CN111323699A - Method for evaluating service performance of transformer oil flow relay - Google Patents
Method for evaluating service performance of transformer oil flow relay Download PDFInfo
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- CN111323699A CN111323699A CN202010137929.4A CN202010137929A CN111323699A CN 111323699 A CN111323699 A CN 111323699A CN 202010137929 A CN202010137929 A CN 202010137929A CN 111323699 A CN111323699 A CN 111323699A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a method for evaluating service performance of an oil flow relay of a transformer. The method comprises the steps of firstly, building a comprehensive test platform for evaluating the service performance of the transformer oil flow relay, then testing the action oil flow, the return oil flow and the actual contact capacity of the oil flow relay, then calculating the action characteristic of the oil flow relay through the action oil flow and the return oil flow, calculating the performance parameter of the contact capacity of the oil flow relay through the contact capacity value, then obtaining the characteristic parameter for evaluating the service performance through the action characteristic of the oil flow relay and the contact capacity performance parameter, and finally evaluating the service performance of the oil flow relay through the characteristic parameter.
Description
Technical Field
The invention belongs to the field of performance evaluation of vehicle-mounted traction transformers, and particularly relates to a method for evaluating service performance of an oil flow relay of a transformer.
Background
The oil flow relay is an important device for protecting the vehicle-mounted traction transformer, the oil flow relay is used for monitoring the oil flow change condition of the transformer, oil flow is generated in an electric appliance connecting pipe after an oil pump is started, when the oil flow reaches a certain value (action oil flow), a movable plate in the relay rotates, an indicating part synchronously rotates through magnetic couple force, a signal contact is connected, a normal signal is sent out, when the oil flow is reduced to a certain value (return oil flow), the movable plate returns to send out a fault signal, an oil flow relay switch is closed, a closed loop is connected with a control system, and the vehicle-mounted traction transformer is cut off. Since the traction load has a large impact, the operating characteristics of the movable plate are also changed, thereby affecting the operating performance of the oil flow relay. When the oil flow is not enough, the oil flow relay cannot act in time, the heat dissipation of the vehicle-mounted traction transformer is not in time, hidden dangers are brought to the safe operation of the vehicle-mounted traction transformer, the safe operation of the vehicle-mounted transformer is vital to ensuring the normal operation of a train, and in order to reduce necessary accidents, an evaluation method capable of effectively judging the service performance of the oil flow relay is urgently needed.
Disclosure of Invention
A method for evaluating service performance of a transformer oil flow relay comprises the following steps:
the first step is as follows: comprehensive test platform for service performance evaluation of oil flow relay of built transformer
A comprehensive test platform for evaluating service performance of a transformer oil flow relay is built, the test platform mainly comprises an oil flow relay (1), an indicating device (2), a motor (3), an oil conveying pipe (4), a standard flowmeter (5), an oil tank (6), transformer oil (7), a valve (8), a 220V alternating current power supply (9), an ammeter (10), a lead (11), a lower end oil outlet (12) and an upper end oil inlet (13), the valve (8) is 10cm away from the lower end oil outlet (13), the valve (8) is closed, the transformer oil (7) is filled in the oil tank (6), the liquid level of the transformer oil (7) is located at 3/4 of the height of the oil tank (6), the valve (8) is opened, the transformer oil (7) flows into the oil conveying pipe (4) through the lower end oil outlet (12), passes through the motor (3), the standard flowmeter (5) and the oil flow relay (1), the standard flowmeter (5) displays the oil flow of transformer oil (7) in the oil conveying pipe (4), the 220V alternating current power supply (9) is connected with the oil flow relay (1), the indicating device (2) and the ammeter (10) through a lead (11) to form a loop, the ammeter (10) displays the real-time current value of the oil flow relay (1), and the indicating device (2) displays the working state of the oil flow relay (1) and sends a corresponding signal;
the second step is that: parameter measurement
Testing the operating oil flow Q of an oil flow relaydFlow rate Q of return oiltAnd power ScEach 5 times is denoted as Qd,i、Qt,i、Sc,iAnd i represents the test times, and takes the values of 1, 2, 3, 4 and 5;
a 220V alternating current power supply (9) is connected, the motor (3) is started, the valve (8) is adjusted to increase the transformer oil flow until the oil flow relay (1) acts and the indicating device (2) sends a normal working signal, the indication number of the standard flowmeter (5) at the moment is recorded and recorded as the acting oil flow Qd,,iUnit is m3H; and (3) regulating the valve (8) again to reduce the oil flow of the transformer until the oil flow relay (1) acts and the indicating device (2) sends out a fault signal, recording the reading of the standard flowmeter (5) at the moment, and recording the reading as the return oil flow QtIn the unit of m3/hi(ii) a Recording the current value flowing through the ammeter (10) for the ith time as Ic,iCalculating the contact capacity S of the ith oil flow relayc,i：
Sc,i＝220Ic,i(1)
Third, determining the action characteristic η of the oil flow relay:
in the formula, QdminThe minimum value of the oil flow relay is expressed in m3H, which is determined according to the nominal pipe diameter r of the oil flow relay (1) and satisfies the following functional relation:
Q0the rated oil flow of the oil flow relay is shown in m3H, which is determined according to the nominal pipe diameter r of the oil flow relay (1) and satisfies the following functional relation:
the specific rated oil flow value is determined according to a nameplate of the oil flow relay;
the fourth step: performance parameter lambda for determining the contact capacity of an oil flow relay
Calculating a performance parameter λ of the contact capacity:
in the formula I0Rated current of the oil flow relay;
the fifth step: determining characteristic parameter epsilon of service performance of oil flow relay
Calculating a service performance characteristic parameter epsilon of the oil flow relay:
and a sixth step: service performance assessment
Calculating characteristic parameter epsilon of transformer oil flow relay to be evaluated0When epsilon0When the service performance of the oil flow relay is more than or equal to 0.8, the service performance of the oil flow relay is excellent; when 0.5<ε0<When 0.8 hour, the oil flow relay has good service performance, and the oil flow relay is considered to be replaced; when epsilon0When the service performance of the oil flow relay is less than or equal to 0.5, the oil flow relay is immediately replaced.
