GB/T 3319-2015Confirmation of the rated output of electric locomotives and electric multiple units (English PDF)

2.1 Rated output

The rated power of electric locomotives and electric multiple units indicates the output

power measured on the wheelsets in the following two cases.

--- The maximum output power that can be provided within a defined time interval

(at least 5min from the cold state);

--- Nominal power, namely continuous power.

However, it shall be emphasized that the power value obtained here shall not be

regarded as a basis for comprehensively judging the tractive effort of these electric

locomotives and electric multiple units; the evaluation of tractive effort still needs

considering other factors.

NOTE. before the issuance of corresponding standards, the measured value indicates the value

measured at the rated voltage of power network.

2.2 Electric multiple units

It includes one set of locomotive at least, also indicates the minimum independent unit

where the multi-unit train is inseparable during the running period.

2.3 Continuous tractive effort

When the main controller of electric locomotives and electric multiple units is at the

D – actually-measured value of dynamic wheel diameter, in mm;

D' – wheel diameter when dynamic wheel half-worn, in mm;

F' – in the constant power working condition of locomotives, the actually-measured

vehicle hook traction force, in kN;

M – calculated service weight of locomotives, in t;

w – total unit running resistance of locomotives at the corresponding speed, in N/kN.

4.1.3 Reducing calculus of continuous tractive effort of electric multiple units

wheel circumference

The continuous tractive effort (F) of wheel circumference, when wheel diameter is half-

worn, shall be calculated as per Formula (4).

Where.

P – train weight, in t;

g – gravity acceleration, in m/s2;

wo – unit running additional resistance, in N/kN;

wr – unit curve additional resistance, in N/kN;

wi – unit slope additional resistance, in N/kN;

wa – unit accelerative force, in N/kN.

Thereof, wa shall be calculated as per Formula (5).

Where.

v – train speed, in km/h;

t – time, in s.

4.1.4 Reducing calculus of continuous running speed

4.1.4.1 For step voltage-regulating electric locomotive, the speed shall be calculated

to the one when voltage of power network is 25kV, and wheel diameter is half-worn as

per Formula (6).

T – measuring time, in min;

u(t) – the instantaneous value of the primary voltage at the test speed point, in V;

i(t) – the instantaneous value of the primary current at the test speed point, in A.

5.1 The error of equipment and system required for the measurement of electric

locomotive are as follows.

a) Use the test vehicle equipped with dynamometer;

b) Vehicle hook force measuring system, the system error shall be no greater than

0.5%;

c) Running speed measuring system, the system error shall be no greater than

0.5%;

d) Electrical parameter measuring system, the system error shall be no greater than

0.5%.

5.2 The error of equipment and system required for the measurement of electric

multiple units are as follows.

a) Running speed measuring system, the system error shall be no greater than

0.5%;

b) Electrical parameter measuring system, the system error shall be no greater than

0.5%.

5.3 The used equipment shall be qualified by the verification of the state legal

measuring organization, and within the valid period.

6.1 The electric locomotive data that need to be measured are as follows.

a) Vehicle hook tractive effort, in kN;

b) Diameter of dynamic wheel, in mm;

c) Service weight of electric locomotives, in t;

d) Running speed, in km/h;

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