CN101449172B - A detection device for a switch cabinet with an input terminal module - Google Patents

Abstract

A testing device for testing a switch cabinet (2), comprising an input terminal module (5) with a plurality of individual terminals (6, 7, 8) mounted on the switch cabinet (2). Each single terminal (6, 7, 8) includes: an input connection contact (9) for connecting a device (11) or an electrical connection wire (12) arranged outside the switch cabinet (2); The contact point (10) is used to connect the equipment (4) or the electrical connection wire (15) arranged inside the switch cabinet (2); the first terminal inspection contact connected to the input connection contact (9) point (18); connected to the second terminal inspection contact (19) on the cabinet connection contact (10); and one side is arranged on the input connection contact (9) and the first terminal inspection contact (18 ), and the other side is provided with a disconnect switch (20) between the cabinet connection contact (10) and the second terminal inspection contact (19).

Description

Test device for switchgear with input terminals

technical field

The invention relates to a testing device for a switch cabinet comprising an input terminal module mounted on the switch cabinet with a plurality of individual terminals.

Background technique

The reliability of the devices used in switchgear and/or power stations for monitoring and controlling electrical operating devices must be checked during commissioning and, if necessary, required maintenance. These devices can in particular be protective devices arranged in the switch cabinet.

Currently, test switches or test modules are used, by means of which the test device can be connected to the device arranged in the switch cabinet and to be tested. These test switches or test modules are connected to the circuit inside the switch cabinet by means of special wiring. The test switches or test modules and their connecting wiring constitute additional expenditure. Furthermore, it is only possible to test the electrical circuits inside the switch cabinet as well as the tools starting from the point at which the test switch or the test module is connected.

Contents of the invention

The technical problem underlying the present invention is therefore to provide a testing device of the type mentioned at the outset, which enables the most comprehensive testing of switchgear cabinets to be carried out at a very low cost.

The above technical problem is solved by the features of independent claim 1 . Each individual terminal of the input terminal module of the testing device according to the invention comprises:

a) Input connection contacts for connecting equipment or electrical connection wires arranged outside the switch cabinet,

b) cabinet connection contacts, used to connect equipment or electrical connection wires arranged inside the switch cabinet,

c) a first terminal test contact connected to said input connection contact,

d) a second terminal test contact, connected to said cabinet connection contact, and

e) A disconnect switch, which is arranged between the input connection contact and the first terminal inspection contact on one side, and between the cabinet connection contact and the second terminal inspection contact on the other side.

The test device according to the invention is characterized in that the input terminal module allows both the connection of components inside and outside the cabinet required during normal operation, such as protective equipment, measuring transformers, tripping coils, etc., and the connection of test equipment . That is to say, the input terminal has a double function. Additional outlay for separate devices (for example test switches or test modules) and for additional wiring is omitted, so that the test device according to the invention can be produced inexpensively. Furthermore, a complete inspection of the cabinet contents is permitted, since the decisive terminal inspection contacts, to which the inspection device can be connected, are located directly on the electrical inputs of the switch cabinet. Therefore, all circuits and all devices inside the switchgear were sampled and checked for faults.

Preferred embodiments of the testing device according to the invention are given by the features of the subclaims of claim 1 .

A variant is advantageous if the disconnect switch is closed in the base state. This closed basic state is then precisely designed for normal operating situations. Intervention by opening the disconnect switch is only necessary during the test run.

Furthermore, it is advantageous if the disconnect switch can be actuated mechanically. This is extremely reliable and durable. There is also no dependence on the applied electrical supply voltage.

According to another preferred variant, a test plug is provided which can be plugged into the input terminal module and, in the inserted state, puts the input terminal module in a test state. This allows a particularly simple and reliable connection of the testing device to the input terminal.

Furthermore, it is preferred that the test plug is designed for mechanically actuating the disconnect switch and for mechanically and electrically contacting the first and second terminal test contacts. In this way, the test plug fulfills several functions at the same time.