The invention has the advantages that:
the invention provides a method for evaluating service performance of an oil flow relay of a transformer, according to the experimental method disclosed by the invention, a test system is firstly set up, then characteristic parameters such as action oil flow, return oil flow, power and the like are obtained through experiments, action characteristics are calculated according to the action oil flow and the return oil flow, performance parameters of the power are calculated according to the power characteristic quantity, the service performance characteristic parameters are calculated according to the action characteristics and the performance parameters of the power, the service performance of the oil flow relay is evaluated through the service performance characteristic parameters, and the evaluation of the service performance of the oil flow relay of the transformer is effectively improved through the experiments.
Drawings
Fig. 1 is a flow chart for evaluating service performance of an oil flow relay of a transformer.
Fig. 2 is a schematic diagram of an experimental platform for testing service performance of an oil flow relay of a transformer.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
fig. 2 is a schematic diagram of an experimental platform for testing service performance of an oil flow relay of a transformer. Fig. 1 shows that an experimental method for evaluating service performance of a transformer oil flow relay includes the following steps:
the first step is as follows: comprehensive test platform for service performance evaluation of oil flow relay of built transformer
A comprehensive test platform for evaluating service performance of a transformer oil flow relay is built, the test platform mainly comprises an oil flow relay (1), an indicating device (2), a motor (3), an oil conveying pipe (4), a standard flowmeter (5), an oil tank (6), transformer oil (7), a valve (8), a 220V alternating current power supply (9), an ammeter (10), a lead (11), a lower end oil outlet (12) and an upper end oil inlet (13), the valve (8) is 10cm away from the lower end oil outlet (13), the valve (8) is closed, the transformer oil (7) is filled in the oil tank (6), the liquid level of the transformer oil (7) is located at 3/4 of the height of the oil tank (6), the valve (8) is opened, the transformer oil (7) flows into the oil conveying pipe (4) through the lower end oil outlet (12), passes through the motor (3), the standard flowmeter (5) and the oil flow relay (1), the standard flowmeter (5) displays the oil flow of transformer oil (7) in the oil conveying pipe (4), the 220V alternating current power supply (9) is connected with the oil flow relay (1), the indicating device (2) and the ammeter (10) through a lead (11) to form a loop, the ammeter (10) displays the real-time current value of the oil flow relay (1), and the indicating device (2) displays the working state of the oil flow relay (1) and sends a corresponding signal;
the second step is that: parameter measurement
Testing the operating oil flow Q of an oil flow relaydFlow rate Q of return oiltAnd power ScEach 5 times is denoted as Qd,i、Qt,i、Sc,iAnd i represents the test times, and takes the values of 1, 2, 3, 4 and 5;
a 220V alternating current power supply (9) is connected, the motor (3) is started, the valve (8) is adjusted to increase the transformer oil flow until the oil flow relay (1) acts and the indicating device (2) sends a normal working signal, the indication number of the standard flowmeter (5) at the moment is recorded and recorded as the acting oil flow Qd,iUnit is m3H; and (3) regulating the valve (8) again to reduce the oil flow of the transformer until the oil flow relay (1) acts and the indicating device (2) sends out a fault signal, recording the reading of the standard flowmeter (5) at the moment, and recording the reading as the return oil flow Qt,iUnit is m3H; recording the current value flowing through the ammeter (10) for the ith time as Ic,iCalculating the contact capacity S of the ith oil flow relayc,i：
Sc,i＝220Ic,i(1)
Third, determining the action characteristic η of the oil flow relay:
in the formula, QdminThe minimum value of the oil flow relay is expressed in m3H, which is determined according to the nominal pipe diameter r of the oil flow relay (1) and satisfies the following functional relation:
Q0the rated oil flow of the oil flow relay is shown in m3H, which is determined according to the nominal pipe diameter r of the oil flow relay (1) and satisfies the following functional relation:
the specific rated oil flow value is determined according to a nameplate of the oil flow relay;
the fourth step: performance parameter lambda for determining the contact capacity of an oil flow relay
Calculating a performance parameter λ of the contact capacity:
in the formula I0Rated current of the oil flow relay;
the fifth step: determining characteristic parameter epsilon of service performance of oil flow relay
Calculating a service performance characteristic parameter epsilon of the oil flow relay:
and a sixth step: service performance assessment
Calculating characteristic parameter epsilon of transformer oil flow relay to be evaluated0When epsilon0When the service performance of the oil flow relay is more than or equal to 0.8, the service performance of the oil flow relay is excellent; when 0.5<ε0<When 0.8 hour, the oil flow relay has good service performance, and the oil flow relay is considered to be replaced; when epsilon0When the service performance of the oil flow relay is less than or equal to 0.5, the oil flow relay is immediately replaced.
