RU193828U1 - DEVICE FOR MEASURING VOLTAGE OF REGULATED INSTALLATION OF COMPENSATION OF REACTIVE POWER ON THE POST OF SECTION - Google Patents

Abstract

The utility model relates to measuring equipment in the field of railway transport and is intended to measure the voltage on the bus of the sectioning station in the absence of traction load on the inter-substation zone. The connection diagram of the device at the sectioning station on the inter-substation zone of the double-track section and the block diagram of the proposed device are shown in FIG. 1 and FIG. 2, respectively. The technical result is achieved by changing the set point of the adjustable compensating device in terms of voltage depending on the measured voltage value in the absence of traction load on the substation zone. The purpose of the utility model is to determine the voltage at the point of connection of adjustable transverse reactive power compensation units to select the operating mode and increase the effectiveness of their work. 2 ill.

Description

The utility model relates to measuring equipment in the field of railway transport and is intended to measure the voltage on the bus post sectioning in the absence of traction load on the inter-substation zone.

The purpose of the utility model is to determine the voltage at the point of connection of adjustable installations of transverse compensation of reactive power (RCC) to select a mode of operation and increase their efficiency.

The value of the voltage level in the absence of load on the inter-substation zone determines the ECG mode, on which its efficiency depends. The voltage setting determines the compensation mode of the inductive and capacitive nature of the load. Depending on the measured voltage level, the reactive current generated by the RCC is calculated. In order to reduce electricity losses in the traction network, the voltage setting in new types of switchgear at sectioning posts (PS) is taken to be equal to the voltage value in the absence of traction load on the inter-substation zone. Due to a change in the operating modes of the external power supply system, the transformation ratio of power step-down transformers of traction substations and other conditions leading to a change in the open-circuit voltage level at traction substations, it is necessary to periodically update the voltage setting value to increase the efficiency of the switchgear.

To implement this feature, a voltage measuring device is proposed in the absence of traction load on the inter-substation zone.

A device for measuring current and voltage in a high-voltage network is known, which contains primary large-scale current and voltage converters, analog-to-digital converters with an optical output for measured current and voltage signals, optical fibers for transmitting a signal about the measured current and voltage, a receiving device with an optical output for a signal current of the analog-to-digital converter connected on the high potential side and receiving power from a rapidly saturable current transformer, and the analog-to-digital converter A device with an optical output for a voltage signal on the low potential side and powered by an external power source [1]. The disadvantage of this device is the lack of the ability to simultaneously measure multiple values of currents at various connections and in no load conditions.

Closest to the claimed device is a digital electric current meter [2]. The specified device allows you to measure electric current in digital form based on the rotation of the moving coil of the primary transducer with its further conversion into an electrical signal, taking into account its scaling and digital coding with the desired technical result, i.e. increasing the accuracy of measuring electric current. The disadvantage of this device is the inability to measure voltage, automation of the measurement process and the need to involve an operator for automated measurements.

The proposed device allows you to measure the voltage at the sectioning station in the absence of traction load on the inter-substation zone by measuring the voltage when there is no traction load on the inter-substation zone.

The technical result is achieved by changing the settings of the switchgear for voltage depending on the measured voltage value in the absence of traction load.

The claimed results are achieved through the use of an open-circuit voltage measuring device containing four current transformers for two-way section conditions, the outputs of large-scale amplifiers of which are connected to two current-voltage converters connected to comparators, the signals from which are fed to the OR gate connected to an intermediate relay connected between the voltage transformer and one of the measuring ends of the voltage meter.

The connection diagram of the device at the sectioning station at the inter-substation zone of the double-track section and the structural diagram of the proposed device are shown in FIG. 1 and FIG. 2 respectively.

The device 1 (Fig. 1) is connected to the organs of the voltage measuring device (voltage transformers) 2, four current transformers 3 connections (switches Q1 - Q4, section switch Q5) of the PS section section connected to the contact suspensions of the 1st and 2nd ways sectioned by QS1, QS2 disconnectors and powered by traction substations TP-1 and TP-2 from the corresponding connections (Q7 - Q9).

The outputs of the large-scale amplifiers of the four current transformers TA1 - TA4 (Fig. 2) are connected to two current-voltage converters - 4 and 5, connected to the comparators 6 and 7, respectively, the signals from which are fed to the logic element "OR" 8 connected to the intermediate relay 9, connected to voltage transformer 2 and voltage meter 10.

Using the secondary windings of the current transformers TA1, TA2 and TA3, TA4 of the PS feeders (Fig. 2), the current differences I ₁ and I ₂ , I ₃ and I _{4 are} converted into proportional DC voltage values using measuring transducers 4 and 5, respectively. Comparators 6 and 7 monitor the signal levels at the outputs of converters 4 and 5. If the signal at the output of one of the converters exceeds the comparator response level, which indicates the presence of traction load on the overcurrent protection circuit, this comparator supplies voltage to the intermediate solenoid through the OR logic 8 relay 9, whose contacts open the secondary circuit of the voltage transformer 2, voltage meter 10 does not register zero values.

If the signals at the outputs of two converters 4 and 5 are lower than the response levels of the comparators 6 and 7, respectively, which indicates the absence of traction load on the MPZ, there is no signal at the output of the “OR” 8 logic circuit and voltage will not be supplied to the coil solenoid of the intermediate relay 9 and its contacts are in a normally closed state. The voltage meter 10 registers the voltage in the absence of traction load. Thus, when there is no load on the inter-substation zone, the voltage measurement stops, and when the load appears, it resumes.

The proposed device allows you to determine the voltage to select the operating characteristics of the control gear installed at the section posts of the traction power supply system of alternating current. The use of a voltage measuring device on the busbar of a sectioning station in the absence of traction load in the inter-substation zone allows reducing power losses in the traction network by adjusting the voltage setting and ensuring a reduction in the time for processing measurement data.

Bibliographic list

1. Pat. 2419563 of the Russian Federation, IPC G01R 19/25 (2006.01), G01R 15/00 (2006.01). Device for measuring current and voltage in a high-voltage network [Text] / S.I. Martsenyuk, A.S. Medvedev Applicant and patent holder of LLC Ay-Tor. - No. 2016118189/28; declared 05/10/2016; publ. 11/10/2016 bull. No. 31. - 4 p.: 2il.

2. Pat. 2680988 of the Russian Federation, IPC G01R 27/00 (2006.01), G01R 19/25 (2006.01). digital electric current meter [Text] / G.N. Akhobadze; Applicant and patent holder Federal State Budgetary Institution of Science Institute for Management Problems V.A. Trapeznikov Russian Academy of Sciences. - No. 2018106657; declared 02/22/2018; publ. 02/22/2018 bull. Number 7. - 4 p.: 1 ill.

Claims (1)

A voltage measuring device for an adjustable installation of reactive power compensation at a sectioning station, containing measuring transformers and current converters, characterized in that the secondary windings of the current transformers are connected in a differential circuit and connected to current converters connected to comparators, the signals from which are fed to the OR logic element "Connected to an intermediate relay, the contacts of which close the secondary circuit of the voltage transformer and voltage meter Ia performing voltage registration in the absence of tractive load.

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