RU2281518C2 - Method for direct measuring of energy, consumed by electricity-driven train from direct-current driving network - Google Patents

Abstract

FIELD: electric engineering, possible usage in driving networks of direct current for main and local railroads, industrial transport, metropolitans and city transport.

SUBSTANCE: for case of direct energy distribution, amount of energy and number of ampere-hours is recorded on all electricity-driven train units. Simultaneously with that, amount of energy and amount of ampere-hours is recorded on all feeders of contact network of driving sub-stations. Actual amount of energy consumed by all electricity-driven train units is determined by using appropriate formulae. For increased precision and comfort of calculations, recording of energy and ampere-hours is performed by special complex indicators.

EFFECT: increased precision of measuring of amount of electric energy, consumed by electricity-driven train from driving network of direct-current, even in case when not all electricity-driven trains are equipped with energy counters; sufficiently precise measuring of energy losses in driving networks.

2 cl, 1 dwg

Description

The invention relates to electrical engineering and can be used in DC traction networks of main and suburban railways, industrial transport, subways and public transport. The need to determine the energy consumed by electric rolling stock (EPS) is determined by the need to carry out calculations with transport power engineers for the received EPS.

The currently widely used method for determining the energy (l-1,2) consumed by EPS using the direct current railway network consists in fixing this energy with energy meters installed on EPS. However, as practice shows, for various objective reasons, energy meters are usually not installed on all EPS units or some of them are inoperative. Because of this, the difference between the energy recorded by the meters on the feeders of the contact network of the traction substations (released to the traction network) and the energy recorded by the ESR meters (supposedly actually consumed by the ESR) turns out to be much larger than the possible energy losses in the traction network. These thus defined and clearly inflated energy losses in the traction network in the practice of operation of electrified railways began to be called conditional energy losses.

Until now, while MPS was generally paid for all of its business entities, the knowledge of the true amount of energy consumed by EPS and lost in the traction network did not really interest anyone. However, now, after the reform of the Ministry of Railways and the creation of Russian Railways, i.e. in the conditions when each business entity will be interested in paying the cost of only the energy expended by them, it is necessary to create a new energy metering system that would allow transport power engineers to control the energy metering system at EPS, and EPS operators - a metering system for transport power engineers, and all together determine the true energy losses in the traction network, the cost of which, obviously, will be paid by transport power engineers.

The prototype (L-1,2) is taken from the method of determining the energy consumed by EPS from the DC traction network (see above) that is currently widely used on DC roads.

The technical result of the claimed object is the most accurate determination of the amount of energy consumed by the EPS from the DC traction network, even if not all EPS units are equipped with energy meters, and, as a result, a fairly accurate determination of energy losses in the traction network. To achieve this technical result, it is proposed to use a new method for directly determining the energy consumed by EPS from a DC traction network.

The inventive method is illustrated in the drawing, which shows a schematic diagram of measurements of the quantities necessary to determine the energy consumed by the EPS from the DC traction network, where 1 is the switch of the feeder of the contact network; 2 and 3 - complex meters installed respectively on the feeder of the contact network and on the part of the EPS units and fixing the Amper hours and energy released into the traction network [(А · hour _tf ) and (В · А · hour _tf )] and received by the units of EPS [ (А · hour of _{EPS ZAM} ) and (В · А · hour of _{EPS ZAM} )]; 4 - EPS units equipped with complex meters; 5 - EPS units not equipped with complex meters.

The essence of the proposed method for the direct determination of the energy consumed by EPS from the traction network (V · A · h of _EPS ) is to fix this energy by meters installed on the EPS and, at the same time, by meters on all feeders of the contact network of traction substations. The latter fix the energy released by transport power engineers into the traction network (V · A · h of the _vehicle ). However, besides this, on all units of EPS, and on all feeders of the contact network, special counters are additionally installed, fixing respectively Ampere hours received by all units of EPS (A · hour of _EPS ) and released into the traction network (A · hour of the _vehicle ). The meaning of the simultaneous fixation of both energy and Amper hour allows transport power engineers and EPS operators to mutually control the energy metering systems organized by them, since, as follows from the rules of elementary electrical engineering, with perfectly organized energy metering systems, i.e. when both energy meters and Ampere hour meters are installed on all EPS units and on all feeders of the traction network, Ampere hours delivered by transport power engineers to the traction network (А · _vehicle hour) should be exactly equal to Ampere hours received by all EPS units (А · hour _EPS ), i.e. equality must be observed