Furthermore, it is advantageous if at least one individual terminal is designed as a circuit breaker terminal for connecting a circuit breaker, and the test plug is designed such that when the test plug is plugged into the input terminal module, the The disconnect switch at the breaker terminal is opened first. As a result, false tripping of the circuit breaker is reliably prevented if the switch cabinet is connected to the test device by means of the test plug for testing purposes.

If at least two individual terminals are designed as current transformer terminals for connecting current transformers, it is also advantageous to configure the test plug in such a way that when the test plug is plugged onto the input terminal module, the After the disconnect switch of the circuit breaker terminal is opened, the first terminal test contact of the current transformer terminal is short-circuited. This prevents undesired damage to the current transformer due to disconnection of the electrical circuit connected to the current transformer.

Furthermore, it is advantageous if the test plug is designed such that when the test plug is plugged into the input terminal module, after the disconnect switch of the circuit breaker terminal is opened and after the current mutual inductance After the first terminal test contact of the device terminal is short-circuited, all disconnectors that are still closed are opened. This switching sequence prevents undesired influences on operating devices connected outside the switch cabinet and allows a reliable transition to test operation.

Furthermore, in an advantageous variant, the input terminal module is arranged on the front side of the switch cabinet. This improves accessibility and makes it easier to verify device connections. In particular, the input terminals, which are usually arranged on the rear of the switch cabinet, can be arranged on the front side with a swivel frame next to the switch cabinet. In typical embodiments of switchgear cabinets and rotary frames, there are free spaces on the side next to the rotary frame, for example up to 30 cm wide, for accommodating input terminal modules.

Description of drawings

Further features, advantages and details of the invention emerge from the following description of preferred embodiments with the aid of the drawings. In the attached picture:

FIG. 1 shows an exemplary embodiment of a testing device with a switch cabinet including an input terminal module, a pluggable testing plug and a testing device,

Figure 2 shows an embodiment of a switchgear with an input terminal module with a test function, and

FIG. 3 shows an exemplary embodiment of a test plug that can be plugged onto an input terminal module of the switch cabinet according to FIG. 2 and a test device that can be connected thereto.

Mutually corresponding parts are indicated with the same reference numerals in FIGS. 1 to 3 .

Detailed ways

FIG. 1 shows a schematic diagram of an exemplary embodiment of a testing device 1 . The testing device 1 is used for testing a switch cabinet 2 in which at least one protective device 4 is arranged for monitoring a power supply network 3 . Furthermore, the switch cabinet 2 also contains an input terminal module 5 .

The input terminal module 5 has a plurality of individual terminals, some of which are designed as current transformer terminals 6 and 7 and another part as circuit breaker terminal 8 in the exemplary embodiment according to FIG. 1 . Each of these individual terminals has an input connection contact 9 and a cabinet connection contact 10 as main contacts, which are each embodied as screw contacts.

The input connection contacts 9 of the current transformer terminals 6 are connected to a current transformer 11 arranged outside the switch cabinet 2 , which detects the current in the electrical lines L1 , L2 and L3 of the power supply network 3 . The input connection contact 9 of the current transformer terminal 7 is connected to an external neutral point connection (Sternpunktbeschaltung) 12 . In principle, instead of this neutral point connection 12 , a series connection to another monitoring or control device (for example to a protective device arranged in another switch cabinet) is also possible. The input connection contact 9 of the circuit breaker terminal 8 is connected to a trip coil 13 of a circuit breaker 14 which is likewise arranged outside the switch cabinet 2 .

Inside the cabinet, the single-terminal cabinet connection contacts 10 are connected to known protective devices 4 by means of cabinet wiring 15 .

The input terminal module 5 has a dual function. It fulfills the verification function in addition to connecting the components described above which are required for proper operation. That is to say, it is also a component of the testing device 1 , which also includes a testing plug 16 which can be plugged into the input terminal module 5 and a testing device 17 which can be connected to the testing plug 16 .

