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PBG series explosion-proof high-voltage vacuum power distribution device

PBG series explosion-proof high-voltage vacuum power distribution device for mining for mining is mainly used in the coal mine with explosive hazardous gas (methane mixture) for control, protection and measurement of the power supply system with three-phase AC neutral point not directly grounded with rated voltage of 10KV and 6KV, rated frequency of 50Hz, rated current to 630A. The device is provided with insulation monitoring, high-voltage electric leakage, overload, phase failure, under-voltage, overvoltage, overvoltage absorption and other protection functions; it has wind electricity blocking and gas blocking power-off functions; it has the simulated failure test function. It is especially suitable for distribution switch in the central or mining area substation. It can also be used to directly control the high-voltage motor.

Technical parameters
Product advantage
Product features

1.Rated parameters of the complete vehicle

2.Rated operating voltage: 10KV, 6KV

3.Rated current: 6KV: 50A, 100A, 200A, 315A, 400A, 500A, 630A

10KV: 50A, 100A, 200A, 315A, 400A, 500A, 630A

4. Rated frequency: 50Hz

5.Rated short-circuit breaking current 12.5KA (effective value)

6. Rated short-circuit making current 31.5KA (peak value)

7.Rated dynamic stability current (rated peak withstand current) 31.5KA (peak value)

8.Rated thermal stability current (rated short-time withstand current) 12.5KA (effective value)

9. The rated thermal stability (short-term withstand) time is not less than 2s

10.The breaking frequency of the rated short-circuit breaking current is 30 times. For operation sequence, see Table 1

Table 1

Serial No.	Short-circuit breaking current Percentage %	Operation sequence	Test Frequency
1	10	Break-180s- make-break -180s- make-break	1
2	30	Break-180s- make-break -180s- make-break	1
3	60	Break-180s- make-break -180s- make-break	1
4	100	Break-180s- make-break -180s- make-break	2
5	100	Branch plant	13
6	100	Make-break	11

11. Rated voltage of the closing and opening device: DC100V

12. For rated insulation level, see Table 2 Table 2

Rated voltage	Short-time (1min) industrial frequency withstand voltage value (effective value) KW				Remarks
	Phase-to-ground, phase-to-phase, circuit breaker	Between open contacts of the isolating switch	Secondary circuit to ground		Secondary circuit withstand voltage shall be disconnected, various instrument and display device
6	30	34	2
10	42	48	2
Rated full wave lightning impulse withstand voltage (peak value) KV
To-ground, phase-to-phase, circuit breaker fracture				Isolating switch fracture
60				70
75				85

13. For voltage class, electrical clearance and creepage distance, see Table 3

Table 3

Rated voltage V	Minimum electric clearance mm	Minimum creepage distance mm
100	2.5	4
6000	60	100
10000	100	160

14.For main technical parameters of the circuit breaker, see Table 4

Table 4

Item Name	Parameters	Unit
Item Name	ZNT-10/630-12.5	Unit
Contact break distance	9±1	mm
Contact over travel	3+1	mm
Contact closing bounce	≤3	ms
Three-phase different period	≤1	ms
Average closing speed	0.6-1.3	m/s
Average opening speed	0.8-1.5	m/s
Main circuit resistance	≤120	uΩ
Contact pressure	≥930	N
Mechanical life	10000	Time
Related parameters of the permanent magnet mechanism and controller

15. The supporting JSZW3-6, 10 voltage transformer is three-phase five-column type. The basic technical parameters are shown in Table 5

Table 5

Model	Rated voltage (V)			Accuracy class and corresponding rated load (VA)				Limit output (VA)
Model	Primary Winding	Secondary Winding	Residual winding	0.5	1	3	6P/3P	Limit output (VA)
JSZW3—6	6000	100/	100/3	120	150	300	120	600
JSZW3—10	10000	100/	100/3	150	240	300	120	600

16.The supporting LMZ-6, 10 double-pole current transformer is divided into the signal source and current source winding.