Claims (1)
1. The method for evaluating the service performance of the transformer oil flow relay is characterized by comprising the following steps of:
the first step is as follows: comprehensive test platform for service performance evaluation of oil flow relay of built transformer
A comprehensive test platform for evaluating service performance of a transformer oil flow relay is built, the test platform mainly comprises an oil flow relay (1), an indicating device (2), a motor (3), an oil conveying pipe (4), a standard flowmeter (5), an oil tank (6), transformer oil (7), a valve (8), a 220V alternating current power supply (9), an ammeter (10), a lead (11), a lower end oil outlet (12) and an upper end oil inlet (13), the valve (8) is 10cm away from the lower end oil outlet (13), the valve (8) is closed, the transformer oil (7) is filled in the oil tank (6), the liquid level of the transformer oil (7) is located at 3/4 of the height of the oil tank (6), the valve (8) is opened, the transformer oil (7) flows into the oil conveying pipe (4) through the lower end oil outlet (12), and flows into the oil tank (6) through the motor (3), the standard flowmeter (5), the standard flowmeter (5) displays the oil flow of transformer oil (7) in the oil conveying pipe (4), the 220V alternating current power supply (9) is connected with the oil flow relay (1), the indicating device (2) and the ammeter (10) through a lead (11) to form a loop, the ammeter (10) displays the real-time current value of the oil flow relay (1), and the indicating device (2) displays the working state of the oil flow relay (1) and sends a corresponding signal;
the second step is that: parameter measurement
Testing the operating oil flow Q of an oil flow relaydFlow rate Q of return oiltAnd power ScEach 5 times is denoted as Qd,i、Qt,i、Sc,iAnd i represents the test times, and takes the values of 1, 2, 3, 4 and 5;
a 220V alternating current power supply (9) is connected, the motor (3) is started, the valve (8) is adjusted to increase the transformer oil flow until the oil flow relay (1) acts and the indicating device (2) sends a normal working signal, the indication number of the standard flowmeter (5) at the moment is recorded and recorded as the acting oil flow Qd,i,Unit is m3H; and (3) regulating the valve (8) again to reduce the oil flow of the transformer until the oil flow relay (1) acts and the indicating device (2) sends out a fault signal, recording the reading of the standard flowmeter (5) at the moment, and recording the reading as the return oil flow Qt,iUnit is m3H; recording the current value flowing through the ammeter (10) for the ith time as Ic,iCalculating the contact capacity S of the ith oil flow relayc,i：
Sc,i＝220Ic,i(1)
Third, determining the action characteristic η of the oil flow relay:
in the formula, QdminThe minimum value of the oil flow relay action is represented, the value is determined according to the nominal diameter r of the pipeline of the oil flow relay (1), and the following functional relation is satisfied:
Q0indicating the rated oil flow of the oil flow relay, the value being based onThe nominal diameter r of the pipeline of the oil flow relay (1) is determined and meets the following functional relation:
the specific rated oil flow value is determined according to a nameplate of the oil flow relay;
the fourth step: performance parameter lambda for determining the contact capacity of an oil flow relay
Calculating a performance parameter λ of the contact capacity:
in the formula I0Rated current of the oil flow relay;
the fifth step: determining characteristic parameter epsilon of service performance of oil flow relay
Calculating a service performance characteristic parameter epsilon of the oil flow relay:
and a sixth step: service performance assessment
Calculating characteristic parameter epsilon of transformer oil flow relay to be evaluated0When epsilon0When the service performance of the oil flow relay is more than or equal to 0.8, the service performance of the oil flow relay is excellent; when 0.5<ε0<When 0.8 hour, the oil flow relay has good service performance, and the oil flow relay is considered to be replaced; when epsilon0When the service performance of the oil flow relay is less than or equal to 0.5, the oil flow relay is immediately replaced.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577878A (en) * | 2020-12-02 | 2021-03-30 | 西南交通大学 | Service performance evaluation method for transformer respirator |
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Cited By (2)
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| CN111323699B (en) | 2021-04-20 |
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