Each single terminal also includes: a terminal test contact 18 on the input side in the form of a socket contact, a terminal test contact 19 on the cabinet side also in the form of a socket contact, and a mechanically operable The disconnect switch 20 is arranged between the input connection contact 9 and the cabinet connection contact 10 . The input connection contacts 9 are respectively connected to the terminal inspection contacts 18 on the input side corresponding to the individual terminals, and the cabinet connection contacts 10 are respectively connected to the terminal inspection contacts 19 on the cabinet side corresponding to the individual terminals. The input connection contact 9 and the terminal inspection contact 18 of a single terminal are electrically connected in parallel, and the cabinet connection contact 10 and the terminal inspection contact 19 of a single terminal are also electrically connected in parallel.

The test plug 16 has input-side plug contacts 21 and cabinet-side plug contacts 22 respectively in the form of contact pins, which, in the inserted state, engage with the terminal test contacts 18 on the input side and in the cabinet. One side engages with the terminal verification contacts 19 so as to respectively establish electrical contact.

In the following, the mode of operation when the test plug 16 is plugged into the input terminal module 5 will be described.

The test plug 16 can be detachably plugged into the input terminal module 5 . The insertion direction is indicated by the direction arrow 23 in FIG. 1 .

The test plug 16 is designed in such a way that it first opens the disconnector 20 of the circuit breaker terminal 8 during insertion, then short-circuits the current transformer terminals 6 and 7 on the input side, and finally opens the until then closed Disconnect switch 20. In the short-circuit connection performed in the second step, the terminal test contacts 18 on the input side and thus finally the current transformer 11 are connected in the same way as inside the switch cabinet 2 . Corresponding wiring is provided in the test plug 16 between the input-side plug contacts 21 . Similarly, the wiring of the cabinet-side plug contacts 22 provided in the test plug 16 , in conjunction with the connected test device 17 , simulates the external, ie input-side, connection of the input terminal module 5 .

The three mentioned switching and contacting sequences are important. This ensures that the circuit breaker 14 cannot inadvertently receive a switching command during insertion of the test plug 16 . Furthermore, the short-circuit connection made in the second step ensures that the circuit to which the current transformer 11 is connected is not interrupted at any time. Otherwise, the current transformer 11 may be damaged. The final separation of the input side from the cabinet side does not take place until the third step, for the duration of the test or as long as the test plug 16 remains plugged in.

FIG. 2 shows another exemplary embodiment of a switchgear cabinet 24 with an input terminal module 25 , which also has a test function. In turn, a protective device 26 is arranged in the switching cabinet 24 , which is connected to the cabinet connection contacts 10 of the input terminal module 25 . Furthermore, the input terminal module 25 is also connected on the input side to the current transformer 11 which is not further shown in FIG. shown on the voltage transformer.

Like the input terminal module 5 according to FIG. 1 , the input terminal module 25 has a total of eight current transformer terminals 6 and 7 . However, it has four circuit breaker terminals 8 and also four voltage transformer terminals 27 . Furthermore, in the exemplary embodiment according to FIG. 2 four further unused reserved terminals 28 are provided which can be used for warning purposes. Otherwise, the structure and mode of operation of the input terminal module 25 are similar to those of the input terminal module 5 . An input-side terminal test contact 18 , a cabinet-side terminal test contact 19 and a disconnect switch 20 are likewise provided for each individual terminal.

FIG. 3 shows an exemplary embodiment of a test plug 29 that can be plugged onto the input terminal module 25 and a test device 30 that can be connected thereto. Together with the input terminal module 25 , they form a testing device for the switch cabinet 24 according to FIG. 2 . The test plug 29 cooperates with the input terminal module 25 exactly as described in connection with FIG. 1 . First, the disconnector 20 of the circuit breaker terminal 8 is opened, then the current transformer terminals 6 and 7 are short-circuited on the input side, and finally the disconnector 20 , which was closed until then, is opened. Since the voltage transformers can also be operated without any problems without load, in the test plug 29, unlike for the current transformers, there is no reflection between the input-side plug contacts 21 for the voltage transformers. Wiring of internal connections.