The current source winding satisfies requirements in Table 6

Table 6

Rated primary current (A)

Rated secondary current (A)

Rated load (VA)

Accuracy class

Accurate limit value coefficient

3.75

100, 200, 315

400, 500, 630

3.75

The maximum output power of the current source winding shall not be less than 25VA, that is to say, when the primary passes through over 4 times of the rated current, and the secondary is connected with 25Ω (COSΦ=1) load, the secondary current shall not be less than 1A.

17. The equipped PBG-113 high-voltage switch integrated protection has electric leakage, overload, short circuit, insulation monitoring and other protection functions, and the specific indicators are as follows:

18. Current protection element

1) Current fixed value: 0.2In to 10 In;

2) Delay fixed value: 0.01 to 20S;

3) Fixed value error: not exceeding ±5%.

19. Electric leakage current protection element

1) Current fixed value: 0.1A to 10A;

2) Delay fixed value: 0.01 to 20S;

3) Fixed value error: not exceeding ±5%.

20. Overvoltage (undervoltage) protection element

1) Voltage fixed value: 2 to 150V;

2) Delay fixed value: 0.01 to 20S;

3) Fixed value error: not exceeding ±5%.

21.Double shielded cable monitoring and protection element

1) When the insulation resistance value Rd between the shielding core wire and the shielding ground wire of the double shielded cable is reduced to: Rd<3KΩ, protection reliably acts; when Rd>5.5KΩ, protection does not reliably act.

2) When the loop resistance value Rk between the shielding core wire and the shielding ground wire of the double shielded cable is reduced to: Rk>1.5KΩ, protection reliably acts; when Rd<0.8KΩ, protection does not reliably act.

3) Action time: <100ms.

22. Inverse time limit protection

The allowed overcurrent negotiating time of most protected elements and the current value are of inverse relation, i.e., the larger the current value is, and the shorter the allowed negotiating time is. The inverse time limit over-current protection is similar to many load failure characteristics in principle. Therefore, it has more superior protection performance than definite time current protection on many occasions. Inverse time over-current protection has the snap-action and inverse time limit characteristics. Three inverse time limit characteristic curves are designed in the protector, so as to satisfy requirements for application on different occasions.

23.Action time accuracy

1) When time delay is 0 to 2s, action error shall not exceed ±0.05s;

2) When time delay is 2 to 20s, action error shall not exceed ±5%;

24. Communication interface

An RS485 remote intrinsically safe communication interface (labeled as system on the protector panel). The communication protocol is the standard protocol of the power industry, and the communication rate can be set; it can be networked with KJF81 monitoring substation, realizing four remote functions of the high-explosive switch.

Another RS-485 communication interface (labeled as display on the protector panel) is used for communication with the monitor, realizing local data display function.

Good explosion-proof performance, advanced technologies, stable and reliable protection performance, compact structure, easy for maintenance and overhaul. The intelligent multi-functional integrated protector with advanced technologies is selected for the power distribution device, which has reliable and sensitive protection and high measurement accuracy. Combining the Chinese menu human-computer interaction, the display information is rich, and operation is simple and intuitive.
1. Appearance structure (Appearance structure I)

(1) The power distribution device consists of the underframe and the rectangular explosion-proof shell. The explosion-proof shell consists of the main chamber, box door, rear cover (two) and rear wiring chamber. The explosion-proof shell has the rectangular solid structure. It is divided into the front and rear chambers with a partition board in the middle, which are the independent explosion-proof parts.

(2) Six male pin stationary contact blocks and two seven-core terminals are installed on the intermediate diaphragm. The illuminating lamp is installed at the upper left corner of the division board. The rear chamber is the wiring chamber, which is divided into upper and lower chambers (the intermediate insulating baffle does not have the explosion-proof function). The upper chamber is the power incoming line. The lower chamber is load outgoing line, the outlet of the high-voltage cable of the lower chamber is installed with a zero sequence current transformer, and a compression nut is arranged at the left and right plates respectively (the user can lead out the control line, realizing remote control).

