CN211014554U

CN211014554U - Protection device outlet relay contact action detection device

Info

Publication number: CN211014554U
Application number: CN201921938595.XU
Authority: CN
Inventors: 邹巍; 彭蓉
Original assignee: Datang Shimen Power Generation Co Ltd
Current assignee: Datang Shimen Power Generation Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-07-14
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a protection device outlet relay contact action detection device, which comprises a signal output module and more than one detection module, wherein the signal output module and each detection module are connected in series to form a detection loop; each detection module is used for putting a group of protection device outlet relay contacts to be detected into or withdrawing from the detection loop; each detection module comprises a selection switch and two binding posts; the selection switch is used for connecting or cutting out the two binding posts into the detection loop, and the two binding posts are used for connecting a group of outlet relay contacts of the protection device to be detected. The utility model discloses detection efficiency is high, and is with low costs.

Description

Protection device outlet relay contact action detection device

Technical Field

The utility model relates to a protection device export relay contact action detection device.

Background

An electric power company needs to regularly check whether an outlet relay contact inside a protection device (including a generator-transformer group protection cabinet and a busbar differential protection cabinet) of the electric power company operates correctly (correctness of a generator-transformer group/busbar differential protection outlet mode), and a traditional checking method comprises the following steps: (1) the universal meter is used for measuring the outlet relay contacts in the generator-transformer unit protection cabinet and the busbar differential protection cabinet, and the method not only consumes time and has low efficiency, but also is easy to make mistakes; (2) because each outlet relay contact inside the generator-transformer group protection cabinet/busbar differential protection cabinet corresponds to one circuit breaker or switch outside (such as a generator-transformer group) (namely, the action of the outlet relay contact can control the corresponding circuit breaker or switch to act), the circuit breaker or switch can be directly driven by the generator-transformer group protection cabinet/busbar differential protection cabinet to check whether the outlet relay contacts inside the generator-transformer group protection cabinet and the busbar differential protection cabinet act correctly, and the service life of the actual circuit breaker or switch in the generator-transformer group can be shortened by the method; (3) considering that the service life of the actual circuit breaker or switch in the generator-transformer unit can be prolonged by the method (2), at present, a detection method is to purchase a complete set of simulation circuit breakers, and check whether the outlet relay contact inside the generator-transformer unit protection cabinet/busbar differential protection cabinet acts correctly through the transmission simulation circuit breaker of the generator-transformer unit protection cabinet/busbar differential protection cabinet.

Therefore, it is necessary to design a new protection device outlet relay contact operation detection device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a protection device outlet relay contact action detection device to the not enough of prior art, the utility model discloses detection efficiency is high, and is with low costs.

The utility model provides a technical scheme does:

a protection device outlet relay contact action detection device comprises a signal output module and more than one detection module, wherein the signal output module and each detection module are connected in series to form a detection loop;

each detection module is used for putting a group of protection device outlet relay contacts to be detected into or withdrawing from the detection loop; each detection module comprises a selection switch and two binding posts; the selection switch is used for connecting or cutting out the two binding posts into the detection loop, and the two binding posts are used for connecting a group of outlet relay contacts of the protection device to be detected.

Furthermore, the signal output module is a relay protection tester, and two ends of the plurality of detection modules are connected with two ends of a switching value input channel of the relay protection tester respectively after being connected in series.

Furthermore, the signal output module is a display module; the display module comprises a power supply module and an indicator light; the voltage of the power supply module is matched with the indicator lamp and is connected with the current-limiting resistor in series according to the requirement; the power module, the indicator light and the detection modules are connected in series.

Furthermore, the power module and the indicator light are connected in series and then are connected in parallel with a loop self-checking switch for detecting whether the power module and the indicator light can work normally.

Furthermore, the power module, the indicator light, the power on-off switch and each detection module are sequentially connected in series.

Further, the signal output module comprises a relay protection tester and a display module; and the relay protection tester and the display module are selected to be connected into the detection loop through a selector switch.

Further, the selection switch is a single-pole double-throw switch.