The input terminal modules 5 and 25 allow a complete inspection of all components arranged inside the switchgear 2 and 24 , including the cabinet wiring 15 and the components of the protective device 4 or 26 . Due to their dual function, additional inspection components which would otherwise be required can be omitted. This also eliminates the wiring outlay for these additional test components.

list of reference signs

1 Inspection device

2 switchgear

3 Power supply network

4 Protection equipment

5 input terminal module

6, 7 Current transformer terminals

8 circuit breaker terminals

9 input connection contacts

10 cabinet connection contacts

11 Current transformer

12 External neutral connection

13 Trip coil

14 circuit breaker

15 cabinet wiring

16 Inspection plug

17 Inspection equipment

18 Terminal inspection contacts on the input side

19 Terminal inspection contacts on the side of the cabinet

20 Separate switch

21 Plug contacts on the input side

22 Plug contacts on cabinet side

23 Direction arrow for insertion direction

24 switchgear

25 input terminal module

26 Protective equipment

27 Potential transformer terminals

28 reserved terminal

29 Inspection plug

30 Inspection equipment

Claims (6)

1. A testing device for a switchgear (2; 24), comprising a plurality of individual terminals (6, 7, 8; 27, 28) installed on said switchgear (2; 24) An input terminal module (5; 25), wherein each individual terminal (6, 7, 8; 27, 28) comprises: a) input connection contacts (9) for connecting devices (11) or electrical connection wires (12) arranged outside the switchgear (2; 24), b) cabinet connection contacts (10) for connecting equipment (4; 26) or electrical connection wires (15) arranged inside the switch cabinet (2; 24), c) a first terminal test contact (18), connected to said input connection contact (9), d) a second terminal test contact (19), connected to said cabinet connection contact (10), and e) Disconnect switch (20), one side is set between the input connection contact (9) and the first terminal inspection contact (18), and the other side is set between the cabinet connection contact (10) and the second terminal between the test contacts (19), Therein, a test plug (16; 29) is provided, which can be inserted into the input terminal module (5; 25) and puts the input terminal module (5; 25) in a test state in the inserted state, and among them, At least one single terminal is configured as a circuit breaker terminal (8) for connection to a circuit breaker (14), and the test plug (16; 29) is designed such that when the test plug (16; 29) is plugged into the When the input terminal module (5; 25) is on, the disconnect switch (20) of the circuit breaker terminal (8) is first turned off, and At least two individual terminals are configured as current transformer terminals (6, 7) for connecting a current transformer (11), and after plugging the test plug (16; 29) in the input terminal module (5; 25) when on, after the disconnect switch (20) of the circuit breaker terminal (8) is disconnected, the first terminal inspection contact (18) of the current transformer terminal (6, 7) is short-circuited, The first terminal test contact (18) is connected in the same way as inside the switch cabinet (2), for which purpose the plug contact ( 21) Corresponding wiring is provided between. 2. The testing device according to claim 1, characterized in that the disconnect switch (20) is closed in the basic state. 3. The testing device as claimed in claim 1, characterized in that the disconnect switch (20) can be operated mechanically. 4. The test device according to claim 1, characterized in that the test plug (16; 29) is designed for mechanically operating the disconnect switch (20) and for mechanically and electrically contacting the first One and second terminal test contacts (18, 19). 5. The inspection device according to claim 1, characterized in that, the inspection plug is designed to: when the inspection plug (16; 29) is inserted on the input terminal module (5; 25), After the disconnect switch (20) of the circuit breaker terminal (8) is opened and after the first terminal test contact (18) of the current transformer terminals (6, 7) is short-circuited, all other Closed disconnect switch (20). 6. The inspection device according to claim 1, characterized in that the input terminal module (5; 25) is arranged on the front of the switchgear (2; 24).

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