(3) The handcart type high-voltage vacuum circuit breaker and ancillary operating mechanism are installed in the main chamber. The handcart high-voltage vacuum circuit breaker consists of the vacuum circuit breaker, trolley, three-phase five-column voltage transformer, bus cross-core current transformer, microcomputer comprehensive protection device, piezoresistance, isolating male pin moving contact and so on. The electrical components are installed on the trolley. In case of any failure of the core, the trolley can be pulled out of the box, so as to facilitate maintenance or replace the spare machine core. The microcomputer comprehensive protection device has overload, short circuit, electric leakage, cable insulation monitoring and other protection functions; it has the current and voltage display functions; it has the failure type text representation function.

(4) The shall has the live knot bolt pressure plate type quick door opening structure, and has the reliable mechanical locking device: (a) The mechanical locking device with load isolation is arranged at the right axle head of the main shaft of circuit breaker closing and the track cover (see Attached drawing II). When the isolating male pin is at the closed state, and the vacuum circuit breaker is closed, the locking mechanism acts, and the isolating male pin cannot be pulled out. (b) The power distribution device is also arranged with the locking mechanism of door opening and isolating male pin opening and closing linkage (see Attached drawing III). When the box door is opened, power off the vacuum circuit breaker to release locking (see attached drawing II), and the isolating male pin is pulled open. At the same time, it is allowed to insert the locking lever in the axle sleeve on the isolating mechanism, and the locking lever is unscrewed out of the box door bolt hole. Meanwhile, insert it in the axle sleeve of the isolating mechanism, and the isolating male pin cannot be connected. When it is required to connect the isolating male pin, screw the locking lever in the front door bolt hole, the isolating mechanism axle sleeve is not restricted, the isolating male pin can be inserted, but the box door cannot be opened. That is to say: after the isolating male pin is opened in place, screw the locking lever out of the front door bolt hole, and the box door can be opened; after the box door is opened, the isolating male pin cannot be closed; after the isolating male pin is closed in place, the vacuum circuit breaker can be closed; the isolating male pin cannot be opened or closed with load. The propulsion mechanism installed at the right of the main chamber is to promote the circuit breaker trolley forward and backward, and realize closing and opening of the isolating male pin. There is a cover, track and extended track on the main chamber floor, which is used for circuit breaker trolley travel. The manual closing axle and manual tripping handle of the circuit breaker are also arranged at the right side of the main chamber. There is an observation window at the left and right sides at the rear of the main chamber respectively, and one can see opening and closing status of the isolating male pin.

2. Device on the door

There are electrical energy display, Chinese character display and opening and closing display convenient for observation on the box door. Seven buttons of lighting, start, stop, electric leakage, displacement, confirm and resetting are also arranged.

3. Wiring scheme of the main circuit

There are four kinds of main circuit wiring schemes of the power distribution device according to the function in the system:

Type A: see Figure 1 for the primary wiring scheme. There are two power incoming ends, and the power distribution device can be used separately and in a combined way.

Type B: see Figure 2 for the primary wiring scheme. There is a power incoming end, and the other end is connected with the long sleeve. That is to say, the power supply side is single loop feed in, and the load side is single loop feed out. The power distribution device can be used separately and in a combined way.

Type C: see Figure 3 for the primary wiring scheme. There is a power incoming side, and the other end is sealed with the end cover, i.e., single loop feed in and single loop feed out. The power distribution device can be used separately or as the main switch, and can also be used in a combined way.

Type D: see Figure 4 for the primary wiring scheme. The primary wiring scheme has no incoming end, and the three-phase power is directly connected with the wiring terminal of the switch from the cable line of the adjacent switch. When multiple power distribution devices are combined for use in the chamber,the power distribution device is only taken as the branch switch. It cannot be used separately, and can only be used in a combined way.

The cable head in Scheme A, B and C above can only be armored, and can be rubber-sheathed cable head. It shall be indicated during order by the user. If there is no instruction, it shall be equipped with the armored cable head.