CN202230321U - Timing and time keeping accuracy test system - Google Patents

Abstract

The utility model discloses a timing and time keeping accuracy test system comprising a merging unit (1), a high-accuracy time tester (2) and a GPS (global positioning system) synchronous timing device (3), wherein antennae (5) of the high-accuracy time tester (2) and the GPS synchronous timing device (3) are arranged outdoors; a B code timing output port (8) of the GPS synchronous timing device (3) is connected with a timing input port (9) of the merging unit (1); a sampling value optical fiber output port (10) of the merging unit (1) is connected with a sampling value optical fiber input port (11) of the high-accuracy time tester (2); and an output port (7) of sampling value output equipment (4) is connected with a sampling value input port (6) of the merging unit (1). By adopting the timing and time keeping accuracy test system disclosed by the utility model, the problem that a common user has difficulty in testing the timing and time keeping accuracies of the merging unit is solved, the test system is simple and convenient to operate, and the efficiency is improved.

Description

A kind of to the time and punctual accuracy test system

Technical field:

The utility model relates to digital transformer substation testing of equipment field.

Background technology:

The time synchronization problem of digital transformer substation is the major issue that digital transformer substation need solve; Wherein merge cells to the time and punctual precision be directly connected to the synchronism of the sampled value at full station; Also influence simultaneously the correctness of the logic determines of miscellaneous equipment; Therefore be combined the unit to the time with punctual accuracy requirement than higher, generally to the time accuracy requirement less than 1 μ s, punctual precision is less than 24 μ s.The sampled value message of merge cells output is according to the IEC61850 stipulations, and the sampled value message is not with temporal information.In test, also can't know transmit messages the literary composition zero-time, this cause merge cells to the time with punctual precision be difficult to the detection.At present; Merge cells to the time and punctual test generally be the manufacturer of merge cells in the laboratory through other method test; Such as on merge cells, increasing a time output interface; Through the split-second precision tester receive temporal information that merge cells sends confirm to the time precision and punctual precision; Or utilize the time test appearance to measure the pulse per second (PPS) or the time synchronized pulse of 1 time frequency measurement merge cells time delivery outlet output with per second, again and the pps pulse per second signal of standard clock source output effectively along (rising edge or negative edge) the absolute value delta t of the mistiming between them relatively, through continuous coverage 1 minute; The maximal value of the Δ t that records during this period of time is final testing result, draw merge cells to the time and punctual precision result test result.

But above-mentioned method does not have ubiquity; A lot of merge cells manufacturers do not provide time output interface or time delivery outlet not open to domestic consumer; Cause the user be combined the unit to the time and the test of punctual precision difficulty, good without comparison at the scene means of testing.

Summary of the invention

The content of the utility model:

The technical matters that the utility model will solve:

The utility model provide a kind of to the time and punctual accuracy test system; Solve that merge cells manufacturer does not provide the time output interface or the time output interface that provides is open to domestic consumer, cause the user be combined the unit to the time with the difficult problem of punctual accuracy test.

The utility model technical scheme:

A kind of to the time and punctual accuracy test system, comprise merge cells, split-second precision tester and GPS synchronously to the time device; Split-second precision tester and GPS synchronously to the time device antenna place the open air; GPS synchronously to the time device the B sign indicating number to the time delivery outlet and merge cells to the time input port link to each other; The sampled value optical fiber delivery outlet of merge cells is connected with the sampled value optical fiber input port of split-second precision tester; The delivery outlet of sampled value output device is connected with the sampled value input port of merge cells.

The delivery outlet of sampled value output device is connected with the sampled value input port of merge cells, and is different according to the type of merge cells, can be connected through optical fiber or lead.

The beneficial effect of the utility model: through this to the time and punctual accuracy test system; Do not need merge cells that additional time output interface is provided; Only need to use the original sampled value delivery outlet of merge cells; Send sampled value and the sampled value message transmissions form of merge cells is set to merge cells through the sampled value output device, receive the sampled value message that transfers from merge cells, and note and receive each frame message time constantly by the split-second precision tester; Through mathematical operation just can test out merge cells to the time and punctual precision.The utility model has solved that merge cells manufacturer does not provide the time output interface or the time output interface that provides is open to domestic consumer, cause the user be combined the unit to the time with the difficult problem of punctual accuracy test, this system operation is easy, raise the efficiency.

Description of drawings:

Fig. 1 is the utility model principle schematic.

Embodiment:

As shown in Figure 1: this to the time and punctual accuracy test system, comprise merge cells 1, split-second precision tester 2, GPS synchronously to the time device 3 and sampled value output device 4; Connect GPS synchronously to the time device 3 and split-second precision tester 2 antenna 5 place the open air; GPS synchronously to the time device 3 the B sign indicating number to the time delivery outlet 8 through lead and merge cells 1 to the time input port 9 link to each other; The sampled value optical fiber delivery outlet 10 of merge cells 1 and the sampled value optical fiber input port of split-second precision tester 2 11 are connected through optical fiber; Sampled value output device 4 refers to be combined the protection tester of unit 1 direct dosage or the sampled value of coming from electric mutual inductor etc. can be combined the unit 1 directly equipment or the system of transmission sampled value.The delivery outlet 7 of sampled value output device 4 is connected with the sampled value input port 6 of merge cells 1, and is different according to the type of merge cells, can be connected through optical fiber or lead.