Has the advantages that:

compared with the existing protection device, the utility model has the advantages that the efficiency of protection and calibration can be improved; the use times of the actual circuit breaker are reduced, and the service life of the circuit breaker is prolonged; the cost is low, and the method is economical and applicable; the direct purchase of the complete set of simulation circuit breakers needs to spend tens of thousands of yuan, and the design only needs hundreds of yuan, so that the purchase cost of the test equipment can be reduced, and the expenditure is greatly saved for enterprises. Besides, the method also has the following advantages:

1. reliable performance of equipment

The main equipment is designed in a loop without a relay and the like, and the action performance and the reliability of the main equipment are completely determined by the contact of the relay at the outlet of the protection device.

2. Maintenance costs are negligible

Because the main equipment is the maintenance of the loop wiring, the main equipment can be completely automatically responsible by a relay protection class of a power plant, and the inspection is not needed, so that the expense is reduced.

3. The outlet contact of each group of relays of the protection device can be directly tested.

4. Light in weight, small conveniently carries, reduces working strength.

Drawings

FIG. 1 is an external view of an embodiment of the present invention;

fig. 2 is a schematic diagram of an embodiment of the present invention.

Detailed Description

The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Example 1:

the embodiment discloses a protection device outlet relay contact action detection device, which comprises a signal output module and more than one detection module, wherein the signal output module and each detection module are connected in series to form a detection loop;

Example 2:

in this embodiment, on the basis of embodiment 1, a relay protection tester is further selected as a signal output module; after the detection modules are connected in series, two ends of each detection module are respectively connected with two ends of a switching value input channel of the relay protection tester.

Example 3:

in this embodiment, on the basis of embodiment 1, a display module is further selected as a signal output module; the power supply module and the indicator light are included; the power module, the indicator light and the detection modules are connected in series.

Example 4:

in this embodiment, on the basis of embodiment 3, a loop self-checking switch is further connected in parallel after the power module and the indicator light are connected in series, and is used for detecting whether the power module and the indicator light can work normally.

Example 5:

in this embodiment, on the basis of embodiment 3, a power switch is further disposed between the power module and the circuit formed by the indicating lamp string and the circuit formed by the detecting modules in series.

Example 6:

in this embodiment, on the basis of embodiment 1, a relay protection tester and a display module are further provided as a signal output module; selecting the relay protection tester or the display module to be connected into the detection loop through a selector switch; when the relay protection tester is selected to be connected into the detection loop, two ends of each detection module are connected with a switching value input channel of the relay protection tester after being connected in series; and when the display module is selected to be connected into the detection loop, the display module and each detection module are connected in series.

Example 7:

in this embodiment, a single-pole double-throw switch is further selected as the selection switch on the basis of embodiment 1.

Example 8:

in this embodiment, four detection modules are provided as an example for explanation on the basis of embodiment 7. The number of the detection modules can be sequentially expanded according to actual requirements (the number of the outlet relay contact groups of the protection device to be detected). The appearance design of the present embodiment is shown in fig. 1, and the specific wiring schematic diagram is shown in fig. 2.

This embodiment has designed two kinds of detection methods:

the first mode is a mode without a power supply, and the detection of the contact action of the outlet relay of the protection device to be detected is completed through the matching of a switching value input channel of the relay protection tester.

And the second mode is a power supply-provided mode, and the switching value input channel without the relay protection tester is matched through a power supply and an indicator lamp, so that the detection of the contact action of the outlet relay of the protection device to be detected is completed.

The working principle of the scheme is as follows:

the method comprises the steps of designing a detection device, taking 4 groups of outlet relay contacts corresponding to a protection device as an example, four groups of outlet relay contacts are respectively D L1, D L2, D L03 and D L14, setting an input command (the position of a selection switch) of the detection device according to the outlet trip matrix of the protection device, namely the tripping matrix of the protection device is 1001 (and the expected outputs are D L21, D L34 and D L2 and D L3 are not operated, namely the relay contacts are converted from an open state to a closed state), setting selection switches L P1, L P2, L P3 and L P4 in the detection device to be L P1 and L P3, setting the rest relays to be 0, simulating fault addition, if the outlet contacts of the protection device are correctly operated, outputting a signal to the detection device, namely a power supply protection device and displaying a correct relay contact lighting signal to an outlet protection device through a self-lighting protection device, and displaying a correct relay protection device outlet relay lamp protection device.

