulse signals. The synchronization accuracy of the rising edge of the pulse can reach dozens of ns, which can be guaranteed Synchronization of master-slave measurements.

The host measuring unit 2 receives the secondary output voltage signal of the standard DC transformer, converts it into a digital signal and transmits it to the host after A/D conversion. The slave measuring unit 8 can receive the secondary output voltage signal of the calibrated DC transformer, perform A/D conversion on it and transmit it to the slave 10 .

The host wireless communication unit 3 receives the measurement data sent by the slave wireless communication unit 9 through wireless network communication, and then transmits it to the host.

During specific implementation, the master measuring device 6 measures the signal output by the standard DC transformer, and the slave measuring device 11 measures the signal output by the calibrated DC transformer. The master GPS synchronous clock unit 1 and the slave GPS synchronous clock unit 7 are respectively synchronized with satellites, and output absolute time signals and second pulse synchronization signals to the master and slaves. The host controls the host measurement unit 2 to measure the output signal of the standard DC transformer and the output signal of the measured DC transformer according to the received clock signal; at the same time, the slave controls the slave measurement unit 8 to output the standard transformer according to the received clock signal signal to measure. The slave machine stamps the data collected by the slave machine measurement unit 8 with an absolute time mark and transmits it to the slave machine wireless communication unit 9 . The slave wireless communication unit 9 sends data to the master wireless communication unit 3 through the wireless network. The host wireless communication unit 3 transmits the received data to the host. The master reads the data measured by the master measuring unit 2, and marks it with absolute time, and then transmits the data measured by the master measuring unit 2 and the data measured by the slave measuring unit 8 to the error calculation unit 5, and the error calculation unit 5 compares the same The data at the time point is calculated by a certain algorithm to obtain the error of the calibrated DC transformer.

Claims (1)

1. a wireless synchronization data collector that is used for the verification of DC converter station direct current instrument transformer is characterized in that: be made up of main frame measurement mechanism (6) and slave measurement mechanism (11); Above-mentioned main frame measurement mechanism (6) is constructed as follows:

Main frame wireless communication unit (3) is connected with main frame (4) respectively with main frame GPS synchronous clock unit (1), the input end of main frame measuring unit (2) is as the secondary voltage signal of introducing the standard straight current transformer, and the output terminal of main frame measuring unit is connected with the signal input part of main frame (4);

Above-mentioned slave measurement mechanism (11) is constructed as follows:

Slave wireless communication unit (9) is connected with slave (10) respectively with slave GPS synchronous clock unit (7), the input end of slave measuring unit (8) is as introducing by the secondary voltage signal of alignment current transformer, and the output terminal of slave measuring unit is connected with the signal input part of slave (10);

And main frame GPS synchronous clock unit (1) and slave GPS synchronous clock unit (7) are all synchronous with satellite, and the wireless communication unit of main frame (3) is connected by wireless network with slave radio communication unit (9);

Above-mentioned main frame measuring unit (2) by voltage sensor, A/D converter in turn cascade form; Slave measuring unit (8) by slave voltage sensor, slave A/D converter in turn cascade form.