After more than connect accomplishing, with merge cells 1, split-second precision tester 2, GPS synchronously to the time device 3, and the power supply of sampled value output device 4 connect and opening power and each device switch.

By the time split-second precision tester 2 and GPS synchronously to the time device 3 receive gps signal and stable after, generally need half an hour, could begin test.

Sampled value output device 4 sends sampled value and the sampled value message transmissions form of merge cells is set to merge cells 1, adopts IEC61850-9-1 or adopts the IEC61850-9-2 form.

Split-second precision tester 2 receives the sampled value message that transfers from merge cells 1; And note the time when receiving each frame message; The sampled value message that sends from merge cells 1; 1s sends 4000 points, every frame period 250 μ s, and can send zero second sampled value message during the per second zero clearing.

Part below the second of the time of noting when usefulness receives the sampled value message is divided by 250 μ s, and getting its remainder is t.Such as the time that receives message be 16: 40: 25.100250320 on the 5th January in 2011, get 0.100250320s, getting its remainder divided by 250 μ s is 0.320 μ s, i.e. t=0.320 μ s;

Calculate all t, be respectively t ₁, t ₂, t ₃...,, subscript 1,2,3 ... .. represent the 1st frame message respectively, the 2nd frame message, the 3rd frame message ... Calculate its mean value

N is a frame number of noting sampled value in the formula, and n should choose The more the better, at least greater than 4000, chooses about 20000 for general one group, in different time sections, chooses several groups of data and analyzes;

Calculating mean value and t ₁, t ₂, t ₃..., difference Vt '.

${\mathrm{Vt}}_1^{\′}={\mathrm{Vt}}_1-V\stackrel{\_}{t};$ ${\mathrm{Vt}}_2^{\′}={\mathrm{Vt}}_2-V\stackrel{\_}{t};$ ${\mathrm{Vt}}_3^{\′}={\mathrm{Vt}}_3-V\stackrel{\_}{t}...$

If Vt ' ₁, Vt ' ₂, Vt ' ₃In have>=1 μ s or≤this merge cells of-1 μ s explanation to the time precision do not reach requirement less than 1 μ s, just precision is defective during 1 pair of merge cells;

Begin to test the punctual precision of merge cells 1 below, with GPS synchronously to the time device 3 and merge cells 1 the lead 6 that is connected break off, begin test after 1 hour;

Send sampled value through sampled value output device 4 to merge cells 1.And the sampled value message transmissions form of merge cells 1 is set.Adopt IEC61850-9-1 or adopt the IEC61850-9-2 form;

Split-second precision tester 2 receives sampled value IEC61850-9-1 or the IEC61850-9-2 message that transfers from merge cells 1, and notes and receive each frame message time constantly;

Part below the second of the time of noting when usefulness receives the sampled value message is divided by 250 μ s, and getting its remainder is t.Such as the time that receives message be 16: 40: 25.100250320 on the 5th January in 2011, get 0.100250320s, getting its remainder divided by 250 μ s is 0.320 μ s, i.e. t=0.320 μ s;

Calculate all t, be respectively t1, t2; t3 ..., subscript 1,2; 3 ... .. represent the 1st frame message respectively; The 2nd frame message, the 3rd frame message ... Calculate that n is a frame number of noting sampled value in its mean value

formula, n should choose The more the better; At least greater than 4000, choose about 20000 for general one group.In different time sections, choosing several groups of data analyzes;

Calculating mean value and t1, t2, t3 ... Difference Vt '.

${\mathrm{Vt}}_1^{\′}={\mathrm{Vt}}_1-V\stackrel{\_}{t};$ ${\mathrm{Vt}}_2^{\′}={\mathrm{Vt}}_2-V\stackrel{\_}{t};$ ${\mathrm{Vt}}_3^{\′}={\mathrm{Vt}}_3-V\stackrel{\_}{t}...$

If Vt ' ₁, Vt ' ₂, Vt ' ₃In have greater than 24 μ s or less than-24 μ s, explain that this merge cells 1 punctual precision does not reach the requirement less than 24 μ s, just the punctual precision of merge cells 1 is defective.

Claims (2)

1. One kind to the time and punctual accuracy test system, comprise merge cells (1), split-second precision tester (2) and GPS synchronously to the time device (3); Split-second precision tester (2) and GPS synchronously to the time device (3) antenna (5) place the open air; GPS synchronously to the time device (3) the B sign indicating number to the time delivery outlet (8) with merge cells (1) to the time input port (9) link to each other; It is characterized in that: the sampled value optical fiber delivery outlet (10) of merge cells (1) is connected with the sampled value optical fiber input port (11) of split-second precision tester (2); The delivery outlet (7) of sampled value output device (4) is connected with the sampled value input port (6) of merge cells (1).
2. According to claim 1 said a kind of to the time and punctual accuracy test system; It is characterized in that: the delivery outlet (7) of sampled value output device (4) is connected different according to the type of merge cells with the sampled value input port (6) of merge cells (1), can be connected through optical fiber or lead.