If this equality is observed in reality, then this indicates that the metering system for the energy consumed by the EPS is perfectly organized, and in this case, the operators of the EPS are entitled to pay the cost of only the energy that is recorded by their energy meters, i.e. (In · And · hour of _EPS ).

If this equality is not observed, but there is an inequality in which the Ampere hours measured on EPS units (A · _{ES XAM} ) are less than Amp hours released by transport power engineers to the traction network (A · _vehicle hour), i.e. if there is a relation

(A · hour _{EPS ZAM} ) <(A · hour _TS ),

this suggests that the energy metering system at the EPS is not perfect and the energy meters are obviously not installed on all units of the EPS or some of them are inoperative. However, in this case, the actual amount of energy consumed by all units of EPS (B · A · hour _EPS ) is easily determined from the proportional equality

where from

Based on the measurements obtained, it is easy to determine the amount of energy loss in the traction network Δ (V · A · h of the _vehicle ). Obviously it is equal

To ensure accurate measurements showing the correspondence of Amp hours and energy, their measurement on EPS units and on the feeders of the traction network should be carried out synchronously in time, with the necessary time marks, with the same high accuracy, which is most easily implemented in the design of a complex measuring device (special counter), which records both energy and Ampere hours for equal periods of time.

The implementation of a comprehensive measuring device can be performed on the basis of microprocessor protection of feeders for a 3.3 kV DC contact network BZ-M1 (l-3). The hardware of the BZ-M1 protection fully meets the requirements for the design and functional responsibilities of an integrated measuring device. The flexible software part of the BZ-M1 protection is either supplemented by the functions of fixing energy and Ampere hours, or is simplified to perform only fixing energy and Ampere hours. In the latter case, the BZ-M1, simplifying, turns into a complex measuring device (special counter).

Information sources

1. Electrification is the basis of the technical re-equipment of the October Railway. The collection of materials of the scientific-practical conference dedicated to the 75th anniversary of the electrification of Russian railways, September 23-24, 2004, (p.110-113) Russian Railways branch OZhD, Publishing House OM-Press, St. Petersburg , 2004 - 128 s.

2. Certificate for utility model No. 19327 of 08/02/2001.

3. Grechishnikov V.A., Pupynin V.N. Experience in the development and operation of microprocessor protection units for 3.3 kV DC feeders. "ELECTRO", 2004, No. 1, pp. 29-35.

Claims (2)

1. A method for directly determining the energy consumed by electric rolling stock (EPS) from a DC traction network, which consists in fixing this energy with energy meters installed presumably on all EPS units, characterized in that in addition to this, the number of amperes recorded on these EPS units is also recorded -hours and, in addition, record the amount of energy and ampere-hours released to the traction network for all feeders of the contact network, while the amount of energy actually consumed by all EPS units is based on observance of the indispensable equality of ampere hours allocated to the traction network by feeders of the contact network and received by all EPS units, according to the formula (V · A · hour _eps ) = (V · A · hour _eps ) · (A · hour _ts ) / (А · hour _eps ) where (В · А · hour _eps ) - the total amount of energy received by units of EPS measured by their counters; (A · hour _tf ) and (A · hour _eps ) - respectively, the number of ampere-hours released by the feeders of the traction network and received by EPS units recorded by their ampere-hour counters. 2. A method for directly determining the energy consumed by an electric rolling stock (EPS) from a DC traction network according to claim 1, characterized in that in order to increase the accuracy and convenience of calculations, the fixation of both energy and ampere hours both on the feeders of the traction network and on units of EPS, is performed synchronously with the necessary timestamps by special complex counters.