The utility model discloses also can directly test protection device's a certain group's export relay contact. When a certain group of outlet relay contacts are directly tested, the selector switch corresponding to the group of outlet relay contacts is set to be 1, other selector switches are set to be 0 (namely, the binding posts connected with the group of outlet relay contacts are connected into the detection loop, and the binding posts connected with other outlet relay contacts are cut into the detection loop), and the protection device is controlled to enable the group of outlet relay contacts to act, so that the signal judgment of the indicator light output by the detection device to the relay protection tester or the indicator light with the power supply loop (display module) can be observed, whether the group of outlet relay contacts act correctly or not, and whether the group of outlet relay contacts are normal or not can be observed.

The detection process comprises the following steps:

firstly, each group of relay contacts of the protection device to be detected are respectively led to a binding post (D L) corresponding to the detection device by two leads.

If the response time of each group of relay contact is required to be tested, the wiring of the wiring terminal is connected to the relay protection tester.

Determining an input instruction (position of a selector switch) of the detection device according to the tripping matrix logic of the protection device to be detected;

1. when used with relay protection tester

The method is that the mode without power supply is selected, at the moment, the change-over switch is turned to the right side, the change-over switch corresponding to the upper change-over switch in figure 2 (in the embodiment, a change-over switch of L W42A2-3142 series is selected) is switched to be communicated with ① and ②, the lower change-over switch is switched to be communicated with ⑦ and ⑧, at the moment, the detection device A and the detection device X are respectively connected with two ends of a switching value input channel of the relay protection tester, fault addition is simulated, the outlet relay contact of the protection device is operated, and if the outlet relay contact of the protection device is correctly operated, a signal is fed back to the relay.

2. When used alone

Namely, the method with the power supply is selected, and the steps are as follows:

1) firstly, a loop self-checking switch is closed, if a lamp is on, a power loop (a power module and an indicator lamp) is normal, and the voltage is normal; and opening the loop self-checking switch.

2) Turning on the left side of the switch, switching the switch to ③ and ④ corresponding to the upper switch in FIG. 2 to be communicated, switching the switch at the lower side to be communicated with ⑤ and ⑥, and turning on the power supply on-off switch.

3) And after the test is finished, the power supply on-off switch is switched off, and the change-over switch is switched on the middle side or the right side (in a non-charging mode).

Claims

1. The device for detecting the contact action of the outlet relay of the protection device is characterized by comprising a signal output module and more than one detection module, wherein the signal output module and each detection module are connected in series to form a detection loop;

2. The device for detecting the contact motion of an outlet relay of a protection device according to claim 1, wherein the signal output module is a relay protection tester; after the detection modules are connected in series, two ends of each detection module are respectively connected with two ends of a switching value input channel of the relay protection tester.

3. The device for detecting the contact motion of an outlet relay of a protection device according to claim 1, wherein the signal output module is a display module; the display module comprises a power supply module and an indicator light; the power module, the indicator light and the detection modules are connected in series.

4. The apparatus as claimed in claim 3, wherein the power module is connected in series with the indicator light and then connected in parallel with a loop self-test switch for testing whether the power module and the indicator light are working properly.

5. The device for detecting the contact motion of an outlet relay of a protection device according to claim 3, further comprising a power supply on-off switch; the power module, the indicator light, the power on-off switch and the detection modules are sequentially connected in series.

6. The device for detecting the contact motion of the outlet relay of the protection device according to claim 1, wherein the signal output module comprises a relay protection tester and a display module; and the relay protection tester and the display module are selected to be connected into the detection loop through a selector switch.

7. The device for detecting the contact motion of an outlet relay of a protection device as claimed in any one of claims 1 to 6, wherein the selection switch is a single-pole double-throw switch.