DH-1 type primary reclosing relayDetailed product description：

1 Purpose
Used in the control circuit for implementing three-phase primary reclosing on transmission lines.

Overview of Structure 2
This relay consists of a time relay (DS-112C type, as the time element JS), an electrical code relay (as the intermediate element JZ), and resistance and capacitance elements. They are fixed on an insulated mounting plate, which in turn is fixed on a metal base. The mounting plate is equipped with a metal shell, which is fastened to the base by screws. A dust isolation pad is attached between the shell and the base to ensure sealing. Glass is embedded on the upper part of the metal shell, allowing for inspection of the device's operation from the outside.
Relays can be wired before or after the board.
Internal wiring diagram of relay, Figure 1.



Figure 1 Internal wiring diagram of DH-1 relay (back view)

3 Technical data
3.1 The rated voltage of the relay is DCll0V, 220V.
3.2 The rated current of the relay (rated holding current of the intermediate component current winding JZ (1)) is 0.25A; 0.5A; 1A；2A； 4A。
3.3 At rated voltage, when the ambient temperature is 20 ± 5 ℃ and the relative humidity is not greater than 70%, the time for the capacitor to charge to the necessary voltage for the intermediate component (the interval time for one reclosing) is within the range of 15s-25s.
3.4 At 70% rated voltage, when the ambient temperature is 20 ± 5 ℃ and the relative humidity is not greater than 70%, the relay should ensure reliable operation. At this time, the time for the capacitor to charge to the voltage necessary for the intermediate components to operate can be extended to 2 minutes.
When there is no voltage in the intermediate component voltage winding and the current winding flows through the rated current, the armature remains in the engaged position.
After the intermediate component contacts JZl and JZ (I) of the relay are connected in series at rated voltage, it should be ensured that a current of 8 times the rated current (not greater than 8A) can be connected for 5 seconds, and there should be no traces of melting or adhesion on the contacts thereafter.
At rated voltage, the power consumption of the intermediate component current winding JZ (1) should not exceed 1.35W.
The delay adjustment range of the 3.8 time element is 0.25s to 3.5s.
The coil of the time element connected in series with an additional resistor should be able to withstand 110% of the rated voltage for a long time.
3.10 Dielectric strength: Each circuit of the relay should withstand a voltage of 2kV between the exposed non charged metal parts, and conduct an AC 50Hz test for 1 minute without breakdown or flashover.
The weight of the 3.11 device shall not exceed 5kg.
3.12 The external dimensions and opening dimensions are shown in Figure 2 and Figure 3.



Figure 2: Dimensions of DH-1 Relay


Figure 3: Hole size of DH-1 relay

The parameters of each component inside the 3.13 relay are given in Table 1.

wiring diagram code name	name			Rated voltage		remark
				110V	220V
ZJ(1) ZJ(V)	middle interval yuan document	Forehead fixed electricity flow (A)	zero point two five	Wl=1200 turns W2=8000 turns Φ=0.35，R=12.3ΩΦ=0.12，R=900Ω	Wl=1200 turns W2=12600 turns Φ=0.35，R=12.3ΩΦ=0.1，R=2100Ω	W1 is JZ(1) The number of turns W2 is Jz(V) The number of turns
			zero point five	Wl=600 turns W2=8000 turns Φ=0.49，R=3.2Ω Φ=0.12，R=900Ω	Wl=600 turns W2=12600 turns Φ=0.49，R=3.2ΩΦ=0.1，R=2100Ω
			one	Wl=300 turns W2=8000 turns Φ=0.69，R=0．8ΩΦ=0.12，R=900Ω	Wl=300 turns W2=12600 turns Φ=0.69，R=0．8ΩΦ=0.1，R=2100Ω
			two point five	Wl=300 turns W2=8000 turns Φ=1，R=0.2Ω Φ=0.12，R=900Ω	Wl=120 turns W2=12600 turns Φ=1，R=0.2Ω Φ=0．1，R=2100Ω
			four	W1=75 turns W2=8000 turns Φ=1.32，R=0.05ΩΦ=0.12，R=900Ω	W1=75 turns W2=12600 turns Φ=1.32，R=0.05ΩΦ=0.1，R=2100Ω
JS C 4R 5R 6R 17R	Time element capacitor resistor resistor resistor resistor			W=9800 turns, Φ=0.2, R=450 Ω CZM—L—250-10uf RT-0.5—2.2MΩ RXY-20—1KΩ RXY-15—500Ω RXY—20-1KΩ	W=17600 turns, Φ=0.13, R=1930 Ω CZM—L-630—4uf RT-0.5-6.8MΩ RXY-20—4KΩ RXY-15-500Ω RXY-20-3KΩ	two parallel connection two parallel connection

Rated current of circuit breaker closing contactor coil (A)	0.3-0.6	0.6-1.2	1.2-3	3-7.5
Rated current of relay (A)	zero point two five	zero point five	one	two point five

4 Ordering Instructions
Please indicate when placing an order
4.1 Name and model of relay.
4.2 The rated voltage of the operating circuit and the rated current of the intermediate component current winding JZ (I).
4.3 Wiring method (front or back).
When selecting the specifications for the device, the rated current of the intermediate component current winding JZ (I) should be less than the rated current of the circuit breaker closing contactor coil. Specific options can be selected according to Table 2.

DH-1 type primary reclosing relay（No image available）